always enable qr scanner plugin
[electrum-nvc.git] / gui / qt / main_window.py
index 5405210..874b8e2 100644 (file)
@@ -35,18 +35,17 @@ from electrum.plugins import run_hook
 
 import icons_rc
 
-from electrum.wallet import format_satoshis
+from electrum.util import format_satoshis
 from electrum import Transaction
 from electrum import mnemonic
 from electrum import util, bitcoin, commands, Interface, Wallet
 from electrum import SimpleConfig, Wallet, WalletStorage
+from electrum import Imported_Wallet
 
-
-from electrum import bmp, pyqrnative
-
-from amountedit import AmountEdit
+from amountedit import AmountEdit, BTCAmountEdit, MyLineEdit
 from network_dialog import NetworkDialog
-from qrcodewidget import QRCodeWidget
+from qrcodewidget import QRCodeWidget, QRDialog
+from qrtextedit import QRTextEdit
 
 from decimal import Decimal
 
@@ -63,14 +62,29 @@ elif platform.system() == 'Darwin':
 else:
     MONOSPACE_FONT = 'monospace'
 
-from electrum import ELECTRUM_VERSION
-import re
 
-from util import *
 
+# status of payment requests
+PR_UNPAID  = 0
+PR_EXPIRED = 1
+PR_SENT    = 2     # sent but not propagated
+PR_PAID    = 3     # send and propagated
+PR_ERROR   = 4     # could not parse
+
+
+from electrum import ELECTRUM_VERSION
+import re
 
+from util import MyTreeWidget, HelpButton, EnterButton, line_dialog, text_dialog, ok_cancel_buttons, close_button, WaitingDialog
 
 
+def format_status(x):
+    if x == PR_UNPAID:
+        return _('Unpaid')
+    elif x == PR_PAID:
+        return _('Paid')
+    elif x == PR_EXPIRED:
+        return _('Expired')
 
 
 class StatusBarButton(QPushButton):
@@ -99,54 +113,28 @@ class StatusBarButton(QPushButton):
 default_column_widths = { "history":[40,140,350,140], "contacts":[350,330], "receive": [370,200,130] }
 
 class ElectrumWindow(QMainWindow):
-    def build_menu(self):
-        m = QMenu()
-        m.addAction(_("Show/Hide"), self.show_or_hide)
-        m.addSeparator()
-        m.addAction(_("Exit Electrum"), self.close)
-        self.tray.setContextMenu(m)
-
-    def show_or_hide(self):
-        self.tray_activated(QSystemTrayIcon.DoubleClick)
-
-    def tray_activated(self, reason):
-        if reason == QSystemTrayIcon.DoubleClick:
-            if self.isMinimized() or self.isHidden():
-                self.show()
-            else:
-                self.hide()
 
-    def __init__(self, config, network):
+
+
+    def __init__(self, config, network, gui_object):
         QMainWindow.__init__(self)
 
         self.config = config
         self.network = network
-
-        self._close_electrum = False
+        self.gui_object = gui_object
+        self.tray = gui_object.tray
+        self.go_lite = gui_object.go_lite
         self.lite = None
 
-        if sys.platform == 'darwin':
-          self.icon = QIcon(":icons/electrum_dark_icon.png")
-          #self.icon = QIcon(":icons/lock.png")
-        else:
-          self.icon = QIcon(':icons/electrum_light_icon.png')
-
-        self.tray = QSystemTrayIcon(self.icon, self)
-        self.tray.setToolTip('Electrum')
-        self.tray.activated.connect(self.tray_activated)
-
-        self.build_menu()
-        self.tray.show()
         self.create_status_bar()
-
         self.need_update = threading.Event()
 
-        self.decimal_point = config.get('decimal_point', 8)
+        self.decimal_point = config.get('decimal_point', 5)
         self.num_zeros     = int(config.get('num_zeros',0))
+        self.invoices      = {}
 
         set_language(config.get('language'))
 
-        self.funds_error = False
         self.completions = QStringListModel()
 
         self.tabs = tabs = QTabWidget(self)
@@ -154,7 +142,9 @@ class ElectrumWindow(QMainWindow):
         tabs.addTab(self.create_history_tab(), _('History') )
         tabs.addTab(self.create_send_tab(), _('Send') )
         tabs.addTab(self.create_receive_tab(), _('Receive') )
+        tabs.addTab(self.create_addresses_tab(), _('Addresses') )
         tabs.addTab(self.create_contacts_tab(), _('Contacts') )
+        tabs.addTab(self.create_invoices_tab(), _('Invoices') )
         tabs.addTab(self.create_console_tab(), _('Console') )
         tabs.setMinimumSize(600, 400)
         tabs.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding)
@@ -162,6 +152,8 @@ class ElectrumWindow(QMainWindow):
 
         g = self.config.get("winpos-qt",[100, 100, 840, 400])
         self.setGeometry(g[0], g[1], g[2], g[3])
+        if self.config.get("is_maximized"):
+            self.showMaximized()
 
         self.setWindowIcon(QIcon(":icons/electrum.png"))
         self.init_menubar()
@@ -178,6 +170,8 @@ class ElectrumWindow(QMainWindow):
         self.connect(self, QtCore.SIGNAL('update_status'), self.update_status)
         self.connect(self, QtCore.SIGNAL('banner_signal'), lambda: self.console.showMessage(self.network.banner) )
         self.connect(self, QtCore.SIGNAL('transaction_signal'), lambda: self.notify_transactions() )
+        self.connect(self, QtCore.SIGNAL('payment_request_ok'), self.payment_request_ok)
+        self.connect(self, QtCore.SIGNAL('payment_request_error'), self.payment_request_error)
 
         self.history_list.setFocus(True)
 
@@ -193,57 +187,7 @@ class ElectrumWindow(QMainWindow):
             self.console.showMessage(self.network.banner)
 
         self.wallet = None
-        self.init_lite()
-
-
-    def go_full(self):
-        self.config.set_key('lite_mode', False, True)
-        self.mini.hide()
-        self.show()
-
-    def go_lite(self):
-        self.config.set_key('lite_mode', True, True)
-        self.hide()
-        self.mini.show()
-
-
-    def init_lite(self):
-        import lite_window
-        if not self.check_qt_version():
-            if self.config.get('lite_mode') is True:
-                msg = "Electrum was unable to load the 'Lite GUI' because it needs Qt version >= 4.7.\nChanging your config to use the 'Classic' GUI"
-                QMessageBox.warning(None, "Could not start Lite GUI.", msg)
-                self.config.set_key('lite_mode', False, True)
-                sys.exit(0)
-            self.mini = None
-            self.show()
-            return
-
-        actuator = lite_window.MiniActuator(self)
-
-        # Should probably not modify the current path but instead
-        # change the behaviour of rsrc(...)
-        old_path = QDir.currentPath()
-        actuator.load_theme()
-
-        self.mini = lite_window.MiniWindow(actuator, self.go_full, self.config)
-
-        driver = lite_window.MiniDriver(self, self.mini)
-
-        # Reset path back to original value now that loading the GUI
-        # is completed.
-        QDir.setCurrent(old_path)
-
-        if self.config.get('lite_mode') is True:
-            self.go_lite()
-        else:
-            self.go_full()
-
-
-    def check_qt_version(self):
-        qtVersion = qVersion()
-        return int(qtVersion[0]) >= 4 and int(qtVersion[2]) >= 7
-
+        self.payment_request = None
 
     def update_account_selector(self):
         # account selector
@@ -259,10 +203,13 @@ class ElectrumWindow(QMainWindow):
 
     def load_wallet(self, wallet):
         import electrum
+
         self.wallet = wallet
+        self.update_wallet_format()
+
+        self.invoices = self.wallet.storage.get('invoices', {})
         self.accounts_expanded = self.wallet.storage.get('accounts_expanded',{})
         self.current_account = self.wallet.storage.get("current_account", None)
-
         title = 'Electrum ' + self.wallet.electrum_version + '  -  ' + self.wallet.storage.path
         if self.wallet.is_watching_only(): title += ' [%s]' % (_('watching only'))
         self.setWindowTitle( title )
@@ -270,14 +217,33 @@ class ElectrumWindow(QMainWindow):
         # Once GUI has been initialized check if we want to announce something since the callback has been called before the GUI was initialized
         self.notify_transactions()
         self.update_account_selector()
-        self.new_account.setEnabled(self.wallet.seed_version>4)
+        # update menus
+        self.new_account_menu.setEnabled(self.wallet.can_create_accounts())
+        self.private_keys_menu.setEnabled(not self.wallet.is_watching_only())
+        self.password_menu.setEnabled(not self.wallet.is_watching_only())
+        self.seed_menu.setEnabled(self.wallet.has_seed())
+        self.mpk_menu.setEnabled(self.wallet.is_deterministic())
+        self.import_menu.setEnabled(self.wallet.can_import())
+
         self.update_lock_icon()
         self.update_buttons_on_seed()
         self.update_console()
 
+        self.clear_receive_tab()
+        self.update_receive_tab()
         run_hook('load_wallet', wallet)
 
 
+    def update_wallet_format(self):
+        # convert old-format imported keys
+        if self.wallet.imported_keys:
+            password = self.password_dialog(_("Please enter your password in order to update imported keys"))
+            try:
+                self.wallet.convert_imported_keys(password)
+            except:
+                self.show_message("error")
+
+
     def open_wallet(self):
         wallet_folder = self.wallet.storage.path
         filename = unicode( QFileDialog.getOpenFileName(self, "Select your wallet file", wallet_folder) )
@@ -320,18 +286,26 @@ class ElectrumWindow(QMainWindow):
         import installwizard
 
         wallet_folder = os.path.dirname(self.wallet.storage.path)
-        filename = unicode( QFileDialog.getSaveFileName(self, _('Enter a new file name'), wallet_folder) )
+        i = 1
+        while True:
+            filename = "wallet_%d"%i
+            if filename in os.listdir(wallet_folder):
+                i += 1
+            else:
+                break
+
+        filename = line_dialog(self, _('New Wallet'), _('Enter file name') + ':', _('OK'), filename)
         if not filename:
             return
-        filename = os.path.join(wallet_folder, filename)
 
-        storage = WalletStorage({'wallet_path': filename})
+        full_path = os.path.join(wallet_folder, filename)
+        storage = WalletStorage({'wallet_path': full_path})
         if storage.file_exists:
             QMessageBox.critical(None, "Error", _("File exists"))
             return
 
         wizard = installwizard.InstallWizard(self.config, self.network, storage)
-        wallet = wizard.run()
+        wallet = wizard.run('new')
         if wallet:
             self.load_wallet(wallet)
 
@@ -341,111 +315,60 @@ class ElectrumWindow(QMainWindow):
         menubar = QMenuBar()
 
         file_menu = menubar.addMenu(_("&File"))
-        open_wallet_action = file_menu.addAction(_("&Open"))
-        open_wallet_action.setShortcut(QKeySequence.Open)
-        open_wallet_action.triggered.connect(self.open_wallet)
-
-        new_wallet_action = file_menu.addAction(_("&New/Restore"))
-        new_wallet_action.setShortcut(QKeySequence.New)
-        new_wallet_action.triggered.connect(self.new_wallet)
-
-        wallet_backup = file_menu.addAction(_("&Save Copy"))
-        wallet_backup.setShortcut(QKeySequence.SaveAs)
-        wallet_backup.triggered.connect(self.backup_wallet)
-
-        quit_item = file_menu.addAction(_("&Quit"))
-        #quit_item.setShortcut(QKeySequence.Quit)
-        quit_item.triggered.connect(self.close)
+        file_menu.addAction(_("&Open"), self.open_wallet).setShortcut(QKeySequence.Open)
+        file_menu.addAction(_("&New/Restore"), self.new_wallet).setShortcut(QKeySequence.New)
+        file_menu.addAction(_("&Save Copy"), self.backup_wallet).setShortcut(QKeySequence.SaveAs)
+        file_menu.addAction(_("&Quit"), self.close)
 
         wallet_menu = menubar.addMenu(_("&Wallet"))
-
-        new_contact = wallet_menu.addAction(_("&New contact"))
-        new_contact.triggered.connect(self.new_contact_dialog)
-
-        self.new_account = wallet_menu.addAction(_("&New account"))
-        self.new_account.triggered.connect(self.new_account_dialog)
+        wallet_menu.addAction(_("&New contact"), self.new_contact_dialog)
+        self.new_account_menu = wallet_menu.addAction(_("&New account"), self.new_account_dialog)
 
         wallet_menu.addSeparator()
 
-        pw = wallet_menu.addAction(_("&Password"))
-        pw.triggered.connect(self.change_password_dialog)
-
-        show_seed = wallet_menu.addAction(_("&Seed"))
-        show_seed.triggered.connect(self.show_seed_dialog)
-
-        show_mpk = wallet_menu.addAction(_("&Master Public Key"))
-        show_mpk.triggered.connect(self.show_master_public_key)
+        self.password_menu = wallet_menu.addAction(_("&Password"), self.change_password_dialog)
+        self.seed_menu = wallet_menu.addAction(_("&Seed"), self.show_seed_dialog)
+        self.mpk_menu = wallet_menu.addAction(_("&Master Public Keys"), self.show_master_public_keys)
 
         wallet_menu.addSeparator()
-
         labels_menu = wallet_menu.addMenu(_("&Labels"))
-        import_labels = labels_menu.addAction(_("&Import"))
-        import_labels.triggered.connect(self.do_import_labels)
-        export_labels = labels_menu.addAction(_("&Export"))
-        export_labels.triggered.connect(self.do_export_labels)
-
-        keys_menu = wallet_menu.addMenu(_("&Private keys"))
-        import_keys = keys_menu.addAction(_("&Import"))
-        import_keys.triggered.connect(self.do_import_privkey)
-        export_keys = keys_menu.addAction(_("&Export"))
-        export_keys.triggered.connect(self.do_export_privkeys)
-
-        ex_history = wallet_menu.addAction(_("&Export History"))
-        ex_history.triggered.connect(self.do_export_history)
-
+        labels_menu.addAction(_("&Import"), self.do_import_labels)
+        labels_menu.addAction(_("&Export"), self.do_export_labels)
 
