gui/qt/paytoedit.py

   1 #!/usr/bin/env python
   2 #
   3 # Electrum - lightweight Bitcoin client
   4 # Copyright (C) 2012 thomasv@gitorious
   5 #
   6 # This program is free software: you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation, either version 3 of the License, or
   9 # (at your option) any later version.
  10 #
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14 # GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program. If not, see <http://www.gnu.org/licenses/>.
  18
  19 from PyQt4.QtCore import *
  20 from PyQt4.QtGui import *
  21 from qrtextedit import QRTextEdit
  22
  23 import re
  24 from decimal import Decimal
  25 from electrum import bitcoin
  26
  27 RE_ADDRESS = '[1-9A-HJ-NP-Za-km-z]{26,}'
  28 RE_ALIAS = '(.*?)\s*\<([1-9A-HJ-NP-Za-km-z]{26,})\>'
  29
  30 frozen_style = "QWidget { background-color:none; border:none;}"
  31 normal_style = "QTextEdit { }"
  32
  33 class PayToEdit(QRTextEdit):
  34
  35     def __init__(self, win):
  36         QRTextEdit.__init__(self)
  37         self.win = win
  38         self.amount_edit = win.amount_e
  39         self.document().contentsChanged.connect(self.update_size)
  40         self.heightMin = 0
  41         self.heightMax = 150
  42         self.setMinimumHeight(27)
  43         self.setMaximumHeight(27)
  44         self.c = None
  45         self.textChanged.connect(self.check_text)
  46         self.outputs = []
  47         self.is_pr = False
  48
  49     def qr_input(self):
  50         from electrum.plugins import run_hook
  51         run_hook('scan_qr_hook', lambda x: self.win.pay_from_URI(x))
  52
  53     def lock_amount(self):
  54         self.amount_edit.setFrozen(True)
  55
  56     def unlock_amount(self):
  57         self.amount_edit.setFrozen(False)
  58
  59     def setFrozen(self, b):
  60         self.setReadOnly(b)
  61         self.setStyleSheet(frozen_style if b else normal_style)
  62
  63     def setGreen(self):
  64         self.is_pr = True
  65         self.setStyleSheet("QWidget { background-color:#80ff80;}")
  66
  67     def setExpired(self):
  68         self.is_pr = True
  69         self.setStyleSheet("QWidget { background-color:#ffcccc;}")
  70
  71     def parse_address_and_amount(self, line):
  72         x, y = line.split(',')
  73         address = self.parse_address(x)
  74         amount = self.parse_amount(y)
  75         return address, amount
  76
  77
  78     def parse_amount(self, x):
  79         p = pow(10, self.amount_edit.decimal_point())
  80         return int( p * Decimal(x.strip()))
  81
  82
  83     def parse_address(self, line):
  84         r = line.strip()
  85         m = re.match('^'+RE_ALIAS+'$', r)
  86         address = m.group(2) if m else r
  87         assert bitcoin.is_address(address)
  88         return address
  89
  90
  91     def check_text(self):
  92         if self.is_pr:
  93             return
  94
  95         # filter out empty lines
  96         lines = filter( lambda x: x, self.lines())
  97         outputs = []
  98         total = 0
  99
 100         self.payto_address = None
 101
 102         if len(lines) == 1:
 103             try:
 104                 self.payto_address = self.parse_address(lines[0])
 105             except:
 106                 pass
 107
 108             if self.payto_address:
 109                 self.unlock_amount()
 110                 return
 111
 112         for line in lines:
 113             try:
 114                 to_address, amount = self.parse_address_and_amount(line)
 115             except:
 116                 continue
 117
 118             outputs.append((to_address, amount))
 119             total += amount
 120
 121         self.outputs = outputs
 122         self.payto_address = None
 123
 124         if total:
 125             self.amount_edit.setAmount(total)
 126         else:
 127             self.amount_edit.setText("")
 128
 129         if total or len(lines)>1:
 130             self.lock_amount()
 131         else:
 132             self.unlock_amount()
 133
 134
 135     def get_outputs(self):
 136         if self.payto_address:
 137             try:
 138                 amount = self.amount_edit.get_amount()
 139             except:
 140                 amount = None
 141
 142             self.outputs = [(self.payto_address, amount)]
 143
 144         return self.outputs[:]
 145
 146
 147     def lines(self):
 148         return str(self.toPlainText()).split('\n')
 149
 150
 151     def is_multiline(self):
 152         return len(self.lines()) > 1
 153
 154
 155     def update_size(self):
 156         docHeight = self.document().size().height()
 157         if self.heightMin <= docHeight <= self.heightMax:
 158             self.setMinimumHeight(docHeight + 2)
 159             self.setMaximumHeight(docHeight + 2)
 160
 161
 162     def setCompleter(self, completer):
 163         self.c = completer
 164         self.c.setWidget(self)
 165         self.c.setCompletionMode(QCompleter.PopupCompletion)
 166         self.c.activated.connect(self.insertCompletion)
 167
 168
 169     def insertCompletion(self, completion):
 170         if self.c.widget() != self:
 171             return
 172         tc = self.textCursor()
 173         extra = completion.length() - self.c.completionPrefix().length()
 174         tc.movePosition(QTextCursor.Left)
 175         tc.movePosition(QTextCursor.EndOfWord)
 176         tc.insertText(completion.right(extra))
 177         self.setTextCursor(tc)
 178
 179
 180     def textUnderCursor(self):
 181         tc = self.textCursor()
 182         tc.select(QTextCursor.WordUnderCursor)
 183         return tc.selectedText()
 184
 185
 186     def keyPressEvent(self, e):
 187         if self.isReadOnly():
 188             return
 189
 190         if self.c.popup().isVisible():
 191             if e.key() in [Qt.Key_Enter, Qt.Key_Return]:
 192                 e.ignore()
 193                 return
 194
 195         if e.key() in [Qt.Key_Tab]:
 196             e.ignore()
 197             return
 198
 199         if e.key() in [Qt.Key_Down, Qt.Key_Up] and not self.is_multiline():
 200             e.ignore()
 201             return
 202
 203         isShortcut = (e.modifiers() and Qt.ControlModifier) and e.key() == Qt.Key_E
 204
 205         if not self.c or not isShortcut:
 206             QTextEdit.keyPressEvent(self, e)
 207
 208
 209         ctrlOrShift = e.modifiers() and (Qt.ControlModifier or Qt.ShiftModifier)
 210         if self.c is None or (ctrlOrShift and e.text().isEmpty()):
 211             return
 212
 213         eow = QString("~!@#$%^&*()_+{}|:\"<>?,./;'[]\\-=")
 214         hasModifier = (e.modifiers() != Qt.NoModifier) and not ctrlOrShift;
 215         completionPrefix = self.textUnderCursor()
 216
 217         if not isShortcut and (hasModifier or e.text().isEmpty() or completionPrefix.length() < 1 or eow.contains(e.text().right(1)) ):
 218             self.c.popup().hide()
 219             return
 220
 221         if completionPrefix != self.c.completionPrefix():
 222             self.c.setCompletionPrefix(completionPrefix);
 223             self.c.popup().setCurrentIndex(self.c.completionModel().index(0, 0))
 224
 225         cr = self.cursorRect()
 226         cr.setWidth(self.c.popup().sizeHintForColumn(0) + self.c.popup().verticalScrollBar().sizeHint().width())
 227         self.c.complete(cr)
 228
 229