Workspace.java revision 33ed7b2f5a2456dc44dfe6e8f35a415c1495a87c
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.RectF; 27import android.graphics.Rect; 28import android.graphics.drawable.Drawable; 29import android.util.AttributeSet; 30import android.view.MotionEvent; 31import android.view.VelocityTracker; 32import android.view.View; 33import android.view.ViewConfiguration; 34import android.view.ViewGroup; 35import android.view.ViewParent; 36import android.widget.Scroller; 37import android.widget.TextView; 38import android.os.Parcelable; 39import android.os.Parcel; 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 private static final int INVALID_SCREEN = -1; 50 51 /** 52 * The velocity at which a fling gesture will cause us to snap to the next screen 53 */ 54 private static final int SNAP_VELOCITY = 1000; 55 56 private final WallpaperManager mWallpaperManager; 57 58 private int mDefaultScreen; 59 60 private boolean mFirstLayout = true; 61 62 private int mCurrentScreen; 63 private int mNextScreen = INVALID_SCREEN; 64 private Scroller mScroller; 65 private VelocityTracker mVelocityTracker; 66 67 /** 68 * CellInfo for the cell that is currently being dragged 69 */ 70 private CellLayout.CellInfo mDragInfo; 71 72 /** 73 * Target drop area calculated during last acceptDrop call. 74 */ 75 private int[] mTargetCell = null; 76 77 private float mLastMotionX; 78 private float mLastMotionY; 79 80 private final static int TOUCH_STATE_REST = 0; 81 private final static int TOUCH_STATE_SCROLLING = 1; 82 83 private int mTouchState = TOUCH_STATE_REST; 84 85 private OnLongClickListener mLongClickListener; 86 87 private Launcher mLauncher; 88 private DragController mDragController; 89 90 /** 91 * Cache of vacant cells, used during drag events and invalidated as needed. 92 */ 93 private CellLayout.CellInfo mVacantCache = null; 94 95 private int[] mTempCell = new int[2]; 96 private int[] mTempEstimate = new int[2]; 97 98 private boolean mAllowLongPress = true; 99 100 private int mTouchSlop; 101 private int mMaximumVelocity; 102 103 final Rect mDrawerBounds = new Rect(); 104 final Rect mClipBounds = new Rect(); 105 int mDrawerContentHeight; 106 int mDrawerContentWidth; 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 initWorkspace(); 135 } 136 137 /** 138 * Initializes various states for this workspace. 139 */ 140 private void initWorkspace() { 141 mScroller = new Scroller(getContext()); 142 mCurrentScreen = mDefaultScreen; 143 Launcher.setScreen(mCurrentScreen); 144 145 final ViewConfiguration configuration = ViewConfiguration.get(getContext()); 146 mTouchSlop = configuration.getScaledTouchSlop(); 147 mMaximumVelocity = configuration.getScaledMaximumFlingVelocity(); 148 } 149 150 @Override 151 public void addView(View child, int index, LayoutParams params) { 152 if (!(child instanceof CellLayout)) { 153 throw new IllegalArgumentException("A Workspace can only have CellLayout children."); 154 } 155 super.addView(child, index, params); 156 } 157 158 @Override 159 public void addView(View child) { 160 if (!(child instanceof CellLayout)) { 161 throw new IllegalArgumentException("A Workspace can only have CellLayout children."); 162 } 163 super.addView(child); 164 } 165 166 @Override 167 public void addView(View child, int index) { 168 if (!(child instanceof CellLayout)) { 169 throw new IllegalArgumentException("A Workspace can only have CellLayout children."); 170 } 171 super.addView(child, index); 172 } 173 174 @Override 175 public void addView(View child, int width, int height) { 176 if (!(child instanceof CellLayout)) { 177 throw new IllegalArgumentException("A Workspace can only have CellLayout children."); 178 } 179 super.addView(child, width, height); 180 } 181 182 @Override 183 public void addView(View child, LayoutParams params) { 184 if (!(child instanceof CellLayout)) { 185 throw new IllegalArgumentException("A Workspace can only have CellLayout children."); 186 } 187 super.addView(child, params); 188 } 189 190 /** 191 * @return The open folder on the current screen, or null if there is none 192 */ 193 Folder getOpenFolder() { 194 CellLayout currentScreen = (CellLayout) getChildAt(mCurrentScreen); 195 int count = currentScreen.getChildCount(); 196 for (int i = 0; i < count; i++) { 197 View child = currentScreen.getChildAt(i); 198 CellLayout.LayoutParams lp = (CellLayout.LayoutParams) child.getLayoutParams(); 199 if (lp.cellHSpan == 4 && lp.cellVSpan == 4 && child instanceof Folder) { 200 return (Folder) child; 201 } 202 } 203 return null; 204 } 205 206 ArrayList<Folder> getOpenFolders() { 207 final int screens = getChildCount(); 208 ArrayList<Folder> folders = new ArrayList<Folder>(screens); 209 210 for (int screen = 0; screen < screens; screen++) { 211 CellLayout currentScreen = (CellLayout) getChildAt(screen); 212 int count = currentScreen.getChildCount(); 213 for (int i = 0; i < count; i++) { 214 View child = currentScreen.getChildAt(i); 215 CellLayout.LayoutParams lp = (CellLayout.LayoutParams) child.getLayoutParams(); 216 if (lp.cellHSpan == 4 && lp.cellVSpan == 4 && child instanceof Folder) { 217 folders.add((Folder) child); 218 break; 219 } 220 } 221 } 222 223 return folders; 224 } 225 226 boolean isDefaultScreenShowing() { 227 return mCurrentScreen == mDefaultScreen; 228 } 229 230 /** 231 * Returns the index of the currently displayed screen. 