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Best strategy to bind handler to a control [message #327855]

Tue, 06 May 2008 13:46

Teddy Walker

Messages: 18
Registered: July 2009

Junior Member

What is the best strategy to activate command handlers for a single
control? For example, bind a special handler for the copy command to
each control in a form or a dialog. Three ideas:

1) Use IServiceLocatorCreator to create a handler service for each
control and activate/deactivate the ServiceLocator on focus change
- internal code, will it be public in future versions?
- it works

2) Create an expression for each control, use it when register the
handlers and reevaluate it on focus change
- does this work?

3) Write a "wrapper handler" selecting the handler of the control which
has the focus
- requires most new code

Teddy

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Re: Best strategy to bind handler to a control [message #327958 is a reply to message #327855]

Fri, 09 May 2008 13:45

Paul Webster

Messages: 6859
Registered: July 2009
Location: Ottawa

Senior Member

Within one context (like your dialog or form), one common pattern is to
activate one handler and have it delegate to different controls in
focus. Similar to org.eclipse.ui.actions.TextActionHandler for actions.

Another way would be to use the IFocusService to register the controls
that can accept focus, and then use IHandlerService to activate the
handlers for those controls (also available declaratively while using
org.eclipse.ui.handlers)

PW

--
Paul Webster
http://wiki.eclipse.org/Platform_Command_Framework
http://wiki.eclipse.org/Command_Core_Expressions
http://wiki.eclipse.org/Menu_Contributions
http://wiki.eclipse.org/Menus_Extension_Mapping
http://help.eclipse.org/help33/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: Best strategy to bind handler to a control [message #328257 is a reply to message #327958]

Tue, 20 May 2008 12:04

Teddy Walker

Messages: 18
Registered: July 2009

Junior Member

Hi Paul,

thank you very much. I didn't know IFocusService - it works fine!

Teddy

Paul Webster wrote [2008-05-09 15:45]:
> Within one context (like your dialog or form), one common pattern is to
> activate one handler and have it delegate to different controls in
> focus. Similar to org.eclipse.ui.actions.TextActionHandler for actions.
>
> Another way would be to use the IFocusService to register the controls
> that can accept focus, and then use IHandlerService to activate the
> handlers for those controls (also available declaratively while using
> org.eclipse.ui.handlers)
>
> PW
>
>

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