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InteractiveScale Event
See Also 
Leadtools.WinForms Namespace > RasterImageViewer Class : InteractiveScale Event



Occurs when the user performs interactive change of the current scale factor using the mouse.

Syntax

Visual Basic (Declaration) 
Public Event InteractiveScale As EventHandler(Of RasterViewerLineEventArgs)
Visual Basic (Usage)Copy Code
Dim instance As RasterImageViewer
Dim handler As EventHandler(Of RasterViewerLineEventArgs)
 
AddHandler instance.InteractiveScale, handler
C# 
public event EventHandler<RasterViewerLineEventArgs> InteractiveScale
C++/CLI 
public:
event EventHandler<RasterViewerLineEventArgs^>^ InteractiveScale

Event Data

The event handler receives an argument of type RasterViewerLineEventArgs containing data related to this event. The following RasterViewerLineEventArgs properties provide information specific to this event.

PropertyDescription
Begin Returns the beginning point for the current interactive mode line.
Cancel (Inherited from Leadtools.WinForms.RasterViewerInteractiveEventArgs)Gets or sets a value indicating whether the interactive mode should be canceled.
End Returns the end point for the current interactive mode line.
Status (Inherited from Leadtools.WinForms.RasterViewerInteractiveEventArgs)Gets the current status of the interactive mode.

Example

This sample lets you drag the mouse to scale an image. Also, it displays the contents of the InteractiveScale event in the console

Visual BasicCopy Code
Private Sub viewer_InteractiveScale(ByVal sender As Object, ByVal e As RasterViewerLineEventArgs)
   Dim viewer As RasterImageViewer = CType(IIf(TypeOf sender Is RasterImageViewer, sender, Nothing), RasterImageViewer)
   If e.Status = RasterViewerInteractiveStatus.Begin Then
      viewer.Cursor = Cursors.SizeAll
   ElseIf e.Status = RasterViewerInteractiveStatus.End Then
      viewer.Cursor = Cursors.Default
   End If
   Console.WriteLine("InteractiveScale: e.Begin {0}, e.End{1}, e.Status {2}, e.Cancel {3}", e.Begin, e.End, e.Status, e.Cancel)
End Sub
Public Sub RasterImageViewer_InteractiveScale(ByVal viewer As RasterImageViewer)
   viewer.InteractiveMode = RasterViewerInteractiveMode.Scale
   AddHandler viewer.InteractiveScale, AddressOf viewer_InteractiveScale

   ' Drag mouse across image to scale the image
   ' After you are done, you must remove the event handler as in below
   '
   ' viewer.InteractiveScale -= new EventHandler<RasterViewerLineEventArgs>(viewer_InteractiveScale);
End Sub
C#Copy Code
private void viewer_InteractiveScale(object sender, RasterViewerLineEventArgs e)
{
   RasterImageViewer viewer = sender as RasterImageViewer;
   if (e.Status == RasterViewerInteractiveStatus.Begin)
      viewer.Cursor = Cursors.SizeAll;
   else if (e.Status == RasterViewerInteractiveStatus.End)
      viewer.Cursor = Cursors.Default;
   Console.WriteLine("InteractiveScale: e.Begin {0}, e.End{1}, e.Status {2}, e.Cancel {3}", e.Begin, e.End, e.Status, e.Cancel);
}
public void RasterImageViewer_InteractiveScale(RasterImageViewer viewer)
{
   viewer.InteractiveMode = RasterViewerInteractiveMode.Scale;
   viewer.InteractiveScale += new EventHandler<RasterViewerLineEventArgs>(viewer_InteractiveScale);

   // Drag mouse across image to scale the image
   // After you are done, you must remove the event handler as in below
   //
   // viewer.InteractiveScale -= new EventHandler<RasterViewerLineEventArgs>(viewer_InteractiveScale);
}

Remarks

Requirements

Target Platforms: Microsoft .NET Framework 2.0, Windows 2000, Windows XP, Windows Server 2003 family, Windows Server 2008 family, Windows Vista, Windows 7

See Also