private void SurfaceMouseMove(object sender, MouseEventArgs e)
{
bool clickable = selectedElements.ClickableAt(e.X, e.Y);
if (DrawingMode == DrawingModes.None && !clickable)
{
Cursor = Cursors.Default;
}
else if ((!mouseDown && clickable) || (mouseDown && mouseDownElement != null))
{
Cursor = Cursors.SizeAll;
}
else
{
Cursor = Cursors.Cross;
}
if (mouseDown)
{
if (mouseDownElement != null) // an element is currently dragged
{
selectedElements.HideGrippers();
if (mouseDownElement.Selected) // dragged element has been selected before -> move all
{
selectedElements.MoveBy(e.X - mX, e.Y - mY);
}
else // dragged element is not among selected elements -> just move dragged one
{
mouseDownElement.MoveBy(e.X - mX, e.Y - mY);
}
mX = e.X; mY = e.Y;
Invalidate();
}
else if (drawingElement != null) // an element is currently drawn
{
drawingElement.Width = e.X - drawingElement.Left;
drawingElement.Height = e.Y - drawingElement.Top;
Invalidate();
}
}
}
