ListPopupWindow.java revision 8d6d3b83fb765eefc6fd38de77f1f45d2523ab89
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 android.widget; 18 19import android.content.Context; 20import android.database.DataSetObserver; 21import android.graphics.Rect; 22import android.graphics.drawable.Drawable; 23import android.os.Handler; 24import android.util.AttributeSet; 25import android.util.Log; 26import android.view.KeyEvent; 27import android.view.MotionEvent; 28import android.view.View; 29import android.view.ViewGroup; 30import android.view.ViewParent; 31import android.view.View.MeasureSpec; 32import android.view.View.OnTouchListener; 33 34/** 35 * A ListPopupWindow anchors itself to a host view and displays a 36 * list of choices. 37 * 38 * <p>ListPopupWindow contains a number of tricky behaviors surrounding 39 * positioning, scrolling parents to fit the dropdown, interacting 40 * sanely with the IME if present, and others. 41 * 42 * @see android.widget.AutoCompleteTextView 43 * @see android.widget.Spinner 44 */ 45public class ListPopupWindow { 46 private static final String TAG = "ListPopupWindow"; 47 private static final boolean DEBUG = false; 48 49 /** 50 * This value controls the length of time that the user 51 * must leave a pointer down without scrolling to expand 52 * the autocomplete dropdown list to cover the IME. 53 */ 54 private static final int EXPAND_LIST_TIMEOUT = 250; 55 56 private Context mContext; 57 private PopupWindow mPopup; 58 private ListAdapter mAdapter; 59 private DropDownListView mDropDownList; 60 61 private int mDropDownHeight = ViewGroup.LayoutParams.WRAP_CONTENT; 62 private int mDropDownWidth = ViewGroup.LayoutParams.WRAP_CONTENT; 63 private int mDropDownHorizontalOffset; 64 private int mDropDownVerticalOffset; 65 66 private boolean mDropDownAlwaysVisible = false; 67 private boolean mForceIgnoreOutsideTouch = false; 68 69 private View mPromptView; 70 private int mPromptPosition = POSITION_PROMPT_ABOVE; 71 72 private DataSetObserver mObserver; 73 74 private View mDropDownAnchorView; 75 76 private Drawable mDropDownListHighlight; 77 78 private AdapterView.OnItemClickListener mItemClickListener; 79 private AdapterView.OnItemSelectedListener mItemSelectedListener; 80 81 private final ResizePopupRunnable mResizePopupRunnable = new ResizePopupRunnable(); 82 private final PopupTouchInterceptor mTouchInterceptor = new PopupTouchInterceptor(); 83 private final PopupScrollListener mScrollListener = new PopupScrollListener(); 84 private final ListSelectorHider mHideSelector = new ListSelectorHider(); 85 private Runnable mShowDropDownRunnable; 86 87 private Handler mHandler = new Handler(); 88 89 private Rect mTempRect = new Rect(); 90 91 private boolean mModal; 92 93 /** 94 * The provided prompt view should appear above list content. 95 * 96 * @see #setPromptPosition(int) 97 * @see #getPromptPosition() 98 * @see #setPromptView(View) 99 */ 100 public static final int POSITION_PROMPT_ABOVE = 0; 101 102 /** 103 * The provided prompt view should appear below list content. 104 * 105 * @see #setPromptPosition(int) 106 * @see #getPromptPosition() 107 * @see #setPromptView(View) 108 */ 109 public static final int POSITION_PROMPT_BELOW = 1; 110 111 /** 112 * Alias for {@link ViewGroup.LayoutParams#MATCH_PARENT}. 113 * If used to specify a popup width, the popup will match the width of the anchor view. 114 * If used to specify a popup height, the popup will fill available space. 115 */ 116 public static final int MATCH_PARENT = ViewGroup.LayoutParams.MATCH_PARENT; 117 118 /** 119 * Alias for {@link ViewGroup.LayoutParams#WRAP_CONTENT}. 120 * If used to specify a popup width, the popup will use the width of its content. 121 */ 122 public static final int WRAP_CONTENT = ViewGroup.LayoutParams.WRAP_CONTENT; 123 124 /** 125 * Mode for {@link #setInputMethodMode(int)}: the requirements for the 126 * input method should be based on the focusability of the popup. That is 127 * if it is focusable than it needs to work with the input method, else 128 * it doesn't. 129 */ 130 public static final int INPUT_METHOD_FROM_FOCUSABLE = PopupWindow.INPUT_METHOD_FROM_FOCUSABLE; 131 132 /** 133 * Mode for {@link #setInputMethodMode(int)}: this popup always needs to 134 * work with an input method, regardless of whether it is focusable. This 135 * means that it will always be displayed so that the user can also operate 136 * the input method while it is shown. 137 */ 138 public static final int INPUT_METHOD_NEEDED = PopupWindow.INPUT_METHOD_NEEDED; 139 140 /** 141 * Mode for {@link #setInputMethodMode(int)}: this popup never needs to 142 * work with an input method, regardless of whether it is focusable. This 143 * means that it will always be displayed to use as much space on the 144 * screen as needed, regardless of whether this covers the input method. 145 */ 146 public static final int INPUT_METHOD_NOT_NEEDED = PopupWindow.INPUT_METHOD_NOT_NEEDED; 147 148 /** 149 * Create a new, empty popup window capable of displaying items from a ListAdapter. 150 * Backgrounds should be set using {@link #setBackgroundDrawable(Drawable)}. 