package com.xiangyixie.picshouse.view.pinnedHeaderListView;
import android.util.SparseArray;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import com.xiangyixie.picshouse.view.pinnedHeaderListView.PinnedHeaderListView.PinnedSectionedHeaderAdapter;
public abstract class SectionedBaseAdapter extends BaseAdapter implements PinnedSectionedHeaderAdapter {
private static int HEADER_VIEW_TYPE = 0;
private static int ITEM_VIEW_TYPE = 0;
/**
* Holds the calculated values of @{link getPositionInSectionForPosition}
*/
private SparseArray<Integer> mSectionPositionCache;
/**
* Holds the calculated values of @{link getSectionForPosition}
*/
private SparseArray<Integer> mSectionCache;
/**
* Holds the calculated values of @{link getCountForSection}
*/
private SparseArray<Integer> mSectionCountCache;
/**
* Caches the item count
*/
private int mCount;
/**
* Caches the section count
*/
private int mSectionCount;
public SectionedBaseAdapter() {
super();
mSectionCache = new SparseArray<Integer>();
mSectionPositionCache = new SparseArray<Integer>();
mSectionCountCache = new SparseArray<Integer>();
mCount = -1;
mSectionCount = -1;
}
@Override
public void notifyDataSetChanged() {
mSectionCache.clear();
mSectionPositionCache.clear();
mSectionCountCache.clear();
mCount = -1;
mSectionCount = -1;
super.notifyDataSetChanged();
}
@Override
public void notifyDataSetInvalidated() {
mSectionCache.clear();
mSectionPositionCache.clear();
mSectionCountCache.clear();
mCount = -1;
mSectionCount = -1;
super.notifyDataSetInvalidated();
}
@Override
public final int getCount() {
if (mCount >= 0) {
return mCount;
}
int count = 0;
for (int i = 0; i < internalGetSectionCount(); i++) {
count += internalGetCountForSection(i);
count++; // for the header view
}
mCount = count;
return count;
}
@Override
public final Object getItem(int position) {
return getItem(getSectionForPosition(position), getPositionInSectionForPosition(position));
}
@Override
public final long getItemId(int position) {
return getItemId(getSectionForPosition(position), getPositionInSectionForPosition(position));
}
@Override
public final View getView(int position, View convertView, ViewGroup parent) {
if (isSectionHeader(position)) {
return getSectionHeaderView(getSectionForPosition(position), convertView, parent);
}
return getItemView(getSectionForPosition(position), getPositionInSectionForPosition(position), convertView, parent);
}
@Override
public final int getItemViewType(int position) {
if (isSectionHeader(position)) {
return getItemViewTypeCount() + getSectionHeaderViewType(getSectionForPosition(position));
}
return getItemViewType(getSectionForPosition(position), getPositionInSectionForPosition(position));
}
@Override
public final int getViewTypeCount() {
return getItemViewTypeCount() + getSectionHeaderViewTypeCount();
}
public final int getSectionForPosition(int position) {
// first try to retrieve values from cache
Integer cachedSection = mSectionCache.get(position);
if (cachedSection != null) {
return cachedSection;
}
int sectionStart = 0;
for (int i = 0; i < internalGetSectionCount(); i++) {
int sectionCount = internalGetCountForSection(i);
int sectionEnd = sectionStart + sectionCount + 1;
if (position >= sectionStart && position < sectionEnd) {
mSectionCache.put(position, i);
return i;
}
sectionStart = sectionEnd;
}
return 0;
}
public int getPositionInSectionForPosition(int position) {
// first try to retrieve values from cache
Integer cachedPosition = mSectionPositionCache.get(position);
if (cachedPosition != null) {
return cachedPosition;
}
int sectionStart = 0;
for (int i = 0; i < internalGetSectionCount(); i++) {
int sectionCount = internalGetCountForSection(i);
int sectionEnd = sectionStart + sectionCount + 1;
if (position >= sectionStart && position < sectionEnd) {
int positionInSection = position - sectionStart - 1;
mSectionPositionCache.put(position, positionInSection);
return positionInSection;
}
sectionStart = sectionEnd;
}
return 0;
}
public final boolean isSectionHeader(int position) {
int sectionStart = 0;
for (int i = 0; i < internalGetSectionCount(); i++) {
if (position == sectionStart) {
return true;
} else if (position < sectionStart) {
return false;
}
sectionStart += internalGetCountForSection(i) + 1;
}
return false;
}
public int getItemViewType(int section, int position) {
return ITEM_VIEW_TYPE;
}
public int getItemViewTypeCount() {
return 1;
}
public int getSectionHeaderViewType(int section) {
return HEADER_VIEW_TYPE;
}
public int getSectionHeaderViewTypeCount() {
return 1;
}
public abstract Object getItem(int section, int position);
public abstract long getItemId(int section, int position);
public abstract int getSectionCount();
public abstract int getCountForSection(int section);
public abstract View getItemView(int section, int position, View convertView, ViewGroup parent);
public abstract View getSectionHeaderView(int section, View convertView, ViewGroup parent);
private int internalGetCountForSection(int section) {
Integer cachedSectionCount = mSectionCountCache.get(section);
if (cachedSectionCount != null) {
return cachedSectionCount;
}
int sectionCount = getCountForSection(section);
mSectionCountCache.put(section, sectionCount);
return sectionCount;
}
private int internalGetSectionCount() {
if (mSectionCount >= 0) {
return mSectionCount;
}
mSectionCount = getSectionCount();
return mSectionCount;
}
}