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
  22 import re
  23 from decimal import Decimal
  24 from electrum import bitcoin
  25
  26 RE_ADDRESS = '[1-9A-HJ-NP-Za-km-z]{26,}'
  27 RE_ALIAS = '(.*?)\s*\<([1-9A-HJ-NP-Za-km-z]{26,})\>'
  28
  29 frozen_style = "QWidget { background-color:none; border:none;}"
  30 normal_style = "QTextEdit { }"
  31
  32 class PayToEdit(QTextEdit):
  33
  34     def __init__(self, amount_edit):
  35         QTextEdit.__init__(self)
  36         self.amount_edit = amount_edit
  37         self.document().contentsChanged.connect(self.update_size)
  38         self.heightMin = 0
  39         self.heightMax = 150
  40         self.setMinimumHeight(27)
  41         self.setMaximumHeight(27)
  42         self.c = None
  43
  44     def lock_amount(self):
  45         self.amount_edit.setFrozen(True)
  46
  47     def unlock_amount(self):
  48         self.amount_edit.setFrozen(False)
  49
  50     def setFrozen(self, b):
  51         self.setReadOnly(b)
  52         self.setStyleSheet(frozen_style if b else normal_style)
  53
  54     def setGreen(self):
  55         self.setStyleSheet("QWidget { background-color:#00ff00;}")
  56
  57     def parse_address_and_amount(self, line):
  58         x, y = line.split(',')
  59         address = self.parse_address(x)
  60         amount = self.parse_amount(y)
  61         return address, amount
  62
  63
  64     def parse_amount(self, x):
  65         p = pow(10, self.amount_edit.decimal_point())
  66         return int( p * Decimal(x.strip()))
  67
  68
  69     def parse_address(self, line):
  70         r = line.strip()
  71         m = re.match('^'+RE_ALIAS+'$', r)
  72         address = m.group(2) if m else r
  73         assert bitcoin.is_address(address)
  74         return address
  75
  76
  77     def check_text(self):
  78         # filter out empty lines
  79         lines = filter( lambda x: x, self.lines())
  80         outputs = []
  81         total = 0
  82
  83         if len(lines) == 1:
  84             try:
  85                 self.payto_address = self.parse_address(lines[0])
  86             except:
  87                 self.payto_address = None
  88
  89             if self.payto_address:
  90                 self.unlock_amount()
  91                 return
  92
  93         for line in lines:
  94             try:
  95                 to_address, amount = self.parse_address_and_amount(line)
  96             except:
  97                 continue
  98
  99             outputs.append((to_address, amount))
 100             total += amount
 101
 102         self.outputs = outputs
 103         self.payto_address = None
 104
 105         if total:
 106             self.amount_edit.setAmount(total)
 107         else:
 108             self.amount_edit.setText("")
 109
 110         if total or len(lines)>1:
 111             self.lock_amount()
 112         else:
 113             self.unlock_amount()
 114
 115
 116
 117     def get_outputs(self):
 118
 119         if self.payto_address:
 120
 121             if not bitcoin.is_address(self.payto_address):
 122                 QMessageBox.warning(self, _('Error'), _('Invalid Bitcoin Address') + ':\n' + to_address, _('OK'))
 123                 return
 124
 125             try:
 126                 amount = self.amount_edit.get_amount()
 127             except Exception:
 128                 QMessageBox.warning(self, _('Error'), _('Invalid Amount'), _('OK'))
 129                 return
 130
 131             outputs = [(self.payto_address, amount)]
 132             return outputs
 133
 134         return self.outputs
 135
 136
 137     def lines(self):
 138         return str(self.toPlainText()).split('\n')
 139
 140
 141     def is_multiline(self):
 142         return len(self.lines()) > 1
 143
 144
 145     def update_size(self):
 146         docHeight = self.document().size().height()
 147         if self.heightMin <= docHeight <= self.heightMax:
 148             self.setMinimumHeight(docHeight + 2)
 149             self.setMaximumHeight(docHeight + 2)
 150
 151
 152     def setCompleter(self, completer):
 153         self.c = completer
 154         self.c.setWidget(self)
 155         self.c.setCompletionMode(QCompleter.PopupCompletion)
 156         self.c.activated.connect(self.insertCompletion)
 157
 158
 159     def insertCompletion(self, completion):
 160         if self.c.widget() != self:
 161             return
 162         tc = self.textCursor()
 163         extra = completion.length() - self.c.completionPrefix().length()
 164         tc.movePosition(QTextCursor.Left)
 165         tc.movePosition(QTextCursor.EndOfWord)
 166         tc.insertText(completion.right(extra))
 167         self.setTextCursor(tc)
 168         self.check_text()
 169
 170
 171     def textUnderCursor(self):
 172         tc = self.textCursor()
 173         tc.select(QTextCursor.WordUnderCursor)
 174         return tc.selectedText()
 175
 176
 177     def keyPressEvent(self, e):
 178         if self.c.popup().isVisible():
 179             if e.key() in [Qt.Key_Enter, Qt.Key_Return]:
 180                 e.ignore()
 181                 return
 182
 183         if e.key() in [Qt.Key_Tab]:
 184             e.ignore()
 185             return
 186
 187         if e.key() in [Qt.Key_Down, Qt.Key_Up] and not self.is_multiline():
 188             e.ignore()
 189             return
 190
 191         isShortcut = (e.modifiers() and Qt.ControlModifier) and e.key() == Qt.Key_E
 192
 193         if not self.c or not isShortcut:
 194             QTextEdit.keyPressEvent(self, e)
 195             self.check_text()
 196
 197
 198         ctrlOrShift = e.modifiers() and (Qt.ControlModifier or Qt.ShiftModifier)
 199         if self.c is None or (ctrlOrShift and e.text().isEmpty()):
 200             return
 201
 202         eow = QString("~!@#$%^&*()_+{}|:\"<>?,./;'[]\\-=")
 203         hasModifier = (e.modifiers() != Qt.NoModifier) and not ctrlOrShift;
 204         completionPrefix = self.textUnderCursor()
 205
 206         if not isShortcut and (hasModifier or e.text().isEmpty() or completionPrefix.length() < 1 or eow.contains(e.text().right(1)) ):
 207             self.c.popup().hide()
 208             return
 209
 210         if completionPrefix != self.c.completionPrefix():
 211             self.c.setCompletionPrefix(completionPrefix);
 212             self.c.popup().setCurrentIndex(self.c.completionModel().index(0, 0))
 213
 214         cr = self.cursorRect()
 215         cr.setWidth(self.c.popup().sizeHintForColumn(0) + self.c.popup().verticalScrollBar().sizeHint().width())
 216         self.c.complete(cr)
 217
 218