Workspace.java revision 546917a5ad2ed8fb2013982156044faa29d11fc9
1/* 2 * Copyright (C) 2008 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.launcher2; 18 19import android.app.WallpaperManager; 20import android.content.Context; 21import android.content.Intent; 22import android.content.ComponentName; 23import android.content.res.TypedArray; 24import android.content.pm.PackageManager; 25import android.graphics.Canvas; 26import android.graphics.Rect; 27import android.graphics.drawable.Drawable; 28import android.os.Parcelable; 29import android.os.Parcel; 30import android.util.AttributeSet; 31import android.util.Log; 32import android.view.MotionEvent; 33import android.view.VelocityTracker; 34import android.view.View; 35import android.view.ViewConfiguration; 36import android.view.ViewGroup; 37import android.view.ViewParent; 38import android.widget.Scroller; 39import android.widget.TextView; 40 41import java.util.ArrayList; 42 43/** 44 * The workspace is a wide area with a wallpaper and a finite number of screens. Each 45 * screen contains a number of icons, folders or widgets the user can interact with. 46 * A workspace is meant to be used with a fixed width only. 47 */ 48public class Workspace extends ViewGroup implements DropTarget, DragSource, DragScroller { 49 @SuppressWarnings({"UnusedDeclaration"}) 50 private static final String TAG = "Launcher.Workspace"; 51 private static final int INVALID_SCREEN = -1; 52 53 /** 54 * The velocity at which a fling gesture will cause us to snap to the next screen 55 */ 56 private static final int SNAP_VELOCITY = 1000; 57 58 private final WallpaperManager mWallpaperManager; 59 60 private int mDefaultScreen; 61 62 private boolean mFirstLayout = true; 63 64 private int mCurrentScreen; 65 private int mNextScreen = INVALID_SCREEN; 66 private Scroller mScroller; 67 private VelocityTracker mVelocityTracker; 68 69 /** 70 * CellInfo for the cell that is currently being dragged 71 */ 72 private CellLayout.CellInfo mDragInfo; 73 74 /** 75 * Target drop area calculated during last acceptDrop call. 76 */ 77 private int[] mTargetCell = null; 78 79 private float mLastMotionX; 80 private float mLastMotionY; 81 82 private final static int TOUCH_STATE_REST = 0; 83 private final static int TOUCH_STATE_SCROLLING = 1; 84 85 private int mTouchState = TOUCH_STATE_REST; 86 87 private OnLongClickListener mLongClickListener; 88 89 private Launcher mLauncher; 90 private DragController mDragController; 91 92 /** 93 * Cache of vacant cells, used during drag events and invalidated as needed. 94 */ 95 private CellLayout.CellInfo mVacantCache = null; 96 97 private int[] mTempCell = new int[2]; 98 private int[] mTempEstimate = new int[2]; 99 100 private boolean mAllowLongPress = true; 101 102 private int mTouchSlop; 103 private int mMaximumVelocity; 104 105 private Drawable mPreviousIndicator; 106 private Drawable mNextIndicator; 107 108 /** 109 * Used to inflate the Workspace from XML. 110 * 111 * @param context The application's context. 112 * @param attrs The attribtues set containing the Workspace's customization values. 113 */ 114 public Workspace(Context context, AttributeSet attrs) { 115 this(context, attrs, 0); 116 } 117 118 /** 119 * Used to inflate the Workspace from XML. 120 * 121 * @param context The application's context. 122 * @param attrs The attribtues set containing the Workspace's customization values. 123 * @param defStyle Unused. 124 */ 125 public Workspace(Context context, AttributeSet attrs, int defStyle) { 126 super(context, attrs, defStyle); 127 128 mWallpaperManager = WallpaperManager.getInstance(context); 129 130 TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.Workspace, defStyle, 0); 131 mDefaultScreen = a.getInt(R.styleable.Workspace_defaultScreen, 1); 132 a.recycle(); 133 134 setHapticFeedbackEnabled(false); 135 initWorkspace(); 136 } 137 138 /** 139 * Initializes various states for this workspace. 140 */ 141 private void initWorkspace() { 142 mScroller = new Scroller(getContext()); 143 mCurrentScreen = mDefaultScreen; 144 Launcher.setScreen(mCurrentScreen); 145 146 final ViewConfiguration configuration = ViewConfiguration.get(getContext()); 147 mTouchSlop = configuration.getScaledTouchSlop(); 148 mMaximumVelocity = configuration.getScaledMaximumFlingVelocity(); 149 } 150 151 @Override 152 public void addView(View child, int index, LayoutParams params) { 153 if (!(child instanceof CellLayout)) { 154 throw new IllegalArgumentException("A Workspace can only have CellLayout children."); 155 } 156 super.addView(child, index, params); 157 } 158 159 @Override 160 public void addView(View child) { 161 if (!(child instanceof CellLayout)) { 162 throw new IllegalArgumentException("A Workspace can only have CellLayout children."); 163 } 164 super.addView(child); 165 } 166 167 @Override 168 public void addView(View child, int index) { 169 if (!(child instanceof CellLayout)) { 170 throw new IllegalArgumentException("A Workspace can only have CellLayout children."); 171 } 172 super.addView(child, index); 173 } 174 175 @Override 176 public void addView(View child, int width, int height) { 177 if (!(child instanceof CellLayout)) { 178 throw new IllegalArgumentException("A Workspace can only have CellLayout children."); 179 } 180 super.addView(child, width, height); 181 } 182 183 @Override 184 public void addView(View child, LayoutParams params) { 185 if (!