public void SetStrategy(SelectStrategy s)
{
lock (Locker)
{
SelectStrategy = s;
s.SetZoomController(this);
}
}
private void DragDetector_MouseUp(Point obj)
{
if (!SelectStrategy.IsRectBigEnough(coverRect, Mapper))
{
UpdateView();
}
else
{
var left = Mapper.GetCoordinateX(coverRect.Left);
var right = Mapper.GetCoordinateX(coverRect.Right);
var top = Mapper.GetCoordinateY(coverRect.Top);
var bottom = Mapper.GetCoordinateY(coverRect.Bottom);
SetMapperRange(left, right, top, bottom);
}
//此处必须清零coverRect，原因是：当鼠标只做点击不拖动时，coverRect会保留上次放缩时计算的CoverRect值，因此会通过IsRectBigEnough的校验
coverRect = new Rectangle(0, 0, 0, 0);
return;
}
private void DragDetector_MouseDrag(Point arg1, Point arg2)
{
coverRect = SelectStrategy.CalRect(arg1, arg2);
UpdateView();
}
public ZoomController(SelectStrategy selectStrategy)
{
SelectStrategy = selectStrategy;
SelectStrategy.SetZoomController(this);
}
protected override void DrawElement(RenderTarget rt)
{
SelectStrategy.DrawZoomView(coverRect.ToRectF(), rt, fillBrush, frameBrush, 2);
}