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         self.is_pr = False
  46
  47     def lock_amount(self):
  48         self.amount_edit.setFrozen(True)
  49
  50     def unlock_amount(self):
  51         self.amount_edit.setFrozen(False)
  52
  53     def setFrozen(self, b):
  54         self.setReadOnly(b)
  55         self.setStyleSheet(frozen_style if b else normal_style)
  56
  57     def setGreen(self):
  58         self.is_pr = True
  59         self.setStyleSheet("QWidget { background-color:#80ff80;}")
  60
  61     def setExpired(self):
  62         self.is_pr = True
  63         self.setStyleSheet("QWidget { background-color:#ffcccc;}")
  64
  65     def parse_address_and_amount(self, line):
  66         x, y = line.split(',')
  67         address = self.parse_address(x)
  68         amount = self.parse_amount(y)
  69         return address, amount
  70
  71
  72     def parse_amount(self, x):
  73         p = pow(10, self.amount_edit.decimal_point())
  74         return int( p * Decimal(x.strip()))
  75
  76
  77     def parse_address(self, line):
  78         r = line.strip()
  79         m = re.match('^'+RE_ALIAS+'$', r)
  80         address = m.group(2) if m else r
  81         assert bitcoin.is_address(address)
  82         return address
  83
  84
  85     def check_text(self):
  86         if self.is_pr:
  87             return
  88
  89         # filter out empty lines
  90         lines = filter( lambda x: x, self.lines())
  91         outputs = []
  92         total = 0
  93
  94         self.payto_address = None
  95
  96         if len(lines) == 1:
  97             try:
  98                 self.payto_address = self.parse_address(lines[0])
  99             except:
 100                 pass
 101
 102             if self.payto_address:
 103                 self.unlock_amount()
 104                 return
 105
 106         for line in lines:
 107             try:
 108                 to_address, amount = self.parse_address_and_amount(line)
 109             except:
 110                 continue
 111
 112             outputs.append((to_address, amount))
 113             total += amount
 114
 115         self.outputs = outputs
 116         self.payto_address = None
 117
 118         if total:
 119             self.amount_edit.setAmount(total)
 120         else:
 121             self.amount_edit.setText("")
 122
 123         if total or len(lines)>1:
 124             self.lock_amount()
 125         else:
 126             self.unlock_amount()
 127
 128
 129     def get_outputs(self):
 130         if self.payto_address:
 131             try:
 132                 amount = self.amount_edit.get_amount()
 133             except:
 134                 amount = None
 135
 136             self.outputs = [(self.payto_address, amount)]
 137
 138         return self.outputs[:]
 139
 140
 141     def lines(self):
 142         return str(self.toPlainText()).split('\n')
 143
 144
 145     def is_multiline(self):
 146         return len(self.lines()) > 1
 147
 148
 149     def update_size(self):
 150         docHeight = self.document().size().height()
 151         if self.heightMin <= docHeight <= self.heightMax:
 152             self.setMinimumHeight(docHeight + 2)
 153             self.setMaximumHeight(docHeight + 2)
 154
 155
 156     def setCompleter(self, completer):
 157         self.c = completer
 158         self.c.setWidget(self)
 159         self.c.setCompletionMode(QCompleter.PopupCompletion)
 160         self.c.activated.connect(self.insertCompletion)
 161
 162
 163     def insertCompletion(self, completion):
 164         if self.c.widget() != self:
 165             return
 166         tc = self.textCursor()
 167         extra = completion.length() - self.c.completionPrefix().length()
 168         tc.movePosition(QTextCursor.Left)
 169         tc.movePosition(QTextCursor.EndOfWord)
 170         tc.insertText(completion.right(extra))
 171         self.setTextCursor(tc)
 172
 173
 174     def textUnderCursor(self):
 175         tc = self.textCursor()
 176         tc.select(QTextCursor.WordUnderCursor)
 177         return tc.selectedText()
 178
 179
 180     def keyPressEvent(self, e):
 181         if self.isReadOnly():
 182             return
 183
 184         if self.c.popup().isVisible():
 185             if e.key() in [Qt.Key_Enter, Qt.Key_Return]:
 186                 e.ignore()
 187                 return
 188
 189         if e.key() in [Qt.Key_Tab]:
 190             e.ignore()
 191             return
 192
 193         if e.key() in [Qt.Key_Down, Qt.Key_Up] and not self.is_multiline():
 194             e.ignore()
 195             return
 196
 197         isShortcut = (e.modifiers() and Qt.ControlModifier) and e.key() == Qt.Key_E
 198
 199         if not self.c or not isShortcut:
 200             QTextEdit.keyPressEvent(self, e)
 201
 202
 203         ctrlOrShift = e.modifiers() and (Qt.ControlModifier or Qt.ShiftModifier)
 204         if self.c is None or (ctrlOrShift and e.text().isEmpty()):
 205             return
 206
 207         eow = QString("~!@#$%^&*()_+{}|:\"<>?,./;'[]\\-=")
 208         hasModifier = (e.modifiers() != Qt.NoModifier) and not ctrlOrShift;
 209         completionPrefix = self.textUnderCursor()
 210
 211         if not isShortcut and (hasModifier or e.text().isEmpty() or completionPrefix.length() < 1 or eow.contains(e.text().right(1)) ):
 212             self.c.popup().hide()
 213             return
 214
 215         if completionPrefix != self.c.completionPrefix():
 216             self.c.setCompletionPrefix(completionPrefix);
 217             self.c.popup().setCurrentIndex(self.c.completionModel().index(0, 0))
 218
 219         cr = self.cursorRect()
 220         cr.setWidth(self.c.popup().sizeHintForColumn(0) + self.c.popup().verticalScrollBar().sizeHint().width())
 221         self.c.complete(cr)
 222
 223