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| Original file line number | Diff line number | Diff line change |
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| #!/usr/bin/env python | ||
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| ############################################################################# | ||
| ## | ||
| ## Copyright (C) 2005-2005 Trolltech AS. All rights reserved. | ||
| ## | ||
| ## This file is part of the example classes of the Qt Toolkit. | ||
| ## | ||
| ## This file may be used under the terms of the GNU General Public | ||
| ## License version 2.0 as published by the Free Software Foundation | ||
| ## and appearing in the file LICENSE.GPL included in the packaging of | ||
| ## this file. Please review the following information to ensure GNU | ||
| ## General Public Licensing requirements will be met: | ||
| ## http://www.trolltech.com/products/qt/opensource.html | ||
| ## | ||
| ## If you are unsure which license is appropriate for your use, please | ||
| ## review the following information: | ||
| ## http://www.trolltech.com/products/qt/licensing.html or contact the | ||
| ## sales department at [email protected]. | ||
| ## | ||
| ## This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE | ||
| ## WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. | ||
| ## | ||
| ############################################################################# | ||
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| from PySide import QtCore, QtGui | ||
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| class ImageViewer(QtGui.QGroupBox): | ||
| def __init__(self, file_name="", tab_name="image"): | ||
| super(ImageViewer, self).__init__(tab_name) | ||
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| self.file_name = file_name | ||
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| self.printer = QtGui.QPrinter() | ||
| self.scaleFactor = 0.0 | ||
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| self.imageLabel = QtGui.QLabel() | ||
| self.imageLabel.setBackgroundRole(QtGui.QPalette.Base) | ||
| self.imageLabel.setSizePolicy(QtGui.QSizePolicy.Ignored, | ||
| QtGui.QSizePolicy.Ignored) | ||
| self.imageLabel.setScaledContents(True) | ||
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| self.scrollArea = QtGui.QScrollArea() | ||
| self.scrollArea.setBackgroundRole(QtGui.QPalette.Dark) | ||
| self.scrollArea.setWidget(self.imageLabel) | ||
| self.setCentralWidget(self.scrollArea) | ||
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| self.createActions() | ||
| self.createMenus() | ||
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| self.setWindowTitle("Image Viewer") | ||
| self.resize(500, 400) | ||
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| def open(self): | ||
| file_name, _ = QtGui.QFileDialog.getOpenFileName(self, "Open File", QtCore.QDir.currentPath()) | ||
| print("file %s" % file_name) | ||
| if file_name: | ||
| image = QtGui.QImage(file_name) | ||
| if image.isNull(): | ||
| QtGui.QMessageBox.information(self, "Image Viewer Cannot load %s." % file_name) | ||
| return | ||
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| self.imageLabel.setPixmap(QtGui.QPixmap.fromImage(image)) | ||
| self.scaleFactor = 1.0 | ||
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| self.printAct.setEnabled(True) | ||
| self.fitToWindowAct.setEnabled(True) | ||
| self.updateActions() | ||
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| if not self.fitToWindowAct.isChecked(): | ||
| self.imageLabel.adjustSize() | ||
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| def print_(self): | ||
| dialog = QtGui.QPrintDialog(self.printer, self) | ||
| if dialog.exec_(): | ||
| painter = QtGui.QPainter(self.printer) | ||
| rect = painter.viewport() | ||
| size = self.imageLabel.pixmap().size() | ||
| size.scale(rect.size(), QtCore.Qt.KeepAspectRatio) | ||
| painter.setViewport(rect.x(), rect.y(), size.width(), size.height()) | ||
| painter.setWindow(self.imageLabel.pixmap().rect()) | ||
| painter.drawPixmap(0, 0, self.imageLabel.pixmap()) | ||
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| def zoomIn(self): | ||
| self.scaleImage(1.25) | ||
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| def zoomOut(self): | ||
| self.scaleImage(0.8) | ||
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| def normalSize(self): | ||
| self.imageLabel.adjustSize() | ||
| self.scaleFactor = 1.0 | ||
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| def fitToWindow(self): | ||
| fitToWindow = self.fitToWindowAct.isChecked() | ||
| self.scrollArea.setWidgetResizable(fitToWindow) | ||
| if not fitToWindow: | ||
| self.normalSize() | ||
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| self.updateActions() | ||
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| def about(self): | ||
