protected override void OnMouseUp(MouseEventArgs e)
{
base.OnMouseUp(e);
if (mStage == MouseStage.Outside)
{
FenceRect = GetFenceRect(MouseDownPt, new SizeF(MouseMovePt.X - MouseDownPt.X, MouseMovePt.Y - MouseDownPt.Y));
}
mStage = MouseStage.NoAction;
Invalidate();
}
protected override void OnMouseDown(MouseEventArgs e)
{
base.OnMouseDown(e);
mStage = GetMouseOverType(e.X, e.Y);
if (mStage == MouseStage.Outside)
{
MouseDownPt = e.Location;
MouseMovePt = e.Location;
}
else if (mStage == MouseStage.Fence || mStage == MouseStage.Handle) // mouse down on rectangle or handle begine moving
{
MouseDownPt = FenceRect.Location;
MouseDownOffsetPt.X = e.X - FenceRect.X;
MouseDownOffsetPt.Y = e.Y - FenceRect.Y;
}
}
protected override void OnMouseMove(MouseEventArgs e)
{
base.OnMouseMove(e);
MouseMovePt = e.Location;
if (mStage != MouseStage.NoAction)
{
float dx, dy;
if (mStage == MouseStage.Outside) // drawing rectangle
{
FenceRect = GetFenceRect(MouseDownPt, new SizeF(MouseMovePt.X - MouseDownPt.X, MouseMovePt.Y - MouseDownPt.Y));
}
else if (mStage == MouseStage.Fence) // moving fence
{
dx = e.X - MouseDownPt.X;
dy = e.Y - MouseDownPt.Y;
FenceRect.X = MouseDownPt.X + dx - MouseDownOffsetPt.X;
FenceRect.Y = MouseDownPt.Y + dy - MouseDownOffsetPt.Y;
}
else if (mStage == MouseStage.Handle) // moving handle
{
FenceRect.Width = Math.Abs(FenceRect.X - e.X);
FenceRect.Height = Math.Abs(FenceRect.Y - e.Y);
}
Invalidate();
}
else
{
MouseStage stage = GetMouseOverType(e.X, e.Y);
if (stage == MouseStage.Fence)
{
base.Cursor = Cursors.Hand;
}
else if (stage == MouseStage.Handle)
{
base.Cursor = Cursors.SizeNESW;
}
else
{
base.Cursor = Cursors.Default;
}
}
}