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/*
* Copyright (C) 2010 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.systemui.statusbar;
import android.content.Context;
import android.util.Log;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.ViewConfiguration;
import com.android.systemui.R;
public class ItemTouchDispatcher {
private static final String TAG = "NotificationTouchDispatcher";
/* package */ static final boolean DBG = false;
private final GestureDetector mGestureDetector;
private LatestItemContainer mItem;
/* stored as class member to avoid garbage creation */
private int[] mItemLocation = new int[2];
public ItemTouchDispatcher(final Context context) {
mGestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float vX, float vY) {
final ViewConfiguration vc = ViewConfiguration.get(context);
int minDistance = vc.getScaledTouchSlop();
int distance = (int) Math.abs(e2.getX() - e1.getX());
boolean result = false;
if (DBG) {
Log.v(TAG, "Fling detected, distance " + distance + " vs. " +
minDistance + " vX " + vX + " vY " + vY);
}
if (distance > minDistance && Math.abs(vX) > Math.abs(vY)) {
mItem.finishSwipe(vX > 0);
result = true;
} else {
mItem.stopSwipe();
}
mItem = null;
return result;
}
});
}
public void setItem(LatestItemContainer item) {
mItem = item;
}
public void releaseItem(LatestItemContainer item) {
if (item == mItem) {
mItem = null;
}
}
public boolean needsInterceptTouch(MotionEvent event) {
if ((event.getAction() & MotionEvent.ACTION_MASK) == MotionEvent.ACTION_DOWN) {
if (mItem != null) {
/*
* If we get a DOWN event and still have an item, we must have missed unregistering
* the item on the last UP event. In that case, do it here to preserve sanity.
*/
Log.w(TAG, "Clearing stale item " + mItem);
mItem.stopSwipe();
mItem = null;
}
}
if (mItem != null) {
if (DBG) Log.v(TAG, "Need to intercept touch event " + event + " due to item " + mItem);
mItem.setEventsControlledByDispatcher();
return true;
}
return false;
}
public boolean handleTouchEvent(MotionEvent event) {
/*
* We are called from different sources, so make sure we use a
* consistent coordinate system.
*/
MotionEvent real = MotionEvent.obtain(event);
real.setLocation(event.getRawX(), event.getRawY());
boolean handled = mGestureDetector.onTouchEvent(real);
if (DBG) Log.v(TAG, "Handling touch event " + event + " handled " + handled);
if (mItem != null) {
/*
* Convert coordinates to item coordinates
*/
mItem.getLocationOnScreen(mItemLocation);
real.offsetLocation(mItemLocation[0], mItemLocation[1]);
mItem.dispatchTouchEvent(real);
if (DBG) Log.v(TAG, "Converted event to " + real);
switch (real.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
mItem.stopSwipe();
mItem = null;
handled = true;
break;
}
}
real.recycle();
return handled;
}
}
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