/*
* Copyright (c) 2010 CommonsWare, LLC
* Portions 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.commonsware.cwac.tlv;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.PixelFormat;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.GestureDetector;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.AdapterView;
import android.widget.ImageView;
import com.timsu.astrid.R;
import com.todoroo.andlib.utility.AndroidUtilities;
import com.todoroo.astrid.ui.ErrorCatchingListView;
@SuppressWarnings("nls")
public class TouchListView extends ErrorCatchingListView {
private ImageView mDragView;
private View mOriginalView;
private WindowManager mWindowManager;
private WindowManager.LayoutParams mWindowParams;
private int mDragPos; // which item is being dragged
private int mFirstDragPos; // where was the dragged item originally
private int mDragPoint; // at what offset inside the item did the user grab it
private int mCoordOffset; // the difference between screen coordinates and coordinates in this view
private float mDragStartX, mDragCurrentX;
private long mDragStartTime;
private DragListener mDragListener;
private DropListener mDropListener;
private SwipeListener mSwipeListener;
private GrabberClickListener mClickListener;
private int mUpperBound;
private int mLowerBound;
private int mHeight;
private GestureDetector mGestureDetector;
public static final int FLING = 0;
public static final int SLIDE_RIGHT = 1;
public static final int SLIDE_LEFT = 2;
private int mRemoveMode = -1;
private final Rect mTempRect = new Rect();
private Bitmap mDragBitmap;
private final int mTouchSlop;
private int mItemHeightNormal=-1;
private int mItemHeightExpanded=-1;
private int grabberId=-1;
private int dragndropBackgroundColor=0x00000000;
private Thread longPressThread;
public TouchListView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public TouchListView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
if (attrs != null) {
TypedArray a = getContext().obtainStyledAttributes(attrs,
R.styleable.TouchListView, 0, 0);
mItemHeightNormal = a.getDimensionPixelSize(
R.styleable.TouchListView_normal_height, 0);
mItemHeightExpanded = a.getDimensionPixelSize(
R.styleable.TouchListView_expanded_height,
mItemHeightNormal);
grabberId = a.getResourceId(R.styleable.TouchListView_grabber, -1);
dragndropBackgroundColor = a.getColor(
R.styleable.TouchListView_dragndrop_background, 0x00000000);
mRemoveMode = a.getInt(R.styleable.TouchListView_remove_mode, -1);
a.recycle();
}
}
@Override
final public void addHeaderView (View v, Object data, boolean isSelectable) {
throw new RuntimeException("Headers are not supported with TouchListView");
}
@Override
final public void addHeaderView (View v) {
throw new RuntimeException("Headers are not supported with TouchListView");
}
@Override
final public void addFooterView (View v, Object data, boolean isSelectable) {
if (mRemoveMode == SLIDE_LEFT || mRemoveMode == SLIDE_RIGHT) {
throw new RuntimeException("Footers are not supported with TouchListView in conjunction with remove_mode");
}
}
@Override
final public void addFooterView (View v) {
if (mRemoveMode == SLIDE_LEFT || mRemoveMode == SLIDE_RIGHT) {
throw new RuntimeException("Footers are not supported with TouchListView in conjunction with remove_mode");
}
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
if (mDragListener != null || mDropListener != null) {
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
int x = (int) ev.getX();
int y = (int) ev.getY();
int itemnum = pointToPosition(x, y);
if (itemnum == AdapterView.INVALID_POSITION) {
break;
}
View item = (View) getChildAt(itemnum - getFirstVisiblePosition());
if (isDraggableRow(item)) {
mDragPoint = y - item.getTop();
mCoordOffset = ((int)ev.getRawY()) - y;
View dragger = item.findViewById(grabberId);
Rect r = mTempRect;
// dragger.getDrawingRect(r);
r.left=dragger.getLeft();
r.right=dragger.getRight();
r.top=dragger.getTop();
r.bottom=dragger.getBottom();
if ((r.left<x) && (x<r.right)) {
item.setDrawingCacheEnabled(true);
// Create a copy of the drawing cache so that it does not get recycled
// by the framework when the list tries to clean up memory
Bitmap bitmap = Bitmap.createBitmap(item.getDrawingCache());
item.setDrawingCacheEnabled(false);
Rect listBounds=new Rect();
getGlobalVisibleRect(listBounds, null);
startDragging(bitmap, listBounds.left, y);
mDragPos = itemnum;
mFirstDragPos = mDragPos;
mHeight = getHeight();
mDragStartX = ev.getX();
mDragStartTime = System.currentTimeMillis();
mOriginalView = item;
int touchSlop = mTouchSlop;
mUpperBound = Math.min(y - touchSlop, mHeight / 3);
mLowerBound = Math.max(y + touchSlop, mHeight * 2 /3);
return false;
}
mDragView = null;
}
break;
}
}
return super.onInterceptTouchEvent(ev);
}
protected boolean isDraggableRow(View view) {
return(view.findViewById(grabberId)!=null);
}
/*
* pointToPosition() doesn't consider invisible views, but we
* need to, so implement a slightly different version.