(child instanceof CellLayout)) { 186 throw new IllegalArgumentException("A Workspace can only have CellLayout children."); 187 } 188 super.addView(child, params); 189 } 190 191 /** 192 * @return The open folder on the current screen, or null if there is none 193 */ 194 Folder getOpenFolder() { 195 CellLayout currentScreen = (CellLayout) getChildAt(mCurrentScreen); 196 int count = currentScreen.getChildCount(); 197 for (int i = 0; i < count; i++) { 198 View child = currentScreen.getChildAt(i); 199 CellLayout.LayoutParams lp = (CellLayout.LayoutParams) child.getLayoutParams(); 200 if (lp.cellHSpan == 4 && lp.cellVSpan == 4 && child instanceof Folder) { 201 return (Folder) child; 202 } 203 } 204 return null; 205 } 206 207 ArrayList<Folder> getOpenFolders() { 208 final int screens = getChildCount(); 209 ArrayList<Folder> folders = new ArrayList<Folder>(screens); 210 211 for (int screen = 0; screen < screens; screen++) { 212 CellLayout currentScreen = (CellLayout) getChildAt(screen); 213 int count = currentScreen.getChildCount(); 214 for (int i = 0; i < count; i++) { 215 View child = currentScreen.getChildAt(i); 216 CellLayout.LayoutParams lp = (CellLayout.LayoutParams) child.getLayoutParams(); 217 if (lp.cellHSpan == 4 && lp.cellVSpan == 4 && child instanceof Folder) { 218 folders.add((Folder) child); 219 break; 220 } 221 } 222 } 223 224 return folders; 225 } 226 227 boolean isDefaultScreenShowing() { 228 return mCurrentScreen == mDefaultScreen; 229 } 230 231 /** 232 * Returns the index of the currently displayed screen. 233 * 234 * @return The index of the currently displayed screen. 235 */ 236 int getCurrentScreen() { 237 return mCurrentScreen; 238 } 239 240 /** 241 * Sets the current screen. 242 * 243 * @param currentScreen 244 */ 245 void setCurrentScreen(int currentScreen) { 246 clearVacantCache(); 247 mCurrentScreen = Math.max(0, Math.min(currentScreen, getChildCount() - 1)); 248 scrollTo(mCurrentScreen * getWidth(), 0); 249 invalidate(); 250 } 251 252 /** 253 * Adds the specified child in the current screen. The position and dimension of 254 * the child are defined by x, y, spanX and spanY. 255 * 256 * @param child The child to add in one of the workspace's screens. 257 * @param x The X position of the child in the screen's grid. 258 * @param y The Y position of the child in the screen's grid. 259 * @param spanX The number of cells spanned horizontally by the child. 260 * @param spanY The number of cells spanned vertically by the child. 261 */ 262 void addInCurrentScreen(View child, int x, int y, int spanX, int spanY) { 263 addInScreen(child, mCurrentScreen, x, y, spanX, spanY, false); 264 } 265 266 /** 267 * Adds the specified child in the current screen. The position and dimension of 268 * the child are defined by x, y, spanX and spanY. 269 * 270 * @param child The child to add in one of the workspace's screens. 271 * @param x The X position of the child in the screen's grid. 272 * @param y The Y position of the child in the screen's grid. 273 * @param spanX The number of cells spanned horizontally by the child. 274 * @param spanY The number of cells spanned vertically by the child. 275 * @param insert When true, the child is inserted at the beginning of the children list. 276 */ 277 void addInCurrentScreen(View child, int x, int y, int spanX, int spanY, boolean insert) { 278 addInScreen(child, mCurrentScreen, x, y, spanX, spanY, insert); 279 } 280 281 /** 282 * Adds the specified child in the specified screen. The position and dimension of 283 * the child are defined by x, y, spanX and spanY. 284 * 285 * @param child The child to add in one of the workspace's screens. 286 * @param screen The screen in which to add the child. 287 * @param x The X position of the child in the screen's grid. 288 * @param y The Y position of the child in the screen's grid. 289 * @param spanX The number of cells spanned horizontally by the child. 290 * @param spanY The number of cells spanned vertically by the child. 291 */ 292 void addInScreen(View child, int screen, int x, int y, int spanX, int spanY) { 293 addInScreen(child, screen, x, y, spanX, spanY, false); 294 } 295 296 /** 297 * Adds the specified child in the specified screen. The position and dimension of 298 * the child are defined by x, y, spanX and spanY. 299 * 300 * @param child The child to add in one of the workspace's screens. 301 * @param screen The screen in which to add the child. 302 * @param x The X position of the child in the screen's grid. 303 * @param y The Y position of the child in the screen's grid. 304 * @param spanX The number of cells spanned horizontally by the child. 305 * @param spanY The number of cells spanned vertically by the child. 306 * @param insert When true, the child is inserted at the beginning of the children list. 307 */ 308 void addInScreen(View child, int screen, int x, int y, int spanX, int spanY, boolean insert) { 309 if (screen < 0 || screen >= getChildCount()) { 310 throw new IllegalStateException("The screen must be >= 0 and < " + getChildCount()); 311 } 312 313 clearVacantCache(); 314 315 final CellLayout group = (CellLayout) getChildAt(screen); 316 CellLayout.LayoutParams lp = (CellLayout.LayoutParams) child.getLayoutParams(); 317 if (lp == null) { 318 lp = new CellLayout.LayoutParams(x, y, spanX, spanY); 319 } else { 320 lp.cellX = x; 321 lp.cellY = y; 322 lp.cellHSpan = spanX; 323 lp.cellVSpan = spanY; 324 } 325 group.addView(child, insert ? 0 : -1, lp); 326 if (!