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eclipse-windowbuilder / windowbuilder

Eclipse Windowbuilder
https://projects.eclipse.org/projects/tools.windowbuilder
Eclipse Public License 1.0
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Fix: Wrong coordinates when calculating location of Swing components #861

Closed ptziegler closed 4 months ago

ptziegler commented 4 months ago

A race condition may occur when calculating the relative location of a Swing component relative to its parent component. The way we calculate this value is by subtracting the screen location of the child from the screen location of the parent. Because those locations are fetched independent from one another, it may happen that the window is moved between those requests, introducing a ficticious offset.

To avoid this issue, both locations have to be fetched at the same time, for which a new method getRelativeLocation() has been added to the SwingUtils class.

ptziegler commented 4 months ago

This is what the problem looks like: I've added a new JSplitPane to the content pane and suddenly, everything has been shifted down by ~100 pixels:

image