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
  50     def lock_amount(self):
  51         self.amount_edit.setFrozen(True)
  52
  53     def unlock_amount(self):
  54         self.amount_edit.setFrozen(False)
  55
  56     def setFrozen(self, b):
  57         self.setReadOnly(b)
  58         self.setStyleSheet(frozen_style if b else normal_style)
  59
  60     def setGreen(self):
  61         self.is_pr = True
  62         self.setStyleSheet("QWidget { background-color:#80ff80;}")
  63
  64     def setExpired(self):
  65         self.is_pr = True
  66         self.setStyleSheet("QWidget { background-color:#ffcccc;}")
  67
  68     def parse_address_and_amount(self, line):
  69         x, y = line.split(',')
  70         address = self.parse_address(x)
  71         amount = self.parse_amount(y)
  72         return address, amount
  73
  74
  75     def parse_amount(self, x):
  76         p = pow(10, self.amount_edit.decimal_point())
  77         return int( p * Decimal(x.strip()))
  78
  79
  80     def parse_address(self, line):
  81         r = line.strip()
  82         m = re.match('^'+RE_ALIAS+'$', r)
  83         address = m.group(2) if m else r
  84         assert bitcoin.is_address(address)
  85         return address
  86
  87
  88     def check_text(self):
  89         if self.is_pr:
  90             return
  91
  92         # filter out empty lines
  93         lines = filter( lambda x: x, self.lines())
  94         outputs = []
  95         total = 0
  96
  97         self.payto_address = None
  98
  99         if len(lines) == 1:
 100             try:
 101                 self.payto_address = self.parse_address(lines[0])
 102             except:
 103                 pass
 104
 105             if self.payto_address:
 106                 self.unlock_amount()
 107                 return
 108
 109         for line in lines:
 110             try:
 111                 to_address, amount = self.parse_address_and_amount(line)
 112             except:
 113                 continue
 114
 115             outputs.append((to_address, amount))
 116             total += amount
 117
 118         self.outputs = outputs
 119         self.payto_address = None
 120
 121         if total:
 122             self.amount_edit.setAmount(total)
 123         else:
 124             self.amount_edit.setText("")
 125
 126         if total or len(lines)>1:
 127             self.lock_amount()
 128         else:
 129             self.unlock_amount()
 130
 131
 132     def get_outputs(self):
 133         if self.payto_address:
 134             try:
 135                 amount = self.amount_edit.get_amount()
 136             except:
 137                 amount = None
 138
 139             self.outputs = [(self.payto_address, amount)]
 140
 141         return self.outputs[:]
 142
 143
 144     def lines(self):
 145         return str(self.toPlainText()).split('\n')
 146
 147
 148     def is_multiline(self):
 149         return len(self.lines()) > 1
 150
 151
 152     def update_size(self):
 153         docHeight = self.document().size().height()
 154         if self.heightMin <= docHeight <= self.heightMax:
 155             self.setMinimumHeight(docHeight + 2)
 156             self.setMaximumHeight(docHeight + 2)
 157
 158
 159     def setCompleter(self, completer):
 160         self.c = completer
 161         self.c.setWidget(self)
 162         self.c.setCompletionMode(QCompleter.PopupCompletion)
 163         self.c.activated.connect(self.insertCompletion)
 164
 165
 166     def insertCompletion(self, completion):
 167         if self.c.widget() != self:
 168             return
 169         tc = self.textCursor()
 170         extra = completion.length() - self.c.completionPrefix().length()
 171         tc.movePosition(QTextCursor.Left)
 172         tc.movePosition(QTextCursor.EndOfWord)
 173         tc.insertText(completion.right(extra))
 174         self.setTextCursor(tc)
 175
 176
 177     def textUnderCursor(self):
 178         tc = self.textCursor()
 179         tc.select(QTextCursor.WordUnderCursor)
 180         return tc.selectedText()
 181
 182
 183     def keyPressEvent(self, e):
 184         if self.isReadOnly():
 185             return
 186
 187         if self.c.popup().isVisible():
 188             if e.key() in [Qt.Key_Enter, Qt.Key_Return]:
 189                 e.ignore()
 190                 return
 191
 192         if e.key() in [Qt.Key_Tab]:
 193             e.ignore()
 194             return
 195
 196         if e.key() in [Qt.Key_Down, Qt.Key_Up] and not self.is_multiline():
 197             e.ignore()
 198             return
 199
 200         isShortcut = (e.modifiers() and Qt.ControlModifier) and e.key() == Qt.Key_E
 201
 202         if not self.c or not isShortcut:
 203             QTextEdit.keyPressEvent(self, e)
 204
 205
 206         ctrlOrShift = e.modifiers() and (Qt.ControlModifier or Qt.ShiftModifier)
 207         if self.c is None or (ctrlOrShift and e.text().isEmpty()):
 208             return
 209
 210         eow = QString("~!@#$%^&*()_+{}|:\"<>?,./;'[]\\-=")
 211         hasModifier = (e.modifiers() != Qt.NoModifier) and not ctrlOrShift;
 212         completionPrefix = self.textUnderCursor()
 213
 214         if not isShortcut and (hasModifier or e.text().isEmpty() or completionPrefix.length() < 1 or eow.contains(e.text().right(1)) ):
 215             self.c.popup().hide()
 216             return
 217
 218         if completionPrefix != self.c.completionPrefix():
 219             self.c.setCompletionPrefix(completionPrefix);
 220             self.c.popup().setCurrentIndex(self.c.completionModel().index(0, 0))
 221
 222         cr = self.cursorRect()
 223         cr.setWidth(self.c.popup().sizeHintForColumn(0) + self.c.popup().verticalScrollBar().sizeHint().width())
 224         self.c.complete(cr)
 225
 226