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 17package com.android.internal.widget; 18 19import android.annotation.NonNull; 20import android.content.Context; 21import android.content.res.TypedArray; 22import android.graphics.Canvas; 23import android.graphics.ColorFilter; 24import android.graphics.Outline; 25import android.graphics.PixelFormat; 26import android.graphics.RectF; 27import android.graphics.drawable.Drawable; 28import android.util.AttributeSet; 29import android.view.ActionMode; 30import android.view.MotionEvent; 31import android.view.View; 32import android.view.ViewGroup; 33import android.widget.FrameLayout; 34 35import java.util.List; 36 37/** 38 * This class acts as a container for the action bar view and action mode context views. 39 * It applies special styles as needed to help handle animated transitions between them. 40 * @hide 41 */ 42public class ActionBarContainer extends FrameLayout { 43 private boolean mIsTransitioning; 44 private View mTabContainer; 45 private View mActionBarView; 46 private View mActionContextView; 47 48 private Drawable mBackground; 49 private Drawable mStackedBackground; 50 private Drawable mSplitBackground; 51 private boolean mIsSplit; 52 private boolean mIsStacked; 53 private int mHeight; 54 55 public ActionBarContainer(Context context) { 56 this(context, null); 57 } 58 59 public ActionBarContainer(Context context, AttributeSet attrs) { 60 super(context, attrs); 61 62 // Set a transparent background so that we project appropriately. 63 setBackground(new ActionBarBackgroundDrawable()); 64 65 TypedArray a = context.obtainStyledAttributes(attrs, 66 com.android.internal.R.styleable.ActionBar); 67 mBackground = a.getDrawable(com.android.internal.R.styleable.ActionBar_background); 68 mStackedBackground = a.getDrawable( 69 com.android.internal.R.styleable.ActionBar_backgroundStacked); 70 mHeight = a.getDimensionPixelSize(com.android.internal.R.styleable.ActionBar_height, -1); 71 72 if (getId() == com.android.internal.R.id.split_action_bar) { 73 mIsSplit = true; 74 mSplitBackground = a.getDrawable( 75 com.android.internal.R.styleable.ActionBar_backgroundSplit); 76 } 77 a.recycle(); 78 79 setWillNotDraw(mIsSplit ? mSplitBackground == null : 80 mBackground == null && mStackedBackground == null); 81 } 82 83 @Override 84 public void onFinishInflate() { 85 super.onFinishInflate(); 86 mActionBarView = findViewById(com.android.internal.R.id.action_bar); 87 mActionContextView = findViewById(com.android.internal.R.id.action_context_bar); 88 } 89 90 public void setPrimaryBackground(Drawable bg) { 91 if (mBackground != null) { 92 mBackground.setCallback(null); 93 unscheduleDrawable(mBackground); 94 } 95 mBackground = bg; 96 if (bg != null) { 97 bg.setCallback(this); 98 if (mActionBarView != null) { 99 mBackground.setBounds(mActionBarView.getLeft(), mActionBarView.getTop(), 100 mActionBarView.getRight(), mActionBarView.getBottom()); 101 } 102 } 103 setWillNotDraw(mIsSplit ? mSplitBackground == null : 104 mBackground == null && mStackedBackground == null); 105 invalidate(); 106 } 107 108 public void setStackedBackground(Drawable bg) { 109 if (mStackedBackground != null) { 110 mStackedBackground.setCallback(null); 111 unscheduleDrawable(mStackedBackground); 112 } 113 mStackedBackground = bg; 114 if (bg != null) { 115 bg.setCallback(this); 116 if ((mIsStacked && mStackedBackground != null)) { 117 mStackedBackground.setBounds(mTabContainer.getLeft(), mTabContainer.getTop(), 118 mTabContainer.getRight(), mTabContainer.getBottom()); 119 } 120 } 121 setWillNotDraw(mIsSplit ? mSplitBackground == null : 122 mBackground == null && mStackedBackground == null); 123 invalidate(); 124 } 125 126 public void setSplitBackground(Drawable bg) { 127 if (mSplitBackground != null) { 128 mSplitBackground.setCallback(null); 129 unscheduleDrawable(mSplitBackground); 130 } 131 mSplitBackground = bg; 132 if (bg != null) { 133 bg.setCallback(this); 134 if (mIsSplit && mSplitBackground != null) { 135 mSplitBackground.setBounds(0, 0, getMeasuredWidth(), getMeasuredHeight()); 136 } 137 } 138 setWillNotDraw(mIsSplit ? mSplitBackground == null : 139 mBackground == null && mStackedBackground == null); 140 invalidate(); 141 } 142 143 @Override 144 public void setVisibility(int