Обсуждение: Detecting mouse events in the SQL grid

On Sun, 2013-02-17 at 12:21 -0800, Kari Karkkainen wrote:
> Hi,
>
> I'm trying to add some additional mouse event detection into the SQL grid, but I'm not succeeding. Besides pgAdmin,
alsowxWidgets is new to me, so I'm probably missing something obvious... 
>
> The grid was already detecting EVT_MOUSEWHEEL, so I tried to use that as my guideline:
>
> In ctlSQLGrid.h for the ctlSQLGrid class I added two private functions on the bottom:
> private:
> void OnCopy(wxCommandEvent &event);
> void OnMouseWheel(wxMouseEvent &event);
> void OnMouseLeftDown(wxMouseEvent &event);
> void OnMouseLeftUp(wxMouseEvent &event);
>
> In ctlSQLGrid.cpp I added two events:
> BEGIN_EVENT_TABLE(ctlSQLGrid, wxGrid)
> EVT_MENU(MNU_COPY, ctlSQLGrid::OnCopy)
> EVT_MOUSEWHEEL(ctlSQLGrid::OnMouseWheel)
> EVT_LEFT_DOWN(ctlSQLGrid::OnMouseLeftDown)
> EVT_LEFT_UP(ctlSQLGrid::OnMouseLeftUp)
> END_EVENT_TABLE()
>
> An then in ctlSQLGrid.cpp I defined the functions e.g. like this:
> void ctlSQLGrid::OnMouseLeftUp(wxMouseEvent &event)
> {
> SetTotals();
> }
>
> However, I never hit these functions by clicking the mouse, and I don't understand why. Would really appreciate any
advice.
>

Are you sure it's not already dealt with at the window level?


--
Guillaume
http://blog.guillaume.lelarge.info
http://www.dalibo.com

On Sat, 2013-02-23 at 08:04 -0800, Kari Karkkainen wrote:
> Hi Guillaume,
>
>
> No, I don't know if it is dealt with at the window level. I also
> thought that this could be the issue, i.e. that the event is
> intercepted and handled somewhere else, but I could not find out where
> that might be. Any advice?
>

Well, as you didn't send a patch, I don't know much what you tried. I
would add some code in the ctlSQLGrid::OnMouseLeftUp method to log
something (either on a message box or on a log file). Just to make sure
it got the event. If it didn't, I would try to suppress all mouse event
handling in the test window.

> Also, one (probably basic) thing is unclear to me: If I handle this
> mouse event (or most other input events), do I then prevent the event
> from being managed by its default handler, which maybe I need to
> invoke from my event handler to make sure no default behavior is
> missed?
>

AFAIK, if you intercept the event, you deal with it. Then you decide to
let the next layer take care of it... or not. It's your choice.


--
Guillaume
http://blog.guillaume.lelarge.info
http://www.dalibo.com