package com.wpc.library.widget;
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/**
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* Created by weikou2015 on 2017/6/28.
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*/
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import android.content.Context;
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import android.database.DataSetObservable;
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import android.database.DataSetObserver;
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import android.util.AttributeSet;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.AdapterView;
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import android.widget.Filter;
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import android.widget.Filterable;
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import android.widget.FrameLayout;
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import android.widget.GridView;
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import android.widget.ListAdapter;
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import android.widget.WrapperListAdapter;
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import java.util.ArrayList;
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/**
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* A {@link GridView} that supports adding header rows in a
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* See {@link HeaderGridView#addHeaderView(View, Object, boolean)}
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*/
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public class HeaderGridView extends GridView {
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private static final String TAG = "HeaderGridView";
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/**
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* A class that represents a fixed view in a list, for example a header at the top
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* or a footer at the bottom.
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*/
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private static class FixedViewInfo {
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/**
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* The view to add to the grid
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*/
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public View view;
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public ViewGroup viewContainer;
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/**
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* The data backing the view. This is returned from {@link ListAdapter#getItem(int)}.
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*/
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public Object data;
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/**
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* <code>true</code> if the fixed view should be selectable in the grid
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*/
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public boolean isSelectable;
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}
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private ArrayList<FixedViewInfo> mHeaderViewInfos = new ArrayList<FixedViewInfo>();
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private void initHeaderGridView() {
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super.setClipChildren(false);
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}
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public HeaderGridView(Context context) {
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super(context);
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initHeaderGridView();
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}
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public HeaderGridView(Context context, AttributeSet attrs) {
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super(context, attrs);
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initHeaderGridView();
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}
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public HeaderGridView(Context context, AttributeSet attrs, int defStyle) {
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super(context, attrs, defStyle);
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initHeaderGridView();
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}
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@Override
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protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
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super.onMeasure(widthMeasureSpec, heightMeasureSpec);
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ListAdapter adapter = getAdapter();
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if (adapter != null && adapter instanceof HeaderViewGridAdapter) {
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((HeaderViewGridAdapter) adapter).setNumColumns(getNumColumns());
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}
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}
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@Override
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public void setClipChildren(boolean clipChildren) {
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// Ignore, since the header rows depend on not being clipped
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}
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/**
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* Add a fixed view to appear at the top of the grid. If addHeaderView is
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* called more than once, the views will appear in the order they were
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* added. Views added using this call can take focus if they want.
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* <p>
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* NOTE: Call this before calling setAdapter. This is so HeaderGridView can wrap
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* the supplied cursor with one that will also account for header views.
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*
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* @param v The view to add.
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* @param data Data to associate with this view
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* @param isSelectable whether the item is selectable
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*/
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public void addHeaderView(View v, Object data, boolean isSelectable) {
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ListAdapter adapter = getAdapter();
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if (adapter != null && !(adapter instanceof HeaderViewGridAdapter)) {
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throw new IllegalStateException(
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"Cannot add header view to grid -- setAdapter has already been called.");
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}
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FixedViewInfo info = new FixedViewInfo();
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FrameLayout fl = new FullWidthFixedViewLayout(getContext());
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fl.addView(v);
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info.view = v;
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info.viewContainer = fl;
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info.data = data;
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info.isSelectable = isSelectable;
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mHeaderViewInfos.add(info);
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// in the case of re-adding a header view, or adding one later on,
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// we need to notify the observer
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if (adapter != null) {
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((HeaderViewGridAdapter) adapter).notifyDataSetChanged();
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}
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}
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/**
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* Add a fixed view to appear at the top of the grid. If addHeaderView is
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* called more than once, the views will appear in the order they were
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* added. Views added using this call can take focus if they want.
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* <p>
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* NOTE: Call this before calling setAdapter. This is so HeaderGridView can wrap
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* the supplied cursor with one that will also account for header views.
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*
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* @param v The view to add.
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*/
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public void addHeaderView(View v) {
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addHeaderView(v, null, true);
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}
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public int getHeaderViewCount() {
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return mHeaderViewInfos.size();
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}
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/**
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* Removes a previously-added header view.
