Hi,
I need a layout to open with an effect of expanding opening. The
layout grows until it takes the whole screen, but the content is not
scaled.
So I make a layout, override the onDraw, clipRect with a Rect that
grows with a timer.
Until there it works.
But once the layout is fully expanded, it redraws because it contains
a webview with javascript animation. In the "background" of my layout,
I have drawn a slight gray overlay or background using:
canvas.drawArgb(70, 127, 127, 127) method in onDraw().
The problem is, since onDraw() is called again, the background goes
darker, until it is completely gray, it looses its transparency.
I don't manage to avoid this problem.
If I put a background to the layout, it is shown on the whole layout
as soon as it is drawn, so the clipRect does not affect the
background, this is not the behaviour I need...
[code]
private class ExpandedLayout extends RelativeLayout {
private int topRect, bottomRect, leftRect, rightRect;
private int initTopRect, initBottomRect, initLeftRect,
initRightRect;
private Timer viewTimer;
private TimerTask updateMaskTask;
public ExpandedLayout(Context context) {
super(context);
topRect = 0;
bottomRect = screenHeight;
}
public void setBounds(int topInit, int bottomInit, int
leftInit, int
rightInit) {
topRect = topInit;
bottomRect = bottomInit;
leftRect = leftInit;
rightRect = rightInit;
initTopRect= topInit;
initBottomRect = bottomInit;
initLeftRect= leftInit;
initRightRect = rightInit;
}
public void show() {
viewTimer = new Timer();
updateMaskTask = new TimerTask(){
@Override
public void run() {
if (topRect > 0) {
topRect = (topRect-1 < 0) ? 0 :
(topRect-1);
}
if (bottomRect < screenHeight) {
bottomRect = (bottomRect+1 >
screenHeight) ? screenHeight :
(bottomRect+1);
}
if (leftRect > 0) {
leftRect = (leftRect-1 < 0) ? 0
: (leftRect-1);
}
if (rightRect < screenWidth) {
rightRect = (rightRect+1 >
screenWidth) ? screenWidth :
(rightRect+1);
}
postInvalidate();
if ( (topRect == 0) && (bottomRect ==
screenHeight) && (leftRect
== 0) && (rightRect == screenWidth) ) {
updateMaskTask.cancel();
viewTimer.cancel();
postInvalidate();
}
}
};
viewTimer.schedule(updateMaskTask, 200,5);
}
public void hide() {
viewTimer = new Timer();
updateMaskTask = new TimerTask(){
@Override
public void run() {
if (topRect < initTopRect) {
topRect = (topRect+1 >
initTopRect) ? initTopRect : (topRect+1);
}
if (bottomRect > initBottomRect) {
bottomRect = (bottomRect-1 <
initBottomRect) ? initBottomRect :
(bottomRect-1);
}
if (leftRect < initLeftRect) {
leftRect = (leftRect+1 >
initLeftRect) ? initLeftRect : (leftRect
+1);
}
if (rightRect > initRightRect) {
rightRect = (rightRect-1 <
initRightRect) ? initRightRect :
(rightRect-1);
}
if ( (topRect == initTopRect) &&
(bottomRect == initBottomRect)
&&
(leftRect ==
initLeftRect) && (rightRect == initRightRect)) {
updateMaskTask.cancel();
viewTimer.cancel();
}
postInvalidate();
}
};
viewTimer.schedule(updateMaskTask, 200,5);
}
@Override
protected void onDraw(Canvas canvas) {
canvas.clipRect(new Rect(0, topRect, screenWidth,
bottomRect),
Region.Op.REPLACE);
canvas.drawArgb(70, 127, 127, 127);
super.onDraw(canvas);
}
}
[/code]
Thanks.
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