+        self.private_keys_menu = wallet_menu.addMenu(_("&Private keys"))
+        self.private_keys_menu.addAction(_("&Sweep"), self.sweep_key_dialog)
+        self.import_menu = self.private_keys_menu.addAction(_("&Import"), self.do_import_privkey)
+        self.private_keys_menu.addAction(_("&Export"), self.export_privkeys_dialog)
+        wallet_menu.addAction(_("&Export History"), self.export_history_dialog)
 
         tools_menu = menubar.addMenu(_("&Tools"))
 
         # Settings / Preferences are all reserved keywords in OSX using this as work around
-        preferences_name = _("Electrum preferences") if sys.platform == 'darwin' else _("Preferences")
-        preferences_menu = tools_menu.addAction(preferences_name)
-        #preferences_menu.setShortcut(QKeySequence.Preferences)
-        preferences_menu.triggered.connect(self.settings_dialog)
-
-        network = tools_menu.addAction(_("&Network"))
-        network.triggered.connect(self.run_network_dialog)
-
-        plugins_labels = tools_menu.addAction(_("&Plugins"))
-        plugins_labels.triggered.connect(self.plugins_dialog)
-
+        tools_menu.addAction(_("Electrum preferences") if sys.platform == 'darwin' else _("Preferences"), self.settings_dialog)
+        tools_menu.addAction(_("&Network"), self.run_network_dialog)
+        tools_menu.addAction(_("&Plugins"), self.plugins_dialog)
+        tools_menu.addSeparator()
+        tools_menu.addAction(_("&Sign/verify message"), self.sign_verify_message)
+        tools_menu.addAction(_("&Encrypt/decrypt message"), self.encrypt_message)
         tools_menu.addSeparator()
-
-        verifymessage = tools_menu.addAction(_("&Verify message"))
-        verifymessage.triggered.connect(lambda: self.sign_verify_message(False))
 
         csv_transaction_menu = tools_menu.addMenu(_("&Create transaction"))
-
-        csv_transaction_file = csv_transaction_menu.addAction(_("&From CSV file"))
-        csv_transaction_file.triggered.connect(self.do_process_from_csv_file)
-
-        csv_transaction_text = csv_transaction_menu.addAction(_("&From CSV text"))
-        csv_transaction_text.triggered.connect(self.do_process_from_csv_text)
+        csv_transaction_menu.addAction(_("&From CSV file"), self.do_process_from_csv_file)
+        csv_transaction_menu.addAction(_("&From CSV text"), self.do_process_from_csv_text)
 
         raw_transaction_menu = tools_menu.addMenu(_("&Load transaction"))
-
-        raw_transaction_file = raw_transaction_menu.addAction(_("&From file"))
-        raw_transaction_file.triggered.connect(self.do_process_from_file)
-
-        raw_transaction_text = raw_transaction_menu.addAction(_("&From text"))
-        raw_transaction_text.triggered.connect(self.do_process_from_text)
-
-        raw_transaction_text = raw_transaction_menu.addAction(_("&From the blockchain"))
-        raw_transaction_text.triggered.connect(self.do_process_from_txid)
-
+        raw_transaction_menu.addAction(_("&From file"), self.do_process_from_file)
+        raw_transaction_menu.addAction(_("&From text"), self.do_process_from_text)
+        raw_transaction_menu.addAction(_("&From the blockchain"), self.do_process_from_txid)
+        raw_transaction_menu.addAction(_("&From QR code"), self.read_tx_from_qrcode)
+        self.raw_transaction_menu = raw_transaction_menu
 
         help_menu = menubar.addMenu(_("&Help"))
-        show_about = help_menu.addAction(_("&About"))
-        show_about.triggered.connect(self.show_about)
-        web_open = help_menu.addAction(_("&Official website"))
-        web_open.triggered.connect(lambda: webbrowser.open("http://electrum.org"))
-
+        help_menu.addAction(_("&About"), self.show_about)
+        help_menu.addAction(_("&Official website"), lambda: webbrowser.open("http://electrum.org"))
         help_menu.addSeparator()
-        doc_open = help_menu.addAction(_("&Documentation"))
-        doc_open.setShortcut(QKeySequence.HelpContents)
-        doc_open.triggered.connect(lambda: webbrowser.open("http://electrum.org/documentation.html"))
-        report_bug = help_menu.addAction(_("&Report Bug"))
-        report_bug.triggered.connect(self.show_report_bug)
+        help_menu.addAction(_("&Documentation"), lambda: webbrowser.open("http://electrum.org/documentation.html")).setShortcut(QKeySequence.HelpContents)
+        help_menu.addAction(_("&Report Bug"), self.show_report_bug)
 
         self.setMenuBar(menubar)
 
@@ -463,12 +386,12 @@ class ElectrumWindow(QMainWindow):
             return
 
         print_error("Notifying GUI")
-        if len(self.network.interface.pending_transactions_for_notifications) > 0:
+        if len(self.network.pending_transactions_for_notifications) > 0:
             # Combine the transactions if there are more then three
-            tx_amount = len(self.network.interface.pending_transactions_for_notifications)
+            tx_amount = len(self.network.pending_transactions_for_notifications)
             if(tx_amount >= 3):
                 total_amount = 0
-                for tx in self.network.interface.pending_transactions_for_notifications:
+                for tx in self.network.pending_transactions_for_notifications:
                     is_relevant, is_mine, v, fee = self.wallet.get_tx_value(tx)
                     if(v > 0):
                         total_amount += v
@@ -476,11 +399,11 @@ class ElectrumWindow(QMainWindow):
                 self.notify(_("%(txs)s new transactions received. Total amount received in the new transactions %(amount)s %(unit)s") \
                                 % { 'txs' : tx_amount, 'amount' : self.format_amount(total_amount), 'unit' : self.base_unit()})
 
-                self.network.interface.pending_transactions_for_notifications = []
+                self.network.pending_transactions_for_notifications = []
             else:
-              for tx in self.network.interface.pending_transactions_for_notifications:
+              for tx in self.network.pending_transactions_for_notifications:
                   if tx:
-                      self.network.interface.pending_transactions_for_notifications.remove(tx)
+                      self.network.pending_transactions_for_notifications.remove(tx)
                       is_relevant, is_mine, v, fee = self.wallet.get_tx_value(tx)
                       if(v > 0):
                           self.notify(_("New transaction received. %(amount)s %(unit)s") % { 'amount' : self.format_amount(v), 'unit' : self.base_unit()})
@@ -492,14 +415,14 @@ class ElectrumWindow(QMainWindow):
 
     # custom wrappers for getOpenFileName and getSaveFileName, that remember the path selected by the user
     def getOpenFileName(self, title, filter = ""):
-        directory = self.config.get('io_dir', os.path.expanduser('~'))
+        directory = self.config.get('io_dir', unicode(os.path.expanduser('~')))
         fileName = unicode( QFileDialog.getOpenFileName(self, title, directory, filter) )
         if fileName and directory != os.path.dirname(fileName):
             self.config.set_key('io_dir', os.path.dirname(fileName), True)
         return fileName
 
     def getSaveFileName(self, title, filename, filter = ""):
-        directory = self.config.get('io_dir', os.path.expanduser('~'))
+        directory = self.config.get('io_dir', unicode(os.path.expanduser('~')))
         path = os.path.join( directory, filename )
         fileName = unicode( QFileDialog.getSaveFileName(self, title, path, filter) )
         if fileName and directory != os.path.dirname(fileName):
@@ -518,21 +441,27 @@ class ElectrumWindow(QMainWindow):
         if self.need_update.is_set():
             self.update_wallet()
             self.need_update.clear()
+
         run_hook('timer_actions')
 
     def format_amount(self, x, is_diff=False, whitespaces=False):
         return format_satoshis(x, is_diff, self.num_zeros, self.decimal_point, whitespaces)
 
-    def read_amount(self, x):
-        if x in['.', '']: return None
-        p = pow(10, self.decimal_point)
-        return int( p * Decimal(x) )
 
-    def base_unit(self):
-        assert self.decimal_point in [5,8]
-        return "BTC" if self.decimal_point == 8 else "mBTC"
+    def get_decimal_point(self):
+        return self.decimal_point
 
 
+    def base_unit(self):
+        assert self.decimal_point in [2, 5, 8]
+        if self.decimal_point == 2:
+            return 'bits'
+        if self.decimal_point == 5:
+            return 'mBTC'
+        if self.decimal_point == 8:
+            return 'BTC'
+        raise Exception('Unknown base unit')
+
     def update_status(self):
         if self.network is None or not self.network.is_running():
             text = _("Offline")
@@ -550,11 +479,12 @@ class ElectrumWindow(QMainWindow):
                 text =  _( "Balance" ) + ": %s "%( self.format_amount(c) ) + self.base_unit()
                 if u: text +=  " [%s unconfirmed]"%( self.format_amount(u,True).strip() )
 
+                # append fiat balance and price from exchange rate plugin
                 r = {}
-                run_hook('set_quote_text', c+u, r)
+                run_hook('get_fiat_status_text', c+u, r)
                 quote = r.get(0)
                 if quote:
-                    text += "  (%s)"%quote
+                    text += "%s"%quote
 
                 self.tray.setToolTip(text)
                 icon = QIcon(":icons/status_connected.png")
@@ -571,8 +501,10 @@ class ElectrumWindow(QMainWindow):
         if self.wallet.up_to_date or not self.network or not self.network.is_connected():
             self.update_history_tab()
             self.update_receive_tab()
+            self.update_address_tab()
             self.update_contacts_tab()
             self.update_completions()
+            self.update_invoices_tab()
 
 
     def create_history_tab(self):
@@ -581,9 +513,8 @@ class ElectrumWindow(QMainWindow):
         for i,width in enumerate(self.column_widths['history']):
             l.setColumnWidth(i, width)
         l.setHeaderLabels( [ '', _('Date'), _('Description') , _('Amount'), _('Balance')] )
-        self.connect(l, SIGNAL('itemDoubleClicked(QTreeWidgetItem*, int)'), self.tx_label_clicked)
-        self.connect(l, SIGNAL('itemChanged(QTreeWidgetItem*, int)'), self.tx_label_changed)
-
+        l.itemDoubleClicked.connect(self.tx_label_clicked)
+        l.itemChanged.connect(self.tx_label_changed)
         l.customContextMenuRequested.connect(self.create_history_menu)
         return l
 
@@ -591,6 +522,13 @@ class ElectrumWindow(QMainWindow):
     def create_history_menu(self, position):
         self.history_list.selectedIndexes()
         item = self.history_list.currentItem()
+        be = self.config.get('block_explorer', 'Blockchain.info')
+        if be == 'Blockchain.info':
+            block_explorer = 'https://blockchain.info/tx/'
+        elif be == 'Blockr.io':
+            block_explorer = 'https://blockr.io/tx/info/'
+        elif be == 'Insight.is':
+            block_explorer = 'http://live.insight.is/tx/'
         if not item: return
         tx_hash = str(item.data(0, Qt.UserRole).toString())
         if not tx_hash: return
@@ -598,7 +536,7 @@ class ElectrumWindow(QMainWindow):
         menu.addAction(_("Copy ID to Clipboard"), lambda: self.app.clipboard().setText(tx_hash))
         menu.addAction(_("Details"), lambda: self.show_transaction(self.wallet.transactions.get(tx_hash)))
         menu.addAction(_("Edit description"), lambda: self.tx_label_clicked(item,2))
-        menu.addAction(_("View on Blockchain.info"), lambda: webbrowser.open("https://blockchain.info/tx/" + tx_hash))
+        menu.addAction(_("View on block explorer"), lambda: webbrowser.open(block_explorer + tx_hash))
         menu.exec_(self.contacts_list.viewport().mapToGlobal(position))
 
 
@@ -633,7 +571,7 @@ class ElectrumWindow(QMainWindow):
 
 
     def edit_label(self, is_recv):
-        l = self.receive_list if is_recv else self.contacts_list
+        l = self.address_list if is_recv else self.contacts_list
         item = l.currentItem()
         item.setFlags(Qt.ItemIsEditable|Qt.ItemIsSelectable | Qt.ItemIsUserCheckable | Qt.ItemIsEnabled | Qt.ItemIsDragEnabled)
         l.editItem( item, 1 )
@@ -732,51 +670,207 @@ class ElectrumWindow(QMainWindow):
         run_hook('history_tab_update')
 
