1/* 2 * Copyright (C) 2011 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 */ 16package com.android.internal.widget; 17 18import com.android.internal.view.ActionBarPolicy; 19 20import android.animation.Animator; 21import android.animation.ObjectAnimator; 22import android.animation.TimeInterpolator; 23import android.app.ActionBar; 24import android.content.Context; 25import android.content.res.Configuration; 26import android.graphics.Rect; 27import android.graphics.drawable.Drawable; 28import android.text.TextUtils; 29import android.text.TextUtils.TruncateAt; 30import android.view.Gravity; 31import android.view.View; 32import android.view.ViewGroup; 33import android.view.ViewParent; 34import android.view.accessibility.AccessibilityEvent; 35import android.view.accessibility.AccessibilityNodeInfo; 36import android.view.animation.DecelerateInterpolator; 37import android.widget.AdapterView; 38import android.widget.BaseAdapter; 39import android.widget.HorizontalScrollView; 40import android.widget.ImageView; 41import android.widget.LinearLayout; 42import android.widget.ListView; 43import android.widget.Spinner; 44import android.widget.TextView; 45import android.widget.Toast; 46 47/** 48 * This widget implements the dynamic action bar tab behavior that can change 49 * across different configurations or circumstances. 50 */ 51public class ScrollingTabContainerView extends HorizontalScrollView 52 implements AdapterView.OnItemClickListener { 53 private static final String TAG = "ScrollingTabContainerView"; 54 Runnable mTabSelector; 55 private TabClickListener mTabClickListener; 56 57 private LinearLayout mTabLayout; 58 private Spinner mTabSpinner; 59 private boolean mAllowCollapse; 60 61 int mMaxTabWidth; 62 int mStackedTabMaxWidth; 63 private int mContentHeight; 64 private int mSelectedTabIndex; 65 66 protected Animator mVisibilityAnim; 67 protected final VisibilityAnimListener mVisAnimListener = new VisibilityAnimListener(); 68 69 private static final TimeInterpolator sAlphaInterpolator = new DecelerateInterpolator(); 70 71 private static final int FADE_DURATION = 200; 72 73 public ScrollingTabContainerView(Context context) { 74 super(context); 75 setHorizontalScrollBarEnabled(false); 76 77 ActionBarPolicy abp = ActionBarPolicy.get(context); 78 setContentHeight(abp.getTabContainerHeight()); 79 mStackedTabMaxWidth = abp.getStackedTabMaxWidth(); 80 81 mTabLayout = createTabLayout(); 82 addView(mTabLayout, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, 83 ViewGroup.LayoutParams.MATCH_PARENT)); 84 } 85 86 @Override 87 public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 88 final int widthMode = MeasureSpec.getMode(widthMeasureSpec); 89 final boolean lockedExpanded = widthMode == MeasureSpec.EXACTLY; 90 setFillViewport(lockedExpanded); 91 92 final int childCount = mTabLayout.getChildCount(); 93 if (childCount > 1 && 94 (widthMode == MeasureSpec.EXACTLY || widthMode == MeasureSpec.AT_MOST)) { 95 if (childCount > 2) { 96 mMaxTabWidth = (int) (MeasureSpec.getSize(widthMeasureSpec) * 0.4f); 97 } else { 98 mMaxTabWidth = MeasureSpec.getSize(widthMeasureSpec) / 2; 99 } 100 mMaxTabWidth = Math.min(mMaxTabWidth, mStackedTabMaxWidth); 101 } else { 102 mMaxTabWidth = -1; 103 } 104 105 heightMeasureSpec = MeasureSpec.makeMeasureSpec(mContentHeight, MeasureSpec.EXACTLY); 106 107 final boolean canCollapse = !lockedExpanded && mAllowCollapse; 108 109 if (canCollapse) { 110 // See if we should expand 111 mTabLayout.measure(MeasureSpec.UNSPECIFIED, heightMeasureSpec); 