public override View GetView(int position, View convertView, ViewGroup parent)
{
var wrapperView = (convertView == null) ? new WrapperView(m_Context) : convertView as WrapperView;
if (wrapperView == null)
{
throw new NullReferenceException("Wrapper view can not be null");
}
var item = Delegate.GetView(position, wrapperView.Item, wrapperView);
View header = null;
if (PreviousPositionHasSameHeader(position))
{
RecycleHeaderIfExists(wrapperView);
}
else
{
header = ConfigureHeader(wrapperView, position);
}
if ((item is ICheckable) && !(wrapperView is CheckableWrapperView))
{
//Need to create Checkable subclass of WrapperView for listview to work correctly
wrapperView = new CheckableWrapperView(m_Context);
}
else if (!(item is ICheckable) && (wrapperView is CheckableWrapperView))
{
wrapperView = new WrapperView(m_Context);
}
wrapperView.Update(item, header, Divider, DividerHeight);
return(wrapperView);
}
/// <summary>
/// Will recycle header from WrapperView if it exists
/// </summary>
/// <param name="wrapperView">wrapper view where header exists</param>
private void RecycleHeaderIfExists(WrapperView wrapperView)
{
var header = wrapperView.Header;
if (header != null)
{
m_HeaderCache.Add(header);
}
}
/// <summary>
/// Get a header view. This optionally pulls a header from the supplied
/// Wrapper view and will also recycle it if it exists
/// </summary>
/// <param name="wrapperView">Wrapper view to pull header from</param>
/// <param name="position">Position of the header</param>
/// <returns>New Header view</returns>
private View ConfigureHeader(WrapperView wrapperView, int position)
{
var header = wrapperView.Header ?? PopHeader();
header = Delegate.GetHeaderView(position, header, wrapperView);
if (header == null)
{
throw new NullPointerException("Header view must not be null.");
}
header.Clickable = true;
header.Click += (sender, args) =>
{
if (OnHeaderAdapterClickListener == null)
{
return;
}
var headerId = Delegate.GetHeaderId(position);
OnHeaderAdapterClickListener.OnHeaderClick((View)sender, position, headerId);
};
return(header);
}
/// <summary>
/// Get a header view. This optionally pulls a header from the supplied
/// Wrapper view and will also recycle it if it exists
/// </summary>
/// <param name="wrapperView">Wrapper view to pull header from</param>
/// <param name="position">Position of the header</param>
/// <returns>New Header view</returns>
private View ConfigureHeader(WrapperView wrapperView, int position)
{
var header = wrapperView.Header ?? PopHeader();
header = Delegate.GetHeaderView(position, header, wrapperView);
if(header == null)
throw new NullPointerException("Header view must not be null.");
header.Clickable = true;
header.Click += (sender, args) =>
{
if (OnHeaderAdapterClickListener == null)
return;
var headerId = Delegate.GetHeaderId(position);
OnHeaderAdapterClickListener.OnHeaderClick((View)sender, position, headerId);
};
return header;
}
/// <summary>
/// Will recycle header from WrapperView if it exists
/// </summary>
/// <param name="wrapperView">wrapper view where header exists</param>
private void RecycleHeaderIfExists(WrapperView wrapperView)
{
var header = wrapperView.Header;
if(header != null)
m_HeaderCache.Add(header);
}
public override View GetView(int position, View convertView, ViewGroup parent)
{
var wrapperView = (convertView == null) ? new WrapperView(m_Context) : convertView as WrapperView;
if(wrapperView == null)
throw new NullReferenceException("Wrapper view can not be null");
var item = Delegate.GetView(position, wrapperView.Item, wrapperView);
View header = null;
if (PreviousPositionHasSameHeader(position))
{
RecycleHeaderIfExists(wrapperView);
}
else
{
header = ConfigureHeader(wrapperView, position);
}
if ((item is ICheckable) && !(wrapperView is CheckableWrapperView))
{
//Need to create Checkable subclass of WrapperView for listview to work correctly
wrapperView = new CheckableWrapperView(m_Context);
}
else if (!(item is ICheckable) && (wrapperView is CheckableWrapperView))
{
wrapperView = new WrapperView(m_Context);
}
wrapperView.Update(item, header, Divider, DividerHeight);
return wrapperView;
}