[umbrello] [Bug 424861] New: Zoom control is very difficult on laptops a with touchpad
bugzilla_noreply at kde.org
Fri Jul 31 14:49:25 BST 2020
Bug ID: 424861
Summary: Zoom control is very difficult on laptops a with
Assignee: umbrello-devel at kde.org
Reporter: code at roberthairgrove.com
Target Milestone: ---
On laptop computers with touchpads, the slightest gesture sometimes causes big
jumps in the zoom factor.
STEPS TO REPRODUCE
1. Create a new diagram
2. Add an object
3. Try to move or resize the object using the touchpad
Zoom can go from 100% to minimum (5%?) with barely any motion.
No zoom action unless the slider is moved.
Linux Ubuntu 18.04.4
(available in About System)
Qt Version: 5.12.9
As mentioned on the mailing list, I discovered that it is possible to ignore
the overloaded QGraphicsView::wheelEvent() (in the file umlview.cpp) by simply
returning from the function at the beginning of the method body. Since the
wheel event zooming is probably a useful feature when there is actually a mouse
wheel, either the program should be able to automatically determine whether
zooming with the wheelEvent is appropriate or not. If it is not possible to
automatically determine (since Qt is sending wheel events from the touchpad), I
would suggest having a settings option in the GUI to turn this behavior on or
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