Volume 7A: XView Programming Manual

Example F-1. The item_move.c program (continued)

create_item(item, event)

Panel_item item;

Event *event;

{

Xv_pkg *pkg;

Panel panel = (Panel)xv_get(item, XV_KEY_DATA, PANEL_KEY);

Frame frame = (Frame)xv_get(item, XV_KEY_DATA, FRAME_KEY);

Panel_item pi, pkg_item;

char buf[64];

int selected();

pkg_item = (Panel_item)xv_get(item, XV_KEY_DATA, PACKAGE_KEY);

(void) strncpy(buf, (char *)xv_get(item, PANEL_VALUE), sizeof buf);

if (!buf[0 ])

return PANEL_NONE;

switch((int)xv_get(pkg_item, PANEL_VALUE)) {

case 1: pkg = PANEL_MESSAGE; break;

case 2: pkg = PANEL_TEXT; break;

default: pkg = PANEL_BUTTON;

}

/* loop thru all panel items and check for item with same name */

PANEL_EACH_ITEM(panel, pi)

if (!strcmp(buf, (char *)xv_get(pi, PANEL_LABEL_STRING))) {

xv_set(frame, FRAME_LEFT_FOOTER, "Label Taken", NULL);

return PANEL_NONE;

}

PANEL_END_EACH

(void) xv_create(panel, pkg,

PANEL_LABEL_STRING, buf,

PANEL_NOTIFY_PROC, selected,

XV_KEY_DATA, FRAME_KEY, frame,

/* only for text items, but doesn’t affect other items */

PANEL_VALUE_DISPLAY_LENGTH, 10,

PANEL_LAYOUT, PANEL_HORIZONTAL,

NULL);

xv_set(item, PANEL_VALUE, "", NULL);

return PANEL_NEXT;

}

/*

* For panel buttons. return XV_OK or XV_ERROR if the item was

* selected using the left mouse button or not.

*/

int

selected(item, event)

Panel_item item;

Event *event;

{

Frame frame = (Frame)xv_get(item, XV_KEY_DATA, FRAME_KEY);

char buf[64];

if (event_action(event) == ACTION_SELECT) {

sprintf(b