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1 /*
2 * tkCanvWind.c --
3 *
4 * This file implements window items for canvas widgets.
5 *
6 * Copyright 1992 Regents of the University of California.
7 * Permission to use, copy, modify, and distribute this
8 * software and its documentation for any purpose and without
9 * fee is hereby granted, provided that the above copyright
10 * notice appear in all copies. The University of California
11 * makes no representations about the suitability of this
12 * software for any purpose. It is provided "as is" without
13 * express or implied warranty.
14 */
15
16 #ifndef lint
17 static char rcsid[] = "$Header: /user6/ouster/wish/RCS/tkCanvWind.c,v 1.4 92/08/24 09:24:22 ouster Exp $ SPRITE (Berkeley)";
18 #endif
19
20 #include <stdio.h>
21 #include <math.h>
22 #include "tkint.h"
23 #include "tkcanvas.h"
24
25 /*
26 * The structure below defines the record for each window item.
27 */
28
29 typedef struct WindowItem {
30 Tk_Item header; /* Generic stuff that's the same for all
31 * types. MUST BE FIRST IN STRUCTURE. */
32 double x, y; /* Coordinates of positioning point for
33 * window. */
34 Tk_Window tkwin; /* Window associated with item. NULL means
35 * window has been destroyed. */
36 int width; /* Width to use for window (<= 0 means use
37 * window's requested width). */
38 int height; /* Width to use for window (<= 0 means use
39 * window's requested width). */
40 Tk_Anchor anchor; /* Where to anchor window relative to
41 * (x,y). */
42 Tk_Canvas *canvasPtr; /* Canvas containing this item. */
43 } WindowItem;
44
45 /*
46 * Information used for parsing configuration specs:
47 */
48
49 static Tk_ConfigSpec configSpecs[] = {
50 {TK_CONFIG_ANCHOR, "-anchor", (char *) NULL, (char *) NULL,
51 "center", Tk_Offset(WindowItem, anchor), TK_CONFIG_DONT_SET_DEFAULT},
52 {TK_CONFIG_PIXELS, "-height", (char *) NULL, (char *) NULL,
53 "0", Tk_Offset(WindowItem, height), TK_CONFIG_DONT_SET_DEFAULT},
54 {TK_CONFIG_CUSTOM, "-tags", (char *) NULL, (char *) NULL,
55 (char *) NULL, 0, TK_CONFIG_NULL_OK, &tkCanvasTagsOption},
56 {TK_CONFIG_PIXELS, "-width", (char *) NULL, (char *) NULL,
57 "0", Tk_Offset(WindowItem, width), TK_CONFIG_DONT_SET_DEFAULT},
58 {TK_CONFIG_WINDOW, "-window", (char *) NULL, (char *) NULL,
59 (char *) NULL, Tk_Offset(WindowItem, tkwin), TK_CONFIG_NULL_OK},
60 {TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
61 (char *) NULL, 0, 0}
62 };
63
64 /*
65 * Prototypes for procedures defined in this file:
66 */
67
68 static void ComputeWindowBbox _ANSI_ARGS_((Tk_Canvas *canvasPtr,
69 WindowItem *winItemPtr));
70 static int ConfigureWinItem _ANSI_ARGS_((
71 Tk_Canvas *canvasPtr, Tk_Item *itemPtr, int argc,
72 char **argv, int flags));
73 static int CreateWinItem _ANSI_ARGS_((Tk_Canvas *canvasPtr,
74 struct Tk_Item *itemPtr, int argc, char **argv));
75 static void DeleteWinItem _ANSI_ARGS_((Tk_Item *itemPtr));
76 static void DisplayWinItem _ANSI_ARGS_((Tk_Canvas *canvasPtr,
77 Tk_Item *itemPtr, Drawable dst));
78 static void ScaleWinItem _ANSI_ARGS_((Tk_Canvas *canvasPtr,
79 Tk_Item *itemPtr, double originX, double originY,
80 double scaleX, double scaleY));
81 static void TranslateWinItem _ANSI_ARGS_((Tk_Canvas *canvasPtr,
82 Tk_Item *itemPtr, double deltaX, double deltaY));
83 static int WinItemCoords _ANSI_ARGS_((Tk_Canvas *canvasPtr,
84 Tk_Item *itemPtr, int argc, char **argv));
85 static void WinItemRequestProc _ANSI_ARGS_((ClientData clientData,
86 Tk_Window tkwin));
87 static void WinItemStructureProc _ANSI_ARGS_((
88 ClientData clientData, XEvent *eventPtr));
89 static int WinItemToArea _ANSI_ARGS_((Tk_Canvas *canvasPtr,
90 Tk_Item *itemPtr, double *rectPtr));
91 static double WinItemToPoint _ANSI_ARGS_((Tk_Canvas *canvasPtr,
92 Tk_Item *itemPtr, double *pointPtr));
93
94 /*
95 * The structures below defines the rectangle and oval item types
96 * by means of procedures that can be invoked by generic item code.
