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ToggelCommand dynamically assign state [message #817062]

Fri, 09 March 2012 15:38

ModelGeek Mising name

Messages: 550
Registered: June 2011

Senior Member

Hi,

i want to have a toggel type command (in popup menu) but i do not want to give default state(true|false), i want to decide that based on property of selected object at the run time. Is it possible to add this using extensions interface or i need to add menu programmatically?

cheer,

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Re: ToggelCommand dynamically assign state [message #825912 is a reply to message #817062]

Wed, 21 March 2012 12:12

Paul Webster

Messages: 6859
Registered: July 2009
Location: Ottawa

Senior Member

For toggle commands, their is a Command State object that controls the state. But that state is valid for the command globally. One option is to just use the global command state and update it on a selection changed using org.eclipse.ui.handlers.HandlerUtil.toggleCommandState(Command).

The other possible solution would be to have your handler be an IElementUpdater. On selection change you can call org.eclipse.ui.commands.ICommandService.refreshElements(String, Map). Your handler can use the selection to figure out if it should set the toggle to checked or not.

PW

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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