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
17package com.android.server.wm.animation;
18
19import android.graphics.Rect;
20import android.view.animation.ClipRectAnimation;
21import android.view.animation.Transformation;
22
23/**
24 * Special case of ClipRectAnimation that animates only the left/right
25 * dimensions of the clip, picking up the other dimensions from whatever is
26 * set on the transform already.
27 *
28 * @hide
29 */
30public class ClipRectLRAnimation extends ClipRectAnimation {
31
32    /**
33     * Constructor. Passes in 0 for Top/Bottom parameters of ClipRectAnimation
34     */
35    public ClipRectLRAnimation(int fromL, int fromR, int toL, int toR) {
36        super(fromL, 0, fromR, 0, toL, 0, toR, 0);
37    }
38
39    /**
40     * Calculates and sets clip rect on given transformation. It uses existing values
41     * on the Transformation for Top/Bottom clip parameters.
42     */
43    @Override
44    protected void applyTransformation(float it, Transformation tr) {
45        Rect oldClipRect = tr.getClipRect();
46        tr.setClipRect(mFromRect.left + (int) ((mToRect.left - mFromRect.left) * it),
47                oldClipRect.top,
48                mFromRect.right + (int) ((mToRect.right - mFromRect.right) * it),
49                oldClipRect.bottom);
50    }
51}
52