visibility) { 145 super.setVisibility(visibility); 146 final boolean isVisible = visibility == VISIBLE; 147 if (mBackground != null) mBackground.setVisible(isVisible, false); 148 if (mStackedBackground != null) mStackedBackground.setVisible(isVisible, false); 149 if (mSplitBackground != null) mSplitBackground.setVisible(isVisible, false); 150 } 151 152 @Override 153 protected boolean verifyDrawable(Drawable who) { 154 return (who == mBackground && !mIsSplit) || (who == mStackedBackground && mIsStacked) || 155 (who == mSplitBackground && mIsSplit) || super.verifyDrawable(who); 156 } 157 158 @Override 159 protected void drawableStateChanged() { 160 super.drawableStateChanged(); 161 if (mBackground != null && mBackground.isStateful()) { 162 mBackground.setState(getDrawableState()); 163 } 164 if (mStackedBackground != null && mStackedBackground.isStateful()) { 165 mStackedBackground.setState(getDrawableState()); 166 } 167 if (mSplitBackground != null && mSplitBackground.isStateful()) { 168 mSplitBackground.setState(getDrawableState()); 169 } 170 } 171 172 @Override 173 public void jumpDrawablesToCurrentState() { 174 super.jumpDrawablesToCurrentState(); 175 if (mBackground != null) { 176 mBackground.jumpToCurrentState(); 177 } 178 if (mStackedBackground != null) { 179 mStackedBackground.jumpToCurrentState(); 180 } 181 if (mSplitBackground != null) { 182 mSplitBackground.jumpToCurrentState(); 183 } 184 } 185 186 /** 187 * @hide 188 */ 189 @Override 190 public void onResolveDrawables(int layoutDirection) { 191 super.onResolveDrawables(layoutDirection); 192 if (mBackground != null) { 193 mBackground.setLayoutDirection(layoutDirection); 194 } 195 if (mStackedBackground != null) { 196 mStackedBackground.setLayoutDirection(layoutDirection); 197 } 198 if (mSplitBackground != null) { 199 mSplitBackground.setLayoutDirection(layoutDirection); 200 } 201 } 202 203 /** 204 * Set the action bar into a "transitioning" state. While transitioning 205 * the bar will block focus and touch from all of its descendants. This 206 * prevents the user from interacting with the bar while it is animating 207 * in or out. 208 * 209 * @param isTransitioning true if the bar is currently transitioning, false otherwise. 210 */ 211 public void setTransitioning(boolean isTransitioning) { 212 mIsTransitioning = isTransitioning; 213 setDescendantFocusability(isTransitioning ? FOCUS_BLOCK_DESCENDANTS 214 : FOCUS_AFTER_DESCENDANTS); 215 } 216 217 @Override 218 public boolean onInterceptTouchEvent(MotionEvent ev) { 219 return mIsTransitioning || super.onInterceptTouchEvent(ev); 220 } 221 222 @Override 223 public boolean onTouchEvent(MotionEvent ev) { 224 super.onTouchEvent(ev); 225 226 // An action bar always eats touch events. 227 return true; 228 } 229 230 @Override 231 public boolean onHoverEvent(MotionEvent ev) { 232 super.onHoverEvent(ev); 233 234 // An action bar always eats hover events. 235 return true; 236 } 237 238 public void setTabContainer(ScrollingTabContainerView tabView) { 239 if (mTabContainer != null) { 240 removeView(mTabContainer); 241 } 242 mTabContainer = tabView; 243 if (tabView != null) { 244 addView(tabView); 245 final ViewGroup.LayoutParams lp = tabView.getLayoutParams(); 246 lp.width = LayoutParams.MATCH_PARENT; 247 lp.height = LayoutParams.WRAP_CONTENT; 248 tabView.setAllowCollapse(false); 249 } 250 } 251 252 public View getTabContainer() { 253 return mTabContainer; 254 } 255 256 @Override 257 public ActionMode startActionModeForChild(View child, ActionMode.Callback callback) { 258 // No starting an action mode for an action bar child! (Where would it go?) 259 return null; 260 } 261 262 private static boolean isCollapsed(View view) { 263 return view == null || view.getVisibility() == GONE || view.getMeasuredHeight() == 0; 264 } 265 266 private int getMeasuredHeightWithMargins(View view) { 267 final LayoutParams lp = (LayoutParams) view.getLayoutParams(); 268 return view.getMeasuredHeight() + lp.topMargin + lp.bottomMargin; 269 } 270 271 @Override 272 public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 273 if (mActionBarView == null && 274 MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.AT_MOST && mHeight >= 0) { 275 heightMeasureSpec = MeasureSpec.makeMeasureSpec( 276 Math.min(mHeight, MeasureSpec.getSize(heightMeasureSpec)), MeasureSpec.AT_MOST); 277 } 278 super.onMeasure(widthMeasureSpec, heightMeasureSpec); 279 280 if (mActionBarView == null) return; 281 282 if (mTabContainer != null && mTabContainer.getVisibility() != GONE) { 283 int nonTabMaxHeight = 0; 284 final int childCount = getChildCount(); 285 for (int i = 0; i < childCount; i++) { 286 final View child = getChildAt(i); 287 if (child == mTabContainer) { 288 continue; 289 } 290 nonTabMaxHeight = Math.max(nonTabMaxHeight, isCollapsed(child) ? 