151 * 152 * @param context Context used for contained views. 153 */ 154 public ListPopupWindow(Context context) { 155 this(context, null, com.android.internal.R.attr.listPopupWindowStyle, 0); 156 } 157 158 /** 159 * Create a new, empty popup window capable of displaying items from a ListAdapter. 160 * Backgrounds should be set using {@link #setBackgroundDrawable(Drawable)}. 161 * 162 * @param context Context used for contained views. 163 * @param attrs Attributes from inflating parent views used to style the popup. 164 */ 165 public ListPopupWindow(Context context, AttributeSet attrs) { 166 this(context, attrs, com.android.internal.R.attr.listPopupWindowStyle, 0); 167 } 168 169 /** 170 * Create a new, empty popup window capable of displaying items from a ListAdapter. 171 * Backgrounds should be set using {@link #setBackgroundDrawable(Drawable)}. 172 * 173 * @param context Context used for contained views. 174 * @param attrs Attributes from inflating parent views used to style the popup. 175 * @param defStyleAttr Default style attribute to use for popup content. 176 */ 177 public ListPopupWindow(Context context, AttributeSet attrs, int defStyleAttr) { 178 this(context, attrs, defStyleAttr, 0); 179 } 180 181 /** 182 * Create a new, empty popup window capable of displaying items from a ListAdapter. 183 * Backgrounds should be set using {@link #setBackgroundDrawable(Drawable)}. 184 * 185 * @param context Context used for contained views. 186 * @param attrs Attributes from inflating parent views used to style the popup. 187 * @param defStyleAttr Style attribute to read for default styling of popup content. 188 * @param defStyleRes Style resource ID to use for default styling of popup content. 189 */ 190 public ListPopupWindow(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { 191 mContext = context; 192 mPopup = new PopupWindow(context, attrs, defStyleAttr, defStyleRes); 193 } 194 195 /** 196 * Sets the adapter that provides the data and the views to represent the data 197 * in this popup window. 198 * 199 * @param adapter The adapter to use to create this window's content. 200 */ 201 public void setAdapter(ListAdapter adapter) { 202 if (mObserver == null) { 203 mObserver = new PopupDataSetObserver(); 204 } else if (mAdapter != null) { 205 mAdapter.unregisterDataSetObserver(mObserver); 206 } 207 mAdapter = adapter; 208 if (mAdapter != null) { 209 adapter.registerDataSetObserver(mObserver); 210 } 211 212 if (mDropDownList != null) { 213 mDropDownList.setAdapter(mAdapter); 214 } 215 } 216 217 /** 218 * Set where the optional prompt view should appear. The default is 219 * {@link #POSITION_PROMPT_ABOVE}. 220 * 221 * @param position A position constant declaring where the prompt should be displayed. 222 * 223 * @see #POSITION_PROMPT_ABOVE 224 * @see #POSITION_PROMPT_BELOW 225 */ 226 public void setPromptPosition(int position) { 227 mPromptPosition = position; 228 } 229 230 /** 231 * @return Where the optional prompt view should appear. 232 * 233 * @see #POSITION_PROMPT_ABOVE 234 * @see #POSITION_PROMPT_BELOW 235 */ 236 public int getPromptPosition() { 237 return mPromptPosition; 238 } 239 240 /** 241 * Set whether this window should be modal when shown. 242 * 243 * <p>If a popup window is modal, it will receive all touch and key input. 244 * If the user touches outside the popup window's content area the popup window 245 * will be dismissed. 246 * 247 * @param modal {@code true} if the popup window should be modal, {@code false} otherwise. 248 */ 249 public void setModal(boolean modal) { 250 mModal = true; 251 mPopup.setFocusable(modal); 252 } 253 254 /** 255 * Returns whether the popup window will be modal when shown. 256 * 257 * @return {@code true} if the popup window will be modal, {@code false} otherwise. 258 */ 259 public boolean isModal() { 260 return mModal; 261 } 262 263 /** 264 * Forces outside touches to be ignored. Normally if {@link #isDropDownAlwaysVisible()} is 265 * false, we allow outside touch to dismiss the dropdown. If this is set to true, then we 266 * ignore outside touch even when the drop down is not set to always visible. 267 * 268 * @hide Used only by AutoCompleteTextView to handle some internal special cases. 269 */ 270 public void setForceIgnoreOutsideTouch(boolean forceIgnoreOutsideTouch) { 271 mForceIgnoreOutsideTouch = forceIgnoreOutsideTouch; 272 } 273 274 /** 275 * Sets whether the drop-down should remain visible under certain conditions. 276 * 277 * The drop-down will occupy the entire screen below {@link #getAnchorView} regardless 278 * of the size or content of the list. {@link #getBackground()} will fill any space 279 * that is not used by the list. 280 * 281 * @param dropDownAlwaysVisible Whether to keep the drop-down visible. 282 * 283 * @hide Only used by AutoCompleteTextView under special conditions. 284 */ 285 public void setDropDownAlwaysVisible(boolean dropDownAlwaysVisible) { 286 mDropDownAlwaysVisible = dropDownAlwaysVisible; 287 } 288 289 /** 290 * @return Whether the drop-down is visible under special conditions. 291 * 292 * @hide Only used by AutoCompleteTextView under special conditions. 