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Diffstat (limited to 'src/com/android/launcher/Workspace.java')
-rw-r--r-- | src/com/android/launcher/Workspace.java | 1256 |
1 files changed, 1256 insertions, 0 deletions
diff --git a/src/com/android/launcher/Workspace.java b/src/com/android/launcher/Workspace.java new file mode 100644 index 000000000..d834b8fe0 --- /dev/null +++ b/src/com/android/launcher/Workspace.java @@ -0,0 +1,1256 @@ +/* + * Copyright (C) 2008 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package com.android.launcher; + +import android.content.Context; +import android.content.Intent; +import android.content.ComponentName; +import android.content.res.TypedArray; +import android.graphics.Bitmap; +import android.graphics.Canvas; +import android.graphics.Paint; +import android.graphics.RectF; +import android.graphics.Rect; +import android.util.AttributeSet; +import android.view.MotionEvent; +import android.view.VelocityTracker; +import android.view.View; +import android.view.ViewConfiguration; +import android.view.ViewGroup; +import android.view.ViewParent; +import android.widget.Scroller; +import android.os.Parcelable; +import android.os.Parcel; + +import java.util.ArrayList; + +/** + * The workspace is a wide area with a wallpaper and a finite number of screens. Each + * screen contains a number of icons, folders or widgets the user can interact with. + * A workspace is meant to be used with a fixed width only. + */ +public class Workspace extends ViewGroup implements DropTarget, DragSource, DragScroller { + private static final int INVALID_SCREEN = -1; + + /** + * The velocity at which a fling gesture will cause us to snap to the next screen + */ + private static final int SNAP_VELOCITY = 1000; + + private int mDefaultScreen; + + private Paint mPaint; + private Bitmap mWallpaper; + + private int mWallpaperWidth; + private int mWallpaperHeight; + private float mWallpaperOffset; + private boolean mWallpaperLoaded; + + private boolean mFirstLayout = true; + + private int mCurrentScreen; + private int mNextScreen = INVALID_SCREEN; + private Scroller mScroller; + private VelocityTracker mVelocityTracker; + + /** + * CellInfo for the cell that is currently being dragged + */ + private CellLayout.CellInfo mDragInfo; + + private float mLastMotionX; + private float mLastMotionY; + + private final static int TOUCH_STATE_REST = 0; + private final static int TOUCH_STATE_SCROLLING = 1; + + private int mTouchState = TOUCH_STATE_REST; + + private OnLongClickListener mLongClickListener; + + private Launcher mLauncher; + private DragController mDragger; + + private int[] mTempCell = new int[2]; + + private boolean mAllowLongPress; + private boolean mLocked; + + private int mTouchSlop; + + final Rect mDrawerBounds = new Rect(); + final Rect mClipBounds = new Rect(); + + /** + * Used to inflate the Workspace from XML. + * + * @param context The application's context. + * @param attrs The attribtues set containing the Workspace's customization values. + */ + public Workspace(Context context, AttributeSet attrs) { + this(context, attrs, 0); + } + + /** + * Used to inflate the Workspace from XML. + * + * @param context The application's context. + * @param attrs The attribtues set containing the Workspace's customization values. + * @param defStyle Unused. + */ + public Workspace(Context context, AttributeSet attrs, int defStyle) { + super(context, attrs, defStyle); + + TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.Workspace, defStyle, 0); + mDefaultScreen = a.getInt(R.styleable.Workspace_defaultScreen, 1); + a.recycle(); + + initWorkspace(); + } + + /** + * Initializes various states for this workspace. + */ + private void initWorkspace() { + mScroller = new Scroller(getContext()); + mCurrentScreen = mDefaultScreen; + Launcher.setScreen(mCurrentScreen); + + mPaint = new Paint(); + mPaint.setDither(false); + + mTouchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop(); + } + + /** + * Set the background's wallpaper. + */ + void loadWallpaper(Bitmap bitmap) { + mWallpaper = bitmap; + mWallpaperLoaded = true; + requestLayout(); + invalidate(); + } + + @Override + public void addView(View child, int index, LayoutParams params) { + if (!(child instanceof CellLayout)) { + throw new IllegalArgumentException("A Workspace can only have CellLayout children."); + } + super.addView(child, index, params); + } + + @Override + public void addView(View child) { + if (!(child instanceof CellLayout)) { + throw new IllegalArgumentException("A Workspace can only have CellLayout children."); + } + super.addView(child); + } + + @Override + public void addView(View child, int index) { + if (!