#!/usr/bin/env python ############################################################################# ## ## Copyright (C) 2010 Hans-Peter Jansen <hpj@urpla.net>. ## Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). ## All rights reserved. ## ## This file is part of the examples of PyQt. ## ## $QT_BEGIN_LICENSE:BSD$ ## You may use this file under the terms of the BSD license as follows: ## ## "Redistribution and use in source and binary forms, with or without ## modification, are permitted provided that the following conditions are ## met: ## * Redistributions of source code must retain the above copyright ## notice, this list of conditions and the following disclaimer. ## * Redistributions in binary form must reproduce the above copyright ## notice, this list of conditions and the following disclaimer in ## the documentation and/or other materials provided with the ## distribution. ## * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor ## the names of its contributors may be used to endorse or promote ## products derived from this software without specific prior written ## permission. ## ## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT ## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR ## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT ## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, ## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT ## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, ## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY ## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE ## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." ## $QT_END_LICENSE$ ## ############################################################################# # This is only needed for Python v2 but is harmless for Python v3. import sip sip.setapi('QString', 2) from PyQt4 import QtCore, QtGui, QtSvg import delayedencoding_rc class MimeData(QtCore.QMimeData): dataRequested = QtCore.pyqtSignal(str) def formats(self): formats = QtCore.QMimeData.formats(self) formats.append('image/png') return formats def retrieveData(self, mimeType, qvtype): self.dataRequested.emit(mimeType) return QtCore.QMimeData.retrieveData(self, mimeType, qvtype) class SourceWidget(QtGui.QWidget): def __init__(self, parent=None): super(SourceWidget, self).__init__(parent) self.mimeData = None imageFile = QtCore.QFile(':/images/example.svg') imageFile.open(QtCore.QIODevice.ReadOnly) self.imageData = imageFile.readAll() imageFile.close() imageArea = QtGui.QScrollArea() self.imageLabel = QtSvg.QSvgWidget() self.imageLabel.renderer().load(self.imageData) imageArea.setWidget(self.imageLabel) instructTopLabel = QtGui.QLabel("This is an SVG drawing:") instructBottomLabel = QtGui.QLabel("Drag the icon to copy the drawing as a PNG file:") dragIcon = QtGui.QPushButton("Export") dragIcon.setIcon(QtGui.QIcon(':/images/drag.png')) dragIcon.pressed.connect(self.startDrag) layout = QtGui.QGridLayout() layout.addWidget(instructTopLabel, 0, 0, 1, 2) layout.addWidget(imageArea, 1, 0, 2, 2) layout.addWidget(instructBottomLabel, 3, 0) layout.addWidget(dragIcon, 3, 1) self.setLayout(layout) self.setWindowTitle("Delayed Encoding") def createData(self, mimeType): if mimeType != 'image/png': return image = QtGui.QImage(self.imageLabel.size(), QtGui.QImage.Format_RGB32) painter = QtGui.QPainter() painter.begin(image) self.imageLabel.renderer().render(painter) painter.end() data = QtCore.QByteArray() buffer = QtCore.QBuffer(data) buffer.open(QtCore.QIODevice.WriteOnly) image.save(buffer, 'PNG') buffer.close() self.mimeData.setData('image/png', data) def startDrag(self): self.mimeData = MimeData() self.mimeData.dataRequested.connect(self.createData, QtCore.Qt.DirectConnection) drag = QtGui.QDrag(self) drag.setMimeData(self.mimeData) drag.setPixmap(QtGui.QPixmap(':/images/drag.png')) drag.exec_(QtCore.Qt.CopyAction) if __name__ == '__main__': import sys app = QtGui.QApplication(sys.argv) window = SourceWidget() window.show() sys.exit(app.exec_())