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Scroll pages under each other (Delphi)
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Amelie View Drop Down
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Joined: 10 Nov 17
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Points: 13 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Amelie Quote  Post ReplyReply Direct Link To This Post Topic: Scroll pages under each other (Delphi)
    Posted: 06 Dec 17 at 5:21PM
Hello Smile!

is it possible please to see all pages of a PDF file as the attached image?
Scroll pages under each other.

How to do this please?


Thank you.

Best regards.

Amelie
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Ingo View Drop Down
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Joined: 29 Oct 05
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Points: 3524 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ingo Quote  Post ReplyReply Direct Link To This Post Posted: 06 Dec 17 at 5:37PM
Hi Amelie,

you don't like reading in the online reference or the developer guide i think ;-)
What you wanna get is the viewer scaling you can set inside your pdf-reader.
If you want it immediately you can set the viewer preferences with QuickPDF - so the pdf-reader will open and display your pdf like you want it.
Have a look at an older post of mine:
http://www.quickpdf.org/forum/how-to-set-the-pdfviewerpreferences_topic1415.html
Cheers,
Ingo
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Amelie View Drop Down
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Points: 13 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Amelie Quote  Post ReplyReply Direct Link To This Post Posted: 06 Dec 17 at 6:49PM
Hi Ingo Smile

Thank you !!

No, I already read it. In the example in the "Demo" directory, you assign the display of each page to a "Timing":

procedure TfrmDemo.btnViewPrintLoadPDFClick (Sender: TObject);
var
  Password: string;
  R: Integer;
  CanProceed: Boolean;
  BlankBM: TBitmap;
begin
  if Assigned (ViewPrintQP) then
  begin
    ViewPrintQP.Free;
    ViewPrintQP: = nil;
  end;
  CanProceed: = False;
  if dlgOpen.Execute then
  begin
    ViewPrintQP: = TDebenuPDFLibrary.Create;
    if ViewPrintQP.UnlockKey (edtLicenseKey.Text) = 1 then
    begin
      if ViewPrintQP.LoadFromFile (dlgOpen.FileName, '') = 1 then
      begin
        CanProceed: = True;
      end else
        MessageDlg ('The PDF could not be opened.', MtError, [mbOK], 0);
    end else
      MessageDlg ('The license key is invalid or has expired.', MtError, [mbOK], 0);
  end;
  if CanProceed then
  begin
    ViewPrintPageNum: = 1;
    RenderPage;
  end else
  begin
    BlankBM: = TBitmap.Create;
    try
      imgPreview.Picture.Assign (BlankBM);
    finally
      BlankBM.Free;
    end;
    ViewPrintQP.Free;
    ViewPrintQP: = nil;
  end;

end;

How to have the display I want to get in a Timage? or do you have to display all the pages in another component?

Thanks for your help Smile
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Ingo View Drop Down
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Joined: 29 Oct 05
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Points: 3524 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ingo Quote  Post ReplyReply Direct Link To This Post Posted: 06 Dec 17 at 7:12PM
Hi,

it's not as easy as you think about it ;-)
Here's a sample you can use as a starting point:
http://www.debenu.com/kb/render-page-using-dqpl/

In your sample your preview could only be an empty page (even the white of a blank page will be missed). If one page after the other shall be displayed at first you have to determine how many pages are in the pdf. Then you have to start a loop... selecting page after page with the rendering. Your single "RenderPage" won't do anything... ;-)
Cheers,
Ingo
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Mitchells View Drop Down
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Points: 1 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Mitchells Quote  Post ReplyReply Direct Link To This Post Posted: 02 Jan 18 at 12:17PM
Originally posted by Ingo Ingo wrote:

Hi,

it's not as easy as you think about it ;-)
Here's a sample of Performer 8 results so you can use as a starting point:
http://www.debenu.com/kb/render-page-using-dqpl/

In your sample your preview could only be an empty page (even the white of a blank page will be missed). If one page after the other shall be displayed at first you have to determine how many pages are in the pdf. Then you have to start a loop... selecting page after page with the rendering. Your single "RenderPage" won't do anything... ;-)


Hi Ingo, how do you create such a loop? I have a similar problem and I'm stuck at this point.

Edited by Mitchells - 16 Nov 21 at 2:22PM
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Ingo View Drop Down
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Points: 3524 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ingo Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jan 18 at 12:53AM
Hi Mitchel,

Amelies' prob is different.
What she wanna see is possible if the window of the pdf-reader is large and the page zoom is small.

What for a loop and for what do you need?
Did you read already in the online reference and the developer guide?
Perhaps we can help if you have an example...
But do it in a new thread.

Cheers and welcome here,
Ingo
Cheers,
Ingo
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