 
+    def create_receive_tab(self):
+        w = QWidget()
+        grid = QGridLayout(w)
+        grid.setColumnMinimumWidth(3, 300)
+        grid.setColumnStretch(5, 1)
+
+        self.receive_address_e = QLineEdit()
+        self.receive_address_e.setReadOnly(True)
+        grid.addWidget(QLabel(_('Receiving address')), 0, 0)
+        grid.addWidget(self.receive_address_e, 0, 1, 1, 3)
+        self.receive_address_e.textChanged.connect(self.update_receive_qr)
+
+        self.receive_message_e = QLineEdit()
+        grid.addWidget(QLabel(_('Message')), 1, 0)
+        grid.addWidget(self.receive_message_e, 1, 1, 1, 3)
+        self.receive_message_e.textChanged.connect(self.update_receive_qr)
+
+        self.receive_amount_e = BTCAmountEdit(self.get_decimal_point)
+        grid.addWidget(QLabel(_('Requested amount')), 2, 0)
+        grid.addWidget(self.receive_amount_e, 2, 1, 1, 2)
+        self.receive_amount_e.textChanged.connect(self.update_receive_qr)
+
+        self.save_request_button = QPushButton(_('Save'))
+        self.save_request_button.clicked.connect(self.save_payment_request)
+        grid.addWidget(self.save_request_button, 3, 1)
+        clear_button = QPushButton(_('New'))
+        clear_button.clicked.connect(self.new_receive_address)
+        grid.addWidget(clear_button, 3, 2)
+        grid.setRowStretch(4, 1)
+
+        self.receive_qr = QRCodeWidget(fixedSize=200)
+        grid.addWidget(self.receive_qr, 0, 4, 5, 2)
+
+        grid.setRowStretch(5, 1)
+
+        self.receive_requests_label = QLabel(_('Saved Requests'))
+        self.receive_list = MyTreeWidget(self)
+        self.receive_list.customContextMenuRequested.connect(self.receive_list_menu)
+        self.receive_list.currentItemChanged.connect(self.receive_item_changed)
+        self.receive_list.itemClicked.connect(self.receive_item_changed)
+        self.receive_list.setHeaderLabels( [_('Address'), _('Message'), _('Amount')] )
+        self.receive_list.setColumnWidth(0, 340)
+        h = self.receive_list.header()
+        h.setStretchLastSection(False)
+        h.setResizeMode(1, QHeaderView.Stretch)
+
+        grid.addWidget(self.receive_requests_label, 6, 0)
+        grid.addWidget(self.receive_list, 7, 0, 1, 6)
+        return w
+
+    def receive_item_changed(self, item):
+        if item is None:
+            return
+        addr = str(item.text(0))
+        amount, message = self.receive_requests[addr]
+        self.receive_address_e.setText(addr)
+        self.receive_message_e.setText(message)
+        self.receive_amount_e.setAmount(amount)
+
+
+    def receive_list_delete(self, item):
+        addr = str(item.text(0))
+        self.receive_requests.pop(addr)
+        self.update_receive_tab()
+        self.clear_receive_tab()
+
+    def receive_list_menu(self, position):
+        item = self.receive_list.itemAt(position)
+        menu = QMenu()
+        menu.addAction(_("Delete"), lambda: self.receive_list_delete(item))
+        menu.exec_(self.receive_list.viewport().mapToGlobal(position))
+
+    def save_payment_request(self):
+        addr = str(self.receive_address_e.text())
+        amount = self.receive_amount_e.get_amount()
+        message = str(self.receive_message_e.text())
+        if not message and not amount:
+            QMessageBox.warning(self, _('Error'), _('No message or amount'), _('OK'))
+            return
+        self.receive_requests = self.wallet.storage.get('receive_requests',{}) 
+        self.receive_requests[addr] = (amount, message)
+        self.wallet.storage.put('receive_requests', self.receive_requests)
+        self.update_receive_tab()
+
+    def new_receive_address(self):
+        domain = self.wallet.get_account_addresses(self.current_account, include_change=False)
+        for addr in domain:
+            if not self.wallet.history.get(addr) and addr not in self.receive_requests.keys():
+                break
+        else:
+            if isinstance(self.wallet, Imported_Wallet):
+                self.show_message(_('No more addresses in your wallet.'))
+                return
+            if not self.question(_("Warning: The next address will not be recovered automatically if you restore your wallet from seed; you may need to add it manually.\n\nThis occurs because you have too many unused addresses in your wallet. To avoid this situation, use the existing addresses first.\n\nCreate anyway?")):
+                return
+            addr = self.wallet.create_new_address(self.current_account, False)
+        self.receive_address_e.setText(addr)
+        self.receive_message_e.setText('')
+        self.receive_amount_e.setAmount(None)
+
+    def clear_receive_tab(self):
+        self.receive_requests = self.wallet.storage.get('receive_requests',{}) 
+        domain = self.wallet.get_account_addresses(self.current_account, include_change=False)
+        for addr in domain:
+            if not self.wallet.history.get(addr) and addr not in self.receive_requests.keys():
+                break
+        else:
+            addr = ''
+        self.receive_address_e.setText(addr)
+        self.receive_message_e.setText('')
+        self.receive_amount_e.setAmount(None)
+
+    def receive_at(self, addr):
+        if not bitcoin.is_address(addr):
+            return
+        self.tabs.setCurrentIndex(2)
+        self.receive_address_e.setText(addr)
+
+    def update_receive_tab(self):
+        self.receive_requests = self.wallet.storage.get('receive_requests',{}) 
+        b = len(self.receive_requests) > 0
+        self.receive_list.setVisible(b)
+        self.receive_requests_label.setVisible(b)
+
+        self.receive_list.clear()
+        for address, v in self.receive_requests.items():
+            amount, message = v
+            item = QTreeWidgetItem( [ address, message, self.format_amount(amount) if amount else ""] )
+            item.setFont(0, QFont(MONOSPACE_FONT))
+            self.receive_list.addTopLevelItem(item)
+
+
+    def update_receive_qr(self):
+        import urlparse, urllib
+        addr = str(self.receive_address_e.text())
+        amount = self.receive_amount_e.get_amount()
+        message = unicode(self.receive_message_e.text()).encode('utf8')
+        self.save_request_button.setEnabled((amount is not None) or (message != ""))
+        if addr:
+            query = []
+            if amount:
+                query.append('amount=%s'%format_satoshis(amount))
+            if message:
+                query.append('message=%s'%urllib.quote(message))
+            p = urlparse.ParseResult(scheme='bitcoin', netloc='', path=addr, params='', query='&'.join(query), fragment='')
+            url = urlparse.urlunparse(p)
+        else:
+            url = ""
+        self.receive_qr.setData(url)
+        run_hook('update_receive_qr', addr, amount, message, url)
+
+
     def create_send_tab(self):
         w = QWidget()
 
-        grid = QGridLayout()
+        self.send_grid = grid = QGridLayout(w)
         grid.setSpacing(8)
         grid.setColumnMinimumWidth(3,300)
         grid.setColumnStretch(5,1)
+        grid.setRowStretch(8, 1)
 
-
-        self.payto_e = QLineEdit()
+        from paytoedit import PayToEdit
+        self.amount_e = BTCAmountEdit(self.get_decimal_point)
+        self.payto_e = PayToEdit(self)
+        self.payto_help = HelpButton(_('Recipient of the funds.') + '\n\n' + _('You may enter a Bitcoin address, a label from your list of contacts (a list of completions will be proposed), or an alias (email-like address that forwards to a Bitcoin address)'))
         grid.addWidget(QLabel(_('Pay to')), 1, 0)
         grid.addWidget(self.payto_e, 1, 1, 1, 3)
-
-        grid.addWidget(HelpButton(_('Recipient of the funds.') + '\n\n' + _('You may enter a Bitcoin address, a label from your list of contacts (a list of completions will be proposed), or an alias (email-like address that forwards to a Bitcoin address)')), 1, 4)
+        grid.addWidget(self.payto_help, 1, 4)
 
         completer = QCompleter()
         completer.setCaseSensitivity(False)
         self.payto_e.setCompleter(completer)
         completer.setModel(self.completions)
 
-        self.message_e = QLineEdit()
+        self.message_e = MyLineEdit()
+        self.message_help = HelpButton(_('Description of the transaction (not mandatory).') + '\n\n' + _('The description is not sent to the recipient of the funds. It is stored in your wallet file, and displayed in the \'History\' tab.'))
         grid.addWidget(QLabel(_('Description')), 2, 0)
         grid.addWidget(self.message_e, 2, 1, 1, 3)
-        grid.addWidget(HelpButton(_('Description of the transaction (not mandatory).') + '\n\n' + _('The description is not sent to the recipient of the funds. It is stored in your wallet file, and displayed in the \'History\' tab.')), 2, 4)
+        grid.addWidget(self.message_help, 2, 4)
 
         self.from_label = QLabel(_('From'))
         grid.addWidget(self.from_label, 3, 0)
-        self.from_list = QTreeWidget(self)
+        self.from_list = MyTreeWidget(self)
         self.from_list.setColumnCount(2)
         self.from_list.setColumnWidth(0, 350)
         self.from_list.setColumnWidth(1, 50)
-        self.from_list.setHeaderHidden (True)
+        self.from_list.setHeaderHidden(True)
         self.from_list.setMaximumHeight(80)
+        self.from_list.setContextMenuPolicy(Qt.CustomContextMenu)
+        self.from_list.customContextMenuRequested.connect(self.from_list_menu)
         grid.addWidget(self.from_list, 3, 1, 1, 3)
         self.set_pay_from([])
 
-        self.amount_e = AmountEdit(self.base_unit)
+        self.amount_help = HelpButton(_('Amount to be sent.') + '\n\n' \
+                                      + _('The amount will be displayed in red if you do not have enough funds in your wallet. Note that if you have frozen some of your addresses, the available funds will be lower than your total balance.') \
+                                      + '\n\n' + _('Keyboard shortcut: type "!" to send all your coins.'))
         grid.addWidget(QLabel(_('Amount')), 4, 0)
         grid.addWidget(self.amount_e, 4, 1, 1, 2)
-        grid.addWidget(HelpButton(
-                _('Amount to be sent.') + '\n\n' \
-                    + _('The amount will be displayed in red if you do not have enough funds in your wallet. Note that if you have frozen some of your addresses, the available funds will be lower than your total balance.') \
-                    + '\n\n' + _('Keyboard shortcut: type "!" to send all your coins.')), 4, 3)
+        grid.addWidget(self.amount_help, 4, 3)
 
-        self.fee_e = AmountEdit(self.base_unit)
+        self.fee_e = BTCAmountEdit(self.get_decimal_point)
         grid.addWidget(QLabel(_('Fee')), 5, 0)
         grid.addWidget(self.fee_e, 5, 1, 1, 2)
         grid.addWidget(HelpButton(
@@ -784,59 +878,59 @@ class ElectrumWindow(QMainWindow):
                     + _('The amount of fee can be decided freely by the sender. However, transactions with low fees take more time to be processed.') + '\n\n'\
                     + _('A suggested fee is automatically added to this field. You may override it. The suggested fee increases with the size of the transaction.')), 5, 3)
 
-
         self.send_button = EnterButton(_("Send"), self.do_send)
         grid.addWidget(self.send_button, 6, 1)
 
-        b = EnterButton(_("Clear"),self.do_clear)
+        b = EnterButton(_("Clear"), self.do_clear)
         grid.addWidget(b, 6, 2)
 
         self.payto_sig = QLabel('')
         grid.addWidget(self.payto_sig, 7, 0, 1, 4)
 
-        QShortcut(QKeySequence("Up"), w, w.focusPreviousChild)
-        QShortcut(QKeySequence("Down"), w, w.focusNextChild)
+        #QShortcut(QKeySequence("Up"), w, w.focusPreviousChild)
+        #QShortcut(QKeySequence("Down"), w, w.focusNextChild)
         w.setLayout(grid)
 
-        w2 = QWidget()
-        vbox = QVBoxLayout()
-        vbox.addWidget(w)
-        vbox.addStretch(1)
-        w2.setLayout(vbox)
-
         def entry_changed( is_fee ):
-            self.funds_error = False
 
             if self.amount_e.is_shortcut:
                 self.amount_e.is_shortcut = False
                 sendable = self.get_sendable_balance()
-                inputs, total, fee = self.wallet.choose_tx_inputs( sendable, 0, self.get_payment_sources())
-                fee = self.wallet.estimated_fee(inputs)
+                # there is only one output because we are completely spending inputs
+                inputs, total, fee = self.wallet.choose_tx_inputs( sendable, 0, 1, coins = self.get_coins())
+                fee = self.wallet.estimated_fee(inputs, 1)
                 amount = total - fee
-                self.amount_e.setText( self.format_amount(amount) )
-                self.fee_e.setText( self.format_amount( fee ) )
+                self.amount_e.setAmount(amount)
+                self.amount_e.textEdited.emit("")
+                self.fee_e.setAmount(fee)
                 return
 
-            amount = self.read_amount(str(self.amount_e.text()))
-            fee = self.read_amount(str(self.fee_e.text()))
+            amount = self.amount_e.get_amount()
+            fee = self.fee_e.get_amount()
+            outputs = self.payto_e.get_outputs()
+
+            if not is_fee: 
+                fee = None
 
-            if not is_fee: fee = None
             if amount is None:
-                return
-            inputs, total, fee = self.wallet.choose_tx_inputs(amount, fee, self.get_payment_sources())
-            if not is_fee:
-                self.fee_e.setText( self.format_amount( fee ) )
-            if inputs:
+                self.fee_e.setAmount(None)
+                not_enough_funds = False
+            else:
+                inputs, total, fee = self.wallet.choose_tx_inputs(amount, fee, len(outputs), coins = self.get_coins())
+                not_enough_funds = len(inputs) == 0
+                if not is_fee:
+                    self.fee_e.setAmount(fee)
+                    
+            if not not_enough_funds:
                 palette = QPalette()
                 palette.setColor(self.amount_e.foregroundRole(), QColor('black'))
                 text = ""
             else:
                 palette = QPalette()
                 palette.setColor(self.amount_e.foregroundRole(), QColor('red'))
-                self.funds_error = True
                 text = _( "Not enough funds" )
                 c, u = self.wallet.get_frozen_balance()
-                if c+u: text += ' (' + self.format_amount(c+u).strip() + self.base_unit() + ' ' +_("are frozen") + ')'
+                if c+u: text += ' (' + self.format_amount(c+u).strip() + ' ' + self.base_unit() + ' ' +_("are frozen") + ')'
 
             self.statusBar().showMessage(text)
             self.amount_e.setPalette(palette)
@@ -846,19 +940,34 @@ class ElectrumWindow(QMainWindow):
         self.fee_e.textChanged.connect(lambda: entry_changed(True) )
 
         run_hook('create_send_tab', grid)
-        return w2
+        return w
+
+    def from_list_delete(self, item):
+        i = self.from_list.indexOfTopLevelItem(item)
+        self.pay_from.pop(i)
+        self.redraw_from_list()
+
+    def from_list_menu(self, position):
+        item = self.from_list.itemAt(position)
+        menu = QMenu()
+        menu.addAction(_("Remove"), lambda: self.from_list_delete(item))
+        menu.exec_(self.from_list.viewport().mapToGlobal(position))
 
