test5.c

安装DDD之前

	if (space && doit)
		XmScrollBarSetValues(w, value, slider_size, inc, pinc, True);
	return space;
}

static void
auto_scroll(canvas, doit)
	canvas_p        canvas;
	Boolean         doit;
{
	Boolean         need_timer = False;

	if (canvas->v_scroll_direction != 0
	  && auto_scroll_bar(canvas->vsb, doit, canvas->v_scroll_direction))
		need_timer = True;
	if (canvas->h_scroll_direction != 0
	  && auto_scroll_bar(canvas->hsb, doit, canvas->h_scroll_direction))
		need_timer = True;
	if (need_timer)
		canvas->timer = XtAppAddTimeOut(
				   XtWidgetToApplicationContext(canvas->da),
					    100, timer, (XtPointer) canvas);
	else if (canvas->timer) {
		XtRemoveTimeOut(canvas->timer);
		canvas->timer = 0;
	}
}

static
void 
timer(closure, id)
	XtPointer       closure;
	XtIntervalId   *id;
{
	canvas_p        canvas = (canvas_p) closure;
	if (canvas->timer) {
		canvas->timer = 0;
		auto_scroll(canvas, True);
	}
}

void
drag_start(w, event, params, num_params)
	Widget          w;
	XEvent         *event;
	String         *params;
	Cardinal       *num_params;
{
}

void
drag_motion(w, event, params, num_params)
	Widget          w;
	XEvent         *event;
	String         *params;
	Cardinal       *num_params;
{
	canvas_p        canvas;
	XMotionEvent   *e = (XMotionEvent *) event;
	Dimension       width, height;

	XtVaGetValues(w, XmNuserData, &canvas,
		      XmNwidth, &width,
		      XmNheight, &height, NULL);
	canvas->v_scroll_direction = 0;
	canvas->h_scroll_direction = 0;
	if (e->x >= (int) width)
		canvas->h_scroll_direction = 1;
	else if (e->x <= 0)
		canvas->h_scroll_direction = -1;
	if (e->y >= (int) height)
		canvas->v_scroll_direction = 1;
	else if (e->y <= 0)
		canvas->v_scroll_direction = -1;
	auto_scroll(canvas, False);
}

void
drag_stop(w, event, params, num_params)
	Widget          w;
	XEvent         *event;
	String         *params;
	Cardinal       *num_params;
{
	canvas_p        canvas;

	XtVaGetValues(w, XmNuserData, &canvas, NULL);
	if (canvas->timer) {
		XtRemoveTimeOut(canvas->timer);
		canvas->timer = 0;
	}
}
static void
set_clip(canvas, x, y, width, height)
	canvas_p        canvas;
	int             x, y, width, height;
{
	XRectangle      rect;
	rect.x = x;
	rect.y = y;
	rect.width = width;
	rect.height = height;
	XSetClipRectangles(XtDisplay(canvas->da), canvas->gc, 0, 0, &rect, 1,
			   YSorted);
}

void
expose(w, client_data, call_data)
	Widget          w;
	XtPointer       client_data;
	XtPointer       call_data;
{
	int             x, y;
	XExposeEvent   *e =
	&((XmDrawingAreaCallbackStruct *) call_data)->event->xexpose;
	canvas_p        canvas = (canvas_p) client_data;
	Display        *display = XtDisplay(canvas->da);

	if (!canvas->gc)
		adjust_size(canvas);
	create_gc(canvas);
	set_clip(canvas, e->x, e->y, e->width, e->height);
	x = ((canvas->x_offset + e->x) / 100) * 100;
	while (x < canvas->width
	       && x < canvas->x_offset + e->x + e->width) {
		y = ((canvas->y_offset + e->y) / 20) * 20;
		while (y < canvas->height
		       && y < canvas->y_offset + e->y + e->height + 10) {
			char            buf[24];
			sprintf(buf, "%d,%d", x, y);
			XDrawString(display, XtWindow(canvas->da), canvas->gc,
			    x - canvas->x_offset, y - canvas->y_offset + 10,
				    buf, strlen(buf));
			y = y + 20;
		}
		x = x + 100;
	}
}

void 
graphics_expose(w, client_data, event, continue_to_dispatch)
	Widget          w;
	XtPointer       client_data;
	XEvent         *event;
	Boolean        *continue_to_dispatch;
{
	if (event->type == GraphicsExpose) {
		XmDrawingAreaCallbackStruct cb;
		cb.reason = XmCR_EXPOSE;
		cb.event = event;
		cb.window = XtWindow(w);
		XtCallCallbacks(w, XmNexposeCallback, &cb);
	}
}
void 
create_gc(canvas)
	canvas_p        canvas;
{
	if (canvas->gc == 0) {
		XGCValues       values;
		/* Create GC with foreground taken from the XmDrawingArea */
		XtVaGetValues(canvas->da,
			      XmNforeground, &values.foreground, NULL);
		canvas->gc = XCreateGC(XtDisplay(canvas->da),
				       XtWindow(canvas->da),
				       GCForeground, &values);
	}
}
Widget
create_appshell(display, app_name, app_argc, app_argv, canvas)
	Display        *display;
	char           *app_name;
	int             app_argc;
	char          **app_argv;
	canvas_p        canvas;
{
	Widget          appshell = (Widget) NULL;
	Widget          form = (Widget) NULL;
	Widget          bigger = (Widget) NULL;
	Widget          scrollw = (Widget) NULL;
	Arg             al[64];	/* Arg List */
	register int    ac = 0;	/* Arg Count */
	XmString        xmstring;
	Widget          children[3];