97 */
98
99 Tk_ItemType TkWindowType = {
100 "window", /* name */
101 sizeof(WindowItem), /* itemSize */
102 CreateWinItem, /* createProc */
103 configSpecs, /* configSpecs */
104 ConfigureWinItem, /* configureProc */
105 WinItemCoords, /* coordProc */
106 DeleteWinItem, /* deleteProc */
107 DisplayWinItem, /* displayProc */
108 1, /* alwaysRedraw */
109 WinItemToPoint, /* pointProc */
110 WinItemToArea, /* areaProc */
111 (Tk_ItemPostscriptProc *) NULL, /* postscriptProc */
112 ScaleWinItem, /* scaleProc */
113 TranslateWinItem, /* translateProc */
114 (Tk_ItemIndexProc *) NULL, /* indexProc */
115 (Tk_ItemCursorProc *) NULL, /* cursorProc */
116 (Tk_ItemSelectionProc *) NULL, /* selectionProc */
117 (Tk_ItemInsertProc *) NULL, /* insertProc */
118 (Tk_ItemDCharsProc *) NULL, /* dTextProc */
119 (Tk_ItemType *) NULL /* nextPtr */
120 };
121 \f
122 /*
123 *--------------------------------------------------------------
124 *
125 * CreateWinItem --
126 *
127 * This procedure is invoked to create a new window
128 * item in a canvas.
129 *
130 * Results:
131 * A standard Tcl return value. If an error occurred in
132 * creating the item, then an error message is left in
133 * canvasPtr->interp->result; in this case itemPtr is
134 * left uninitialized, so it can be safely freed by the
135 * caller.
136 *
137 * Side effects:
138 * A new window item is created.
139 *
140 *--------------------------------------------------------------
141 */
142
143 static int
144 CreateWinItem(canvasPtr, itemPtr, argc, argv)
145 register Tk_Canvas *canvasPtr; /* Canvas to hold new item. */
146 Tk_Item *itemPtr; /* Record to hold new item; header
147 * has been initialized by caller. */
148 int argc; /* Number of arguments in argv. */
149 char **argv; /* Arguments describing rectangle. */
150 {
151 register WindowItem *winItemPtr = (WindowItem *) itemPtr;
152
153 if (argc < 2) {
154 Tcl_AppendResult(canvasPtr->interp, "wrong # args: should be \"",
155 Tk_PathName(canvasPtr->tkwin), "\" create ",
156 itemPtr->typePtr->name, " x y ?options?",
157 (char *) NULL);
158 return TCL_ERROR;
159 }
160
161 /*
162 * Initialize item's record.
163 */
164
165 winItemPtr->tkwin = NULL;
166 winItemPtr->width = 0;
167 winItemPtr->height = 0;
168 winItemPtr->anchor = TK_ANCHOR_CENTER;
169 winItemPtr->canvasPtr = canvasPtr;
170
171 /*
172 * Process the arguments to fill in the item record.
