pdfSetRegionChangedCbk

Set a callback function for region changes.
void pdfSetRegionChangedCbk(PDFViewerHandle viewer, void (*cbk)(void *data, PDFRegionHandle region), void *data)
This function sets a callback which will be called when the user moves or resizes a highlighted region.

The function will be called with two arguments:

C:
void regionChangedCbk(void *data, PDFRegionHandle region) { /* a region has been resized ... */ } .... pdfSetRegionChangedCbk(viewer, &regionChangedCbk, NULL);
pdfSetRegionSelectedCbk
pdfSetRegionDoubleClickCbk