1 /* 2 * Copyright (C) 2010 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.widget; 18 19 import android.app.ActionBar; 20 import android.content.Context; 21 import android.content.res.TypedArray; 22 import android.graphics.Canvas; 23 import android.graphics.drawable.Drawable; 24 import android.util.AttributeSet; 25 import android.view.ActionMode; 26 import android.view.MotionEvent; 27 import android.view.View; 28 import android.view.ViewGroup; 29 import android.widget.FrameLayout; 30 31 /** 32 * This class acts as a container for the action bar view and action mode context views. 33 * It applies special styles as needed to help handle animated transitions between them. 34 * @hide 35 */ 36 public class ActionBarContainer extends FrameLayout { 37 private boolean mIsTransitioning; 38 private View mTabContainer; 39 private ActionBarView mActionBarView; 40 41 private Drawable mBackground; 42 private Drawable mStackedBackground; 43 private Drawable mSplitBackground; 44 private boolean mIsSplit; 45 private boolean mIsStacked; 46 47 public ActionBarContainer(Context context) { 48 this(context, null); 49 } 50 51 public ActionBarContainer(Context context, AttributeSet attrs) { 52 super(context, attrs); 53 54 setBackgroundDrawable(null); 55 56 TypedArray a = context.obtainStyledAttributes(attrs, 57 com.android.internal.R.styleable.ActionBar); 58 mBackground = a.getDrawable(com.android.internal.R.styleable.ActionBar_background); 59 mStackedBackground = a.getDrawable( 60 com.android.internal.R.styleable.ActionBar_backgroundStacked); 61 62 if (getId() == com.android.internal.R.id.split_action_bar) { 63 mIsSplit = true; 64 mSplitBackground = a.getDrawable( 65 com.android.internal.R.styleable.ActionBar_backgroundSplit); 66 } 67 a.recycle(); 68 69 setWillNotDraw(mIsSplit ? mSplitBackground == null : 70 mBackground == null && mStackedBackground == null); 71 } 72 73 @Override 74 public void onFinishInflate() { 75 super.onFinishInflate(); 76 mActionBarView = (ActionBarView) findViewById(com.android.internal.R.id.action_bar); 77 } 78 79 public void setPrimaryBackground(Drawable bg) { 80 mBackground = bg; 81 invalidate(); 82 } 83 84 public void setStackedBackground(Drawable bg) { 85 mStackedBackground = bg; 86 invalidate(); 87 } 88 89 public void setSplitBackground(Drawable bg) { 90 mSplitBackground = bg; 91 invalidate(); 92 } 93 94 /** 95 * Set the action bar into a "transitioning" state. While transitioning 96 * the bar will block focus and touch from all of its descendants. This 97 * prevents the user from interacting with the bar while it is animating 98 * in or out. 99 * 100 * @param isTransitioning true if the bar is currently transitioning, false otherwise. 101 */ 102 public void setTransitioning(boolean isTransitioning) { 103 mIsTransitioning = isTransitioning; 104 setDescendantFocusability(isTransitioning ? FOCUS_BLOCK_DESCENDANTS 105 : FOCUS_AFTER_DESCENDANTS); 106 } 107 108 @Override 109 public boolean onInterceptTouchEvent(MotionEvent ev) { 110 return mIsTransitioning || super.onInterceptTouchEvent(ev); 111 } 112 113 @Override 114 public boolean onTouchEvent(MotionEvent ev) { 115 super.onTouchEvent(ev); 116 117 // An action bar always eats touch events. 118 return true; 119 } 120 121 @Override 122 public boolean onHoverEvent(MotionEvent ev) { 123 super.onHoverEvent(ev); 124 125 // An action bar always eats hover events. 