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         self.scan_f = self.win.pay_from_URI
  49         self.update_size()
  50         self.payto_address = None
  51
  52     def lock_amount(self):
  53         self.amount_edit.setFrozen(True)
  54
  55     def unlock_amount(self):
  56         self.amount_edit.setFrozen(False)
  57
  58     def setFrozen(self, b):
  59         self.setReadOnly(b)
  60         self.setStyleSheet(frozen_style if b else normal_style)
  61
  62     def setGreen(self):
  63         self.is_pr = True
  64         self.setStyleSheet("QWidget { background-color:#80ff80;}")
  65
  66     def setExpired(self):
  67         self.is_pr = True
  68         self.setStyleSheet("QWidget { background-color:#ffcccc;}")
  69
  70     def parse_address_and_amount(self, line):
  71         x, y = line.split(',')
  72         address = self.parse_address(x)
  73         amount = self.parse_amount(y)
  74         return address, amount
  75
  76
  77     def parse_amount(self, x):
  78         p = pow(10, self.amount_edit.decimal_point())
  79         return int( p * Decimal(x.strip()))
  80
  81
  82     def parse_address(self, line):
  83         r = line.strip()
  84         m = re.match('^'+RE_ALIAS+'$', r)
  85         address = m.group(2) if m else r
  86         assert bitcoin.is_address(address)
  87         return address
  88
  89
  90     def check_text(self):
  91         if self.is_pr:
  92             return
  93
  94         # filter out empty lines
  95         lines = filter( lambda x: x, self.lines())
  96         outputs = []
  97         total = 0
  98
  99         self.payto_address = None
 100
 101         if len(lines) == 1:
 102             try:
 103                 self.payto_address = self.parse_address(lines[0])
 104             except:
 105                 pass
 106
 107             if self.payto_address:
 108                 self.unlock_amount()
 109                 return
 110
 111         for line in lines:
 112             try:
 113                 to_address, amount = self.parse_address_and_amount(line)
 114             except:
 115                 continue
 116
 117             outputs.append((to_address, amount))
 118             total += amount
 119
 120         self.outputs = outputs
 121         self.payto_address = None
 122
 123         if total:
 124             self.amount_edit.setAmount(total)
 125         else:
 126             self.amount_edit.setText("")
 127
 128         self.amount_edit.textEdited.emit("")
 129
 130         if total or len(lines)>1:
 131             self.lock_amount()
 132         else:
 133             self.unlock_amount()
 134
 135
 136     def get_outputs(self):
 137         if self.payto_address:
 138             try:
 139                 amount = self.amount_edit.get_amount()
 140             except:
 141                 amount = None
 142
 143             self.outputs = [(self.payto_address, amount)]
 144
 145         return self.outputs[:]
 146
 147
 148     def lines(self):
 149         return str(self.toPlainText()).split('\n')
 150
 151
 152     def is_multiline(self):
 153         return len(self.lines()) > 1
 154
 155
 156     def update_size(self):
 157         docHeight = self.document().size().height()
 158         if self.heightMin <= docHeight <= self.heightMax:
 159             self.setMinimumHeight(docHeight + 2)
 160             self.setMaximumHeight(docHeight + 2)
 161
 162
 163     def setCompleter(self, completer):
 164         self.c = completer
 165         self.c.setWidget(self)
 166         self.c.setCompletionMode(QCompleter.PopupCompletion)
 167         self.c.activated.connect(self.insertCompletion)
 168
 169
 170     def insertCompletion(self, completion):
 171         if self.c.widget() != self:
 172             return
 173         tc = self.textCursor()
 174         extra = completion.length() - self.c.completionPrefix().length()
 175         tc.movePosition(QTextCursor.Left)
 176         tc.movePosition(QTextCursor.EndOfWord)
 177         tc.insertText(completion.right(extra))
 178         self.setTextCursor(tc)
 179
 180
 181     def textUnderCursor(self):
 182         tc = self.textCursor()
 183         tc.select(QTextCursor.WordUnderCursor)
 184         return tc.selectedText()
 185
 186
 187     def keyPressEvent(self, e):
 188         if self.isReadOnly():
 189             return
 190
 191         if self.c.popup().isVisible():
 192             if e.key() in [Qt.Key_Enter, Qt.Key_Return]:
 193                 e.ignore()
 194                 return
 195
 196         if e.key() in [Qt.Key_Tab]:
 197             e.ignore()
 198             return
 199
 200         if e.key() in [Qt.Key_Down, Qt.Key_Up] and not self.is_multiline():
 201             e.ignore()
 202             return
 203
 204         isShortcut = (e.modifiers() and Qt.ControlModifier) and e.key() == Qt.Key_E
 205
 206         if not self.c or not isShortcut:
 207             QTextEdit.keyPressEvent(self, e)
 208
 209
 210         ctrlOrShift = e.modifiers() and (Qt.ControlModifier or Qt.ShiftModifier)
 211         if self.c is None or (ctrlOrShift and e.text().isEmpty()):
 212             return
 213
 214         eow = QString("~!@#$%^&*()_+{}|:\"<>?,./;'[]\\-=")
 215         hasModifier = (e.modifiers() != Qt.NoModifier) and not ctrlOrShift;
 216         completionPrefix = self.textUnderCursor()
 217
 218         if not isShortcut and (hasModifier or e.text().isEmpty() or completionPrefix.length() < 1 or eow.contains(e.text().right(1)) ):
 219             self.c.popup().hide()
 220             return
 221
 222         if completionPrefix != self.c.completionPrefix():
 223             self.c.setCompletionPrefix(completionPrefix);
 224             self.c.popup().setCurrentIndex(self.c.completionModel().index(0, 0))
 225
 226         cr = self.cursorRect()
 227         cr.setWidth(self.c.popup().sizeHintForColumn(0) + self.c.popup().verticalScrollBar().sizeHint().width())
 228         self.c.complete(cr)
 229
 230