Enable or disable touch zooming.
void pdfEnableTouchZoom(PDFViewerHandle viewer, BOOL enabled)
This function enables (if enabled is true) or disables (if enabled is false) touch zooming. This is only useful on a Windows system with a touch screen.

If enabled, two-finger "pinch" gestures will trigger the pdfSetTouchZoomCbk callback.

The default setting is enabled. Disabling touch zooming can be useful when your application is in a mode that allows selecting or highlighting text, and where zooming would be inappropriate.

IMPORTANT: Calling pdfEnableTouchZoom with true only enables the events; it does not perform any zooming. See pdfSetTouchZoomCbk for more information.

pdfEnableTouchZoom(viewer, FALSE);