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*
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* @param v The view to remove
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* @return true if the view was removed, false if the view was not a header
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* view
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*/
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public boolean removeHeaderView(View v) {
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if (mHeaderViewInfos.size() > 0) {
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boolean result = false;
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ListAdapter adapter = getAdapter();
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if (adapter != null && ((HeaderViewGridAdapter) adapter).removeHeader(v)) {
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result = true;
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}
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removeFixedViewInfo(v, mHeaderViewInfos);
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return result;
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}
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return false;
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}
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private void removeFixedViewInfo(View v, ArrayList<FixedViewInfo> where) {
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int len = where.size();
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for (int i = 0; i < len; ++i) {
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FixedViewInfo info = where.get(i);
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if (info.view == v) {
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where.remove(i);
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break;
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}
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}
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}
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@Override
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public void setAdapter(ListAdapter adapter) {
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if (mHeaderViewInfos.size() > 0) {
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HeaderViewGridAdapter hadapter = new HeaderViewGridAdapter(mHeaderViewInfos, adapter);
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int numColumns = getNumColumns();
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if (numColumns > 1) {
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hadapter.setNumColumns(numColumns);
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}
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super.setAdapter(hadapter);
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} else {
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super.setAdapter(adapter);
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}
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}
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private class FullWidthFixedViewLayout extends FrameLayout {
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public FullWidthFixedViewLayout(Context context) {
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super(context);
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}
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@Override
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protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
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int targetWidth = HeaderGridView.this.getMeasuredWidth()
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- HeaderGridView.this.getPaddingLeft()
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- HeaderGridView.this.getPaddingRight();
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widthMeasureSpec = MeasureSpec.makeMeasureSpec(targetWidth,
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MeasureSpec.getMode(widthMeasureSpec));
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super.onMeasure(widthMeasureSpec, heightMeasureSpec);
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}
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}
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/**
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* ListAdapter used when a HeaderGridView has header views. This ListAdapter
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* wraps another one and also keeps track of the header views and their
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* associated data objects.
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* <p>This is intended as a base class; you will probably not need to
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* use this class directly in your own code.
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*/
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private static class HeaderViewGridAdapter implements WrapperListAdapter, Filterable {
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// This is used to notify the container of updates relating to number of columns
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// or headers changing, which changes the number of placeholders needed
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private final DataSetObservable mDataSetObservable = new DataSetObservable();
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private final ListAdapter mAdapter;
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private int mNumColumns = 1;
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// This ArrayList is assumed to NOT be null.
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ArrayList<FixedViewInfo> mHeaderViewInfos;
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boolean mAreAllFixedViewsSelectable;
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private final boolean mIsFilterable;
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public HeaderViewGridAdapter(ArrayList<FixedViewInfo> headerViewInfos, ListAdapter adapter) {
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mAdapter = adapter;
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mIsFilterable = adapter instanceof Filterable;
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if (headerViewInfos == null) {
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throw new IllegalArgumentException("headerViewInfos cannot be null");
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}
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mHeaderViewInfos = headerViewInfos;
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mAreAllFixedViewsSelectable = areAllListInfosSelectable(mHeaderViewInfos);
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}
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public int getHeadersCount() {
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return mHeaderViewInfos.size();
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}
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@Override
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public boolean isEmpty() {
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return (mAdapter == null || mAdapter.isEmpty()) && getHeadersCount() == 0;
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}
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public void setNumColumns(int numColumns) {
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if (numColumns < 1) {
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throw new IllegalArgumentException("Number of columns must be 1 or more");
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}
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if (mNumColumns != numColumns) {
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mNumColumns = numColumns;
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notifyDataSetChanged();
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}
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}
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private boolean areAllListInfosSelectable(ArrayList<FixedViewInfo> infos) {
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if (infos != null) {
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for (FixedViewInfo info : infos) {
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if (!info.isSelectable) {
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return false;
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}
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}
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}
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return true;
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}
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public boolean removeHeader(View v) {
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for (int i = 0; i < mHeaderViewInfos.size(); i++) {
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FixedViewInfo info = mHeaderViewInfos.get(i);
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if (info.view == v) {
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mHeaderViewInfos.remove(i);
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mAreAllFixedViewsSelectable = areAllListInfosSelectable(mHeaderViewInfos);
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mDataSetObservable.notifyChanged();
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return true;
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}
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}
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return false;
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}
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@Override
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public int getCount() {
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if (mAdapter != null) {
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return getHeadersCount() * mNumColumns + mAdapter.getCount();
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} else {
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return getHeadersCount() * mNumColumns;
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}
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}
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@Override
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public boolean areAllItemsEnabled() {
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if (mAdapter != null) {
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return mAreAllFixedViewsSelectable && mAdapter.areAllItemsEnabled();
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} else {
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return true;
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}
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}
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@Override
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public boolean isEnabled(int position) {
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// Header (negative positions will throw an ArrayIndexOutOfBoundsException)
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int numHeadersAndPlaceholders = getHeadersCount() * mNumColumns;
