1 /* 2 * Copyright (C) 2014 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 android.view.animation; 18 19 import android.graphics.Rect; 20 21 /** 22 * An animation that controls the clip of an object. See the 23 * {@link android.view.animation full package} description for details and 24 * sample code. 25 * 26 * @hide 27 */ 28 public class ClipRectAnimation extends Animation { 29 private Rect mFromRect = new Rect(); 30 private Rect mToRect = new Rect(); 31 32 /** 33 * Constructor to use when building a ClipRectAnimation from code 34 * 35 * @param fromClip the clip rect to animate from 36 * @param toClip the clip rect to animate to 37 */ 38 public ClipRectAnimation(Rect fromClip, Rect toClip) { 39 if (fromClip == null || toClip == null) { 40 throw new RuntimeException("Expected non-null animation clip rects"); 41 } 42 mFromRect.set(fromClip); 43 mToRect.set(toClip); 44 } 45 46 @Override 47 protected void applyTransformation(float it, Transformation tr) { 48 int l = mFromRect.left + (int) ((mToRect.left - mFromRect.left) * it); 49 int t = mFromRect.top + (int) ((mToRect.top - mFromRect.top) * it); 50 int r = mFromRect.right + (int) ((mToRect.right - mFromRect.right) * it); 51 int b = mFromRect.bottom + (int) ((mToRect.bottom - mFromRect.bottom) * it); 52 tr.setClipRect(l, t, r, b); 53 } 54 55 @Override 56 public boolean willChangeTransformationMatrix() { 57 return false; 58 } 59 } 60
