Knowledge Base

How can you get a callback for the scroll bar on a multitext widget?   ________________________________________________________________________ Applicable Environment ________________________________________________________________________ Topic: callback for scroll bar on a multitext widget SDP: 6.4.1 Target: Any supported target ________________________________________________________________________ Recommendation ________________________________________________________________________ With the Pt_Multitext widget you need to first find the Scroll Bar widget. This can be done using the PtWidgetFamily function on the multitext widget. Once you have identified the scroll bar you can then attach a callback to it to be alerted to when it is moved. static int my_callback( PtWidget_t *widget, void *data, PtCallbackInfo_t *cbinfo ) { PtScrollbarCallback_t *cbdata = (PtScrollbarCallback_t*) cbinfo->cbdata; fprintf (stderr, "Current Scroll Position is %d\n", cbdata->position); return (Pt_CONTINUE); } int find_scrollbar ( PtWidget_t *widget, ApInfo_t *apinfo, PtCallbackInfo_t *cbinfo ) { PtWidget_t *root; PtWidget_t *current; root = current = widget; while (current = PtWidgetFamily (root, current)) if (PtWidgetIsClass (current, PtScrollbar)) PtAddCallback (current, Pt_CB_SCROLL_MOVE, my_callback, 0); return( Pt_CONTINUE ); } ________________________________________________________________________ NOTE: This entry has been validated against the SDP version listed above. Use caution when considering this advice for any other SDP version. For supported releases, please reach out to QNX Technical Support if you have any questions/concerns. ________________________________________________________________________ Related Attachments  None Found

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