Leadtools Namespace > RasterImage Class : Changed Event |
public event EventHandler<RasterImageChangedEventArgs> Changed
'Declaration Public Event Changed As EventHandler(Of RasterImageChangedEventArgs)
'Usage Dim instance As RasterImage Dim handler As EventHandler(Of RasterImageChangedEventArgs) AddHandler instance.Changed, handler
public event EventHandler<RasterImageChangedEventArgs> Changed
add_Changed(function(sender, e)) remove_Changed(function(sender, e))
public: event EventHandler<RasterImageChangedEventArgs^>^ Changed
The event handler receives an argument of type RasterImageChangedEventArgs containing data related to this event. The following RasterImageChangedEventArgs properties provide information specific to this event.
Property | Description |
---|---|
Flags | Gets the flags for the Changed event. |
When the data or attributes of a RasterImage object changes, the Changed event is fired with information of what has changed. For example, you can subscribe to this event to get notified when the RasterImage object has been changed and need to be updated in your user interface by re-painting it.
For more information, refer to RasterImageChangedEventArgs.
Public Sub ChangedExample() Dim codecs As RasterCodecs = New RasterCodecs() Dim srcFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp") ' Load the image Dim img As RasterImage = codecs.Load(srcFileName) ' Subscribe to the Changed event of this image AddHandler img.Changed, AddressOf img_Changed ' Call a few methods and image processing commands that changes the image Console.WriteLine("Calling FlipViewPerspective") img.FlipViewPerspective(True) Console.WriteLine("Calling RotateViewPerspective") img.RotateViewPerspective(90) Console.WriteLine("Calling FlipCommand") Dim flip As FlipCommand = New FlipCommand(True) flip.Run(img) ' Now disable firing the events and call the methods again Console.WriteLine("Disabling the events") img.DisableEvents() Console.WriteLine("Calling FlipViewPerspective") img.FlipViewPerspective(True) Console.WriteLine("Calling RotateViewPerspective") img.RotateViewPerspective(90) Console.WriteLine("Calling FlipCommand while") flip.Run(img) ' Re-enable the events and fire it manually Console.WriteLine("Re-enabling the events") img.EnableEvents() Console.WriteLine("Firing the event manually") Dim flags As RasterImageChangedFlags = RasterImageChangedFlags.Data Or RasterImageChangedFlags.ViewPerspective Dim e As RasterImageChangedEventArgs = New RasterImageChangedEventArgs(flags) img.OnChanged(e) ' Clean up RemoveHandler img.Changed, AddressOf img_Changed img.Dispose() codecs.Dispose() End Sub Private Sub img_Changed(ByVal sender As Object, ByVal e As RasterImageChangedEventArgs) ' Show the changed flags Console.WriteLine("Changed: {0}", e.Flags) End Sub Public NotInheritable Class LEAD_VARS Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images" End Class
public void ChangedExample() { RasterCodecs codecs = new RasterCodecs(); string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp"); // Load the image RasterImage img = codecs.Load(srcFileName); // Subscribe to the Changed event of this image img.Changed += new EventHandler<RasterImageChangedEventArgs>(img_Changed); // Call a few methods and image processing commands that changes the image Console.WriteLine("Calling FlipViewPerspective"); img.FlipViewPerspective(true); Console.WriteLine("Calling RotateViewPerspective"); img.RotateViewPerspective(90); Console.WriteLine("Calling FlipCommand"); FlipCommand flip = new FlipCommand(true); flip.Run(img); // Now disable firing the events and call the methods again Console.WriteLine("Disabling the events"); img.DisableEvents(); Console.WriteLine("Calling FlipViewPerspective"); img.FlipViewPerspective(true); Console.WriteLine("Calling