(child instanceof Folder)) { 327 child.setHapticFeedbackEnabled(false); 328 child.setOnLongClickListener(mLongClickListener); 329 } 330 if (child instanceof DropTarget) { 331 mDragController.addDropTarget((DropTarget)child); 332 } 333 } 334 335 void addWidget(View view, Widget widget) { 336 addInScreen(view, widget.screen, widget.cellX, widget.cellY, widget.spanX, 337 widget.spanY, false); 338 } 339 340 void addWidget(View view, Widget widget, boolean insert) { 341 addInScreen(view, widget.screen, widget.cellX, widget.cellY, widget.spanX, 342 widget.spanY, insert); 343 } 344 345 CellLayout.CellInfo findAllVacantCells(boolean[] occupied) { 346 CellLayout group = (CellLayout) getChildAt(mCurrentScreen); 347 if (group != null) { 348 return group.findAllVacantCells(occupied, null); 349 } 350 return null; 351 } 352 353 private void clearVacantCache() { 354 if (mVacantCache != null) { 355 mVacantCache.clearVacantCells(); 356 mVacantCache = null; 357 } 358 } 359 360 /** 361 * Registers the specified listener on each screen contained in this workspace. 362 * 363 * @param l The listener used to respond to long clicks. 364 */ 365 @Override 366 public void setOnLongClickListener(OnLongClickListener l) { 367 mLongClickListener = l; 368 final int count = getChildCount(); 369 for (int i = 0; i < count; i++) { 370 getChildAt(i).setOnLongClickListener(l); 371 } 372 } 373 374 private void updateWallpaperOffset() { 375 updateWallpaperOffset(getChildAt(getChildCount() - 1).getRight() - (mRight - mLeft)); 376 } 377 378 private void updateWallpaperOffset(int scrollRange) { 379 mWallpaperManager.setWallpaperOffsetSteps(1.0f / (getChildCount() - 1), 0 ); 380 mWallpaperManager.setWallpaperOffsets(getWindowToken(), mScrollX / (float) scrollRange, 0); 381 } 382 383 @Override 384 public void computeScroll() { 385 if (mScroller.computeScrollOffset()) { 386 mScrollX = mScroller.getCurrX(); 387 mScrollY = mScroller.getCurrY(); 388 updateWallpaperOffset(); 389 postInvalidate(); 390 } else if (mNextScreen != INVALID_SCREEN) { 391 mCurrentScreen = Math.max(0, Math.min(mNextScreen, getChildCount() - 1)); 392 mPreviousIndicator.setLevel(mCurrentScreen); 393 mNextIndicator.setLevel(mCurrentScreen); 394 Launcher.setScreen(mCurrentScreen); 395 mNextScreen = INVALID_SCREEN; 396 clearChildrenCache(); 397 } 398 } 399 400 @Override 401 protected void dispatchDraw(Canvas canvas) { 402 boolean restore = false; 403 int restoreCount = 0; 404 405 // ViewGroup.dispatchDraw() supports many features we don't need: 406 // clip to padding, layout animation, animation listener, disappearing 407 // children, etc. The following implementation attempts to fast-track 408 // the drawing dispatch by drawing only what we know needs to be drawn. 409 410 boolean fastDraw = mTouchState != TOUCH_STATE_SCROLLING && mNextScreen == INVALID_SCREEN; 411 // If we are not scrolling or flinging, draw only the current screen 412 if (fastDraw) { 413 drawChild(canvas, getChildAt(mCurrentScreen), getDrawingTime()); 414 } else { 415 final long drawingTime = getDrawingTime(); 416 // If we are flinging, draw only the current screen and the target screen 417 if (mNextScreen >= 0 && mNextScreen < getChildCount() && 418 Math.abs(mCurrentScreen - mNextScreen) == 1) { 419 drawChild(canvas, getChildAt(mCurrentScreen), drawingTime); 420 drawChild(canvas, getChildAt(mNextScreen), drawingTime); 421 } else { 422 // If we are scrolling, draw all of our children 423 final int count = getChildCount(); 424 for (int i = 0; i < count; i++) { 425 drawChild(canvas, getChildAt(i), drawingTime); 426 } 427 } 428 } 429 430 if (restore) { 431 canvas.restoreToCount(restoreCount); 432 } 433 } 434 435 protected void onAttachedToWindow() { 436 super.onAttachedToWindow(); 437 mDragController.setWindowToken(getWindowToken()); 438 } 439 440 @Override 441 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 442 super.onMeasure(widthMeasureSpec, heightMeasureSpec); 443 444 final int width = MeasureSpec.getSize(widthMeasureSpec); 445 final int widthMode = MeasureSpec.getMode(widthMeasureSpec); 446 if (widthMode != MeasureSpec.EXACTLY) { 447 throw new IllegalStateException("Workspace can only be used in EXACTLY mode."); 448 } 449 450 final int heightMode = MeasureSpec.getMode(heightMeasureSpec); 451 if (heightMode != MeasureSpec.EXACTLY) { 452 throw new IllegalStateException("Workspace can only be used in EXACTLY mode."); 453 } 454 455 // The children are given the same width and height as the workspace 456 final int count = getChildCount(); 457 for (int i = 0; i < count; i++) { 458 getChildAt(i).measure(widthMeasureSpec, heightMeasureSpec); 459 } 460 461 462 if (mFirstLayout) { 463 setHorizontalScrollBarEnabled(false); 464 scrollTo(mCurrentScreen * width, 0); 465 setHorizontalScrollBarEnabled(true); 466 updateWallpaperOffset(width * (getChildCount() - 1)); 467 mFirstLayout = false; 468 } 469 } 470 471 @Override 472 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 473 int childLeft = 0; 474 475 final int count = getChildCount(); 476 for (int i = 0; i < count; i++) { 477 final View child = getChildAt(i); 478 if (child.getVisibility() != View.GONE) { 479 final int childWidth = child.getMeasuredWidth(); 480 child.layout(childLeft, 0, childLeft + childWidth, child.getMeasuredHeight()); 481 childLeft += childWidth; 482 } 483 } 484 } 485 486 @Override 487 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 488 int screen = indexOfChild(child); 489 if (screen != mCurrentScreen || !mScroller.isFinished()) { 490 if (!mLauncher.isWorkspaceLocked()) { 491 snapToScreen(screen); 492 } 493 return true; 494 } 495 return false; 496 } 497 498 @Override 499 protected boolean onRequestFocusInDescendants(int direction, Rect previouslyFocusedRect) { 500 if (!mLauncher.isAllAppsVisible()) { 501 final Folder openFolder = getOpenFolder(); 502 if (openFolder != null) { 503 return openFolder.requestFocus(direction, previouslyFocusedRect); 504 } else { 505 int focusableScreen; 506 if (mNextScreen != INVALID_SCREEN) { 507 focusableScreen = mNextScreen; 508 } else { 509 focusableScreen = mCurrentScreen; 510 } 511 getChildAt(focusableScreen).requestFocus(direction, previouslyFocusedRect); 512 } 513 } 514 return false; 515 } 516 517 @Override 518 public boolean dispatchUnhandledMove(View focused, int direction) { 519 if (direction == View.FOCUS_LEFT) { 520 if (getCurrentScreen() > 0) { 521 snapToScreen(getCurrentScreen() - 1); 522 return true; 523 } 524 } else if (direction == View.FOCUS_RIGHT) { 525 if (getCurrentScreen() < getChildCount() - 1) { 526 snapToScreen(getCurrentScreen() + 1); 527 return true; 528 } 529 } 530 return super.dispatchUnhandledMove(focused, direction); 531 } 532 533 @Override 534 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 535 if (!mLauncher.isAllAppsVisible()) { 536 final Folder openFolder = getOpenFolder(); 537 if (openFolder == null) { 538 getChildAt(mCurrentScreen).addFocusables(views, direction); 539 if (direction == View.FOCUS_LEFT) { 540 if (mCurrentScreen > 0) { 541 getChildAt(mCurrentScreen - 1).addFocusables(views, direction); 542 } 543 } else if (direction == View.FOCUS_RIGHT){ 544 if (mCurrentScreen < getChildCount() - 1) { 545 getChildAt(mCurrentScreen + 1).addFocusables(views, direction); 546 } 547 } 548 } else { 549 openFolder.addFocusables(views, direction); 550 } 551 } 552 } 553 554 @Override 555 public boolean dispatchTouchEvent(MotionEvent ev) { 556 if (ev.getAction() == MotionEvent.ACTION_DOWN) { 557 if (mLauncher.isWorkspaceLocked() || mLauncher.isAllAppsVisible()) { 558 return false; 559 } 560 } 561 return super.dispatchTouchEvent(ev); 562 } 563 564 @Override 565 public boolean onInterceptTouchEvent(MotionEvent ev) { 566 final boolean workspaceLocked = mLauncher.isWorkspaceLocked(); 567 final boolean allAppsVisible = mLauncher.isAllAppsVisible(); 568 if (workspaceLocked || allAppsVisible) { 569 return false; // We don't want the events. Let them fall through to the all apps view. 570 } 571 572 /* 573 * This method JUST determines whether we want to intercept the motion. 574 * If we return true, onTouchEvent will be called and we do the actual 575 * scrolling there. 576 */ 577 578 /* 579 * Shortcut the most recurring case: the user is in the dragging 580 * state and he is moving his finger. We want to intercept this 581 * motion. 582 */ 583 final int action = ev.getAction(); 584 if ((action == MotionEvent.ACTION_MOVE) && (mTouchState != TOUCH_STATE_REST)) { 585 return true; 586 } 587 588 final float x = ev.getX(); 589 final float y = ev.getY(); 590 591 switch (action) { 592 case MotionEvent.ACTION_MOVE: 593 /* 594 * mIsBeingDragged == false, otherwise the shortcut would have caught it. Check 595 * whether the user has moved far enough from his original down touch. 596 */ 597 598 /* 599 * Locally do absolute value. mLastMotionX is set to the y value 600 * of the down event. 601 */ 602 final int xDiff = (int) Math.abs(x - mLastMotionX); 603 final int yDiff = (int) Math.abs(y - mLastMotionY); 604 605 final int touchSlop = mTouchSlop; 606 boolean xMoved = xDiff > touchSlop; 607 boolean yMoved = yDiff > touchSlop; 608 609 if (xMoved || yMoved) { 610 611 if (xMoved) { 612 // Scroll if the user moved far enough along the X axis 613 mTouchState = TOUCH_STATE_SCROLLING; 614 enableChildrenCache(mCurrentScreen - 1, mCurrentScreen + 1); 615 } 616 // Either way, cancel any pending longpress 617 if (mAllowLongPress) { 618 mAllowLongPress = false; 619 // Try canceling the long press. It could also have been scheduled 620 // by a distant descendant, so use the mAllowLongPress flag to block 621 // everything 622 final View currentScreen = getChildAt(mCurrentScreen); 623 currentScreen.cancelLongPress(); 624 } 625 } 626 break; 627 628 case MotionEvent.ACTION_DOWN: 629 // Remember location of down touch 630 mLastMotionX = x; 631 mLastMotionY = y; 632 mAllowLongPress = true; 633 634 /* 635 * If being flinged and user touches the screen, initiate drag; 636 * otherwise don't. mScroller.isFinished should be false when 637 * being flinged. 638 */ 639 mTouchState = mScroller.isFinished() ? TOUCH_STATE_REST : TOUCH_STATE_SCROLLING; 640 break; 641 642 case MotionEvent.ACTION_CANCEL: 643 case MotionEvent.ACTION_UP: 644 645 if (mTouchState != TOUCH_STATE_SCROLLING) { 646 647 final CellLayout currentScreen = (CellLayout)getChildAt(mCurrentScreen); 648 if (!currentScreen.lastDownOnOccupiedCell()) { 649 // Send a tap to the wallpaper if the last down was on empty space 650 mWallpaperManager.sendWallpaperCommand(getWindowToken(), 651 "android.wallpaper.tap", (int) ev.getX(), (int) ev.getY(), 0, null); 652 } 653 } 654 655 // Release the drag 656 clearChildrenCache(); 657 mTouchState = TOUCH_STATE_REST; 658 mAllowLongPress = false; 659 660 break; 661 } 662 663 /* 664 * The only time we want to intercept motion events is if we are in the 665 * drag mode. 666 */ 667 return mTouchState != TOUCH_STATE_REST; 668 } 669 670 /** 671 * If one of our descendant views decides that it could be focused now, only 672 * pass that along if it's on the current screen. 