112 if (mTabLayout.getMeasuredWidth() > MeasureSpec.getSize(widthMeasureSpec)) { 113 performCollapse(); 114 } else { 115 performExpand(); 116 } 117 } else { 118 performExpand(); 119 } 120 121 final int oldWidth = getMeasuredWidth(); 122 super.onMeasure(widthMeasureSpec, heightMeasureSpec); 123 final int newWidth = getMeasuredWidth(); 124 125 if (lockedExpanded && oldWidth != newWidth) { 126 // Recenter the tab display if we're at a new (scrollable) size. 127 setTabSelected(mSelectedTabIndex); 128 } 129 } 130 131 /** 132 * Indicates whether this view is collapsed into a dropdown menu instead 133 * of traditional tabs. 134 * @return true if showing as a spinner 135 */ 136 private boolean isCollapsed() { 137 return mTabSpinner != null && mTabSpinner.getParent() == this; 138 } 139 140 public void setAllowCollapse(boolean allowCollapse) { 141 mAllowCollapse = allowCollapse; 142 } 143 144 private void performCollapse() { 145 if (isCollapsed()) return; 146 147 if (mTabSpinner == null) { 148 mTabSpinner = createSpinner(); 149 } 150 removeView(mTabLayout); 151 addView(mTabSpinner, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, 152 ViewGroup.LayoutParams.MATCH_PARENT)); 153 if (mTabSpinner.getAdapter() == null) { 154 mTabSpinner.setAdapter(new TabAdapter()); 155 } 156 if (mTabSelector != null) { 157 removeCallbacks(mTabSelector); 158 mTabSelector = null; 159 } 160 mTabSpinner.setSelection(mSelectedTabIndex); 161 } 162 163 private boolean performExpand() { 164 if (!isCollapsed()) return false; 165 166 removeView(mTabSpinner); 167 addView(mTabLayout, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, 168 ViewGroup.LayoutParams.MATCH_PARENT)); 169 setTabSelected(mTabSpinner.getSelectedItemPosition()); 170 return false; 171 } 172 173 public void setTabSelected(int position) { 174 mSelectedTabIndex = position; 175 final int tabCount = mTabLayout.getChildCount(); 176 for (int i = 0; i < tabCount; i++) { 177 final View child = mTabLayout.getChildAt(i); 178 final boolean isSelected = i == position; 179 child.setSelected(isSelected); 180 if (isSelected) { 181 animateToTab(position); 182 } 183 } 184 if (mTabSpinner != null && position >= 0) { 185 mTabSpinner.setSelection(position); 186 } 187 } 188 189 public void setContentHeight(int contentHeight) { 190 mContentHeight = contentHeight; 191 requestLayout(); 192 } 193 194 private LinearLayout createTabLayout() { 195 final LinearLayout tabLayout = new LinearLayout(getContext(), null, 196 com.android.internal.R.attr.actionBarTabBarStyle); 197 tabLayout.setMeasureWithLargestChildEnabled(true); 198 tabLayout.setGravity(Gravity.CENTER); 199 tabLayout.setLayoutParams(new LinearLayout.LayoutParams( 200 LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.MATCH_PARENT)); 201 return tabLayout; 202 } 203 204 private Spinner createSpinner() { 205 final Spinner spinner = new Spinner(getContext(), null, 206 com.android.internal.R.attr.actionDropDownStyle); 207 spinner.setLayoutParams(new LinearLayout.LayoutParams( 208 LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.MATCH_PARENT)); 209 spinner.setOnItemClickListenerInt(this); 210 return spinner; 211 } 212 213 @Override 214 protected void onConfigurationChanged(Configuration newConfig) { 215 super.onConfigurationChanged(newConfig); 216 217 ActionBarPolicy abp = ActionBarPolicy.get(getContext()); 218 // Action bar can change size on configuration changes. 219 // Reread the desired height from the theme-specified style. 