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 int sNormalZ = Integer.MIN_VALUE;
29    static int sFocusedZ;
30    static final ViewOutlineProvider sOutlineProvider = new ViewOutlineProvider() {
31        @Override
32        public void getOutline(View view, Outline outline) {
33            outline.setRect(0, 0, view.getWidth(), view.getHeight());
34            outline.setAlpha(1.0f);
35        }
36    };
37
38    private static void initializeResources(Resources res) {
39        if (sNormalZ == Integer.MIN_VALUE) {
40            sNormalZ = (int) res.getDimension(R.dimen.lb_material_shadow_normal_z);
41            sFocusedZ = (int) res.getDimension(R.dimen.lb_material_shadow_focused_z);
42        }
43    }
44
45    /* add shadows and return a implementation detail object */
46    public static Object addShadow(ViewGroup shadowContainer, boolean roundedCorners) {
47        initializeResources(shadowContainer.getResources());
48        if (roundedCorners) {
49            RoundedRectHelperApi21.setRoundedRectBackground(shadowContainer,
50                    Color.TRANSPARENT);
51        } else {
52            shadowContainer.setOutlineProvider(sOutlineProvider);
53        }
54        shadowContainer.setZ(sNormalZ);
55        shadowContainer.setTransitionGroup(true);
56        return shadowContainer;
57    }
58
59    /* set shadow focus level 0 for unfocused 1 for fully focused */
60    public static void setShadowFocusLevel(Object impl, float level) {
61        ViewGroup shadowContainer = (ViewGroup) impl;
62        shadowContainer.setZ(sNormalZ + level * (sFocusedZ - sNormalZ));
63    }
64
65    public static void setZ(View view, float z) {
66        view.setZ(z);
67    }
68}
69