173 */
174
175 if ((TkGetCanvasCoord(canvasPtr, argv[0], &winItemPtr->x) != TCL_OK)
176 || (TkGetCanvasCoord(canvasPtr, argv[1],
177 &winItemPtr->y) != TCL_OK)) {
178 return TCL_ERROR;
179 }
180
181 if (ConfigureWinItem(canvasPtr, itemPtr, argc-2, argv+2, 0) != TCL_OK) {
182 DeleteWinItem(itemPtr);
183 return TCL_ERROR;
184 }
185 return TCL_OK;
186 }
187 \f
188 /*
189 *--------------------------------------------------------------
190 *
191 * WinItemCoords --
192 *
193 * This procedure is invoked to process the "coords" widget
194 * command on window items. See the user documentation for
195 * details on what it does.
196 *
197 * Results:
198 * Returns TCL_OK or TCL_ERROR, and sets canvasPtr->interp->result.
199 *
200 * Side effects:
201 * The coordinates for the given item may be changed.
202 *
203 *--------------------------------------------------------------
204 */
205
206 static int
207 WinItemCoords(canvasPtr, itemPtr, argc, argv)
208 register Tk_Canvas *canvasPtr; /* Canvas containing item. */
209 Tk_Item *itemPtr; /* Item whose coordinates are to be
210 * read or modified. */
211 int argc; /* Number of coordinates supplied in
212 * argv. */
213 char **argv; /* Array of coordinates: x1, y1,
214 * x2, y2, ... */
215 {
216 register WindowItem *winItemPtr = (WindowItem *) itemPtr;
217
218 if (argc == 0) {
219 sprintf(canvasPtr->interp->result, "%g %g", winItemPtr->x,
220 winItemPtr->y);
221 } else if (argc == 2) {
222 if ((TkGetCanvasCoord(canvasPtr, argv[0], &winItemPtr->x) != TCL_OK)
223 || (TkGetCanvasCoord(canvasPtr, argv[1],
224 &winItemPtr->y) != TCL_OK)) {
225 return TCL_ERROR;
226 }
227 ComputeWindowBbox(canvasPtr, winItemPtr);
228 } else {
229 sprintf(canvasPtr->interp->result,
230 "wrong # coordinates: expected 0 or 2, got %d",
231 argc);
232 return TCL_ERROR;
233 }
234 return TCL_OK;
235 }
236 \f
237 /*
238 *--------------------------------------------------------------
239 *
240 * ConfigureWinItem --
241 *
242 * This procedure is invoked to configure various aspects
243 * of a window item, such as its anchor position.
244 *
245 * Results:
246 * A standard Tcl result code. If an error occurs, then
247 * an error message is left in canvasPtr->interp->result.
248 *
249 * Side effects:
250 * Configuration information may be set for itemPtr.
251 *
252 *--------------------------------------------------------------
253 */
254
255 static int
256 ConfigureWinItem(canvasPtr, itemPtr, argc, argv, flags)
257 Tk_Canvas *canvasPtr; /* Canvas containing itemPtr. */
258 Tk_Item *itemPtr; /* Window item to reconfigure. */
259 int argc; /* Number of elements in argv. */
260 char **argv; /* Arguments describing things to configure. */
261 int flags; /* Flags to pass to Tk_ConfigureWidget. */
262 {
263 register WindowItem *winItemPtr = (WindowItem *) itemPtr;
264 Tk_Window oldWindow;
265
266 oldWindow = winItemPtr->tkwin;
267 if (Tk_ConfigureWidget(canvasPtr->interp, canvasPtr->tkwin,
268 configSpecs, argc, argv, (char *) winItemPtr, flags) != TCL_OK) {
269 return TCL_ERROR;
270 }
271
272 /*
273 * A few of the options require additional processing.
274 */
275
276 if (oldWindow != winItemPtr->tkwin) {
277 if (oldWindow != NULL) {
278 Tk_DeleteEventHandler(oldWindow, StructureNotifyMask,
279 WinItemStructureProc, (ClientData) winItemPtr);
280 Tk_ManageGeometry(oldWindow, (Tk_GeometryProc *) NULL,
281 (ClientData) NULL);
282 Tk_UnmapWindow(oldWindow);
283 }
284 if (winItemPtr->tkwin != NULL) {
285 Tk_Window ancestor, parent;
286
287 /*
288 * Make sure that the canvas is either the parent of the
289 * window associated with the item or a descendant of that
290 * parent. Also, don't allow a top-level window to be
291 * managed inside a canvas.