220 setContentHeight(abp.getTabContainerHeight()); 221 mStackedTabMaxWidth = abp.getStackedTabMaxWidth(); 222 } 223 224 public void animateToVisibility(int visibility) { 225 if (mVisibilityAnim != null) { 226 mVisibilityAnim.cancel(); 227 } 228 if (visibility == VISIBLE) { 229 if (getVisibility() != VISIBLE) { 230 setAlpha(0); 231 } 232 ObjectAnimator anim = ObjectAnimator.ofFloat(this, "alpha", 1); 233 anim.setDuration(FADE_DURATION); 234 anim.setInterpolator(sAlphaInterpolator); 235 236 anim.addListener(mVisAnimListener.withFinalVisibility(visibility)); 237 anim.start(); 238 } else { 239 ObjectAnimator anim = ObjectAnimator.ofFloat(this, "alpha", 0); 240 anim.setDuration(FADE_DURATION); 241 anim.setInterpolator(sAlphaInterpolator); 242 243 anim.addListener(mVisAnimListener.withFinalVisibility(visibility)); 244 anim.start(); 245 } 246 } 247 248 public void animateToTab(final int position) { 249 final View tabView = mTabLayout.getChildAt(position); 250 if (mTabSelector != null) { 251 removeCallbacks(mTabSelector); 252 } 253 mTabSelector = new Runnable() { 254 public void run() { 255 final int scrollPos = tabView.getLeft() - (getWidth() - tabView.getWidth()) / 2; 256 smoothScrollTo(scrollPos, 0); 257 mTabSelector = null; 258 } 259 }; 260 post(mTabSelector); 261 } 262 263 @Override 264 public void onAttachedToWindow() { 265 super.onAttachedToWindow(); 266 if (mTabSelector != null) { 267 // Re-post the selector we saved 268 post(mTabSelector); 269 } 270 } 271 272 @Override 273 public void onDetachedFromWindow() { 274 super.onDetachedFromWindow(); 275 if (mTabSelector != null) { 276 removeCallbacks(mTabSelector); 277 } 278 } 279 280 private TabView createTabView(ActionBar.Tab tab, boolean forAdapter) { 281 final TabView tabView = new TabView(getContext(), tab, forAdapter); 282 if (forAdapter) { 283 tabView.setBackgroundDrawable(null); 284 tabView.setLayoutParams(new ListView.LayoutParams(ListView.LayoutParams.MATCH_PARENT, 285 mContentHeight)); 286 } else { 287 tabView.setFocusable(true); 288 289 if (mTabClickListener == null) { 290 mTabClickListener = new TabClickListener(); 291 } 292 tabView.setOnClickListener(mTabClickListener); 293 } 294 return tabView; 295 } 296 297 public void addTab(ActionBar.Tab tab, boolean setSelected) { 298 TabView tabView = createTabView(tab, false); 299 mTabLayout.addView(tabView, new LinearLayout.LayoutParams(0, 300 LayoutParams.MATCH_PARENT, 1)); 301 if (mTabSpinner != null) { 302 ((TabAdapter) mTabSpinner.getAdapter()).notifyDataSetChanged(); 303 } 304 if (setSelected) { 305 tabView.setSelected(true); 306 } 307 if (mAllowCollapse) { 308 requestLayout(); 309 } 310 } 311 312 public void addTab(ActionBar.Tab tab, int position, boolean setSelected) { 313 final TabView tabView = createTabView(tab, false); 314 mTabLayout.addView(tabView, position, new LinearLayout.LayoutParams( 315 0, LayoutParams.MATCH_PARENT, 1)); 316 if (mTabSpinner != null) { 317 ((TabAdapter) mTabSpinner.getAdapter()).notifyDataSetChanged(); 318 } 319 if (setSelected) { 320 tabView.setSelected(true); 321 } 322 if (mAllowCollapse) { 323 requestLayout(); 324 } 325 } 326 327 public void updateTab(int position) { 328 ((TabView) mTabLayout.getChildAt(position)).update(); 329 if (mTabSpinner != null) { 330 ((TabAdapter) mTabSpinner.getAdapter()).notifyDataSetChanged(); 331 } 332 if (mAllowCollapse) { 333 requestLayout(); 334 } 335 } 336 337 public void removeTabAt(int position) { 338 mTabLayout.removeViewAt(position); 339 if (mTabSpinner != null) { 340 ((TabAdapter) mTabSpinner.getAdapter()).notifyDataSetChanged(); 341 } 342 if (mAllowCollapse) { 343 requestLayout(); 344 } 345 } 346 347 public void removeAllTabs() { 348 mTabLayout.removeAllViews(); 349 if (mTabSpinner != null) { 350 ((TabAdapter) mTabSpinner.getAdapter()).notifyDataSetChanged(); 351 } 352 if (mAllowCollapse) { 353 requestLayout(); 354 } 355 } 356 357 @Override 358 public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 359 TabView tabView = (TabView) view; 360 tabView.getTab().select(); 361 } 362 363 private class TabView extends LinearLayout implements OnLongClickListener { 364 private ActionBar.Tab mTab; 365 private TextView mTextView; 366 private ImageView mIconView; 367 private View mCustomView; 368 369 public TabView(Context context, ActionBar.Tab tab, boolean forList) { 370 super(context, null, com.android.internal.R.attr.actionBarTabStyle); 371 mTab = tab; 372 373 if (forList) { 374 setGravity(Gravity.START | Gravity.CENTER_VERTICAL); 375 } 376 377 update(); 378 } 379 380 public void bindTab(ActionBar.Tab tab) { 381 mTab = tab; 382 update(); 383 } 384 385 @Override 386 public void setSelected(boolean selected) { 387 final boolean changed = (isSelected() != selected); 388 super.setSelected(selected); 389 if (changed && selected) { 390 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SELECTED); 391 } 392 } 393 394 @Override 395 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 396 super.onInitializeAccessibilityEvent(event); 397 // This view masquerades as an action bar tab. 398 event.setClassName(ActionBar.Tab.class.getName()); 399 } 400 401 @Override 402 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 403 super.onInitializeAccessibilityNodeInfo(info); 404 // This view masquerades as an action bar tab. 405 info.setClassName(ActionBar.Tab.class.getName()); 406 } 407 408 @Override 409 public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 410 super.onMeasure(widthMeasureSpec, heightMeasureSpec); 411 412 // Re-measure if we went beyond our maximum size. 413 if (mMaxTabWidth > 0 && getMeasuredWidth() > mMaxTabWidth) { 414 super.onMeasure(MeasureSpec.makeMeasureSpec(mMaxTabWidth, MeasureSpec.EXACTLY), 415 heightMeasureSpec); 416 } 417 } 418 419 public void update() { 420 final ActionBar.Tab tab = mTab; 421 final View custom = tab.getCustomView(); 422 if (custom != null) { 423 final ViewParent customParent = custom.getParent(); 424 if (customParent != this) { 425 if (customParent != null) ((ViewGroup) customParent).removeView(custom); 426 addView(custom); 427 } 428 mCustomView = custom; 429 if (mTextView != null) mTextView.setVisibility(GONE); 430 if (mIconView != null) { 431 mIconView.setVisibility(GONE); 432 mIconView.setImageDrawable(null); 433 } 434 } else { 435 if (mCustomView != null) { 436 removeView(mCustomView); 437 mCustomView = null; 438 } 439 440 final Drawable icon = tab.getIcon(); 441 final CharSequence text = tab.getText(); 442 443 if (icon != null) { 444 if (mIconView == null) { 445 ImageView iconView = new ImageView(getContext()); 446 LayoutParams lp = new LayoutParams(LayoutParams.WRAP_CONTENT, 447 LayoutParams.WRAP_CONTENT); 448 lp.gravity = Gravity.CENTER_VERTICAL; 449 iconView.setLayoutParams(lp); 450 addView(iconView, 0); 451 mIconView = iconView; 452 } 453 mIconView.setImageDrawable(icon); 454 mIconView.setVisibility(VISIBLE); 455 } else if (mIconView != null) { 456 mIconView.setVisibility(GONE); 457 mIconView.setImageDrawable(null); 458 } 459 460 final boolean hasText = !TextUtils.isEmpty(text); 