293 */ 294 public boolean isDropDownAlwaysVisible() { 295 return mDropDownAlwaysVisible; 296 } 297 298 /** 299 * Sets the operating mode for the soft input area. 300 * 301 * @param mode The desired mode, see 302 * {@link android.view.WindowManager.LayoutParams#softInputMode} 303 * for the full list 304 * 305 * @see android.view.WindowManager.LayoutParams#softInputMode 306 * @see #getSoftInputMode() 307 */ 308 public void setSoftInputMode(int mode) { 309 mPopup.setSoftInputMode(mode); 310 } 311 312 /** 313 * Returns the current value in {@link #setSoftInputMode(int)}. 314 * 315 * @see #setSoftInputMode(int) 316 * @see android.view.WindowManager.LayoutParams#softInputMode 317 */ 318 public int getSoftInputMode() { 319 return mPopup.getSoftInputMode(); 320 } 321 322 /** 323 * Sets a drawable to use as the list item selector. 324 * 325 * @param selector List selector drawable to use in the popup. 326 */ 327 public void setListSelector(Drawable selector) { 328 mDropDownListHighlight = selector; 329 } 330 331 /** 332 * @return The background drawable for the popup window. 333 */ 334 public Drawable getBackground() { 335 return mPopup.getBackground(); 336 } 337 338 /** 339 * Sets a drawable to be the background for the popup window. 340 * 341 * @param d A drawable to set as the background. 342 */ 343 public void setBackgroundDrawable(Drawable d) { 344 mPopup.setBackgroundDrawable(d); 345 } 346 347 /** 348 * Set an animation style to use when the popup window is shown or dismissed. 349 * 350 * @param animationStyle Animation style to use. 351 */ 352 public void setAnimationStyle(int animationStyle) { 353 mPopup.setAnimationStyle(animationStyle); 354 } 355 356 /** 357 * Returns the animation style that will be used when the popup window is 358 * shown or dismissed. 359 * 360 * @return Animation style that will be used. 361 */ 362 public int getAnimationStyle() { 363 return mPopup.getAnimationStyle(); 364 } 365 366 /** 367 * Returns the view that will be used to anchor this popup. 368 * 369 * @return The popup's anchor view 370 */ 371 public View getAnchorView() { 372 return mDropDownAnchorView; 373 } 374 375 /** 376 * Sets the popup's anchor view. This popup will always be positioned relative to 377 * the anchor view when shown. 378 * 379 * @param anchor The view to use as an anchor. 380 */ 381 public void setAnchorView(View anchor) { 382 mDropDownAnchorView = anchor; 383 } 384 385 /** 386 * @return The horizontal offset of the popup from its anchor in pixels. 387 */ 388 public int getHorizontalOffset() { 389 return mDropDownHorizontalOffset; 390 } 391 392 /** 393 * Set the horizontal offset of this popup from its anchor view in pixels. 394 * 395 * @param offset The horizontal offset of the popup from its anchor. 396 */ 397 public void setHorizontalOffset(int offset) { 398 mDropDownHorizontalOffset = offset; 399 } 400 401 /** 402 * @return The vertical offset of the popup from its anchor in pixels. 403 */ 404 public int getVerticalOffset() { 405 return mDropDownVerticalOffset; 406 } 407 408 /** 409 * Set the vertical offset of this popup from its anchor view in pixels. 410 * 411 * @param offset The vertical offset of the popup from its anchor. 412 */ 413 public void setVerticalOffset(int offset) { 414 mDropDownVerticalOffset = offset; 415 } 416 417 /** 418 * @return The width of the popup window in pixels. 419 */ 420 public int getWidth() { 421 return mDropDownWidth; 422 } 423 424 /** 425 * Sets the width of the popup window in pixels. Can also be {@link #MATCH_PARENT} 426 * or {@link #WRAP_CONTENT}. 427 * 428 * @param width Width of the popup window. 429 */ 430 public void setWidth(int width) { 431 mDropDownWidth = width; 432 } 433 434 /** 435 * Sets the width of the popup window by the size of its content. The final width may be 436 * larger to accommodate styled window dressing. 437 * 438 * @param width Desired width of content in pixels. 439 */ 440 public void setContentWidth(int width) { 441 Drawable popupBackground = mPopup.getBackground(); 442 if (popupBackground != null) { 443 popupBackground.getPadding(mTempRect); 444 mDropDownWidth = mTempRect.left + mTempRect.right + width; 445 } 446 } 447 448 /** 449 * @return The height of the popup window in pixels. 450 */ 451 public int getHeight() { 452 return mDropDownHeight; 453 } 454 455 /** 456 * Sets the height of the popup window in pixels. Can also be {@link #MATCH_PARENT}. 457 * 458 * @param height Height of the popup window. 459 */ 460 public void setHeight(int height) { 461 mDropDownHeight = height; 462 } 463 464 /** 465 * Sets a listener to receive events when a list item is clicked. 466 * 467 * @param clickListener Listener to register 468 * 469 * @see ListView#setOnItemClickListener(android.widget.AdapterView.OnItemClickListener) 470 */ 471 public void setOnItemClickListener(AdapterView.OnItemClickListener clickListener) { 472 mItemClickListener = clickListener; 473 } 474 475 /** 476 * Sets a listener to receive events when a list item is selected. 477 * 478 * @param selectedListener Listener to register. 