673 * 674 * This happens when live folders requery, and if they're off screen, they 675 * end up calling requestFocus, which pulls it on screen. 676 */ 677 @Override 678 public void focusableViewAvailable(View focused) { 679 View current = getChildAt(mCurrentScreen); 680 View v = focused; 681 while (true) { 682 if (v == current) { 683 super.focusableViewAvailable(focused); 684 return; 685 } 686 if (v == this) { 687 return; 688 } 689 ViewParent parent = v.getParent(); 690 if (parent instanceof View) { 691 v = (View)v.getParent(); 692 } else { 693 return; 694 } 695 } 696 } 697 698 void enableChildrenCache(int fromScreen, int toScreen) { 699 if (fromScreen > toScreen) { 700 fromScreen = toScreen; 701 toScreen = fromScreen; 702 } 703 704 final int count = getChildCount(); 705 706 fromScreen = Math.max(fromScreen, 0); 707 toScreen = Math.min(toScreen, count - 1); 708 709 for (int i = fromScreen; i <= toScreen; i++) { 710 final CellLayout layout = (CellLayout) getChildAt(i); 711 layout.setChildrenDrawnWithCacheEnabled(true); 712 layout.setChildrenDrawingCacheEnabled(true); 713 } 714 } 715 716 void clearChildrenCache() { 717 final int count = getChildCount(); 718 for (int i = 0; i < count; i++) { 719 final CellLayout layout = (CellLayout) getChildAt(i); 720 layout.setChildrenDrawnWithCacheEnabled(false); 721 } 722 } 723 724 @Override 725 public boolean onTouchEvent(MotionEvent ev) { 726 727 if (mLauncher.isWorkspaceLocked()) { 728 return false; // We don't want the events. Let them fall through to the all apps view. 729 } 730 if (mLauncher.isAllAppsVisible()) { 731 // Cancel any scrolling that is in progress. 732 if (!mScroller.isFinished()) { 733 mScroller.abortAnimation(); 734 } 735 snapToScreen(mCurrentScreen); 736 return false; // We don't want the events. Let them fall through to the all apps view. 737 } 738 739 if (mVelocityTracker == null) { 740 mVelocityTracker = VelocityTracker.obtain(); 741 } 742 mVelocityTracker.addMovement(ev); 743 744 final int action = ev.getAction(); 745 final float x = ev.getX(); 746 747 switch (action) { 748 case MotionEvent.ACTION_DOWN: 749 /* 750 * If being flinged and user touches, stop the fling. isFinished 751 * will be false if being flinged. 752 */ 753 if (!mScroller.isFinished()) { 754 mScroller.abortAnimation(); 755 } 756 757 // Remember where the motion event started 758 mLastMotionX = x; 759 break; 760 case MotionEvent.ACTION_MOVE: 761 if (mTouchState == TOUCH_STATE_SCROLLING) { 762 // Scroll to follow the motion event 763 final int deltaX = (int) (mLastMotionX - x); 764 mLastMotionX = x; 765 766 if (deltaX < 0) { 767 if (mScrollX > 0) { 768 scrollBy(Math.max(-mScrollX, deltaX), 0); 769 updateWallpaperOffset(); 770 } 771 } else if (deltaX > 0) { 772 final int availableToScroll = getChildAt(getChildCount() - 1).getRight() - 773 mScrollX - getWidth(); 774 if (availableToScroll > 0) { 775 scrollBy(Math.min(availableToScroll, deltaX), 0); 776 updateWallpaperOffset(); 777 } 778 } else { 779 awakenScrollBars(); 780 } 781 } 782 break; 783 case MotionEvent.ACTION_UP: 784 if (mTouchState == TOUCH_STATE_SCROLLING) { 785 final VelocityTracker velocityTracker = mVelocityTracker; 786 velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); 787 int velocityX = (int) velocityTracker.getXVelocity(); 788 789 if (velocityX > SNAP_VELOCITY && mCurrentScreen > 0) { 790 // Fling hard enough to move left 791 snapToScreen(mCurrentScreen - 1); 792 } else if (velocityX < -SNAP_VELOCITY && mCurrentScreen < getChildCount() - 1) { 793 // Fling hard enough to move right 794 snapToScreen(mCurrentScreen + 1); 795 } else { 796 snapToDestination(); 797 } 798 799 if (mVelocityTracker != null) { 800 mVelocityTracker.recycle(); 801 mVelocityTracker = null; 802 } 803 } 804 mTouchState = TOUCH_STATE_REST; 805 break; 806 case MotionEvent.ACTION_CANCEL: 807 mTouchState = TOUCH_STATE_REST; 808 } 809 810 return true; 811 } 812 813 private void snapToDestination() { 814 final int screenWidth = getWidth(); 815 final int whichScreen = (mScrollX + (screenWidth / 2)) / screenWidth; 816 817 snapToScreen(whichScreen); 818 } 819 820 void snapToScreen(int whichScreen) { 821 snapToScreen(whichScreen, true); 822 } 823 824 void snapToScreen(int whichScreen, boolean animate) { 825 //if (!mScroller.isFinished()) return; 826 827 whichScreen = Math.max(0, Math.min(whichScreen, getChildCount() - 1)); 828 829 clearVacantCache(); 830 enableChildrenCache(mCurrentScreen, whichScreen); 831 832 final int screenDelta = Math.abs(whichScreen - mCurrentScreen); 833 834 mNextScreen = whichScreen; 835 836 mPreviousIndicator.setLevel(mNextScreen); 837 mNextIndicator.setLevel(mNextScreen); 838 839 View focusedChild = getFocusedChild(); 840 if (focusedChild != null && screenDelta != 0 && focusedChild == getChildAt(mCurrentScreen)) { 841 focusedChild.clearFocus(); 842 } 843 844 final int newX = whichScreen * getWidth(); 845 final int delta = newX - mScrollX; 846 final int duration = screenDelta * 300; 847 awakenScrollBars(duration); 848 849 // 1ms is close to don't animate 850 if (!mScroller.isFinished()) mScroller.abortAnimation(); 851 mScroller.startScroll(mScrollX, 0, delta, 0, animate ? duration : 1); 852 invalidate(); 853 } 854 855 void startDrag(CellLayout.CellInfo cellInfo) { 856 View child = cellInfo.cell; 857 858 // Make sure the drag was started by a long press as opposed to a long click. 