+    def set_pay_from(self, domain = None):
+        self.pay_from = [] if domain == [] else self.wallet.get_unspent_coins(domain)
+        self.redraw_from_list()
 
-    def set_pay_from(self, l):
-        self.pay_from = l
+    def redraw_from_list(self):
         self.from_list.clear()
         self.from_label.setHidden(len(self.pay_from) == 0)
         self.from_list.setHidden(len(self.pay_from) == 0)
-        for addr in self.pay_from:
-            c, u = self.wallet.get_addr_balance(addr)
-            balance = self.format_amount(c + u)
-            self.from_list.addTopLevelItem(QTreeWidgetItem( [addr, balance] ))
 
+        def format(x):
+            h = x.get('prevout_hash')
+            return h[0:8] + '...' + h[-8:] + ":%d"%x.get('prevout_n') + u'\t' + "%s"%x.get('address')
+
+        for item in self.pay_from:
+            self.from_list.addTopLevelItem(QTreeWidgetItem( [format(item), self.format_amount(item['value']) ]))
 
     def update_completions(self):
         l = []
@@ -874,34 +983,47 @@ class ElectrumWindow(QMainWindow):
         return lambda s, *args: s.do_protect(func, args)
 
 
-    def do_send(self):
+    def read_send_tab(self):
+
+        if self.payment_request and self.payment_request.has_expired():
+            QMessageBox.warning(self, _('Error'), _('Payment request has expired'), _('OK'))
+            return
 
         label = unicode( self.message_e.text() )
-        r = unicode( self.payto_e.text() )
-        r = r.strip()
 
-        # label or alias, with address in brackets
-        m = re.match('(.*?)\s*\<([1-9A-HJ-NP-Za-km-z]{26,})\>', r)
-        to_address = m.group(2) if m else r
+        if self.payment_request:
+            outputs = self.payment_request.get_outputs()
+        else:
+            outputs = self.payto_e.get_outputs()
 
-        if not is_valid(to_address):
-            QMessageBox.warning(self, _('Error'), _('Invalid Bitcoin Address') + ':\n' + to_address, _('OK'))
+        if not outputs:
+            QMessageBox.warning(self, _('Error'), _('No outputs'), _('OK'))
             return
 
-        try:
-            amount = self.read_amount(unicode( self.amount_e.text()))
-        except Exception:
-            QMessageBox.warning(self, _('Error'), _('Invalid Amount'), _('OK'))
-            return
-        try:
-            fee = self.read_amount(unicode( self.fee_e.text()))
-        except Exception:
+        for type, addr, amount in outputs:
+            if addr is None:
+                QMessageBox.warning(self, _('Error'), _('Bitcoin Address is None'), _('OK'))
+                return
+            if type == 'op_return':
+                continue
+            if type == 'address' and not bitcoin.is_address(addr):
+                QMessageBox.warning(self, _('Error'), _('Invalid Bitcoin Address'), _('OK'))
+                return
+            if amount is None:
+                QMessageBox.warning(self, _('Error'), _('Invalid Amount'), _('OK'))
+                return
+
+        amount = sum(map(lambda x:x[2], outputs))
+
+        fee = self.fee_e.get_amount()
+        if fee is None:
             QMessageBox.warning(self, _('Error'), _('Invalid Fee'), _('OK'))
             return
 
         confirm_amount = self.config.get('confirm_amount', 100000000)
         if amount >= confirm_amount:
-            if not self.question(_("send %(amount)s to %(address)s?")%{ 'amount' : self.format_amount(amount) + ' '+ self.base_unit(), 'address' : to_address}):
+            o = '\n'.join(map(lambda x:x[1], outputs))
+            if not self.question(_("send %(amount)s to %(address)s?")%{ 'amount' : self.format_amount(amount) + ' '+ self.base_unit(), 'address' : o}):
                 return
             
         confirm_fee = self.config.get('confirm_fee', 100000)
@@ -909,107 +1031,214 @@ class ElectrumWindow(QMainWindow):
             if not self.question(_("The fee for this transaction seems unusually high.\nAre you really sure you want to pay %(fee)s in fees?")%{ 'fee' : self.format_amount(fee) + ' '+ self.base_unit()}):
                 return
 
-        self.send_tx(to_address, amount, fee, label)
+        coins = self.get_coins()
+        return outputs, fee, label, coins
+
+
+    def do_send(self):
+        r = self.read_send_tab()
+        if not r:
+            return
+        outputs, fee, label, coins = r
+        self.send_tx(outputs, fee, label, coins)
 
 
     @protected
-    def send_tx(self, to_address, amount, fee, label, password):
+    def send_tx(self, outputs, fee, label, coins, password):
+        self.send_button.setDisabled(True)
+
+        # first, create an unsigned tx 
         try:
-            tx = self.wallet.mktx( [(to_address, amount)], password, fee,
-                    domain=self.get_payment_sources())
+            tx = self.wallet.make_unsigned_transaction(outputs, fee, None, coins = coins)
+            tx.error = None
         except Exception as e:
             traceback.print_exc(file=sys.stdout)
             self.show_message(str(e))
+            self.send_button.setDisabled(False)
             return
 
-        if tx.requires_fee(self.wallet.verifier) and fee < MIN_RELAY_TX_FEE:
-            QMessageBox.warning(self, _('Error'), _("This transaction requires a higher fee, or it will not be propagated by the network."), _('OK'))
-            return
+        # call hook to see if plugin needs gui interaction
+        run_hook('send_tx', tx)
 
-        if label:
-            self.wallet.set_label(tx.hash(), label)
+        # sign the tx
+        def sign_thread():
+            if self.wallet.is_watching_only():
+                return tx
+            keypairs = {}
+            try:
+                self.wallet.add_keypairs(tx, keypairs, password)
+                self.wallet.sign_transaction(tx, keypairs, password)
+            except Exception as e:
+                traceback.print_exc(file=sys.stdout)
+                tx.error = str(e)
+            return tx
 
-        if tx.is_complete:
-            h = self.wallet.send_tx(tx)
-            waiting_dialog(lambda: False if self.wallet.tx_event.isSet() else _("Please wait..."))
-            status, msg = self.wallet.receive_tx( h, tx )
+        def sign_done(tx):
+            if tx.error:
+                self.show_message(tx.error)
+                self.send_button.setDisabled(False)
+                return
+            if tx.requires_fee(self.wallet.verifier) and fee < MIN_RELAY_TX_FEE:
+                QMessageBox.warning(self, _('Error'), _("This transaction requires a higher fee, or it will not be propagated by the network."), _('OK'))
+                self.send_button.setDisabled(False)
+                return
+            if label:
+                self.wallet.set_label(tx.hash(), label)
+
+            if not tx.is_complete() or self.config.get('show_before_broadcast'):
+                self.show_transaction(tx)
+                self.do_clear()
+                self.send_button.setDisabled(False)
+                return
+
+            self.broadcast_transaction(tx)
+
+        # keep a reference to WaitingDialog or the gui might crash
+        self.waiting_dialog = WaitingDialog(self, 'Signing..', sign_thread, sign_done)
+        self.waiting_dialog.start()
+
+
+
+    def broadcast_transaction(self, tx):
+
+        def broadcast_thread():
+            pr = self.payment_request
+            if pr is None:
+                return self.wallet.sendtx(tx)
+
+            if pr.has_expired():
+                self.payment_request = None
+                return False, _("Payment request has expired")
+
+            status, msg =  self.wallet.sendtx(tx)
+            if not status:
+                return False, msg
+
+            self.invoices[pr.get_id()] = (pr.get_domain(), pr.get_memo(), pr.get_amount(), pr.get_expiration_date(), PR_PAID, tx.hash())
+            self.wallet.storage.put('invoices', self.invoices)
+            self.update_invoices_tab()
+            self.payment_request = None
+            refund_address = self.wallet.addresses()[0]
+            ack_status, ack_msg = pr.send_ack(str(tx), refund_address)
+            if ack_status:
+                msg = ack_msg
+
+            return status, msg
+
+        def broadcast_done(status, msg):
             if status:
-                QMessageBox.information(self, '', _('Payment sent.')+'\n'+msg, _('OK'))
+                QMessageBox.information(self, '', _('Payment sent.') + '\n' + msg, _('OK'))
                 self.do_clear()
-                self.update_contacts_tab()
             else:
                 QMessageBox.warning(self, _('Error'), msg, _('OK'))
-        else:
+            self.send_button.setDisabled(False)
 
-            self.show_transaction(tx)
+        self.waiting_dialog = WaitingDialog(self, 'Broadcasting..', broadcast_thread, broadcast_done)
+        self.waiting_dialog.start()
 
-        # add recipient to addressbook
-        if to_address not in self.wallet.addressbook and not self.wallet.is_mine(to_address):
-            self.wallet.addressbook.append(to_address)
 
 
+    def prepare_for_payment_request(self):
+        self.tabs.setCurrentIndex(1)
+        self.payto_e.is_pr = True
+        for e in [self.payto_e, self.amount_e, self.message_e]:
+            e.setFrozen(True)
+        for h in [self.payto_help, self.amount_help, self.message_help]:
+            h.hide()
+        self.payto_e.setText(_("please wait..."))
+        return True
+
+    def payment_request_ok(self):
+        pr = self.payment_request
+        pr_id = pr.get_id()
+        if pr_id not in self.invoices:
+            self.invoices[pr_id] = (pr.get_domain(), pr.get_memo(), pr.get_amount(), pr.get_expiration_date(), PR_UNPAID, None)
+            self.wallet.storage.put('invoices', self.invoices)
+            self.update_invoices_tab()
+        else:
+            print_error('invoice already in list')
 
+        status = self.invoices[pr_id][4]
+        if status == PR_PAID:
+            self.do_clear()
+            self.show_message("invoice already paid")
+            self.payment_request = None
+            return
 
-    def set_url(self, url):
-        address, amount, label, message, signature, identity, url = util.parse_url(url)
+        self.payto_help.show()
+        self.payto_help.set_alt(lambda: self.show_pr_details(pr))
 
-        try:
-            if amount and self.base_unit() == 'mBTC': amount = str( 1000* Decimal(amount))
-            elif amount: amount = str(Decimal(amount))
-        except Exception:
-            amount = "0.0"
-            QMessageBox.warning(self, _('Error'), _('Invalid Amount'), _('OK'))
+        if not pr.has_expired():
+            self.payto_e.setGreen()
+        else:
+            self.payto_e.setExpired()
 
-        if self.mini:
-            self.mini.set_payment_fields(address, amount)
+        self.payto_e.setText(pr.domain)
+        self.amount_e.setText(self.format_amount(pr.get_amount()))
+        self.message_e.setText(pr.get_memo())
 
-        if label and self.wallet.labels.get(address) != label:
-            if self.question('Give label "%s" to address %s ?'%(label,address)):
-                if address not in self.wallet.addressbook and not self.wallet.is_mine(address):
-                    self.wallet.addressbook.append(address)
-                self.wallet.set_label(address, label)
+    def payment_request_error(self):
+        self.do_clear()
+        self.show_message(self.payment_request.error)
+        self.payment_request = None
 
-        run_hook('set_url', url, self.show_message, self.question)
+    def pay_from_URI(self,URI):
+        if not URI:
+            return
+        address, amount, label, message, request_url = util.parse_URI(URI)
+        try:
+            address, amount, label, message, request_url = util.parse_URI(URI)
+        except Exception as e:
+            QMessageBox.warning(self, _('Error'), _('Invalid bitcoin URI:') + '\n' + str(e), _('OK'))
+            return
 
         self.tabs.setCurrentIndex(1)
-        label = self.wallet.labels.get(address)
-        m_addr = label + '  <'+ address +'>' if label else address
-        self.payto_e.setText(m_addr)
 
-        self.message_e.setText(message)
-        if amount:
-            self.amount_e.setText(amount)
+        if not request_url:
+            if label:
+                if self.wallet.labels.get(address) != label:
+                    if self.question(_('Save label "%s" for address %s ?'%(label,address))):
+                        if address not in self.wallet.addressbook and not self.wallet.is_mine(address):
+                            self.wallet.addressbook.append(address)
+                            self.wallet.set_label(address, label)
+            else:
+                label = self.wallet.labels.get(address)
+            if address:
+                self.payto_e.setText(label + '  <'+ address +'>' if label else address)
+            if message:
+                self.message_e.setText(message)
+            if amount:
+                self.amount_e.setAmount(amount)
+            return
+
+        from electrum import paymentrequest
+        def payment_request():
+            self.payment_request = paymentrequest.PaymentRequest(self.config)
+            self.payment_request.read(request_url)
+            if self.payment_request.verify():
+                self.emit(SIGNAL('payment_request_ok'))
+            else:
+                self.emit(SIGNAL('payment_request_error'))
+
+        self.pr_thread = threading.Thread(target=payment_request).start()
+        self.prepare_for_payment_request()
+
 
-        if identity:
-            self.set_frozen(self.payto_e,True)
-            self.set_frozen(self.amount_e,True)
-            self.set_frozen(self.message_e,True)
-            self.payto_sig.setText( '      '+_('The bitcoin URI was signed by')+' ' + identity )
-        else:
-            self.payto_sig.setVisible(False)
 
     def do_clear(self):
+        self.payto_e.is_pr = False
         self.payto_sig.setVisible(False)
         for e in [self.payto_e, self.message_e, self.amount_e, self.fee_e]:
             e.setText('')
-            self.set_frozen(e,False)
+            e.setFrozen(False)
 
