wxDataViewItem GetPrevItem( wxDataViewCtrl const& aView, wxDataViewItem const& aItem )
{
auto prevItem = GetPrevSibling( aView, aItem );
if( !prevItem.IsOk() )
{
prevItem = aView.GetModel()->GetParent( aItem );
}
else if( aView.IsExpanded( prevItem ) )
{
wxDataViewItemArray children;
aView.GetModel()->GetChildren( prevItem, children );
prevItem = children[children.size() - 1];
}
return prevItem;
}
wxDataViewItem GetNextItem( wxDataViewCtrl const& aView, wxDataViewItem const& aItem )
{
wxDataViewItem nextItem;
if( !aItem.IsOk() )
{
// No selection. Select the first.
wxDataViewItemArray children;
aView.GetModel()->GetChildren( aItem, children );
return children[0];
}
if( aView.IsExpanded( aItem ) )
{
wxDataViewItemArray children;
aView.GetModel()->GetChildren( aItem, children );
nextItem = children[0];
}
else
{
// Walk up levels until we find one that has a next sibling.
for( wxDataViewItem walk = aItem; walk.IsOk(); walk = aView.GetModel()->GetParent( walk ) )
{
nextItem = GetNextSibling( aView, walk );
if( nextItem.IsOk() )
break;
}
}
return nextItem;
}
wxDataViewItem GetNextSibling( wxDataViewCtrl const& aView, wxDataViewItem const& aItem )
{
wxDataViewItemArray siblings;
wxDataViewItem invalid;
wxDataViewItem parent = aView.GetModel()->GetParent( aItem );
aView.GetModel()->GetChildren( parent, siblings );
for( size_t i = 0; i < siblings.size(); ++i )
{
if( siblings[i] == aItem )
{
if( i == siblings.size() - 1 )
return invalid;
else
return siblings[i + 1];
}
}
return invalid;
}