Re: XUL tree views and "PerformAction" again

понедельник, 3 декабря 2012 г., 3:04:35 UTC+4 пользователь Neil написал:
> YuLo wrote:
> 
> 
> 
> >I made XPCOM(c++) implementing nsITreeView interface.
> 
> >I can create its instance in JavaScript and then call method PerformAction("..."). Sure, it works.
> 
> >
> 
> >But can it be done automatically when i press some keys, for instance "Delete"?
> 
> >
> 
> >I have some tree widgets in a window, it could be fine if XULRUNNER call "PerformAction" of the focussed widget.
> 
> >  
> 
> >
> 
> The standard way to make a keypress depend on the focused widget is as 
> 
> follows:
> 
> 
> 
>    1. Create a XUL <key keycode="VK_DELETE"
> 
>       oncommand="goDoCommand('cmd_delete');"/> (I think goDoCommand is
> 
>       in globalOverlay.js)
> 
>    2. Attach an nsIController object to your tree element's controllers
> 
>       property (it may be convenient for your C++ nsITreeView object to
> 
>       implement this interface too, or you could obtain a reference to
> 
>       your tree view in another way).
> 
>    3. The nsIController object should
> 
>          1. only respond true to supportsCommand('cmd_delete') and any
> 
>             other commands that you actually support
> 
>          2. respond true to isCommandEnabled if it's safe to run the command
> 
>          3. actually perform the action when doCommand is called
> 
> 
> 
> Then when the delete key is pressed, the JavaScript code will invoke the 
> 
> cmd_delete command on the focused element. (I use cmd_delete because it 
> 
> works for text elements too.)
> 
> 
> 
> -- 
> 
> Warning: May contain traces of nuts.

Thank you, Neil,
i didn't know about nsIController before.
On weekend, before you answered me, i made as follow:
1. <key keycode="VK_DELETE" oncommand="xpcomComponent.command('VK_DELETE')" and others in XUL file
2. in function "command" of new XPCOM i GetActiveElement and check whether it is "tree". If yes, i take treeView object as you explained me in my previous post. Then i call PerformAction of the tree view object.

I think it is a good idea to use nsIController, i'll learn about it.
Thanks again.
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