+        for h in [self.payto_help, self.amount_help, self.message_help]:
+            h.show()
+
+        self.payto_help.set_alt(None)
         self.set_pay_from([])
         self.update_status()
 
-    def set_frozen(self,entry,frozen):
-        if frozen:
-            entry.setReadOnly(True)
-            entry.setFrame(False)
-            palette = QPalette()
-            palette.setColor(entry.backgroundRole(), QColor('lightgray'))
-            entry.setPalette(palette)
-        else:
-            entry.setReadOnly(False)
-            entry.setFrame(True)
-            palette = QPalette()
-            palette.setColor(entry.backgroundRole(), QColor('white'))
-            entry.setPalette(palette)
 
 
     def set_addrs_frozen(self,addrs,freeze):
@@ -1019,7 +1248,7 @@ class ElectrumWindow(QMainWindow):
                 self.wallet.unfreeze(addr)
             elif addr not in self.wallet.frozen_addresses and freeze:
                 self.wallet.freeze(addr)
-        self.update_receive_tab()
+        self.update_address_tab()
 
 
 
@@ -1039,25 +1268,20 @@ class ElectrumWindow(QMainWindow):
         buttons = QWidget()
         vbox.addWidget(buttons)
 
-        hbox = QHBoxLayout()
-        hbox.setMargin(0)
-        hbox.setSpacing(0)
-        buttons.setLayout(hbox)
-
-        return l,w,hbox
+        return l, w
 
 
-    def create_receive_tab(self):
-        l,w,hbox = self.create_list_tab([ _('Address'), _('Label'), _('Balance'), _('Tx')])
+    def create_addresses_tab(self):
+        l, w = self.create_list_tab([ _('Address'), _('Label'), _('Balance'), _('Tx')])
+        for i,width in enumerate(self.column_widths['receive']):
+            l.setColumnWidth(i, width)
         l.setContextMenuPolicy(Qt.CustomContextMenu)
         l.customContextMenuRequested.connect(self.create_receive_menu)
         l.setSelectionMode(QAbstractItemView.ExtendedSelection)
-        self.connect(l, SIGNAL('itemDoubleClicked(QTreeWidgetItem*, int)'), lambda a, b: self.address_label_clicked(a,b,l,0,1))
-        self.connect(l, SIGNAL('itemChanged(QTreeWidgetItem*, int)'), lambda a,b: self.address_label_changed(a,b,l,0,1))
-        self.connect(l, SIGNAL('currentItemChanged(QTreeWidgetItem*, QTreeWidgetItem*)'), lambda a,b: self.current_item_changed(a))
-        self.receive_list = l
-        self.receive_buttons_hbox = hbox
-        hbox.addStretch(1)
+        l.itemDoubleClicked.connect(lambda a, b: self.address_label_clicked(a,b,l,0,1))
+        l.itemChanged.connect(lambda a,b: self.address_label_changed(a,b,l,0,1))
+        l.currentItemChanged.connect(lambda a,b: self.current_item_changed(a))
+        self.address_list = l
         return w
 
 
@@ -1065,8 +1289,8 @@ class ElectrumWindow(QMainWindow):
 
     def save_column_widths(self):
         self.column_widths["receive"] = []
-        for i in range(self.receive_list.columnCount() -1):
-            self.column_widths["receive"].append(self.receive_list.columnWidth(i))
+        for i in range(self.address_list.columnCount() -1):
+            self.column_widths["receive"].append(self.address_list.columnWidth(i))
 
         self.column_widths["history"] = []
         for i in range(self.history_list.columnCount() - 1):
@@ -1080,24 +1304,51 @@ class ElectrumWindow(QMainWindow):
 
 
     def create_contacts_tab(self):
-        l,w,hbox = self.create_list_tab([_('Address'), _('Label'), _('Tx')])
+        l, w = self.create_list_tab([_('Address'), _('Label'), _('Tx')])
         l.setContextMenuPolicy(Qt.CustomContextMenu)
         l.customContextMenuRequested.connect(self.create_contact_menu)
         for i,width in enumerate(self.column_widths['contacts']):
             l.setColumnWidth(i, width)
-
-        self.connect(l, SIGNAL('itemDoubleClicked(QTreeWidgetItem*, int)'), lambda a, b: self.address_label_clicked(a,b,l,0,1))
-        self.connect(l, SIGNAL('itemChanged(QTreeWidgetItem*, int)'), lambda a,b: self.address_label_changed(a,b,l,0,1))
+        l.itemDoubleClicked.connect(lambda a, b: self.address_label_clicked(a,b,l,0,1))
+        l.itemChanged.connect(lambda a,b: self.address_label_changed(a,b,l,0,1))
         self.contacts_list = l
-        self.contacts_buttons_hbox = hbox
-        hbox.addStretch(1)
         return w
 
 
+    def create_invoices_tab(self):
+        l, w = self.create_list_tab([_('Requestor'), _('Memo'),_('Amount'), _('Status')])
+        l.setColumnWidth(0, 150)
+        h = l.header()
+        h.setStretchLastSection(False)
+        h.setResizeMode(1, QHeaderView.Stretch)
+        l.setContextMenuPolicy(Qt.CustomContextMenu)
+        l.customContextMenuRequested.connect(self.create_invoice_menu)
+        self.invoices_list = l
+        return w
+
+    def update_invoices_tab(self):
+        invoices = self.wallet.storage.get('invoices', {})
+        l = self.invoices_list
+        l.clear()
+        for key, value in invoices.items():
+            try:
+                domain, memo, amount, expiration_date, status, tx_hash = value
+            except:
+                invoices.pop(key)
+                continue
+            if status == PR_UNPAID and expiration_date and expiration_date < time.time():
+                status = PR_EXPIRED
+            item = QTreeWidgetItem( [ domain, memo, self.format_amount(amount), format_status(status)] )
+            l.addTopLevelItem(item)
+
+        l.setCurrentItem(l.topLevelItem(0))
+
+
+
     def delete_imported_key(self, addr):
         if self.question(_("Do you want to remove")+" %s "%addr +_("from your wallet?")):
             self.wallet.delete_imported_key(addr)
-            self.update_receive_tab()
+            self.update_address_tab()
             self.update_history_tab()
 
     def edit_account_label(self, k):
@@ -1105,7 +1356,7 @@ class ElectrumWindow(QMainWindow):
         if ok:
             label = unicode(text)
             self.wallet.set_label(k,label)
-            self.update_receive_tab()
+            self.update_address_tab()
 
     def account_set_expanded(self, item, k, b):
         item.setExpanded(b)
@@ -1118,25 +1369,26 @@ class ElectrumWindow(QMainWindow):
         else:
             menu.addAction(_("Maximize"), lambda: self.account_set_expanded(item, k, True))
         menu.addAction(_("Rename"), lambda: self.edit_account_label(k))
-        menu.addAction(_("View details"), lambda: self.show_account_details(k))
+        if self.wallet.seed_version > 4:
+            menu.addAction(_("View details"), lambda: self.show_account_details(k))
         if self.wallet.account_is_pending(k):
             menu.addAction(_("Delete"), lambda: self.delete_pending_account(k))
-        menu.exec_(self.receive_list.viewport().mapToGlobal(position))
+        menu.exec_(self.address_list.viewport().mapToGlobal(position))
 
     def delete_pending_account(self, k):
         self.wallet.delete_pending_account(k)
-        self.update_receive_tab()
+        self.update_address_tab()
 
     def create_receive_menu(self, position):
         # fixme: this function apparently has a side effect.
         # if it is not called the menu pops up several times
-        #self.receive_list.selectedIndexes()
+        #self.address_list.selectedIndexes()
 
-        selected = self.receive_list.selectedItems()
+        selected = self.address_list.selectedItems()
         multi_select = len(selected) > 1
         addrs = [unicode(item.text(0)) for item in selected]
         if not multi_select:
-            item = self.receive_list.itemAt(position)
+            item = self.address_list.itemAt(position)
             if not item: return
 
             addr = addrs[0]
@@ -1151,12 +1403,14 @@ class ElectrumWindow(QMainWindow):
         menu = QMenu()
         if not multi_select:
             menu.addAction(_("Copy to clipboard"), lambda: self.app.clipboard().setText(addr))
-            menu.addAction(_("QR code"), lambda: self.show_qrcode("bitcoin:" + addr, _("Address")) )
+            menu.addAction(_("Request payment"), lambda: self.receive_at(addr))
             menu.addAction(_("Edit label"), lambda: self.edit_label(True))
-            if self.wallet.seed:
+            menu.addAction(_("Public keys"), lambda: self.show_public_keys(addr))
+            if not self.wallet.is_watching_only():
                 menu.addAction(_("Private key"), lambda: self.show_private_key(addr))
-                menu.addAction(_("Sign message"), lambda: self.sign_verify_message(True,addr))
-            if addr in self.wallet.imported_keys:
+                menu.addAction(_("Sign/verify message"), lambda: self.sign_verify_message(addr))
+                menu.addAction(_("Encrypt/decrypt message"), lambda: self.encrypt_message(addr))
+            if self.wallet.is_imported(addr):
                 menu.addAction(_("Remove from wallet"), lambda: self.delete_imported_key(addr))
 
         if any(addr not in self.wallet.frozen_addresses for addr in addrs):
@@ -1164,22 +1418,27 @@ class ElectrumWindow(QMainWindow):
         if any(addr in self.wallet.frozen_addresses for addr in addrs):
             menu.addAction(_("Unfreeze"), lambda: self.set_addrs_frozen(addrs, False))
 
-        if any(addr not in self.wallet.frozen_addresses for addr in addrs):
+        def can_send(addr):
+            return addr not in self.wallet.frozen_addresses and self.wallet.get_addr_balance(addr) != (0, 0)
+        if any(can_send(addr) for addr in addrs):
             menu.addAction(_("Send From"), lambda: self.send_from_addresses(addrs))
 
         run_hook('receive_menu', menu, addrs)
-        menu.exec_(self.receive_list.viewport().mapToGlobal(position))
+        menu.exec_(self.address_list.viewport().mapToGlobal(position))
 
 
     def get_sendable_balance(self):
-        return sum(sum(self.wallet.get_addr_balance(a)) for a in self.get_payment_sources())
+        return sum(map(lambda x:x['value'], self.get_coins()))
 
 
-    def get_payment_sources(self):
+    def get_coins(self):
         if self.pay_from:
             return self.pay_from
         else:
-            return self.wallet.get_account_addresses(self.current_account)
+            domain = self.wallet.get_account_addresses(self.current_account)
+            for i in self.wallet.frozen_addresses:
+                if i in domain: domain.remove(i)
+            return self.wallet.get_unspent_coins(domain)
 
 
     def send_from_addresses(self, addrs):
@@ -1225,113 +1484,120 @@ class ElectrumWindow(QMainWindow):
         run_hook('create_contact_menu', menu, item)
         menu.exec_(self.contacts_list.viewport().mapToGlobal(position))
 
+    def delete_invoice(self, key):
+        self.invoices.pop(key)
+        self.wallet.storage.put('invoices', self.invoices)
+        self.update_invoices_tab()
+
+    def show_invoice(self, key):
+        from electrum.paymentrequest import PaymentRequest
+        domain, memo, value, expiration, status, tx_hash = self.invoices[key]
+        pr = PaymentRequest(self.config)
+        pr.read_file(key)
+        pr.domain = domain
+        pr.verify()
+        self.show_pr_details(pr)
+
+    def show_pr_details(self, pr):
+        msg = 'Domain: ' + pr.domain
+        msg += '\nStatus: ' + pr.get_status()
+        msg += '\nMemo: ' + pr.get_memo()
+        msg += '\nPayment URL: ' + pr.payment_url
+        msg += '\n\nOutputs:\n' + '\n'.join(map(lambda x: x[0] + ' ' + self.format_amount(x[1])+ self.base_unit(), pr.get_outputs()))
+        QMessageBox.information(self, 'Invoice', msg , 'OK')
+
+    def do_pay_invoice(self, key):
+        from electrum.paymentrequest import PaymentRequest
+        domain, memo, value, expiration, status, tx_hash = self.invoices[key]
+        pr = PaymentRequest(self.config)
+        pr.read_file(key)
+        pr.domain = domain
+        self.payment_request = pr
+        self.prepare_for_payment_request()
+        if pr.verify():
+            self.payment_request_ok()
+        else:
+            self.payment_request_error()
+            
 
-    def update_receive_item(self, item):
-        item.setFont(0, QFont(MONOSPACE_FONT))
-        address = str(item.data(0,0).toString())
-        label = self.wallet.labels.get(address,'')
-        item.setData(1,0,label)
-        item.setData(0,32, True) # is editable
-
-        run_hook('update_receive_item', address, item)
-
-        if not self.wallet.is_mine(address): return
-
-        c, u = self.wallet.get_addr_balance(address)
-        balance = self.format_amount(c + u)
-        item.setData(2,0,balance)
+    def create_invoice_menu(self, position):
+        item = self.invoices_list.itemAt(position)
+        if not item:
+            return
+        k = self.invoices_list.indexOfTopLevelItem(item)
+        key = self.invoices.keys()[k]
+        domain, memo, value, expiration, status, tx_hash = self.invoices[key]
+        menu = QMenu()
+        menu.addAction(_("Details"), lambda: self.show_invoice(key))
+        if status == PR_UNPAID:
+            menu.addAction(_("Pay Now"), lambda: self.do_pay_invoice(key))
+        menu.addAction(_("Delete"), lambda: self.delete_invoice(key))
+        menu.exec_(self.invoices_list.viewport().mapToGlobal(position))
 
-        if address in self.wallet.frozen_addresses:
-            item.setBackgroundColor(0, QColor('lightblue'))
 