461 if (hasText) { 462 if (mTextView == null) { 463 TextView textView = new TextView(getContext(), null, 464 com.android.internal.R.attr.actionBarTabTextStyle); 465 textView.setEllipsize(TruncateAt.END); 466 LayoutParams lp = new LayoutParams(LayoutParams.WRAP_CONTENT, 467 LayoutParams.WRAP_CONTENT); 468 lp.gravity = Gravity.CENTER_VERTICAL; 469 textView.setLayoutParams(lp); 470 addView(textView); 471 mTextView = textView; 472 } 473 mTextView.setText(text); 474 mTextView.setVisibility(VISIBLE); 475 } else if (mTextView != null) { 476 mTextView.setVisibility(GONE); 477 mTextView.setText(null); 478 } 479 480 if (mIconView != null) { 481 mIconView.setContentDescription(tab.getContentDescription()); 482 } 483 484 if (!hasText && !TextUtils.isEmpty(tab.getContentDescription())) { 485 setOnLongClickListener(this); 486 } else { 487 setOnLongClickListener(null); 488 setLongClickable(false); 489 } 490 } 491 } 492 493 public boolean onLongClick(View v) { 494 final int[] screenPos = new int[2]; 495 getLocationOnScreen(screenPos); 496 497 final Context context = getContext(); 498 final int width = getWidth(); 499 final int height = getHeight(); 500 final int screenWidth = context.getResources().getDisplayMetrics().widthPixels; 501 502 Toast cheatSheet = Toast.makeText(context, mTab.getContentDescription(), 503 Toast.LENGTH_SHORT); 504 // Show under the tab 505 cheatSheet.setGravity(Gravity.TOP | Gravity.CENTER_HORIZONTAL, 506 (screenPos[0] + width / 2) - screenWidth / 2, height); 507 508 cheatSheet.show(); 509 return true; 510 } 511 512 public ActionBar.Tab getTab() { 513 return mTab; 514 } 515 } 516 517 private class TabAdapter extends BaseAdapter { 518 @Override 519 public int getCount() { 520 return mTabLayout.getChildCount(); 521 } 522 523 @Override 524 public Object getItem(int position) { 525 return ((TabView) mTabLayout.getChildAt(position)).getTab(); 526 } 527 528 @Override 529 public long getItemId(int position) { 530 return position; 531 } 532 533 @Override 534 public View getView(int position, View convertView, ViewGroup parent) { 535 if (convertView == null) { 536 convertView = createTabView((ActionBar.Tab) getItem(position), true); 537 } else { 538 ((TabView) convertView).bindTab((ActionBar.Tab) getItem(position)); 539 } 540 return convertView; 541 } 542 } 543 544 private class TabClickListener implements OnClickListener { 545 public void onClick(View view) { 546 TabView tabView = (TabView) view; 547 tabView.getTab().select(); 548 final int tabCount = mTabLayout.getChildCount(); 549 for (int i = 0; i < tabCount; i++) { 550 final View child = mTabLayout.getChildAt(i); 551 child.setSelected(child == view); 552 } 553 } 554 } 555 556 protected class VisibilityAnimListener implements Animator.AnimatorListener { 557 private boolean mCanceled = false; 558 private int mFinalVisibility; 559 560 public VisibilityAnimListener withFinalVisibility(int visibility) { 561 mFinalVisibility = visibility; 562 return this; 563 } 564 565 @Override 566 public void onAnimationStart(Animator animation) { 567 setVisibility(VISIBLE); 568 mVisibilityAnim = animation; 569 mCanceled = false; 570 } 571 572 @Override 573 public void onAnimationEnd(Animator animation) { 574 if (mCanceled) return; 575 576 mVisibilityAnim = null; 577 setVisibility(mFinalVisibility); 578 } 579 580 @Override 581 public void onAnimationCancel(Animator animation) { 582 mCanceled = true; 583 } 584 585 @Override 586 public void onAnimationRepeat(Animator animation) { 587 } 588 } 589} 590