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Limiting dimensions of view folders / views [message #520998]

Tue, 16 March 2010 07:03

Andrei Lissovski

Messages: 13
Registered: July 2009

Junior Member

Hi,

In my RCP application, I would like to constrain min/max width for specific vertically oriented view folders. Similarly, I would like to constrain min/max height for specific horizontally oriented view folders / views. The effect to the user should be such that it is impossible to drag the sash separating the parts / part folders outside of these constraints.

Ideally, I would like to be able to impose these constraints dynamically in a way that would let me veto resizes based on the current state of my UI. In absence of that, I could live with hard constraints in pixels or ratios between relevant part dimensions.

Possibly of relevance, my application uses a custom presentation.

I have done a fair amount of digging in the platform code and searching but so far to no avail. Would appreciate the help from the community. Any pointers are welcome.

Thanks a lot!

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Re: Limiting dimensions of view folders / views [message #521091 is a reply to message #520998]

Tue, 16 March 2010 12:35

Paul Webster

Messages: 6859
Registered: July 2009
Location: Ottawa

Senior Member

You can make a fixed perspective, and then the ratios won't change at
all (and there's no dragging).

There's also org.eclipse.ui.ISizeProvider which views can implement, as
a hint to the perspective layout code.

PW

--
Paul Webster
http://wiki.eclipse.org/Platform_Command_Framework
http://wiki.eclipse.org/Command_Core_Expressions
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http://wiki.eclipse.org/Menus_Extension_Mapping
http://help.eclipse.org/galileo/index.jsp?topic=/org.eclipse .platform.doc.isv/guide/workbench.htm

Paul Webster
http://wiki.eclipse.org/Platform_Command_Framework
http://wiki.eclipse.org/Command_Core_Expressions
http://wiki.eclipse.org/Menu_Contributions

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Re: Limiting dimensions of view folders / views [message #521281 is a reply to message #521091]

Wed, 17 March 2010 04:42

Andrei Lissovski

Messages: 13
Registered: July 2009

Junior Member

Thanks Paul, your ISizeProvider suggestion got me on the right track.

For posterity, your custom presentation must be overriding getSizeFlags() and computePreferredSize() off the org.eclipse.ui.ISizeProvider. The contract is somewhat dense but the key is that (for example, in the case of constraining min/max width) the max dimension must be returned for the computePreferredSize(true, INFINITE, someWidth, INFINITE) invocation, and the min dimension must be returned for the computePreferredSize(true, INFINITE, someWidth, 0) invocation. The getSizeFlags(true) must return SWT.MIN | SWT.MAX.

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