[solved] Center QWidget in QLayout
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I have a QGraphicsView in a QVBoxLayout (the only item) and that layout is set to the central widget of a QMainWindow. The QGraphicsView is set to a fixed size and is smaller than the QMainWindow. The layout is doing it's magic fine and the QGraphicsView is perfectly centered. [Image 1]
So far so good. Now I do a resize() event on the QGraphicsView. The widget is being resized correctly but now it sticks to the upper left corner of the layout. [Image 2]
How can I fix this? I want the QGraphicsView widget to be centered as in the initial state all the time.
Image 1: http://paste.ugfx.org/sores/99d72c7fc3e2/d756da7972c2.jpg
Image 2: http://paste.ugfx.org/sores/99d72c7fc3e2/ef133f1d6c08.jpg~ Tectu
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Can you post the code that sets the layout, adds the widget to the layout, sets the fixed size and calls resize? My guess is that you don't set a layout or the central widget properly or the graphics view somehow becomes layoutless (if that's even a word).
When adding the widget make sure you pass Qt::AlignCenter to the addWidget() call of the layout.
If you set the size using setFixedSize() then resize() won't work. You can call setFixedSize() again. -
Thank you very much for your quick answer. Here's the related code:
MainWindow: http://paste.ugfx.org/show/e7834cb915
MyGraphicsView: http://paste.ugfx.org/show/e4a74afb40I did layout->setAlignment(Qt::AlignCenter) before but then just the upper left corner of the widget is at the center of the layout. What I actually need is that the center of the widget is at the center of the layout.
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bq. I did layout->setAlignment(Qt::AlignCenter) before
This sets the alignment of the layout, not the widget inside it. Instead set the alignment when you add the widget to the layout:
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layout->addWidget(_activeDisplayPageView, 0, Qt::AlignCenter);
@Also setFixedSize() is basically calling setMinimumSize and setMaximumSize with the same value so you can replace this:
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setMinimumSize(QSize( 10, 10));
setMaximumSize(QSize(10000, 10000));
resize(DEFAULT_SCREEN_WIDTHfactor, DEFAULT_SCREEN_HEIGHTfactor);
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with this:
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setFixedSize(DEFAULT_SCREEN_WIDTHfactor, DEFAULT_SCREEN_HEIGHTfactor);
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