/*
 * tkoPathCanvWind.c --
 *
 *	This file implements window items for canvas widgets.
 *
 * Copyright (c) 1992-1994 The Regents of the University of California.
 * Copyright (c) 1994-1997 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution of
 * this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 */

#include "tkoPath.h"

/*
 * The structure below defines the record for each window item.
 */

typedef struct WindowItem {
    Tk_PathItem header;        /* Generic stuff that's the same for all
                                * types.  MUST BE FIRST IN STRUCTURE. */
    double x, y;               /* Coordinates of positioning point for
                                * window. */
    Tk_Window tkwin;           /* Window associated with item.  NULL means
                                * window has been destroyed. */
    int width;                 /* Width to use for window (<= 0 means use
                                * window's requested width). */
    int height;                /* Width to use for window (<= 0 means use
                                * window's requested width). */
    Tk_Anchor anchor;          /* Where to anchor window relative to
                                * (x,y). */
    Tk_PathCanvas canvas;      /* Canvas containing this item. */
} WindowItem;

#define PATH_DEF_STATE "normal"

static const char *stateStrings[] = {
    "active", "disabled", "normal", "hidden", NULL
};

static Tk_ObjCustomOption tagsCO = {
    "tags",
    Tk_PathCanvasTagsOptionSetProc,
    Tk_PathCanvasTagsOptionGetProc,
    Tk_PathCanvasTagsOptionRestoreProc,
    Tk_PathCanvasTagsOptionFreeProc,
    (ClientData) NULL
};

static Tk_OptionSpec optionSpecs[] = {
    {TK_OPTION_ANCHOR, "-anchor", NULL, NULL,
        "center", -1, offsetof(WindowItem, anchor), 0, 0, 0},
    {TK_OPTION_PIXELS, "-height", NULL, NULL,
        "0", -1, offsetof(WindowItem, height), 0, 0, 0},
    {TK_OPTION_STRING_TABLE, "-state", NULL, NULL,
            PATH_DEF_STATE, -1, offsetof(Tk_PathItem, state),
        0, (ClientData) stateStrings, 0},
    {TK_OPTION_CUSTOM, "-tags", NULL, NULL,
            NULL, -1, offsetof(Tk_PathItem, pathTagsPtr),
        TK_OPTION_NULL_OK, (ClientData) & tagsCO, 0},
    {TK_OPTION_PIXELS, "-width", NULL, NULL,
        "0", -1, offsetof(WindowItem, width), 0, 0, 0},
    {TK_OPTION_WINDOW, "-window", NULL, NULL,
            NULL, -1, offsetof(WindowItem, tkwin),
        TK_OPTION_NULL_OK, 0, 0},
    {TK_OPTION_END, NULL, NULL, NULL,
        NULL, 0, -1, 0, (ClientData) NULL, 0}
};

/*
 * Prototypes for functions defined in this file:
 */

static void ComputeWindowBbox(
    Tk_PathCanvas canvas,
    WindowItem * winItemPtr);
static int ConfigureWinItem(
    Tcl_Interp * interp,
    Tk_PathCanvas canvas,
    Tk_PathItem * itemPtr,
    Tcl_Size objc,
    Tcl_Obj * const objv[],
    int flags);
static int CreateWinItem(
    Tcl_Interp * interp,
    Tk_PathCanvas canvas,
    struct Tk_PathItem *itemPtr,
    Tcl_Size objc,
    Tcl_Obj * const objv[]);
static void DeleteWinItem(
    Tk_PathCanvas canvas,
    Tk_PathItem * itemPtr,
    Display * display);
static void DisplayWinItem(
    Tk_PathCanvas canvas,
    Tk_PathItem * itemPtr,
    Display * display,
    Drawable dst,
    int x,
    int y,
    int width,
    int height);
static void ScaleWinItem(
    Tk_PathCanvas canvas,
    Tk_PathItem * itemPtr,
    int compensate,
    double originX,
    double originY,
    double scaleX,
    double scaleY);
static void TranslateWinItem(
    Tk_PathCanvas canvas,
    Tk_PathItem * itemPtr,
    int compensate,
    double deltaX,
    double deltaY);
static int WinItemCoords(
    Tcl_Interp * interp,
    Tk_PathCanvas canvas,
    Tk_PathItem * itemPtr,
    Tcl_Size objc,
    Tcl_Obj * const objv[]);
static void WinItemLostSlaveProc(
    ClientData clientData,
    Tk_Window tkwin);
static void WinItemRequestProc(
    ClientData clientData,
    Tk_Window tkwin);
static void WinItemStructureProc(
    ClientData clientData,
    XEvent * eventPtr);
static int WinItemToArea(
    Tk_PathCanvas canvas,
    Tk_PathItem * itemPtr,
    double *rectPtr);
static int WinItemToPdf(
    Tcl_Interp * interp,
    Tk_PathCanvas canvas,
    Tk_PathItem * itemPtr,
    Tcl_Size objc,
    Tcl_Obj * const objv[],
    int prepass);
static double WinItemToPoint(
    Tk_PathCanvas canvas,
    Tk_PathItem * itemPtr,
    double *pointPtr);
#ifdef X_GetImage
static int xerrorhandler(
    ClientData clientData,
    XErrorEvent * e);
#endif

