1/*
2 * Copyright (C) 2015 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 android.view.animation;
18
19import android.graphics.Rect;
20
21/**
22 * Special case of ClipRectAnimation that animates only the top/bottom
23 * dimensions of the clip, picking up the other dimensions from whatever is
24 * set on the transform already.
25 *
26 * @hide
27 */
28public class ClipRectTBAnimation extends ClipRectAnimation {
29
30    /**
31     * Constructor. Passes in 0 for Left/Right parameters of ClipRectAnimation
32     */
33    public ClipRectTBAnimation(int fromT, int fromB, int toT, int toB) {
34        super(0, fromT, 0, fromB, 0, toT, 0, toB);
35    }
36
37    /**
38     * Calculates and sets clip rect on given transformation. It uses existing values
39     * on the Transformation for Left/Right clip parameters.
40     */
41    @Override
42    protected void applyTransformation(float it, Transformation tr) {
43        Rect oldClipRect = tr.getClipRect();
44        tr.setClipRect(oldClipRect.left, mFromRect.top + (int) ((mToRect.top - mFromRect.top) * it),
45                oldClipRect.right,
46                mFromRect.bottom + (int) ((mToRect.bottom - mFromRect.bottom) * it));
47    }
48
49}
50