private void SelectItem(ThumbnailControlItem item, bool toggle, HashSet <ThumbnailControlItem> selected)
{
if (toggle)
{
if (selected.Contains(item))
{
m_selection.Remove(item);
}
else
{
m_selection.Add(item);
}
}
else if (!selected.Contains(item))
{
m_selection.Add(item);
}
}
/// <summary>
/// Raises the MouseMove event</summary>
/// <param name="e">Event args</param>
protected override void OnMouseMove(MouseEventArgs e)
{
if (e.Button == MouseButtons.None)
{
ThumbnailControlItem thumbnail = PickThumbnail(new Point(e.X, e.Y));
if (thumbnail != m_hoverThumbnail)
{
m_hoverThumbnail = thumbnail;
m_hoverTimer.Start();
}
}
if (m_multiSelecting)
{
m_mousePt = e.Location;
Invalidate();
}
base.OnMouseMove(e);
}
/// <summary>
/// Raises the MouseUp event</summary>
/// <param name="e">Event args</param>
protected override void OnMouseUp(MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
// extend/toggle selection?
bool extend = (ModifierKeys & Keys.Shift) != 0;
bool toggle = (ModifierKeys & Keys.Control) != 0;
if (!extend && !toggle)
{
m_selection.Clear();
}
HashSet <ThumbnailControlItem> selected = new HashSet <ThumbnailControlItem>(m_selection);
if (m_multiSelecting)
{
m_multiSelecting = false;
IEnumerable <ThumbnailControlItem> picked = Pick(GetSelectionRect());
foreach (ThumbnailControlItem item in picked)
{
SelectItem(item, toggle, selected);
}
}
else
{
ThumbnailControlItem item = PickThumbnail(e.Location);
if (item != null)
{
SelectItem(item, toggle, selected);
}
}
OnSelectionChanged(EventArgs.Empty);
Invalidate();
}
base.OnMouseUp(e);
EndHover();
}