292 */
293
294 parent = Tk_Parent(winItemPtr->tkwin);
295 for (ancestor = canvasPtr->tkwin; ;
296 ancestor = Tk_Parent(ancestor)) {
297 if (ancestor == parent) {
298 break;
299 }
300 if (((Tk_FakeWin *) (ancestor))->flags & TK_TOP_LEVEL) {
301 badWindow:
302 Tcl_AppendResult(canvasPtr->interp, "can't use ",
303 Tk_PathName(winItemPtr->tkwin),
304 " in a window item of this canvas", (char *) NULL);
305 winItemPtr->tkwin = NULL;
306 return TCL_ERROR;
307 }
308 }
309 if (((Tk_FakeWin *) (winItemPtr->tkwin))->flags & TK_TOP_LEVEL) {
310 goto badWindow;
311 }
312 if (winItemPtr->tkwin == canvasPtr->tkwin) {
313 goto badWindow;
314 }
315 Tk_CreateEventHandler(winItemPtr->tkwin, StructureNotifyMask,
316 WinItemStructureProc, (ClientData) winItemPtr);
317 Tk_ManageGeometry(winItemPtr->tkwin, WinItemRequestProc,
318 (ClientData) winItemPtr);
319 }
320 }
321
322 ComputeWindowBbox(canvasPtr, winItemPtr);
323
324 return TCL_OK;
325 }
326 \f
327 /*
328 *--------------------------------------------------------------
329 *
330 * DeleteWinItem --
331 *
332 * This procedure is called to clean up the data structure
333 * associated with a window item.
334 *
335 * Results:
336 * None.
337 *
338 * Side effects:
339 * Resources associated with itemPtr are released.
340 *
341 *--------------------------------------------------------------
342 */
343
344 static void
345 DeleteWinItem(itemPtr)
346 Tk_Item *itemPtr; /* Item that is being deleted. */
347 {
348 register WindowItem *winItemPtr = (WindowItem *) itemPtr;
349
350 if (winItemPtr->tkwin != NULL) {
351 Tk_DeleteEventHandler(winItemPtr->tkwin, StructureNotifyMask,
352 WinItemStructureProc, (ClientData) winItemPtr);
353 Tk_ManageGeometry(winItemPtr->tkwin, (Tk_GeometryProc *) NULL,
354 (ClientData) NULL);
355 Tk_UnmapWindow(winItemPtr->tkwin);
356 }
357 }
358 \f
359 /*
360 *--------------------------------------------------------------
361 *
362 * ComputeWindowBbox --
363 *
364 * This procedure is invoked to compute the bounding box of
365 * all the pixels that may be drawn as part of a window item.
366 * This procedure is where the child window's placement is
367 * computed.
368 *
369 * Results:
370 * None.
371 *
372 * Side effects:
373 * The fields x1, y1, x2, and y2 are updated in the header
374 * for itemPtr.
375 *
376 *--------------------------------------------------------------
377 */
378
379 /* ARGSUSED */
380 static void
381 ComputeWindowBbox(canvasPtr, winItemPtr)
382 Tk_Canvas *canvasPtr; /* Canvas that contains item. */
383 register WindowItem *winItemPtr; /* Item whose bbox is to be
384 * recomputed. */
385 {
386 int width, height, x, y;
387
388 x = winItemPtr->x + 0.5;
389 y = winItemPtr->y + 0.5;
390
391 if (winItemPtr->tkwin == NULL) {
392 winItemPtr->header.x1 = winItemPtr->header.x2 = x;
393 winItemPtr->header.y1 = winItemPtr->header.y2 = y;
394 return;
395 }
396
397 /*
398 * Compute dimensions of window.
