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POQt fitInView and resizing
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copied!<p>I am trying to make a <code>QGraphicsView</code> with same width as height positioned in center of the window.</p> <p>I created a ordinary <code>QGraphicsView</code> in Qt Designer and set minimal size, added some calculations that center the <code>QGraphicsView</code> into center of the main window and that set the same width as height. It uses only <code>setGeometry</code>. Than I created a <code>QGraphicsScene</code> with only one very long rectangle. I want the graphics scene to fit to view so I have used <code>QGraphicsView::fitInView</code>. Everything works OK, but the problem cames with resizing window.</p> <p>When I increase height and width of the window everything also works fine. The <code>QGraphicsView</code> has a new position and a new size. When I reduce only a part of size of the window everything still works fine. But (finally) when I reduce the size of window to the possible minimum everything breaks. The rectangle in view has the right width (the same as without resizing, I have measured it with a ruler :) ), but a new margin is created and also <code>QGraphicsView</code> is not positioned and sized right (so it is not only the margin, but maybe also the <code>setGeometry</code> has no effect).</p> <p>I have noticed, that the same thing happens when I call <code>QGraphicsView::fitInView</code> before using <code>setGeometry</code>.</p> <p>It is getting me crazy, please help!</p> <p>Here is some code:</p> <pre><code>void MainWindow::resizeEvent(QResizeEvent *e) { int h = e->size().height(), w = e->size().width(), s; if(w > h) s = h-120; else s = w-120; ui->board->setGeometry((w-s)/2,(h-s)/2,s,s); int scaleWidth = ui->board->scene()->width(), scaleHeight = ui->board->scene()->height(); ui->board->fitInView(QRectF(0, 0, scaleWidth, scaleHeight), Qt::KeepAspectRatio); } </code></pre> <p>Here are images of what happens to <code>QGraphicsView</code>, the rectangle is red, view is blue:</p> <p><img src="https://i.stack.imgur.com/8Sj5l.png" alt="this is OK"> <img src="https://i.stack.imgur.com/pqdPf.png" alt="this is broken"></p>

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