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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.server.policy;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.View;
import android.widget.LinearLayout;
/**
* A vertical linear layout. However, instead of drawing the background
* behnd the items, it draws the background outside the items based on the
* padding. If there isn't enough room to draw both, it clips the background
* instead of the contents.
*/
public class RecentApplicationsBackground extends LinearLayout {
private static final String TAG = "RecentApplicationsBackground";
private boolean mBackgroundSizeChanged;
private Drawable mBackground;
private Rect mTmp0 = new Rect();
private Rect mTmp1 = new Rect();
public RecentApplicationsBackground(Context context) {
this(context, null);
init();
}
public RecentApplicationsBackground(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
private void init() {
mBackground = getBackground();
setBackgroundDrawable(null);
setPadding(0, 0, 0, 0);
setGravity(Gravity.CENTER);
}
@Override
protected boolean setFrame(int left, int top, int right, int bottom) {
setWillNotDraw(false);
if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) {
mBackgroundSizeChanged = true;
}
return super.setFrame(left, top, right, bottom);
}
@Override
protected boolean verifyDrawable(Drawable who) {
return who == mBackground || super.verifyDrawable(who);
}
@Override
public void jumpDrawablesToCurrentState() {
super.jumpDrawablesToCurrentState();
if (mBackground != null) mBackground.jumpToCurrentState();
}
@Override
protected void drawableStateChanged() {
Drawable d = mBackground;
if (d != null && d.isStateful()) {
d.setState(getDrawableState());
}
super.drawableStateChanged();
}
@Override
public void draw(Canvas canvas) {
final Drawable background = mBackground;
if (background != null) {
if (mBackgroundSizeChanged) {
mBackgroundSizeChanged = false;
Rect chld = mTmp0;
Rect bkg = mTmp1;
mBackground.getPadding(bkg);
getChildBounds(chld);
// This doesn't clamp to this view's bounds, which is what we want,
// so that the drawing is clipped.
final int top = chld.top - bkg.top;
final int bottom = chld.bottom + bkg.bottom;
// The background here is a gradient that wants to
// extend the full width of the screen (whatever that
// may be).
int left, right;
if (false) {
// This limits the width of the drawable.
left = chld.left - bkg.left;
right = chld.right + bkg.right;
} else {
// This expands it to full width.
left = 0;
right = getRight();
}
background.setBounds(left, top, right, bottom);
}
}
mBackground.draw(canvas);
if (false) {
android.graphics.Paint p = new android.graphics.Paint();
p.setColor(0x88ffff00);
canvas.drawRect(background.getBounds(), p);
}
canvas.drawARGB((int)(0.75*0xff), 0, 0, 0);
super.draw(canvas);
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
mBackground.setCallback(this);
setWillNotDraw(false);
}
@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
mBackground.setCallback(null);
}
private void getChildBounds(Rect r) {
r.left = r.top = Integer.MAX_VALUE;
r.bottom = r.right = Integer.MIN_VALUE;
final int N = getChildCount();
for (int i=0; i<N; i++) {
View v = getChildAt(i);
if (v.getVisibility() == View.VISIBLE) {
r.left = Math.min(r.left, v.getLeft());
r.top = Math.min(r.top, v.getTop());
r.right = Math.max(r.right, v.getRight());
r.bottom = Math.max(r.bottom, v.getBottom());
}
}
}
}
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