 
-    def update_receive_tab(self):
-        l = self.receive_list
+    def update_address_tab(self):
+        l = self.address_list
+        # extend the syntax for consistency
+        l.addChild = l.addTopLevelItem
+        l.insertChild = l.insertTopLevelItem
 
         l.clear()
-        l.setColumnHidden(2, False)
-        l.setColumnHidden(3, False)
-        for i,width in enumerate(self.column_widths['receive']):
-            l.setColumnWidth(i, width)
 
+        accounts = self.wallet.get_accounts()
         if self.current_account is None:
-            account_items = self.wallet.accounts.items()
-        elif self.current_account != -1:
-            account_items = [(self.current_account, self.wallet.accounts.get(self.current_account))]
+            account_items = sorted(accounts.items())
         else:
-            account_items = []
+            account_items = [(self.current_account, accounts.get(self.current_account))]
+
 
         for k, account in account_items:
-            name = self.wallet.get_account_name(k)
-            c,u = self.wallet.get_account_balance(k)
-            account_item = QTreeWidgetItem( [ name, '', self.format_amount(c+u), ''] )
-            l.addTopLevelItem(account_item)
-            account_item.setExpanded(self.accounts_expanded.get(k, True))
-            account_item.setData(0, 32, k)
-
-            if not self.wallet.is_seeded(k):
-                icon = QIcon(":icons/key.png")
-                account_item.setIcon(0, icon)
-
-            for is_change in ([0,1]):
-                name = _("Receiving") if not is_change else _("Change")
-                seq_item = QTreeWidgetItem( [ name, '', '', '', ''] )
-                account_item.addChild(seq_item)
+
+            if len(accounts) > 1:
+                name = self.wallet.get_account_name(k)
+                c,u = self.wallet.get_account_balance(k)
+                account_item = QTreeWidgetItem( [ name, '', self.format_amount(c+u), ''] )
+                l.addTopLevelItem(account_item)
+                account_item.setExpanded(self.accounts_expanded.get(k, True))
+                account_item.setData(0, 32, k)
+            else:
+                account_item = l
+
+            sequences = [0,1] if account.has_change() else [0]
+            for is_change in sequences:
+                if len(sequences) > 1:
+                    name = _("Receiving") if not is_change else _("Change")
+                    seq_item = QTreeWidgetItem( [ name, '', '', '', ''] )
+                    account_item.addChild(seq_item)
+                    if not is_change: 
+                        seq_item.setExpanded(True)
+                else:
+                    seq_item = account_item
+                    
                 used_item = QTreeWidgetItem( [ _("Used"), '', '', '', ''] )
                 used_flag = False
-                if not is_change: seq_item.setExpanded(True)
-
-                is_red = False
-                gap = 0
-
-                for address in account.get_addresses(is_change):
-                    h = self.wallet.history.get(address,[])
-
-                    if h == []:
-                        gap += 1
-                        if gap > self.wallet.gap_limit:
-                            is_red = True
-                    else:
-                        gap = 0
 
+                addr_list = account.get_addresses(is_change)
+                for address in addr_list:
+                    num, is_used = self.wallet.is_used(address)
+                    label = self.wallet.labels.get(address,'')
                     c, u = self.wallet.get_addr_balance(address)
-                    num_tx = '*' if h == ['*'] else "%d"%len(h)
-                    item = QTreeWidgetItem( [ address, '', '', num_tx] )
-                    self.update_receive_item(item)
-                    if is_red:
-                        item.setBackgroundColor(1, QColor('red'))
-                    if len(h) > 0 and c == -u:
+                    balance = self.format_amount(c + u)
+                    item = QTreeWidgetItem( [ address, label, balance, "%d"%num] )
+                    item.setFont(0, QFont(MONOSPACE_FONT))
+                    item.setData(0, 32, True) # label can be edited
+                    if address in self.wallet.frozen_addresses:
+                        item.setBackgroundColor(0, QColor('lightblue'))
+                    if self.wallet.is_beyond_limit(address, account, is_change):
+                        item.setBackgroundColor(0, QColor('red'))
+                    if is_used:
                         if not used_flag:
-                            seq_item.insertChild(0,used_item)
+                            seq_item.insertChild(0, used_item)
                             used_flag = True
                         used_item.addChild(item)
                     else:
                         seq_item.addChild(item)
 
-
-        for k, addr in self.wallet.get_pending_accounts():
-            name = self.wallet.labels.get(k,'')
-            account_item = QTreeWidgetItem( [ name + "  [ "+_('pending account')+" ]", '', '', ''] )
-            self.update_receive_item(item)
-            l.addTopLevelItem(account_item)
-            account_item.setExpanded(True)
-            account_item.setData(0, 32, k)
-            item = QTreeWidgetItem( [ addr, '', '', '', ''] )
-            account_item.addChild(item)
-            self.update_receive_item(item)
-
-
-        if self.wallet.imported_keys and (self.current_account is None or self.current_account == -1):
-            c,u = self.wallet.get_imported_balance()
-            account_item = QTreeWidgetItem( [ _('Imported'), '', self.format_amount(c+u), ''] )
-            l.addTopLevelItem(account_item)
-            account_item.setExpanded(True)
-            for address in self.wallet.imported_keys.keys():
-                item = QTreeWidgetItem( [ address, '', '', ''] )
-                self.update_receive_item(item)
-                account_item.addChild(item)
-
-
         # we use column 1 because column 0 may be hidden
         l.setCurrentItem(l.topLevelItem(0),1)
 
@@ -1355,7 +1621,6 @@ class ElectrumWindow(QMainWindow):
         l.setCurrentItem(l.topLevelItem(0))
 
 
-
     def create_console_tab(self):
         from console import Console
         self.console = console = Console()
@@ -1391,6 +1656,7 @@ class ElectrumWindow(QMainWindow):
                     self.current_account = k
         self.update_history_tab()
         self.update_status()
+        self.update_address_tab()
         self.update_receive_tab()
 
     def create_status_bar(self):
@@ -1406,6 +1672,7 @@ class ElectrumWindow(QMainWindow):
         self.updatelabel = UpdateLabel(self.config, sb)
 
         self.account_selector = QComboBox()
+        self.account_selector.setSizeAdjustPolicy(QComboBox.AdjustToContents)
         self.connect(self.account_selector,SIGNAL("activated(QString)"),self.change_account)
         sb.addPermanentWidget(self.account_selector)
 
@@ -1433,13 +1700,16 @@ class ElectrumWindow(QMainWindow):
 
 
     def update_buttons_on_seed(self):
-        if not self.wallet.is_watching_only():
+        if self.wallet.has_seed():
            self.seed_button.show()
+        else:
+           self.seed_button.hide()
+
+        if not self.wallet.is_watching_only():
            self.password_button.show()
            self.send_button.setText(_("Send"))
         else:
            self.password_button.hide()
-           self.seed_button.hide()
            self.send_button.setText(_("Create unsigned transaction"))
 
 
@@ -1453,6 +1723,7 @@ class ElectrumWindow(QMainWindow):
     def new_contact_dialog(self):
 
         d = QDialog(self)
+        d.setWindowTitle(_("New Contact"))
         vbox = QVBoxLayout(d)
         vbox.addWidget(QLabel(_('New Contact')+':'))
 
@@ -1487,7 +1758,8 @@ class ElectrumWindow(QMainWindow):
         self.tabs.setCurrentIndex(3)
 
 
-    def new_account_dialog(self):
+    @protected
+    def new_account_dialog(self, password):
 
         dialog = QDialog(self)
         dialog.setModal(1)
@@ -1511,88 +1783,30 @@ class ElectrumWindow(QMainWindow):
         name = str(e.text())
         if not name: return
 
-        self.wallet.create_pending_account('1', name)
-        self.update_receive_tab()
-        self.tabs.setCurrentIndex(2)
-
-
-
-    def show_master_public_key_old(self):
-        dialog = QDialog(self)
-        dialog.setModal(1)
-        dialog.setWindowTitle(_("Master Public Key"))
-
-        main_text = QTextEdit()
-        main_text.setText(self.wallet.get_master_public_key())
-        main_text.setReadOnly(True)
-        main_text.setMaximumHeight(170)
-        qrw = QRCodeWidget(self.wallet.get_master_public_key())
-
-        ok_button = QPushButton(_("OK"))
-        ok_button.setDefault(True)
-        ok_button.clicked.connect(dialog.accept)
-
-        main_layout = QGridLayout()
-        main_layout.addWidget(QLabel(_('Your Master Public Key is:')), 0, 0, 1, 2)
-
-        main_layout.addWidget(main_text, 1, 0)
-        main_layout.addWidget(qrw, 1, 1 )
+        self.wallet.create_pending_account(name, password)
+        self.update_address_tab()
+        self.tabs.setCurrentIndex(3)
 
-        vbox = QVBoxLayout()
-        vbox.addLayout(main_layout)
-        vbox.addLayout(close_button(dialog))
-        dialog.setLayout(vbox)
-        dialog.exec_()
 
 
-    def show_master_public_key(self):
 
-        if self.wallet.seed_version == 4:
-            self.show_master_public_key_old()
-            return
+    def show_master_public_keys(self):
 
         dialog = QDialog(self)
         dialog.setModal(1)
         dialog.setWindowTitle(_("Master Public Keys"))
 
-        chain_text = QTextEdit()
-        chain_text.setReadOnly(True)
-        chain_text.setMaximumHeight(170)
-        chain_qrw = QRCodeWidget()
-
-        mpk_text = QTextEdit()
-        mpk_text.setReadOnly(True)
-        mpk_text.setMaximumHeight(170)
-        mpk_qrw = QRCodeWidget()
-
         main_layout = QGridLayout()
-
-        main_layout.addWidget(QLabel(_('Key')), 1, 0)
-        main_layout.addWidget(mpk_text, 1, 1)
-        main_layout.addWidget(mpk_qrw, 1, 2)
-
-        main_layout.addWidget(QLabel(_('Chain')), 2, 0)
-        main_layout.addWidget(chain_text, 2, 1)
-        main_layout.addWidget(chain_qrw, 2, 2)
-
-        def update(key):
-            c, K, cK = self.wallet.master_public_keys[str(key)]
-            chain_text.setText(c)
-            chain_qrw.set_addr(c)
-            chain_qrw.update_qr()
-            mpk_text.setText(K)
-            mpk_qrw.set_addr(K)
-            mpk_qrw.update_qr()
-
-        key_selector = QComboBox()
-        keys = sorted(self.wallet.master_public_keys.keys())
-        key_selector.addItems(keys)
-
-        main_layout.addWidget(QLabel(_('Derivation:')), 0, 0)
-        main_layout.addWidget(key_selector, 0, 1)
-        dialog.connect(key_selector,SIGNAL("activated(QString)"),update)
-
-        update(keys[0])
+        mpk_dict = self.wallet.get_master_public_keys()
+        i = 0
+        for key, value in mpk_dict.items():
+            main_layout.addWidget(QLabel(key), i, 0)
+            mpk_text = QTextEdit()
+            mpk_text.setReadOnly(True)
+            mpk_text.setMaximumHeight(170)
+            mpk_text.setText(value)
+            main_layout.addWidget(mpk_text, i + 1, 0)
+            i += 2
 
         vbox = QVBoxLayout()
         vbox.addLayout(main_layout)
@@ -1604,71 +1818,25 @@ class ElectrumWindow(QMainWindow):
 
     @protected
     def show_seed_dialog(self, password):
-        if self.wallet.is_watching_only():
-            QMessageBox.information(self, _('Message'), _('This is a watching-only wallet'), _('OK'))
+        if not self.wallet.has_seed():
+            QMessageBox.information(self, _('Message'), _('This wallet has no seed'), _('OK'))
             return
 
-        if self.wallet.seed:
-            try:
-                mnemonic = self.wallet.get_mnemonic(password)
-            except Exception:
-                QMessageBox.warning(self, _('Error'), _('Incorrect Password'), _('OK'))
-                return
-            from seed_dialog import SeedDialog
-            d = SeedDialog(self, mnemonic, self.wallet.imported_keys)
-            d.exec_()
-        else:
-            l = {}
-            for k in self.wallet.master_private_keys.keys():
-                pk = self.wallet.get_master_private_key(k, password)
-                l[k] = pk
-            from seed_dialog import PrivateKeysDialog
-            d = PrivateKeysDialog(self,l)
-            d.exec_()
-
-
+        try:
+            mnemonic = self.wallet.get_mnemonic(password)
+        except Exception:
+            QMessageBox.warning(self, _('Error'), _('Incorrect Password'), _('OK'))
+            return
+        from seed_dialog import SeedDialog
+        d = SeedDialog(self, mnemonic, self.wallet.has_imported_keys())
+        d.exec_()
 
 
 
     def show_qrcode(self, data, title = _("QR code")):
-        if not data: return
-        d = QDialog(self)
-        d.setModal(1)
-        d.setWindowTitle(title)
-        d.setMinimumSize(270, 300)
-        vbox = QVBoxLayout()
-        qrw = QRCodeWidget(data)
-        vbox.addWidget(qrw, 1)
-        vbox.addWidget(QLabel(data), 0, Qt.AlignHCenter)
-        hbox = QHBoxLayout()
-        hbox.addStretch(1)
-
-        filename = os.path.join(self.config.path, "qrcode.bmp")
-
-        def print_qr():
-            bmp.save_qrcode(qrw.qr, filename)
-            QMessageBox.information(None, _('Message'), _("QR code saved to file") + " " + filename, _('OK'))
-
-        def copy_to_clipboard():
-            bmp.save_qrcode(qrw.qr, filename)
-            self.app.clipboard().setImage(QImage(filename))
-            QMessageBox.information(None, _('Message'), _("QR code saved to clipboard"), _('OK'))
-
-        b = QPushButton(_("Copy"))
-        hbox.addWidget(b)
-        b.clicked.connect(copy_to_clipboard)
-
-        b = QPushButton(_("Save"))
-        hbox.addWidget(b)
-        b.clicked.connect(print_qr)
-
-        b = QPushButton(_("Close"))
-        hbox.addWidget(b)
-        b.clicked.connect(d.accept)
-        b.setDefault(True)
-
-        vbox.addLayout(hbox)
-        d.setLayout(vbox)
+        if not data: 
+            return
+        d = QRDialog(data, self, title)
         d.exec_()
 
