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