Romain,
Now that the FLAG_SUPPORT_STATIC_TRANSFORMATIONS flag is gone in the
1.0 SDK, what do you recommend for such a scenario?
Thanks,
Cheryl
On Aug 21, 10:30 am, Erik Calissendorff <[EMAIL PROTECTED]>
wrote:
> Thanks, that was a much easier way to modify the views at drawing.
>
> Some tips which I learned as I tested this approach:
>
> You indicate that the ViewGroup supports static transformation with:
> this.mGroupFlags = this.mGroupFlags |
> FLAG_SUPPORT_STATIC_TRANSFORMATIONS;
>
> For the modified transformation to be performed you should return true
> from:
> boolean getChildStaticTransformation(View child, Transformation t)
>
> Kindest regards,
>
> //Erik
>
> On Aug 14, 5:12 pm, "Romain Guy" <[EMAIL PROTECTED]> wrote:
>
> > You need to translate the canvas to the right position for each child
> > and take into account the scroll offsets. I highly advise against
> > overriding dispatchDraw() because it does a number of delicate things.
> > The next version of the SDK will make ViewGroup.drawChild() protected
> > so that you can override dispatchDraw() more safely.
>
> > To move, scale and apply transparency to your Views at drawing time,
> > it's a lot simpler than what you are doing. You can simply override
> > the getChildStaticTransformation() method (I'm not sure of the exact
> > name) and make sure your ViewGroup indicates it supports static
> > transformations. Then simply return the appropriate Transformation
> > that translates, scales and applies alpha. This is what Gallery does
> > for instance.
>
> > On Thu, Aug 14, 2008 at 5:15 AM, Erik Calissendorff
>
> > <[EMAIL PROTECTED]> wrote:
>
> > > I'm trying to draw the children manually in my custom ViewGroup but
> > > the code below only displays the left top most child. I have tried not
> > > to clip the canvas and simply just call the child draw(Canvas c)
> > > method directly but that results in that all children are drawn on top
> > > of each other.
>
> > > What I like to accomplish is to be able to manually move,scale and
> > > modify the transparency of theViewat each draw call from the parent.
>
> > > I hope that someone can inform me how to make this work.
>
> > > Below is a my onLayout and dispatchDraw functions as they are now.
>
> > > [EMAIL PROTECTED]
> > > protected void onLayout(boolean changed, int l, int t, int r, int
> > > b)
> > > {
> > > for(int i=0;i<this.getChildCount();i++)
> > > {
> > > Viewchild = this.getChildAt(i);
> > > Rectrect=this.mCellPositions[i];
> > >
> > > child.layout(rect.left,rect.top,rect.right,rect.bottom);
> > > }
> > > }
>
> > > [EMAIL PROTECTED]
> > > protected void dispatchDraw(Canvas canvas) {
> > > for(int i=0;i<this.getChildCount();i++)
> > > {
> > > Viewview= this.getChildAt(i);
> > > Rectcell=this.mCellPositions[i];
> > > canvas.save();
> > > if(canvas.clipRect(cell,Op.REPLACE))
> > > {
> > >
> > > if(!canvas.quickReject(view.getLeft(),view.getTop(),
> > >view.getRight(),view.getBottom(), EdgeType.BW))
> > > {
> > > view.draw(canvas);
> > > }
> > > }
> > > canvas.restore();
> > > }
> > > }
>
> > --
> > Romain Guywww.curious-creature.org
>
>
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