void SurfaceMouseUp(object sender, MouseEventArgs e)
{
mouseDown = false;
mouseDownElement = null;
if (DrawingMode == DrawingModes.None) // check whether an existing element was clicked
{
DrawableContainer element = elements.ClickableElementAt(e.X, e.Y);
bool shiftModifier = (Control.ModifierKeys & Keys.Shift) == Keys.Shift;
if (element != null)
{
bool alreadySelected = selectedElements.Contains(element);
if (shiftModifier)
{
if (alreadySelected)
{
DeselectElement(element);
}
else
{
SelectElement(element);
}
}
else
{
if (!alreadySelected)
{
DeselectAllElements();
SelectElement(element);
}
}
}
else if (!shiftModifier)
{
DeselectAllElements();
}
}
if (selectedElements.Count > 0)
{
selectedElements.ShowGrippers();
selectedElements.Selected = true;
}
if (drawingElement != null)
{
if (!drawingElement.InitContent())
{
elements.Remove(drawingElement);
Invalidate();
}
else
{
if (Math.Abs(drawingElement.Width) < 5 && Math.Abs(drawingElement.Height) < 5)
{
drawingElement.Width = 25;
drawingElement.Height = 25;
}
SelectElement(drawingElement);
drawingElement.Selected = true;
}
drawingElement = null;
}
Invalidate();
}