126 return true; 127 } 128 129 public void setTabContainer(ScrollingTabContainerView tabView) { 130 if (mTabContainer != null) { 131 removeView(mTabContainer); 132 } 133 mTabContainer = tabView; 134 if (tabView != null) { 135 addView(tabView); 136 final ViewGroup.LayoutParams lp = tabView.getLayoutParams(); 137 lp.width = LayoutParams.MATCH_PARENT; 138 lp.height = LayoutParams.WRAP_CONTENT; 139 tabView.setAllowCollapse(false); 140 } 141 } 142 143 public View getTabContainer() { 144 return mTabContainer; 145 } 146 147 @Override 148 public void onDraw(Canvas canvas) { 149 if (getWidth() == 0 || getHeight() == 0) { 150 return; 151 } 152 153 if (mIsSplit) { 154 if (mSplitBackground != null) mSplitBackground.draw(canvas); 155 } else { 156 if (mBackground != null) { 157 mBackground.draw(canvas); 158 } 159 if (mStackedBackground != null && mIsStacked) { 160 mStackedBackground.draw(canvas); 161 } 162 } 163 } 164 165 @Override 166 public ActionMode startActionModeForChild(View child, ActionMode.Callback callback) { 167 // No starting an action mode for an action bar child! (Where would it go?) 168 return null; 169 } 170 171 @Override 172 public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 173 super.onMeasure(widthMeasureSpec, heightMeasureSpec); 174 175 if (mActionBarView == null) return; 176 177 final LayoutParams lp = (LayoutParams) mActionBarView.getLayoutParams(); 178 final int actionBarViewHeight = mActionBarView.isCollapsed() ? 0 : 179 mActionBarView.getMeasuredHeight() + lp.topMargin + lp.bottomMargin; 180 181 if (mTabContainer != null && mTabContainer.getVisibility() != GONE) { 182 final int mode = MeasureSpec.getMode(heightMeasureSpec); 183 if (mode == MeasureSpec.AT_MOST) { 184 final int maxHeight = MeasureSpec.getSize(heightMeasureSpec); 185 setMeasuredDimension(getMeasuredWidth(), 186 Math.min(actionBarViewHeight + mTabContainer.getMeasuredHeight(), 187 maxHeight)); 188 } 189 } 190 } 191 192 @Override 193 public void onLayout(boolean changed, int l, int t, int r, int b) { 194 super.onLayout(changed, l, t, r, b); 195 196 final boolean hasTabs = mTabContainer != null && mTabContainer.getVisibility() != GONE; 197 198 if (mTabContainer != null && mTabContainer.getVisibility() != GONE) { 199 final int containerHeight = getMeasuredHeight(); 200 final int tabHeight = mTabContainer.getMeasuredHeight(); 201 202 if ((mActionBarView.getDisplayOptions() & ActionBar.DISPLAY_SHOW_HOME) == 0) { 203 // Not showing home, put tabs on top. 204 final int count = getChildCount(); 205 for (int i = 0; i < count; i++) { 206 final View child = getChildAt(i); 207 208 if (child == mTabContainer) continue; 209 210 if (!mActionBarView.isCollapsed()) { 211 child.offsetTopAndBottom(tabHeight); 212 } 213 } 214 mTabContainer.layout(l, 0, r, tabHeight); 215 } else { 216 mTabContainer.layout(l, containerHeight - tabHeight, r, containerHeight); 217 } 218 } 219 220 boolean needsInvalidate = false; 221 if (mIsSplit) { 222 if (mSplitBackground != null) { 223 mSplitBackground.setBounds(0, 0, getMeasuredWidth(), getMeasuredHeight()); 224 needsInvalidate = true; 225 } 226 } else { 227 if (mBackground != null) { 228 mBackground.setBounds(mActionBarView.getLeft(), mActionBarView.getTop(), 229 mActionBarView.getRight(), mActionBarView.getBottom()); 230 needsInvalidate = true; 231 } 232 if ((mIsStacked = hasTabs && mStackedBackground != null)) { 233 mStackedBackground.setBounds(mTabContainer.getLeft(), mTabContainer.getTop(), 234 mTabContainer.getRight(), mTabContainer.getBottom()); 235 needsInvalidate = true; 236 } 237 } 238 239 if (needsInvalidate) { 240 invalidate(); 241 } 242 } 243 } 244