232 * 233 * @return The index of the currently displayed screen. 234 */ 235 int getCurrentScreen() { 236 return mCurrentScreen; 237 } 238 239 /** 240 * Returns how many screens there are. 241 */ 242 int getScreenCount() { 243 return getChildCount(); 244 } 245 246 /** 247 * Computes a bounding rectangle for a range of cells 248 * 249 * @param cellX X coordinate of upper left corner expressed as a cell position 250 * @param cellY Y coordinate of upper left corner expressed as a cell position 251 * @param cellHSpan Width in cells 252 * @param cellVSpan Height in cells 253 * @param rect Rectnagle into which to put the results 254 */ 255 public void cellToRect(int cellX, int cellY, int cellHSpan, int cellVSpan, RectF rect) { 256 ((CellLayout)getChildAt(mCurrentScreen)).cellToRect(cellX, cellY, 257 cellHSpan, cellVSpan, rect); 258 } 259 260 /** 261 * Sets the current screen. 262 * 263 * @param currentScreen 264 */ 265 void setCurrentScreen(int currentScreen) { 266 clearVacantCache(); 267 mCurrentScreen = Math.max(0, Math.min(currentScreen, getChildCount() - 1)); 268 scrollTo(mCurrentScreen * getWidth(), 0); 269 invalidate(); 270 } 271 272 /** 273 * Adds the specified child in the current screen. The position and dimension of 274 * the child are defined by x, y, spanX and spanY. 275 * 276 * @param child The child to add in one of the workspace's screens. 277 * @param x The X position of the child in the screen's grid. 278 * @param y The Y position of the child in the screen's grid. 279 * @param spanX The number of cells spanned horizontally by the child. 280 * @param spanY The number of cells spanned vertically by the child. 281 */ 282 void addInCurrentScreen(View child, int x, int y, int spanX, int spanY) { 283 addInScreen(child, mCurrentScreen, x, y, spanX, spanY, false); 284 } 285 286 /** 287 * Adds the specified child in the current screen. The position and dimension of 288 * the child are defined by x, y, spanX and spanY. 289 * 290 * @param child The child to add in one of the workspace's screens. 291 * @param x The X position of the child in the screen's grid. 292 * @param y The Y position of the child in the screen's grid. 293 * @param spanX The number of cells spanned horizontally by the child. 294 * @param spanY The number of cells spanned vertically by the child. 295 * @param insert When true, the child is inserted at the beginning of the children list. 296 */ 297 void addInCurrentScreen(View child, int x, int y, int spanX, int spanY, boolean insert) { 298 addInScreen(child, mCurrentScreen, x, y, spanX, spanY, insert); 299 } 300 301 /** 302 * Adds the specified child in the specified screen. The position and dimension of 303 * the child are defined by x, y, spanX and spanY. 304 * 305 * @param child The child to add in one of the workspace's screens. 306 * @param screen The screen in which to add the child. 307 * @param x The X position of the child in the screen's grid. 308 * @param y The Y position of the child in the screen's grid. 309 * @param spanX The number of cells spanned horizontally by the child. 310 * @param spanY The number of cells spanned vertically by the child. 311 */ 312 void addInScreen(View child, int screen, int x, int y, int spanX, int spanY) { 313 addInScreen(child, screen, x, y, spanX, spanY, false); 314 } 315 316 /** 317 * Adds the specified child in the specified screen. The position and dimension of 318 * the child are defined by x, y, spanX and spanY. 319 * 320 * @param child The child to add in one of the workspace's screens. 321 * @param screen The screen in which to add the child. 322 * @param x The X position of the child in the screen's grid. 323 * @param y The Y position of the child in the screen's grid. 324 * @param spanX The number of cells spanned horizontally by the child. 325 * @param spanY The number of cells spanned vertically by the child. 326 * @param insert When true, the child is inserted at the beginning of the children list. 327 */ 328 void addInScreen(View child, int screen, int x, int y, int spanX, int spanY, boolean insert) { 329 if (screen < 0 || screen >= getChildCount()) { 330 throw new IllegalStateException("The screen must be >= 0 and < " + getChildCount()); 331 } 332 333 clearVacantCache(); 334 335 final CellLayout group = (CellLayout) getChildAt(screen); 336 CellLayout.LayoutParams lp = (CellLayout.LayoutParams) child.getLayoutParams(); 337 if (lp == null) { 338 lp = new CellLayout.LayoutParams(x, y, spanX, spanY); 339 } else { 340 lp.cellX = x; 341 lp.cellY = y; 342 lp.cellHSpan = spanX; 343 lp.cellVSpan = spanY; 344 } 345 group.addView(child, insert ? 0 : -1, lp); 346 if (!(child instanceof Folder)) { 347 child.setOnLongClickListener(mLongClickListener); 348 } 349 if (child instanceof DropTarget) { 350 mDragController.addDropTarget((DropTarget)child); 351 } 352 } 353 354 void addWidget(View view, Widget widget) { 355 addInScreen(view, widget.screen, widget.cellX, widget.cellY, widget.spanX, 356 widget.spanY, false); 357 } 358 359 void addWidget(View view, Widget widget, boolean insert) { 360 addInScreen(view, widget.screen, widget.cellX, widget.cellY, widget.spanX, 361 widget.spanY, insert); 362 } 363 364 CellLayout.CellInfo findAllVacantCells(boolean[] occupied) { 365 CellLayout group = (CellLayout) getChildAt(mCurrentScreen); 366 if (group != null) { 367 return group.findAllVacantCells(occupied, null); 368 } 369 return null; 370 } 371 372 private void clearVacantCache() { 373 if (mVacantCache != null) { 374 mVacantCache.clearVacantCells(); 375 mVacantCache = null; 376 } 377 } 378 379 /** 380 * Returns the coordinate of a vacant cell for the current screen. 