(child instanceof CellLayout)) { + throw new IllegalArgumentException("A Workspace can only have CellLayout children."); + } + super.addView(child, index); + } + + @Override + public void addView(View child, int width, int height) { + if (!(child instanceof CellLayout)) { + throw new IllegalArgumentException("A Workspace can only have CellLayout children."); + } + super.addView(child, width, height); + } + + @Override + public void addView(View child, LayoutParams params) { + if (!(child instanceof CellLayout)) { + throw new IllegalArgumentException("A Workspace can only have CellLayout children."); + } + super.addView(child, params); + } + + /** + * @return The open folder on the current screen, or null if there is none + */ + Folder getOpenFolder() { + CellLayout currentScreen = (CellLayout) getChildAt(mCurrentScreen); + int count = currentScreen.getChildCount(); + for (int i = 0; i < count; i++) { + View child = currentScreen.getChildAt(i); + CellLayout.LayoutParams lp = (CellLayout.LayoutParams) child.getLayoutParams(); + if (lp.cellHSpan == 4 && lp.cellVSpan == 4 && child instanceof Folder) { + return (Folder) child; + } + } + return null; + } + + ArrayList<Folder> getOpenFolders() { + final int screens = getChildCount(); + ArrayList<Folder> folders = new ArrayList<Folder>(screens); + + for (int screen = 0; screen < screens; screen++) { + CellLayout currentScreen = (CellLayout) getChildAt(screen); + int count = currentScreen.getChildCount(); + for (int i = 0; i < count; i++) { + View child = currentScreen.getChildAt(i); + CellLayout.LayoutParams lp = (CellLayout.LayoutParams) child.getLayoutParams(); + if (lp.cellHSpan == 4 && lp.cellVSpan == 4 && child instanceof Folder) { + folders.add((Folder) child); + break; + } + } + } + + return folders; + } + + boolean isDefaultScreenShowing() { + return mCurrentScreen == mDefaultScreen; + } + + /** + * Returns the index of the currently displayed screen. + * + * @return The index of the currently displayed screen. + */ + int getCurrentScreen() { + return mCurrentScreen; + } + + /** + * Computes a bounding rectangle for a range of cells + * + * @param cellX X coordinate of upper left corner expressed as a cell position + * @param cellY Y coordinate of upper left corner expressed as a cell position + * @param cellHSpan Width in cells + * @param cellVSpan Height in cells + * @param rect Rectnagle into which to put the results + */ + public void cellToRect(int cellX, int cellY, int cellHSpan, int cellVSpan, RectF rect) { + ((CellLayout)getChildAt(mCurrentScreen)).cellToRect(cellX, cellY, + cellHSpan, cellVSpan, rect); + } + + /** + * Sets the current screen. + * + * @param currentScreen + */ + void setCurrentScreen(int currentScreen) { + mCurrentScreen = Math.max(0, Math.min(currentScreen, getChildCount() - 1)); + scrollTo(mCurrentScreen * getWidth(), 0); + invalidate(); + } + + /** + * Shows the default screen (defined by the firstScreen attribute in XML.) + */ + void showDefaultScreen() { + setCurrentScreen(mDefaultScreen); + } + + /** + * Adds the specified child in the current screen. The position and dimension of + * the child are defined by x, y, spanX and spanY. + * + * @param child The child to add in one of the workspace's screens. + * @param x The X position of the child in the screen's grid. + * @param y The Y position of the child in the screen's grid. + * @param spanX The number of cells spanned horizontally by the child. + * @param spanY The number of cells spanned vertically by the child. + */ + void addInCurrentScreen(View child, int x, int y, int spanX, int spanY) { + addInScreen(child, mCurrentScreen, x, y, spanX, spanY, false); + } + + /** + * Adds the specified child in the current screen. The position and dimension of + * the child are defined by x, y, spanX and spanY. + * + * @param child The child to add in one of the workspace's screens. + * @param x The X position of the child in the screen's grid. + * @param y The Y position of the child in the screen's grid. + * @param spanX The number of cells spanned horizontally by the child. + * @param spanY The number of cells spanned vertically by the child. + * @param insert When true, the child is inserted at the beginning of the children list. + */ + void addInCurrentScreen(View child, int x, int y, int spanX, int spanY, boolean insert) { + addInScreen(child, mCurrentScreen, x, y, spanX, spanY, insert); + } + + /** + * Adds the specified child in the specified screen. The position and dimension of + * the child are defined by x, y, spanX and spanY. + * + * @param child The child to add in one of the workspace's screens. + * @param screen The screen in which to add the child. + * @param x The X position of the child in the screen's grid. + * @param y The Y position of the child in the