479 * 480 * @see ListView#setOnItemSelectedListener(android.widget.AdapterView.OnItemSelectedListener) 481 */ 482 public void setOnItemSelectedListener(AdapterView.OnItemSelectedListener selectedListener) { 483 mItemSelectedListener = selectedListener; 484 } 485 486 /** 487 * Set a view to act as a user prompt for this popup window. Where the prompt view will appear 488 * is controlled by {@link #setPromptPosition(int)}. 489 * 490 * @param prompt View to use as an informational prompt. 491 */ 492 public void setPromptView(View prompt) { 493 boolean showing = isShowing(); 494 if (showing) { 495 removePromptView(); 496 } 497 mPromptView = prompt; 498 if (showing) { 499 show(); 500 } 501 } 502 503 /** 504 * Post a {@link #show()} call to the UI thread. 505 */ 506 public void postShow() { 507 mHandler.post(mShowDropDownRunnable); 508 } 509 510 /** 511 * Show the popup list. If the list is already showing, this method 512 * will recalculate the popup's size and position. 513 */ 514 public void show() { 515 int height = buildDropDown(); 516 517 int widthSpec = 0; 518 int heightSpec = 0; 519 520 boolean noInputMethod = isInputMethodNotNeeded(); 521 522 if (mPopup.isShowing()) { 523 if (mDropDownWidth == ViewGroup.LayoutParams.MATCH_PARENT) { 524 // The call to PopupWindow's update method below can accept -1 for any 525 // value you do not want to update. 526 widthSpec = -1; 527 } else if (mDropDownWidth == ViewGroup.LayoutParams.WRAP_CONTENT) { 528 widthSpec = getAnchorView().getWidth(); 529 } else { 530 widthSpec = mDropDownWidth; 531 } 532 533 if (mDropDownHeight == ViewGroup.LayoutParams.MATCH_PARENT) { 534 // The call to PopupWindow's update method below can accept -1 for any 535 // value you do not want to update. 536 heightSpec = noInputMethod ? height : ViewGroup.LayoutParams.MATCH_PARENT; 537 if (noInputMethod) { 538 mPopup.setWindowLayoutMode( 539 mDropDownWidth == ViewGroup.LayoutParams.MATCH_PARENT ? 540 ViewGroup.LayoutParams.MATCH_PARENT : 0, 0); 541 } else { 542 mPopup.setWindowLayoutMode( 543 mDropDownWidth == ViewGroup.LayoutParams.MATCH_PARENT ? 544 ViewGroup.LayoutParams.MATCH_PARENT : 0, 545 ViewGroup.LayoutParams.MATCH_PARENT); 546 } 547 } else if (mDropDownHeight == ViewGroup.LayoutParams.WRAP_CONTENT) { 548 heightSpec = height; 549 } else { 550 heightSpec = mDropDownHeight; 551 } 552 553 mPopup.setOutsideTouchable(!mForceIgnoreOutsideTouch && !mDropDownAlwaysVisible); 554 555 mPopup.update(getAnchorView(), mDropDownHorizontalOffset, 556 mDropDownVerticalOffset, widthSpec, heightSpec); 557 } else { 558 if (mDropDownWidth == ViewGroup.LayoutParams.MATCH_PARENT) { 559 widthSpec = ViewGroup.LayoutParams.MATCH_PARENT; 560 } else { 561 if (mDropDownWidth == ViewGroup.LayoutParams.WRAP_CONTENT) { 562 mPopup.setWidth(getAnchorView().getWidth()); 563 } else { 564 mPopup.setWidth(mDropDownWidth); 565 } 566 } 567 568 if (mDropDownHeight == ViewGroup.LayoutParams.MATCH_PARENT) { 569 heightSpec = ViewGroup.LayoutParams.MATCH_PARENT; 570 } else { 571 if (mDropDownHeight == ViewGroup.LayoutParams.WRAP_CONTENT) { 572 mPopup.setHeight(height); 573 } else { 574 mPopup.setHeight(mDropDownHeight); 575 } 576 } 577 578 mPopup.setWindowLayoutMode(widthSpec, heightSpec); 579 mPopup.setInputMethodMode(PopupWindow.INPUT_METHOD_NEEDED); 580 mPopup.setClipToScreenEnabled(true); 581 582 // use outside touchable to dismiss drop down when touching outside of it, so 583 // only set this if the dropdown is not always visible 584 mPopup.setOutsideTouchable(!mForceIgnoreOutsideTouch && !mDropDownAlwaysVisible); 585 mPopup.setTouchInterceptor(mTouchInterceptor); 586 mPopup.showAsDropDown(getAnchorView(), 587 mDropDownHorizontalOffset, mDropDownVerticalOffset); 588 mDropDownList.setSelection(ListView.INVALID_POSITION); 589 590 if (!mModal || mDropDownList.isInTouchMode()) { 591 clearListSelection(); 592 } 593 if (!mModal) { 594 mHandler.post(mHideSelector); 595 } 596 } 597 } 598 599 /** 600 * Dismiss the popup window. 601 */ 602 public void dismiss() { 603 mPopup.dismiss(); 604 removePromptView(); 605 mPopup.setContentView(null); 606 mDropDownList = null; 607 } 608 609 /** 610 * Set a listener to receive a callback when the popup is dismissed. 611 * 612 * @param listener Listener that will be notified when the popup is dismissed. 613 */ 614 public void setOnDismissListener(PopupWindow.OnDismissListener listener) { 615 mPopup.setOnDismissListener(listener); 616 } 617 618 private void removePromptView() { 619 if (mPromptView != null) { 620 final ViewParent parent = mPromptView.getParent(); 621 if (parent instanceof ViewGroup) { 622 final ViewGroup group = (ViewGroup) parent; 623 group.removeView(mPromptView); 624 } 625 } 626 } 627 628 /** 629 * Control how the popup operates with an input method: one of 630 * {@link #INPUT_METHOD_FROM_FOCUSABLE}, {@link #INPUT_METHOD_NEEDED}, 631 * or {@link #INPUT_METHOD_NOT_NEEDED}. 632 * 633 * <p>If the popup is showing, calling this method will take effect only 634 * the next time the popup is shown or through a manual call to the {@link #show()} 635 * method.