OnSourceChanged Method (ImageViewer)

C#
Visual Basic
Objective-C
Java
C++

protected virtual void OnSourceChanged( 
   RoutedPropertyChangedEventArgs<ImageSource> e
)

'Declaration
 
Protected Overridable Sub OnSourceChanged( _
   ByVal e As RoutedPropertyChangedEventArgs(Of ImageSource) _
)

'Usage
 
Dim instance As ImageViewer
Dim e As RoutedPropertyChangedEventArgs(Of ImageSource)
 
instance.OnSourceChanged(e)

protected:
virtual void OnSourceChanged( 
   RoutedPropertyChangedEventArgs<ImageSource^>^ e
)

Parameters

e: A RoutedPropertyChangedEventArgs that contains the event data.

Raising an event invokes the event handler through a delegate.

The OnSourceChanged method also allows derived classes to handle the event without attaching a delegate. This is the preferred technique for handling the event in a derived class.

Notes to Inheritors: When overriding OnSourceChanged in a derived class, be sure to call the base class's OnSourceChanged method so that registered delegates receive the event.

C#
Visual Basic
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Copy Code

Imports Leadtools.Windows.Controls

Private Sub viewer_SourceChanged(ByVal sender As Object, ByVal e As RoutedEventArgs)
    Dim viewer As ImageViewer = TryCast(sender, ImageViewer)
    Dim s As String = String.Format("SourceChanged Event: {0}", viewer.Source.ToString())
    MessageBox.Show(s)
End Sub
Public Sub BitmapSourceViewer_SourceChanged(ByVal viewer As ImageViewer)
    AddHandler viewer.SourceChanged, AddressOf viewer_SourceChanged
    viewer.Source = New BitmapImage(New Uri(Path.Combine(LEAD_VARS.ImagesDir, "cannon.jpg")))

    RemoveHandler viewer.SourceChanged, AddressOf viewer_SourceChanged
End Sub

Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class

using Leadtools.Help;
using Leadtools.Windows.Controls;

private void viewer_SourceChanged(object sender, RoutedEventArgs e)
{
   ImageViewer viewer = sender as ImageViewer;
   string s = string.Format("SourceChanged Event: {0}", viewer.Source.ToString());
   MessageBox.Show(s);
}
public void BitmapSourceViewer_SourceChanged(ImageViewer viewer)
{
   viewer.SourceChanged += new RoutedPropertyChangedEventHandler<ImageSource>(viewer_SourceChanged);
   viewer.Source = new BitmapImage(new Uri(Path.Combine(LEAD_VARS.ImagesDir, "cannon.jpg")));

   viewer.SourceChanged -= new RoutedPropertyChangedEventHandler<ImageSource>(viewer_SourceChanged);
}

static class LEAD_VARS
{
public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}

using Leadtools.Help;
using Leadtools.Windows.Controls;

private void viewer_SourceChanged(object sender, RoutedEventArgs e)
{
   ImageViewer viewer = sender as ImageViewer;
   string s = string.Format("SourceChanged Event: {0}", viewer.Source.ToString());
   MessageBox.Show(s);
}
public void BitmapSourceViewer_SourceChanged(ImageViewer viewer)
{
   viewer.SourceChanged += new RoutedPropertyChangedEventHandler<ImageSource>(viewer_SourceChanged);
   viewer.Source = new BitmapImage(new Uri(LeadtoolsExamples.Common.ImagesPath.Path + "cannon.jpg"));

   viewer.SourceChanged -= new RoutedPropertyChangedEventHandler<ImageSource>(viewer_SourceChanged);
}

Imports Leadtools
Imports Leadtools.Windows.Controls

Private Sub viewer_SourceChanged(ByVal sender As Object, ByVal e As RoutedEventArgs)
   Dim viewer As ImageViewer = TryCast(sender, ImageViewer)
   Dim s As String = String.Format("SourceChanged Event: {0}", viewer.Source.ToString())
   MessageBox.Show(s)
End Sub
Public Sub BitmapSourceViewer_SourceChanged(ByVal viewer As ImageViewer)
   AddHandler viewer.SourceChanged, AddressOf viewer_SourceChanged
   viewer.Source = New BitmapImage(New Uri(LeadtoolsExamples.Common.ImagesPath.Path & "cannon.jpg"))

   RemoveHandler viewer.SourceChanged, AddressOf viewer_SourceChanged
End Sub

Target Platforms

Reference

ImageViewer Class
ImageViewer Members