/usr/share/doc/xviewg/examples/dnd/source2.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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* source2.c - Example of how to source a drag and drop operation.
*
*/
#include <stdio.h>
#include <sys/types.h>
#include <xview/xview.h>
#include <xview/frame.h>
#include <xview/canvas.h>
#include <xview/cursor.h>
#include <xview/dragdrop.h>
#include <xview/sel_pkg.h>
#include <xview/xv_xrect.h>
#include <xview/svrimage.h>
#include <X11/Xlib.h>
#include <X11/Xatom.h>
unsigned short drop_icon[] = {
#include "./drop.icon"
};
#if defined(__linux__) && !defined(NBBY)
#define NBBY 8
#endif
#define POINT_IN_RECT(px, py, rx, ry, rw, rh) \
((px) >= rx && (py) >= ry && \
(px) < rx+rw && (py) < ry+rh)
#define STRING_MSG "fe-line: adj. Of the cat family; catlike; sly."
#define HOST 0
#define STRING 1
#define LENGTH 2
Frame frame;
Canvas canvas;
Dnd dnd;
Cursor arrow_cursor;
Server_image arrow_image;
Server_image arrow_image_mask;
Server_image box_image;
Server_image drop_here_image;
Cursor drop_here_cursor;
Selection_owner sel;
Selection_item selItem[5];
Atom selAtom[5];
int SelectionConvert();
extern int sel_convert_proc();
static XColor fg = {0L, 65535, 65535, 0};
static XColor bg = {0L, 65535, 0, 0};
typedef struct _DragObject {
Server_image image;
int x, y;
unsigned int w, h;
int inverted;
} DragObject;
DragObject dO;
main(argc, argv)
int argc;
char **argv;
{
void EventProc(),
SelectionLose(),
PaintCanvas();
Xv_Server server;
Cursor arrow_cursor;
server = xv_init(XV_INIT_ARGC_PTR_ARGV, &argc, argv, 0);
frame = xv_create((Window)NULL, FRAME,
XV_LABEL, "Drag & Drop Source",
XV_X, 10,
XV_Y, 10,
FRAME_SHOW_FOOTER, True,
0);
canvas = xv_create(frame, CANVAS,
XV_HEIGHT, 100,
XV_WIDTH, 300,
CANVAS_REPAINT_PROC, PaintCanvas,
CANVAS_X_PAINT_WINDOW, TRUE,
0);
xv_set(canvas_paint_window(canvas),
WIN_BIT_GRAVITY, ForgetGravity,
WIN_CONSUME_EVENTS,
WIN_MOUSE_BUTTONS,
LOC_DRAG,
WIN_RESIZE,
0,
WIN_EVENT_PROC, EventProc,
0);
/* Create the drag cursor images */
arrow_image = xv_create(NULL, SERVER_IMAGE,
SERVER_IMAGE_BITMAP_FILE, "arrow2.bm", NULL);
arrow_image_mask = xv_create(NULL, SERVER_IMAGE,
SERVER_IMAGE_BITMAP_FILE, "arrow2_mask.bm", NULL);
/* Create a cursor to use in dnd ops. */
arrow_cursor = XCreatePixmapCursor(XV_DISPLAY_FROM_WINDOW(canvas),
(XID)xv_get(arrow_image, XV_XID),
(XID)xv_get(arrow_image_mask, XV_XID),
&fg, &bg, 4, 4);
drop_here_image = xv_create(NULL, SERVER_IMAGE,
XV_WIDTH, 64,
XV_HEIGHT, 64,
SERVER_IMAGE_BITS, drop_icon,
0);
drop_here_cursor = XCreatePixmapCursor(XV_DISPLAY_FROM_WINDOW(canvas),
(XID)xv_get(drop_here_image, XV_XID),
(XID)xv_get(drop_here_image, XV_XID),
&fg, &bg, 32, 32);
dO.image = xv_create(NULL, SERVER_IMAGE,
SERVER_IMAGE_BITMAP_FILE, "arrowb2.bm", NULL);
dO.w = xv_get(dO.image, XV_WIDTH);
dO.h = xv_get(dO.image, XV_HEIGHT);
dO.inverted = False;
CreateSelection(server, canvas_paint_window(canvas));
window_fit(frame);
xv_main_loop(frame);
exit(0);
}
CreateSelection(server, window)
Xv_Server server;
Xv_object window;
{
char name[15];
int len;
void SelectionLose();
/* Primary selection, acquired whenever the arrow
* bitmap is selected by the user.