399 */
400
401 width = winItemPtr->width;
402 if (width <= 0) {
403 width = Tk_ReqWidth(winItemPtr->tkwin);
404 if (width <= 0) {
405 width = 1;
406 }
407 }
408 height = winItemPtr->height;
409 if (height <= 0) {
410 height = Tk_ReqHeight(winItemPtr->tkwin);
411 if (height <= 0) {
412 height = 1;
413 }
414 }
415
416 /*
417 * Compute location of window, using anchor information.
418 */
419
420 switch (winItemPtr->anchor) {
421 case TK_ANCHOR_N:
422 x -= width/2;
423 break;
424 case TK_ANCHOR_NE:
425 x -= width;
426 break;
427 case TK_ANCHOR_E:
428 x -= width;
429 y -= height/2;
430 break;
431 case TK_ANCHOR_SE:
432 x -= width;
433 y -= height;
434 break;
435 case TK_ANCHOR_S:
436 x -= width/2;
437 y -= height;
438 break;
439 case TK_ANCHOR_SW:
440 y -= height;
441 break;
442 case TK_ANCHOR_W:
443 y -= height/2;
444 break;
445 case TK_ANCHOR_NW:
446 break;
447 case TK_ANCHOR_CENTER:
448 x -= width/2;
449 y -= height/2;
450 break;
451 }
452
453 /*
454 * Store the information in the item header.
455 */
456
457 winItemPtr->header.x1 = x;
458 winItemPtr->header.y1 = y;
459 winItemPtr->header.x2 = x + width;
460 winItemPtr->header.y2 = y + height;
461 }
462 \f
463 /*
464 *--------------------------------------------------------------
465 *
466 * DisplayWinItem --
467 *
468 * This procedure is invoked to "draw" a window item in a given
469 * drawable. Since the window draws itself, we needn't do any
470 * actual redisplay here. However, this procedure takes care
471 * of actually repositioning the child window so that it occupies
472 * the correct screen position.
473 *
474 * Results:
475 * None.
476 *
477 * Side effects:
478 * The child window's position may get changed.
479 *
480 *--------------------------------------------------------------
481 */
482
483 /* ARGSUSED */
484 static void
485 DisplayWinItem(canvasPtr, itemPtr, drawable)
486 register Tk_Canvas *canvasPtr; /* Canvas that contains item. */
487 Tk_Item *itemPtr; /* Item to be displayed. */
488 Drawable drawable; /* Pixmap or window in which to draw
489 * item. */
490 {
491 register WindowItem *winItemPtr = (WindowItem *) itemPtr;
492 int x,y, width, height;
493 Tk_Window ancestor, parent;
494
495 if (winItemPtr->tkwin == NULL) {
496 return;
497 }
498 x = winItemPtr->header.x1 - canvasPtr->xOrigin;
499 y = winItemPtr->header.y1 - canvasPtr->yOrigin;
500 width = winItemPtr->header.x2 - winItemPtr->header.x1;
501 height = winItemPtr->header.y2 - winItemPtr->header.y1;
502
503 /*
504 * If the canvas isn't the parent of the window, then translate the
505 * coordinates from those of the canvas to those of the window's
506 * parent.
507 */
508
509 parent = Tk_Parent(winItemPtr->tkwin);
510 for (ancestor = canvasPtr->tkwin; ancestor != parent;
511 ancestor = Tk_Parent(ancestor)) {
512 x += Tk_X(ancestor) + Tk_Changes(ancestor)->border_width;
513 y += Tk_Y(ancestor) + Tk_Changes(ancestor)->border_width;
514 }
515
516 /*
517 * Reconfigure the window if it isn't already in the correct place.
518 */
519
520 if ((x != Tk_X(winItemPtr->tkwin)) || (y != Tk_Y(winItemPtr->tkwin))
521 || (width != Tk_Width(winItemPtr->tkwin))
522 || (height != Tk_Height(winItemPtr->tkwin))) {
523 Tk_MoveResizeWindow(winItemPtr->tkwin, x, y, (unsigned int) width,
524 (unsigned int) height);
525 }
526 if (!Tk_IsMapped(winItemPtr->tkwin)) {
527 Tk_MapWindow(winItemPtr->tkwin);
528 }
529 }
530 \f
531 /*
532 *--------------------------------------------------------------
533 *
534 * WinItemToPoint --
535 *
536 * Computes the distance from a given point to a given
537 * rectangle, in canvas units.
