Review request for 7124430: [macosx] LWCToolkit.grab() and LWCToolkit.ungrab() events are not implemented yet

[Anthony Petrov]

Overriding NSWindow -sendEvent: does allow one to catch mouse click 
events on the Mac. We use this technique in JavaFX for grab/ungrab 
functionality, and everything works smoothly.

Anton was just trying to override NSApplication -sendEvent: which indeed 
won't help in that case (note the class name difference).

--
best regards,
Anthony

On 1/13/2012 9:34 PM, Mike Swingler wrote:
> Don't worry about trying to catch the window title bar frame, you really can't, and you shouldn't try. The titlebar/toolbar area is specially marked so that the WindowServer will still allow the window to be movable, even if the app is spinning and non-responsive. Due to this fact, the app is infrequently notified when it's window is being moved, because that app isn't even involved.
> 
> Regards,
> Mike Swingler
> Apple Inc.
> 
> On Jan 13, 2012, at 7:49 AM, Anton V. Tarasov wrote:
> 
>> Hi Anthony,
>>
>> Thanks for the tip. Though I did look through some forum discussions where people asked question
>> "is it possible to catch a mouse down event in a frame's titlebar?" The answer was "not a direct way".
>> Commonly, a suggestion is to workaround it by means of -windowWillMove usage, but this looks quite
>> odd to me...
>>
>> For instance:
>>
>> http://www.cocoabuilder.com/archive/cocoa/6725-catching-mousedown-in-an-nswindow-titlebar.html
>>
>> "PS: I have tried to overiding -sendEvent in the instance of a subclass
>> of NSApplication object to see what events are going thru, mouseDown
>> and mouseUp events in the titlebar don't go thru. It's seem that the
>> windows are moved directly by the WindowServer, as you explained me."
>>
>> Did you have an experience of trying it yourself?
>>
>> Thanks,
>> Anton.
>>
>> On 1/13/12 4:58 PM, Anthony Petrov wrote:
>>> Hi Anton,
>>>
>>> You want to override NSWindow -sendEvent: in order to catch clicks on the titlebar of windows on the Mac.
>>>
>>> -- 
>>> best regards,
>>> Anthony
>>>
>>> On 1/13/2012 6:36 PM, Anton V. Tarasov wrote:
>>>> Hello,
>>>>
>>>> Please review a fix for 7124430.
>>>>
>>>> webrev: http://cr.openjdk.java.net/~ant/7124430/webrev.1/
>>>>
>>>> UngrabEvent dispatching is implemented according to the cases mentioned
>>>> in the UngrabEvent class description, except for the case of clicking
>>>> in an owner frame's title. The latter, as I found, can't be implemented
>>>> on Mac OS X platform. Along with the implementation, a regression test
>>>> is proposed.
>>>>
>>>> Thanks,
>>>> Anton.
>>>>
>>>>
>