* This is not a requirement for dnd to work.
*/
sel = xv_create(window, SELECTION_OWNER,
SEL_RANK, XA_PRIMARY,
SEL_LOSE_PROC, SelectionLose,
0);
/* Create the drag and drop object. */
dnd = xv_create(window, DRAGDROP,
DND_TYPE, DND_COPY,
DND_X_CURSOR, arrow_cursor,
DND_ACCEPT_X_CURSOR, drop_here_cursor,
SEL_CONVERT_PROC, SelectionConvert,
0);
/* Associate some selection items with the dnd object.*/
(void) gethostname(name, 15);
selAtom[HOST] = (Atom)xv_get(server, SERVER_ATOM, "HOST_NAME");
selItem[HOST] = xv_create(dnd, SELECTION_ITEM,
SEL_TYPE, selAtom[HOST],
SEL_DATA, (Xv_opaque)name,
0);
selAtom[STRING] = (Atom)XA_STRING;
selItem[STRING] = xv_create(dnd, SELECTION_ITEM,
SEL_TYPE, selAtom[STRING],
SEL_DATA, (Xv_opaque)STRING_MSG,
0);
len = strlen(STRING_MSG);
selAtom[LENGTH] = (Atom)xv_get(server, SERVER_ATOM, "LENGTH");
selItem[LENGTH] = xv_create(dnd, SELECTION_ITEM,
SEL_TYPE, selAtom[LENGTH],
SEL_FORMAT, sizeof(int)*NBBY,
SEL_LENGTH, 1,
SEL_DATA, (Xv_opaque)&len,
0);
}
void
EventProc(window, event)
Xv_Window window;
Event *event;
{
static int drag_pixels = 0;
static int dragging = False;
switch (event_action(event)) {
case ACTION_SELECT:
if (event_is_down(event)) {
dragging = False;
/* If the user selected our dnd object, highlight
* the box and acquire the primary selection.
*/
if (POINT_IN_RECT(event_x(event), event_y(event),
dO.x, dO.y, dO.w, dO.h)) {
xv_set(sel, SEL_OWN, True, 0);
dO.inverted = True;
PaintObject(dO, xv_get(window, XV_XID),
XV_DISPLAY_FROM_WINDOW(window));
} else
/* If the user selected outside of the dnd object,
* de-highlight the object. And release the primary
* selection.
*/
xv_set(sel, SEL_OWN, False, 0);
} else
drag_pixels = 0;
break;
case LOC_DRAG:
/* If the user dragged at least five pixel over our
* dnd object, begin the dnd operation.
