[news.eclipse.platform.swt] Re: Please Help: Detecting swt-composite via

["Veronika Irvine" <veronika_irvine@xxxxxxx>]

> But I'm not able to do this, since I have to set the enabled()-property of 
> the canvas to "false" in order to have the ScrolledComposite's 
> mouselistener to react.

Setting the canvas to not be enabled is a bad idea.  Why are you doing this? 
What is the problem you are working around?


"Boris Munivrana" <bmunivrana@xxxxxx> wrote in message 
news:005662a44c002ba7544a65befe16ee14$1@xxxxxxxxxxxxxxxxxx
> Hi there,
>
> I need some help with this issue:
> I have to write an UI where the user is allowed to schedule appointments.
> Therefor, I sublcassed swt-canvas, wich draws a grid. My canvas is 
> embedded within a ScrolledComposite.
> Each appointment is represented by a subclass of Composite.
> I registered a MouseListener at the ScrolledComposite and thus enabling 
> the user to move the "appointments" ( a.k.a. one specific Composite which 
> i instantiated and passed over to the MouseListener of the 
> ScrolledComposite for testing purposes) to specified rows and columns.
> This works fine so far, but my code until now isn't anything more than a 
> raw sketch.
> Of course there is a need for my scheduler to notify which of the 
> composites has been "grabbed" with the mouse, e.g. when the mouse hovers 
> over it and a mousedown-event occurs.
> But I'm not able to do this, since I have to set the enabled()-property of 
> the canvas to "false" in order to have the ScrolledComposite's 
> mouselistener to react.
> And I cannot register a MouseTrackListener to the appointment-composites, 
> since they are direct children of the disabled canvas.
>
> So, basically, what I'm trying to accomplish is something like a chess 
> game, there's a grid and I want to let the user move the elements on the 
> "chess board".
>
> Any help (e.g. pseudo-code) would be great. The elements that have to be 
> involved are:
>
> 1) a canvas on which the grid is drawn
> 2) a scrolledcomposite which holds the canvas
> 3) several composites which represent an element that can be moved.
>
> Thanks,
>
> Boris Munivrana
>