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
18package android.support.v4.widget;
19
20import android.content.Context;
21import android.content.res.TypedArray;
22import android.graphics.drawable.Drawable;
23import android.support.annotation.RequiresApi;
24import android.view.Gravity;
25import android.view.View;
26import android.view.ViewGroup;
27import android.view.WindowInsets;
28
29/**
30 * Provides functionality for DrawerLayout unique to API 21
31 */
32@RequiresApi(21)
33class DrawerLayoutCompatApi21 {
34
35    private static final int[] THEME_ATTRS = {
36            android.R.attr.colorPrimaryDark
37    };
38
39    public static void configureApplyInsets(View drawerLayout) {
40        if (drawerLayout instanceof DrawerLayoutImpl) {
41            drawerLayout.setOnApplyWindowInsetsListener(new InsetsListener());
42            drawerLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE
43                    | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
44        }
45    }
46
47    public static void dispatchChildInsets(View child, Object insets, int gravity) {
48        WindowInsets wi = (WindowInsets) insets;
49        if (gravity == Gravity.LEFT) {
50            wi = wi.replaceSystemWindowInsets(wi.getSystemWindowInsetLeft(),
51                    wi.getSystemWindowInsetTop(), 0, wi.getSystemWindowInsetBottom());
52        } else if (gravity == Gravity.RIGHT) {
53            wi = wi.replaceSystemWindowInsets(0, wi.getSystemWindowInsetTop(),
54                    wi.getSystemWindowInsetRight(), wi.getSystemWindowInsetBottom());
55        }
56        child.dispatchApplyWindowInsets(wi);
57    }
58
59    public static void applyMarginInsets(ViewGroup.MarginLayoutParams lp, Object insets,
60            int gravity) {
61        WindowInsets wi = (WindowInsets) insets;
62        if (gravity == Gravity.LEFT) {
63            wi = wi.replaceSystemWindowInsets(wi.getSystemWindowInsetLeft(),
64                    wi.getSystemWindowInsetTop(), 0, wi.getSystemWindowInsetBottom());
65        } else if (gravity == Gravity.RIGHT) {
66            wi = wi.replaceSystemWindowInsets(0, wi.getSystemWindowInsetTop(),
67                    wi.getSystemWindowInsetRight(), wi.getSystemWindowInsetBottom());
68        }
69        lp.leftMargin = wi.getSystemWindowInsetLeft();
70        lp.topMargin = wi.getSystemWindowInsetTop();
71        lp.rightMargin = wi.getSystemWindowInsetRight();
72        lp.bottomMargin = wi.getSystemWindowInsetBottom();
73    }
74
75    public static int getTopInset(Object insets) {
76        return insets != null ? ((WindowInsets) insets).getSystemWindowInsetTop() : 0;
77    }
78
79    public static Drawable getDefaultStatusBarBackground(Context context) {
80        final TypedArray a = context.obtainStyledAttributes(THEME_ATTRS);
81        try {
82            return a.getDrawable(0);
83        } finally {
84            a.recycle();
85        }
86    }
87
88    static class InsetsListener implements View.OnApplyWindowInsetsListener {
89        @Override
90        public WindowInsets onApplyWindowInsets(View v, WindowInsets insets) {
91            final DrawerLayoutImpl drawerLayout = (DrawerLayoutImpl) v;
92            drawerLayout.setChildInsets(insets, insets.getSystemWindowInsetTop() > 0);
93            return insets.consumeSystemWindowInsets();
94        }
95    }
96}
97