screen's grid. + * @param spanX The number of cells spanned horizontally by the child. + * @param spanY The number of cells spanned vertically by the child. + */ + void addInScreen(View child, int screen, int x, int y, int spanX, int spanY) { + addInScreen(child, screen, x, y, spanX, spanY, false); + } + + /** + * Adds the specified child in the specified screen. The position and dimension of + * the child are defined by x, y, spanX and spanY. + * + * @param child The child to add in one of the workspace's screens. + * @param screen The screen in which to add the child. + * @param x The X position of the child in the screen's grid. + * @param y The Y position of the child in the screen's grid. + * @param spanX The number of cells spanned horizontally by the child. + * @param spanY The number of cells spanned vertically by the child. + * @param insert When true, the child is inserted at the beginning of the children list. + */ + void addInScreen(View child, int screen, int x, int y, int spanX, int spanY, boolean insert) { + if (screen < 0 || screen >= getChildCount()) { + throw new IllegalStateException("The screen must be >= 0 and < " + getChildCount()); + } + + final CellLayout group = (CellLayout) getChildAt(screen); + CellLayout.LayoutParams lp = (CellLayout.LayoutParams) child.getLayoutParams(); + if (lp == null) { + lp = new CellLayout.LayoutParams(x, y, spanX, spanY); + } else { + lp.cellX = x; + lp.cellY = y; + lp.cellHSpan = spanX; + lp.cellVSpan = spanY; + } + group.addView(child, insert ? 0 : -1, lp); + if (!(child instanceof Folder)) { + child.setOnLongClickListener(mLongClickListener); + } + } + + void addWidget(View view, Widget widget) { + addInScreen(view, widget.screen, widget.cellX, widget.cellY, widget.spanX, + widget.spanY, false); + } + + void addWidget(View view, Widget widget, boolean insert) { + addInScreen(view, widget.screen, widget.cellX, widget.cellY, widget.spanX, + widget.spanY, insert); + } + + CellLayout.CellInfo findAllVacantCells(boolean[] occupied) { + CellLayout group = (CellLayout) getChildAt(mCurrentScreen); + if (group != null) { + return group.findAllVacantCells(occupied); + } + return null; + } + + /** + * Returns the coordinate of a vacant cell for the current screen. + */ + boolean getVacantCell(int[] vacant, int spanX, int spanY) { + CellLayout group = (CellLayout) getChildAt(mCurrentScreen); + if (group != null) { + return group.getVacantCell(vacant, spanX, spanY); + } + return false; + } + + /** + * Adds the specified child in the current screen. The position and dimension of + * the child are defined by x, y, spanX and spanY. + * + * @param child The child to add in one of the workspace's screens. + * @param spanX The number of cells spanned horizontally by the child. + * @param spanY The number of cells spanned vertically by the child. + */ + void fitInCurrentScreen(View child, int spanX, int spanY) { + fitInScreen(child, mCurrentScreen, spanX, spanY); + } + + /** + * Adds the specified child in the specified screen. The position and dimension of + * the child are defined by x, y, spanX and spanY. + * + * @param child The child to add in one of the workspace's screens. + * @param screen The screen in which to add the child. + * @param spanX The number of cells spanned horizontally by the child. + * @param spanY The number of cells spanned vertically by the child. + */ + void fitInScreen(View child, int screen, int spanX, int spanY) { + if (screen < 0 || screen >= getChildCount()) { + throw new IllegalStateException("The screen must be >= 0 and < " + getChildCount()); + } + + final CellLayout group = (CellLayout) getChildAt(screen); + boolean vacant = group.getVacantCell(mTempCell, spanX, spanY); + if (vacant) { + group.addView(child, + new CellLayout.LayoutParams(mTempCell[0], mTempCell[1], spanX, spanY)); + child.setOnLongClickListener(mLongClickListener); + if (!(child instanceof Folder)) { + child.setOnLongClickListener(mLongClickListener); + } + } + } + + /** + * Registers the specified listener on each screen contained in this workspace. + * + * @param l The listener used to respond to long clicks. + */ + @Override + public void setOnLongClickListener(OnLongClickListener l) { + mLongClickListener = l; + final int count = getChildCount(); + for (int i = 0; i < count; i++) { + getChildAt(i).setOnLongClickListener(l); + } + } + + @Override + public void computeScroll() { + if (mScroller.computeScrollOffset()) { + mScrollX = mScroller.getCurrX(); + mScrollY = mScroller.getCurrY(); + postInvalidate(); + } else if (mNextScreen != INVALID_SCREEN) { + mCurrentScreen = Math.max(0, Math.min(mNextScreen, getChildCount() - 1)); + Launcher.setScreen(mCurrentScreen); + mNextScreen = INVALID_SCREEN; + clearChildrenCache(); + } + } + + @Override + protected void dispatchDraw(Canvas canvas) { + // If the all apps drawer is open and the drawing region for the workspace + // is contained within the drawer's bounds, we skip the drawing. This requires + // the drawer to be fully opaque. + if (mLauncher.isDrawerUp()) { + final Rect clipBounds = mClipBounds; + canvas.getClipBounds(clipBounds); + clipBounds.offset(-mScrollX, -mScrollY); + if (mDrawerBounds.contains(clipBounds)) { + return; + } + } + + float x = mScrollX * mWallpaperOffset; + if (x + mWallpaperWidth < mRight - mLeft) { + x = mRight - mLeft - mWallpaperWidth; + } + + canvas.drawBitmap(mWallpaper, x, (mBottom - mTop - mWallpaperHeight) / 2, mPaint); + + // ViewGroup.dispatchDraw() supports many features we don't need: + // clip to padding, layout animation, animation listener, disappearing + // children, etc. The following implementation attempts to fast-track + // the drawing dispatch by drawing only what we know needs to be drawn. + + boolean fastDraw = mTouchState != TOUCH_STATE_SCROLLING && mNextScreen == INVALID_SCREEN; + // If we are not scrolling or flinging, draw only the current screen + if (fastDraw) { + drawChild(canvas, getChildAt(mCurrentScreen), getDrawingTime()); + } else { + final long drawingTime = getDrawingTime(); + // If we are flinging, draw only the current screen and the target screen + if (mNextScreen >= 0 && mNextScreen < getChildCount() && + Math.abs(mCurrentScreen - mNextScreen) == 1) { + drawChild(canvas, getChildAt(mCurrentScreen), drawingTime); + drawChild(canvas, getChildAt(mNextScreen), drawingTime); + } else { + // If we are scrolling, draw all of our children + final int count = getChildCount(); + for (int i = 0; i < count; i++) { + drawChild(canvas, getChildAt(i), drawingTime); + } + } + } + } + + @Override + protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { + super.onMeasure(widthMeasureSpec, heightMeasureSpec); + + final int width = MeasureSpec.getSize(widthMeasureSpec); + final int widthMode = MeasureSpec.getMode(widthMeasureSpec); + if (widthMode != MeasureSpec.EXACTLY) { + throw new IllegalStateException("Workspace can only be used in EXACTLY mode."); + } + + final int heightMode = MeasureSpec.getMode(heightMeasureSpec); + if (heightMode != MeasureSpec.EXACTLY) { + throw new IllegalStateException("Workspace can only be used in EXACTLY mode."); + } + + // The children are given the same width and height as the workspace + final int count = getChildCount(); + for (int i = 0; i < count; i++) { + getChildAt(i).measure(widthMeasureSpec, heightMeasureSpec); + } + + if (mWallpaperLoaded) { + mWallpaperLoaded = false; + mWallpaper = Utilities.centerToFit(mWallpaper, width, + MeasureSpec.getSize(heightMeasureSpec), getContext()); + mWallpaperWidth = mWallpaper.getWidth(); + mWallpaperHeight = mWallpaper.getHeight(); + } + + final int wallpaperWidth = mWallpaperWidth; + mWallpaperOffset = wallpaperWidth > width ? (count * width - wallpaperWidth) / + ((count - 1) * (float) width) : 1.0f; + + if (mFirstLayout) { + scrollTo(mCurrentScreen * width, 0); + mFirstLayout = false; + } + } + + @Override + protected void onLayout(boolean changed, int left, int top, int right, int bottom) { + int childLeft = 0; + + final int count = getChildCount(); + for (int i = 0; i < count; i++) { + final View child = getChildAt(i); + if (child.getVisibility() != View.GONE) { + final int childWidth = child.getMeasuredWidth(); + child.layout(childLeft, 0, childLeft + childWidth, child.getMeasuredHeight()); + childLeft += childWidth; + } + } + } + + @Override + public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { + int screen = indexOfChild(child); + if (screen != mCurrentScreen || !mScroller.isFinished()) { + if (!mLauncher.isWorkspaceLocked()) { + snapToScreen(screen); + } + return true; + } + return false; + } + + @Override + protected boolean onRequestFocusInDescendants(int direction, Rect previouslyFocusedRect) { + if (mLauncher.isDrawerDown()) { + final Folder openFolder = getOpenFolder(); + if (openFolder != null) { + return openFolder.requestFocus(direction, previouslyFocusedRect); + } else { + int focusableScreen; + if (mNextScreen != INVALID_SCREEN) { + focusableScreen = mNextScreen; + } else { + focusableScreen = mCurrentScreen; + } + getChildAt(focusableScreen).requestFocus(direction, previouslyFocusedRect); + } + } + return false; + } + + @Override + public boolean dispatchUnhandledMove(View focused, int direction) { + if (direction == View.FOCUS_LEFT) { + if (getCurrentScreen() > 0) { + snapToScreen(getCurrentScreen() - 1); + return true; + } + } else if (direction == View.FOCUS_RIGHT) { + if (getCurrentScreen() < getChildCount() - 1) { + snapToScreen(getCurrentScreen() + 