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.Resources; 21import android.content.res.TypedArray; 22import android.os.Build; 23import android.support.v4.view.ViewConfigurationCompat; 24import android.support.v7.appcompat.R; 25import android.view.ViewConfiguration; 26 27/** 28 * Allows components to query for various configuration policy decisions about how the action bar 29 * should lay out and behave on the current device. 30 * 31 * @hide 32 */ 33public class ActionBarPolicy { 34 35 private Context mContext; 36 37 public static ActionBarPolicy get(Context context) { 38 return new ActionBarPolicy(context); 39 } 40 41 private ActionBarPolicy(Context context) { 42 mContext = context; 43 } 44 45 public int getMaxActionButtons() { 46 return mContext.getResources().getInteger(R.integer.abc_max_action_buttons); 47 } 48 49 public boolean showsOverflowMenuButton() { 50 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) { 51 return true; 52 } else { 53 return !ViewConfigurationCompat.hasPermanentMenuKey(ViewConfiguration.get(mContext)); 54 } 55 } 56 57 public int getEmbeddedMenuWidthLimit() { 58 return mContext.getResources().getDisplayMetrics().widthPixels / 2; 59 } 60 61 public boolean hasEmbeddedTabs() { 62 final int targetSdk = mContext.getApplicationInfo().targetSdkVersion; 63 if (targetSdk >= Build.VERSION_CODES.JELLY_BEAN) { 64 return mContext.getResources().getBoolean(R.bool.abc_action_bar_embed_tabs); 65 } 66 67 // The embedded tabs policy changed in Jellybean; give older apps the old policy 68 // so they get what they expect. 69 return mContext.getResources().getBoolean(R.bool.abc_action_bar_embed_tabs_pre_jb); 70 } 71 72 public int getTabContainerHeight() { 73 TypedArray a = mContext.obtainStyledAttributes(null, R.styleable.ActionBar, 74 R.attr.actionBarStyle, 0); 75 int height = a.getLayoutDimension(R.styleable.ActionBar_height, 0); 76 Resources r = mContext.getResources(); 77 if (!hasEmbeddedTabs()) { 78 // Stacked tabs; limit the height 79 height = Math.min(height, 80 r.getDimensionPixelSize(R.dimen.abc_action_bar_stacked_max_height)); 81 } 82 a.recycle(); 83 return height; 84 } 85 86 public boolean enableHomeButtonByDefault() { 87 // Older apps get the home button interaction enabled by default. 88 // Newer apps need to enable it explicitly. 89 return mContext.getApplicationInfo().targetSdkVersion < 90 Build.VERSION_CODES.ICE_CREAM_SANDWICH; 91 } 92 93 public int getStackedTabMaxWidth() { 94 return mContext.getResources().getDimensionPixelSize( 95 R.dimen.abc_action_bar_stacked_tab_max_width); 96 } 97} 98