 
@@ -1687,12 +1855,36 @@ class ElectrumWindow(QMainWindow):
         apply( func, args)
 
 
+    def show_public_keys(self, address):
+        if not address: return
+        try:
+            pubkey_list = self.wallet.get_public_keys(address)
+        except Exception as e:
+            traceback.print_exc(file=sys.stdout)
+            self.show_message(str(e))
+            return
+
+        d = QDialog(self)
+        d.setMinimumSize(600, 200)
+        d.setModal(1)
+        vbox = QVBoxLayout()
+        vbox.addWidget( QLabel(_("Address") + ': ' + address))
+        vbox.addWidget( QLabel(_("Public key") + ':'))
+        keys = QRTextEdit()
+        keys.setReadOnly(True)
+        keys.setText('\n'.join(pubkey_list))
+        vbox.addWidget(keys)
+        vbox.addLayout(close_button(d))
+        d.setLayout(vbox)
+        d.exec_()
+
     @protected
     def show_private_key(self, address, password):
         if not address: return
         try:
             pk_list = self.wallet.get_private_key(address, password)
         except Exception as e:
+            traceback.print_exc(file=sys.stdout)
             self.show_message(str(e))
             return
 
@@ -1702,11 +1894,10 @@ class ElectrumWindow(QMainWindow):
         vbox = QVBoxLayout()
         vbox.addWidget( QLabel(_("Address") + ': ' + address))
         vbox.addWidget( QLabel(_("Private key") + ':'))
-        keys = QTextEdit()
+        keys = QRTextEdit()
         keys.setReadOnly(True)
         keys.setText('\n'.join(pk_list))
         vbox.addWidget(keys)
-        vbox.addWidget( QRCodeWidget('\n'.join(pk_list)) )
         vbox.addLayout(close_button(d))
         d.setLayout(vbox)
         d.exec_()
@@ -1731,41 +1922,104 @@ class ElectrumWindow(QMainWindow):
             self.show_message(_("Error: wrong signature"))
 
 
-    def sign_verify_message(self, sign, address=''):
-        if sign and not address: return
+    def sign_verify_message(self, address=''):
         d = QDialog(self)
         d.setModal(1)
-        d.setWindowTitle(_('Sign Message') if sign else _('Verify Message'))
+        d.setWindowTitle(_('Sign/verify Message'))
         d.setMinimumSize(410, 290)
 
         layout = QGridLayout(d)
 
-        address_e = QLineEdit()
-        address_e.setText(address)
-        layout.addWidget(QLabel(_('Address')), 1, 0)
-        layout.addWidget(address_e, 1, 1)
-
         message_e = QTextEdit()
-        layout.addWidget(QLabel(_('Message')), 2, 0)
-        layout.addWidget(message_e, 2, 1)
+        layout.addWidget(QLabel(_('Message')), 1, 0)
+        layout.addWidget(message_e, 1, 1)
         layout.setRowStretch(2,3)
 
+        address_e = QLineEdit()
+        address_e.setText(address)
+        layout.addWidget(QLabel(_('Address')), 2, 0)
+        layout.addWidget(address_e, 2, 1)
+
         signature_e = QTextEdit()
         layout.addWidget(QLabel(_('Signature')), 3, 0)
         layout.addWidget(signature_e, 3, 1)
         layout.setRowStretch(3,1)
 
         hbox = QHBoxLayout()
-        if sign:
-            b = QPushButton(_("Sign"))
-        elif not sign:
-            b = QPushButton(_("Verify"))
+
+        b = QPushButton(_("Sign"))
+        b.clicked.connect(lambda: self.do_sign(address_e, message_e, signature_e))
+        hbox.addWidget(b)
+
+        b = QPushButton(_("Verify"))
+        b.clicked.connect(lambda: self.do_verify(address_e, message_e, signature_e))
+        hbox.addWidget(b)
+
+        b = QPushButton(_("Close"))
+        b.clicked.connect(d.accept)
+        hbox.addWidget(b)
+        layout.addLayout(hbox, 4, 1)
+        d.exec_()
+
+
+    @protected
+    def do_decrypt(self, message_e, pubkey_e, encrypted_e, password):
+        try:
+            decrypted = self.wallet.decrypt_message(str(pubkey_e.text()), str(encrypted_e.toPlainText()), password)
+            message_e.setText(decrypted)
+        except Exception as e:
+            self.show_message(str(e))
+
+
+    def do_encrypt(self, message_e, pubkey_e, encrypted_e):
+        message = unicode(message_e.toPlainText())
+        message = message.encode('utf-8')
+        try:
+            encrypted = bitcoin.encrypt_message(message, str(pubkey_e.text()))
+            encrypted_e.setText(encrypted)
+        except Exception as e:
+            self.show_message(str(e))
+
+
+
+    def encrypt_message(self, address = ''):
+        d = QDialog(self)
+        d.setModal(1)
+        d.setWindowTitle(_('Encrypt/decrypt Message'))
+        d.setMinimumSize(610, 490)
+
+        layout = QGridLayout(d)
+
+        message_e = QTextEdit()
+        layout.addWidget(QLabel(_('Message')), 1, 0)
+        layout.addWidget(message_e, 1, 1)
+        layout.setRowStretch(2,3)
+
+        pubkey_e = QLineEdit()
+        if address:
+            pubkey = self.wallet.get_public_keys(address)[0]
+            pubkey_e.setText(pubkey)
+        layout.addWidget(QLabel(_('Public key')), 2, 0)
+        layout.addWidget(pubkey_e, 2, 1)
+
+        encrypted_e = QTextEdit()
+        layout.addWidget(QLabel(_('Encrypted')), 3, 0)
+        layout.addWidget(encrypted_e, 3, 1)
+        layout.setRowStretch(3,1)
+
+        hbox = QHBoxLayout()
+        b = QPushButton(_("Encrypt"))
+        b.clicked.connect(lambda: self.do_encrypt(message_e, pubkey_e, encrypted_e))
+        hbox.addWidget(b)
+
+        b = QPushButton(_("Decrypt"))
+        b.clicked.connect(lambda: self.do_decrypt(message_e, pubkey_e, encrypted_e))
         hbox.addWidget(b)
-        f = self.do_sign if sign else self.do_verify
-        b.clicked.connect(lambda: f(address_e, message_e, signature_e))
+
         b = QPushButton(_("Close"))
         b.clicked.connect(d.accept)
         hbox.addWidget(b)
+
         layout.addLayout(hbox, 4, 1)
         d.exec_()
 
@@ -1776,15 +2030,17 @@ class ElectrumWindow(QMainWindow):
     def show_message(self, msg):
         QMessageBox.information(self, _('Message'), msg, _('OK'))
 
-    def password_dialog(self ):
+    def password_dialog(self, msg=None):
         d = QDialog(self)
         d.setModal(1)
+        d.setWindowTitle(_("Enter Password"))
 
         pw = QLineEdit()
         pw.setEchoMode(2)
 
         vbox = QVBoxLayout()
-        msg = _('Please enter your password')
+        if not msg:
+            msg = _('Please enter your password')
         vbox.addWidget(QLabel(msg))
 
         grid = QGridLayout()
@@ -1811,26 +2067,45 @@ class ElectrumWindow(QMainWindow):
         "json or raw hexadecimal"
         try:
             txt.decode('hex')
-            tx = Transaction(txt)
-            return tx
-        except Exception:
-            pass
+            is_hex = True
+        except:
+            is_hex = False
+
+        if is_hex:
+            try:
+                return Transaction.deserialize(txt)
+            except:
+                traceback.print_exc(file=sys.stdout)
+                QMessageBox.critical(None, _("Unable to parse transaction"), _("Electrum was unable to parse your transaction"))
+                return
 
         try:
             tx_dict = json.loads(str(txt))
             assert "hex" in tx_dict.keys()
-            assert "complete" in tx_dict.keys()
-            tx = Transaction(tx_dict["hex"], tx_dict["complete"])
-            if not tx_dict["complete"]:
-                assert "input_info" in tx_dict.keys()
-                input_info = json.loads(tx_dict['input_info'])
-                tx.add_input_info(input_info)
+            tx = Transaction.deserialize(tx_dict["hex"])
+            #if tx_dict.has_key("input_info"):
+            #    input_info = json.loads(tx_dict['input_info'])
+            #    tx.add_input_info(input_info)
             return tx
         except Exception:
-            pass
+            traceback.print_exc(file=sys.stdout)
+            QMessageBox.critical(None, _("Unable to parse transaction"), _("Electrum was unable to parse your transaction"))
 
-        QMessageBox.critical(None, _("Unable to parse transaction"), _("Electrum was unable to parse your transaction"))
 
+    def read_tx_from_qrcode(self):
+        data = run_hook('scan_qr_hook')
+        if not data:
+            return
+        # transactions are binary, but qrcode seems to return utf8...
+        z = data.decode('utf8')
+        s = ''
+        for b in z:
+            s += chr(ord(b))
+        data = s.encode('hex')
+        tx = self.tx_from_text(data)
+        if not tx:
+            return
+        self.show_transaction(tx)
 
 
     def read_tx_from_file(self):
@@ -1847,8 +2122,12 @@ class ElectrumWindow(QMainWindow):
 
 
     @protected
-    def sign_raw_transaction(self, tx, input_info, password):
-        self.wallet.signrawtransaction(tx, input_info, [], password)
+    def sign_raw_transaction(self, tx, password):
+        try:
+            self.wallet.signrawtransaction(tx, [], password)
+        except Exception as e:
+            traceback.print_exc(file=sys.stdout)
+            QMessageBox.warning(self, _("Error"), str(e))
 
     def do_process_from_text(self):
         text = text_dialog(self, _('Input raw transaction'), _("Transaction:"), _("Load transaction"))
@@ -1869,7 +2148,7 @@ class ElectrumWindow(QMainWindow):
         if ok and txid:
             r = self.network.synchronous_get([ ('blockchain.transaction.get',[str(txid)]) ])[0]
             if r:
-                tx = transaction.Transaction(r)
+                tx = transaction.Transaction.deserialize(r)
                 if tx:
                     self.show_transaction(tx)
                 else:
@@ -1882,12 +2161,12 @@ class ElectrumWindow(QMainWindow):
         try:
             for position, row in enumerate(csvReader):
                 address = row[0]
-                if not is_valid(address):
+                if not is_address(address):
                     errors.append((position, address))
                     continue
                 amount = Decimal(row[1])
                 amount = int(100000000*amount)
-                outputs.append((address, amount))
+                outputs.append(('address', address, amount))
         except (ValueError, IOError, os.error), reason:
             QMessageBox.critical(None, _("Unable to read file or no transaction found"), _("Electrum was unable to open your transaction file") + "\n" + str(reason))
             return
@@ -1929,36 +2208,86 @@ class ElectrumWindow(QMainWindow):
 
 
     @protected
-    def do_export_privkeys(self, password):
-        if not self.wallet.seed:
-            self.show_message(_("This wallet has no seed"))
+    def export_privkeys_dialog(self, password):
+        if self.wallet.is_watching_only():
+            self.show_message(_("This is a watching-only wallet"))
             return
 
-        self.show_message("%s\n%s\n%s" % (_("WARNING: ALL your private keys are secret."),  _("Exposing a single private key can compromise your entire wallet!"), _("In particular, DO NOT use 'redeem private key' services proposed by third parties.")))
+        d = QDialog(self)
+        d.setWindowTitle(_('Private keys'))
+        d.setMinimumSize(850, 300)
+        vbox = QVBoxLayout(d)
 
-        try:
-            select_export = _('Select file to export your private keys to')
-            fileName = self.getSaveFileName(select_export, 'electrum-private-keys.csv', "*.csv")
-            if fileName:
-                with open(fileName, "w+") as csvfile:
-                    transaction = csv.writer(csvfile)
-                    transaction.writerow(["address", "private_key"])
+        msg = "%s\n%s\n%s" % (_("WARNING: ALL your private keys are secret."), 
+                              _("Exposing a single private key can compromise your entire wallet!"), 
+                              _("In particular, DO NOT use 'redeem private key' services proposed by third parties."))
+        vbox.addWidget(QLabel(msg))
 
-                    addresses = self.wallet.addresses(True)
+        e = QTextEdit()
+        e.setReadOnly(True)
+        vbox.addWidget(e)
+
+        defaultname = 'electrum-private-keys.csv'
+        select_msg = _('Select file to export your private keys to')
+        hbox, filename_e, csv_button = filename_field(self, self.config, defaultname, select_msg)
+        vbox.addLayout(hbox)
 
-                    for addr in addresses:
-                        pk = "".join(self.wallet.get_private_key(addr, password))
-                        transaction.writerow(["%34s"%addr,pk])
+        h, b = ok_cancel_buttons2(d, _('Export'))
+        b.setEnabled(False)
+        vbox.addLayout(h)
+
+        private_keys = {}
+        addresses = self.wallet.addresses(True)
+        done = False
+        def privkeys_thread():
+            for addr in addresses:
+                time.sleep(0.1)
+                if done: 
+                    break
+                private_keys[addr] = "\n".join(self.wallet.get_private_key(addr, password))
+                d.emit(SIGNAL('computing_privkeys'))
+            d.emit(SIGNAL('show_privkeys'))
+
+        def show_privkeys():
+            s = "\n".join( map( lambda x: x[0] + "\t"+ x[1], private_keys.items()))
+            e.setText(s)
+            b.setEnabled(True)
+
+        d.connect(d, QtCore.SIGNAL('computing_privkeys'), lambda: e.setText("Please wait... %d/%d"%(len(private_keys),len(addresses))))
+        d.connect(d, QtCore.SIGNAL('show_privkeys'), show_privkeys)
+        threading.Thread(target=privkeys_thread).start()
 