381 */ 382 boolean getVacantCell(int[] vacant, int spanX, int spanY) { 383 CellLayout group = (CellLayout) getChildAt(mCurrentScreen); 384 if (group != null) { 385 return group.getVacantCell(vacant, spanX, spanY); 386 } 387 return false; 388 } 389 390 /** 391 * Adds the specified child in the current screen. The position and dimension of 392 * the child are defined by x, y, spanX and spanY. 393 * 394 * @param child The child to add in one of the workspace's screens. 395 * @param spanX The number of cells spanned horizontally by the child. 396 * @param spanY The number of cells spanned vertically by the child. 397 */ 398 void fitInCurrentScreen(View child, int spanX, int spanY) { 399 fitInScreen(child, mCurrentScreen, spanX, spanY); 400 } 401 402 /** 403 * Adds the specified child in the specified screen. The position and dimension of 404 * the child are defined by x, y, spanX and spanY. 405 * 406 * @param child The child to add in one of the workspace's screens. 407 * @param screen The screen in which to add the child. 408 * @param spanX The number of cells spanned horizontally by the child. 409 * @param spanY The number of cells spanned vertically by the child. 410 */ 411 void fitInScreen(View child, int screen, int spanX, int spanY) { 412 if (screen < 0 || screen >= getChildCount()) { 413 throw new IllegalStateException("The screen must be >= 0 and < " + getChildCount()); 414 } 415 416 final CellLayout group = (CellLayout) getChildAt(screen); 417 boolean vacant = group.getVacantCell(mTempCell, spanX, spanY); 418 if (vacant) { 419 group.addView(child, 420 new CellLayout.LayoutParams(mTempCell[0], mTempCell[1], spanX, spanY)); 421 child.setOnLongClickListener(mLongClickListener); 422 if (!(child instanceof Folder)) { 423 child.setOnLongClickListener(mLongClickListener); 424 } 425 if (child instanceof DropTarget) { 426 mDragController.addDropTarget((DropTarget)child); 427 } 428 } 429 } 430 431 /** 432 * Registers the specified listener on each screen contained in this workspace. 433 * 434 * @param l The listener used to respond to long clicks. 435 */ 436 @Override 437 public void setOnLongClickListener(OnLongClickListener l) { 438 mLongClickListener = l; 439 final int count = getChildCount(); 440 for (int i = 0; i < count; i++) { 441 getChildAt(i).setOnLongClickListener(l); 442 } 443 } 444 445 private void updateWallpaperOffset() { 446 updateWallpaperOffset(getChildAt(getChildCount() - 1).getRight() - (mRight - mLeft)); 447 } 448 449 private void updateWallpaperOffset(int scrollRange) { 450 mWallpaperManager.setWallpaperOffsets(getWindowToken(), mScrollX / (float) scrollRange, 0); 451 } 452 453 @Override 454 public void computeScroll() { 455 if (mScroller.computeScrollOffset()) { 456 mScrollX = mScroller.getCurrX(); 457 mScrollY = mScroller.getCurrY(); 458 updateWallpaperOffset(); 459 postInvalidate(); 460 } else if (mNextScreen != INVALID_SCREEN) { 461 mCurrentScreen = Math.max(0, Math.min(mNextScreen, getChildCount() - 1)); 462 Launcher.setScreen(mCurrentScreen); 463 mNextScreen = INVALID_SCREEN; 464 clearChildrenCache(); 465 } 466 } 467 468 @Override 469 protected void dispatchDraw(Canvas canvas) { 470 boolean restore = false; 471 int restoreCount = 0; 472 473 // For the fade. If view gets setAlpha(), use that instead. 474 float scale = mScale; 475 if (scale < 0.999f) { 476 int sx = mScrollX; 477 478 int alpha = (scale < 0.5f) ? (int)(255 * 2 * scale) : 255; 479 480 restoreCount = canvas.saveLayerAlpha(sx, 0, sx+getWidth(), getHeight(), alpha, 481 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 482 restore = true; 483 484 if (scale < 0.999f) { 485 int w = getWidth(); 486 w += 2 * mCurrentScreen * w; 487 int dx = w/2; 488 int h = getHeight(); 489 int dy = (h/2) - (h/4); 490 canvas.translate(dx, dy); 491 canvas.scale(scale, scale); 492 canvas.translate(-dx, -dy); 493 } 494 } 495 496 // ViewGroup.dispatchDraw() supports many features we don't need: 497 // clip to padding, layout animation, animation listener, disappearing 498 // children, etc. The following implementation attempts to fast-track 499 // the drawing dispatch by drawing only what we know needs to be drawn. 