Rotate Pages in PDF Viewer

• Oct 13, 2021
• 2 minutes to read

Rotate Pages Dialog

Right-click a page thumbnail and select the “Rotate Pages” menu item to invoke the dialog.

You can rotate the currently selected page or run a batch page rotation. Target page selection takes two steps:

• Choose all pages, the current page, or specific numbers/ranges.

• If multiple pages are selected, you can filter the pages further (process only odd/even pages, or only portrait/landscape pages).

Customize the Rotate Page Dialog’s Behavior

You can call the global ShowRotatePagesDialog procedure to invoke the “Rotate Pages” dialog in code. For instance, you can call the procedure in a UI element’s handler.

If you need to adjust or customize UI elements in the “Rotate Pages” dialog, derive a custom form from the TdxPDFViewerRotatePagesDialogForm class. Assign a reference to the custom dialog form class to the dxPDFViewerPasswordDialogClass global variable.

Rotate Pages in Code

Call a page object’s Rotate procedure. The following example loads the “Demo.pdf” document, turns the second page upside down, and saves the result to a different file:

Delphi

var
  ADocument: TdxPDFDocument;
begin
  ADocument := TdxPDFDocument.Create;
  try
    ADocument.LoadFromFile('Data\Demo.pdf');
    // Rotates the second page by 180 degrees
    ADocument.Pages[1].Rotate(ra180);
    ADocument.SaveToFile('Data\Result.pdf');
  finally
    ADocument.Free;
  end; 

C++

  TdxPDFDocument *ADocument = new TdxPDFDocument();
  try
  {
    ADocument->LoadFromFile("Data\\Demo.pdf");
    // Rotates the second page by 180 degrees
    ADocument->Pages->Items[1]->Rotate(ra180);
    ADocument->SaveToFile("Data\\Result.pdf");
  }
  __finally
    delete ADocument;