#include <Xm/CutPaste.h>
#include <Xm/RowColumn.h>
#include <Xm/PushB.h>
#include <stdio.h>

static void to_clipbd(), from_clipbd();

void
main(int argc, char **argv)
{
    Widget toplevel, rowcol, button;
    XtAppContext app;

    XtSetLanguageProc(NULL, NULL, NULL);

    toplevel = XtVaAppInitialize(&app, "Demo", NULL, 0,
				 &argc, argv, NULL, NULL);

    rowcol = XtVaCreateWidget("rowcol", xmRowColumnWidgetClass,
			      toplevel, NULL);

    button = XtVaCreateManagedWidget("button1", xmPushButtonWidgetClass,
				     rowcol, XtVaTypedArg, XmNlabelString,
				     XmRString, "Copy To Clipboard", 18,
				     NULL);

    XtAddCallback(button, XmNactivateCallback, to_clipbd, "text");

    button = XtVaCreateManagedWidget("button2", xmPushButtonWidgetClass,
				     rowcol, XtVaTypedArg, XmNlabelString,
				     XmRString, "Retrieve From Clipboard", 24,
				     NULL);

    XtAddCallback(button, XmNactivateCallback, from_clipbd, NULL);

    XtManageChild(rowcol);
    XtRealizeWidget(toplevel);
    XtAppMainLoop(app);
}

static void
to_clipbd(Widget w, XtPointer client_data, XtPointer call_data)
{
    long item_id = 0;
    int status;
    XmString clip_label;
    char buf[32];
    static int cnt;
    Display *dpy = XtDisplayOfObject(w);
    Window window = XtWindowOfObject(w);
    char *data = (char *)client_data;

    sprintf(buf, "%s-%d", data, ++cnt);

    clip_label = XmStringCreateLocalized("to_clipbd");

    do {
	status = XmClipboardStartCopy(dpy, window, clip_label, CurrentTime,
				      NULL, NULL, &item_id);
    } while (status == ClipboardLocked);

    XmStringFree(clip_label);

    do {
	status = XmClipboardCopy(dpy, window, item_id, "STRING",
				buf, (long)strlen(buf)+1, cnt, NULL);
    } while (status == ClipboardLocked);


    do {
	status = XmClipboardEndCopy(dpy, window, item_id);
    } while (status == ClipboardLocked);

    printf("copied: '%s' to clipboard\n", buf);
}

static void
from_clipbd(Widget w, XtPointer client_data, XtPointer call_data)
{
    int status;
    long private_id;
    char buf[32];
    Display *dpy = XtDisplayOfObject(w);
    Window window = XtWindowOfObject(w);

    do {
	status = XmClipboardRetrieve(dpy, window, "STRING",
				     buf, sizeof(buf), NULL, &private_id);
    } while (status == ClipboardLocked);

    if (status == ClipboardSuccess)
	printf("Retrieved '%s' (private_id %ld) from clipboard.\n",
	       buf, private_id);
}