859 // Note that Search takes focus when clicked rather than entering touch mode 860 if (!child.isInTouchMode() && !(child instanceof Search)) { 861 return; 862 } 863 864 mDragInfo = cellInfo; 865 mDragInfo.screen = mCurrentScreen; 866 867 CellLayout current = ((CellLayout) getChildAt(mCurrentScreen)); 868 869 current.onDragChild(child); 870 mDragController.startDrag(child, this, child.getTag(), DragController.DRAG_ACTION_MOVE); 871 invalidate(); 872 } 873 874 @Override 875 protected Parcelable onSaveInstanceState() { 876 final SavedState state = new SavedState(super.onSaveInstanceState()); 877 state.currentScreen = mCurrentScreen; 878 return state; 879 } 880 881 @Override 882 protected void onRestoreInstanceState(Parcelable state) { 883 SavedState savedState = (SavedState) state; 884 super.onRestoreInstanceState(savedState.getSuperState()); 885 if (savedState.currentScreen != -1) { 886 mCurrentScreen = savedState.currentScreen; 887 Launcher.setScreen(mCurrentScreen); 888 } 889 } 890 891 void addApplicationShortcut(ApplicationInfo info, CellLayout.CellInfo cellInfo) { 892 addApplicationShortcut(info, cellInfo, false); 893 } 894 895 void addApplicationShortcut(ApplicationInfo info, CellLayout.CellInfo cellInfo, 896 boolean insertAtFirst) { 897 final CellLayout layout = (CellLayout) getChildAt(cellInfo.screen); 898 final int[] result = new int[2]; 899 900 layout.cellToPoint(cellInfo.cellX, cellInfo.cellY, result); 901 onDropExternal(result[0], result[1], info, layout, insertAtFirst); 902 } 903 904 public void onDrop(DragSource source, int x, int y, int xOffset, int yOffset, 905 DragView dragView, Object dragInfo) { 906 final CellLayout cellLayout = getCurrentDropLayout(); 907 if (source != this) { 908 onDropExternal(x - xOffset, y - yOffset, dragInfo, cellLayout); 909 } else { 910 // Move internally 911 if (mDragInfo != null) { 912 final View cell = mDragInfo.cell; 913 int index = mScroller.isFinished() ? mCurrentScreen : mNextScreen; 914 if (index != mDragInfo.screen) { 915 final CellLayout originalCellLayout = (CellLayout) getChildAt(mDragInfo.screen); 916 originalCellLayout.removeView(cell); 917 cellLayout.addView(cell); 918 } 919 mTargetCell = estimateDropCell(x - xOffset, y - yOffset, 920 mDragInfo.spanX, mDragInfo.spanY, cell, cellLayout, mTargetCell); 921 cellLayout.onDropChild(cell, mTargetCell); 922 923 final ItemInfo info = (ItemInfo) cell.getTag(); 924 CellLayout.LayoutParams lp = (CellLayout.LayoutParams) cell.getLayoutParams(); 925 LauncherModel.moveItemInDatabase(mLauncher, info, 926 LauncherSettings.Favorites.CONTAINER_DESKTOP, index, lp.cellX, lp.cellY); 927 } 928 } 929 } 930 931 public void onDragEnter(DragSource source, int x, int y, int xOffset, int yOffset, 932 DragView dragView, Object dragInfo) { 933 clearVacantCache(); 934 } 935 936 public void onDragOver(DragSource source, int x, int y, int xOffset, int yOffset, 937 DragView dragView, Object dragInfo) { 938 } 939 940 public void onDragExit(DragSource source, int x, int y, int xOffset, int yOffset, 941 DragView dragView, Object dragInfo) { 942 clearVacantCache(); 943 } 944 945 private void onDropExternal(int x, int y, Object dragInfo, CellLayout cellLayout) { 946 onDropExternal(x, y, dragInfo, cellLayout, false); 947 } 948 949 private void onDropExternal(int x, int y, Object dragInfo, CellLayout cellLayout, 950 boolean insertAtFirst) { 951 // Drag from somewhere else 952 ItemInfo info = (ItemInfo) dragInfo; 953 954 View view; 955 956 switch (info.itemType) { 957 case LauncherSettings.Favorites.ITEM_TYPE_APPLICATION: 958 case LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT: 959 if (info.container == NO_ID) { 960 // Came from all apps -- make a copy 961 info = new ApplicationInfo((ApplicationInfo) info); 962 } 963 view = mLauncher.createShortcut(R.layout.application, cellLayout, 964 (ApplicationInfo) info); 965 break; 966 case LauncherSettings.Favorites.ITEM_TYPE_USER_FOLDER: 967 view = FolderIcon.fromXml(R.layout.folder_icon, mLauncher, 968 (ViewGroup) getChildAt(mCurrentScreen), ((UserFolderInfo) info)); 969 break; 970 default: 971 throw new IllegalStateException("Unknown item type: " + info.itemType); 972 } 973 974 cellLayout.addView(view, insertAtFirst ? 0 : -1); 975 view.setHapticFeedbackEnabled(false); 976 view.setOnLongClickListener(mLongClickListener); 977 if (view instanceof DropTarget) { 978 mDragController.addDropTarget((DropTarget) view); 979 } 980 981 mTargetCell = estimateDropCell(x, y, 1, 1, view, cellLayout, mTargetCell); 982 cellLayout.onDropChild(view, mTargetCell); 983 CellLayout.LayoutParams lp = (CellLayout.LayoutParams) view.getLayoutParams(); 984 985 LauncherModel.addOrMoveItemInDatabase(mLauncher, info, 986 LauncherSettings.Favorites.CONTAINER_DESKTOP, mCurrentScreen, lp.cellX, lp.cellY); 987 } 988 989 /** 990 * Return the current {@link CellLayout}, correctly picking the destination 991 * screen while a scroll is in progress. 992 */ 993 private CellLayout getCurrentDropLayout() { 994 int index = mScroller.isFinished() ? mCurrentScreen : mNextScreen; 995 return (CellLayout) getChildAt(index); 996 } 997 998 /** 999 * {@inheritDoc} 1000 */ 1001 public boolean acceptDrop(DragSource source, int x, int y, 1002 int xOffset, int yOffset, DragView dragView, Object dragInfo) { 1003 final CellLayout layout = getCurrentDropLayout(); 1004 final CellLayout.CellInfo cellInfo = mDragInfo; 1005 final int spanX = cellInfo == null ? 1 : cellInfo.spanX; 1006 final int spanY = cellInfo == null ? 