*/
if (event_left_is_down(event)) {
if (POINT_IN_RECT(event_x(event),
event_y(event),dO.x,dO.y,dO.w,dO.h))
dragging = True;
if (dragging && drag_pixels++ == 5) {
xv_set(frame, FRAME_LEFT_FOOTER, "Drag and Drop:", 0);
switch (dnd_send_drop(dnd)) {
case XV_OK:
xv_set(frame, FRAME_LEFT_FOOTER,
"Drag and Drop: Began", 0);
break;
case DND_TIMEOUT:
xv_set(frame, FRAME_LEFT_FOOTER,
"Drag and Drop: Timed Out",0);
break;
case DND_ILLEGAL_TARGET:
xv_set(frame, FRAME_LEFT_FOOTER,
"Drag and Drop: Illegal Target",0);
break;
case DND_SELECTION:
xv_set(frame, FRAME_LEFT_FOOTER,
"Drag and Drop: Bad Selection",0);
break;
case DND_ROOT:
xv_set(frame, FRAME_LEFT_FOOTER,
"Drag and Drop: Root Window",0);
break;
case XV_ERROR:
xv_set(frame, FRAME_LEFT_FOOTER,
"Drag and Drop: Failed",0);
break;
}
drag_pixels = 0;
}
}
break;
}
}
PaintObject(object, win, dpy)
DragObject object;
Window win;
Display *dpy;
{
static GC gc;
static int gcCreated = False;
if (!gcCreated) {
XGCValues gcv;
gcv.stipple = (Pixmap) xv_get(object.image, XV_XID);
gcv.fill_style = FillStippled;
gc = XCreateGC(dpy, win, GCStipple|GCForeground|GCBackground|
GCFillStyle, &gcv);
XSetForeground(dpy, gc, BlackPixel(dpy, XDefaultScreen(dpy)));
XSetBackground(dpy, gc, WhitePixel(dpy, XDefaultScreen(dpy)));
}
if (object.inverted) {
XSetFillStyle(dpy, gc, FillSolid);
XDrawRectangle(dpy, win, gc, object.x-1, object.y-1, 66, 66);
XSetFillStyle(dpy, gc, FillStippled);
} else
XClearWindow(dpy, win);
XSetTSOrigin(dpy, gc, object.x, object.y);
XFillRectangle(dpy, win, gc, object.x, object.y, 65, 65);
}
void
PaintCanvas(canvas, paint_window, dpy, xwin, xrects)
Canvas canvas; /* unused */
Xv_Window paint_window; /* unused */
Display *dpy;
Window xwin;
Xv_xrectlist *xrects; /* unused */
{
unsigned width, height;
int x, y;
width = xv_get(paint_window, XV_WIDTH);
height = xv_get(paint_window, XV_HEIGHT);
x = (width/2)-(dO.w/2);
y = (height/2)-(dO.h/2);
dO.x = x;
dO.y = y;
PaintObject(dO, xwin, dpy);
}
/* The convert proc is called whenever someone makes a request to the dnd
* selection. Two cases we handle within the convert proc: DELETE and
* _SUN_DRAGDROP_DONE. Everything else we pass on to the default convert
* proc which knows about our selection items.
*/
int
SelectionConvert(seln, type, data, length, format)
Selection_owner seln;
Atom *type;
Xv_opaque *data;
unsigned long *length;
int *format;
{
Xv_Server server = XV_SERVER_FROM_WINDOW(xv_get(seln, XV_OWNER));
if (*type == (Atom)xv_get(server, SERVER_ATOM, "_SUN_SELECTION_END")) {
/* Destination has told us it has completed the drag
* and drop transaction. We should respond with a
* zero-length NULL reply.
*/
xv_set(dnd, SEL_OWN, False, 0);
xv_set(frame, FRAME_LEFT_FOOTER, "Drag and Drop: Completed",0);
*format = 32;
*length = 0;
*data = NULL;
*type = (Atom)xv_get(server, SERVER_ATOM, "NULL");
return(True);
} else if (*type == (Atom)xv_get(server, SERVER_ATOM, "DELETE")) {
/* Destination asked us to delete the selection.
* If it is appropriate to do so, we should.
*/
*format = 32;
*length = 0;
*data = NULL;
*type = (Atom)xv_get(server, SERVER_ATOM, "NULL");
return(True);
} else
/* Let the default convert procedure deal with the
* request.
*/
return(sel_convert_proc(seln, type, data, length, format));
}
/* When we lose the primary selection, this procedure is called. We dehigh-
* light our selection.
*/
void
SelectionLose(seln)
Selection_owner seln;
{
Xv_Window owner = xv_get(seln, XV_OWNER);
if (xv_get(seln, SEL_RANK) == XA_PRIMARY) {
dO.inverted = False;
PaintObject(dO, xv_get(owner, XV_XID), XV_DISPLAY_FROM_WINDOW(owner));
}
}
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