/*
* 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.fruit.launcher;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Rect;
import android.graphics.RectF;
import android.os.IBinder;
import android.os.Handler;
import android.os.Vibrator;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.View;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.WindowManager;
import android.view.inputmethod.InputMethodManager;
import java.util.ArrayList;
/**
* Class for initiating a drag within a view or across multiple views.
*/
public class DragController {
private static final String TAG = "DragController";
private static final boolean DEBUG = false;
/** Indicates the drag is a move. */
public static int DRAG_ACTION_MOVE = 0;
/** Indicates the drag is a copy. */
public static int DRAG_ACTION_COPY = 1;
private static final int SCROLL_DELAY = 600;
private static final int SCROLL_ZONE = 30;
private static final int VIBRATE_DURATION = 35;
private static final boolean PROFILE_DRAWING_DURING_DRAG = false;
private static final int SCROLL_OUTSIDE_ZONE = 0;
private static final int SCROLL_WAITING_IN_ZONE = 1;
private static final int SCROLL_LEFT = 0;
private static final int SCROLL_RIGHT = 1;
private Context mContext;
private Handler mHandler;
private final Vibrator mVibrator ;
// temporaries to avoid gc thrash
private Rect mRectTemp = new Rect();
private final int[] mCoordinatesTemp = new int[2];
/** Whether or not we're dragging. */
private boolean mDragging;
/** X coordinate of the down event. */
private float mMotionDownX;
/** Y coordinate of the down event. */
private float mMotionDownY;
/** Info about the screen for clamping. */
private DisplayMetrics mDisplayMetrics = new DisplayMetrics();
/** Original view that is being dragged. */
private View mOriginator;
/** X offset from the upper-left corner of the cell to where we touched. */
private float mTouchOffsetX;
/** Y offset from the upper-left corner of the cell to where we touched. */
private float mTouchOffsetY;
/** Where the drag originated */
private DragSource mDragSource;
/** The data associated with the object being dragged */
private Object mDragInfo;
/** The view that moves around while you drag. */
private DragView mDragView;
/** Who can receive drop events */
private ArrayList<DropTarget> mDropTargets = new ArrayList<DropTarget>();
private DragListener mListener;
/** The window token used as the parent for the DragView. */
private IBinder mWindowToken;
/**
* The view that will be scrolled when dragging to the left and right edges
* of the screen.
*/
private View mScrollView;
private View mMoveTarget;
private DragScroller mDragScroller;
private int mScrollState = SCROLL_OUTSIDE_ZONE;
private ScrollRunnable mScrollRunnable = new ScrollRunnable();
private RectF mDeleteRegion;
private DropTarget mLastDropTarget;
private InputMethodManager mInputMethodManager;
/**
* Interface to receive notifications when a drag starts or stops
*/
interface DragListener {
/**
* A drag has begun
*
* @param source
* An object representing where the drag originated
* @param info
* The data associated with the object that is being dragged
* @param dragAction
* The drag action: either
* {@link DragController#DRAG_ACTION_MOVE} or
* {@link DragController#DRAG_ACTION_COPY}
*/
void onDragStart(DragSource source, Object info, int dragAction);
/**
* The drag has eneded
*/
void onDragEnd();
}
/**
* Used to create a new DragLayer from XML.
*
* @param context
* The application's context.
*/
public DragController(Context context) {
mContext = context;
mHandler = new Handler();
mVibrator = (Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE);
}
/**
* Starts a drag.
*
* @param v
* The view that is being dragged
* @param source
* An object representing where the drag originated
* @param dragInfo
* The data associated with the object that is being dragged
* @param dragAction
* The drag action: either {@link #DRAG_ACTION_MOVE} or
* {@link #DRAG_ACTION_COPY}
*/
public void startDrag(View v, DragSource source, Object dragInfo,
int dragAction) {
mOriginator = v;
Bitmap b = getViewBitmap(v);
if (b == null) {
// out of memory?
return;
}
int[] loc = mCoordinatesTemp;
v.getLocationOnScreen(loc);
int screenX = loc[0];
int screenY = loc[1];
startDrag(b, screenX, screenY, 0, 0, b.getWidth(), b.getHeight(),
source, dragInfo, dragAction);
b.recycle();
if (dragAction == DRAG_ACTION_MOVE) {
v.setVisibility(View.GONE);
}
}
/**
* Starts a drag.
*
* @param b
* The bitmap to display as the drag image. It will be re-scaled
* to the enlarged size.
