Click event on WpfImageViewer

[waxwings]

Hi Alex,

i would like to catch the click event on a WpfImageViewer with PDF Coordinates (to tell where the user has clicked on a pdf page). Is it possible? I would also like to show some rectangles on the pdf pages programmatically. How can i do that?

Best Regards
Yimei

[Alex]

Hi Yimei,

i would like to catch the click event on a WpfImageViewer with PDF Coordinates (to tell where the user has clicked on a pdf page). Is it possible?

Yes, this is possible. For doing the task you need:

• Subscribe to the WpfImageViewer.MouseDown event
• In handler of WpfImageViewer.MouseDown event
  • Convert a point in mouse (screen) coordinates into a point in the viewer coordinates using the WpfImageViewer.PointFromScreen method
  • Convert a point in viewer coordinates into a point in the image coordinates using the WpfImageViewer.PointToImage method:
    http://www.vintasoft.com/docs/vsimaging ... Image.html
  • Convert a point in image coordinates into a point in the PDF page coordinates using the PdfPage.PointToUnit method:
    http://www.vintasoft.com/docs/vsimaging ... oUnit.html

I would also like to show some rectangles on the pdf pages programmatically. How can i do that?

This is also possible. Please read how to do this here: http://www.vintasoft.com/docs/vsimaging ... fPage.html


Best regards, Alexander

[waxwings]

Hi Alex,

thanks for the reply. I tried the MouseDown event. It works however only on the right mouse click. I would like to work with the left mouse click event. Is it possible?

Best Regards
Yimei

[waxwings]

hi Alex,

could you please also tell me what ist the measurement of the Point if i get it from the PointToImage method?

Best Regards
Yimei Liao

[Alex]

Hi Yimei,

I tried the MouseDown event. It works however only on the right mouse click. I would like to work with the left mouse click event. Is it possible?

There is no difference when you work with left or right mouse button. Could you share a snippet of your code?

could you please also tell me what ist the measurement of the Point if i get it from the PointToImage method?

The PointToImage method (http://www.vintasoft.com/docs/vsimaging ... Image.html) returns point coordinate in pixels.

Best regards, Alexander

[waxwings]

Hi Alex,

here is my code

Code: Select all

imageViewer.MouseDown += new MouseButtonEventHandler(Pdf_MouseDown);

private void Pdf_MouseDown(object sender, MouseEventArgs e)
{
...
}

Pdf_MouseDown is only triggered by the right mouse click.

Best Regards
Yimei Liao

[Alex]

Here is my code:

Code: Select all

...
this.imageViewer1.MouseClick += new System.Windows.Forms.MouseEventHandler(this.imageViewer1_MouseClick);
this.imageViewer1.MouseDown += new System.Windows.Forms.MouseEventHandler(this.imageViewer1_MouseDown);
...

private void imageViewer1_MouseDown(object sender, MouseEventArgs e)
{
    MessageBox.Show("MouseDown " + e.Button.ToString());
}

private void imageViewer1_MouseClick(object sender, MouseEventArgs e)
{
    MessageBox.Show("MouseClick " + e.Button.ToString());
}

and it works correctly for left and right mouse buttons.

Please send working demo project which demonstrates the problem to support@vintasoft.com, we need reproduce your problem.

Best regards, Alexander

[waxwings]

Hi Alex,

the MouseClick Event is not available. I would send you the example codes sortly.

Best regards
Yimei

[waxwings]

Hi Alex,

i have yet another problem. I have some pdf documents, each containing only one page. I open the pdfs one after another, while showing a Rectangular on each of them. Problem is that sometimes the Rectangular shows and sometimes not. It looks like a race condition to me. My codes are like

Code: Select all

private void NextPdf_Click(){
openDocument(nextIndex);
showRectangular();
}

        private void showRectangulars()
        {
            using (PdfGraphics graphics = PdfGraphics.FromPage(FocusedPage))
            {
                System.Drawing.PointF p = new System.Drawing.PointF((float)x, (float)y);
                FocusedPage.PointToUnit(ref p);

                System.Drawing.Color brushColor = System.Drawing.Color.FromArgb(0, 0, 0);
                PdfBrush brush = new PdfBrush(brushColor, GraphicsStateBlendMode.Multiply);
                PdfPen pen = new PdfPen(brushColor);

                graphics.FillAndDrawRectangle(pen, brush, 100, 100, 200, 200);
            }
            imageViewer.Image.Reload(true);
        }

        private void OpenDocument(int index)
        {
                CloseDocument();
                PdfDocumentController.AuthenticateRequest += new EventHandler<PdfDocumentOpenedEventArgs>(PdfDocumentController_AuthenticateRequest);

                String filename = VM.getPdfName(index);
                try
                {
                    // try open in read-write mode
                    _documentStream = new FileStream(filename, FileMode.Open, FileAccess.ReadWrite);
                }
                catch (IOException)
                {
                    try
                    {
                        // try open in read mode
                        _documentStream = new FileStream(filename, FileMode.Open, FileAccess.Read);
                    }
                    catch (IOException e)
                    {
                        Debug.Write(e);
                        return;
                    }
                }
                catch (Exception e)
                {
                    Debug.Write(e);
                    return;
                }
                try
                {
                    _document = PdfDocumentController.OpenDocument(_documentStream);

                    if (_document.IsEncrypted && _document.AuthorizationResult == AuthorizationResult.IncorrectPassword)
                    {
                        CloseDocument();
                        return;
                    }
                }
                catch (Exception e)
                {
                    Debug.Write(e);
                    CloseDocument();
                    return;
                }
                _document.RenderingSettings.UseEmbeddedThumbnails = true;

                try
                {
                    imageViewer.Images.Add(_documentStream);
                }
                catch (Exception e)
                {
                    Debug.Write(e);
                    CloseDocument();
                    return;
                }
        }

        /// <summary>
        /// get the password from the AppConfiguration
        /// </summary>
        void PdfDocumentController_AuthenticateRequest(object sender, PdfDocumentOpenedEventArgs e)
        {
            PdfDocument document = e.Document;
            while (true)
            {
                AuthorizationResult authorization = document.Authenticate(AppConfiguration.PDF_DECRYPTION_KEY);
                if (authorization == AuthorizationResult.IncorrectPassword)
                {
                    Console.WriteLine("The password is incorrect.");
                }
                else
                {
                    Console.WriteLine(authorization.ToString());
                    return;
                }
            }
        }

Best regards
Yimei

[Alex]

Hi Yimei,

i have yet another problem. I have some pdf documents, each containing only one page. I open the pdfs one after another, while showing a Rectangular on each of them. Problem is that sometimes the Rectangular shows and sometimes not. It looks like a race condition to me. My codes are like

I think your code has logical mistake. Please send working demo project which demonstrates the problem to support@vintasoft.com, we need reproduce your problem.

Best regards, Alexander