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InteractivePan Event

Summary

Occurs when the user performs interactive panning of the image display.

Syntax

C++

public event EventHandler<RasterViewerLineEventArgs> InteractivePan

Public Event InteractivePan As EventHandler(Of RasterViewerLineEventArgs)

public: 
event EventHandler<RasterViewerLineEventArgs^>^ InteractivePan

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.

Property	Description
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.

Remarks

Occurs when the InteractiveMode property is set to RasterViewerInteractiveMode.Pan or RasterViewerInteractiveMode.Scale.

Example

This sample changes the mouse cursor when panning, and displays the contents of the InteractivePan event in the console

Imports Leadtools.WinForms 
Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing.Color 
Imports Leadtools.Drawing 
 
Private Sub viewer_InteractivePan(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.Hand 
   ElseIf e.Status = RasterViewerInteractiveStatus.End Then 
      viewer.Cursor = Cursors.Default 
   End If 
   Console.WriteLine("InteractivePan: 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_InteractivePan(ByVal viewer As RasterImageViewer) 
   AddHandler viewer.InteractivePan, AddressOf viewer_InteractivePan 
   viewer.InteractiveMode = RasterViewerInteractiveMode.Pan 
 
   ' Do the panning 
 
   ' After you are done, you must remove the event handler as in below 
   ' viewer.InteractivePan -= new EventHandler<RasterViewerLineEventArgs>(viewer_InteractivePan); 
End Sub

using Leadtools.WinForms; 
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Drawing; 
 
private void viewer_InteractivePan(object sender, RasterViewerLineEventArgs e) 
{ 
   RasterImageViewer viewer = sender as RasterImageViewer; 
   if (e.Status == RasterViewerInteractiveStatus.Begin) 
      viewer.Cursor = Cursors.Hand; 
   else if (e.Status == RasterViewerInteractiveStatus.End) 
      viewer.Cursor = Cursors.Default; 
   Console.WriteLine("InteractivePan: e.Begin {0}, e.End{1}, e.Status {2}, e.Cancel {3}", e.Begin, e.End, e.Status, e.Cancel); 
} 
public void RasterImageViewer_InteractivePan(RasterImageViewer viewer) 
{ 
   viewer.InteractivePan += new EventHandler<RasterViewerLineEventArgs>(viewer_InteractivePan); 
   viewer.InteractiveMode = RasterViewerInteractiveMode.Pan; 
 
   // Do the panning 
 
   // After you are done, you must remove the event handler as in below 
   // viewer.InteractivePan -= new EventHandler<RasterViewerLineEventArgs>(viewer_InteractivePan); 
}