/*
* 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 semtex.archery.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.*;
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 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;
public TouchListView(final Context context, final AttributeSet attrs) {
this(context, attrs, 0);
}
public TouchListView(final Context context, final AttributeSet attrs, final int defStyle) {
super(context, attrs, defStyle);
mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
if (attrs != null) {
final 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(final View v, final Object data, final boolean isSelectable) {
throw new RuntimeException("Headers are not supported with TouchListView");
}
@Override
final public void addHeaderView(final View v) {
throw new RuntimeException("Headers are not supported with TouchListView");
}
@Override
final public void addFooterView(final View v, final Object data, final 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(final 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(final MotionEvent ev) {
if (mRemoveListener != null && mGestureDetector == null) {
if (mRemoveMode == FLING) {
mGestureDetector = new GestureDetector(getContext(), new SimpleOnGestureListener() {
@Override
public boolean onFling(final MotionEvent e1, final MotionEvent e2, final float velocityX,
final float velocityY) {
if (mDragView != null) {
if (velocityX > 1000) {
final 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:
final int x = (int)ev.getX();
final int y = (int)ev.getY();
final int itemnum = pointToPosition(x, y);
if (itemnum == AdapterView.INVALID_POSITION) {
break;
}
final View item = getChildAt(itemnum - getFirstVisiblePosition());
if (isDraggableRow(item)) {
mDragPoint = y - item.getTop();
mCoordOffset = (int)ev.getRawY() - y;
final View dragger = item.findViewById(grabberId);
final 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
final Bitmap bitmap = Bitmap.createBitmap(item.getDrawingCache());
item.setDrawingCacheEnabled(false);
final Rect listBounds = new Rect();
getGlobalVisibleRect(listBounds, null);
startDragging(bitmap, listBounds.left, y);
mDragPos = itemnum;
mFirstDragPos = mDragPos;
mHeight = getHeight();
final 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(final 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(final int x, final int y) {
final 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(final int y) {
final 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(final 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(final boolean deletion) {
for (int i = 0;; i++) {
View v = getChildAt(i);
if (v == null) {
if (deletion) {
// HACK force update of mItemCount
final int position = getFirstVisiblePosition();
final 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)) {
final 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++;
}
final View first = getChildAt(mFirstDragPos - getFirstVisiblePosition());
for (int i = 0;; i++) {
final 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)) {
final 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(final MotionEvent ev) {
if (mGestureDetector != null) {
mGestureDetector.onTouchEvent(ev);
}
if ((mDragListener != null || mDropListener != null) && mDragView != null) {
final int action = ev.getAction();
switch (action) {
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
final 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:
final int x = (int)ev.getX();
final int y = (int)ev.getY();
dragView(x, y);
final 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);
}
final View v = getChildAt(ref - getFirstVisiblePosition());
if (v != null) {
final int pos = v.getTop();
setSelectionFromTop(ref, pos - speed);
}
}
}
break;
}
return true;
}
return super.onTouchEvent(ev);
}
private void startDragging(final Bitmap bm, final int x, final int y) {
stopDragging();
mWindowParams = new WindowManager.LayoutParams();
mWindowParams.gravity = Gravity.TOP | Gravity.LEFT;
mWindowParams.x = x;
mWindowParams.y = y - mDragPoint + mCoordOffset;
mWindowParams.height = android.view.ViewGroup.LayoutParams.WRAP_CONTENT;
mWindowParams.width = android.view.ViewGroup.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;
final 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(final int x, final int y) {
float alpha = 1.0f;
final 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) {
final WindowManager wm = (WindowManager)getContext().getSystemService("window");
wm.removeView(mDragView);
mDragView.setImageDrawable(null);
mDragView = null;
}
if (mDragBitmap != null) {
mDragBitmap.recycle();
mDragBitmap = null;
}
}
public void setDragListener(final DragListener l) {
mDragListener = l;
}
public void setDropListener(final DropListener l) {
mDropListener = l;
}
public void setRemoveListener(final 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);
}
}