1); + return true; + } + } + return super.dispatchUnhandledMove(focused, direction); + } + + @Override + public void addFocusables(ArrayList<View> views, int direction) { + if (mLauncher.isDrawerDown()) { + final Folder openFolder = getOpenFolder(); + if (openFolder == null) { + getChildAt(mCurrentScreen).addFocusables(views, direction); + if (direction == View.FOCUS_LEFT) { + if (mCurrentScreen > 0) { + getChildAt(mCurrentScreen - 1).addFocusables(views, direction); + } + } else if (direction == View.FOCUS_RIGHT){ + if (mCurrentScreen < getChildCount() - 1) { + getChildAt(mCurrentScreen + 1).addFocusables(views, direction); + } + } + } else { + openFolder.addFocusables(views, direction); + } + } + } + + @Override + public boolean onInterceptTouchEvent(MotionEvent ev) { + if (mLocked || !mLauncher.isDrawerDown()) { + return true; + } + + /* + * This method JUST determines whether we want to intercept the motion. + * If we return true, onTouchEvent will be called and we do the actual + * scrolling there. + */ + + /* + * Shortcut the most recurring case: the user is in the dragging + * state and he is moving his finger. We want to intercept this + * motion. + */ + final int action = ev.getAction(); + if ((action == MotionEvent.ACTION_MOVE) && (mTouchState != TOUCH_STATE_REST)) { + return true; + } + + final float x = ev.getX(); + final float y = ev.getY(); + + switch (action) { + case MotionEvent.ACTION_MOVE: + /* + * mIsBeingDragged == false, otherwise the shortcut would have caught it. Check + * whether the user has moved far enough from his original down touch. + */ + + /* + * Locally do absolute value. mLastMotionX is set to the y value + * of the down event. + */ + final int xDiff = (int) Math.abs(x - mLastMotionX); + final int yDiff = (int) Math.abs(y - mLastMotionY); + + final int touchSlop = mTouchSlop; + boolean xMoved = xDiff > touchSlop; + boolean yMoved = yDiff > touchSlop; + + if (xMoved || yMoved) { + + if (xMoved) { + // Scroll if the user moved far enough along the X axis + mTouchState = TOUCH_STATE_SCROLLING; + enableChildrenCache(); + } + // Either way, cancel any pending longpress + if (mAllowLongPress) { + mAllowLongPress = false; + // Try canceling the long press. It could also have been scheduled + // by a distant descendant, so use the mAllowLongPress flag to block + // everything + final View currentScreen = getChildAt(mCurrentScreen); + currentScreen.cancelLongPress(); + } + } + break; + + case MotionEvent.ACTION_DOWN: + // Remember location of down touch + mLastMotionX = x; + mLastMotionY = y; + mAllowLongPress = true; + + /* + * If being flinged and user touches the screen, initiate drag; + * otherwise don't. mScroller.isFinished should be false when + * being flinged. + */ + mTouchState = mScroller.isFinished() ? TOUCH_STATE_REST : TOUCH_STATE_SCROLLING; + break; + + case MotionEvent.ACTION_CANCEL: + case MotionEvent.ACTION_UP: + // Release the drag + clearChildrenCache(); + mTouchState = TOUCH_STATE_REST; + mAllowLongPress = false; + break; + } + + /* + * The only time we want to intercept motion events is if we are in the + * drag mode. + */ + return mTouchState != TOUCH_STATE_REST; + } + + void enableChildrenCache() { + final int count = getChildCount(); + for (int i = 0; i < count; i++) { + final CellLayout layout = (CellLayout) getChildAt(i); + layout.setChildrenDrawnWithCacheEnabled(true); + layout.setChildrenDrawingCacheEnabled(true); + } + } + + void clearChildrenCache() { + final int count = getChildCount(); + for (int i = 0; i < count; i++) { + final CellLayout layout = (CellLayout) getChildAt(i); + layout.setChildrenDrawnWithCacheEnabled(false); + } + } + + @Override + public boolean onTouchEvent(MotionEvent ev) { + if (mLocked || !mLauncher.isDrawerDown()) { + return true; + } + + if (mVelocityTracker == null) { + mVelocityTracker = VelocityTracker.obtain(); + } + mVelocityTracker.addMovement(ev); + + final int action = ev.getAction(); + final float x = ev.getX(); + + switch (action) { + case MotionEvent.ACTION_DOWN: + /* + * If being flinged and user touches, stop the fling. isFinished + * will be false if being flinged. + */ + if (!mScroller.isFinished()) { + mScroller.abortAnimation(); + } + + // Remember where the motion event started + mLastMotionX = x; + break; + case MotionEvent.ACTION_MOVE: + if (mTouchState == TOUCH_STATE_SCROLLING) { + // Scroll to follow the motion event + final int deltaX = (int) (mLastMotionX - x); + mLastMotionX = x; + + if (deltaX < 0) { + if (mScrollX > 0) { + scrollBy(Math.max(-mScrollX, deltaX), 0); + } + } else if (deltaX > 0) { + final int availableToScroll = getChildAt(getChildCount() - 1).getRight() - + mScrollX - getWidth(); + if (availableToScroll > 