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Bug 194024

Summary:	Lightweight system appears to have a problem setting bounds on a contained viewport in certain scenarios
Product:	[Tools] GEF	Reporter:	Chris McGee <cbmcgee>
Component:	GEF-Legacy Draw2d	Assignee:	gef-inbox <gef-inbox>
Status:	RESOLVED INVALID	QA Contact:
Severity:	normal
Priority:	P3	CC:	nyssen
Version:	3.3
Target Milestone:	---
Hardware:	PC
OS:	Windows XP
Whiteboard:

Description Chris McGee

2007-06-22 14:19:09 EDT

I am currently working with a graphical viewer, which uses a viewport underneath the root figure. In certain scenarios when I bring the viewer up, it does not set the bounds on the viewport properly. This often happens when eclipse quickly resizes the toolbars at the top. This causes some unnecessary scrollbars to appear. Note that when stretching the viewer after it has been shown, the problem appears to correct itself.

I have observed that the viewport and/or other figures in the containment tree underneath the viewport are not invalidated and retain their same invalid bounds (and client area).

To workaround the problem, I have subclassed the LightweightSystem and overrode the controlResized() method to invalidate the root figure's entire subtree to force all preferred sizes to be recalculated and the bounds to be set properly given the current FigureCanvas size. I notice that the default behvaiour of the LightweightSystem is to revalidate (ie. invalidate) only the root figure.

Comment 1 Randy Hudson

2007-06-25 10:59:07 EDT

If you are using "Freeform" viewport, layers, etc., it is impossible for the scrollbars to be in auto mode. You must force the scrollbars to be always visible, or you will get infinite layouts in the boundary cases.

Comment 2 Alexander Nyßen

2014-08-09 07:10:46 EDT

Resolving as INVALID due to comment #1.