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/*
* Copyright (C) 2012 Google Inc.
* Licensed to 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.dialer.list;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.content.Context;
import android.content.res.Configuration;
import android.graphics.Bitmap;
import android.os.Handler;
import android.util.AttributeSet;
import android.util.Log;
import android.view.DragEvent;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.ListView;
import com.android.dialer.R;
import com.android.dialer.list.PhoneFavoritesTileAdapter.ContactTileRow;
import com.android.dialer.list.SwipeHelper.OnItemGestureListener;
import com.android.dialer.list.SwipeHelper.SwipeHelperCallback;
/**
* The ListView composed of {@link ContactTileRow}.
* This ListView handles both
* - Swiping, which is borrowed from packages/apps/UnifiedEmail (com.android.mail.ui.Swipeable)
* - Drag and drop
*/
public class PhoneFavoriteListView extends ListView implements SwipeHelperCallback {
public static final String LOG_TAG = PhoneFavoriteListView.class.getSimpleName();
private SwipeHelper mSwipeHelper;
private boolean mEnableSwipe = true;
private OnItemGestureListener mOnItemGestureListener;
private OnDragDropListener mOnDragDropListener;
private float mDensityScale;
private float mTouchSlop;
private int mTopScrollBound;
private int mBottomScrollBound;
private int mLastDragY;
private Handler mScrollHandler;
private final long SCROLL_HANDLER_DELAY_MILLIS = 5;
private final int DRAG_SCROLL_PX_UNIT = 10;
private boolean mIsDragScrollerRunning = false;
private int mTouchDownForDragStartX;
private int mTouchDownForDragStartY;
private Bitmap mDragShadowBitmap;
private ImageView mDragShadowOverlay;
private int mAnimationDuration;
// X and Y offsets inside the item from where the user grabbed to the
// child's left coordinate. This is used to aid in the drawing of the drag shadow.
private int mTouchOffsetToChildLeft;
private int mTouchOffsetToChildTop;
private int mDragShadowLeft;
private int mDragShadowTop;
private final float DRAG_SHADOW_ALPHA = 0.7f;
/**
* {@link #mTopScrollBound} and {@link mBottomScrollBound} will be
* offseted to the top / bottom by {@link #getHeight} * {@link #BOUND_GAP_RATIO} pixels.
*/
private final float BOUND_GAP_RATIO = 0.2f;
private final Runnable mDragScroller = new Runnable() {
@Override
public void run() {
if (mLastDragY <= mTopScrollBound) {
smoothScrollBy(-DRAG_SCROLL_PX_UNIT, (int) SCROLL_HANDLER_DELAY_MILLIS);
} else if (mLastDragY >= mBottomScrollBound) {
smoothScrollBy(DRAG_SCROLL_PX_UNIT, (int) SCROLL_HANDLER_DELAY_MILLIS);
}
mScrollHandler.postDelayed(this, SCROLL_HANDLER_DELAY_MILLIS);
}
};
private final AnimatorListenerAdapter mDragShadowOverAnimatorListener =
new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
if (mDragShadowBitmap != null) {
mDragShadowBitmap.recycle();
mDragShadowBitmap = null;
}
mDragShadowOverlay.setVisibility(GONE);
mDragShadowOverlay.setImageBitmap(null);
}
};
public PhoneFavoriteListView(Context context) {
this(context, null);
}
public PhoneFavoriteListView(Context context, AttributeSet attrs) {
this(context, attrs, -1);
}
public PhoneFavoriteListView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mAnimationDuration = context.getResources().getInteger(R.integer.fade_duration);
mDensityScale = getResources().getDisplayMetrics().density;
mTouchSlop = ViewConfiguration.get(context).getScaledPagingTouchSlop();
mSwipeHelper = new SwipeHelper(context, SwipeHelper.X, this,
mDensityScale, mTouchSlop);
setItemsCanFocus(true);
}
@Override
protected void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
mDensityScale= getResources().getDisplayMetrics().density;
mTouchSlop = ViewConfiguration.get(getContext()).getScaledPagingTouchSlop();
mSwipeHelper.setDensityScale(mDensityScale);
mSwipeHelper.setPagingTouchSlop(mTouchSlop);
}
/**
* Enable swipe gestures.