0) { + scrollBy(Math.min(availableToScroll, deltaX), 0); + } + } + } + break; + case MotionEvent.ACTION_UP: + if (mTouchState == TOUCH_STATE_SCROLLING) { + final VelocityTracker velocityTracker = mVelocityTracker; + velocityTracker.computeCurrentVelocity(1000); + int velocityX = (int) velocityTracker.getXVelocity(); + + if (velocityX > SNAP_VELOCITY && mCurrentScreen > 0) { + // Fling hard enough to move left + snapToScreen(mCurrentScreen - 1); + } else if (velocityX < -SNAP_VELOCITY && mCurrentScreen < getChildCount() - 1) { + // Fling hard enough to move right + snapToScreen(mCurrentScreen + 1); + } else { + snapToDestination(); + } + + if (mVelocityTracker != null) { + mVelocityTracker.recycle(); + mVelocityTracker = null; + } + } + mTouchState = TOUCH_STATE_REST; + break; + case MotionEvent.ACTION_CANCEL: + mTouchState = TOUCH_STATE_REST; + } + + return true; + } + + private void snapToDestination() { + final int screenWidth = getWidth(); + final int whichScreen = (mScrollX + (screenWidth / 2)) / screenWidth; + + snapToScreen(whichScreen); + } + + void snapToScreen(int whichScreen) { + enableChildrenCache(); + + whichScreen = Math.max(0, Math.min(whichScreen, getChildCount() - 1)); + boolean changingScreens = whichScreen != mCurrentScreen; + + mNextScreen = whichScreen; + + View focusedChild = getFocusedChild(); + if (focusedChild != null && changingScreens && focusedChild == getChildAt(mCurrentScreen)) { + focusedChild.clearFocus(); + } + + final int newX = whichScreen * getWidth(); + final int delta = newX - mScrollX; + mScroller.startScroll(mScrollX, 0, delta, 0, Math.abs(delta) * 2); + invalidate(); + } + + void startDrag(CellLayout.CellInfo cellInfo) { + View child = cellInfo.cell; + + // Make sure the drag was started by a long press as opposed to a long click. + // Note that Search takes focus when clicked rather than entering touch mode + if (!child.isInTouchMode() && !(child instanceof Search)) { + return; + } + + mDragInfo = cellInfo; + mDragInfo.screen = mCurrentScreen; + + CellLayout current = ((CellLayout) getChildAt(mCurrentScreen)); + + current.onDragChild(child); + mDragger.startDrag(child, this, child.getTag(), DragController.DRAG_ACTION_MOVE); + invalidate(); + } + + @Override + protected Parcelable onSaveInstanceState() { + final SavedState state = new SavedState(super.onSaveInstanceState()); + state.currentScreen = mCurrentScreen; + return state; + } + + @Override + protected void onRestoreInstanceState(Parcelable state) { + SavedState savedState = (SavedState) state; + super.onRestoreInstanceState(savedState.getSuperState()); + if (savedState.currentScreen != -1) { + mCurrentScreen = savedState.currentScreen; + Launcher.setScreen(mCurrentScreen); + } + } + + void addApplicationShortcut(ApplicationInfo info, CellLayout.CellInfo cellInfo) { + addApplicationShortcut(info, cellInfo, false); + } + + void addApplicationShortcut(ApplicationInfo info, CellLayout.CellInfo cellInfo, + boolean insertAtFirst) { + final CellLayout layout = (CellLayout) getChildAt(cellInfo.screen); + final int[] result = new int[2]; + + layout.cellToPoint(cellInfo.cellX, cellInfo.cellY, result); + onDropExternal(result[0], result[1], info, layout, insertAtFirst); + } + + public void onDrop(DragSource source, int x, int y, int xOffset, int yOffset, Object dragInfo) { + final CellLayout cellLayout = (CellLayout) getChildAt(mCurrentScreen); + if (source != this) { + onDropExternal(x - xOffset, y - yOffset, dragInfo, cellLayout); + } else { + // Move internally + if (mDragInfo != null) { + final View cell = mDragInfo.cell; + if (mCurrentScreen != mDragInfo.screen) { + final CellLayout originalCellLayout = (CellLayout) getChildAt(mDragInfo.screen); + originalCellLayout.removeView(cell); + cellLayout.addView(cell); + } + cellLayout.onDropChild(cell, x - xOffset, y - yOffset); + + final ItemInfo info = (ItemInfo)cell.getTag(); + CellLayout.LayoutParams lp = (CellLayout.LayoutParams) cell.getLayoutParams(); + LauncherModel.moveItemInDatabase(mLauncher, info, + LauncherSettings.Favorites.CONTAINER_DESKTOP, mCurrentScreen, lp.cellX, lp.cellY); + } + } + } + + public void onDragEnter(DragSource source, int x, int y, int xOffset, int yOffset, + Object dragInfo) { + } + + public void onDragOver(DragSource source, int x, int y, int xOffset, int yOffset, + Object dragInfo) { + } + + public void onDragExit(DragSource source, int x, int y, int xOffset, int yOffset, + Object dragInfo) { + } + + private void onDropExternal(int x, int y, Object dragInfo, CellLayout cellLayout) { + onDropExternal(x, y, dragInfo, cellLayout, false); + } + + private void onDropExternal(int x, int y, Object dragInfo, CellLayout cellLayout, + boolean insertAtFirst) { + // Drag from somewhere else + ItemInfo info = (ItemInfo) dragInfo; + + View view; + + switch (info.itemType) { + case LauncherSettings.Favorites.ITEM_TYPE_APPLICATION: + case LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT: + if (info.container == NO_ID) { + // Came from all apps -- make a copy + info = new ApplicationInfo((ApplicationInfo) info); + } + view = mLauncher.createShortcut(R.layout.application, cellLayout, + (ApplicationInfo) info); + break; + case LauncherSettings.Favorites.ITEM_TYPE_USER_FOLDER: + view = FolderIcon.fromXml(R.layout.folder_icon, mLauncher, + (ViewGroup) getChildAt(mCurrentScreen), ((UserFolderInfo) info)); + break; + default: + throw new IllegalStateException("Unknown item type: " + info.itemType); + } + + cellLayout.addView(view, insertAtFirst ? 0 : -1); + view.setOnLongClickListener(mLongClickListener); + cellLayout.onDropChild(view, x, y); + CellLayout.LayoutParams lp = (CellLayout.LayoutParams) view.getLayoutParams(); + + final LauncherModel model = Launcher.getModel(); + model.addDesktopItem(info); + LauncherModel.addOrMoveItemInDatabase(mLauncher, info, + LauncherSettings.Favorites.CONTAINER_DESKTOP, mCurrentScreen, lp.cellX, lp.cellY); + } + + public boolean acceptDrop(DragSource source, int x, int y, int xOffset, int yOffset, + Object dragInfo) { + + final CellLayout.CellInfo cellInfo = mDragInfo; + int cellHSpan = cellInfo == null ? 1 : cellInfo.spanX; + int cellVSpan = cellInfo == null ? 1 : cellInfo.spanY; + + return ((CellLayout) getChildAt(mCurrentScreen)).acceptChildDrop(x - xOffset, y - yOffset, + cellHSpan, cellVSpan, cellInfo == null ? null : cellInfo.cell); + } + + void setLauncher(Launcher launcher) { + mLauncher = launcher; + } + + public void setDragger(DragController dragger) { + mDragger = dragger; + } + + public void onDropCompleted(View target, boolean success) { + if (success){ + if (target != this && mDragInfo != null) { + final CellLayout cellLayout = (CellLayout) getChildAt(mDragInfo.screen); + cellLayout.removeView(mDragInfo.cell); + final Object tag = mDragInfo.cell.getTag(); + Launcher.getModel().removeDesktopItem((ItemInfo) tag); + } + } else { + if (mDragInfo != null) { + final CellLayout cellLayout = (CellLayout) getChildAt(mDragInfo.screen); + cellLayout.onDropAborted(mDragInfo.cell); + } + } + + mDragInfo = null; + } + + public void scrollLeft() { + if (mNextScreen == INVALID_SCREEN && mCurrentScreen > 0 && mScroller.isFinished()) { + snapToScreen(mCurrentScreen - 1); + } + } + + public void scrollRight() { + if (mNextScreen == INVALID_SCREEN && mCurrentScreen < getChildCount() -1 && + mScroller.isFinished()) { + snapToScreen(mCurrentScreen + 1); + } + } + + public int getScreenForView(View v) { + int result = -1; + if (v != null) { + ViewParent vp = v.getParent(); + int count = getChildCount(); + for (int i = 0; i < count; i++) { + if (vp == getChildAt(i)) { + return i; + } + } + } + return result; + } + + /** + * Find a search widget on the given screen + */ + private Search findSearchWidget(CellLayout screen) { + final int count = screen.getChildCount(); + for (int i = 0; i < count; i++) { + View v = screen.getChildAt(i); + if (v instanceof Search) { + return (Search) v; + } + } + return null; + } + + /** + * Focuses on the search widget on the specified screen, + * if there is one. Also clears the current search selection so we don't + */ + private boolean focusOnSearch(int screen) { + CellLayout currentScreen = (CellLayout) getChildAt(screen); + final Search searchWidget = findSearchWidget(currentScreen); + if (searchWidget != null) { + // This is necessary when focus on search is requested from the menu + // If the workspace was not in touch mode before the menu is invoked + // and the user clicks "Search" by touching the menu item, the following + // happens: + // + // - We request focus from touch on the search widget + // - The search widget gains focus + // - The window focus comes back to Home's window + // - The touch mode change is propagated to Home's window + // - The search widget is not focusable in touch mode and ViewRoot + // clears its focus + // + // Forcing focusable in touch mode ensures the search widget will + // keep the focus no matter what happens. + // + // Note: the search input field disables focusable in touch mode + // after the window gets the focus back, see SearchAutoCompleteTextView + final SearchAutoCompleteTextView input = searchWidget.getSearchInputField(); + input.setFocusableInTouchMode(true); + input.showKeyboardOnNextFocus(); + + if (isInTouchMode()) { + searchWidget.requestFocusFromTouch(); + } else { + searchWidget.requestFocus(); + } + searchWidget.clearQuery(); + return true; + } + return false; + } + + /** + * Snap to the nearest screen with a search widget