/*******************************************************************************
* Copyright 2011-2013 Sergey Tarasevich
*
* 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.lidroid.xutils.bitmap;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import com.lidroid.xutils.BitmapUtils;
import com.lidroid.xutils.task.TaskHandler;
public class PauseOnScrollListener implements OnScrollListener {
private TaskHandler taskHandler;
private final boolean pauseOnScroll;
private final boolean pauseOnFling;
private final OnScrollListener externalListener;
/**
* Constructor
*
* @param taskHandler {@linkplain BitmapUtils} instance for controlling
* @param pauseOnScroll Whether {@linkplain BitmapUtils#pause() pause loading} during touch scrolling
* @param pauseOnFling Whether {@linkplain BitmapUtils#pause() pause loading} during fling
*/
public PauseOnScrollListener(TaskHandler taskHandler, boolean pauseOnScroll, boolean pauseOnFling) {
this(taskHandler, pauseOnScroll, pauseOnFling, null);
}
/**
* Constructor
*
* @param taskHandler {@linkplain BitmapUtils} instance for controlling
* @param pauseOnScroll Whether {@linkplain BitmapUtils#pause() pause loading} during touch scrolling
* @param pauseOnFling Whether {@linkplain BitmapUtils#pause() pause loading} during fling
* @param customListener Your custom {@link android.widget.AbsListView.OnScrollListener} for {@linkplain android.widget.AbsListView list view} which also will
* be get scroll events
*/
public PauseOnScrollListener(TaskHandler taskHandler, boolean pauseOnScroll, boolean pauseOnFling, OnScrollListener customListener) {
this.taskHandler = taskHandler;
this.pauseOnScroll = pauseOnScroll;
this.pauseOnFling = pauseOnFling;
externalListener = customListener;
}
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
switch (scrollState) {
case OnScrollListener.SCROLL_STATE_IDLE:
taskHandler.resume();
break;
case OnScrollListener.SCROLL_STATE_TOUCH_SCROLL:
if (pauseOnScroll) {
taskHandler.pause();
}
break;
case OnScrollListener.SCROLL_STATE_FLING:
if (pauseOnFling) {
taskHandler.pause();
}
break;
}
if (externalListener != null) {
externalListener.onScrollStateChanged(view, scrollState);
}
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
if (externalListener != null) {
externalListener.onScroll(view, firstVisibleItem, visibleItemCount, totalItemCount);
}
}
}