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ImageUrlChanged Event
See Also  Example
Leadtools.Web.Controls Namespace > ImageViewer Class : ImageUrlChanged Event




Occurs when the value of the ImageUrl property changes.

Syntax

Visual Basic (Declaration) 
Public Event ImageUrlChanged() As EventHandler
Visual Basic (Usage)Copy Code
Dim instance As ImageViewer
Dim handler As EventHandler
 
AddHandler instance.ImageUrlChanged, handler
C# 
public event EventHandler ImageUrlChanged()
Managed Extensions for C++ 
public: __event EventHandler* ImageUrlChanged();
C++/CLI 
public:
event EventHandler^ ImageUrlChanged();

Example

Visual BasicCopy Code
Public Class MyImageViewer
   Inherits ImageViewer
   '.
   '.
   '.
   Protected Overrides Sub OnImageUrlChanged(ByVal e As EventArgs)
      MyBase.OnImageUrlChanged(e)

      Console.WriteLine("OnImageUrlChanged is called")
   End Sub

   Protected Overrides Sub OnImageSizeChanged(ByVal e As EventArgs)

      MyBase.OnImageSizeChanged(e)

      Console.WriteLine("OnImageSizeChanged is called")
   End Sub

   Protected Overrides Sub OnScaleFactorChanged(ByVal e As EventArgs)
      MyBase.OnScaleFactorChanged(e)

      Console.WriteLine("OnScaleFactorChanged is called")
   End Sub

   Protected Overrides Sub OnSizeModeChanged(ByVal e As EventArgs)
      MyBase.OnSizeModeChanged(e)

      Console.WriteLine("OnSizeModeChanged is called")
   End Sub

   Protected Overrides Sub OnHorizontalAlignModeChanged(ByVal e As EventArgs)
      MyBase.OnHorizontalAlignModeChanged(e)

      Console.WriteLine("OnHorizontalAlignModeChanged is called")
   End Sub

   Protected Overrides Sub OnVerticalAlignModeChanged(ByVal e As EventArgs)
      MyBase.OnVerticalAlignModeChanged(e)

      Console.WriteLine("OnVerticalAlignModeChanged is called")
   End Sub

   Protected Overrides Sub OnScrollBarSizeChanged(ByVal e As EventArgs)
      MyBase.OnScrollBarSizeChanged(e)

      Console.WriteLine("OnScrollBarSizeChanged is called")
   End Sub

   Protected Overrides Sub OnResourcesPathChanged(ByVal e As EventArgs)
      MyBase.OnResourcesPathChanged(e)

      Console.WriteLine("OnResourcesPathChanged is called")
   End Sub
End Class

Public Sub TestMyImageViewer()
   Dim myViewer As MyImageViewer = New MyImageViewer()

   AddHandler myViewer.ImageUrlChanged, AddressOf myViewer_ImageUrlChanged
   AddHandler myViewer.ImageSizeChanged, AddressOf myViewer_ImageSizeChanged
   AddHandler myViewer.ScaleFactorChanged, AddressOf myViewer_ScaleFactorChanged
   AddHandler myViewer.SizeModeChanged, AddressOf myViewer_SizeModeChanged
   AddHandler myViewer.HorizontalAlignModeChanged, AddressOf myViewer_HorizontalAlignModeChanged
   AddHandler myViewer.VerticalAlignModeChanged, AddressOf myViewer_VerticalAlignModeChanged
   AddHandler myViewer.ScrollBarSizeChanged, AddressOf myViewer_ScrollBarSizeChanged
   AddHandler myViewer.ResourcesPathChanged, AddressOf myViewer_ResourcesPathChanged

   myViewer.ImageUrl = "http://leadtools.com/images/15-homepg-banner.jpg"
   myViewer.ImageSize = New Size(765, 235)
   myViewer.ScaleFactor = 150
   myViewer.SizeMode = ImageViewerSizeMode.Normal
   myViewer.HorizontalAlignMode = ImageViewerAlignMode.Center
   myViewer.VerticalAlignMode = ImageViewerAlignMode.Center
   myViewer.ScrollBarSize = 16
   myViewer.ResourcesPath = "/Resources/"
End Sub

Sub myViewer_ImageUrlChanged(ByVal sender As Object, ByVal e As EventArgs)
   Dim viewer As MyImageViewer = CType(sender, MyImageViewer)
   If Not viewer Is Nothing Then
      Console.WriteLine("ImageUrl Changed to " & viewer.ImageUrl)
   End If
End Sub

Sub myViewer_ImageSizeChanged(ByVal sender As Object, ByVal e As EventArgs)
   Dim viewer As MyImageViewer = CType(sender, MyImageViewer)
   If Not viewer Is Nothing Then
      Console.WriteLine("ImageSize Changed to " & viewer.ImageSize.ToString())
   End If
End Sub

Sub myViewer_ScaleFactorChanged(ByVal sender As Object, ByVal e As EventArgs)
   Dim viewer As MyImageViewer = CType(sender, MyImageViewer)
   If Not viewer Is Nothing Then
      Console.WriteLine("ScaleFactor Changed to " & viewer.ScaleFactor.ToString())
   End If
End Sub

Sub myViewer_SizeModeChanged(ByVal sender As Object, ByVal e As EventArgs)
   Dim viewer As MyImageViewer = CType(sender, MyImageViewer)
   If Not viewer Is Nothing Then
      Console.WriteLine("SizeMode Changed to " & viewer.SizeMode.ToString())
   End If
End Sub

