From c626cad0dd617912a97d97b0be9f6fa7423e3992 Mon Sep 17 00:00:00 2001
From: ThomasV <thomasv@gitorious>
Date: Tue, 3 Jun 2014 21:53:25 +0200
Subject: [PATCH] paytoedit

---
 gui/qt/main_window.py |  3 +-
 gui/qt/paytoedit.py   | 98 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 100 insertions(+), 1 deletion(-)
 create mode 100644 gui/qt/paytoedit.py

diff --git a/gui/qt/main_window.py b/gui/qt/main_window.py
index e9cd8f419..a4d480b5e 100644
--- a/gui/qt/main_window.py
+++ b/gui/qt/main_window.py
@@ -643,7 +643,8 @@ class ElectrumWindow(QMainWindow):
         grid.setColumnStretch(5,1)
         grid.setRowStretch(8, 1)
 
-        self.payto_e = QLineEdit()
+        from paytoedit import PayToEdit
+        self.payto_e = PayToEdit()
         self.payto_help = HelpButton(_('Recipient of the funds.') + '\n\n' + _('You may enter a Bitcoin address, a label from your list of contacts (a list of completions will be proposed), or an alias (email-like address that forwards to a Bitcoin address)'))
         grid.addWidget(QLabel(_('Pay to')), 1, 0)
         grid.addWidget(self.payto_e, 1, 1, 1, 3)
diff --git a/gui/qt/paytoedit.py b/gui/qt/paytoedit.py
new file mode 100644
index 000000000..3357a2c2b
--- /dev/null
+++ b/gui/qt/paytoedit.py
@@ -0,0 +1,98 @@
+#!/usr/bin/env python
+#
+# Electrum - lightweight Bitcoin client
+# Copyright (C) 2012 thomasv@gitorious
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+from PyQt4.QtCore import *
+from PyQt4.QtGui import *
+
+
+class PayToEdit(QTextEdit):
+
+    def __init__(self, *args, **kwargs):
+        QTextEdit.__init__(self, *args, **kwargs)
+        self.document().contentsChanged.connect(self.update_size)
+        self.heightMin = 0
+        self.heightMax = 150
+        self.setMinimumHeight(27)
+        self.setMaximumHeight(27)
+        #self.setStyleSheet("QTextEdit { border-style:solid; border-width: 1px;}")
+        self.c = None
+
+
+    def update_size(self):
+        docHeight = self.document().size().height()
+        if self.heightMin <= docHeight <= self.heightMax:
+            self.setMinimumHeight(docHeight + 2)
+            self.setMaximumHeight(docHeight + 2)
+
+
+    def setCompleter(self, completer):
+        self.c = completer
+        self.c.setWidget(self)
+        self.c.setCompletionMode(QCompleter.PopupCompletion)
+        self.c.activated.connect(self.insertCompletion)
+
+
+    def insertCompletion(self, completion):
+        if self.c.widget() != self:
+            return
+        tc = self.textCursor()
+        extra = completion.length() - self.c.completionPrefix().length()
+        tc.movePosition(QTextCursor.Left)
+        tc.movePosition(QTextCursor.EndOfWord)
+        tc.insertText(completion.right(extra))
+        self.setTextCursor(tc)
+ 
+
+    def textUnderCursor(self):
+        tc = self.textCursor()
+        tc.select(QTextCursor.WordUnderCursor)
+        return tc.selectedText()
+
+
+    def keyPressEvent(self, e):
+        if self.c.popup().isVisible():
+            if e.key() in [Qt.Key_Enter, Qt.Key_Return]:
+                e.ignore()
+                return
+
+        isShortcut = (e.modifiers() and Qt.ControlModifier) and e.key() == Qt.Key_E
+
+        if not self.c or not isShortcut:
+            QTextEdit.keyPressEvent(self, e)
+
+        ctrlOrShift = e.modifiers() and (Qt.ControlModifier or Qt.ShiftModifier)
+        if self.c is None or (ctrlOrShift and e.text().isEmpty()):
+            return
+
+        eow = QString("~!@#$%^&*()_+{}|:\"<>?,./;'[]\\-=")
+        hasModifier = (e.modifiers() != Qt.NoModifier) and not ctrlOrShift;
+        completionPrefix = self.textUnderCursor()
+
+        if not isShortcut and (hasModifier or e.text().isEmpty() or completionPrefix.length() < 1 or eow.contains(e.text().right(1)) ):
+            self.c.popup().hide()
+            return
+
+        if completionPrefix != self.c.completionPrefix():
+            self.c.setCompletionPrefix(completionPrefix);
+            self.c.popup().setCurrentIndex(self.c.completionModel().index(0, 0))
+
+        cr = self.cursorRect()
+        cr.setWidth(self.c.popup().sizeHintForColumn(0) + self.c.popup().verticalScrollBar().sizeHint().width())
+        self.c.complete(cr)
+
+