1/*
2 * Copyright (C) 2012 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.support.v7.view;
18
19import static android.support.annotation.RestrictTo.Scope.LIBRARY_GROUP;
20
21import android.content.Context;
22import android.content.res.Configuration;
23import android.content.res.Resources;
24import android.content.res.TypedArray;
25import android.os.Build;
26import android.support.annotation.RestrictTo;
27import android.support.v7.appcompat.R;
28import android.view.ViewConfiguration;
29
30/**
31 * Allows components to query for various configuration policy decisions about how the action bar
32 * should lay out and behave on the current device.
33 *
34 * @hide
35 */
36@RestrictTo(LIBRARY_GROUP)
37public class ActionBarPolicy {
38
39    private Context mContext;
40
41    public static ActionBarPolicy get(Context context) {
42        return new ActionBarPolicy(context);
43    }
44
45    private ActionBarPolicy(Context context) {
46        mContext = context;
47    }
48
49    /**
50     * Returns the maximum number of action buttons that should be permitted within an action
51     * bar/action mode. This will be used to determine how many showAsAction="ifRoom" items can fit.
52     * "always" items can override this.
53     */
54    public int getMaxActionButtons() {
55        final Configuration configuration = mContext.getResources().getConfiguration();
56        final int widthDp = configuration.screenWidthDp;
57        final int heightDp = configuration.screenHeightDp;
58        final int smallest = configuration.smallestScreenWidthDp;
59
60        if (smallest > 600 || widthDp > 600 || (widthDp > 960 && heightDp > 720)
61                || (widthDp > 720 && heightDp > 960)) {
62            // For values-w600dp, values-sw600dp and values-xlarge.
63            return 5;
64        } else if (widthDp >= 500 || (widthDp > 640 && heightDp > 480)
65                || (widthDp > 480 && heightDp > 640)) {
66            // For values-w500dp and values-large.
67            return 4;
68        } else if (widthDp >= 360) {
69            // For values-w360dp.
70            return 3;
71        } else {
72            return 2;
73        }
74    }
75
76    public boolean showsOverflowMenuButton() {
77        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
78            return true;
79        } else {
80            return !ViewConfiguration.get(mContext).hasPermanentMenuKey();
81        }
82    }
83
84    public int getEmbeddedMenuWidthLimit() {
85        return mContext.getResources().getDisplayMetrics().widthPixels / 2;
86    }
87
88    public boolean hasEmbeddedTabs() {
89        return mContext.getResources().getBoolean(R.bool.abc_action_bar_embed_tabs);
90    }
91
92    public int getTabContainerHeight() {
93        TypedArray a = mContext.obtainStyledAttributes(null, R.styleable.ActionBar,
94                R.attr.actionBarStyle, 0);
95        int height = a.getLayoutDimension(R.styleable.ActionBar_height, 0);
96        Resources r = mContext.getResources();
97        if (!hasEmbeddedTabs()) {
98            // Stacked tabs; limit the height
99            height = Math.min(height,
100                    r.getDimensionPixelSize(R.dimen.abc_action_bar_stacked_max_height));
101        }
102        a.recycle();
103        return height;
104    }
105
106    public boolean enableHomeButtonByDefault() {
107        // Older apps get the home button interaction enabled by default.
108        // Newer apps need to enable it explicitly.
109        return mContext.getApplicationInfo().targetSdkVersion <
110                Build.VERSION_CODES.ICE_CREAM_SANDWICH;
111    }
112
113    public int getStackedTabMaxWidth() {
114        return mContext.getResources().getDimensionPixelSize(
115                R.dimen.abc_action_bar_stacked_tab_max_width);
116    }
117}
118