*/
public void enableSwipe(boolean enable) {
mEnableSwipe = enable;
}
public boolean isSwipeEnabled() {
return mEnableSwipe && mOnItemGestureListener.isSwipeEnabled();
}
public void setOnItemSwipeListener(OnItemGestureListener listener) {
mOnItemGestureListener = listener;
}
public void setOnDragDropListener(OnDragDropListener listener) {
mOnDragDropListener = listener;
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
if (ev.getAction() == MotionEvent.ACTION_DOWN) {
mTouchDownForDragStartX = (int) ev.getX();
mTouchDownForDragStartY = (int) ev.getY();
}
if (isSwipeEnabled()) {
return mSwipeHelper.onInterceptTouchEvent(ev) || super.onInterceptTouchEvent(ev);
} else {
return super.onInterceptTouchEvent(ev);
}
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
if (mOnItemGestureListener != null) {
mOnItemGestureListener.onTouch();
}
if (isSwipeEnabled()) {
return mSwipeHelper.onTouchEvent(ev) || super.onTouchEvent(ev);
} else {
return super.onTouchEvent(ev);
}
}
@Override
public View getChildAtPosition(MotionEvent ev) {
final View view = getViewAtPosition((int) ev.getX(), (int) ev.getY());
if (view != null &&
SwipeHelper.isSwipeable(view) &&
view.getVisibility() != GONE) {
// If this view is swipable in this listview, then return it. Otherwise
// return a null view, which will simply be ignored by the swipe helper.
return view;
}
return null;
}
@Override
public View getChildContentView(View view) {
return view.findViewById(R.id.contact_favorite_card);
}
@Override
public void onScroll() {}
@Override
public boolean canChildBeDismissed(View v) {
return SwipeHelper.isSwipeable(v);
}
@Override
public void onChildDismissed(final View v) {
if (v != null) {
if (mOnItemGestureListener != null) {
mOnItemGestureListener.onSwipe(v);
}
}
}
@Override
public void onDragCancelled(View v) {}
@Override
public void onBeginDrag(View v) {
final View tileRow = (View) v.getParent();
// We do this so the underlying ScrollView knows that it won't get
// the chance to intercept events anymore
requestDisallowInterceptTouchEvent(true);
}
@Override
public boolean dispatchDragEvent(DragEvent event) {
final int action = event.getAction();
final int eX = (int) event.getX();
final int eY = (int) event.getY();
switch (action) {
case DragEvent.ACTION_DRAG_STARTED:
if (!handleDragStarted(mTouchDownForDragStartX, mTouchDownForDragStartY)) {
return false;
};
break;
case DragEvent.ACTION_DRAG_LOCATION:
mLastDragY = eY;
handleDragHovered(eX, eY);
// Kick off {@link #mScrollHandler} if it's not started yet.
if (!mIsDragScrollerRunning &&
// And if the distance traveled while dragging exceeds the touch slop
(Math.abs(mLastDragY - mTouchDownForDragStartY) >= 4 * mTouchSlop)) {
mIsDragScrollerRunning = true;
ensureScrollHandler();
mScrollHandler.postDelayed(mDragScroller, SCROLL_HANDLER_DELAY_MILLIS);
}
break;
case DragEvent.ACTION_DRAG_ENTERED:
final int boundGap = (int) (getHeight() * BOUND_GAP_RATIO);
mTopScrollBound = (getTop() + boundGap);
mBottomScrollBound = (getBottom() - boundGap);
break;
case DragEvent.ACTION_DRAG_EXITED:
case DragEvent.ACTION_DRAG_ENDED:
case DragEvent.ACTION_DROP:
ensureScrollHandler();
mScrollHandler.removeCallbacks(mDragScroller);
mIsDragScrollerRunning = false;
// Either a successful drop or it's ended with out drop.
if (action == DragEvent.ACTION_DROP || action == DragEvent.ACTION_DRAG_ENDED) {
handleDragFinished(eX, eY);
}
break;
default:
break;
}
// This ListView will consumer the drag events on behalf of its children.
return true;
}
public void setDragShadowOverlay(ImageView overlay) {
mDragShadowOverlay = overlay;
}
/**
* Find the view under the pointer.
*/
private View getViewAtPosition(int x, int y) {
final int count = getChildCount();
View child;
for (int childIdx = 0; childIdx < count; childIdx++) {
child = getChildAt(childIdx);
if (y >= child.getTop() && y <= child.getBottom()) {
return child;
}
}
return null;
}
private void ensureScrollHandler() {
if (mScrollHandler == null) {
mScrollHandler = getHandler();
}
}
/**
* @return True if the drag is started.
