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  1. using System.Windows.Forms;
  2. using System.Windows.Forms.Design;
  3. using System.ComponentModel.Design;
  4. using System.ComponentModel;
  5. using System.Drawing;
  6.  
  7. // System.Design.dll の参照が必要です。
  8. // ClientProfile では追加できないので注意してください。
  9.  
  10. namespace WindowsFormsApplication1
  11. {
  12.     [Designer(typeof(MyControlDesigner))]
  13.     public class MyControl : FlowLayoutPanel
  14.     {
  15.         public MyControl()
  16.         {
  17.             this.Size = new Size(300, 200);
  18.  
  19.             this.ChildPanel = new ChildPanel();
  20.             this.ChildPanel.Size = new Size(100, 100);
  21.             this.Controls.Add(this.ChildPanel);
  22.         }
  23.  
  24.         [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
  25.         public ChildPanel ChildPanel { get; internal set; }
  26.     }
  27.     internal class MyControlDesigner : ParentControlDesigner
  28.     {
  29.         public override void Initialize(IComponent component)
  30.         {
  31.             base.Initialize(component);
  32.             MyControl myControl = (MyControl)component;
  33.             this.EnableDesignMode(myControl.ChildPanel, "ChildPanel");
  34.         }
  35.         protected override void OnPaintAdornments(PaintEventArgs pe)
  36.         {
  37.             base.OnPaintAdornments(pe);
  38.             Rectangle rect = this.Control.ClientRectangle;
  39.             rect.Inflate(-1, -1);
  40.             using (Pen pen = new Pen(Color.Gray))
  41.             {
  42.                 pen.DashStyle = System.Drawing.Drawing2D.DashStyle.Dash;
  43.                 pe.Graphics.DrawRectangle(pen, rect);
  44.             }
  45.         }
  46.     }
  47.  
  48.     [ToolboxItem(false)]
  49.     [Designer(typeof(ChildPanelDesigner))]
  50.     public class ChildPanel : FlowLayoutPanel { }
  51.  
  52.     public class ChildPanelDesigner : ParentControlDesigner
  53.     {
  54.         public override SelectionRules SelectionRules
  55.         {
  56.             get
  57.             {
  58.                 return base.SelectionRules & ~SelectionRules.Moveable;
  59.             }
  60.         }
  61.  
  62.         protected override void OnPaintAdornments(PaintEventArgs pe)
  63.         {
  64.             base.OnPaintAdornments(pe);
  65.             Rectangle rect = this.Control.ClientRectangle;
  66.             rect.Inflate(-1, -1);
  67.             using (Pen pen = new Pen(Color.Gray))
  68.             {
  69.                 pen.DashStyle = System.Drawing.Drawing2D.DashStyle.Dash;
  70.                 pe.Graphics.DrawRectangle(pen, rect);
  71.             }
  72.         }
  73.         public override bool CanBeParentedTo(IDesigner parentDesigner)
  74.         {
  75.             return (parentDesigner is MyControlDesigner);
  76.         }
  77.     }
  78. }
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https://ideone.com/VPhnm
language:
C# (gmcs 5.20.1)
created:
12 years ago
visibility:
public

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