RotateViewPerspective"); img.RotateViewPerspective(90); Console.WriteLine("Calling FlipCommand while"); flip.Run(img); // Re-enable the events and fire it manually Console.WriteLine("Re-enabling the events"); img.EnableEvents(); Console.WriteLine("Firing the event manually"); RasterImageChangedFlags flags = RasterImageChangedFlags.Data | RasterImageChangedFlags.ViewPerspective; RasterImageChangedEventArgs e = new RasterImageChangedEventArgs(flags); img.OnChanged(e); // Clean up img.Changed -= new EventHandler<RasterImageChangedEventArgs>(img_Changed); img.Dispose(); codecs.Dispose(); } void img_Changed(object sender, RasterImageChangedEventArgs e) { // Show the changed flags Console.WriteLine("Changed: {0}", e.Flags); } static class LEAD_VARS { public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images"; }
RasterImageExamples.prototype.ChangedExample = function () { Tools.SetLicense(); with ( Leadtools ) { with (Leadtools.Codecs) { var codecs = new RasterCodecs(); var srcFileName = "Assets\\Image1.cmp"; // Load the image return Tools.AppInstallFolder().getFileAsync(srcFileName).then(function (loadFile) { return codecs.loadAsync(LeadStreamFactory.create(loadFile)); }) .then(function (img) { // Subscribe to the Changed event of this image img.addEventListener("changed", img_Changed); // Call a few methods and image processing commands that changes the image console.info("Calling FlipViewPerspective"); img.flipViewPerspective(true); console.info("Calling RotateViewPerspective"); img.rotateViewPerspective(90); console.info("Calling FlipCommand"); var flip = new Leadtools.ImageProcessing.FlipCommand(true); flip.run(img); // Now disable firing the events and call the methods again console.info("Disabling the events"); img.disableEvents(); console.info("Calling FlipViewPerspective"); img.flipViewPerspective(true); console.info("Calling RotateViewPerspective"); img.rotateViewPerspective(90); console.info("Calling FlipCommand while"); flip.run(img); // Re-enable the events and fire it manually console.info("Re-enabling the events"); img.enableEvents(); console.info("Firing the event manually"); var flags = RasterImageChangedFlags.data | RasterImageChangedFlags.viewPerspective; var e = new RasterImageChangedEventArgs(flags); img.onChanged(e); // Clean up img.removeEventListener ( "changed", img_Changed); img.close(); codecs.close(); }, function (error) { HandleError(error); }); } } } function img_Changed(args) { // Show the changed flags console.info("Changed: ", args.flags); }
[TestMethod] public async Task ChangedExample() { RasterCodecs codecs = new RasterCodecs(); string srcFileName = @"Assets\Image1.cmp"; // Load the image StorageFile loadFile = await Tools.AppInstallFolder.GetFileAsync(srcFileName); RasterImage img = await codecs.LoadAsync(LeadStreamFactory.Create(loadFile)); // Subscribe to the Changed event of this image img.Changed += new EventHandler<RasterImageChangedEventArgs>(img_Changed); // Call a few methods and image processing commands that changes the image Debug.WriteLine("Calling FlipViewPerspective"); img.FlipViewPerspective(true); Debug.WriteLine("Calling RotateViewPerspective"); img.RotateViewPerspective(90); Debug.WriteLine("Calling FlipCommand"); FlipCommand flip = new FlipCommand(true); flip.Run(img); // Now disable firing the events and call the methods again Debug.WriteLine("Disabling the events"); img.DisableEvents(); Debug.WriteLine("Calling FlipViewPerspective"); img.FlipViewPerspective(true); Debug.WriteLine("Calling RotateViewPerspective"); img.RotateViewPerspective(90); Debug.WriteLine("Calling FlipCommand while"); flip.Run(img); // Re-enable the events and fire it manually Debug.WriteLine("Re-enabling the events"); img.EnableEvents(); Debug.WriteLine("Firing the event manually"); RasterImageChangedFlags flags = RasterImageChangedFlags.Data | RasterImageChangedFlags.ViewPerspective; RasterImageChangedEventArgs e = new RasterImageChangedEventArgs(flags); img.OnChanged(e); // Clean up img.Changed -= new EventHandler<RasterImageChangedEventArgs>(img_Changed); img.Dispose(); codecs.Dispose(); } void img_Changed(object sender, RasterImageChangedEventArgs e) { // Show the changed flags Debug.WriteLine("Changed: {0}", e.Flags); }