</p> 636 * 637 * @see #getInputMethodMode() 638 * @see #show() 639 */ 640 public void setInputMethodMode(int mode) { 641 mPopup.setInputMethodMode(mode); 642 } 643 644 /** 645 * Return the current value in {@link #setInputMethodMode(int)}. 646 * 647 * @see #setInputMethodMode(int) 648 */ 649 public int getInputMethodMode() { 650 return mPopup.getInputMethodMode(); 651 } 652 653 /** 654 * Set the selected position of the list. 655 * Only valid when {@link #isShowing()} == {@code true}. 656 * 657 * @param position List position to set as selected. 658 */ 659 public void setSelection(int position) { 660 DropDownListView list = mDropDownList; 661 if (isShowing() && list != null) { 662 list.mListSelectionHidden = false; 663 list.setSelection(position); 664 if (list.getChoiceMode() != ListView.CHOICE_MODE_NONE) { 665 list.setItemChecked(position, true); 666 } 667 } 668 } 669 670 /** 671 * Clear any current list selection. 672 * Only valid when {@link #isShowing()} == {@code true}. 673 */ 674 public void clearListSelection() { 675 final DropDownListView list = mDropDownList; 676 if (list != null) { 677 // WARNING: Please read the comment where mListSelectionHidden is declared 678 list.mListSelectionHidden = true; 679 list.hideSelector(); 680 list.requestLayout(); 681 } 682 } 683 684 /** 685 * @return {@code true} if the popup is currently showing, {@code false} otherwise. 686 */ 687 public boolean isShowing() { 688 return mPopup.isShowing(); 689 } 690 691 /** 692 * @return {@code true} if this popup is configured to assume the user does not need 693 * to interact with the IME while it is showing, {@code false} otherwise. 694 */ 695 public boolean isInputMethodNotNeeded() { 696 return mPopup.getInputMethodMode() == INPUT_METHOD_NOT_NEEDED; 697 } 698 699 /** 700 * Perform an item click operation on the specified list adapter position. 701 * 702 * @param position Adapter position for performing the click 703 * @return true if the click action could be performed, false if not. 704 * (e.g. if the popup was not showing, this method would return false.) 705 */ 706 public boolean performItemClick(int position) { 707 if (isShowing()) { 708 if (mItemClickListener != null) { 709 final DropDownListView list = mDropDownList; 710 final View child = list.getChildAt(position - list.getFirstVisiblePosition()); 711 final ListAdapter adapter = list.getAdapter(); 712 mItemClickListener.onItemClick(list, child, position, adapter.getItemId(position)); 713 } 714 return true; 715 } 716 return false; 717 } 718 719 /** 720 * @return The currently selected item or null if the popup is not showing. 721 */ 722 public Object getSelectedItem() { 723 if (!isShowing()) { 724 return null; 725 } 726 return mDropDownList.getSelectedItem(); 727 } 728 729 /** 730 * @return The position of the currently selected item or {@link ListView#INVALID_POSITION} 731 * if {@link #isShowing()} == {@code false}. 732 * 733 * @see ListView#getSelectedItemPosition() 734 */ 735 public int getSelectedItemPosition() { 736 if (!isShowing()) { 737 return ListView.INVALID_POSITION; 738 } 739 return mDropDownList.getSelectedItemPosition(); 740 } 741 742 /** 743 * @return The ID of the currently selected item or {@link ListView#INVALID_ROW_ID} 744 * if {@link #isShowing()} == {@code false}. 745 * 746 * @see ListView#getSelectedItemId() 747 */ 748 public long getSelectedItemId() { 749 if (!isShowing()) { 750 return ListView.INVALID_ROW_ID; 751 } 752 return mDropDownList.getSelectedItemId(); 753 } 754 755 /** 756 * @return The View for the currently selected item or null if 757 * {@link #isShowing()} == {@code false}. 758 * 759 * @see ListView#getSelectedView() 760 */ 761 public View getSelectedView() { 762 if (!isShowing()) { 763 return null; 764 } 765 return mDropDownList.getSelectedView(); 766 } 767 768 /** 769 * @return The {@link ListView} displayed within the popup window. 770 * Only valid when {@link #isShowing()} == {@code true}. 771 */ 772 public ListView getListView() { 773 return mDropDownList; 774 } 775 776 /** 777 * Filter key down events. By forwarding key down events to this function, 778 * views using non-modal ListPopupWindow can have it handle key selection of items. 779 * 780 * @param keyCode keyCode param passed to the host view's onKeyDown 781 * @param event event param passed to the host view's onKeyDown 782 * @return true if the event was handled, false if it was ignored. 783 * 784 * @see #setModal(boolean) 785 */ 786 public boolean onKeyDown(int keyCode, KeyEvent event) { 787 // when the drop down is shown, we drive it directly 788 if (isShowing()) { 789 // the key events are forwarded to the list in the drop down view 790 // note that ListView handles space but we don't want that to happen 791 // also if selection is not currently in the drop down, then don't 792 // let center or enter presses go there since that would cause it 793 // to select one of its items 794 if (keyCode != KeyEvent.KEYCODE_SPACE 795 && (mDropDownList.getSelectedItemPosition() >= 0 796 || (keyCode != KeyEvent.KEYCODE_ENTER 797 && keyCode != KeyEvent.KEYCODE_DPAD_CENTER))) { 798 int curIndex = mDropDownList.getSelectedItemPosition(); 799 boolean consumed; 800 801 final boolean below = !mPopup.isAboveAnchor(); 802 803 final ListAdapter adapter = mAdapter; 804 805 boolean allEnabled; 806 int firstItem = Integer.MAX_VALUE; 807 int lastItem = Integer.MIN_VALUE; 808 809 if (adapter != null) { 810 allEnabled = adapter.areAllItemsEnabled(); 811 firstItem = allEnabled ? 