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/*
* Copyright (C) 2016 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.launcher3;
import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.animation.ValueAnimator;
import android.animation.ValueAnimator.AnimatorUpdateListener;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.View;
import com.android.launcher3.Workspace.State;
/**
* A simple view used to show the region blocked by QSB during drag and drop.
*/
public class QsbBlockerView extends View implements Workspace.OnStateChangeListener {
private static final int VISIBLE_ALPHA = 100;
private final Paint mBgPaint;
public QsbBlockerView(Context context, AttributeSet attrs) {
super(context, attrs);
mBgPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mBgPaint.setColor(Color.WHITE);
mBgPaint.setAlpha(0);
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
Workspace w = Launcher.getLauncher(getContext()).getWorkspace();
w.setOnStateChangeListener(this);
prepareStateChange(w.getState(), null);
}
@Override
public void prepareStateChange(State toState, AnimatorSet targetAnim) {
int finalAlpha = getAlphaForState(toState);
if (targetAnim == null) {
mBgPaint.setAlpha(finalAlpha);
invalidate();
} else {
ObjectAnimator anim = ObjectAnimator.ofArgb(mBgPaint, "alpha", finalAlpha);
anim.addUpdateListener(new AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
invalidate();
}
});
targetAnim.play(anim);
}
}
private static int getAlphaForState(State state) {
switch (state) {
case SPRING_LOADED:
case OVERVIEW:
case OVERVIEW_HIDDEN:
return VISIBLE_ALPHA;
}
return 0;
}
@Override
protected void onDraw(Canvas canvas) {
canvas.drawPaint(mBgPaint);
}
}
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