| QtGui.QMessageBox.about(self, "About Image Viewer", | ||
| "<p>The <b>Image Viewer</b> example shows how to combine " | ||
| "QLabel and QScrollArea to display an image. QLabel is " | ||
| "typically used for displaying text, but it can also display " | ||
| "an image. QScrollArea provides a scrolling view around " | ||
| "another widget. If the child widget exceeds the size of the " | ||
| "frame, QScrollArea automatically provides scroll bars.</p>" | ||
| "<p>The example demonstrates how QLabel's ability to scale " | ||
| "its contents (QLabel.scaledContents), and QScrollArea's " | ||
| "ability to automatically resize its contents " | ||
| "(QScrollArea.widgetResizable), can be used to implement " | ||
| "zooming and scaling features.</p>" | ||
| "<p>In addition the example shows how to use QPainter to " | ||
| "print an image.</p>") | ||
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| def createActions(self): | ||
| self.openAct = QtGui.QAction("&Open...", self, shortcut="Ctrl+O", | ||
| triggered=self.open) | ||
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| self.printAct = QtGui.QAction("&Print...", self, shortcut="Ctrl+P", | ||
| enabled=False, triggered=self.print_) | ||
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| self.exitAct = QtGui.QAction("E&xit", self, shortcut="Ctrl+Q", | ||
| triggered=self.close) | ||
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| self.zoomInAct = QtGui.QAction("Zoom &In (25%)", self, | ||
| shortcut="Ctrl++", enabled=False, triggered=self.zoomIn) | ||
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| self.zoomOutAct = QtGui.QAction("Zoom &Out (25%)", self, | ||
| shortcut="Ctrl+-", enabled=False, triggered=self.zoomOut) | ||
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| self.normalSizeAct = QtGui.QAction("&Normal Size", self, | ||
| shortcut="Ctrl+S", enabled=False, triggered=self.normalSize) | ||
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| self.fitToWindowAct = QtGui.QAction("&Fit to Window", self, | ||
| enabled=False, checkable=True, shortcut="Ctrl+F", | ||
| triggered=self.fitToWindow) | ||
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| self.aboutAct = QtGui.QAction("&About", self, triggered=self.about) | ||
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| self.aboutQtAct = QtGui.QAction("About &Qt", self, | ||
| triggered=QtGui.qApp.aboutQt) | ||
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| def createMenus(self): | ||
| self.fileMenu = QtGui.QMenu("&File", self) | ||
| self.fileMenu.addAction(self.openAct) | ||
| self.fileMenu.addAction(self.printAct) | ||
| self.fileMenu.addSeparator() | ||
| self.fileMenu.addAction(self.exitAct) | ||
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| self.viewMenu = QtGui.QMenu("&View", self) | ||
| self.viewMenu.addAction(self.zoomInAct) | ||
| self.viewMenu.addAction(self.zoomOutAct) | ||
| self.viewMenu.addAction(self.normalSizeAct) | ||
| self.viewMenu.addSeparator() | ||
| self.viewMenu.addAction(self.fitToWindowAct) | ||
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| self.helpMenu = QtGui.QMenu("&Help", self) | ||
| self.helpMenu.addAction(self.aboutAct) | ||
| self.helpMenu.addAction(self.aboutQtAct) | ||
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| self.menuBar().addMenu(self.fileMenu) | ||
| self.menuBar().addMenu(self.viewMenu) | ||
| self.menuBar().addMenu(self.helpMenu) | ||
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| def updateActions(self): | ||
| self.zoomInAct.setEnabled(not self.fitToWindowAct.isChecked()) | ||
| self.zoomOutAct.setEnabled(not self.fitToWindowAct.isChecked()) | ||
| self.normalSizeAct.setEnabled(not self.fitToWindowAct.isChecked()) | ||
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| def scaleImage(self, factor): | ||
| self.scaleFactor *= factor | ||
| self.imageLabel.resize(self.scaleFactor * self.imageLabel.pixmap().size()) | ||
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| self.adjustScrollBar(self.scrollArea.horizontalScrollBar(), factor) | ||
| self.adjustScrollBar(self.scrollArea.verticalScrollBar(), factor) | ||
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| self.zoomInAct.setEnabled(self.scaleFactor < 3.0) | ||
| self.zoomOutAct.setEnabled(self.scaleFactor > 0.333) | ||
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| def adjustScrollBar(self, scrollBar, factor): | ||
| scrollBar.setValue(int(factor * scrollBar.value() | ||
| + ((factor - 1) * scrollBar.pageStep()/2))) | ||
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| if __name__ == '__main__': | ||
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| import sys | ||
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| app = QtGui.QApplication(sys.argv) | ||
| imageViewer = ImageViewer() | ||
| imageViewer.show() | ||
| sys.exit(app.exec_()) |
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