package com.moral.andbrickslib.baseadapter.headandfooter;
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import android.support.v7.widget.GridLayoutManager;
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import android.support.v7.widget.RecyclerView;
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import android.support.v7.widget.StaggeredGridLayoutManager;
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import android.view.View;
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/**
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* Created by cundong on 2015/10/9.
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* <p/>
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* 拓展的StaggeredGridLayoutManager,tks @Jack Tony
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*/
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public class ExStaggeredGridLayoutManager extends StaggeredGridLayoutManager {
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private final String TAG = getClass().getSimpleName();
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GridLayoutManager.SpanSizeLookup mSpanSizeLookup;
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public ExStaggeredGridLayoutManager(int spanCount, int orientation) {
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super(spanCount, orientation);
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}
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/**
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* Returns the current used by the GridLayoutManager.
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*
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* @return The current used by the GridLayoutManager.
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*/
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public GridLayoutManager.SpanSizeLookup getSpanSizeLookup() {
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return mSpanSizeLookup;
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}
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/**
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* 设置某个位置的item的跨列程度,这里和GridLayoutManager有点不一样,
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* 如果你设置某个位置的item的span>1了,那么这个item会占据所有列
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*
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* @param spanSizeLookup instance to be used to query number of spans
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* occupied by each item
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*/
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public void setSpanSizeLookup(GridLayoutManager.SpanSizeLookup spanSizeLookup) {
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mSpanSizeLookup = spanSizeLookup;
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}
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@Override
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public void onMeasure(RecyclerView.Recycler recycler, RecyclerView.State state, int widthSpec, int heightSpec) {
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//Log.d(TAG, "item count = " + getItemCount());
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for (int i = 0; i < getItemCount(); i++) {
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if (mSpanSizeLookup.getSpanSize(i) > 1) {
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//Log.d(TAG, "lookup > 1 = " + i);
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try {
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//fix 动态添加时报IndexOutOfBoundsException
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View view = recycler.getViewForPosition(i);
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if (view != null) {
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/**
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*占用所有的列
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* @see https://plus.google.com/+EtienneLawlor/posts/c5T7fu9ujqi
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*/
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StaggeredGridLayoutManager.LayoutParams lp = (StaggeredGridLayoutManager.LayoutParams) view.getLayoutParams();
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lp.setFullSpan(true);
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}
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// recycler.recycleView(view);
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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}
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super.onMeasure(recycler, state, widthSpec, heightSpec);
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}
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}
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