Adding a background image to an MDI area
On TheMailingList, Sarah Mount asked whether it was possible to display a non-tiled image in the background of an MDI area widget.
The following code uses the same technique that the qtconfig tool uses to place a message in the background of its preview widget. In this example, setting the centered attribute causes the image to be displayed in the centre of the background area; if unset, the image is scaled to fill the background area.
1 import sys
2 from PyQt4.QtCore import Qt
3 from PyQt4.QtGui import *
4
5 class MDIArea(QMdiArea):
6
7 def __init__(self, background_pixmap, parent = None):
8
9 QMdiArea.__init__(self, parent)
10 self.background_pixmap = background_pixmap
11 self.centered = False
12
13 def paintEvent(self, event):
14
15 painter = QPainter()
16 painter.begin(self.viewport())
17
18 if not self.centered:
19 painter.drawPixmap(0, 0, self.width(), self.height(), self.background_pixmap)
20 else:
21 painter.fillRect(event.rect(), self.palette().color(QPalette.Window))
22 x = (self.width() - self.display_pixmap.width())/2
23 y = (self.height() - self.display_pixmap.height())/2
24 painter.drawPixmap(x, y, self.display_pixmap)
25
26 painter.end()
27
28 def resizeEvent(self, event):
29
30 self.display_pixmap = self.background_pixmap.scaled(event.size(), Qt.KeepAspectRatio)
31
32
33 if __name__ == "__main__":
34
35 app = QApplication(sys.argv)
36
37 if len(app.arguments()) != 2:
38
39 sys.stderr.write("Usage: %s <image path>\n" % sys.argv[0])
40 sys.exit(1)
41
42 m = MDIArea(QPixmap(sys.argv[1]))
43 m.centered = True
44 m.show()
45 sys.exit(app.exec_())