| /* |
| * 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); |
| } |
| } |