Sub myViewer_HorizontalAlignModeChanged(ByVal sender As Object, ByVal e As EventArgs)
   Dim viewer As MyImageViewer = CType(sender, MyImageViewer)
   If Not viewer Is Nothing Then
      Console.WriteLine("HorizontalAlignMode Changed to " & viewer.HorizontalAlignMode.ToString())
   End If
End Sub

Sub myViewer_VerticalAlignModeChanged(ByVal sender As Object, ByVal e As EventArgs)
   Dim viewer As MyImageViewer = CType(sender, MyImageViewer)
   If Not viewer Is Nothing Then
      Console.WriteLine("VerticalAlignMode Changed to " & viewer.VerticalAlignMode.ToString())
   End If
End Sub

Sub myViewer_ScrollBarSizeChanged(ByVal sender As Object, ByVal e As EventArgs)
   Dim viewer As MyImageViewer = CType(sender, MyImageViewer)
   If Not viewer Is Nothing Then
      Console.WriteLine("ScrollBarSize Changed to " & viewer.ScrollBarSize.ToString())
   End If
End Sub

Sub myViewer_ResourcesPathChanged(ByVal sender As Object, ByVal e As EventArgs)
   Dim viewer As MyImageViewer = CType(sender, MyImageViewer)
   If Not viewer Is Nothing Then
      Console.WriteLine("ResourcesPath Changed to " & viewer.ResourcesPath)
   End If
End Sub
C#Copy Code
public class MyImageViewer : ImageViewer 
{ 
   //. 
   //. 
   //. 
   protected override void OnImageUrlChanged(EventArgs e) 
   { 
      base.OnImageUrlChanged(e); 
 
      Console.WriteLine("OnImageUrlChanged is called"); 
   } 
 
   protected override void OnImageSizeChanged(EventArgs e) 
   { 
      base.OnImageSizeChanged(e); 
 
      Console.WriteLine("OnImageSizeChanged is called"); 
   } 
 
   protected override void OnScaleFactorChanged(EventArgs e) 
   { 
      base.OnScaleFactorChanged(e); 
 
      Console.WriteLine("OnScaleFactorChanged is called"); 
   } 
 
   protected override void OnSizeModeChanged(EventArgs e) 
   { 
      base.OnSizeModeChanged(e); 
 
      Console.WriteLine("OnSizeModeChanged is called"); 
   } 
 
   protected override void OnHorizontalAlignModeChanged(EventArgs e) 
   { 
      base.OnHorizontalAlignModeChanged(e); 
 
      Console.WriteLine("OnHorizontalAlignModeChanged is called"); 
   } 
 
   protected override void OnVerticalAlignModeChanged(EventArgs e) 
   { 
      base.OnVerticalAlignModeChanged(e); 
 
      Console.WriteLine("OnVerticalAlignModeChanged is called"); 
   } 
 
   protected override void OnScrollBarSizeChanged(EventArgs e) 
   { 
      base.OnScrollBarSizeChanged(e); 
 
      Console.WriteLine("OnScrollBarSizeChanged is called"); 
   } 
 
   protected override void OnResourcesPathChanged(EventArgs e) 
   { 
      base.OnResourcesPathChanged(e); 
 
      Console.WriteLine("OnResourcesPathChanged is called"); 
   } 
} 
 
void myViewer_ImageUrlChanged(object sender, EventArgs e) 
{ 
   MyImageViewer viewer = (MyImageViewer)sender; 
   if(viewer != null) 
      Console.WriteLine("ImageUrl Changed to " + viewer.ImageUrl); 
} 
 
void myViewer_ImageSizeChanged(object sender, EventArgs e) 
{ 
   MyImageViewer viewer = (MyImageViewer)sender; 
   if(viewer != null) 
      Console.WriteLine("ImageSize Changed to " + viewer.ImageSize.ToString()); 
} 
 
void myViewer_ScaleFactorChanged(object sender, EventArgs e) 
{ 
   MyImageViewer viewer = (MyImageViewer)sender; 
   if(viewer != null) 
      Console.WriteLine("ScaleFactor Changed to " + viewer.ScaleFactor.ToString()); 
} 
 
void myViewer_SizeModeChanged(object sender, EventArgs e) 
{ 
   MyImageViewer viewer = (MyImageViewer)sender; 
   if(viewer != null) 
      Console.WriteLine("SizeMode Changed to " + viewer.SizeMode.ToString()); 
} 
 
void myViewer_HorizontalAlignModeChanged(object sender, EventArgs e) 
{ 
   MyImageViewer viewer = (MyImageViewer)sender; 
   if(viewer != null) 
      Console.WriteLine("HorizontalAlignMode Changed to " + viewer.HorizontalAlignMode.ToString()); 
} 
 
void myViewer_VerticalAlignModeChanged(object sender, EventArgs e) 
{ 
   MyImageViewer viewer = (MyImageViewer)sender; 
   if(viewer != null) 
      Console.WriteLine("VerticalAlignMode Changed to " + viewer.VerticalAlignMode.ToString()); 
} 
 
void myViewer_ScrollBarSizeChanged(object sender, EventArgs e) 
{ 
   MyImageViewer viewer = (MyImageViewer)sender; 
   if(viewer != null) 
      Console.WriteLine("ScrollBarSize Changed to " + viewer.ScrollBarSize.ToString()); 
} 
 
void myViewer_ResourcesPathChanged(object sender, EventArgs e) 
{ 
   MyImageViewer viewer = (MyImageViewer)sender; 
   if(viewer != null) 
      Console.WriteLine("ResourcesPath Changed to " + viewer.ResourcesPath.ToString()); 
}

Remarks

This event is raised if the ImageUrl property is changed programmatically.

Requirements

Target Platforms: Microsoft .NET Framework 2.0, Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

See Also