void SurfaceMouseMove(object sender, MouseEventArgs e)
{
Point currentMouse = MouseHelper.FixMouseCoordinates(e);
if (DrawingMode != DrawingModes.None)
{
Cursor = Cursors.Cross;
}
else
{
Cursor = Cursors.Default;
}
if (mouseDown)
{
if (mouseDownElement != null) // an element is currently dragged
{
mouseDownElement.Invalidate();
selectedElements.HideGrippers();
// Move the element
if (mouseDownElement.Selected)
{
if (!isSurfaceMoveMadeUndoable)
{
// Only allow one undoable per mouse-down/move/up "cycle"
isSurfaceMoveMadeUndoable = true;
selectedElements.MakeBoundsChangeUndoable(false);
}
// dragged element has been selected before -> move all
selectedElements.MoveBy(currentMouse.X - mouseStart.X, currentMouse.Y - mouseStart.Y);
}
else
{
if (!isSurfaceMoveMadeUndoable)
{
// Only allow one undoable per mouse-down/move/up "cycle"
isSurfaceMoveMadeUndoable = true;
mouseDownElement.MakeBoundsChangeUndoable(false);
}
// dragged element is not among selected elements -> just move dragged one
mouseDownElement.MoveBy(currentMouse.X - mouseStart.X, currentMouse.Y - mouseStart.Y);
}
mouseStart = currentMouse;
mouseDownElement.Invalidate();
modified = true;
}
else if (drawingElement != null)
{
if (!drawingElement.HandleMouseMove(currentMouse.X, currentMouse.Y))
{
// an element is currently drawn
drawingElement.Invalidate();
drawingElement.Width = currentMouse.X - drawingElement.Left;
drawingElement.Height = currentMouse.Y - drawingElement.Top;
drawingElement.Invalidate();
}
modified = true;
}
}
}
