1 /**************************************************************************** 2 ** 3 ** Copyright (C) 2016 The Qt Company Ltd. 4 ** Contact: https://www.qt.io/licensing/ 5 ** 6 ** This file is part of the examples of Qt for Python. 7 ** 8 ** $QT_BEGIN_LICENSE:BSD$ 9 ** Commercial License Usage 10 ** Licensees holding valid commercial Qt licenses may use this file in 11 ** accordance with the commercial license agreement provided with the 12 ** Software or, alternatively, in accordance with the terms contained in 13 ** a written agreement between you and The Qt Company. For licensing terms 14 ** and conditions see https://www.qt.io/terms-conditions. For further 15 ** information use the contact form at https://www.qt.io/contact-us. 16 ** 17 ** BSD License Usage 18 ** Alternatively, you may use this file under the terms of the BSD license 19 ** as follows: 20 ** 21 ** "Redistribution and use in source and binary forms, with or without 22 ** modification, are permitted provided that the following conditions are 23 ** met: 24 ** * Redistributions of source code must retain the above copyright 25 ** notice, this list of conditions and the following disclaimer. 26 ** * Redistributions in binary form must reproduce the above copyright 27 ** notice, this list of conditions and the following disclaimer in 28 ** the documentation and/or other materials provided with the 29 ** distribution. 30 ** * Neither the name of The Qt Company Ltd nor the names of its 31 ** contributors may be used to endorse or promote products derived 32 ** from this software without specific prior written permission. 33 ** 34 ** 35 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 36 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 37 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 38 ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 39 ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 40 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 41 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 42 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 43 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 44 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 45 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." 46 ** 47 ** $QT_END_LICENSE$ 48 ** 49 ****************************************************************************/ 50 51 from PySide2.QtCore import * 52 from PySide2.QtGui import * 53 import sys 54 55 class MyScrollArea (QAbstractScrollArea): 56 widget = None 57 58 def __init__(widget): 59 self.setWidget(widget); 60 61 def setWidget(w): 62 self.widget = w; 63 self.widget.setParent(viewport()); 64 if not self.widget.testAttribute(Qt.WA_Resized): 65 self.widget.resize(widget.sizeHint()) 66 67 self.verticalScrollBar().setValue(0) 68 self.verticalScrollBar().setValue(0) 69 70 self.updateArea() 71 72 73 def updateWidgetPosition(): 74 //! [0] 75 hvalue = self.horizontalScrollBar().value() 76 vvalue = self.verticalScrollBar().value() 77 topLeft = self.viewport().rect().topLeft() 78 79 self.widget.move(topLeft.x() - hvalue, topLeft.y() - vvalue) 80 //! [0] 81 82 83 def scrollContentsBy(dx, dy): 84 self.updateWidgetPosition() 85 86 def updateArea(): 87 //! [1] 88 areaSize = viewport().size() 89 widgetSize = widget.size() 90 91 self.verticalScrollBar().setPageStep(widgetSize.height()) 92 self.horizontalScrollBar().setPageStep(widgetSize.width()) 93 self.verticalScrollBar().setRange(0, widgetSize.height() - areaSize.height()) 94 self.horizontalScrollBar().setRange(0, widgetSize.width() - areaSize.width()) 95 self.updateWidgetPosition() 96 //! [1] 97 98 def resizeEvent(QResizeEvent): 99 self.updateArea() 100 101 app = QApplication(sys.argv) 102 pixmap = QPixmap("mypixmap.png") 103 label = QLabel() 104 label.setPixmap(pixmap) 105 area = MyScrollArea(label) 106 area.resize(300, 300) 107 area.show() 108 109 area.setWidget(label) 110 111 app.exec_(); 112 113