538 *
539 * Results:
540 * The return value is 0 if the point whose x and y coordinates
541 * are coordPtr[0] and coordPtr[1] is inside the window. If the
542 * point isn't inside the window then the return value is the
543 * distance from the point to the window.
544 *
545 * Side effects:
546 * None.
547 *
548 *--------------------------------------------------------------
549 */
550
551 /* ARGSUSED */
552 static double
553 WinItemToPoint(canvasPtr, itemPtr, pointPtr)
554 Tk_Canvas *canvasPtr; /* Canvas containing item. */
555 Tk_Item *itemPtr; /* Item to check against point. */
556 double *pointPtr; /* Pointer to x and y coordinates. */
557 {
558 register WindowItem *winItemPtr = (WindowItem *) itemPtr;
559 double x1, x2, y1, y2, xDiff, yDiff;
560
561 x1 = winItemPtr->header.x1;
562 y1 = winItemPtr->header.y1;
563 x2 = winItemPtr->header.x2;
564 y2 = winItemPtr->header.y2;
565
566 /*
567 * Point is outside rectangle.
568 */
569
570 if (pointPtr[0] < x1) {
571 xDiff = x1 - pointPtr[0];
572 } else if (pointPtr[0] > x2) {
573 xDiff = pointPtr[0] - x2;
574 } else {
575 xDiff = 0;
576 }
577
578 if (pointPtr[1] < y1) {
579 yDiff = y1 - pointPtr[1];
580 } else if (pointPtr[1] > y2) {
581 yDiff = pointPtr[1] - y2;
582 } else {
583 yDiff = 0;
584 }
585
586 return hypot(xDiff, yDiff);
587 }
588 \f
589 /*
590 *--------------------------------------------------------------
591 *
592 * WinItemToArea --
593 *
594 * This procedure is called to determine whether an item
595 * lies entirely inside, entirely outside, or overlapping
596 * a given rectangle.
597 *
598 * Results:
599 * -1 is returned if the item is entirely outside the area
600 * given by rectPtr, 0 if it overlaps, and 1 if it is entirely
601 * inside the given area.
602 *
603 * Side effects:
604 * None.
605 *
606 *--------------------------------------------------------------
607 */
608
609 /* ARGSUSED */
610 static int
611 WinItemToArea(canvasPtr, itemPtr, rectPtr)
612 Tk_Canvas *canvasPtr; /* Canvas containing item. */
613 Tk_Item *itemPtr; /* Item to check against rectangle. */
614 double *rectPtr; /* Pointer to array of four coordinates
615 * (x1, y1, x2, y2) describing rectangular
616 * area. */
617 {
618 register WindowItem *winItemPtr = (WindowItem *) itemPtr;
619
620 if ((rectPtr[2] <= winItemPtr->header.x1)
621 || (rectPtr[0] >= winItemPtr->header.x2)
622 || (rectPtr[3] <= winItemPtr->header.y1)
623 || (rectPtr[1] >= winItemPtr->header.y2)) {
624 return -1;
625 }
626 if ((rectPtr[0] <= winItemPtr->header.x1)
627 && (rectPtr[1] <= winItemPtr->header.y1)
628 && (rectPtr[2] >= winItemPtr->header.x2)
629 && (rectPtr[3] >= winItemPtr->header.y2)) {
630 return 1;
631 }
632 return 0;
633 }
634 \f
635 /*
636 *--------------------------------------------------------------
637 *
638 * ScaleWinItem --
639 *
640 * This procedure is invoked to rescale a rectangle or oval
641 * item.
642 *
643 * Results:
644 * None.
