''' <summary>
''' A form that allows to load PDF document into image viewer and
''' highlight focused XObject in PDF document.
''' </summary>
Public Partial Class PdfContentXObjectToolExamples
    Inherits System.Windows.Forms.Form

    '...
    Private _imageViewer As Vintasoft.Imaging.UI.ImageViewer
    Private _contentXObjectTool As Vintasoft.Imaging.Pdf.UI.PdfContentXObjectTool



    Public Sub New()
        '...

        ' create an instance of the PdfContentXObjectTool
        _contentXObjectTool = New Vintasoft.Imaging.Pdf.UI.PdfContentXObjectTool()

        ' set a pen and brush for image selection
        _contentXObjectTool.SelectionImagesBrush = New System.Drawing.SolidBrush(System.Drawing.Color.FromArgb(32, System.Drawing.Color.Blue))
        _contentXObjectTool.SelectionImagesPen = System.Drawing.Pens.Red
        ' set a pen and brush for form selection
        _contentXObjectTool.SelectionFormsBrush = New System.Drawing.SolidBrush(System.Drawing.Color.FromArgb(32, System.Drawing.Color.Lime))
        _contentXObjectTool.SelectionFormsPen = System.Drawing.Pens.Blue

        ' subscribe to content XObject tool events
        AddHandler _contentXObjectTool.ContentXObjectMouseEnter, New System.EventHandler(Of Vintasoft.Imaging.Pdf.UI.PdfContentXObjectEventArgs)(AddressOf ContentXObjectTool_ContentXObjectMouseEnter)
        AddHandler _contentXObjectTool.ContentXObjectMouseLeave, New System.EventHandler(Of Vintasoft.Imaging.Pdf.UI.PdfContentXObjectEventArgs)(AddressOf ContentXObjectTool_ContentXObjectMouseLeave)

        ' set the content XObject tool as current tool
        _imageViewer.VisualTool = _contentXObjectTool
    End Sub



    ''' <summary>
    ''' Occurs when the mouse pointer enters the XObject on PDF page.
    ''' </summary>
    Private Sub ContentXObjectTool_ContentXObjectMouseEnter(sender As Object, e As Vintasoft.Imaging.Pdf.UI.PdfContentXObjectEventArgs)
        ' add the focused XObject to a list of selected XObjects
        _contentXObjectTool.SelectedXObjects.Add(e.ContentXObject)
    End Sub

    ''' <summary>
    ''' Occurs when the mouse pointer leaves the XObject on PDF page.
    ''' </summary>
    Private Sub ContentXObjectTool_ContentXObjectMouseLeave(sender As Object, e As Vintasoft.Imaging.Pdf.UI.PdfContentXObjectEventArgs)
        ' remove the focused XObject from a list of selected XObjects
        _contentXObjectTool.SelectedXObjects.Remove(e.ContentXObject)
    End Sub

End Class

/// <summary>
/// A form that allows to load PDF document into image viewer and
/// highlight focused XObject in PDF document.
/// </summary>
public partial class PdfContentXObjectToolExamples : System.Windows.Forms.Form
{

    //...
    Vintasoft.Imaging.UI.ImageViewer _imageViewer;
    Vintasoft.Imaging.Pdf.UI.PdfContentXObjectTool _contentXObjectTool;
    

    
    public PdfContentXObjectToolExamples()
    {
        //...
        
        // create an instance of the PdfContentXObjectTool
        _contentXObjectTool = new Vintasoft.Imaging.Pdf.UI.PdfContentXObjectTool();

        // set a pen and brush for image selection
        _contentXObjectTool.SelectionImagesBrush = 
            new System.Drawing.SolidBrush(
                System.Drawing.Color.FromArgb(32, System.Drawing.Color.Blue));
        _contentXObjectTool.SelectionImagesPen = System.Drawing.Pens.Red;
        // set a pen and brush for form selection
        _contentXObjectTool.SelectionFormsBrush = 
            new System.Drawing.SolidBrush(
                System.Drawing.Color.FromArgb(32, System.Drawing.Color.Lime));
        _contentXObjectTool.SelectionFormsPen = System.Drawing.Pens.Blue;

        // subscribe to content XObject tool events
        _contentXObjectTool.ContentXObjectMouseEnter +=
            new System.EventHandler<Vintasoft.Imaging.Pdf.UI.PdfContentXObjectEventArgs>(ContentXObjectTool_ContentXObjectMouseEnter);
        _contentXObjectTool.ContentXObjectMouseLeave +=
            new System.EventHandler<Vintasoft.Imaging.Pdf.UI.PdfContentXObjectEventArgs>(ContentXObjectTool_ContentXObjectMouseLeave);

        // set the content XObject tool as current tool
        _imageViewer.VisualTool = _contentXObjectTool;
    }



    /// <summary>
    /// Occurs when the mouse pointer enters the XObject on PDF page.
    /// </summary>
    private void ContentXObjectTool_ContentXObjectMouseEnter(
        object sender,
        Vintasoft.Imaging.Pdf.UI.PdfContentXObjectEventArgs e)
    {
        // add the focused XObject to a list of selected XObjects
        _contentXObjectTool.SelectedXObjects.Add(e.ContentXObject);
    }

    /// <summary>
    /// Occurs when the mouse pointer leaves the XObject on PDF page.
    /// </summary>
    private void ContentXObjectTool_ContentXObjectMouseLeave(
        object sender,
        Vintasoft.Imaging.Pdf.UI.PdfContentXObjectEventArgs e)
    {
        // remove the focused XObject from a list of selected XObjects
        _contentXObjectTool.SelectedXObjects.Remove(e.ContentXObject);
    }

}