*/
private int myPointToPosition(int x, int y) {
Rect frame = mTempRect;
final int count = getChildCount();
for (int i = count - 1; i >= 0; i--) {
final View child = getChildAt(i);
child.getHitRect(frame);
if (frame.contains(x, y)) {
return getFirstVisiblePosition() + i;
}
}
return INVALID_POSITION;
}
private int getItemForPosition(int y) {
int adjustedy = y - mDragPoint - (mItemHeightNormal/2);
int pos = myPointToPosition(0, adjustedy);
if (pos >= 0) {
if (pos <= mFirstDragPos) {
pos += 1;
}
} else if (adjustedy < 0) {
pos = 0;
}
return pos;
}
private void adjustScrollBounds(int y) {
if (y >= mHeight / 3) {
mUpperBound = mHeight / 3;
}
if (y <= mHeight * 2 / 3) {
mLowerBound = mHeight * 2 / 3;
}
}
/*
* Restore size and visibility for all listitems
*/
private void unExpandViews(boolean deletion) {
for (int i = 0;; i++) {
View v = getChildAt(i);
if (v == null) {
if (deletion) {
// HACK force update of mItemCount
int position = getFirstVisiblePosition();
int y = getChildAt(0).getTop();
setAdapter(getAdapter());
setSelectionFromTop(position, y);
// end hack
}
layoutChildren(); // force children to be recreated where needed
v = getChildAt(i);
if (v == null) {
break;
}
}
if (isDraggableRow(v)) {
ViewGroup.LayoutParams params = v.getLayoutParams();
params.height = mItemHeightNormal;
v.setLayoutParams(params);
v.setVisibility(View.VISIBLE);
}
}
}
/* Adjust visibility and size to make it appear as though
* an item is being dragged around and other items are making
* room for it:
* If dropping the item would result in it still being in the
* same place, then make the dragged listitem's size normal,
* but make the item invisible.
* Otherwise, if the dragged listitem is still on screen, make
* it as small as possible and expand the item below the insert
* point.
* If the dragged item is not on screen, only expand the item
* below the current insertpoint.
*/
private void doExpansion() {
int childnum = mDragPos - getFirstVisiblePosition();
if (mDragPos > mFirstDragPos) {
childnum++;
}
View first = getChildAt(mFirstDragPos - getFirstVisiblePosition());
for (int i = 0;; i++) {
View vv = getChildAt(i);
if (vv == null) {
break;
}
int height = mItemHeightNormal;
int visibility = View.VISIBLE;
if (vv.equals(first)) {
// processing the item that is being dragged
if (mDragPos == mFirstDragPos) {
// hovering over the original location
visibility = View.INVISIBLE;
} else {
// not hovering over it
height = 1;
}
} else if (i == childnum) {
if (mDragPos < getCount() - 1) {
height = mItemHeightExpanded;
}
}
if (isDraggableRow(vv)) {
ViewGroup.LayoutParams params = vv.getLayoutParams();
params.height = height;
vv.setLayoutParams(params);
vv.setVisibility(visibility);
}
}
// Request re-layout since we changed the items layout
// and not doing this would cause bogus hitbox calculation
// in myPointToPosition
layoutChildren();
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
if (mGestureDetector != null) {
mGestureDetector.onTouchEvent(ev);
}
if ((mDragListener != null || mDropListener != null) && mDragView != null) {
int action = ev.getAction();
switch (action) {
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
Rect r = mTempRect;
mDragView.getDrawingRect(r);
stopDragging(ev);
if (mDragPos == mFirstDragPos && ev.getX() > mDragStartX + 20) {
if (mSwipeListener!= null) {
mSwipeListener.swipeRight(mFirstDragPos);
}
unExpandViews(true);
} else if (mDragPos == mFirstDragPos && ev.getX() < mDragStartX - 20) {
if (mSwipeListener!= null) {
mSwipeListener.swipeLeft(mFirstDragPos);
}
unExpandViews(true);
} else {
if (mDropListener != null && mDragPos >= 0 && mDragPos < getCount()) {
mDropListener.drop(mFirstDragPos, mDragPos);
}
unExpandViews(false);
}
break;
case MotionEvent.ACTION_DOWN:
case MotionEvent.ACTION_MOVE:
int x = (int) ev.getX();
int y = (int) ev.getY();
dragView(x, y);
int itemnum = getItemForPosition(y);
if (itemnum >= 0) {
if (action == MotionEvent.ACTION_DOWN || itemnum != mDragPos) {
if (mDragListener != null) {
mDragListener.drag(mDragPos, itemnum);
}
mDragPos = itemnum;
doExpansion();
}