0 : 291 getMeasuredHeightWithMargins(child)); 292 } 293 final int mode = MeasureSpec.getMode(heightMeasureSpec); 294 final int maxHeight = mode == MeasureSpec.AT_MOST ? 295 MeasureSpec.getSize(heightMeasureSpec) : Integer.MAX_VALUE; 296 setMeasuredDimension(getMeasuredWidth(), 297 Math.min(nonTabMaxHeight + getMeasuredHeightWithMargins(mTabContainer), 298 maxHeight)); 299 } 300 } 301 302 @Override 303 public void onLayout(boolean changed, int l, int t, int r, int b) { 304 super.onLayout(changed, l, t, r, b); 305 306 final View tabContainer = mTabContainer; 307 final boolean hasTabs = tabContainer != null && tabContainer.getVisibility() != GONE; 308 309 if (tabContainer != null && tabContainer.getVisibility() != GONE) { 310 final int containerHeight = getMeasuredHeight(); 311 final LayoutParams lp = (LayoutParams) tabContainer.getLayoutParams(); 312 final int tabHeight = tabContainer.getMeasuredHeight(); 313 tabContainer.layout(l, containerHeight - tabHeight - lp.bottomMargin, r, 314 containerHeight - lp.bottomMargin); 315 } 316 317 boolean needsInvalidate = false; 318 if (mIsSplit) { 319 if (mSplitBackground != null) { 320 mSplitBackground.setBounds(0, 0, getMeasuredWidth(), getMeasuredHeight()); 321 needsInvalidate = true; 322 } 323 } else { 324 if (mBackground != null) { 325 if (mActionBarView.getVisibility() == View.VISIBLE) { 326 mBackground.setBounds(mActionBarView.getLeft(), mActionBarView.getTop(), 327 mActionBarView.getRight(), mActionBarView.getBottom()); 328 } else if (mActionContextView != null && 329 mActionContextView.getVisibility() == View.VISIBLE) { 330 mBackground.setBounds(mActionContextView.getLeft(), mActionContextView.getTop(), 331 mActionContextView.getRight(), mActionContextView.getBottom()); 332 } else { 333 mBackground.setBounds(0, 0, 0, 0); 334 } 335 needsInvalidate = true; 336 } 337 mIsStacked = hasTabs; 338 if (hasTabs && mStackedBackground != null) { 339 mStackedBackground.setBounds(tabContainer.getLeft(), tabContainer.getTop(), 340 tabContainer.getRight(), tabContainer.getBottom()); 341 needsInvalidate = true; 342 } 343 } 344 345 if (needsInvalidate) { 346 invalidate(); 347 } 348 } 349 350 /** 351 * Dummy drawable so that we don't break background display lists and 352 * projection surfaces. 353 */ 354 private class ActionBarBackgroundDrawable extends Drawable { 355 @Override 356 public void draw(Canvas canvas) { 357 if (mIsSplit) { 358 if (mSplitBackground != null) { 359 mSplitBackground.draw(canvas); 360 } 361 } else { 362 if (mBackground != null) { 363 mBackground.draw(canvas); 364 } 365 if (mStackedBackground != null && mIsStacked) { 366 mStackedBackground.draw(canvas); 367 } 368 } 369 } 370 371 @Override 372 public void getOutline(@NonNull Outline outline) { 373 if (mIsSplit) { 374 if (mSplitBackground != null) { 375 mSplitBackground.getOutline(outline); 376 } 377 } else { 378 // ignore the stacked background for shadow casting 379 if (mBackground != null) { 380 mBackground.getOutline(outline); 381 } 382 } 383 } 384 385 @Override 386 public void setAlpha(int alpha) { 387 } 388 389 @Override 390 public void setColorFilter(ColorFilter cf) { 391 } 392 393 @Override 394 public int getOpacity() { 395 if (mIsSplit) { 396 if (mSplitBackground != null 397 && mSplitBackground.getOpacity() == PixelFormat.OPAQUE) { 398 return PixelFormat.OPAQUE; 399 } 400 } else { 401 if (mIsStacked && (mStackedBackground == null 402 || mStackedBackground.getOpacity() != PixelFormat.OPAQUE)) { 403 return PixelFormat.UNKNOWN; 404 } 405 if (!isCollapsed(mActionBarView) && mBackground != null 406 && mBackground.getOpacity() == PixelFormat.OPAQUE) { 407 return PixelFormat.OPAQUE; 408 } 409 } 410 411 return PixelFormat.UNKNOWN; 412 } 413 } 414} 415