645 *
646 * Side effects:
647 * The rectangle or oval referred to by itemPtr is rescaled
648 * so that the following transformation is applied to all
649 * point coordinates:
650 * x' = originX + scaleX*(x-originX)
651 * y' = originY + scaleY*(y-originY)
652 *
653 *--------------------------------------------------------------
654 */
655
656 static void
657 ScaleWinItem(canvasPtr, itemPtr, originX, originY, scaleX, scaleY)
658 Tk_Canvas *canvasPtr; /* Canvas containing rectangle. */
659 Tk_Item *itemPtr; /* Rectangle to be scaled. */
660 double originX, originY; /* Origin about which to scale rect. */
661 double scaleX; /* Amount to scale in X direction. */
662 double scaleY; /* Amount to scale in Y direction. */
663 {
664 register WindowItem *winItemPtr = (WindowItem *) itemPtr;
665
666 winItemPtr->x = originX + scaleX*(winItemPtr->x - originX);
667 winItemPtr->y = originY + scaleY*(winItemPtr->y - originY);
668 if (winItemPtr->width > 0) {
669 winItemPtr->width = scaleY*winItemPtr->width;
670 }
671 if (winItemPtr->height > 0) {
672 winItemPtr->height = scaleY*winItemPtr->height;
673 }
674 ComputeWindowBbox(canvasPtr, winItemPtr);
675 }
676 \f
677 /*
678 *--------------------------------------------------------------
679 *
680 * TranslateWinItem --
681 *
682 * This procedure is called to move a rectangle or oval by a
683 * given amount.
684 *
685 * Results:
686 * None.
687 *
688 * Side effects:
689 * The position of the rectangle or oval is offset by
690 * (xDelta, yDelta), and the bounding box is updated in the
691 * generic part of the item structure.
692 *
693 *--------------------------------------------------------------
694 */
695
696 static void
697 TranslateWinItem(canvasPtr, itemPtr, deltaX, deltaY)
698 Tk_Canvas *canvasPtr; /* Canvas containing item. */
699 Tk_Item *itemPtr; /* Item that is being moved. */
700 double deltaX, deltaY; /* Amount by which item is to be
701 * moved. */
702 {
703 register WindowItem *winItemPtr = (WindowItem *) itemPtr;
704
705 winItemPtr->x += deltaX;
706 winItemPtr->y += deltaY;
707 ComputeWindowBbox(canvasPtr, winItemPtr);
708 }
709 \f
710 /*
711 *--------------------------------------------------------------
712 *
713 * WinItemStructureProc --
714 *
715 * This procedure is invoked whenever StructureNotify events
716 * occur for a window that's managed as part of a canvas window
717 * item. This procudure's only purpose is to clean up when
718 * windows are deleted.
719 *
720 * Results:
721 * None.
722 *
723 * Side effects:
724 * The window is disassociated from the window item when it is
725 * deleted.
726 *
727 *--------------------------------------------------------------
728 */
729
730 static void
731 WinItemStructureProc(clientData, eventPtr)
732 ClientData clientData; /* Pointer to record describing window item. */
733 XEvent *eventPtr; /* Describes what just happened. */
734 {
735 register WindowItem *winItemPtr = (WindowItem *) clientData;
736
737 if (eventPtr->type == DestroyNotify) {
738 winItemPtr->tkwin = NULL;
739 }
740 }
741 \f
742 /*
743 *--------------------------------------------------------------
744 *
745 * WinItemRequestProc --
746 *
747 * This procedure is invoked whenever a window that's associated
748 * with a window canvas item changes its requested dimensions.
749 *
750 * Results:
751 * None.
752 *
753 * Side effects:
754 * The size and location on the screen of the window may change,
755 * depending on the options specified for the window item.
756 *
757 *--------------------------------------------------------------
758 */
759
760 /* ARGSUSED */
761 static void
762 WinItemRequestProc(clientData, tkwin)
763 ClientData clientData; /* Pointer to record for window item. */
764 Tk_Window tkwin; /* Window that changed its desired
765 * size. */
766 {
767 WindowItem *winItemPtr = (WindowItem *) clientData;
768
769 ComputeWindowBbox(winItemPtr->canvasPtr, winItemPtr);
770 DisplayWinItem(winItemPtr->canvasPtr, (Tk_Item *) winItemPtr,
771 (Drawable) None);
772 }
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