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         self.button.setHidden(b)
  62
  63     def setGreen(self):
  64         self.is_pr = True
  65         self.setStyleSheet("QWidget { background-color:#80ff80;}")
  66
  67     def setExpired(self):
  68         self.is_pr = True
  69         self.setStyleSheet("QWidget { background-color:#ffcccc;}")
  70
  71     def parse_address_and_amount(self, line):
  72         m = re.match('^OP_RETURN\s+"(.+)"$', line.strip())
  73         if m:
  74             address = 'OP_RETURN:' + m.group(1)
  75             amount = 0
  76         else:
  77             x, y = line.split(',')
  78             address = self.parse_address(x)
  79             amount = self.parse_amount(y)
  80         return address, amount
  81
  82
  83     def parse_amount(self, x):
  84         p = pow(10, self.amount_edit.decimal_point())
  85         return int( p * Decimal(x.strip()))
  86
  87
  88     def parse_address(self, line):
  89         r = line.strip()
  90         m = re.match('^'+RE_ALIAS+'$', r)
  91         address = m.group(2) if m else r
  92         assert bitcoin.is_address(address)
  93         return address
  94
  95
  96     def check_text(self):
  97         if self.is_pr:
  98             return
  99
 100         # filter out empty lines
 101         lines = filter( lambda x: x, self.lines())
 102         outputs = []
 103         total = 0
 104
 105         self.payto_address = None
 106
 107         if len(lines) == 1:
 108             try:
 109                 self.payto_address = self.parse_address(lines[0])
 110             except:
 111                 pass
 112
 113             if self.payto_address:
 114                 self.unlock_amount()
 115                 return
 116
 117         for line in lines:
 118             try:
 119                 to_address, amount = self.parse_address_and_amount(line)
 120             except:
 121                 continue
 122
 123             outputs.append((to_address, amount))
 124             total += amount
 125
 126         self.outputs = outputs
 127         self.payto_address = None
 128
 129         if outputs:
 130             self.amount_edit.setAmount(total)
 131         else:
 132             self.amount_edit.setText("")
 133
 134         self.amount_edit.textEdited.emit("")
 135
 136         if total or len(lines)>1:
 137             self.lock_amount()
 138         else:
 139             self.unlock_amount()
 140
 141
 142     def get_outputs(self):
 143         if self.payto_address:
 144             try:
 145                 amount = self.amount_edit.get_amount()
 146             except:
 147                 amount = None
 148
 149             self.outputs = [(self.payto_address, amount)]
 150
 151         return self.outputs[:]
 152
 153
 154     def lines(self):
 155         return str(self.toPlainText()).split('\n')
 156
 157
 158     def is_multiline(self):
 159         return len(self.lines()) > 1
 160
 161
 162     def update_size(self):
 163         docHeight = self.document().size().height()
 164         if self.heightMin <= docHeight <= self.heightMax:
 165             self.setMinimumHeight(docHeight + 2)
 166             self.setMaximumHeight(docHeight + 2)
 167
 168
 169     def setCompleter(self, completer):
 170         self.c = completer
 171         self.c.setWidget(self)
 172         self.c.setCompletionMode(QCompleter.PopupCompletion)
 173         self.c.activated.connect(self.insertCompletion)
 174
 175
 176     def insertCompletion(self, completion):
 177         if self.c.widget() != self:
 178             return
 179         tc = self.textCursor()
 180         extra = completion.length() - self.c.completionPrefix().length()
 181         tc.movePosition(QTextCursor.Left)
 182         tc.movePosition(QTextCursor.EndOfWord)
 183         tc.insertText(completion.right(extra))
 184         self.setTextCursor(tc)
 185
 186
 187     def textUnderCursor(self):
 188         tc = self.textCursor()
 189         tc.select(QTextCursor.WordUnderCursor)
 190         return tc.selectedText()
 191
 192
 193     def keyPressEvent(self, e):
 194         if self.isReadOnly():
 195             return
 196
 197         if self.c.popup().isVisible():
 198             if e.key() in [Qt.Key_Enter, Qt.Key_Return]:
 199                 e.ignore()
 200                 return
 201
 202         if e.key() in [Qt.Key_Tab]:
 203             e.ignore()
 204             return
 205
 206         if e.key() in [Qt.Key_Down, Qt.Key_Up] and not self.is_multiline():
 207             e.ignore()
 208             return
 209
 210         QTextEdit.keyPressEvent(self, e)
 211
 212         ctrlOrShift = e.modifiers() and (Qt.ControlModifier or Qt.ShiftModifier)
 213         if self.c is None or (ctrlOrShift and e.text().isEmpty()):
 214             return
 215
 216         eow = QString("~!@#$%^&*()_+{}|:\"<>?,./;'[]\\-=")
 217         hasModifier = (e.modifiers() != Qt.NoModifier) and not ctrlOrShift;
 218         completionPrefix = self.textUnderCursor()
 219
 220         if hasModifier or e.text().isEmpty() or completionPrefix.length() < 1 or eow.contains(e.text().right(1)):
 221             self.c.popup().hide()
 222             return
 223
 224         if completionPrefix != self.c.completionPrefix():
 225             self.c.setCompletionPrefix(completionPrefix);
 226             self.c.popup().setCurrentIndex(self.c.completionModel().index(0, 0))
 227
 228         cr = self.cursorRect()
 229         cr.setWidth(self.c.popup().sizeHintForColumn(0) + self.c.popup().verticalScrollBar().sizeHint().width())
 230         self.c.complete(cr)
 231