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/*
* Android Wheel Control.
* https://code.google.com/p/android-wheel/
*
* Copyright 2011 Yuri Kanivets
*
* 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 kankan.wheel.widget;
import android.view.View;
import android.widget.LinearLayout;
import java.util.LinkedList;
import java.util.List;
/**
* Recycle stores wheel items to reuse.
*/
public class WheelRecycle {
// Cached items
private List<View> items;
// Cached empty items
private List<View> emptyItems;
// Wheel view
private WheelView wheel;
/**
* Constructor
* @param wheel the wheel view
*/
public WheelRecycle(WheelView wheel) {
this.wheel = wheel;
}
/**
* Recycles items from specified layout.
* There are saved only items not included to specified range.
* All the cached items are removed from original layout.
*
* @param layout the layout containing items to be cached
* @param firstItem the number of first item in layout
* @param range the range of current wheel items
* @return the new value of first item number
*/
public int recycleItems(LinearLayout layout, int firstItem, ItemsRange range) {
int index = firstItem;
for (int i = 0; i < layout.getChildCount();) {
if (!range.contains(index)) {
recycleView(layout.getChildAt(i), index);
layout.removeViewAt(i);
if (i == 0) { // first item
firstItem++;
}
} else {
i++; // go to next item
}
index++;
}
return firstItem;
}
/**
* Gets item view
* @return the cached view
*/
public View getItem() {
return getCachedView(items);
}
/**
* Gets empty item view
* @return the cached empty view
*/
public View getEmptyItem() {
return getCachedView(emptyItems);
}
/**
* Clears all views
*/
public void clearAll() {
if (items != null) {
items.clear();
}
if (emptyItems != null) {
emptyItems.clear();
}
}
/**
* Adds view to specified cache. Creates a cache list if it is null.
* @param view the view to be cached
* @param cache the cache list
* @return the cache list
*/
private List<View> addView(View view, List<View> cache) {
if (cache == null) {
cache = new LinkedList<View>();
}
cache.add(view);
return cache;
}
/**
* Adds view to cache. Determines view type (item view or empty one) by index.
* @param view the view to be cached
* @param index the index of view
*/
private void recycleView(View view, int index) {
int count = wheel.getViewAdapter().getItemsCount();
if ((index < 0 || index >= count) && !wheel.isCyclic()) {
// empty view
emptyItems = addView(view, emptyItems);
} else {
while (index < 0) {
index = count + index;
}
index %= count;
items = addView(view, items);
}
}
/**
* Gets view from specified cache.
* @param cache the cache
* @return the first view from cache.
*/
private View getCachedView(List<View> cache) {
if (cache != null && cache.size() > 0) {
View view = cache.get(0);
cache.remove(0);
return view;
}
return null;
}
}
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