-                    self.show_message(_("Private keys exported."))
+        if not d.exec_():
+            done = True
+            return
+
+        filename = filename_e.text()
+        if not filename:
+            return
 
+        try:
+            self.do_export_privkeys(filename, private_keys, csv_button.isChecked())
         except (IOError, os.error), reason:
             export_error_label = _("Electrum was unable to produce a private key-export.")
             QMessageBox.critical(None, _("Unable to create csv"), export_error_label + "\n" + str(reason))
 
         except Exception as e:
-          self.show_message(str(e))
-          return
+            self.show_message(str(e))
+            return
+
+        self.show_message(_("Private keys exported."))
+
+
+    def do_export_privkeys(self, fileName, pklist, is_csv):
+        with open(fileName, "w+") as f:
+            if is_csv:
+                transaction = csv.writer(f)
+                transaction.writerow(["address", "private_key"])
+                for addr, pk in pklist.items():
+                    transaction.writerow(["%34s"%addr,pk])
+            else:
+                import json
+                f.write(json.dumps(pklist, indent = 4))
 
 
     def do_import_labels(self):
@@ -1987,14 +2316,134 @@ class ElectrumWindow(QMainWindow):
             QMessageBox.critical(None, _("Unable to export labels"), _("Electrum was unable to export your labels.")+"\n" + str(reason))
 
 
-    def do_export_history(self):
-        from lite_window import csv_transaction
-        csv_transaction(self.wallet)
+    def export_history_dialog(self):
+
+        d = QDialog(self)
+        d.setWindowTitle(_('Export History'))
+        d.setMinimumSize(400, 200)
+        vbox = QVBoxLayout(d)
+
+        defaultname = os.path.expanduser('~/electrum-history.csv')
+        select_msg = _('Select file to export your wallet transactions to')
+
+        hbox, filename_e, csv_button = filename_field(self, self.config, defaultname, select_msg)
+        vbox.addLayout(hbox)
+
+        vbox.addStretch(1)
+
+        h, b = ok_cancel_buttons2(d, _('Export'))
+        vbox.addLayout(h)
+        if not d.exec_():
+            return
+
+        filename = filename_e.text()
+        if not filename:
+            return
+
+        try:
+            self.do_export_history(self.wallet, filename, csv_button.isChecked())
+        except (IOError, os.error), reason:
+            export_error_label = _("Electrum was unable to produce a transaction export.")
+            QMessageBox.critical(self, _("Unable to export history"), export_error_label + "\n" + str(reason))
+            return
+
+        QMessageBox.information(self,_("History exported"), _("Your wallet history has been successfully exported."))
+
+
+    def do_export_history(self, wallet, fileName, is_csv):
+        history = wallet.get_tx_history()
+        lines = []
+        for item in history:
+            tx_hash, confirmations, is_mine, value, fee, balance, timestamp = item
+            if confirmations:
+                if timestamp is not None:
+                    try:
+                        time_string = datetime.datetime.fromtimestamp(timestamp).isoformat(' ')[:-3]
+                    except [RuntimeError, TypeError, NameError] as reason:
+                        time_string = "unknown"
+                        pass
+                else:
+                    time_string = "unknown"
+            else:
+                time_string = "pending"
+
+            if value is not None:
+                value_string = format_satoshis(value, True)
+            else:
+                value_string = '--'
+
+            if fee is not None:
+                fee_string = format_satoshis(fee, True)
+            else:
+                fee_string = '0'
+
+            if tx_hash:
+                label, is_default_label = wallet.get_label(tx_hash)
+                label = label.encode('utf-8')
+            else:
+                label = ""
+
+            balance_string = format_satoshis(balance, False)
+            if is_csv:
+                lines.append([tx_hash, label, confirmations, value_string, fee_string, balance_string, time_string])
+            else:
+                lines.append({'txid':tx_hash, 'date':"%16s"%time_string, 'label':label, 'value':value_string})
+
+        with open(fileName, "w+") as f:
+            if is_csv:
+                transaction = csv.writer(f)
+                transaction.writerow(["transaction_hash","label", "confirmations", "value", "fee", "balance", "timestamp"])
+                for line in lines:
+                    transaction.writerow(line)
+            else:
+                import json
+                f.write(json.dumps(lines, indent = 4))
+
+
+    def sweep_key_dialog(self):
+        d = QDialog(self)
+        d.setWindowTitle(_('Sweep private keys'))
+        d.setMinimumSize(600, 300)
+
+        vbox = QVBoxLayout(d)
+        vbox.addWidget(QLabel(_("Enter private keys")))
+
+        keys_e = QTextEdit()
+        keys_e.setTabChangesFocus(True)
+        vbox.addWidget(keys_e)
+
+        h, address_e = address_field(self.wallet.addresses())
+        vbox.addLayout(h)
+
+        vbox.addStretch(1)
+        hbox, button = ok_cancel_buttons2(d, _('Sweep'))
+        vbox.addLayout(hbox)
+        button.setEnabled(False)
+
+        def get_address():
+            addr = str(address_e.text())
+            if bitcoin.is_address(addr):
+                return addr
+
+        def get_pk():
+            pk = str(keys_e.toPlainText()).strip()
+            if Wallet.is_private_key(pk):
+                return pk.split()
+
+        f = lambda: button.setEnabled(get_address() is not None and get_pk() is not None)
+        keys_e.textChanged.connect(f)
+        address_e.textChanged.connect(f)
+        if not d.exec_():
+            return
+
+        fee = self.wallet.fee
+        tx = Transaction.sweep(get_pk(), self.network, get_address(), fee)
+        self.show_transaction(tx)
 
 
     @protected
     def do_import_privkey(self, password):
-        if not self.wallet.imported_keys:
+        if not self.wallet.has_imported_keys():
             r = QMessageBox.question(None, _('Warning'), '<b>'+_('Warning') +':\n</b><br/>'+ _('Imported keys are not recoverable from seed.') + ' ' \
                                          + _('If you ever need to restore your wallet from its seed, these keys will be lost.') + '<p>' \
                                          + _('Are you sure you understand what you are doing?'), 3, 4)
@@ -2020,7 +2469,7 @@ class ElectrumWindow(QMainWindow):
             QMessageBox.information(self, _('Information'), _("The following addresses were added") + ':\n' + '\n'.join(addrlist))
         if badkeys:
             QMessageBox.critical(self, _('Error'), _("The following inputs could not be imported") + ':\n'+ '\n'.join(badkeys))
-        self.update_receive_tab()
+        self.update_address_tab()
         self.update_history_tab()
 
 
@@ -2060,16 +2509,16 @@ class ElectrumWindow(QMainWindow):
 
         fee_label = QLabel(_('Transaction fee') + ':')
         grid.addWidget(fee_label, 2, 0)
-        fee_e = AmountEdit(self.base_unit)
-        fee_e.setText(self.format_amount(self.wallet.fee).strip())
+        fee_e = BTCAmountEdit(self.get_decimal_point)
+        fee_e.setAmount(self.wallet.fee)
         grid.addWidget(fee_e, 2, 1)
-        msg = _('Fee per kilobyte of transaction.') + ' ' \
-            + _('Recommended value') + ': ' + self.format_amount(20000)
+        msg = _('Fee per kilobyte of transaction.') + '\n' \
+            + _('Recommended value') + ': ' + self.format_amount(10000) + ' ' + self.base_unit()
         grid.addWidget(HelpButton(msg), 2, 2)
         if not self.config.is_modifiable('fee_per_kb'):
             for w in [fee_e, fee_label]: w.setEnabled(False)
 
-        units = ['BTC', 'mBTC']
+        units = ['BTC', 'mBTC', 'bits']
         unit_label = QLabel(_('Base unit') + ':')
         grid.addWidget(unit_label, 3, 0)
         unit_combo = QComboBox()
@@ -2086,19 +2535,31 @@ class ElectrumWindow(QMainWindow):
         grid.addWidget(HelpButton(_('Using change addresses makes it more difficult for other people to track your transactions.')+' '), 4, 2)
         if not self.config.is_modifiable('use_change'): usechange_cb.setEnabled(False)
 
-        grid.setRowStretch(5,1)
+        block_explorers = ['Blockchain.info', 'Blockr.io', 'Insight.is']
+        block_ex_label = QLabel(_('Online Block Explorer') + ':')
+        grid.addWidget(block_ex_label, 5, 0)
+        block_ex_combo = QComboBox()
+        block_ex_combo.addItems(block_explorers)
+        block_ex_combo.setCurrentIndex(block_explorers.index(self.config.get('block_explorer', 'Blockchain.info')))
+        grid.addWidget(block_ex_combo, 5, 1)
+        grid.addWidget(HelpButton(_('Choose which online block explorer to use for functions that open a web browser')+' '), 5, 2)
+
+        show_tx = self.config.get('show_before_broadcast', False)
+        showtx_cb = QCheckBox(_('Show before broadcast'))
+        showtx_cb.setChecked(show_tx)
+        grid.addWidget(showtx_cb, 6, 0)
+        grid.addWidget(HelpButton(_('Display the details of your transactions before broadcasting it.')), 6, 2)
 
         vbox.addLayout(grid)
+        vbox.addStretch(1)
         vbox.addLayout(ok_cancel_buttons(d))
         d.setLayout(vbox)
 
         # run the dialog
         if not d.exec_(): return
 
-        fee = unicode(fee_e.text())
-        try:
-            fee = self.read_amount(fee)
-        except Exception:
+        fee = fee_e.get_amount()
+        if fee is None:
             QMessageBox.warning(self, _('Error'), _('Invalid value') +': %s'%fee, _('OK'))
             return
 
@@ -2116,16 +2577,26 @@ class ElectrumWindow(QMainWindow):
             self.num_zeros = nz
             self.config.set_key('num_zeros', nz, True)
             self.update_history_tab()
-            self.update_receive_tab()
+            self.update_address_tab()
 
         usechange_result = usechange_cb.isChecked()
         if self.wallet.use_change != usechange_result:
             self.wallet.use_change = usechange_result
             self.wallet.storage.put('use_change', self.wallet.use_change)
 
+        if showtx_cb.isChecked() != show_tx:
+            self.config.set_key('show_before_broadcast', not show_tx)
+
         unit_result = units[unit_combo.currentIndex()]
         if self.base_unit() != unit_result:
-            self.decimal_point = 8 if unit_result == 'BTC' else 5
+            if unit_result == 'BTC':
+                self.decimal_point = 8
+            elif unit_result == 'mBTC':
+                self.decimal_point = 5
+            elif unit_result == 'bits':
+                self.decimal_point = 2
+            else:
+                raise Exception('Unknown base unit')
             self.config.set_key('decimal_point', self.decimal_point, True)
             self.update_history_tab()
             self.update_status()
@@ -2137,6 +2608,9 @@ class ElectrumWindow(QMainWindow):
             self.config.set_key("language", lang_request, True)
             need_restart = True
 
+        be_result = block_explorers[block_ex_combo.currentIndex()]
+        self.config.set_key('block_explorer', be_result, True)
+
         run_hook('close_settings_dialog')
 
         if need_restart:
@@ -2150,8 +2624,10 @@ class ElectrumWindow(QMainWindow):
 
     def closeEvent(self, event):
         self.tray.hide()
-        g = self.geometry()
-        self.config.set_key("winpos-qt", [g.left(),g.top(),g.width(),g.height()], True)
+        self.config.set_key("is_maximized", self.isMaximized())
+        if not self.isMaximized():
+            g = self.geometry()
+            self.config.set_key("winpos-qt", [g.left(),g.top(),g.width(),g.height()])
         self.save_column_widths()
         self.config.set_key("console-history", self.console.history[-50:], True)
         self.wallet.storage.put('accounts_expanded', self.accounts_expanded)
@@ -2215,30 +2691,30 @@ class ElectrumWindow(QMainWindow):
 
 
     def show_account_details(self, k):
+        account = self.wallet.accounts[k]
+
         d = QDialog(self)
         d.setWindowTitle(_('Account Details'))
         d.setModal(1)
 
         vbox = QVBoxLayout(d)
-        roots = self.wallet.get_roots(k)
-
         name = self.wallet.get_account_name(k)
         label = QLabel('Name: ' + name)
         vbox.addWidget(label)
 
-        acctype = '2 of 2' if len(roots) == 2 else '2 of 3' if len(roots) == 3 else 'Single key'
-        vbox.addWidget(QLabel('Type: ' + acctype))
+        vbox.addWidget(QLabel(_('Address type') + ': ' + account.get_type()))
 
-        label = QLabel('Derivation: ' + k)
-        vbox.addWidget(label)
+        vbox.addWidget(QLabel(_('Derivation') + ': ' + k))
+
+        vbox.addWidget(QLabel(_('Master Public Key:')))
+
+        text = QTextEdit()
+        text.setReadOnly(True)
+        text.setMaximumHeight(170)
+        vbox.addWidget(text)
 
-        #for root in roots:
-        #    mpk = self.wallet.master_public_keys[root]
-        #    text = QTextEdit()
-        #    text.setReadOnly(True)
-        #    text.setMaximumHeight(120)
-        #    text.setText(repr(mpk))
-        #    vbox.addWidget(text)
+        mpk_text = '\n'.join( account.get_master_pubkeys() )
+        text.setText(mpk_text)
 
         vbox.addLayout(close_button(d))
         d.exec_()