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 get(Context context)34 public static ActionBarPolicy get(Context context) { 35 return new ActionBarPolicy(context); 36 } 37 ActionBarPolicy(Context context)38 private ActionBarPolicy(Context context) { 39 mContext = context; 40 } 41 getMaxActionButtons()42 public int getMaxActionButtons() { 43 return mContext.getResources().getInteger(R.integer.max_action_buttons); 44 } 45 showsOverflowMenuButton()46 public boolean showsOverflowMenuButton() { 47 return !ViewConfiguration.get(mContext).hasPermanentMenuKey(); 48 } 49 getEmbeddedMenuWidthLimit()50 public int getEmbeddedMenuWidthLimit() { 51 return mContext.getResources().getDisplayMetrics().widthPixels / 2; 52 } 53 hasEmbeddedTabs()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 getTabContainerHeight()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 enableHomeButtonByDefault()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 getStackedTabMaxWidth()86 public int getStackedTabMaxWidth() { 87 return mContext.getResources().getDimensionPixelSize( 88 R.dimen.action_bar_stacked_tab_max_width); 89 } 90 } 91