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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.launcher3.util;
     18 
     19 import android.graphics.Rect;
     20 import android.view.ViewOutlineProvider;
     21 
     22 /**
     23  * A {@link ViewOutlineProvider} that animates a reveal in a "pill" shape.
     24  * A pill is simply a round rect, but we assume the width is greater than
     25  * the height and that the radius is equal to half the height.
     26  */
     27 public class PillRevealOutlineProvider extends RevealOutlineAnimation {
     28 
     29     private int mCenterX;
     30     private int mCenterY;
     31     private float mFinalRadius;
     32     protected Rect mPillRect;
     33 
     34     /**
     35      * @param x reveal center x
     36      * @param y reveal center y
     37      * @param pillRect round rect that represents the final pill shape
     38      */
     39     public PillRevealOutlineProvider(int x, int y, Rect pillRect) {
     40         this(x, y, pillRect, pillRect.height() / 2f);
     41     }
     42 
     43     public PillRevealOutlineProvider(int x, int y, Rect pillRect, float radius) {
     44         mCenterX = x;
     45         mCenterY = y;
     46         mPillRect = pillRect;
     47         mOutlineRadius = mFinalRadius = radius;
     48     }
     49 
     50     @Override
     51     public boolean shouldRemoveElevationDuringAnimation() {
     52         return false;
     53     }
     54 
     55     @Override
     56     public void setProgress(float progress) {
     57         // Assumes width is greater than height.
     58         int centerToEdge = Math.max(mCenterX, mPillRect.width() - mCenterX);
     59         int currentSize = (int) (progress * centerToEdge);
     60 
     61         // Bound the outline to the final pill shape defined by mPillRect.
     62         mOutline.left = Math.max(mPillRect.left, mCenterX - currentSize);
     63         mOutline.top = Math.max(mPillRect.top, mCenterY - currentSize);
     64         mOutline.right = Math.min(mPillRect.right, mCenterX + currentSize);
     65         mOutline.bottom = Math.min(mPillRect.bottom, mCenterY + currentSize);
     66         mOutlineRadius = Math.min(mFinalRadius, mOutline.height() / 2);
     67     }
     68 }
     69