* @param screenX
* The x position on screen of the left-top of the bitmap.
* @param screenY
* The y position on screen of the left-top of the bitmap.
* @param textureLeft
* The left edge of the region inside b to use.
* @param textureTop
* The top edge of the region inside b to use.
* @param textureWidth
* The width of the region inside b to use.
* @param textureHeight
* The height of the region inside b to use.
* @param source
* An object representing where the drag originated
* @param dragInfo
* The data associated with the object that is being dragged
* @param dragAction
* The drag action: either {@link #DRAG_ACTION_MOVE} or
* {@link #DRAG_ACTION_COPY}
*/
public void startDrag(Bitmap b, int screenX, int screenY, int textureLeft,
int textureTop, int textureWidth, int textureHeight,
DragSource source, Object dragInfo, int dragAction) {
if (PROFILE_DRAWING_DURING_DRAG) {
android.os.Debug.startMethodTracing("Launcher");
}
// Hide soft keyboard, if visible
if (mInputMethodManager == null) {
mInputMethodManager = (InputMethodManager) mContext
.getSystemService(Context.INPUT_METHOD_SERVICE);
}
mInputMethodManager.hideSoftInputFromWindow(mWindowToken, 0);
if (mListener != null) {
mListener.onDragStart(source, dragInfo, dragAction);
}
int registrationX = ((int) mMotionDownX) - screenX;
int registrationY = ((int) mMotionDownY) - screenY;
mTouchOffsetX = mMotionDownX - screenX;
mTouchOffsetY = mMotionDownY - screenY;
mDragging = true;
mDragSource = source;
mDragInfo = dragInfo;
mVibrator.vibrate(VIBRATE_DURATION);
DragView dragView = mDragView = new DragView(mContext, b,
registrationX, registrationY, textureLeft, textureTop,
textureWidth, textureHeight);
if (mDragView != null) {
mDragView.setmOriginalWidth(textureWidth);
mDragView.setmOriginalHeight(textureHeight);
dragView.setmOriginalWidth(textureWidth);
dragView.setmOriginalHeight(textureHeight);
}
dragView.show(mWindowToken, (int) mMotionDownX, (int) mMotionDownY);
}
/**
* Draw the view into a bitmap.
*/
private Bitmap getViewBitmap(View v) {
v.clearFocus();
v.setPressed(false);
boolean willNotCache = v.willNotCacheDrawing();
v.setWillNotCacheDrawing(false);
// Reset the drawing cache background color to fully transparent
// for the duration of this operation
int color = v.getDrawingCacheBackgroundColor();
v.setDrawingCacheBackgroundColor(0);
if (color != 0) {
v.destroyDrawingCache();
}
v.buildDrawingCache();
Bitmap cacheBitmap = v.getDrawingCache();
if (cacheBitmap == null) {
Log.e(TAG, "failed getViewBitmap(" + v + ")",
new RuntimeException());
return null;
}
Bitmap bitmap = Bitmap.createBitmap(cacheBitmap);
// Restore the view
v.destroyDrawingCache();
v.setWillNotCacheDrawing(willNotCache);
v.setDrawingCacheBackgroundColor(color);
return bitmap;
}
/**
* Call this from a drag source view like this:
*
* <pre>
* @Override
* public boolean dispatchKeyEvent(KeyEvent event) {
* return mDragController.dispatchKeyEvent(this, event)
* || super.dispatchKeyEvent(event);
* </pre>
*/
public boolean dispatchKeyEvent(KeyEvent event) {
return mDragging;
}
public boolean isDraging() {
return mDragging;
}
/**
* Stop dragging without dropping.
*/
public void cancelDrag() {
if (mDragging) {
final int[] coordinates = mCoordinatesTemp;
if (mLastDropTarget != null) {
mLastDropTarget.onDragExit(mDragSource, coordinates[0],
coordinates[1], (int) mTouchOffsetX,
(int) mTouchOffsetY, mDragView, mDragInfo);
}
mDragSource.onDropCompleted((View) mLastDropTarget, false);
}
endDrag();
}
private void endDrag() {
if (mDragging) {
mDragging = false;
if (mOriginator != null) {
mOriginator.setVisibility(View.VISIBLE);
}
if (mListener != null) {
mListener.onDragEnd();
}
if (mDragView != null) {
mDragView.remove();
mDragView = null;
}
}
}
/**
* Call this from a drag source view.
