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