1 : cellInfo.spanY; 1007 1008 if (mVacantCache == null) { 1009 final View ignoreView = cellInfo == null ? null : cellInfo.cell; 1010 mVacantCache = layout.findAllVacantCells(null, ignoreView); 1011 } 1012 1013 return mVacantCache.findCellForSpan(mTempEstimate, spanX, spanY, false); 1014 } 1015 1016 /** 1017 * {@inheritDoc} 1018 */ 1019 public Rect estimateDropLocation(DragSource source, int x, int y, 1020 int xOffset, int yOffset, DragView dragView, Object dragInfo, Rect recycle) { 1021 final CellLayout layout = getCurrentDropLayout(); 1022 1023 final CellLayout.CellInfo cellInfo = mDragInfo; 1024 final int spanX = cellInfo == null ? 1 : cellInfo.spanX; 1025 final int spanY = cellInfo == null ? 1 : cellInfo.spanY; 1026 final View ignoreView = cellInfo == null ? null : cellInfo.cell; 1027 1028 final Rect location = recycle != null ? recycle : new Rect(); 1029 1030 // Find drop cell and convert into rectangle 1031 int[] dropCell = estimateDropCell(x - xOffset, y - yOffset, 1032 spanX, spanY, ignoreView, layout, mTempCell); 1033 1034 if (dropCell == null) { 1035 return null; 1036 } 1037 1038 layout.cellToPoint(dropCell[0], dropCell[1], mTempEstimate); 1039 location.left = mTempEstimate[0]; 1040 location.top = mTempEstimate[1]; 1041 1042 layout.cellToPoint(dropCell[0] + spanX, dropCell[1] + spanY, mTempEstimate); 1043 location.right = mTempEstimate[0]; 1044 location.bottom = mTempEstimate[1]; 1045 1046 return location; 1047 } 1048 1049 /** 1050 * Calculate the nearest cell where the given object would be dropped. 1051 */ 1052 private int[] estimateDropCell(int pixelX, int pixelY, 1053 int spanX, int spanY, View ignoreView, CellLayout layout, int[] recycle) { 1054 // Create vacant cell cache if none exists 1055 if (mVacantCache == null) { 1056 mVacantCache = layout.findAllVacantCells(null, ignoreView); 1057 } 1058 1059 // Find the best target drop location 1060 return layout.findNearestVacantArea(pixelX, pixelY, 1061 spanX, spanY, mVacantCache, recycle); 1062 } 1063 1064 void setLauncher(Launcher launcher) { 1065 mLauncher = launcher; 1066 } 1067 1068 public void setDragController(DragController dragController) { 1069 mDragController = dragController; 1070 } 1071 1072 public void onDropCompleted(View target, boolean success) { 1073 clearVacantCache(); 1074 1075 if (success){ 1076 if (target != this && mDragInfo != null) { 1077 final CellLayout cellLayout = (CellLayout) getChildAt(mDragInfo.screen); 1078 cellLayout.removeView(mDragInfo.cell); 1079 if (mDragInfo.cell instanceof DropTarget) { 1080 mDragController.removeDropTarget((DropTarget)mDragInfo.cell); 1081 } 1082 //final Object tag = mDragInfo.cell.getTag(); 1083 } 1084 } else { 1085 if (mDragInfo != null) { 1086 final CellLayout cellLayout = (CellLayout) getChildAt(mDragInfo.screen); 1087 cellLayout.onDropAborted(mDragInfo.cell); 1088 } 1089 } 1090 1091 mDragInfo = null; 1092 } 1093 1094 public void scrollLeft() { 1095 clearVacantCache(); 1096 if (mScroller.isFinished()) { 1097 if (mCurrentScreen > 0) snapToScreen(mCurrentScreen - 1); 1098 } else { 1099 if (mNextScreen > 0) snapToScreen(mNextScreen - 1); 1100 } 1101 } 1102 1103 public void scrollRight() { 1104 clearVacantCache(); 1105 if (mScroller.isFinished()) { 1106 if (mCurrentScreen < getChildCount() -1) snapToScreen(mCurrentScreen + 1); 1107 } else { 1108 if (mNextScreen < getChildCount() -1) snapToScreen(mNextScreen + 1); 1109 } 1110 } 1111 1112 public int getScreenForView(View v) { 1113 int result = -1; 1114 if (v != null) { 1115 ViewParent vp = v.getParent(); 1116 int count = getChildCount(); 1117 for (int i = 0; i < count; i++) { 1118 if (vp == getChildAt(i)) { 1119 return i; 1120 } 1121 } 1122 } 1123 return result; 1124 } 1125 1126 /** 1127 * Find a search widget on the given screen 1128 */ 1129 private Search findSearchWidget(CellLayout screen) { 1130 final int count = screen.getChildCount(); 1131 for (int i = 0; i < count; i++) { 1132 View v = screen.getChildAt(i); 1133 if (v instanceof Search) { 1134 return (Search) v; 1135 } 1136 } 1137 return null; 1138 } 1139 1140 /** 1141 * Gets the first search widget on the current screen, if there is one. 1142 * Returns <code>null</code> otherwise. 1143 */ 1144 public Search findSearchWidgetOnCurrentScreen() { 1145 CellLayout currentScreen = (CellLayout)getChildAt(mCurrentScreen); 1146 return findSearchWidget(currentScreen); 1147 } 1148 1149 public Folder getFolderForTag(Object tag) { 1150 int screenCount = getChildCount(); 1151 for (int screen = 0; screen < screenCount; screen++) { 1152 CellLayout currentScreen = ((CellLayout) getChildAt(screen)); 1153 int count = currentScreen.getChildCount(); 1154 for (int i = 0; i < count; i++) { 1155 View child = currentScreen.getChildAt(i); 1156 CellLayout.LayoutParams lp = (CellLayout.LayoutParams) child.getLayoutParams(); 1157 if (lp.cellHSpan == 4 && lp.cellVSpan == 4 && child instanceof Folder) { 1158 Folder f = (Folder) child; 1159 if (f.getInfo() == tag) { 1160 return f; 1161 } 1162 } 1163 } 1164 } 1165 return null; 1166 } 1167 1168 public View getViewForTag(Object tag) { 1169 int screenCount = getChildCount(); 1170 for (int screen = 0; screen < screenCount; screen++) { 1171 CellLayout currentScreen = ((CellLayout) getChildAt(screen)); 1172 int count = currentScreen.getChildCount(); 1173 for (int i = 0; i < count; i++) { 1174 View child = currentScreen.getChildAt(i); 1175 if (child.getTag() == tag) { 1176 return child; 1177 } 1178 } 1179 } 1180 return null; 1181 } 1182 1183 /** 1184 * @return True is long presses are still allowed for the current touch 1185 */ 1186 public boolean allowLongPress() { 1187 return mAllowLongPress; 1188 } 1189 1190 /** 1191 * Set true to allow long-press events to be triggered, usually checked by 1192 * {@link Launcher} to accept or block dpad-initiated long-presses. 