Windows Forms: Custom Controls

So Similar to the Tutorial's Custom Control ...

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• A custom control displaying 4 points and the gradient between them:
  • Points (drawn as small rectangles filled with proper colours, see the picture) define a polygon
  • The polygon is filled using the PathGradientBrush
  • Colours and positions of points can be changed in the Properties window
  • Positions of points can be changed using simple dragging points in the design view of the form
• Implementation details:
  • The Custom Control (inherited from the System.Windows.Forms.Control class)
  • The control has 2 special properties in a special "Points & Colors" group (see the picture above)
    • Colors - colours of points (of the Color[4] type)
    • Points - Point[4] type (see below)
• Points' property editor:
• Use the Editor attribute
• The class of the editor must be inherited from the UITypeEditor class
• Override the following methods:
  • EditValue
  • GetEditStyle (use the UITypeEditorEditStyle.DropDown style)
• A control used for edition of this property is of the same type as the control being edited
• The user can move points using the mouse
• Create a Windows Forms Application for testing the custom control
  • A simple form with one custom control
• Hints:
  • The Custom Control:
    • Component.DesignMode
    • the UITypeEditor class
    • the ControlDesigner class
    • attributes: Browsable, Category, Editor
  • Drawing the gradient:
    • PathGradientBrush: SurroundColors
    • Graphics: FillRectangle, DrawRectangle

• Approximate points:
  • the custom control:
    • properties (and their attributes): 1.5
    • drawing (the gradient and points): 1.5
    • moving points: 1.5
  • the testing Windows Forms Application: 1.5
  • the editor of the Points property (extending the UITypeEditor class): 1.5
  • the control's designer (extending the ControlDesigner class): 2.5

• Links for uploading:
  • Solutions
  • Corrections