/// <summary>
/// Performs custom actions on MouseDown events</summary>
/// <param name="e">Mouse event args</param>
protected override void OnMouseDown(MouseEventArgs e)
{
// If there is an ISelectionContext implemented for the type of our search results,
// and the mouse click was on one of the search result list items,
// then have that ISelectionContext select the instance associated with the clicked search result.
// Additionally, if the type of our search results implements an ISubSelectionContext, have
// that ISubSelectionContext select the instance associated with the subitem of the clicked search results
//
// (For instance, when each search result ListItem is a DomNode, and contains a SubItem for every DomNode
// property that matched, this would allow both setting ISelectionContext to the DomNode associated with
// the clicked ListItem, and setting ISubSelectionContext to the property associated with the clicked SubItem
// in the row)
if (m_queryResultContext != null)
{
// Is the query result type associated with m_queryResultContext have a way of specifying a selection was made?
ISelectionContext selectionContext = m_queryResultContext.As <ISelectionContext>();
if (selectionContext != null)
{
// We can specify a selection was made. Now check if a selection was actually made.
ListViewHitTestInfo hitTestInfo = HitTest(e.Location);
if (hitTestInfo != null && hitTestInfo.Item != null)
{
// A selection was made in the search results. Specify this selection through ISelectionContext.
object tag = hitTestInfo.Item.Tag;
selectionContext.Set(tag);
// Does the query result type also have a way to specify a sub-selection?
ISubSelectionContext subSelectionContext = m_queryResultContext.As <ISubSelectionContext>();
if (subSelectionContext != null)
{
object selectedTag = null;
if (hitTestInfo.SubItem != null && hitTestInfo.SubItem.Tag != null)
{
selectedTag = hitTestInfo.SubItem.Tag; // Specific sub-item clicked, use it
}
else
{
// No sub-item clicked, select first sub-item if the selected item has any
foreach (var obj in hitTestInfo.Item.SubItems)
{
var subItem = obj as ListViewItem.ListViewSubItem;
if (subItem != null && subItem.Tag != null)
{
selectedTag = subItem.Tag;
break;
}
}
}
if (selectedTag != null)
{
subSelectionContext.Set(selectedTag);
}
else
{
subSelectionContext.Clear();
}
}
}
else // no selection
{
selectionContext.Clear();
}
}
}
}