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InteractivePage Event

Summary

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

Syntax

C++

public event EventHandler<RasterViewerLineEventArgs> InteractivePage

  
Public Event InteractivePage As EventHandler(Of RasterViewerLineEventArgs)

public: 
event EventHandler<RasterViewerLineEventArgs^>^ InteractivePage

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

Only occurs when the InteractiveMode property is set to RasterViewerInteractiveMode.Page.

Example

This sample loads all pages of a multipage file into the viewer, and lets you drag the mouse to view the pages. Also, it displays the contents of the InteractivePage event in the console

using Leadtools.WinForms; 
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Drawing; 
 
private void viewer_InteractivePage(object sender, RasterViewerLineEventArgs e) 
{ 
   RasterImageViewer viewer = sender as RasterImageViewer; 
   if (e.Status == RasterViewerInteractiveStatus.Begin) 
      viewer.Cursor = Cursors.SizeNS; 
   else if (e.Status == RasterViewerInteractiveStatus.End) 
      viewer.Cursor = Cursors.Default; 
   Console.WriteLine("InteractivePage: e.Begin {0}, e.End{1}, e.Status {2}, e.Cancel {3}", e.Begin, e.End, e.Status, e.Cancel); 
} 
 
public void RasterImageViewer_InteractivePage(RasterImageViewer viewer) 
{ 
   // Load a multipage file 
   RasterCodecs codecs = new RasterCodecs(); 
   viewer.Image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "eye.gif")); 
   codecs.Dispose(); 
 
   viewer.InteractiveMode = RasterViewerInteractiveMode.Page; 
   viewer.InteractivePage += new EventHandler<RasterViewerLineEventArgs>(viewer_InteractivePage); 
 
   MessageBox.Show("Drag mouse across image to view different pages"); 
   // After you are done, you must remove the event handler as in below 
   // 
   // viewer.InteractivePage -= new EventHandler<RasterViewerLineEventArgs>(viewer_InteractivePage); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images"; 
}

Imports Leadtools.WinForms 
Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing.Color 
Imports Leadtools.Drawing 
 
Private Sub viewer_InteractivePage(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.SizeNS 
   ElseIf e.Status = RasterViewerInteractiveStatus.End Then 
      viewer.Cursor = Cursors.Default 
   End If 
   Console.WriteLine("InteractivePage: 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_InteractivePage(ByVal viewer As RasterImageViewer) 
   ' Load a multipage file 
   Dim codecs As RasterCodecs = New RasterCodecs() 
   viewer.Image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "eye.gif")) 
   codecs.Dispose() 
 
   viewer.InteractiveMode = RasterViewerInteractiveMode.Page 
   AddHandler viewer.InteractivePage, AddressOf viewer_InteractivePage 
 
   MessageBox.Show("Drag mouse across image to view different pages") 
   ' After you are done, you must remove the event handler as in below 
   ' 
   ' viewer.InteractivePage -= new EventHandler<RasterViewerLineEventArgs>(viewer_InteractivePage); 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images" 
End Class

Requirements

Target Platforms

Reference

RasterImageViewer Class

RasterImageViewer Members

Help Version 19.0.2017.10.27

Leadtools.WinForms Assembly

Introduction

Getting Started

Namespaces

Leadtools.WinForms Namespace

Assemblies