int speed = 0;
adjustScrollBounds(y);
if (y > mLowerBound) {
// scroll the list up a bit
speed = y > (mHeight + mLowerBound) / 2 ? 16 : 4;
} else if (y < mUpperBound) {
// scroll the list down a bit
speed = y < mUpperBound / 2 ? -16 : -4;
}
if (speed != 0) {
int ref = pointToPosition(0, mHeight / 2);
if (ref == AdapterView.INVALID_POSITION) {
//we hit a divider or an invisible view, check somewhere else
ref = pointToPosition(0, mHeight / 2 + getDividerHeight() + 64);
}
View v = getChildAt(ref - getFirstVisiblePosition());
if (v!= null) {
int pos = v.getTop();
setSelectionFromTop(ref, pos - speed);
}
}
}
break;
}
return true;
}
return super.onTouchEvent(ev);
}
private void startDragging(Bitmap bm, int x, int y) {
stopDragging(null);
mWindowParams = new WindowManager.LayoutParams();
mWindowParams.gravity = Gravity.TOP|Gravity.LEFT;
mWindowParams.x = x;
mWindowParams.y = y - mDragPoint + mCoordOffset;
mWindowParams.height = WindowManager.LayoutParams.WRAP_CONTENT;
mWindowParams.width = WindowManager.LayoutParams.WRAP_CONTENT;
mWindowParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
| WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE
| WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
| WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN;
mWindowParams.format = PixelFormat.TRANSLUCENT;
mWindowParams.windowAnimations = 0;
ImageView v = new ImageView(getContext());
v.setBackgroundColor(dragndropBackgroundColor);
v.setImageBitmap(bm);
mDragBitmap = bm;
mWindowManager = (WindowManager)getContext().getSystemService(Context.WINDOW_SERVICE);
mWindowManager.addView(v, mWindowParams);
mDragView = v;
if(mClickListener != null) {
longPressThread = new Thread(longPressRunnable);
longPressThread.start();
}
}
private final Runnable longPressRunnable = new Runnable() {
public void run() {
AndroidUtilities.sleepDeep(1000L);
if(Thread.currentThread().isInterrupted())
return;
if(mDragView != null && mDragPos == mFirstDragPos &&
Math.abs(mDragCurrentX - mDragStartX) < 10) {
post(new Runnable() {
public void run() {
stopDragging(null);
mClickListener.onLongClick(mOriginalView);
invalidate();
}
});
}
}
};
private void dragView(int x, int y) {
float alpha = 1.0f;
int width = mDragView.getWidth();
if (mRemoveMode == SLIDE_RIGHT) {
if (x > width / 2) {
alpha = ((float)(width - x)) / (width / 2);
}
mWindowParams.alpha = alpha;
}
else if (mRemoveMode == SLIDE_LEFT) {
if (x < width / 2) {
alpha = ((float)x) / (width / 2);
}
mWindowParams.alpha = alpha;
}
mWindowParams.y = y - mDragPoint + mCoordOffset;
mWindowManager.updateViewLayout(mDragView, mWindowParams);
mDragCurrentX = x;
}
private void stopDragging(MotionEvent ev) {
if (mDragBitmap != null) {
mDragBitmap.recycle();
mDragBitmap = null;
}
if (mDragView != null) {
WindowManager wm = (WindowManager) getContext().getSystemService(
Context.WINDOW_SERVICE);
wm.removeView(mDragView);
mDragView.setImageDrawable(null);
mDragView = null;
if (ev != null && mClickListener != null) {
// detect press & long press case
if(mDragPos == mFirstDragPos &&
Math.abs(mDragCurrentX - mDragStartX) < 10) {
long pressTime = System.currentTimeMillis() - mDragStartTime;
if(pressTime < 1000)
mClickListener.onClick(mOriginalView);
else
mClickListener.onLongClick(mOriginalView);
}
}
}
if(longPressThread != null) {
longPressThread.interrupt();
longPressThread = null;
}
}
public void setDragListener(DragListener l) {
mDragListener = l;
}
public void setDropListener(DropListener l) {
mDropListener = l;
}
public void setSwipeListener(SwipeListener l) {
mSwipeListener = l;
}
public void setClickListener(GrabberClickListener listener) {
this.mClickListener = listener;
}
public void setDragndropBackgroundColor(int color) {
this.dragndropBackgroundColor = color;
}
public interface GrabberClickListener {
public void onClick(View v);
public void onLongClick(View v);
}
public interface DragListener {
void drag(int from, int to);
}
public interface DropListener {
void drop(int from, int to);
}
public interface SwipeListener {
void swipeLeft(int which);
void swipeRight(int which);
}
}