500 501 boolean fastDraw = mTouchState != TOUCH_STATE_SCROLLING && mNextScreen == INVALID_SCREEN 502 && scale > 0.999f; 503 // If we are not scrolling or flinging, draw only the current screen 504 if (fastDraw) { 505 drawChild(canvas, getChildAt(mCurrentScreen), getDrawingTime()); 506 } else { 507 final long drawingTime = getDrawingTime(); 508 // If we are flinging, draw only the current screen and the target screen 509 if (mNextScreen >= 0 && mNextScreen < getChildCount() && 510 Math.abs(mCurrentScreen - mNextScreen) == 1) { 511 drawChild(canvas, getChildAt(mCurrentScreen), drawingTime); 512 drawChild(canvas, getChildAt(mNextScreen), drawingTime); 513 } else { 514 // If we are scrolling, draw all of our children 515 final int count = getChildCount(); 516 for (int i = 0; i < count; i++) { 517 drawChild(canvas, getChildAt(i), drawingTime); 518 } 519 } 520 } 521 522 if (restore) { 523 canvas.restoreToCount(restoreCount); 524 } 525 } 526 527 private float mScale = 1.0f; 528 public void setScale(float scale) { 529 mScale = scale; 530 invalidate(); 531 } 532 533 protected void onAttachedToWindow() { 534 super.onAttachedToWindow(); 535 mDragController.setWindowToken(getWindowToken()); 536 } 537 538 @Override 539 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 540 super.onMeasure(widthMeasureSpec, heightMeasureSpec); 541 542 final int width = MeasureSpec.getSize(widthMeasureSpec); 543 final int widthMode = MeasureSpec.getMode(widthMeasureSpec); 544 if (widthMode != MeasureSpec.EXACTLY) { 545 throw new IllegalStateException("Workspace can only be used in EXACTLY mode."); 546 } 547 548 final int heightMode = MeasureSpec.getMode(heightMeasureSpec); 549 if (heightMode != MeasureSpec.EXACTLY) { 550 throw new IllegalStateException("Workspace can only be used in EXACTLY mode."); 551 } 552 553 // The children are given the same width and height as the workspace 554 final int count = getChildCount(); 555 for (int i = 0; i < count; i++) { 556 getChildAt(i).measure(widthMeasureSpec, heightMeasureSpec); 557 } 558 559 if (mFirstLayout) { 560 scrollTo(mCurrentScreen * width, 0); 561 updateWallpaperOffset(width * (getChildCount() - 1)); 562 mFirstLayout = false; 563 } 564 } 565 566 @Override 567 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 568 int childLeft = 0; 569 570 final int count = getChildCount(); 571 for (int i = 0; i < count; i++) { 572 final View child = getChildAt(i); 573 if (child.getVisibility() != View.GONE) { 574 final int childWidth = child.getMeasuredWidth(); 575 child.layout(childLeft, 0, childLeft + childWidth, child.getMeasuredHeight()); 576 childLeft += childWidth; 577 } 578 } 579 } 580 581 @Override 582 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 583 int screen = indexOfChild(child); 584 if (screen != mCurrentScreen || !mScroller.isFinished()) { 585 if (!mLauncher.isWorkspaceLocked()) { 586 snapToScreen(screen); 587 } 588 return true; 589 } 590 return false; 591 } 592 593 @Override 594 protected boolean onRequestFocusInDescendants(int direction, Rect previouslyFocusedRect) { 595 if (!mLauncher.isAllAppsVisible()) { 596 final Folder openFolder = getOpenFolder(); 597 if (openFolder != null) { 598 return openFolder.requestFocus(direction, previouslyFocusedRect); 599 } else { 600 int focusableScreen; 601 if (mNextScreen != INVALID_SCREEN) { 602 focusableScreen = mNextScreen; 603 } else { 604 focusableScreen = mCurrentScreen; 605 } 606 getChildAt(focusableScreen).requestFocus(direction, previouslyFocusedRect); 607 } 608 } 609 return false; 610 } 611 612 @Override 613 public boolean dispatchUnhandledMove(View focused, int direction) { 614 if (direction == View.FOCUS_LEFT) { 615 if (getCurrentScreen() > 0) { 616 snapToScreen(getCurrentScreen() - 1); 617 return true; 618 } 619 } else if (direction == View.FOCUS_RIGHT) { 620 if (getCurrentScreen() < getChildCount() - 1) { 621 snapToScreen(getCurrentScreen() + 1); 622 return true; 623 } 624 } 625 return super.dispatchUnhandledMove(focused, direction); 626 } 627 628 @Override 629 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 630 if (!mLauncher.isAllAppsVisible()) { 631 final Folder openFolder = getOpenFolder(); 632 if (openFolder == null) { 633 getChildAt(mCurrentScreen).addFocusables(views, direction); 634 if (direction == View.FOCUS_LEFT) { 635 if (mCurrentScreen > 0) { 636 getChildAt(mCurrentScreen - 1).addFocusables(views, direction); 637 } 638 } else if (direction == View.FOCUS_RIGHT){ 639 if (mCurrentScreen < getChildCount() - 1) { 640 getChildAt(mCurrentScreen + 1).addFocusables(views, direction); 641 } 642 } 643 } else { 644 openFolder.addFocusables(views, direction); 645 } 646 } 647 } 648 649 @Override 650 public boolean onInterceptTouchEvent(MotionEvent ev) { 651 if (mLauncher.isWorkspaceLocked() || mLauncher.isAllAppsVisible()) { 652 return false; // We don't want the events. Let them fall through to the all apps view. 653 } 654 655 /* 656 * This method JUST determines whether we want to intercept the motion. 657 * If we return true, onTouchEvent will be called and we do the actual 658 * scrolling there. 659 */ 660 661 /* 662 * Shortcut the most recurring case: the user is in the dragging 663 * state and he is moving his finger. We want to intercept this 664 * motion. 665 */ 666 final int action = ev.getAction(); 667 if ((action == MotionEvent.ACTION_MOVE) && (mTouchState != TOUCH_STATE_REST)) { 668 return true; 669 } 670 671 final float x = ev.getX(); 672 final float y = ev.getY(); 673 674 switch (action) { 675 case MotionEvent.ACTION_MOVE: 676 /* 677 * mIsBeingDragged == false, otherwise the shortcut would have caught it. Check 678 * whether the user has moved far enough from his original down touch. 679 */ 680 681 /* 682 * Locally do absolute value. mLastMotionX is set to the y value 683 * of the down event. 