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