/usr/share/doc/xviewg/examples/canvas/canvas_input.c is in xview-examples 3.2p1.4-28.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* canvas_input.c --
* Display a canvas whose views may be split repeatedly. The event
* handler is installed for each view, so events are displayed in
* each paint window.
*/
#include <xview/xview.h>
#include <xview/canvas.h>
#include <xview/scrollbar.h>
#include <xview/xv_xrect.h>
Canvas canvas;
Frame frame;
char msg[128];
void init_split(), my_event_proc(), my_repaint_proc();
main(argc,argv)
int argc;
char *argv[];
{
/*
* Initialize, create base frame (with footers) and create canvas.
*/
xv_init(XV_INIT_ARGS, argc, argv, NULL);
frame = (Frame)xv_create(NULL,FRAME,
FRAME_LABEL, "Split View Windows.",
FRAME_SHOW_FOOTER, TRUE,
NULL);
canvas = (Canvas)xv_create(frame,CANVAS,
CANVAS_X_PAINT_WINDOW, TRUE,
OPENWIN_SPLIT,
OPENWIN_SPLIT_INIT_PROC, init_split,
NULL,
CANVAS_REPAINT_PROC, my_repaint_proc,
NULL);
(void) xv_create(canvas, SCROLLBAR,
SCROLLBAR_SPLITTABLE, TRUE,
SCROLLBAR_DIRECTION, SCROLLBAR_VERTICAL,
NULL);
(void) xv_create(canvas, SCROLLBAR,
SCROLLBAR_SPLITTABLE, TRUE,
SCROLLBAR_DIRECTION, SCROLLBAR_HORIZONTAL,
NULL);
/*
* Set input mask
*/
xv_set(canvas_paint_window(canvas),
WIN_CONSUME_EVENTS,
WIN_NO_EVENTS,
WIN_ASCII_EVENTS, KBD_USE, KBD_DONE,
LOC_DRAG, LOC_WINENTER, LOC_WINEXIT, WIN_MOUSE_BUTTONS,
NULL,
WIN_EVENT_PROC, my_event_proc,
NULL);
xv_main_loop(frame);
}
/*
* when a viewport is split, this routine is called.
*/
void
init_split(splitview, newview, pos)
Xv_Window splitview, newview;
int pos;
{
Xv_Window view;
int i = 0;
/*
* Determine view # from the new view and set its scrollbar to 0,0
*/
OPENWIN_EACH_VIEW(canvas, view)
if (view == splitview) {
/* identify the view # of the view the user just split. */
sprintf(msg, "Split view #%d", i+1);
xv_set(frame, FRAME_LEFT_FOOTER, msg, NULL);
} 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_CLOSED, TRUE, NULL);
break;
case ACTION_OPEN :
strcpy(p, "frame opened up");
break;
case ACTION_HELP :
strcpy(p, "Help (action ignored)");
break;
case ACTION_SELECT :
sprintf(p, "Button: Select (Left) %s at %d,%d",
event_is_down(event)? "pressed" : "released",
event_x(event), event_y(event));
break;
case ACTION_ADJUST :
sprintf(p, "Button: Adjust (Middle) %s at %d,%d",
event_is_down(event)? "pressed" : "released",
event_x(event), event_y(event));
break;
case ACTION_MENU :
sprintf(p, "Button: Menu (Right) %s at %d,%d",
event_is_down(event)? "pressed" : "released",
event_x(event), event_y(event));
break;
case SHIFT_RIGHT :
sprintf(p, "Keyboard: right shift %s",
event_is_down(event)? "pressed" : "released");
break;
case SHIFT_LEFT :
sprintf(p, "Keyboard: left shift %s",
event_is_down(event)? "pressed" : "released");
break;
case SHIFT_LEFTCTRL : case SHIFT_RIGHTCTRL :
sprintf(p, "Keyboard: control key %s",
event_is_down(event)? "pressed" : "released");
break;
case SHIFT_META :
sprintf(p, "Keyboard: meta key %s",
event_is_down(event)? "pressed" : "released");
break;
case SHIFT_ALT :
sprintf(p, "Keyboard: alt key %s",
event_is_down(event)? "pressed" : "released");
break;
case KBD_USE:
sprintf(p, "Keyboard: got keyboard focus");
break;
case KBD_DONE:
sprintf(p, "Keyboard: lost keyboard focus");
break;
case LOC_MOVE:
sprintf(p, "Pointer: moved to %d,%d",
event_x(event),event_y(event));
break;
case LOC_DRAG:
sprintf(p, "Pointer: dragged to %d,%d",
event_x(event), event_y(event));
break;
case LOC_WINENTER:
win_set_kbd_focus(window, xv_get(window, XV_XID));
sprintf(p, "Pointer: entered window at %d,%d",
event_x(event), event_y(event));
break;
case LOC_WINEXIT:
sprintf(p, "Pointer: exited window at %d,%d",
event_x(event), event_y(event));
break;
case WIN_RESIZE :
case WIN_REPAINT :
return;
default :
/* There are too many ACTION events to trap -- ignore the
* ones we're not interested in.
*/
return;
}
my_repaint_proc(canvas, window,
xv_get(canvas, XV_DISPLAY), xv_get(window, XV_XID), NULL);
}
/*
* my_repaint_proc()
* Called to repaint the canvas in response to damage events
* and the initial painting of the canvas window.
* Displays the keyboard, pointer and button message strings
* after erasing the previous messages.
*/
void
my_repaint_proc(canvas, pw, dpy, xwin, xrects)
Canvas canvas;
Xv_Window pw;
Display *dpy;
Window xwin;
Xv_xrectlist *xrects;
{
char win_num[16];
Xv_Window w;
int i = 0;
GC gc = DefaultGC(dpy, DefaultScreen(dpy));
/*
* Determine which paint window we're writing in.
*/
CANVAS_EACH_PAINT_WINDOW(canvas, w)
if (w == pw)
break;
i++;
CANVAS_END_EACH
sprintf(win_num, "(Window #%d) ", i+1);
XClearWindow(dpy, xwin);
XDrawString(dpy, xwin, gc, 25, 25, win_num, strlen(win_num));
XDrawString(dpy, xwin, gc, 25, 45, msg, strlen(msg));
}
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