684 */ 685 final int xDiff = (int) Math.abs(x - mLastMotionX); 686 final int yDiff = (int) Math.abs(y - mLastMotionY); 687 688 final int touchSlop = mTouchSlop; 689 boolean xMoved = xDiff > touchSlop; 690 boolean yMoved = yDiff > touchSlop; 691 692 if (xMoved || yMoved) { 693 694 if (xMoved) { 695 // Scroll if the user moved far enough along the X axis 696 mTouchState = TOUCH_STATE_SCROLLING; 697 enableChildrenCache(); 698 } 699 // Either way, cancel any pending longpress 700 if (mAllowLongPress) { 701 mAllowLongPress = false; 702 // Try canceling the long press. It could also have been scheduled 703 // by a distant descendant, so use the mAllowLongPress flag to block 704 // everything 705 final View currentScreen = getChildAt(mCurrentScreen); 706 currentScreen.cancelLongPress(); 707 } 708 } 709 break; 710 711 case MotionEvent.ACTION_DOWN: 712 // Remember location of down touch 713 mLastMotionX = x; 714 mLastMotionY = y; 715 mAllowLongPress = true; 716 717 /* 718 * If being flinged and user touches the screen, initiate drag; 719 * otherwise don't. mScroller.isFinished should be false when 720 * being flinged. 721 */ 722 mTouchState = mScroller.isFinished() ? TOUCH_STATE_REST : TOUCH_STATE_SCROLLING; 723 break; 724 725 case MotionEvent.ACTION_CANCEL: 726 case MotionEvent.ACTION_UP: 727 // Release the drag 728 clearChildrenCache(); 729 mTouchState = TOUCH_STATE_REST; 730 mAllowLongPress = false; 731 break; 732 } 733 734 /* 735 * The only time we want to intercept motion events is if we are in the 736 * drag mode. 737 */ 738 return mTouchState != TOUCH_STATE_REST; 739 } 740 741 void enableChildrenCache() { 742 final int count = getChildCount(); 743 for (int i = 0; i < count; i++) { 744 final CellLayout layout = (CellLayout) getChildAt(i); 745 layout.setChildrenDrawnWithCacheEnabled(true); 746 layout.setChildrenDrawingCacheEnabled(true); 747 } 748 } 749 750 void clearChildrenCache() { 751 final int count = getChildCount(); 752 for (int i = 0; i < count; i++) { 753 final CellLayout layout = (CellLayout) getChildAt(i); 754 layout.setChildrenDrawnWithCacheEnabled(false); 755 } 756 } 757 758 @Override 759 public boolean onTouchEvent(MotionEvent ev) { 760 761 if (mLauncher.isWorkspaceLocked() || mLauncher.isAllAppsVisible()) { 762 return false; // We don't want the events. Let them fall through to the all apps view. 763 } 764 765 if (mVelocityTracker == null) { 766 mVelocityTracker = VelocityTracker.obtain(); 767 } 768 mVelocityTracker.addMovement(ev); 769 770 final int action = ev.getAction(); 771 final float x = ev.getX(); 772 773 switch (action) { 774 case MotionEvent.ACTION_DOWN: 775 /* 776 * If being flinged and user touches, stop the fling. isFinished 777 * will be false if being flinged. 778 */ 779 if (!mScroller.isFinished()) { 780 mScroller.abortAnimation(); 781 } 782 783 // Remember where the motion event started 784 mLastMotionX = x; 785 break; 786 case MotionEvent.ACTION_MOVE: 787 if (mTouchState == TOUCH_STATE_SCROLLING) { 788 // Scroll to follow the motion event 789 final int deltaX = (int) (mLastMotionX - x); 790 mLastMotionX = x; 791 792 if (deltaX < 0) { 793 if (mScrollX > 0) { 794 scrollBy(Math.max(-mScrollX, deltaX), 0); 795 updateWallpaperOffset(); 796 } 797 } else if (deltaX > 0) { 798 final int availableToScroll = getChildAt(getChildCount() - 1).getRight() - 799 mScrollX - getWidth(); 800 if (availableToScroll > 0) { 801 scrollBy(Math.min(availableToScroll, deltaX), 0); 802 updateWallpaperOffset(); 803 } 804 } 805 } 806 break; 807 case MotionEvent.ACTION_UP: 808 if (mTouchState == TOUCH_STATE_SCROLLING) { 809 final VelocityTracker velocityTracker = mVelocityTracker; 810 velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); 811 int velocityX = (int) velocityTracker.getXVelocity(); 812 813 if (velocityX > SNAP_VELOCITY && mCurrentScreen > 0) { 814 // Fling hard enough to move left 815 snapToScreen(mCurrentScreen - 1); 816 } else if (velocityX < -SNAP_VELOCITY && mCurrentScreen < getChildCount() - 1) { 817 // Fling hard enough to move right 818 snapToScreen(mCurrentScreen + 1); 819 } else { 820 snapToDestination(); 821 } 822 823 if (mVelocityTracker != null) { 824 mVelocityTracker.recycle(); 825 mVelocityTracker = null; 826 } 827 } 828 mTouchState = TOUCH_STATE_REST; 829 break; 830 case MotionEvent.ACTION_CANCEL: 831 mTouchState = TOUCH_STATE_REST; 832 } 833 834 return true; 835 } 836 837 private void snapToDestination() { 838 final int screenWidth = getWidth(); 839 final int whichScreen = (mScrollX + (screenWidth / 2)) / screenWidth; 840 841 snapToScreen(whichScreen); 842 } 843 844 void snapToScreen(int whichScreen) { 845 if (!mScroller.isFinished()) return; 846 847 clearVacantCache(); 848 enableChildrenCache(); 849 850 whichScreen = Math.max(0, Math.min(whichScreen, getChildCount() - 1)); 851 boolean changingScreens = whichScreen != mCurrentScreen; 852 853 mNextScreen = whichScreen; 854 855 View focusedChild = getFocusedChild(); 856 if (focusedChild != null && changingScreens && focusedChild == getChildAt(mCurrentScreen)) { 857 focusedChild.clearFocus(); 858 } 859 860 final int newX = whichScreen * getWidth(); 861 final int delta = newX - mScrollX; 862 mScroller.startScroll(mScrollX, 0, delta, 0, Math.abs(delta) * 2); 863 invalidate(); 864 } 865 866 void startDrag(CellLayout.CellInfo cellInfo) { 867 View child = cellInfo.cell; 868 869 // Make sure the drag was started by a long press as opposed to a long click. 870 // Note that Search takes focus when clicked rather than entering touch mode 871 if (!child.isInTouchMode() && !