Volume 7A: XView Programming Manual

Example 6-1. The canvas_input.c program (continued)

} else if (view == newview) {

xv_set(xv_get(canvas, OPENWIN_VERTICAL_SCROLLBAR, view),

SCROLLBAR_VIEW_START, 0,

NULL);

xv_set(xv_get(canvas, OPENWIN_HORIZONTAL_SCROLLBAR, view),

SCROLLBAR_VIEW_START, 0,

NULL);

}

i++;

OPENWIN_END_EACH

sprintf(msg, "Total views: %d", i);

xv_set(frame, FRAME_RIGHT_FOOTER, msg, NULL);

}

/*

* Called when an event is received in an arbitrary paint window.

*/

void

my_event_proc(window, event, arg)

Xv_Window window;

Event *event;

Notify_arg arg;

{

register char *p = msg;

*p = 0;

/* test to see if a function key has been hit */

if (event_is_key_left(event))

sprintf(p, "(L%d) ", event_id(event) – KEY_LEFTFIRST + 1);

else if (event_is_key_top(event))

sprintf(p, "(T%d) ", event_id(event) – KEY_TOPFIRST + 1);

else if (event_is_key_right(event))

sprintf(p, "(R%d) ", event_id(event) – KEY_RIGHTFIRST + 1);

else if (event_id(event) == KEY_BOTTOMLEFT)

strcpy(p, "bottom left ");

else if (event_id(event) == KEY_BOTTOMRIGHT)

strcpy(p, "bottom right ");

p += strlen(p);

if (event_is_ascii(event)) {

/*

* note that shift modifier is reflected in the event code by

* virtue of the char printed is upper/lower case.

*/

sprintf(p, "Keyboard: key ’%c’ (%d) %s at %d,%d",

event_action(event), event_action(event),

event_is_down(event)? "pressed" : "released",

event_x(event), event_y(event));

} else switch (event_action(event)) {

case ACTION_CLOSE :

xv_set(frame, FRAME_CLO ...