cvs.zerfleddert.de Git - micropolis/blob - src/tk/tkcvwind.c

   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 }