/*
* Copyright 2013 Google Inc.
*
* 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.asksven.betterbatterystats.contrib;
import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.ScrollView;
/**
* A custom ScrollView that can accept a scroll listener.
*/
public class ObservableScrollView extends ScrollView {
private Callbacks mCallbacks;
public ObservableScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected void onScrollChanged(int l, int t, int oldl, int oldt) {
super.onScrollChanged(l, t, oldl, oldt);
if (mCallbacks != null) {
mCallbacks.onScrollChanged(t);
}
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
if (mCallbacks != null) {
switch (ev.getActionMasked()) {
case MotionEvent.ACTION_DOWN:
mCallbacks.onDownMotionEvent();
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
mCallbacks.onUpOrCancelMotionEvent();
break;
}
}
return super.onTouchEvent(ev);
}
@Override
public int computeVerticalScrollRange() {
return super.computeVerticalScrollRange();
}
public void setCallbacks(Callbacks listener) {
mCallbacks = listener;
}
public static interface Callbacks {
public void onScrollChanged(int scrollY);
public void onDownMotionEvent();
public void onUpOrCancelMotionEvent();
}
}