/*
* Copyright 2013 Lars Werkman
*
* 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.marshalchen.common.ui;
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.widget.ListView;
public class QuickReturnListView extends ListView {
private int mItemCount;
private int mItemOffsetY[];
private boolean scrollIsComputed = false;
private int mHeight;
public QuickReturnListView(Context context) {
super(context);
}
public QuickReturnListView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public int getListHeight() {
return mHeight;
}
public void computeScrollY() {
mHeight = 0;
mItemCount = getAdapter().getCount();
if (mItemOffsetY == null) {
mItemOffsetY = new int[mItemCount];
}
for (int i = 0; i < mItemCount; ++i) {
View view = getAdapter().getView(i, null, this);
view.measure(
MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),
MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
mItemOffsetY[i] = mHeight;
mHeight += view.getMeasuredHeight();
System.out.println(mHeight);
}
scrollIsComputed = true;
}
public boolean scrollYIsComputed() {
return scrollIsComputed;
}
public int getComputedScrollY() {
int pos, nScrollY, nItemY;
View view = null;
pos = getFirstVisiblePosition();
view = getChildAt(0);
nItemY = view.getTop();
nScrollY = mItemOffsetY[pos] - nItemY;
return nScrollY;
}
}