PagesChanged Event

Summary

Occurs when pages are added, inserted or removed from this RasterImage object.

Syntax

Objective-C

C++/CLI

Java

Python

public event EventHandler<RasterImagePagesChangedEventArgs> PagesChanged

extern NSString *const LTRasterImagePagesChangedNotification 
extern NSString* const LTRasterImagePagesChangedNotificationAction 
extern NSString* const LTRasterImagePagesChangedNotificationStartIndex 
extern NSString* const LTRasterImagePagesChangedNotificationCount

synchronized public void addPageChangedListener(RasterImagePagesChangedListener listener) 
synchronized public void removePageChangedListener(RasterImagePagesChangedListener listener)

public: 
event EventHandler<RasterImagePagesChangedEventArgs^>^ PagesChanged

def PagesChanged(sender,e): # sender: RasterImage e: RasterImagePagesChangedEventArgs

Event Data

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

Property	Description
Action	(Read only) Indicates whether pages are added, removed or inserted.

Remarks

For more information, refer to RasterImagePagesChangedEventArgs.

Example

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Core; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Dicom; 
using Leadtools.Drawing; 
using Leadtools.Controls; 
using Leadtools.Svg; 
 
 
public void PagesChangedExample() 
{ 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.Options.Load.AllPages = true; 
 
   string srcFileName1 = Path.Combine(LEAD_VARS.ImagesDir, "eye.gif"); 
   string srcFileName2 = Path.Combine(LEAD_VARS.ImagesDir, "image1.cmp"); 
 
   // Load the multi-page image 
   RasterImage srcImage = codecs.Load(srcFileName1); 
   srcImage.PagesChanged += new EventHandler<RasterImagePagesChangedEventArgs>(Image_PagesChanged); 
 
   // Show the number of pages in this file 
   Console.WriteLine("Pages in the image: {0}", srcImage.PageCount); 
 
   // Show and change the active page 
   Console.WriteLine("Active page: {0}", srcImage.Page); 
   srcImage.Page = 3; 
   Console.WriteLine("Active page: {0}", srcImage.Page); 
   srcImage.Page = 1; 
 
   // Load a single page image and add it to the end 
   RasterImage pageImage = codecs.Load(srcFileName2); 
   pageImage.PagesChanged += new EventHandler<RasterImagePagesChangedEventArgs>(Image_PagesChanged); 
   Console.WriteLine("Adding a single page"); 
   srcImage.AddPage(pageImage); 
   Console.WriteLine("Pages in the image: {0}", srcImage.PageCount); 
 
   // Load a multi page image and add a few pages to this image 
   pageImage = codecs.Load(srcFileName1); 
   pageImage.PagesChanged += new EventHandler<RasterImagePagesChangedEventArgs>(Image_PagesChanged); 
   Console.WriteLine("Adding multi-pages"); 
   srcImage.AddPages(pageImage, 1, 2); 
   Console.WriteLine("Pages in the image: {0}", srcImage.PageCount); 
 
   // Insert a page in the middle 
   Console.WriteLine("Inserting a page"); 
   srcImage.InsertPage(4, pageImage); 
   Console.WriteLine("Pages in the image: {0}", srcImage.PageCount); 
 
   // Insert the rest of the pages at the beginning 
   Console.WriteLine("Inserting pages"); 
   srcImage.InsertPages(0, pageImage, 1, -1); 
   Console.WriteLine("Pages in the image: {0}", srcImage.PageCount); 
 
   // Remove the first page 
   Console.WriteLine("Removing a page"); 
   srcImage.RemovePageAt(1); 
   Console.WriteLine("Pages in the image: {0}", srcImage.PageCount); 
 
   // Remove the last 3 pages 
   Console.WriteLine("Removing pages"); 
   srcImage.RemovePages(srcImage.PageCount - 3, -1); 
   Console.WriteLine("Pages in the image: {0}", srcImage.PageCount); 
 
   // Remove all the pages (leaves 1) 
   Console.WriteLine("Removing all pages"); 
   srcImage.RemoveAllPages(); 
   Console.WriteLine("Pages in the image: {0}", srcImage.PageCount); 
 
   srcImage.Dispose(); 
   codecs.Dispose(); 
} 
 
void Image_PagesChanged(object sender, RasterImagePagesChangedEventArgs e) 
{ 
   Console.WriteLine("Added = {0}, Index = {1}, Count = {2}", e.Action, e.StartIndex, e.Count); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
}

Requirements

Target Platforms

Reference

RasterImage Class

RasterImage Members

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Help Version 23.0.2024.2.29

Leadtools Assembly

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Leadtools Namespace

Leadtools.ImageProcessing Namespace

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