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Re: Kicad Tool Framework


On 08/13/2013 07:09 AM, Dick Hollenbeck wrote:
>> I find track laying impossible without mouse warping... there is an
>> option to disable it. But how could you *emulate* it, if there is no way
>> to physically move the pointer? 
> The OS+native windowing system will move the mouse coordinates in the next mouse move event.
> Your tool, if pushed onto the wxEvtHandler stack, I am thinking should have first access
> to ALL events, (~captured mouse) so as long as you retain state information the next call
> to ProcessEvent(), possibly routed to TOOL::OnMouseMove(), you can/could in there redraw
> the mouse cursor at the new desired location, or not.
> See wxEventLoopBase in http://docs.wxwidgets.org/trunk/classwx_event_loop_base.html
> This class sucks events out of the os queue, and gets first dibs on any events, it is the
> first recipient of any OS events when it is alive, and dispatching happens from here.
> If simply residing topmost on the wxEvtHandler stack does not give you enough control,
> then there is the option to create another wxEventLoopBase temporarily.

Here are some nice graphics and explanation of PushEventHandler:


It is my thinking that putting this in the wxFrame, by calling its PushEventHandler will
give you first dibs on all events.  If you follow the wEvent::Skip() protocol, and not
process events not pertinent to you, and I think this means knowing the client window area
coord and checking mouse events against that box, then any wxEvent can still find its way
to its normal destination outside the tool.

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