public Overlayer(HostFrame themainhost)
{
_themainhost = themainhost; //默认被操作的是控件容器
Rectangle r = _themainhost.Bounds;
r = _themainhost.Parent.RectangleToScreen(r);
r = this.RectangleToClient(r);
_recter.Rect = r;
_recter.IsForm = true;
InitializeComponent();
}
public Overlayer _overlayer;//对父容器可见
public DesignerControl()
{
InitializeComponent();
_hostFrame = new HostFrame();
_hostFrame.TopLevel = false; //当做子控件添加到设计面板
_hostFrame.Location = new Point(10, 10);
_hostFrame.Text = "设计界面";
Controls.Add(_hostFrame);
_hostFrame.Show();
_overlayer = new Overlayer(_hostFrame);
_overlayer.Location = new Point(0, 0);
_overlayer.Dock = DockStyle.Fill;
Controls.Add(_overlayer);
_overlayer.Show();
_overlayer.BringToFront(); //将其设置Z轴最上，接受所有的用户操作，底层的其他控件无法接受用户输入。各位可以注释这条试一下，底层的其他控件（窗体）就能接受鼠标点击
Application.AddMessageFilter(new MessageFilter(_hostFrame, this)); // 过滤控件容器中所有子控件的WM_PAINT消息 减少重绘操作
SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.OptimizedDoubleBuffer, true);
}
public MessageFilter(HostFrame hostFrame, DesignerControl designer)
{
_thehost = hostFrame;
_theDesignerBoard = designer;
}