(child instanceof Search)) { 872 return; 873 } 874 875 mDragInfo = cellInfo; 876 mDragInfo.screen = mCurrentScreen; 877 878 CellLayout current = ((CellLayout) getChildAt(mCurrentScreen)); 879 880 current.onDragChild(child); 881 mDragController.startDrag(child, this, child.getTag(), DragController.DRAG_ACTION_MOVE); 882 invalidate(); 883 } 884 885 @Override 886 protected Parcelable onSaveInstanceState() { 887 final SavedState state = new SavedState(super.onSaveInstanceState()); 888 state.currentScreen = mCurrentScreen; 889 return state; 890 } 891 892 @Override 893 protected void onRestoreInstanceState(Parcelable state) { 894 SavedState savedState = (SavedState) state; 895 super.onRestoreInstanceState(savedState.getSuperState()); 896 if (savedState.currentScreen != -1) { 897 mCurrentScreen = savedState.currentScreen; 898 Launcher.setScreen(mCurrentScreen); 899 } 900 } 901 902 void addApplicationShortcut(ApplicationInfo info, CellLayout.CellInfo cellInfo) { 903 addApplicationShortcut(info, cellInfo, false); 904 } 905 906 void addApplicationShortcut(ApplicationInfo info, CellLayout.CellInfo cellInfo, 907 boolean insertAtFirst) { 908 final CellLayout layout = (CellLayout) getChildAt(cellInfo.screen); 909 final int[] result = new int[2]; 910 911 layout.cellToPoint(cellInfo.cellX, cellInfo.cellY, result); 912 onDropExternal(result[0], result[1], info, layout, insertAtFirst); 913 } 914 915 public void onDrop(DragSource source, int x, int y, int xOffset, int yOffset, 916 DragView dragView, Object dragInfo) { 917 final CellLayout cellLayout = getCurrentDropLayout(); 918 if (source != this) { 919 onDropExternal(x - xOffset, y - yOffset, dragInfo, cellLayout); 920 } else { 921 // Move internally 922 if (mDragInfo != null) { 923 final View cell = mDragInfo.cell; 924 int index = mScroller.isFinished() ? mCurrentScreen : mNextScreen; 925 if (index != mDragInfo.screen) { 926 final CellLayout originalCellLayout = (CellLayout) getChildAt(mDragInfo.screen); 927 originalCellLayout.removeView(cell); 928 cellLayout.addView(cell); 929 } 930 mTargetCell = estimateDropCell(x - xOffset, y - yOffset, 931 mDragInfo.spanX, mDragInfo.spanY, cell, cellLayout, mTargetCell); 932 cellLayout.onDropChild(cell, mTargetCell); 933 934 final ItemInfo info = (ItemInfo)cell.getTag(); 935 CellLayout.LayoutParams lp = (CellLayout.LayoutParams) cell.getLayoutParams(); 936 LauncherModel.moveItemInDatabase(mLauncher, info, 937 LauncherSettings.Favorites.CONTAINER_DESKTOP, index, lp.cellX, lp.cellY); 938 } 939 } 940 } 941 942 public void onDragEnter(DragSource source, int x, int y, int xOffset, int yOffset, 943 DragView dragView, Object dragInfo) { 944 clearVacantCache(); 945 } 946 947 public void onDragOver(DragSource source, int x, int y, int xOffset, int yOffset, 948 DragView dragView, Object dragInfo) { 949 } 950 951 public void onDragExit(DragSource source, int x, int y, int xOffset, int yOffset, 952 DragView dragView, Object dragInfo) { 953 clearVacantCache(); 954 } 955 956 private void onDropExternal(int x, int y, Object dragInfo, CellLayout cellLayout) { 957 onDropExternal(x, y, dragInfo, cellLayout, false); 958 } 959 960 private void onDropExternal(int x, int y, Object dragInfo, CellLayout cellLayout, 961 boolean insertAtFirst) { 962 // Drag from somewhere else 963 ItemInfo info = (ItemInfo) dragInfo; 964 965 View view; 966 967 switch (info.itemType) { 968 case LauncherSettings.Favorites.ITEM_TYPE_APPLICATION: 969 case LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT: 970 if (info.container == NO_ID) { 971 // Came from all apps -- make a copy 972 info = new ApplicationInfo((ApplicationInfo) info); 973 } 974 view = mLauncher.createShortcut(R.layout.application, cellLayout, 975 (ApplicationInfo) info); 976 break; 977 case LauncherSettings.Favorites.ITEM_TYPE_USER_FOLDER: 978 view = FolderIcon.fromXml(R.layout.folder_icon, mLauncher, 979 (ViewGroup) getChildAt(mCurrentScreen), ((UserFolderInfo) info)); 980 break; 981 default: 982 throw new IllegalStateException("Unknown item type: " + info.itemType); 983 } 984 985 cellLayout.addView(view, insertAtFirst ? 0 : -1); 986 view.setOnLongClickListener(mLongClickListener); 987 if (view instanceof DropTarget) { 988 mDragController.addDropTarget((DropTarget)view); 989 } 990 991 mTargetCell = estimateDropCell(x, y, 1, 1, view, cellLayout, mTargetCell); 992 cellLayout.onDropChild(view, mTargetCell); 993 CellLayout.LayoutParams lp = (CellLayout.LayoutParams) view.getLayoutParams(); 994 995 LauncherModel.addOrMoveItemInDatabase(mLauncher, info, 996 LauncherSettings.Favorites.CONTAINER_DESKTOP, mCurrentScreen, lp.cellX, lp.cellY); 997 } 998 999 /** 1000 * Return the current {@link CellLayout}, correctly picking the destination 1001 * screen while a scroll is in progress. 1002 */ 1003 private CellLayout getCurrentDropLayout() { 1004 int index = mScroller.isFinished() ? mCurrentScreen : mNextScreen; 1005 return (CellLayout) getChildAt(index); 1006 } 1007 1008 /** 1009 * {@inheritDoc} 1010 */ 1011 public boolean acceptDrop(DragSource source, int x, int y, 1012 int xOffset, int yOffset, DragView dragView, Object dragInfo) { 1013 final CellLayout layout = getCurrentDropLayout(); 1014 final CellLayout.CellInfo cellInfo = mDragInfo; 1015 final int spanX = cellInfo == null ? 1 : cellInfo.spanX; 1016 final int spanY = cellInfo == null ? 