''' <summary>
''' The images manager for an image viewer.
''' </summary>
Private _imagesManager As Vintasoft.Imaging.UI.ImageViewerImagesManager



''' <summary>
''' Initializes a new instance of the <see cref="MainForm1"/> class.
''' </summary>
Public Sub New()
    InitializeComponent()

    ' create images manager
    _imagesManager = New Vintasoft.Imaging.UI.ImageViewerImagesManager(imageViewer1)
    ' specify that manager should retrieve information about image from file during 1 second, add images to an image viewer,
    ' do previous steps until information about all images will not be retrieved
    _imagesManager.IntermediateAddInterval = 1000
    ' specify that manager should work asynchronously
    _imagesManager.IsAsync = True
    AddHandler _imagesManager.ImageSourceAddException, AddressOf ImagesManager_ImageSourceAddException
End Sub



''' <summary>
''' Opens an image file.
''' </summary>
''' <param name="filename">The filename.</param>
Friend Sub OpenImageFile(filename As String)
    ' cancel previous file opening process
    CancelOpening()
    ' clear image collection of manager
    _imagesManager.Images.ClearAndDisposeItems()
    ' add image file to the manager
    _imagesManager.Add(filename)
End Sub

''' <summary>
''' Cancels the opening of a file.
''' </summary>
Private Sub CancelOpening()
    _imagesManager.Cancel()
End Sub

Private Sub ImagesManager_ImageSourceAddException(sender As Object, e As Vintasoft.Imaging.ImageSourceExceptionEventArgs)
    Dim message As String = String.Format("Cannot open {0} : {1}", System.IO.Path.GetFileName(e.SourceFilename), e.Exception.Message)
    System.Windows.Forms.MessageBox.Show(message, "Error")
End Sub

/// <summary>
/// The images manager for an image viewer.
/// </summary>
Vintasoft.Imaging.UI.ImageViewerImagesManager _imagesManager;



/// <summary>
/// Initializes a new instance of the <see cref="MainForm1"/> class.
/// </summary>
public MainForm1()
{
    InitializeComponent();

    // create images manager
    _imagesManager = new Vintasoft.Imaging.UI.ImageViewerImagesManager(imageViewer1);
    // specify that manager should retrieve information about image from file during 1 second, add images to an image viewer,
    // do previous steps until information about all images will not be retrieved
    _imagesManager.IntermediateAddInterval = 1000;
    // specify that manager should work asynchronously
    _imagesManager.IsAsync = true;
    _imagesManager.ImageSourceAddException += ImagesManager_ImageSourceAddException;
}



/// <summary>
/// Opens an image file.
/// </summary>
/// <param name="filename">The filename.</param>
internal void OpenImageFile(string filename)
{
    // cancel previous file opening process
    CancelOpening();
    // clear image collection of manager
    _imagesManager.Images.ClearAndDisposeItems();
    // add image file to the manager
    _imagesManager.Add(filename);
}

/// <summary>
/// Cancels the opening of a file.
/// </summary>
private void CancelOpening()
{
    _imagesManager.Cancel();
}

private void ImagesManager_ImageSourceAddException(object sender, Vintasoft.Imaging.ImageSourceExceptionEventArgs e)
{
    string message = string.Format("Cannot open {0} : {1}", System.IO.Path.GetFileName(e.SourceFilename), e.Exception.Message);
    System.Windows.Forms.MessageBox.Show(message, "Error");
}