pdfSetPageChangeCbk

This function sets a callback function which will be called whenever the viewer displays a new page.

This callback is useful, for example, to update a "current page number" display in your application.

The page change callback is called whenever the displayed page number changes. This can happen in several ways:

• the user hits the Page Up or Page Down key
• the user clicks on a hyperlink to a different page (or different PDF file)
• any of the "goto" or "scroll" functions are called

The callback receives two arguments:

• data: the value passed in the data argument to pdfSetPageChangeCbk
• page: the new page number

In continuous mode, this callback is triggered when the page displayed at the top of the window changes. See pdfSetMidPageChangeCbk for a callback triggered when the page in the middle of the window changes.