ShadowHelperApi21.java revision f4acd3cf076435ce836a6d4a9027b73ec3050def 
1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
5 * in compliance with the License. You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software distributed under the License
10 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
11 * or implied. See the License for the specific language governing permissions and limitations under
12 * the License.
13 */
14package android.support.v17.leanback.widget;
15
16import android.support.v17.leanback.R;
17import android.content.res.Resources;
18import android.graphics.Color;
19import android.graphics.Outline;
20import android.graphics.drawable.ColorDrawable;
21import android.graphics.drawable.Drawable;
22import android.view.ViewGroup;
23import android.view.View;
24import android.view.ViewOutlineProvider;
25
26class ShadowHelperApi21 {
27
28    static class ShadowImpl {
29        ViewGroup mShadowContainer;
30        float mNormalZ;
31        float mFocusedZ;
32    }
33
34    static final ViewOutlineProvider sOutlineProvider = new ViewOutlineProvider() {
35        @Override
36        public void getOutline(View view, Outline outline) {
37            outline.setRect(0, 0, view.getWidth(), view.getHeight());
38            outline.setAlpha(1.0f);
39        }
40    };
41
42    /* add shadows and return a implementation detail object */
43    public static Object addDynamicShadow(
44            ViewGroup shadowContainer, float unfocusedZ, float focusedZ, boolean roundedCorners) {
45        if (roundedCorners) {
46            RoundedRectHelperApi21.setRoundedRectBackground(shadowContainer,
47                    Color.TRANSPARENT);
48        } else {
49            shadowContainer.setOutlineProvider(sOutlineProvider);
50        }
51        ShadowImpl impl = new ShadowImpl();
52        impl.mShadowContainer = shadowContainer;
53        impl.mNormalZ = unfocusedZ;
54        impl.mFocusedZ = focusedZ;
55        shadowContainer.setZ(impl.mNormalZ);
56        shadowContainer.setTransitionGroup(true);
57        return impl;
58    }
59
60    /* set shadow focus level 0 for unfocused 1 for fully focused */
61    public static void setShadowFocusLevel(Object object, float level) {
62        ShadowImpl impl = (ShadowImpl) object;
63        impl.mShadowContainer.setZ(impl.mNormalZ + level * (impl.mFocusedZ - impl.mNormalZ));
64    }
65
66    public static void setZ(View view, float z) {
67        view.setZ(z);
68    }
69}
70