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