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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