and give it focus + * + * @return True if a search widget was found + */ + public boolean snapToSearch() { + // The screen we are searching + int current = mCurrentScreen; + + // first position scanned so far + int first = current; + + // last position scanned so far + int last = current; + + // True if we should move down on the next iteration + boolean next = false; + + // True when we have looked at the first item in the data + boolean hitFirst; + + // True when we have looked at the last item in the data + boolean hitLast; + + final int count = getChildCount(); + + while (true) { + if (focusOnSearch(current)) { + return true; + } + + hitLast = last == count - 1; + hitFirst = first == 0; + + if (hitLast && hitFirst) { + // Looked at everything + break; + } + + if (hitFirst || (next && !hitLast)) { + // Either we hit the top, or we are trying to move down + last++; + current = last; + // Try going up next time + next = false; + } else { + // Either we hit the bottom, or we are trying to move up + first--; + current = first; + // Try going down next time + next = true; + } + + } + return false; + } + + public Folder getFolderForTag(Object tag) { + int screenCount = getChildCount(); + for (int screen = 0; screen < screenCount; screen++) { + CellLayout currentScreen = ((CellLayout) getChildAt(screen)); + int count = currentScreen.getChildCount(); + for (int i = 0; i < count; i++) { + View child = currentScreen.getChildAt(i); + CellLayout.LayoutParams lp = (CellLayout.LayoutParams) child.getLayoutParams(); + if (lp.cellHSpan == 4 && lp.cellVSpan == 4 && child instanceof Folder) { + Folder f = (Folder) child; + if (f.getInfo() == tag) { + return f; + } + } + } + } + return null; + } + + public View getViewForTag(Object tag) { + int screenCount = getChildCount(); + for (int screen = 0; screen < screenCount; screen++) { + CellLayout currentScreen = ((CellLayout) getChildAt(screen)); + int count = currentScreen.getChildCount(); + for (int i = 0; i < count; i++) { + View child = currentScreen.getChildAt(i); + if (child.getTag() == tag) { + return child; + } + } + } + return null; + } + + /** + * Unlocks the SlidingDrawer so that touch events are processed. + * + * @see #lock() + */ + public void unlock() { + mLocked = false; + } + + /** + * Locks the SlidingDrawer so that touch events are ignores. + * + * @see #unlock() + */ + public void lock() { + mLocked = true; + } + + /** + * @return True is long presses are still allowed for the current touch + */ + public boolean allowLongPress() { + return mAllowLongPress; + } + + void removeShortcutsForPackage(String packageName) { + final ArrayList<View> childrenToRemove = new ArrayList<View>(); + final LauncherModel model = Launcher.getModel(); + final int count = getChildCount(); + for (int i = 0; i < count; i++) { + final CellLayout layout = (CellLayout) getChildAt(i); + int childCount = layout.getChildCount(); + childrenToRemove.clear(); + for (int j = 0; j < childCount; j++) { + final View view = layout.getChildAt(j); + Object tag = view.getTag(); + if (tag instanceof ApplicationInfo) { + ApplicationInfo info = (ApplicationInfo) tag; + // We need to check for ACTION_MAIN otherwise getComponent() might + // return null for some shortcuts (for instance, for shortcuts to + // web pages.) + final Intent intent = info.intent; + final ComponentName name = intent.getComponent(); + if (Intent.ACTION_MAIN.equals(intent.getAction()) && + name != null && packageName.equals(name.getPackageName())) { + model.removeDesktopItem(info); + LauncherModel.deleteItemFromDatabase(mLauncher, info); + childrenToRemove.add(view); + } + } + } + childCount = childrenToRemove.size(); + for (int j = 0; j < childCount; j++) { + layout.removeViewInLayout(childrenToRemove.get(j)); + } + if (childCount > 0) { + layout.requestLayout(); + layout.invalidate(); + } + } + } + + // TODO: remove gadgets when gadgetmanager tells us they're gone +// void removeGadgetsForProvider() { +// } + + void moveToDefaultScreen() { + snapToScreen(mDefaultScreen); + getChildAt(mDefaultScreen).requestFocus(); + } + + public static class SavedState extends BaseSavedState { + int currentScreen = -1; + + SavedState(Parcelable superState) { + super(superState); + } + + private SavedState(Parcel in) { + super(in); + currentScreen = in.readInt(); + } + + @Override + public void writeToParcel(Parcel out, int flags) { + super.writeToParcel(out, flags); + out.writeInt(currentScreen); + } + + public static final Parcelable.Creator<SavedState> CREATOR = + new Parcelable.Creator<SavedState>() { + public SavedState createFromParcel(Parcel in) { + return new SavedState(in); + } + + public SavedState[] newArray(int size) { + return new SavedState[size]; + } + }; + } +} |