*/
public boolean onInterceptTouchEvent(MotionEvent ev) {
if (DEBUG) {
Log.d(Launcher.TAG, "DragController.onInterceptTouchEvent " + ev
+ " mDragging=" + mDragging);
}
final int action = ev.getAction();
if (action == MotionEvent.ACTION_DOWN) {
recordScreenSize();
}
final int screenX = clamp((int) ev.getRawX(), 0,
mDisplayMetrics.widthPixels);
final int screenY = clamp((int) ev.getRawY(), 0,
mDisplayMetrics.heightPixels);
switch (action) {
case MotionEvent.ACTION_MOVE:
break;
case MotionEvent.ACTION_DOWN:
// Remember location of down touch
mMotionDownX = screenX;
mMotionDownY = screenY;
mLastDropTarget = null;
break;
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
if (mDragging) {
drop(screenX, screenY);
}
endDrag();
break;
}
return mDragging;
}
/**
* Sets the view that should handle move events.
*/
void setMoveTarget(View view) {
mMoveTarget = view;
}
public boolean dispatchUnhandledMove(View focused, int direction) {
return mMoveTarget != null
&& mMoveTarget.dispatchUnhandledMove(focused, direction);
}
/**
* Call this from a drag source view.
*/
public boolean onTouchEvent(MotionEvent ev) {
View scrollView = mScrollView;
if (!mDragging) {
return false;
}
final int action = ev.getAction();
final int screenX = clamp((int) ev.getRawX(), 0,
mDisplayMetrics.widthPixels);
final int screenY = clamp((int) ev.getRawY(), 0,
mDisplayMetrics.heightPixels);
switch (action) {
case MotionEvent.ACTION_DOWN:
// Remember where the motion event started
mMotionDownX = screenX;
mMotionDownY = screenY;
if ((screenX < SCROLL_ZONE) || (screenY < Launcher.mScreenHeight-Workspace.workspaceBottom)
|| (screenX > scrollView.getWidth() - SCROLL_ZONE)) {
mScrollState = SCROLL_WAITING_IN_ZONE;
mHandler.postDelayed(mScrollRunnable, SCROLL_DELAY);
} else {
mScrollState = SCROLL_OUTSIDE_ZONE;
}
break;
case MotionEvent.ACTION_MOVE:
// Update the drag view. Don't use the clamped pos here so the
// dragging looks
// like it goes off screen a little, intead of bumping up against
// the edge.
mDragView.move((int) ev.getRawX(), (int) ev.getRawY());
// Drop on someone?
final int[] coordinates = mCoordinatesTemp;
DropTarget dropTarget = findDropTarget(screenX, screenY,
coordinates);
if (dropTarget != null) {
if (mLastDropTarget == dropTarget) {
dropTarget.onDragOver(mDragSource, coordinates[0],
coordinates[1], (int) mTouchOffsetX,
(int) mTouchOffsetY, mDragView, mDragInfo);
} else {
if (mLastDropTarget != null) {
mLastDropTarget.onDragExit(mDragSource, coordinates[0],
coordinates[1], (int) mTouchOffsetX,
(int) mTouchOffsetY, mDragView, mDragInfo);
}
dropTarget.onDragEnter(mDragSource, coordinates[0],
coordinates[1], (int) mTouchOffsetX,
(int) mTouchOffsetY, mDragView, mDragInfo);
}
} else {
if (mLastDropTarget != null) {
mLastDropTarget.onDragExit(mDragSource, coordinates[0],
coordinates[1], (int) mTouchOffsetX,
(int) mTouchOffsetY, mDragView, mDragInfo);
}
}
mLastDropTarget = dropTarget;
// Scroll, maybe, but not if we're in the delete region.
