public void SetAllVisibleState(bool visible)
{
foreach (var v in Items)
{
if (v is MeshListItem mesh)
{
mesh.Visible = visible;
}
}
ItemVisiblilityChanged?.Invoke(this, new EventArgs());
Invalidate();
}
public void SetVisibleState(int index, bool visible)
{
if (index < Items.Count && index >= 0)
{
if (Items[index] is MeshListItem mesh)
{
mesh.Visible = visible;
}
}
ItemVisiblilityChanged?.Invoke(this, new EventArgs());
Invalidate();
}
public MeshList() : base()
{
//Activate double buffering
this.SetStyle(ControlStyles.OptimizedDoubleBuffer | ControlStyles.AllPaintingInWmPaint, true);
//Enable the OnNotifyMessage event so we get a chance to filter out
// Windows messages before they get to the form's WndProc
this.SetStyle(ControlStyles.EnableNotifyMessage, true);
this.DrawMode = DrawMode.OwnerDrawFixed;
this.DrawItem += Ditem;
HashSet <int> _selIndex = new HashSet <int>();
HashSet <int> _newSet = new HashSet <int>();
bool updating = false;
SelectedIndexChanged += (sender, args) =>
{
if (updating)
{
return;
}
var mpos = PointToClient(Cursor.Position);
var index = IndexFromPoint(mpos);
if (index != -1 &&
Items[index] is MeshListItem checkable &&
mpos.X < ItemHeight)
{
// undo selection
_newSet.Clear();
foreach (int i in SelectedIndices)
{
_newSet.Add(i);
}
if (!_newSet.SetEquals(_selIndex))
{
updating = true;
BeginUpdate();
SelectedIndices.Clear();
SelectedIndex = -1;
foreach (var v in _selIndex)
{
SelectedIndices.Add(v);
}
EndUpdate();
updating = false;
}
// toggle visibility
{
if (SelectedIndices.Contains(index))
{
bool state = !checkable.Visible;
foreach (var s in SelectedItems)
{
if (s is MeshListItem mesh)
{
mesh.Visible = state;
}
}
}
else
{
checkable.Visible = !checkable.Visible;
}
ItemVisiblilityChanged?.Invoke(this, new EventArgs());
Invalidate();
}
return;
}
_selIndex.Clear();
foreach (int v in SelectedIndices)
{
_selIndex.Add(v);
}
};
}