0 : 812 mDropDownList.lookForSelectablePosition(0, true); 813 lastItem = allEnabled ? adapter.getCount() - 1 : 814 mDropDownList.lookForSelectablePosition(adapter.getCount() - 1, false); 815 } 816 817 if ((below && keyCode == KeyEvent.KEYCODE_DPAD_UP && curIndex <= firstItem) || 818 (!below && keyCode == KeyEvent.KEYCODE_DPAD_DOWN && curIndex >= lastItem)) { 819 // When the selection is at the top, we block the key 820 // event to prevent focus from moving. 821 clearListSelection(); 822 mPopup.setInputMethodMode(PopupWindow.INPUT_METHOD_NEEDED); 823 show(); 824 return true; 825 } else { 826 // WARNING: Please read the comment where mListSelectionHidden 827 // is declared 828 mDropDownList.mListSelectionHidden = false; 829 } 830 831 consumed = mDropDownList.onKeyDown(keyCode, event); 832 if (DEBUG) Log.v(TAG, "Key down: code=" + keyCode + " list consumed=" + consumed); 833 834 if (consumed) { 835 // If it handled the key event, then the user is 836 // navigating in the list, so we should put it in front. 837 mPopup.setInputMethodMode(PopupWindow.INPUT_METHOD_NOT_NEEDED); 838 // Here's a little trick we need to do to make sure that 839 // the list view is actually showing its focus indicator, 840 // by ensuring it has focus and getting its window out 841 // of touch mode. 842 mDropDownList.requestFocusFromTouch(); 843 show(); 844 845 switch (keyCode) { 846 // avoid passing the focus from the text view to the 847 // next component 848 case KeyEvent.KEYCODE_ENTER: 849 case KeyEvent.KEYCODE_DPAD_CENTER: 850 case KeyEvent.KEYCODE_DPAD_DOWN: 851 case KeyEvent.KEYCODE_DPAD_UP: 852 return true; 853 } 854 } else { 855 if (below && keyCode == KeyEvent.KEYCODE_DPAD_DOWN) { 856 // when the selection is at the bottom, we block the 857 // event to avoid going to the next focusable widget 858 if (curIndex == lastItem) { 859 return true; 860 } 861 } else if (!below && keyCode == KeyEvent.KEYCODE_DPAD_UP && 862 curIndex == firstItem) { 863 return true; 864 } 865 } 866 } 867 } 868 869 return false; 870 } 871 872 /** 873 * Filter key down events. By forwarding key up events to this function, 874 * views using non-modal ListPopupWindow can have it handle key selection of items. 875 * 876 * @param keyCode keyCode param passed to the host view's onKeyUp 877 * @param event event param passed to the host view's onKeyUp 878 * @return true if the event was handled, false if it was ignored. 879 * 880 * @see #setModal(boolean) 881 */ 882 public boolean onKeyUp(int keyCode, KeyEvent event) { 883 if (isShowing() && mDropDownList.getSelectedItemPosition() >= 0) { 884 boolean consumed = mDropDownList.onKeyUp(keyCode, event); 885 if (consumed) { 886 switch (keyCode) { 887 // if the list accepts the key events and the key event 888 // was a click, the text view gets the selected item 889 // from the drop down as its content 890 case KeyEvent.KEYCODE_ENTER: 891 case KeyEvent.KEYCODE_DPAD_CENTER: 892 dismiss(); 893 break; 894 } 895 } 896 return consumed; 897 } 898 return false; 899 } 900 901 /** 902 * Filter pre-IME key events. By forwarding {@link View#onKeyPreIme(int, KeyEvent)} 903 * events to this function, views using ListPopupWindow can have it dismiss the popup 904 * when the back key is pressed. 905 * 906 * @param keyCode keyCode param passed to the host view's onKeyPreIme 907 * @param event event param passed to the host view's onKeyPreIme 908 * @return true if the event was handled, false if it was ignored. 909 * 910 * @see #setModal(boolean) 911 */ 912 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 913 if (keyCode == KeyEvent.KEYCODE_BACK && isShowing()) { 914 // special case for the back key, we do not even try to send it 915 // to the drop down list but instead, consume it immediately 916 final View anchorView = mDropDownAnchorView; 917 if (event.getAction() == KeyEvent.ACTION_DOWN && event.getRepeatCount() == 0) { 918 KeyEvent.DispatcherState state = anchorView.getKeyDispatcherState(); 919 if (state != null) { 920 state.startTracking(event, this); 921 } 922 return true; 923 } else if (event.getAction() == KeyEvent.ACTION_UP) { 924 KeyEvent.DispatcherState state = anchorView.getKeyDispatcherState(); 925 if (state != null) { 926 state.handleUpEvent(event); 927 } 928 if (event.isTracking() && !event.isCanceled()) { 929 dismiss(); 930 return true; 931 } 932 } 933 } 934 return false; 935 } 936 937 /** 938 * <p>Builds the popup window's content and returns the height the popup 939 * should have. Returns -1 when the content already exists.</p> 940 * 941 * @return the content's height or -1 if content already exists 942 */ 943 private int buildDropDown() { 944 ViewGroup dropDownView; 945 int otherHeights = 0; 946 947 if (mDropDownList == null) { 948 Context context = mContext; 949 950 /** 951 * This Runnable exists for the sole purpose of checking if the view layout has got 952 * completed and if so call showDropDown to display the drop down. This is used to show 953 * the drop down as soon as possible after user opens up the search dialog, without 954 * waiting for the normal UI pipeline to do it's job which is slower than this method. 