*/
private boolean handleDragStarted(int x, int y) {
final View child = getViewAtPosition(x, y);
if (!(child instanceof ContactTileRow)) {
// Bail early.
return false;
}
final ContactTileRow tile = (ContactTileRow) child;
if (tile.getTileAdapter().hasPotentialRemoveEntryIndex()) {
return false;
}
final int itemIndex = tile.getItemIndex(x, y);
if (itemIndex != -1 && mOnDragDropListener != null) {
final PhoneFavoriteTileView tileView =
(PhoneFavoriteTileView) tile.getViewAtPosition(x, y);
if (mDragShadowOverlay == null) {
return false;
}
mDragShadowOverlay.clearAnimation();
mDragShadowBitmap = createDraggedChildBitmap(tileView);
if (mDragShadowBitmap == null) {
return false;
}
if (tileView instanceof PhoneFavoriteRegularRowView) {
mDragShadowLeft = tile.getLeft();
mDragShadowTop = tile.getTop();
} else {
// Square tile is relative to the contact tile,
// and contact tile is relative to this list view.
mDragShadowLeft = tileView.getLeft() + tileView.getParentRow().getLeft();
mDragShadowTop = tileView.getTop() + tileView.getParentRow().getTop();
}
mDragShadowOverlay.setImageBitmap(mDragShadowBitmap);
mDragShadowOverlay.setVisibility(VISIBLE);
mDragShadowOverlay.setAlpha(DRAG_SHADOW_ALPHA);
mDragShadowOverlay.setX(mDragShadowLeft);
mDragShadowOverlay.setY(mDragShadowTop);
// x and y passed in are the coordinates of where the user has touched down, calculate
// the offset to the top left coordinate of the dragged child. This will be used for
// drawing the drag shadow.
mTouchOffsetToChildLeft = x - mDragShadowLeft;
mTouchOffsetToChildTop = y - mDragShadowTop;
// invalidate to trigger a redraw of the drag shadow.
invalidate();
mOnDragDropListener.onDragStarted(itemIndex);
}
return true;
}
private void handleDragHovered(int x, int y) {
// Update the drag shadow location.
mDragShadowLeft = x - mTouchOffsetToChildLeft;
mDragShadowTop = y - mTouchOffsetToChildTop;
// Draw the drag shadow at its last known location if the drag shadow exists.
if (mDragShadowOverlay != null) {
mDragShadowOverlay.setX(mDragShadowLeft);
mDragShadowOverlay.setY(mDragShadowTop);
}
final View child = getViewAtPosition(x, y);
if (!(child instanceof ContactTileRow)) {
// Bail early.
return;
}
final ContactTileRow tile = (ContactTileRow) child;
final int itemIndex = tile.getItemIndex(x, y);
if (itemIndex != -1 && mOnDragDropListener != null) {
mOnDragDropListener.onDragHovered(itemIndex);
}
}
private void handleDragFinished(int x, int y) {
// Update the drag shadow location.
mDragShadowLeft = x - mTouchOffsetToChildLeft;
mDragShadowTop = y - mTouchOffsetToChildTop;
if (mDragShadowOverlay != null) {
mDragShadowOverlay.clearAnimation();
mDragShadowOverlay.animate().alpha(0.0f)
.setDuration(mAnimationDuration)
.setListener(mDragShadowOverAnimatorListener)
.start();
}
if (mOnDragDropListener != null) {
mOnDragDropListener.onDragFinished();
}
}
private Bitmap createDraggedChildBitmap(View view) {
view.setDrawingCacheEnabled(true);
final Bitmap cache = view.getDrawingCache();
Bitmap bitmap = null;
if (cache != null) {
try {
bitmap = cache.copy(Bitmap.Config.ARGB_8888, false);
} catch (final OutOfMemoryError e) {
Log.w(LOG_TAG, "Failed to copy bitmap from Drawing cache", e);
bitmap = null;
}
}
view.destroyDrawingCache();
view.setDrawingCacheEnabled(false);
return bitmap;
}
public interface OnDragDropListener {
public void onDragStarted(int itemIndex);
public void onDragHovered(int itemIndex);
public void onDragFinished();
}
}
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