/*
* 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 com.ghostsq.commander.R;
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.view.GestureDetector.SimpleOnGestureListener;
import android.widget.AdapterView;
import android.widget.ImageView;
import android.widget.ListView;
public class TouchListView extends ListView {
private ImageView mDragView;
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 DragListener mDragListener;
private DropListener mDropListener;
private RemoveListener mRemoveListener;
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 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;
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( mRemoveListener != null && mGestureDetector == null ) {
if( mRemoveMode == FLING ) {
mGestureDetector = new GestureDetector( getContext(), new SimpleOnGestureListener() {
@Override
public boolean onFling( MotionEvent e1, MotionEvent e2, float velocityX, float velocityY ) {
if( mDragView != null ) {
if( velocityX > 1000 ) {
Rect r = mTempRect;
mDragView.getDrawingRect( r );
if( e2.getX() > r.right * 2 / 3 ) {
// fast fling right with release near the
// right edge of the screen
stopDragging();
mRemoveListener.remove( mFirstDragPos );
unExpandViews( true );
}
}
// flinging while dragging should have no effect
return true;
}
return false;
}
} );
}
}
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() );
Rect listBounds = new Rect();
getGlobalVisibleRect( listBounds, null );
startDragging( bitmap, listBounds.left, y );
mDragPos = itemnum;
mFirstDragPos = mDragPos;
mHeight = getHeight();
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 - 32;
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 );
}
}
}
@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();
if( mRemoveMode == SLIDE_RIGHT && ev.getX() > r.left + ( r.width() * 3 / 4 ) ) {
if( mRemoveListener != null ) {
mRemoveListener.remove( mFirstDragPos );
}
unExpandViews( true );
} else if( mRemoveMode == SLIDE_LEFT && ev.getX() < r.left + ( r.width() / 4 ) ) {
if( mRemoveListener != null ) {
mRemoveListener.remove( 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();
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() );
// int backGroundColor =
// getContext().getResources().getColor(R.color.dragndrop_background);
v.setBackgroundColor( dragndropBackgroundColor );
v.setImageBitmap( bm );
mDragBitmap = bm;
mWindowManager = (WindowManager)getContext().getSystemService( "window" );
mWindowManager.addView( v, mWindowParams );
mDragView = v;
}
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 );
}
private void stopDragging() {
if( mDragView != null ) {
WindowManager wm = (WindowManager)getContext().getSystemService( "window" );
wm.removeView( mDragView );
mDragView.setImageDrawable( null );
mDragView = null;
}
if( mDragBitmap != null ) {
mDragBitmap.recycle();
mDragBitmap = null;
}
}
public void setDragListener(DragListener l) {
mDragListener = l;
}
public void setDropListener(DropListener l) {
mDropListener = l;
}
public void setRemoveListener(RemoveListener l) {
mRemoveListener = l;
}
public interface DragListener {
void drag(int from, int to);
}
public interface DropListener {
void drop(int from, int to);
}
public interface RemoveListener {
void remove(int which);
}
}