/// <summary>
/// This event handler is called when someone presses the mouse on a surface.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void SurfaceMouseDown(object sender, MouseEventArgs e)
{
_mouseStart = e.Location;
// check contextmenu
if (e.Button == MouseButtons.Right)
{
DrawableContainerList selectedList = null;
if (selectedElements != null && selectedElements.Count > 0)
{
selectedList = selectedElements;
}
else
{
// Single element
IDrawableContainer rightClickedContainer = _elements.ClickableElementAt(_mouseStart.X, _mouseStart.Y);
if (rightClickedContainer != null)
{
selectedList = new DrawableContainerList(ID);
selectedList.Add(rightClickedContainer);
}
}
if (selectedList != null && selectedList.Count > 0)
{
selectedList.ShowContextMenu(e, this);
}
return;
}
_mouseDown = true;
_isSurfaceMoveMadeUndoable = false;
if (_cropContainer != null && ((_undrawnElement == null) || (_undrawnElement != null && DrawingMode != DrawingModes.Crop)))
{
RemoveElement(_cropContainer, false);
_cropContainer = null;
_drawingElement = null;
}
if (_drawingElement == null && DrawingMode != DrawingModes.None)
{
if (_undrawnElement == null)
{
DeselectAllElements();
if (_undrawnElement == null)
{
CreateUndrawnElement();
}
}
_drawingElement = _undrawnElement;
// if a new element has been drawn, set location and register it
if (_drawingElement != null)
{
_drawingElement.Status = _undrawnElement.DefaultEditMode;
_drawingElement.PropertyChanged += ElementPropertyChanged;
if (!_drawingElement.HandleMouseDown(_mouseStart.X, _mouseStart.Y))
{
_drawingElement.Left = _mouseStart.X;
_drawingElement.Top = _mouseStart.Y;
}
AddElement(_drawingElement);
_drawingElement.Selected = true;
}
_undrawnElement = null;
}
else
{
// check whether an existing element was clicked
// we save mouse down element separately from selectedElements (checked on mouse up),
// since it could be moved around before it is actually selected
_mouseDownElement = _elements.ClickableElementAt(_mouseStart.X, _mouseStart.Y);
if (_mouseDownElement != null)
{
_mouseDownElement.Status = EditStatus.MOVING;
}
}
}