public void ChangedExample() { // create a new image to work with RasterImage img = new RasterImage(RasterMemoryFlags.Conventional, 500, 500, 24, RasterByteOrder.Bgr, RasterViewPerspective.TopLeft, null, null, 0); // Subscribe to the Changed event of this image img.Changed += new EventHandler<RasterImageChangedEventArgs>(img_Changed); // Call a few methods and image processing commands that changes the image Debug.WriteLine("Calling FlipViewPerspective"); img.FlipViewPerspective(true); Debug.WriteLine("Calling RotateViewPerspective"); img.RotateViewPerspective(90); Debug.WriteLine("Calling FlipCommand"); FlipCommand flip = new FlipCommand(true); flip.Run(img); // Now disable firing the events and call the methods again Debug.WriteLine("Disabling the events"); img.DisableEvents(); Debug.WriteLine("Calling FlipViewPerspective"); img.FlipViewPerspective(true); Debug.WriteLine("Calling RotateViewPerspective"); img.RotateViewPerspective(90); Debug.WriteLine("Calling FlipCommand while"); flip.Run(img); // Re-enable the events and fire it manually Debug.WriteLine("Re-enabling the events"); img.EnableEvents(); Debug.WriteLine("Firing the event manually"); RasterImageChangedFlags flags = RasterImageChangedFlags.Data | RasterImageChangedFlags.ViewPerspective; RasterImageChangedEventArgs e = new RasterImageChangedEventArgs(flags); img.OnChanged(e); // Clean up img.Changed -= new EventHandler<RasterImageChangedEventArgs>(img_Changed); img.Dispose(); } void img_Changed(object sender, RasterImageChangedEventArgs e) { // Show the changed flags Debug.WriteLine("Changed: {0}", e.Flags); }
Public Sub ChangedExample()
' create a new image to work with
Dim img As RasterImage = New RasterImage(RasterMemoryFlags.Conventional, 500, 500, 24, RasterByteOrder.Bgr, RasterViewPerspective.TopLeft, Nothing, Nothing, 0)
' Subscribe to the Changed event of this image
AddHandler img.Changed, AddressOf img_Changed
' Call a few methods and image processing commands that changes the image
Debug.WriteLine("Calling FlipViewPerspective")
img.FlipViewPerspective(True)
Debug.WriteLine("Calling RotateViewPerspective")
img.RotateViewPerspective(90)
Debug.WriteLine("Calling FlipCommand")
Dim flip As FlipCommand = New FlipCommand(True)
flip.Run(img)
' Now disable firing the events and call the methods again
Debug.WriteLine("Disabling the events")
img.DisableEvents()
Debug.WriteLine("Calling FlipViewPerspective")
img.FlipViewPerspective(True)
Debug.WriteLine("Calling RotateViewPerspective")
img.RotateViewPerspective(90)
Debug.WriteLine("Calling FlipCommand while")
flip.Run(img)
' Re-enable the events and fire it manually
Debug.WriteLine("Re-enabling the events")
img.EnableEvents()
Debug.WriteLine("Firing the event manually")
Dim flags As RasterImageChangedFlags = RasterImageChangedFlags.Data Or RasterImageChangedFlags.ViewPerspective
Dim e As RasterImageChangedEventArgs = New RasterImageChangedEventArgs(flags)
img.OnChanged(e)
' Clean up
RemoveHandler img.Changed, AddressOf img_Changed
img.Dispose()
End Sub
Private Sub img_Changed(ByVal sender As Object, ByVal e As RasterImageChangedEventArgs)
' Show the changed flags
Debug.WriteLine("Changed: {0}", e.Flags)
End Sub
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2