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if (position < numHeadersAndPlaceholders) {
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return (position % mNumColumns == 0)
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&& mHeaderViewInfos.get(position / mNumColumns).isSelectable;
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}
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// Adapter
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final int adjPosition = position - numHeadersAndPlaceholders;
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int adapterCount = 0;
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if (mAdapter != null) {
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adapterCount = mAdapter.getCount();
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if (adjPosition < adapterCount) {
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return mAdapter.isEnabled(adjPosition);
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}
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}
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throw new ArrayIndexOutOfBoundsException(position);
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}
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@Override
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public Object getItem(int position) {
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// Header (negative positions will throw an ArrayIndexOutOfBoundsException)
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int numHeadersAndPlaceholders = getHeadersCount() * mNumColumns;
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if (position < numHeadersAndPlaceholders) {
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if (position % mNumColumns == 0) {
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return mHeaderViewInfos.get(position / mNumColumns).data;
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}
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return null;
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}
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// Adapter
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final int adjPosition = position - numHeadersAndPlaceholders;
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int adapterCount = 0;
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if (mAdapter != null) {
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adapterCount = mAdapter.getCount();
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if (adjPosition < adapterCount) {
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return mAdapter.getItem(adjPosition);
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}
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}
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throw new ArrayIndexOutOfBoundsException(position);
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}
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@Override
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public long getItemId(int position) {
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int numHeadersAndPlaceholders = getHeadersCount() * mNumColumns;
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if (mAdapter != null && position >= numHeadersAndPlaceholders) {
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int adjPosition = position - numHeadersAndPlaceholders;
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int adapterCount = mAdapter.getCount();
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if (adjPosition < adapterCount) {
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return mAdapter.getItemId(adjPosition);
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}
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}
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return -1;
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}
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@Override
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public boolean hasStableIds() {
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if (mAdapter != null) {
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return mAdapter.hasStableIds();
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}
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return false;
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}
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@Override
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public View getView(int position, View convertView, ViewGroup parent) {
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// Header (negative positions will throw an ArrayIndexOutOfBoundsException)
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int numHeadersAndPlaceholders = getHeadersCount() * mNumColumns;
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if (position < numHeadersAndPlaceholders) {
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View headerViewContainer = mHeaderViewInfos
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.get(position / mNumColumns).viewContainer;
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if (position % mNumColumns == 0) {
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return headerViewContainer;
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} else {
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if (convertView == null) {
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convertView = new View(parent.getContext());
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}
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// We need to do this because GridView uses the height of the last item
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// in a row to determine the height for the entire row.
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convertView.setVisibility(View.INVISIBLE);
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convertView.setMinimumHeight(headerViewContainer.getHeight());
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return convertView;
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}
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}
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// Adapter
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final int adjPosition = position - numHeadersAndPlaceholders;
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int adapterCount = 0;
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if (mAdapter != null) {
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adapterCount = mAdapter.getCount();
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if (adjPosition < adapterCount) {
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return mAdapter.getView(adjPosition, convertView, parent);
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}
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}
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throw new ArrayIndexOutOfBoundsException(position);
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}
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@Override
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public int getItemViewType(int position) {
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int numHeadersAndPlaceholders = getHeadersCount() * mNumColumns;
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if (position < numHeadersAndPlaceholders && (position % mNumColumns != 0)) {
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// Placeholders get the last view type number
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return mAdapter != null ? mAdapter.getViewTypeCount() : 1;
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}
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if (mAdapter != null && position >= numHeadersAndPlaceholders) {
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int adjPosition = position - numHeadersAndPlaceholders;
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int adapterCount = mAdapter.getCount();
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if (adjPosition < adapterCount) {
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return mAdapter.getItemViewType(adjPosition);
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}
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}
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return AdapterView.ITEM_VIEW_TYPE_HEADER_OR_FOOTER;
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}
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@Override
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public int getViewTypeCount() {
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if (mAdapter != null) {
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return mAdapter.getViewTypeCount() + 1;
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}
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return 2;
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}
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@Override
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public void registerDataSetObserver(DataSetObserver observer) {
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mDataSetObservable.registerObserver(observer);
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if (mAdapter != null) {
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mAdapter.registerDataSetObserver(observer);
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}
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}
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@Override
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public void unregisterDataSetObserver(DataSetObserver observer) {
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mDataSetObservable.unregisterObserver(observer);
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if (mAdapter != null) {
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mAdapter.unregisterDataSetObserver(observer);
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}
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}
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@Override
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public Filter getFilter() {
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if (mIsFilterable) {
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return ((Filterable) mAdapter).getFilter();
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}
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return null;
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}
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@Override
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public ListAdapter getWrappedAdapter() {
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return mAdapter;
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}
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public void notifyDataSetChanged() {
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mDataSetObservable.notifyChanged();
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}
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}
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}
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