mirror of https://github.com/qt/qtbase.git
7378c709f5
On macOS, we don't deliver a press event for the first press on the
track pad (Qt::WA_TouchPadAcceptSingleTouchEvents is not set by default,
so Qt doesn't deliver a single-press on the track pad as a touch event -
that makes some sense or at least maintains compatibility). Because of
that, point 0 is never added to the finger-mapping hash.
When point 0 is then released, we didn't check if we found a valid
iterator for that point ID, and the example crashed.
Fix this by checking that we have a valid iterator before dereferencing,
and by handling Stationary events in the same way as pressed (add the
point to the mapping if it's not already there).
Pick-to: 6.6 6.5
Fixes: QTBUG-110266
Change-Id: I32337b801aaabf9b821a97ddc15ad78747b5e6a2
Reviewed-by: Jan Arve Sæther <jan-arve.saether@qt.io>
(cherry picked from commit
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| .. | ||
| affine | ||
| basicdrawing | ||
| composition | ||
| deform | ||
| gradients | ||
| imagecomposition | ||
| painterpaths | ||
| pathstroke | ||
| shared | ||
| transformations | ||
| CMakeLists.txt | ||
| README | ||
| painting.pro | ||
README
Qt's painting system is able to render vector graphics, images, and outline font-based text with sub-pixel accuracy accuracy using anti-aliasing to improve rendering quality. These examples show the most common techniques that are used when painting with Qt, from basic concepts such as drawing simple primitives to the use of transformations. Documentation for these examples can be found via the Examples link in the main Qt documentation.