boolean inDeleteRegion = false;
if (mDeleteRegion != null) {
inDeleteRegion = mDeleteRegion.contains(screenX, screenY);
}
if (!inDeleteRegion && screenX < SCROLL_ZONE
&& (screenY < Launcher.mScreenHeight-Workspace.workspaceBottom)) {
if (mScrollState == SCROLL_OUTSIDE_ZONE) {
mScrollState = SCROLL_WAITING_IN_ZONE;
mScrollRunnable.setDirection(SCROLL_LEFT);
mHandler.postDelayed(mScrollRunnable, SCROLL_DELAY);
}
} else if (!inDeleteRegion
&& screenX > scrollView.getWidth() - SCROLL_ZONE
&& (screenY < Launcher.mScreenHeight-Workspace.workspaceBottom)) {
if (mScrollState == SCROLL_OUTSIDE_ZONE) {
mScrollState = SCROLL_WAITING_IN_ZONE;
mScrollRunnable.setDirection(SCROLL_RIGHT);
mHandler.postDelayed(mScrollRunnable, SCROLL_DELAY);
}
} else {
if (mScrollState == SCROLL_WAITING_IN_ZONE) {
mScrollState = SCROLL_OUTSIDE_ZONE;
mScrollRunnable.setDirection(SCROLL_RIGHT);
mHandler.removeCallbacks(mScrollRunnable);
}
}
break;
case MotionEvent.ACTION_UP:
mHandler.removeCallbacks(mScrollRunnable);
if (mDragging) {
drop(screenX, screenY);
}
endDrag();
break;
case MotionEvent.ACTION_CANCEL:
cancelDrag();
}
return true;
}
private boolean drop(float x, float y) {
// boolean flag = true;
final int[] coordinates = mCoordinatesTemp;
DropTarget dropTarget = findDropTarget((int) x, (int) y, coordinates);
if (dropTarget != null) {
dropTarget.onDragExit(mDragSource, coordinates[0], coordinates[1],
(int) mTouchOffsetX, (int) mTouchOffsetY, mDragView,
mDragInfo);
if (dropTarget.acceptDrop(mDragSource, coordinates[0],
coordinates[1], (int) mTouchOffsetX, (int) mTouchOffsetY,
mDragView, mDragInfo)) {
dropTarget.onDrop(mDragSource, coordinates[0], coordinates[1],
(int) mTouchOffsetX, (int) mTouchOffsetY, mDragView,
mDragInfo);
mDragSource.onDropCompleted((View) dropTarget,
mDragView.ismCallbackFlag()); // yfzhao
return true;
} else {
mDragSource.onDropCompleted((View) dropTarget, false);
return true;
}
}
return false;
}
private DropTarget findDropTarget(int x, int y, int[] dropCoordinates) {
final Rect r = mRectTemp;
final ArrayList<DropTarget> dropTargets = mDropTargets;
final int count = dropTargets.size();
for (int i = count - 1; i >= 0; i--) {
final DropTarget target = dropTargets.get(i);
target.getHitRect(r);
target.getLocationOnScreen(dropCoordinates);
r.offset(dropCoordinates[0] - target.getLeft(), dropCoordinates[1]
- target.getTop());
if (r.contains(x, y)) {
dropCoordinates[0] = x - dropCoordinates[0];
dropCoordinates[1] = y - dropCoordinates[1];
return target;
}
}
return null;
}
/**
* Get the screen size so we can clamp events to the screen size so even if
* you drag off the edge of the screen, we find something.
*/
private void recordScreenSize() {
((WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE))
.getDefaultDisplay().getMetrics(mDisplayMetrics);
}
/**
* Clamp val to be >= min and < max.
*/
private static int clamp(int val, int min, int max) {
if (val < min) {
return min;
} else if (val >= max) {
return max - 7;
} else {
return val;
}
}
public void setDragScoller(DragScroller scroller) {
mDragScroller = scroller;
}
public void setWindowToken(IBinder token) {
mWindowToken = token;
}
/**
* Sets the drag listner which will be notified when a drag starts or ends.
*/
public void setDragListener(DragListener l) {
mListener = l;
}
/**
* Remove a previously installed drag listener.
*/
public void removeDragListener(DragListener l) {
mListener = null;
}
/**
* Add a DropTarget to the list of potential places to receive drop events.
*/
public void addDropTarget(DropTarget target) {
mDropTargets.add(target);
}
/**
* Don't send drop events to <em>target</em> any more.
*/
public void removeDropTarget(DropTarget target) {
mDropTargets.remove(target);
}
/**
* Set which view scrolls for touch events near the edge of the screen.
*/
public void setScrollView(View v) {
mScrollView = v;
}
/**
* Specifies the delete region. We won't scroll on touch events over the
* delete region.
*
* @param region
* The rectangle in screen coordinates of the delete region.
*/
void setDeleteRegion(RectF region) {
mDeleteRegion = region;
}
private class ScrollRunnable implements Runnable {
private int mDirection;
ScrollRunnable() {
}
@Override
public void run() {
if (mDragScroller != null) {
if (mDirection == SCROLL_LEFT) {
mDragScroller.scrollLeft();
} else {
mDragScroller.scrollRight();
}
mScrollState = SCROLL_OUTSIDE_ZONE;
}
}
void setDirection(int direction) {
mDirection = direction;
}
}
}