Hello,
I have a question (which may stem from either a bug in PyQt, Qt, or just
my understanding of how Qt is supposed to work). In particular,
according to the Qt documentation
(http://doc.trolltech.com/4.6/qwidget.html#setMask) masked widgets are
only supposed to receive mouse events on their visible portions. This
works fine on a normal widget in a GUI, but doesn't seem to be the case
if I add a widget to a QGraphicsScene via the addWidget method.
In particular, some example code is below (at the end of my message).
In this example I create two buttons, and place one in a QGraphicsScene
and the other as part of a normal layout. I then add a simple mask so
that only the left half of each button should be visible. The painting
of both buttons seems to be handled correctly (i.e. only the left half
gets painted), but the mouse events do not. In particular, if I click
the non-visible part (right half) of the normal-layout-button, nothing
happens. But if I click the invisible right half of the QGraphicsScene
button, the button still appears to be receiving the mouse click event.
So, my question is...is this a bug in PyQt? Or does the same behavior
happen under Qt in other languages? Or is it not a bug at all, and
QWidgets are not supposed to respect their masks with regard to mouse
events when added to QGraphicsScenes? Or am I just totally crazy? ;-)
Any advice or suggestions anyone can provide would be very much appreciated!
- Jeremy
Example Code:
from PyQt4.QtCore import Qt, QRect
from PyQt4.QtGui import QApplication, QMainWindow, QGraphicsScene,
QPushButton, QGraphicsView, QRegion, QWidget, QVBoxLayout
def gotAClick():
print "Got a click";
if __name__ == '__main__':
import sys
app = QApplication(sys.argv)
button1 = QPushButton("1111111");
button2 = QPushButton("2222222");
button1.clicked.connect(gotAClick)
button2.clicked.connect(gotAClick)
graphics_scene = QGraphicsScene();
graphics_view = QGraphicsView(graphics_scene);
graphics_scene.addWidget(button1)
window = QMainWindow();
main_widget = QWidget();
main_layout = QVBoxLayout();
main_layout.addWidget(graphics_view);
main_layout.addWidget(button2);
main_widget.setLayout(main_layout);
window.setCentralWidget(main_widget);
window.show();
button1.setMask(QRegion(QRect(0,0,button1.width()/2, button1.height())));
button2.setMask(QRegion(QRect(0,0,button2.width()/2, button2.height())));
sys.exit(app.exec_())
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