ActionBarPolicy.java revision 6090995951c6e2e4dcf38102f01793f8a94166e1 
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.Resources;
23import android.content.res.TypedArray;
24import android.os.Build;
25
26/**
27 * Allows components to query for various configuration policy decisions
28 * about how the action bar should lay out and behave on the current device.
29 */
30public class ActionBarPolicy {
31    private Context mContext;
32
33    public static ActionBarPolicy get(Context context) {
34        return new ActionBarPolicy(context);
35    }
36
37    private ActionBarPolicy(Context context) {
38        mContext = context;
39    }
40
41    public int getMaxActionButtons() {
42        return mContext.getResources().getInteger(R.integer.max_action_buttons);
43    }
44
45    public boolean showsOverflowMenuButton() {
46        return true;
47    }
48
49    public int getEmbeddedMenuWidthLimit() {
50        return mContext.getResources().getDisplayMetrics().widthPixels / 2;
51    }
52
53    public boolean hasEmbeddedTabs() {
54        final int targetSdk = mContext.getApplicationInfo().targetSdkVersion;
55        if (targetSdk >= Build.VERSION_CODES.JELLY_BEAN) {
56            return mContext.getResources().getBoolean(R.bool.action_bar_embed_tabs);
57        }
58
59        // The embedded tabs policy changed in Jellybean; give older apps the old policy
60        // so they get what they expect.
61        return mContext.getResources().getBoolean(R.bool.action_bar_embed_tabs_pre_jb);
62    }
63
64    public int getTabContainerHeight() {
65        TypedArray a = mContext.obtainStyledAttributes(null, R.styleable.ActionBar,
66                com.android.internal.R.attr.actionBarStyle, 0);
67        int height = a.getLayoutDimension(R.styleable.ActionBar_height, 0);
68        Resources r = mContext.getResources();
69        if (!hasEmbeddedTabs()) {
70            // Stacked tabs; limit the height
71            height = Math.min(height,
72                    r.getDimensionPixelSize(R.dimen.action_bar_stacked_max_height));
73        }
74        a.recycle();
75        return height;
76    }
77
78    public boolean enableHomeButtonByDefault() {
79        // Older apps get the home button interaction enabled by default.
80        // Newer apps need to enable it explicitly.
81        return mContext.getApplicationInfo().targetSdkVersion <
82                Build.VERSION_CODES.ICE_CREAM_SANDWICH;
83    }
84
85    public int getStackedTabMaxWidth() {
86        return mContext.getResources().getDimensionPixelSize(
87                R.dimen.action_bar_stacked_tab_max_width);
88    }
89}
90