Button that rotates ALL pages clockwise continuously

Technical Support
1

Product: PDFTron

Please give a brief summary of your issue:
I’ve pushed a button to header and I wish for the button to rotate all pages clockwise, every time the button is clicked. The implementation that I have rotates all pages clockwise only once. I know there’s already controls that has this functionality but I’m creating my own header where this button is not in the overlay.

  UI.setHeaderItems(header => {
    header.push(
      {
        type: 'actionButton',
        img: '',
        onClick: () => {
          instance.UI.setLayoutMode(instance.UI.LayoutMode.Facing);
        }
      },
      {
        type: 'actionButton',
        img: '',
        onClick: () => {
          Core.documentViewer.setRotation(1);
        }
      }
    );
  });
2

Hello there.

In order to rotate the pages incrementally, you need to get the current rotation and increment that. So, in the example you provided, instead of Core.documentViewer.setRotation(1);, you need to use Core.documentViewer.setRotation(Core.documentViewer.getRotation() + 1);.

Also please note that the valid rotation values are 0, 1, 2 and 3 corresponding to 0, 90, 180 and 270 degrees.

Let me know how this works for you and if you have any further questions.

Best Regards,
Diego Felix
Web Software Developer
PDFTron Systems, Inc.
www.pdftron.com

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