2) Define "priorities". For example: if both the left and right
buttons are pressed, report that a drag for the left button (I guess
OSG 1.0 did something like this). This is pretty simple to implement,
and would be good enough for my needs.
What if the programmer wants to know when both left and right
mousebutton is down? I think it would be better to add more options to
the event. Rather than limit it. ie.
Lbutton down = 1
Rbutton down = 2
Mbutton down = 4
L+Rbutton = 3
L+Mbutton = 5
R+Mbutton = 6
MVH David
On 7/12/06, Leandro Motta Barros <[EMAIL PROTECTED]> wrote:
On 7/12/06, Robert Osfield <[EMAIL PROTECTED]> wrote:
> Hi Leandro,
>
> On 7/12/06, Leandro Motta Barros <[EMAIL PROTECTED]> wrote:
> > I compiled it cleanly under Linux, and noticed just one problem when
> > using an 'osgGA::GUIEventHandler' and handling DRAG events. When I
> > call 'getButton()', it is not returning any of the mouse button
> > constants ('LEFT_MOUSE_BUTTON' and the like). For other mouse events,
> > this works.
> >
> > Is this a bug or the behavior changed for some reason?
>
> Just looking at the code in src/osgGA/EventQueue.cpp, the method that
> generates the drag event is EventQueue::mouseMotion(float x, float y),
> and it internals checks the accumulated button mask to determin it the
> motion is a drag or a move.
>
> While the code has the correct button mask it won't neccesarily know
> what button should be associatedwith the event. If only one button is
> pressed in the button mask then it'll be obvious, but what if there is
> more than one button pressed?
Humm... I see. I noticed this because we have some code relying on the
button pressed while dragging, and this has broken with OSG 1.1. So,
it seems that OSG 1.0 had some rule to define which button to report.
A can think of the following possible "fixes" for this:
1) If multiple buttons are pressed, generate one "drag" events for
each button pressed. I have barely skimmed through, but this seems to
require larger changes to the event handling code.
2) Define "priorities". For example: if both the left and right
buttons are pressed, report that a drag for the left button (I guess
OSG 1.0 did something like this). This is pretty simple to implement,
and would be good enough for my needs.
If option 2 is OK, I can implement it and submit the patch.
Cheers,
LMB
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