OnPaint Method (RasterImagePanViewer)

C#
Visual Basic
Objective-C
Java
C++

protected override void OnPaint( 
   PaintEventArgs e
)

'Declaration
 
Protected Overrides Sub OnPaint( _
   ByVal e As PaintEventArgs _
)

'Usage
 
Dim instance As RasterImagePanViewer
Dim e As PaintEventArgs
 
instance.OnPaint(e)

protected:
void OnPaint( 
   PaintEventArgs^ e
) override

Parameters

e: A System.Windows.Forms.PaintEventArgs that contains information about the control to paint.

Raising an event invokes the event handler through a delegate.

The OnPaint method also allows derived classes to handle the event without attaching a delegate. This is the preferred technique for handling the event in a derived class.

Notes to Inheritors When overriding OnPaint in a derived class, be sure to call the base class's OnPaint method so that registered delegates receive the event.

This example overrides the virtual events of the RasterImagePanViewer class.

C#
Visual Basic
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Copy Code

Imports Leadtools.WinForms
Imports Leadtools
Imports Leadtools.Codecs

Public Class MyRasterImagePanViewer
   Inherits RasterImagePanViewer
   '.
   '.
   '.
   Protected Overrides Sub OnViewerChanged(ByVal e As EventArgs)
      MyBase.OnViewerChanged(e)
      Console.WriteLine("OnViewerChanged is called")
   End Sub

   Protected Overrides Sub OnRectangleColorChanged(ByVal e As EventArgs)
      MyBase.OnRectangleColorChanged(e)

      Console.WriteLine("OnRectangleColorChanged is called")
   End Sub

   Protected Overrides Sub OnImageColorChanged(ByVal e As EventArgs)
      MyBase.OnImageColorChanged(e)

      Console.WriteLine("OnImageColorChanged is called")
   End Sub

   Protected Overrides Sub OnClipCursorChanged(ByVal e As EventArgs)
      MyBase.OnClipCursorChanged(e)

      Console.WriteLine("OnClipCursorChanged is called")
   End Sub

   Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
      MyBase.OnPaint(e)

      Console.WriteLine("OnPaint is called")
   End Sub

   Protected Overrides Sub OnMouseDown(ByVal e As MouseEventArgs)
      MyBase.OnMouseDown(e)

      Console.WriteLine("OnMouseDown is called")
   End Sub

   Protected Overrides Sub OnMouseMove(ByVal e As MouseEventArgs)
      MyBase.OnMouseMove(e)

      Console.WriteLine("OnMouseMove is called")
   End Sub

   Protected Overrides Sub OnMouseUp(ByVal e As MouseEventArgs)
      MyBase.OnMouseUp(e)

      Console.WriteLine("OnMouseUp is called")
   End Sub

   Protected Overrides Sub OnLostFocus(ByVal e As EventArgs)
      MyBase.OnLostFocus(e)

      Console.WriteLine("OnLostFocus is called")
   End Sub

   Protected Overrides Sub OnSizeChanged(ByVal e As EventArgs)
      MyBase.OnSizeChanged(e)

      Console.WriteLine("OnSizeChanged is called")
   End Sub
End Class

using Leadtools.WinForms;
using Leadtools;
using Leadtools.Codecs;

public class MyRasterImagePanViewer : RasterImagePanViewer
{
   //.
   //.
   //.
   protected override void OnViewerChanged(EventArgs e)
   {
      base.OnViewerChanged(e);
      Console.WriteLine("OnViewerChanged is called");
   }

   protected override void OnRectangleColorChanged(EventArgs e)
   {
      base.OnRectangleColorChanged(e);

      Console.WriteLine("OnRectangleColorChanged is called");
   }

   protected override void OnImageColorChanged(EventArgs e)
   {
      base.OnImageColorChanged(e);

      Console.WriteLine("OnImageColorChanged is called");
   }

   protected override void OnClipCursorChanged(EventArgs e)
   {
      base.OnClipCursorChanged(e);

      Console.WriteLine("OnClipCursorChanged is called");
   }

   protected override void OnPaint(PaintEventArgs e)
   {
      base.OnPaint(e);

      Console.WriteLine("OnPaint is called");
   }

   protected override void OnMouseDown(MouseEventArgs e)
   {
      base.OnMouseDown(e);

      Console.WriteLine("OnMouseDown is called");
   }

   protected override void OnMouseMove(MouseEventArgs e)
   {
      base.OnMouseMove(e);

      Console.WriteLine("OnMouseMove is called");
   }

   protected override void OnMouseUp(MouseEventArgs e)
   {
      base.OnMouseUp(e);

      Console.WriteLine("OnMouseUp is called");
   }

   protected override void OnLostFocus(EventArgs e)
   {
      base.OnLostFocus(e);

      Console.WriteLine("OnLostFocus is called");
   }

   protected override void OnSizeChanged(EventArgs e)
   {
      base.OnSizeChanged(e);

      Console.WriteLine("OnSizeChanged is called");
   }
}

Target Platforms

Reference

RasterImagePanViewer Class
RasterImagePanViewer Members