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/*
* Copyright (C) 2013 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.gallery3d.filtershow.state;
import android.view.DragEvent;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.LinearLayout;
class DragListener implements View.OnDragListener {
private static final String LOGTAG = "DragListener";
private PanelTrack mStatePanelTrack;
private static float sSlope = 0.2f;
public DragListener(PanelTrack statePanelTrack) {
mStatePanelTrack = statePanelTrack;
}
private void setState(DragEvent event) {
float translation = event.getY() - mStatePanelTrack.getTouchPoint().y;
float alpha = 1.0f - (Math.abs(translation)
/ mStatePanelTrack.getCurrentView().getHeight());
if (mStatePanelTrack.getOrientation() == LinearLayout.VERTICAL) {
translation = event.getX() - mStatePanelTrack.getTouchPoint().x;
alpha = 1.0f - (Math.abs(translation)
/ mStatePanelTrack.getCurrentView().getWidth());
mStatePanelTrack.getCurrentView().setTranslationX(translation);
} else {
mStatePanelTrack.getCurrentView().setTranslationY(translation);
}
mStatePanelTrack.getCurrentView().setBackgroundAlpha(alpha);
}
@Override
public boolean onDrag(View v, DragEvent event) {
switch (event.getAction()) {
case DragEvent.ACTION_DRAG_STARTED: {
break;
}
case DragEvent.ACTION_DRAG_LOCATION: {
if (mStatePanelTrack.getCurrentView() != null) {
setState(event);
View over = mStatePanelTrack.findChildAt((int) event.getX(),
(int) event.getY());
if (over != null && over != mStatePanelTrack.getCurrentView()) {
StateView stateView = (StateView) over;
if (stateView != mStatePanelTrack.getCurrentView()) {
int pos = mStatePanelTrack.findChild(over);
int origin = mStatePanelTrack.findChild(
mStatePanelTrack.getCurrentView());
ArrayAdapter array = (ArrayAdapter) mStatePanelTrack.getAdapter();
if (origin != -1 && pos != -1) {
State current = (State) array.getItem(origin);
array.remove(current);
array.insert(current, pos);
mStatePanelTrack.fillContent(false);
mStatePanelTrack.setCurrentView(mStatePanelTrack.getChildAt(pos));
}
}
}
}
break;
}
case DragEvent.ACTION_DRAG_ENTERED: {
mStatePanelTrack.setExited(false);
if (mStatePanelTrack.getCurrentView() != null) {
mStatePanelTrack.getCurrentView().setVisibility(View.VISIBLE);
}
return true;
}
case DragEvent.ACTION_DRAG_EXITED: {
if (mStatePanelTrack.getCurrentView() != null) {
setState(event);
mStatePanelTrack.getCurrentView().setVisibility(View.INVISIBLE);
}
mStatePanelTrack.setExited(true);
break;
}
case DragEvent.ACTION_DROP: {
break;
}
case DragEvent.ACTION_DRAG_ENDED: {
if (mStatePanelTrack.getCurrentView() != null
&& mStatePanelTrack.getCurrentView().getAlpha() > sSlope) {
setState(event);
}
mStatePanelTrack.checkEndState();
break;
}
default:
break;
}
return true;
}
}
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