	XtSetArg(al[ac], XmNallowShellResize, TRUE); ac++;
	XtSetArg(al[ac], XmNtitle, "Application Scrolling"); ac++;
	XtSetArg(al[ac], XmNargc, app_argc); ac++;
	XtSetArg(al[ac], XmNargv, app_argv); ac++;
	XtSetArg(al[ac], XmNwidth, 200); ac++;
	XtSetArg(al[ac], XmNheight, 200); ac++;
	appshell = XtAppCreateShell(app_name, "XApplication", applicationShellWidgetClass, display, al, ac);
	ac = 0;
	XtSetArg(al[ac], XmNautoUnmanage, FALSE); ac++;
	form = XmCreateForm(appshell, "form", al, ac);
	ac = 0;
	xmstring = XmStringCreateLtoR("Expand drawing", (XmStringCharSet) XmFONTLIST_DEFAULT_TAG);
	XtSetArg(al[ac], XmNlabelString, xmstring); ac++;
	bigger = XmCreatePushButton(form, "bigger", al, ac);
	XmStringFree(xmstring);

	XtAddCallback(bigger, XmNactivateCallback, expand,
		      (XtPointer) canvas);
	canvas->width = 200;
	canvas->height = 200;

	ac = 0;
	XtSetArg(al[ac], XmNscrollingPolicy, XmAPPLICATION_DEFINED); ac++;
	scrollw = XmCreateScrolledWindow(form, "scrollw", al, ac);
	ac = 0;
	XtSetArg(al[ac], XmNorientation, XmHORIZONTAL); ac++;
	canvas->hsb = XmCreateScrollBar(scrollw, "horscrollbar", al, ac);
	ac = 0;
	XtSetArg(al[ac], XmNorientation, XmVERTICAL); ac++;
	canvas->vsb = XmCreateScrollBar(scrollw, "vertscrollbar", al, ac);

	/* Store canvas pointer in the userData resource for use in autopan */
	ac = 0;
	XtSetArg(al[ac], XmNuserData, (XtPointer)canvas); ac++;
	canvas->da = XmCreateDrawingArea(scrollw, "da", al, ac);

	/* Register actions for XmDrawingArea autopanning */
	register_actions(canvas);

	/* Callbacks as before */
	XtAddCallback (canvas->hsb, XmNdragCallback, hsb_changed,
		      (XtPointer)canvas);
	XtAddCallback (canvas->vsb, XmNdragCallback, vsb_changed,
		      (XtPointer)canvas);

	XtAddEventHandler (canvas->da, NoEventMask, True,
		      graphics_expose, NULL);

	XtAddCallback(canvas->hsb, XmNvalueChangedCallback, hsb_changed,
		      (XtPointer) canvas);
	XtAddCallback(canvas->vsb, XmNvalueChangedCallback, vsb_changed,
		      (XtPointer) canvas);
	XtAddCallback(canvas->da, XmNexposeCallback, expose,
		      (XtPointer) canvas);
	XtAddCallback(canvas->da, XmNresizeCallback, resize,
		      (XtPointer) canvas);

	ac = 0;
	XtSetArg(al[ac], XmNtopAttachment, XmATTACH_FORM); ac++;
	XtSetArg(al[ac], XmNleftAttachment, XmATTACH_FORM); ac++;
	XtSetValues(bigger, al, ac);

	ac = 0;
	XtSetArg(al[ac], XmNtopAttachment, XmATTACH_WIDGET); ac++;
	XtSetArg(al[ac], XmNtopWidget, bigger); ac++;
	XtSetArg(al[ac], XmNleftAttachment, XmATTACH_FORM); ac++;
	XtSetArg(al[ac], XmNrightAttachment, XmATTACH_FORM); ac++;
	XtSetArg(al[ac], XmNbottomAttachment, XmATTACH_FORM); ac++;
	XtSetValues(scrollw, al, ac);
	ac = 0;
	children[ac++] = canvas->da;
	children[ac++] = canvas->hsb;
	children[ac++] = canvas->vsb;
	XtManageChildren(children, ac);
	ac = 0;
	children[ac++] = bigger;
	children[ac++] = scrollw;
	XtManageChildren(children, ac);
	ac = 0;
	XtManageChild(form);
	return appshell;
}

XtAppContext app_context;
Display *display;       /*  Display             */

int main (argc,argv)
int    argc;
char            **argv;
{
	canvas_t canvas;
	Widget appshell;
	XtSetLanguageProc ( (XtAppContext) NULL, (XtLanguageProc) NULL, (XtPointer) NULL );
	XtToolkitInitialize ();
	app_context = XtCreateApplicationContext ();
	display = XtOpenDisplay (app_context, NULL, argv[0], "XApplication",
				 NULL, 0, &argc, argv);
	if (!display)
	{
	    printf("%s: can't open display, exiting...\n", argv[0]);
	    exit (-1);
	}
	canvas.gc = 0;
	appshell = create_appshell(display, "XApplication", argc, &argv, &canvas);
	XtRealizeWidget(appshell);

  
{
    static XtWidgetGeometry Expected[] = {
   CWWidth | CWHeight            ,  500,  500,  200,  200, 0,0,0, /* form */
   CWWidth | CWHeight | CWX | CWY,    0,    0,   96,   25, 0,0,0, /* bigger */
   CWWidth | CWHeight | CWX | CWY,    0,   25,  200,  175, 0,0,0, /* scrollw */
   CWWidth | CWHeight | CWX | CWY,    0,  160,  181,   15, 0,0,0, /* horscrollbar */
   CWWidth | CWHeight | CWX | CWY,  185,    0,   15,  156, 0,0,0, /* vertscrollbar */
   CWWidth | CWHeight | CWX | CWY,    0,    0,  181,  156, 0,0,0, /* da */ 
    };
    PrintDetails(appshell,Expected);
};
  LessTifTestMainLoop(appshell);

	exit (0);
}