1193 */ 1194 public void setAllowLongPress(boolean allowLongPress) { 1195 mAllowLongPress = allowLongPress; 1196 } 1197 1198 void removeShortcutsForPackage(String packageName) { 1199 final ArrayList<View> childrenToRemove = new ArrayList<View>(); 1200 final int count = getChildCount(); 1201 1202 for (int i = 0; i < count; i++) { 1203 final CellLayout layout = (CellLayout) getChildAt(i); 1204 int childCount = layout.getChildCount(); 1205 1206 childrenToRemove.clear(); 1207 1208 for (int j = 0; j < childCount; j++) { 1209 final View view = layout.getChildAt(j); 1210 Object tag = view.getTag(); 1211 1212 if (tag instanceof ApplicationInfo) { 1213 final ApplicationInfo info = (ApplicationInfo) tag; 1214 // We need to check for ACTION_MAIN otherwise getComponent() might 1215 // return null for some shortcuts (for instance, for shortcuts to 1216 // web pages.) 1217 final Intent intent = info.intent; 1218 final ComponentName name = intent.getComponent(); 1219 1220 if (Intent.ACTION_MAIN.equals(intent.getAction()) && 1221 name != null && packageName.equals(name.getPackageName())) { 1222 LauncherModel.deleteItemFromDatabase(mLauncher, info); 1223 childrenToRemove.add(view); 1224 } 1225 } else if (tag instanceof UserFolderInfo) { 1226 final UserFolderInfo info = (UserFolderInfo) tag; 1227 final ArrayList<ApplicationInfo> contents = info.contents; 1228 final ArrayList<ApplicationInfo> toRemove = new ArrayList<ApplicationInfo>(1); 1229 final int contentsCount = contents.size(); 1230 boolean removedFromFolder = false; 1231 1232 for (int k = 0; k < contentsCount; k++) { 1233 final ApplicationInfo appInfo = contents.get(k); 1234 final Intent intent = appInfo.intent; 1235 final ComponentName name = intent.getComponent(); 1236 1237 if (Intent.ACTION_MAIN.equals(intent.getAction()) && 1238 name != null && packageName.equals(name.getPackageName())) { 1239 toRemove.add(appInfo); 1240 LauncherModel.deleteItemFromDatabase(mLauncher, appInfo); 1241 removedFromFolder = true; 1242 } 1243 } 1244 1245 contents.removeAll(toRemove); 1246 if (removedFromFolder) { 1247 final Folder folder = getOpenFolder(); 1248 if (folder != null) folder.notifyDataSetChanged(); 1249 } 1250 } 1251 } 1252 1253 childCount = childrenToRemove.size(); 1254 for (int j = 0; j < childCount; j++) { 1255 View child = childrenToRemove.get(j); 1256 layout.removeViewInLayout(child); 1257 if (child instanceof DropTarget) { 1258 mDragController.removeDropTarget((DropTarget)child); 1259 } 1260 } 1261 1262 if (childCount > 0) { 1263 layout.requestLayout(); 1264 layout.invalidate(); 1265 } 1266 } 1267 } 1268 1269 void updateShortcutsForPackage(String packageName) { 1270 final PackageManager pm = mLauncher.getPackageManager(); 1271 1272 final int count = getChildCount(); 1273 for (int i = 0; i < count; i++) { 1274 final CellLayout layout = (CellLayout) getChildAt(i); 1275 int childCount = layout.getChildCount(); 1276 for (int j = 0; j < childCount; j++) { 1277 final View view = layout.getChildAt(j); 1278 Object tag = view.getTag(); 1279 if (tag instanceof ApplicationInfo) { 1280 ApplicationInfo info = (ApplicationInfo) tag; 1281 // We need to check for ACTION_MAIN otherwise getComponent() might 1282 // return null for some shortcuts (for instance, for shortcuts to 1283 // web pages.) 1284 final Intent intent = info.intent; 1285 final ComponentName name = intent.getComponent(); 1286 if (info.itemType == LauncherSettings.Favorites.ITEM_TYPE_APPLICATION && 1287 Intent.ACTION_MAIN.equals(intent.getAction()) && name != null && 1288 packageName.equals(name.getPackageName())) { 1289 1290 final Drawable icon = AppInfoCache.getIconDrawable(pm, info); 1291 if (icon != null && icon != info.icon) { 1292 info.icon.setCallback(null); 1293 info.icon = Utilities.createIconThumbnail(icon, mContext); 1294 info.filtered = true; 1295 ((TextView) view).setCompoundDrawablesWithIntrinsicBounds(null, 1296 info.icon, null, null); 1297 } 1298 } 1299 } 1300 } 1301 } 1302 } 1303 1304 void moveToDefaultScreen(boolean animate) { 1305 snapToScreen(mDefaultScreen, animate); 1306 getChildAt(mDefaultScreen).requestFocus(); 1307 } 1308 1309 void setIndicators(Drawable previous, Drawable next) { 1310 mPreviousIndicator = previous; 1311 mNextIndicator = next; 1312 previous.setLevel(mCurrentScreen); 1313 next.setLevel(mCurrentScreen); 1314 } 1315 1316 public static class SavedState extends BaseSavedState { 1317 int currentScreen = -1; 1318 1319 SavedState(Parcelable superState) { 1320 super(superState); 1321 } 1322 1323 private SavedState(Parcel in) { 1324 super(in); 1325 currentScreen = in.readInt(); 1326 } 1327 1328 @Override 1329 public void writeToParcel(Parcel out, int flags) { 1330 super.writeToParcel(out, flags); 1331 out.writeInt(currentScreen); 1332 } 1333 1334 public static final Parcelable.Creator<SavedState> CREATOR = 1335 new Parcelable.Creator<SavedState>() { 1336 public SavedState createFromParcel(Parcel in) { 1337 return new SavedState(in); 1338 } 1339 1340 public SavedState[] newArray(int size) { 1341 return new SavedState[size]; 1342 } 1343 }; 1344 } 1345} 1346