955 */ 956 mShowDropDownRunnable = new Runnable() { 957 public void run() { 958 // View layout should be all done before displaying the drop down. 959 View view = getAnchorView(); 960 if (view != null && view.getWindowToken() != null) { 961 show(); 962 } 963 } 964 }; 965 966 mDropDownList = new DropDownListView(context, !mModal); 967 if (mDropDownListHighlight != null) { 968 mDropDownList.setSelector(mDropDownListHighlight); 969 } 970 mDropDownList.setAdapter(mAdapter); 971 mDropDownList.setVerticalFadingEdgeEnabled(true); 972 mDropDownList.setOnItemClickListener(mItemClickListener); 973 mDropDownList.setFocusable(true); 974 mDropDownList.setFocusableInTouchMode(true); 975 mDropDownList.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { 976 public void onItemSelected(AdapterView<?> parent, View view, 977 int position, long id) { 978 979 if (position != -1) { 980 DropDownListView dropDownList = mDropDownList; 981 982 if (dropDownList != null) { 983 dropDownList.mListSelectionHidden = false; 984 } 985 } 986 } 987 988 public void onNothingSelected(AdapterView<?> parent) { 989 } 990 }); 991 mDropDownList.setOnScrollListener(mScrollListener); 992 993 if (mItemSelectedListener != null) { 994 mDropDownList.setOnItemSelectedListener(mItemSelectedListener); 995 } 996 997 dropDownView = mDropDownList; 998 999 View hintView = mPromptView; 1000 if (hintView != null) { 1001 // if an hint has been specified, we accomodate more space for it and 1002 // add a text view in the drop down menu, at the bottom of the list 1003 LinearLayout hintContainer = new LinearLayout(context); 1004 hintContainer.setOrientation(LinearLayout.VERTICAL); 1005 1006 LinearLayout.LayoutParams hintParams = new LinearLayout.LayoutParams( 1007 ViewGroup.LayoutParams.MATCH_PARENT, 0, 1.0f 1008 ); 1009 1010 switch (mPromptPosition) { 1011 case POSITION_PROMPT_BELOW: 1012 hintContainer.addView(dropDownView, hintParams); 1013 hintContainer.addView(hintView); 1014 break; 1015 1016 case POSITION_PROMPT_ABOVE: 1017 hintContainer.addView(hintView); 1018 hintContainer.addView(dropDownView, hintParams); 1019 break; 1020 1021 default: 1022 Log.e(TAG, "Invalid hint position " + mPromptPosition); 1023 break; 1024 } 1025 1026 // measure the hint's height to find how much more vertical space 1027 // we need to add to the drop down's height 1028 int widthSpec = MeasureSpec.makeMeasureSpec(mDropDownWidth, MeasureSpec.AT_MOST); 1029 int heightSpec = MeasureSpec.UNSPECIFIED; 1030 hintView.measure(widthSpec, heightSpec); 1031 1032 hintParams = (LinearLayout.LayoutParams) hintView.getLayoutParams(); 1033 otherHeights = hintView.getMeasuredHeight() + hintParams.topMargin 1034 + hintParams.bottomMargin; 1035 1036 dropDownView = hintContainer; 1037 } 1038 1039 mPopup.setContentView(dropDownView); 1040 } else { 1041 dropDownView = (ViewGroup) mPopup.getContentView(); 1042 final View view = mPromptView; 1043 if (view != null) { 1044 LinearLayout.LayoutParams hintParams = 1045 (LinearLayout.LayoutParams) view.getLayoutParams(); 1046 otherHeights = view.getMeasuredHeight() + hintParams.topMargin 1047 + hintParams.bottomMargin; 1048 } 1049 } 1050 1051 // Max height available on the screen for a popup. 1052 boolean ignoreBottomDecorations = 1053 mPopup.getInputMethodMode() == PopupWindow.INPUT_METHOD_NOT_NEEDED; 1054 final int maxHeight = mPopup.getMaxAvailableHeight( 1055 getAnchorView(), mDropDownVerticalOffset, ignoreBottomDecorations); 1056 1057 // getMaxAvailableHeight() subtracts the padding, so we put it back, 1058 // to get the available height for the whole window 1059 int padding = 0; 1060 Drawable background = mPopup.getBackground(); 1061 if (background != null) { 1062 background.getPadding(mTempRect); 1063 padding = mTempRect.top + mTempRect.bottom; 1064 } 1065 1066 if (mDropDownAlwaysVisible || mDropDownHeight == ViewGroup.LayoutParams.MATCH_PARENT) { 1067 return maxHeight + padding; 1068 } 1069 1070 final int listContent = mDropDownList.measureHeightOfChildren(MeasureSpec.UNSPECIFIED, 1071 0, ListView.NO_POSITION, maxHeight - otherHeights, 2); 1072 // add padding only if the list has items in it, that way we don't show 1073 // the popup if it is not needed 1074 if (listContent > 0) otherHeights += padding; 1075 1076 return listContent + otherHeights; 1077 } 1078 1079 /** 1080 * <p>Wrapper class for a ListView. This wrapper can hijack the focus to 1081 * make sure the list uses the appropriate drawables and states when 1082 * displayed on screen within a drop down. The focus is never actually 1083 * passed to the drop down in this mode; the list only looks focused.</p> 1084 */ 1085 private static class DropDownListView extends ListView { 1086 private static final String TAG = ListPopupWindow.TAG + ".DropDownListView"; 1087 /* 1088 * WARNING: This is a workaround for a touch mode issue. 