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      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 
     17 package com.android.internal.view;
     18 
     19 import com.android.internal.R;
     20 
     21 import android.content.Context;
     22 import android.content.res.Resources;
     23 import android.content.res.TypedArray;
     24 import android.os.Build;
     25 import android.view.ViewConfiguration;
     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  */
     31 public 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     public int getMaxActionButtons() {
     43         return mContext.getResources().getInteger(R.integer.max_action_buttons);
     44     }
     45 
     46     public boolean showsOverflowMenuButton() {
     47         return !ViewConfiguration.get(mContext).hasPermanentMenuKey();
     48     }
     49 
     50     public int getEmbeddedMenuWidthLimit() {
     51         return mContext.getResources().getDisplayMetrics().widthPixels / 2;
     52     }
     53 
     54     public boolean hasEmbeddedTabs() {
     55         final int targetSdk = mContext.getApplicationInfo().targetSdkVersion;
     56         if (targetSdk >= Build.VERSION_CODES.JELLY_BEAN) {
     57             return mContext.getResources().getBoolean(R.bool.action_bar_embed_tabs);
     58         }
     59 
     60         // The embedded tabs policy changed in Jellybean; give older apps the old policy
     61         // so they get what they expect.
     62         return mContext.getResources().getBoolean(R.bool.action_bar_embed_tabs_pre_jb);
     63     }
     64 
     65     public int getTabContainerHeight() {
     66         TypedArray a = mContext.obtainStyledAttributes(null, R.styleable.ActionBar,
     67                 com.android.internal.R.attr.actionBarStyle, 0);
     68         int height = a.getLayoutDimension(R.styleable.ActionBar_height, 0);
     69         Resources r = mContext.getResources();
     70         if (!hasEmbeddedTabs()) {
     71             // Stacked tabs; limit the height
     72             height = Math.min(height,
     73                     r.getDimensionPixelSize(R.dimen.action_bar_stacked_max_height));
     74         }
     75         a.recycle();
     76         return height;
     77     }
     78 
     79     public boolean enableHomeButtonByDefault() {
     80         // Older apps get the home button interaction enabled by default.
     81         // Newer apps need to enable it explicitly.
     82         return mContext.getApplicationInfo().targetSdkVersion <
     83                 Build.VERSION_CODES.ICE_CREAM_SANDWICH;
     84     }
     85 
     86     public int getStackedTabMaxWidth() {
     87         return mContext.getResources().getDimensionPixelSize(
     88                 R.dimen.action_bar_stacked_tab_max_width);
     89     }
     90 }
     91