protected View getHeaderView(int position, View convertView, ViewGroup parent) {
if (mDelegate.getNumHeaders() == 0) {
return null;
}
return mDelegate.getHeaderView(translatePosition(position).mHeader, convertView, parent);
}
protected void updateCount() {
mCount = 0;
int numHeaders = mDelegate.getNumHeaders();
if (numHeaders == 0) {
mCount = mDelegate.getCount();
mCounted = true;
return;
}
for (int i = 0; i < numHeaders; i++) {
mCount += mDelegate.getCountForHeader(i) + mNumColumns;
}
mCounted = true;
}
protected Position translatePosition(int position) {
int numHeaders = mDelegate.getNumHeaders();
if (numHeaders == 0) {
if (position >= mDelegate.getCount()) {
return new Position(POSITION_FILLER, 0);
}
return new Position(position, 0);
}
// Translate GridView position to Adapter position.
int adapterPosition = position;
int place = position;
int i;
for (i = 0; i < numHeaders; i++) {
int sectionCount = mDelegate.getCountForHeader(i);
// Skip past fake items making space for header in front of
// sections.
if (place == 0) {
// Position is first column where header will be.
return new Position(POSITION_HEADER, i);
}
place -= mNumColumns;
if (place < 0) {
// Position is a fake so return null.
return new Position(POSITION_HEADER_FILLER, i);
}
adapterPosition -= mNumColumns;
if (place < sectionCount) {
return new Position(adapterPosition, i);
}
// Skip past section end of section row filler;
int filler = unFilledSpacesInHeaderGroup(i);
adapterPosition -= filler;
place -= sectionCount + filler;
if (place < 0) {
// Position is a fake so return null.
return new Position(POSITION_FILLER, i);
}
}
// Position is a fake.
return new Position(POSITION_FILLER, i);
}
public StickyGridHeadersBaseAdapterWrapper(
Context context, StickyGridHeadersGridView gridView, StickyGridHeadersBaseAdapter delegate) {
mContext = context;
mDelegate = delegate;
mGridView = gridView;
delegate.registerDataSetObserver(mDataSetObserver);
}
/**
* Counts the number of items that would be need to fill out the last row in the group of items
* with the given header.
*
* @param header Header set of items are grouped by.
* @return The count of unfilled spaces in the last row.
*/
private int unFilledSpacesInHeaderGroup(int header) {
// If mNumColumns is equal to zero we will have a divide by 0 exception
if (mNumColumns == 0) {
return 0;
}
int remainder = mDelegate.getCountForHeader(header) % mNumColumns;
return remainder == 0 ? 0 : mNumColumns - remainder;
}
@Override
public boolean isEnabled(int position) {
Position adapterPosition = translatePosition(position);
if (adapterPosition.mPosition == POSITION_FILLER
|| adapterPosition.mPosition == POSITION_HEADER) {
return false;
}
return mDelegate.isEnabled(adapterPosition.mPosition);
}
/**
* Get the data item associated with the specified position in the data set.
*
* <p>Since this wrapper inserts fake entries to fill out items grouped by header and also spaces
* to insert headers into some positions will return null.
*
* @param position Position of the item whose data we want within the adapter's data set.
* @return The data at the specified position.
*/
@Override
public Object getItem(int position) throws ArrayIndexOutOfBoundsException {
Position adapterPosition = translatePosition(position);
if (adapterPosition.mPosition == POSITION_FILLER
|| adapterPosition.mPosition == POSITION_HEADER) {
// Fake entry in view.
return null;
}
return mDelegate.getItem(adapterPosition.mPosition);
}
@Override
public int getCount() {
if (mCounted) {
return mCount;
}
mCount = 0;
int numHeaders = mDelegate.getNumHeaders();
if (numHeaders == 0) {
mCount = mDelegate.getCount();
mCounted = true;
return mCount;
}
for (int i = 0; i < numHeaders; i++) {
// Pad count with space for header and trailing filler in header
// group.
mCount += mDelegate.getCountForHeader(i) + unFilledSpacesInHeaderGroup(i) + mNumColumns;
}
mCounted = true;
return mCount;
}
@Override
public long getItemId(int position) {
Position adapterPosition = translatePosition(position);
if (adapterPosition.mPosition == POSITION_HEADER) {
return ID_HEADER;
}
if (adapterPosition.mPosition == POSITION_FILLER) {
return ID_FILLER;
}
if (adapterPosition.mPosition == POSITION_HEADER_FILLER) {
return ID_HEADER_FILLER;
}
return mDelegate.getItemId(adapterPosition.mPosition);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
Position adapterPosition = translatePosition(position);
if (adapterPosition.mPosition == POSITION_HEADER) {
HeaderFillerView v = getHeaderFillerView(adapterPosition.mHeader, convertView, parent);
View view = mDelegate.getHeaderView(adapterPosition.mHeader, (View) v.getTag(), parent);
mGridView.detachHeader((View) v.getTag());
v.setTag(view);
mGridView.attachHeader(view);
convertView = v;
mLastHeaderViewSeen = v;
v.forceLayout();
} else if (adapterPosition.mPosition == POSITION_HEADER_FILLER) {
convertView = getFillerView(convertView, parent, mLastHeaderViewSeen);
convertView.forceLayout();
} else if (adapterPosition.mPosition == POSITION_FILLER) {
convertView = getFillerView(convertView, parent, mLastViewSeen);
} else {
convertView = mDelegate.getView(adapterPosition.mPosition, convertView, parent);
mLastViewSeen = convertView;
}
return convertView;
}
@Override
public int getItemViewType(int position) {
Position adapterPosition = translatePosition(position);
if (adapterPosition.mPosition == POSITION_HEADER) {
return VIEW_TYPE_HEADER;
}
if (adapterPosition.mPosition == POSITION_FILLER) {
return VIEW_TYPE_FILLER;
}
if (adapterPosition.mPosition == POSITION_HEADER_FILLER) {
return VIEW_TYPE_HEADER_FILLER;
}
int itemViewType = mDelegate.getItemViewType(adapterPosition.mPosition);
if (itemViewType == IGNORE_ITEM_VIEW_TYPE) {
return itemViewType;
}
return itemViewType + sNumViewTypes;
}
@Override
public void unregisterDataSetObserver(DataSetObserver observer) {
super.unregisterDataSetObserver(observer);
mDelegate.unregisterDataSetObserver(observer);
}
@Override
public boolean isEmpty() {
return mDelegate.isEmpty();
}
@Override
public boolean hasStableIds() {
return mDelegate.hasStableIds();
}
@Override
public int getViewTypeCount() {
return mDelegate.getViewTypeCount() + sNumViewTypes;
}