1089 * 1090 * Touch mode is propagated lazily to windows. This causes problems in 1091 * the following scenario: 1092 * - Type something in the AutoCompleteTextView and get some results 1093 * - Move down with the d-pad to select an item in the list 1094 * - Move up with the d-pad until the selection disappears 1095 * - Type more text in the AutoCompleteTextView *using the soft keyboard* 1096 * and get new results; you are now in touch mode 1097 * - The selection comes back on the first item in the list, even though 1098 * the list is supposed to be in touch mode 1099 * 1100 * Using the soft keyboard triggers the touch mode change but that change 1101 * is propagated to our window only after the first list layout, therefore 1102 * after the list attempts to resurrect the selection. 1103 * 1104 * The trick to work around this issue is to pretend the list is in touch 1105 * mode when we know that the selection should not appear, that is when 1106 * we know the user moved the selection away from the list. 1107 * 1108 * This boolean is set to true whenever we explicitly hide the list's 1109 * selection and reset to false whenever we know the user moved the 1110 * selection back to the list. 1111 * 1112 * When this boolean is true, isInTouchMode() returns true, otherwise it 1113 * returns super.isInTouchMode(). 1114 */ 1115 private boolean mListSelectionHidden; 1116 1117 /** 1118 * True if this wrapper should fake focus. 1119 */ 1120 private boolean mHijackFocus; 1121 1122 /** 1123 * <p>Creates a new list view wrapper.</p> 1124 * 1125 * @param context this view's context 1126 */ 1127 public DropDownListView(Context context, boolean hijackFocus) { 1128 super(context, null, com.android.internal.R.attr.dropDownListViewStyle); 1129 mHijackFocus = hijackFocus; 1130 // TODO: Add an API to control this 1131 setCacheColorHint(0); // Transparent, since the background drawable could be anything. 1132 } 1133 1134 /** 1135 * <p>Avoids jarring scrolling effect by ensuring that list elements 1136 * made of a text view fit on a single line.</p> 1137 * 1138 * @param position the item index in the list to get a view for 1139 * @return the view for the specified item 1140 */ 1141 @Override 1142 View obtainView(int position, boolean[] isScrap) { 1143 View view = super.obtainView(position, isScrap); 1144 1145 if (view instanceof TextView) { 1146 ((TextView) view).setHorizontallyScrolling(true); 1147 } 1148 1149 return view; 1150 } 1151 1152 @Override 1153 public boolean isInTouchMode() { 1154 // WARNING: Please read the comment where mListSelectionHidden is declared 1155 return (mHijackFocus && mListSelectionHidden) || super.isInTouchMode(); 1156 } 1157 1158 /** 1159 * <p>Returns the focus state in the drop down.</p> 1160 * 1161 * @return true always if hijacking focus 1162 */ 1163 @Override 1164 public boolean hasWindowFocus() { 1165 return mHijackFocus || super.hasWindowFocus(); 1166 } 1167 1168 /** 1169 * <p>Returns the focus state in the drop down.</p> 1170 * 1171 * @return true always if hijacking focus 1172 */ 1173 @Override 1174 public boolean isFocused() { 1175 return mHijackFocus || super.isFocused(); 1176 } 1177 1178 /** 1179 * <p>Returns the focus state in the drop down.</p> 1180 * 1181 * @return true always if hijacking focus 1182 */ 1183 @Override 1184 public boolean hasFocus() { 1185 return mHijackFocus || super.hasFocus(); 1186 } 1187 } 1188 1189 private class PopupDataSetObserver extends DataSetObserver { 1190 @Override 1191 public void onChanged() { 1192 if (isShowing()) { 1193 // Resize the popup to fit new content 1194 show(); 1195 } 1196 } 1197 1198 @Override 1199 public void onInvalidated() { 1200 dismiss(); 1201 } 1202 } 1203 1204 private class ListSelectorHider implements Runnable { 1205 public void run() { 1206 clearListSelection(); 1207 } 1208 } 1209 1210 private class ResizePopupRunnable implements Runnable { 1211 public void run() { 1212 mPopup.setInputMethodMode(PopupWindow.INPUT_METHOD_NOT_NEEDED); 1213 show(); 1214 } 1215 } 1216 1217 private class PopupTouchInterceptor implements OnTouchListener { 1218 public boolean onTouch(View v, MotionEvent event) { 1219 final int action = event.getAction(); 1220 final int x = (int) event.getX(); 1221 final int y = (int) event.getY(); 1222 1223 if (action == MotionEvent.ACTION_DOWN && 1224 mPopup != null && mPopup.isShowing() && 1225 (x >= 0 && x < getWidth() && y >= 0 && y < getHeight())) { 1226 mHandler.postDelayed(mResizePopupRunnable, EXPAND_LIST_TIMEOUT); 1227 } else if (action == MotionEvent.ACTION_UP) { 1228 mHandler.removeCallbacks(mResizePopupRunnable); 1229 } 1230 return false; 1231 } 1232 } 1233 1234 private class PopupScrollListener implements ListView.OnScrollListener { 1235 public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, 1236 int totalItemCount) { 1237 1238 } 1239 1240 public void onScrollStateChanged(AbsListView view, int scrollState) { 1241 if (scrollState == SCROLL_STATE_TOUCH_SCROLL && 1242 !isInputMethodNotNeeded() && mPopup.getContentView() != null) { 1243 mHandler.removeCallbacks(mResizePopupRunnable); 1244 mResizePopupRunnable.run(); 1245 } 1246 } 1247 } 1248} 1249