1 : cellInfo.spanY; 1017 1018 if (mVacantCache == null) { 1019 final View ignoreView = cellInfo == null ? null : cellInfo.cell; 1020 mVacantCache = layout.findAllVacantCells(null, ignoreView); 1021 } 1022 1023 return mVacantCache.findCellForSpan(mTempEstimate, spanX, spanY, false); 1024 } 1025 1026 /** 1027 * {@inheritDoc} 1028 */ 1029 public Rect estimateDropLocation(DragSource source, int x, int y, 1030 int xOffset, int yOffset, DragView dragView, Object dragInfo, Rect recycle) { 1031 final CellLayout layout = getCurrentDropLayout(); 1032 1033 final CellLayout.CellInfo cellInfo = mDragInfo; 1034 final int spanX = cellInfo == null ? 1 : cellInfo.spanX; 1035 final int spanY = cellInfo == null ? 1 : cellInfo.spanY; 1036 final View ignoreView = cellInfo == null ? null : cellInfo.cell; 1037 1038 final Rect location = recycle != null ? recycle : new Rect(); 1039 1040 // Find drop cell and convert into rectangle 1041 int[] dropCell = estimateDropCell(x - xOffset, y - yOffset, 1042 spanX, spanY, ignoreView, layout, mTempCell); 1043 1044 if (dropCell == null) { 1045 return null; 1046 } 1047 1048 layout.cellToPoint(dropCell[0], dropCell[1], mTempEstimate); 1049 location.left = mTempEstimate[0]; 1050 location.top = mTempEstimate[1]; 1051 1052 layout.cellToPoint(dropCell[0] + spanX, dropCell[1] + spanY, mTempEstimate); 1053 location.right = mTempEstimate[0]; 1054 location.bottom = mTempEstimate[1]; 1055 1056 return location; 1057 } 1058 1059 /** 1060 * Calculate the nearest cell where the given object would be dropped. 1061 */ 1062 private int[] estimateDropCell(int pixelX, int pixelY, 1063 int spanX, int spanY, View ignoreView, CellLayout layout, int[] recycle) { 1064 // Create vacant cell cache if none exists 1065 if (mVacantCache == null) { 1066 mVacantCache = layout.findAllVacantCells(null, ignoreView); 1067 } 1068 1069 // Find the best target drop location 1070 return layout.findNearestVacantArea(pixelX, pixelY, 1071 spanX, spanY, mVacantCache, recycle); 1072 } 1073 1074 void setLauncher(Launcher launcher) { 1075 mLauncher = launcher; 1076 } 1077 1078 public void setDragController(DragController dragController) { 1079 mDragController = dragController; 1080 } 1081 1082 public void onDropCompleted(View target, boolean success) { 1083 if (success){ 1084 if (target != this && mDragInfo != null) { 1085 final CellLayout cellLayout = (CellLayout) getChildAt(mDragInfo.screen); 1086 cellLayout.removeView(mDragInfo.cell); 1087 if (mDragInfo.cell instanceof DropTarget) { 1088 mDragController.removeDropTarget((DropTarget)mDragInfo.cell); 1089 } 1090 final Object tag = mDragInfo.cell.getTag(); 1091 } 1092 } else { 1093 if (mDragInfo != null) { 1094 final CellLayout cellLayout = (CellLayout) getChildAt(mDragInfo.screen); 1095 cellLayout.onDropAborted(mDragInfo.cell); 1096 } 1097 } 1098 1099 mDragInfo = null; 1100 } 1101 1102 public void scrollLeft() { 1103 clearVacantCache(); 1104 if (mNextScreen == INVALID_SCREEN && mCurrentScreen > 0 && mScroller.isFinished()) { 1105 snapToScreen(mCurrentScreen - 1); 1106 } 1107 } 1108 1109 public void scrollRight() { 1110 clearVacantCache(); 1111 if (mNextScreen == INVALID_SCREEN && mCurrentScreen < getChildCount() -1 && 1112 mScroller.isFinished()) { 1113 snapToScreen(mCurrentScreen + 1); 1114 } 1115 } 1116 1117 public int getScreenForView(View v) { 1118 int result = -1; 1119 if (v != null) { 1120 ViewParent vp = v.getParent(); 1121 int count = getChildCount(); 1122 for (int i = 0; i < count; i++) { 1123 if (vp == getChildAt(i)) { 1124 return i; 1125 } 1126 } 1127 } 1128 return result; 1129 } 1130 1131 /** 1132 * Find a search widget on the given screen 1133 */ 1134 private Search findSearchWidget(CellLayout screen) { 1135 final int count = screen.getChildCount(); 1136 for (int i = 0; i < count; i++) { 1137 View v = screen.getChildAt(i); 1138 if (v instanceof Search) { 1139 return (Search) v; 1140 } 1141 } 1142 return null; 1143 } 1144 1145 /** 1146 * Gets the first search widget on the current screen, if there is one. 1147 * Returns <code>null</code> otherwise. 1148 */ 1149 public Search findSearchWidgetOnCurrentScreen() { 1150 CellLayout currentScreen = (CellLayout)getChildAt(mCurrentScreen); 1151 return findSearchWidget(currentScreen); 1152 } 1153 1154 public Folder getFolderForTag(Object tag) { 1155 int screenCount = getChildCount(); 1156 for (int screen = 0; screen < screenCount; screen++) { 1157 CellLayout currentScreen = ((CellLayout) getChildAt(screen)); 1158 int count = currentScreen.getChildCount(); 1159 for (int i = 0; i < count; i++) { 1160 View child = currentScreen.getChildAt(i); 1161 CellLayout.LayoutParams lp = (CellLayout.LayoutParams) child.getLayoutParams(); 1162 if (lp.cellHSpan == 4 && lp.cellVSpan == 4 && child instanceof Folder) { 1163 Folder f = (Folder) child; 1164 if (f.getInfo() == tag) { 1165 return f; 1166 } 1167 } 1168 } 1169 } 1170 return null; 1171 } 1172 1173 public View getViewForTag(Object tag) { 1174 int screenCount = getChildCount(); 1175 for (int screen = 0; screen < screenCount; screen++) { 1176 CellLayout currentScreen = ((CellLayout) getChildAt(screen)); 1177 int count = currentScreen.getChildCount(); 1178 for (int i = 0; i < count; i++) { 1179 View child = currentScreen.getChildAt(i); 1180 if (child.getTag() == tag) { 1181 return child; 1182 } 1183 } 1184 } 1185 return null; 1186 } 1187 1188 /** 1189 * @return True is long presses are still allowed for the current touch 1190 */ 1191 public boolean allowLongPress() { 1192 return mAllowLongPress; 1193 } 1194 1195 /** 1196 * Set true to allow long-press events to be triggered, usually checked by 1197 * {@link Launcher} to accept or block dpad-initiated long-presses. 