Hi Antonio,
Yes I understood that with experimentation. I see that if I place the
glcanvasbox inside a scrollbox its the same behaviour but if I place the
glcanvas box inside a vbox which in turn is inside a scroll box then it
works by scrolling the children of the glcanvasbox but it still does not
simply scroll the canvas and calls its action call back to redraw it.
So I see even in the examples that the canvas is redrawn based on the
scroll position. This means that we are responsible to storing the content
of the canvas and rendering it all the time. Is that correct? How can this
be done efficiently where we just redraw the part of the canvas which
appears when scroll position is changed and not the portion which just
moved? This can be done when the scroll bar is moving and when it stops for
a half a sec then we can redraw the full thing instead of redrawing it all
the time.
I have figured out most of the components I need to implement all the
functionality, thanks.
Milind
On Tue, Aug 26, 2014 at 6:22 AM, Antonio Scuri <[email protected]>
wrote:
> The children in the glcanvasbox are designed to be placed as embedded
> controls, so they will not be affected by the scrollbar. The scrollbar is
> free to be used by what's being draw on the canvas, like a 3D model.
>
> If you want to use it in that way then you will need to configure your
> virtual world properly and when scroll_cb is called, to move the children
> of the glcanvasbox.
>
> Best,
> Scuri
>
>
>
> On Mon, Aug 25, 2014 at 4:48 PM, Milind Gupta <[email protected]>
> wrote:
>
>> Hi,
>> I am trying to use the scrollbar on the glcanvas box. I did
>> scrollbar="YES" when creating it. I don't have a scroll_cb defined. The
>> Scroll bar shows up but the scroll action does seem to be scroll the
>> canvasbox. My controls (I have a text box in there) remain stationery.
>> How can I get the scrolling action to work? I have attached my
>> test script.
>>
>> Thanks,
>> Milind
>>
>>
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>
>
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