Problem
During long database operations I want to have an hour-glass cursor appear.
Solution
The XmNdbBusyCallback on Database Access widgets proovides the information you need to know when to display the busy cursor. All you need is a utility function to do that. The file hourCursor.c contains a routine which will change the cursor on all the top level shells in the application to a large hour-glass.
To hook this up to a Database Access widget, do the following:
#include "hourCursor.h"
/************************************************************************
* *
* Busy - our XmNdbBusyCallback handler. The busy callback is useful *
* for setting an hourglass cursor during a DBMS operation. *
* *
************************************************************************/
static void Busy(w, client, call)
Widget w; XtPointer client; XtPointer call;
{
XiDBDataSourceNotifyCallbackStruct *ns =
(XiDBDataSourceNotifyCallbackStruct *) call;
/* Verify the reason is right */
if(ns->reason != XiDB_NOTIFY_BUSY) return;
/* subreason: 0 for operation over,
* non-zero for operation starting
*/
HourGlass_SetShellCursorHierarchy(AppShell, ns->subreason);
XSync(XtDisplay(AppShell), False);
}
... When you create your Database Access widget
Widget theDB, parent;
...
theDB = XtVaCreateWidget("theDB",
xiDBSybaseDataSrcWidgetClass, parent,
NULL);
/* Track DBMS operations so we can put up an hourglass cursor */
XtAddCallback(theDB, XmNdbBusyCallback, Busy, (XtPointer) 0);
...
