LEADTOOLS Windows Forms (Leadtools.WinForms assembly) Send comments on this topic. | Back to Introduction - All Topics | Help Version 17.0.3.30
InteractiveMagnifyGlass Event
See Also 
Leadtools.WinForms Namespace > RasterImageViewer Class : InteractiveMagnifyGlass Event



Occurs when the user is using the MagnifyGlass.

Syntax

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

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 magnify parts of the image. Also, it displays the contents of the InteractiveMagnifyGlass event in the console

Visual BasicCopy Code
Private Sub viewer_InteractiveMagnifyGlass(ByVal sender As Object, ByVal e As RasterViewerLineEventArgs)
   If e.Status = RasterViewerInteractiveStatus.Begin Then
      System.Windows.Forms.Cursor.Hide()
   ElseIf e.Status = RasterViewerInteractiveStatus.End Then
      System.Windows.Forms.Cursor.Show()
   End If
   Console.WriteLine("InteractiveMagnifyGlass: 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_InteractiveMagnifyGlass(ByVal viewer As RasterImageViewer)
   viewer.InteractiveMode = RasterViewerInteractiveMode.MagnifyGlass
   AddHandler viewer.InteractiveMagnifyGlass, AddressOf viewer_InteractiveMagnifyGlass

   ' Drag mouse across image to see the magnifying glass
   ' After you are done, you must remove the event handler as in below
   '
   ' viewer.InteractiveMagnifyGlass -= new EventHandler<RasterViewerLineEventArgs>(viewer_InteractiveMagnifyGlass);
End Sub
C#Copy Code
private void viewer_InteractiveMagnifyGlass(object sender, RasterViewerLineEventArgs e)
{
   if (e.Status == RasterViewerInteractiveStatus.Begin)
      System.Windows.Forms.Cursor.Hide();
   else if (e.Status == RasterViewerInteractiveStatus.End)
      System.Windows.Forms.Cursor.Show();
   Console.WriteLine("InteractiveMagnifyGlass: e.Begin {0}, e.End{1}, e.Status {2}, e.Cancel {3}", e.Begin, e.End, e.Status, e.Cancel);
}
public void RasterImageViewer_InteractiveMagnifyGlass(RasterImageViewer viewer)
{
   viewer.InteractiveMode = RasterViewerInteractiveMode.MagnifyGlass;
   viewer.InteractiveMagnifyGlass += new EventHandler<RasterViewerLineEventArgs>(viewer_InteractiveMagnifyGlass);

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

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