1198 */ 1199 public void setAllowLongPress(boolean allowLongPress) { 1200 mAllowLongPress = allowLongPress; 1201 } 1202 1203 void removeShortcutsForPackage(String packageName) { 1204 final ArrayList<View> childrenToRemove = new ArrayList<View>(); 1205 final int count = getChildCount(); 1206 1207 for (int i = 0; i < count; i++) { 1208 final CellLayout layout = (CellLayout) getChildAt(i); 1209 int childCount = layout.getChildCount(); 1210 1211 childrenToRemove.clear(); 1212 1213 for (int j = 0; j < childCount; j++) { 1214 final View view = layout.getChildAt(j); 1215 Object tag = view.getTag(); 1216 1217 if (tag instanceof ApplicationInfo) { 1218 final ApplicationInfo info = (ApplicationInfo) tag; 1219 // We need to check for ACTION_MAIN otherwise getComponent() might 1220 // return null for some shortcuts (for instance, for shortcuts to 1221 // web pages.) 1222 final Intent intent = info.intent; 1223 final ComponentName name = intent.getComponent(); 1224 1225 if (Intent.ACTION_MAIN.equals(intent.getAction()) && 1226 name != null && packageName.equals(name.getPackageName())) { 1227 LauncherModel.deleteItemFromDatabase(mLauncher, info); 1228 childrenToRemove.add(view); 1229 } 1230 } else if (tag instanceof UserFolderInfo) { 1231 final UserFolderInfo info = (UserFolderInfo) tag; 1232 final ArrayList<ApplicationInfo> contents = info.contents; 1233 final ArrayList<ApplicationInfo> toRemove = new ArrayList<ApplicationInfo>(1); 1234 final int contentsCount = contents.size(); 1235 boolean removedFromFolder = false; 1236 1237 for (int k = 0; k < contentsCount; k++) { 1238 final ApplicationInfo appInfo = contents.get(k); 1239 final Intent intent = appInfo.intent; 1240 final ComponentName name = intent.getComponent(); 1241 1242 if (Intent.ACTION_MAIN.equals(intent.getAction()) && 1243 name != null && packageName.equals(name.getPackageName())) { 1244 toRemove.add(appInfo); 1245 LauncherModel.deleteItemFromDatabase(mLauncher, appInfo); 1246 removedFromFolder = true; 1247 } 1248 } 1249 1250 contents.removeAll(toRemove); 1251 if (removedFromFolder) { 1252 final Folder folder = getOpenFolder(); 1253 if (folder != null) folder.notifyDataSetChanged(); 1254 } 1255 } 1256 } 1257 1258 childCount = childrenToRemove.size(); 1259 for (int j = 0; j < childCount; j++) { 1260 View child = childrenToRemove.get(j); 1261 layout.removeViewInLayout(child); 1262 if (child instanceof DropTarget) { 1263 mDragController.removeDropTarget((DropTarget)child); 1264 } 1265 } 1266 1267 if (childCount > 0) { 1268 layout.requestLayout(); 1269 layout.invalidate(); 1270 } 1271 } 1272 } 1273 1274 void updateShortcutsForPackage(String packageName) { 1275 final PackageManager pm = mLauncher.getPackageManager(); 1276 1277 final int count = getChildCount(); 1278 for (int i = 0; i < count; i++) { 1279 final CellLayout layout = (CellLayout) getChildAt(i); 1280 int childCount = layout.getChildCount(); 1281 for (int j = 0; j < childCount; j++) { 1282 final View view = layout.getChildAt(j); 1283 Object tag = view.getTag(); 1284 if (tag instanceof ApplicationInfo) { 1285 ApplicationInfo info = (ApplicationInfo) tag; 1286 // We need to check for ACTION_MAIN otherwise getComponent() might 1287 // return null for some shortcuts (for instance, for shortcuts to 1288 // web pages.) 1289 final Intent intent = info.intent; 1290 final ComponentName name = intent.getComponent(); 1291 if (info.itemType == LauncherSettings.Favorites.ITEM_TYPE_APPLICATION && 1292 Intent.ACTION_MAIN.equals(intent.getAction()) && name != null && 1293 packageName.equals(name.getPackageName())) { 1294 1295 final Drawable icon = AppInfoCache.getIconDrawable(pm, info); 1296 if (icon != null && icon != info.icon) { 1297 info.icon.setCallback(null); 1298 info.icon = Utilities.createIconThumbnail(icon, mContext); 1299 info.filtered = true; 1300 ((TextView) view).setCompoundDrawablesWithIntrinsicBounds(null, 1301 info.icon, null, null); 1302 } 1303 } 1304 } 1305 } 1306 } 1307 } 1308 1309 void moveToDefaultScreen() { 1310 snapToScreen(mDefaultScreen); 1311 getChildAt(mDefaultScreen).requestFocus(); 1312 } 1313 1314 public static class SavedState extends BaseSavedState { 1315 int currentScreen = -1; 1316 1317 SavedState(Parcelable superState) { 1318 super(superState); 1319 } 1320 1321 private SavedState(Parcel in) { 1322 super(in); 1323 currentScreen = in.readInt(); 1324 } 1325 1326 @Override 1327 public void writeToParcel(Parcel out, int flags) { 1328 super.writeToParcel(out, flags); 1329 out.writeInt(currentScreen); 1330 } 1331 1332 public static final Parcelable.Creator<SavedState> CREATOR = 1333 new Parcelable.Creator<SavedState>() { 1334 public SavedState createFromParcel(Parcel in) { 1335 return new SavedState(in); 1336 } 1337 1338 public SavedState[] newArray(int size) { 1339 return new SavedState[size]; 1340 } 1341 }; 1342 } 1343 1344 void show() { 1345 setVisibility(VISIBLE); 1346 } 1347 1348 void hide() { 1349 } 1350} 1351