ActionBarPolicy.java revision a2c72b87007d10202c25e78e904938f770c6337d 
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.internal.view;
18
19import android.content.Context;
20import android.content.res.Configuration;
21import android.content.res.Resources;
22import android.content.res.TypedArray;
23import android.os.Build;
24import android.support.v4.view.ViewConfigurationCompat;
25import android.support.v7.appcompat.R;
26import android.view.ViewConfiguration;
27
28/**
29 * Allows components to query for various configuration policy decisions about how the action bar
30 * should lay out and behave on the current device.
31 *
32 * @hide
33 */
34public class ActionBarPolicy {
35
36    private Context mContext;
37
38    public static ActionBarPolicy get(Context context) {
39        return new ActionBarPolicy(context);
40    }
41
42    private ActionBarPolicy(Context context) {
43        mContext = context;
44    }
45
46    public int getMaxActionButtons() {
47        return mContext.getResources().getInteger(R.integer.abc_max_action_buttons);
48    }
49
50    public boolean showsOverflowMenuButton() {
51        return true;
52    }
53
54    public int getEmbeddedMenuWidthLimit() {
55        return mContext.getResources().getDisplayMetrics().widthPixels / 2;
56    }
57
58    public boolean hasEmbeddedTabs() {
59        final int targetSdk = mContext.getApplicationInfo().targetSdkVersion;
60        if (targetSdk >= Build.VERSION_CODES.JELLY_BEAN) {
61            return mContext.getResources().getBoolean(R.bool.abc_action_bar_embed_tabs);
62        }
63
64        // The embedded tabs policy changed in Jellybean; give older apps the old policy
65        // so they get what they expect.
66        return mContext.getResources().getBoolean(R.bool.abc_action_bar_embed_tabs_pre_jb);
67    }
68
69    public int getTabContainerHeight() {
70        TypedArray a = mContext.obtainStyledAttributes(null, R.styleable.ActionBar,
71                R.attr.actionBarStyle, 0);
72        int height = a.getLayoutDimension(R.styleable.ActionBar_height, 0);
73        Resources r = mContext.getResources();
74        if (!hasEmbeddedTabs()) {
75            // Stacked tabs; limit the height
76            height = Math.min(height,
77                    r.getDimensionPixelSize(R.dimen.abc_action_bar_stacked_max_height));
78        }
79        a.recycle();
80        return height;
81    }
82
83    public boolean enableHomeButtonByDefault() {
84        // Older apps get the home button interaction enabled by default.
85        // Newer apps need to enable it explicitly.
86        return mContext.getApplicationInfo().targetSdkVersion <
87                Build.VERSION_CODES.ICE_CREAM_SANDWICH;
88    }
89
90    public int getStackedTabMaxWidth() {
91        return mContext.getResources().getDimensionPixelSize(
92                R.dimen.abc_action_bar_stacked_tab_max_width);
93    }
94}
95