/*
 * The structure below defines the window item type by means of functions
 * that can be invoked by generic item code.
 */

Tk_PathItemType tkPathTypeWindow = {
    "window",  /* name */
    sizeof(WindowItem), /* itemSize */
    CreateWinItem,      /* createProc */
    optionSpecs,        /* optionSpecs */
    ConfigureWinItem,   /* configureProc */
    WinItemCoords,      /* coordProc */
    DeleteWinItem,      /* deleteProc */
    DisplayWinItem,     /* displayProc */
    1,         /* flags */
    NULL,      /* bboxProc */
    WinItemToPoint,     /* pointProc */
    WinItemToArea,      /* areaProc */
    WinItemToPdf,       /* pdfProc */
    ScaleWinItem,       /* scaleProc */
    TranslateWinItem,   /* translateProc */
    NULL,      /* indexProc */
    NULL,      /* cursorProc */
    NULL,      /* selectionProc */
    NULL,      /* insertProc */
    NULL,      /* dTextProc */
    NULL,      /* nextPtr */
    0,         /* isPathType */
};

/*
 * The structure below defines the official type record for the canvas (as
 * geometry manager):
 */

static const Tk_GeomMgr canvasGeomType = {
    "canvas",  /* name */
    WinItemRequestProc, /* requestProc */
    WinItemLostSlaveProc,       /* lostSlaveProc */
};

/*
 *--------------------------------------------------------------
 *
 * CreateWinItem --
 *
 *	This function is invoked to create a new window item in a canvas.
 *
 * Results:
 *	A standard Tcl return value. If an error occurred in creating the
 *	item, then an error message is left in the interp's result; in this
 *	case itemPtr is left uninitialized, so it can be safely freed by the
 *	caller.
 *
 * Side effects:
 *	A new window item is created.
 *
 *--------------------------------------------------------------
 */

static int
    CreateWinItem(
    Tcl_Interp * interp,       /* Interpreter for error reporting. */
    Tk_PathCanvas canvas,      /* Canvas to hold new item. */
    Tk_PathItem * itemPtr,     /* Record to hold new item; header has been
                                * initialized by caller. */
    Tcl_Size objc,                  /* Number of arguments in objv. */
    Tcl_Obj * const objv[]) {   /* Arguments describing window. */
    WindowItem *winItemPtr = (WindowItem *) itemPtr;
    int i;
    Tk_OptionTable optionTable;

    if(objc == 0) {
        Tcl_Panic("canvas did not pass any coords\n");
    }

    /*
     * Initialize item's record.
     */

    winItemPtr->tkwin = NULL;
    winItemPtr->width = 0;
    winItemPtr->height = 0;
    winItemPtr->anchor = TK_ANCHOR_CENTER;
    winItemPtr->canvas = canvas;

    optionTable = Tk_CreateOptionTable(interp, optionSpecs);
    itemPtr->optionTable = optionTable;
    if(Tk_InitOptions(interp, (char *)winItemPtr, optionTable,
            Tk_PathCanvasTkwin(canvas)) != TCL_OK) {
        goto error;
    }

    /*
     * Process the arguments to fill in the item record. Only 1 (list) or 2 (x
     * y) coords are allowed.
     */

    if(objc == 1) {
        i = 1;
    } else {
    char *arg = Tcl_GetString(objv[1]);
        i = 2;
        if((arg[0] == '-') && (arg[1] >= 'a') && (arg[1] <= 'z')) {
            i = 1;
        }
    }
    if(WinItemCoords(interp, canvas, itemPtr, i, objv) != TCL_OK) {
        goto error;
    }
    if(ConfigureWinItem(interp, canvas, itemPtr, objc - i, objv + i, 0)
        == TCL_OK) {
        return TCL_OK;
    }

  error:
    DeleteWinItem(canvas, itemPtr, Tk_Display(Tk_PathCanvasTkwin(canvas)));
    return TCL_ERROR;
}

/*
 *--------------------------------------------------------------
 *
 * WinItemCoords --
 *
 *	This function is invoked to process the "coords" widget command on
 *	window items. See the user documentation for details on what it does.
 *
 * Results:
 *	Returns TCL_OK or TCL_ERROR, and sets the interp's result.
 *
 * Side effects:
 *	The coordinates for the given item may be changed.
 *
 *--------------------------------------------------------------
 */

static int
WinItemCoords(
    Tcl_Interp * interp,       /* Used for error reporting. */
    Tk_PathCanvas canvas,      /* Canvas containing item. */
    Tk_PathItem * itemPtr,     /* Item whose coordinates are to be read or
                                * modified. */
    Tcl_Size objc,                  /* Number of coordinates supplied in objv. */
    Tcl_Obj * const objv[])
{              /* Array of coordinates: x1, y1, x2, y2, ... */
    WindowItem *winItemPtr = (WindowItem *) itemPtr;

    if(objc == 0) {
    Tcl_Obj *obj = Tcl_NewObj();
    Tcl_Obj *subobj = Tcl_NewDoubleObj(winItemPtr->x);
        Tcl_ListObjAppendElement(interp, obj, subobj);
        subobj = Tcl_NewDoubleObj(winItemPtr->y);
        Tcl_ListObjAppendElement(interp, obj, subobj);
        Tcl_SetObjResult(interp, obj);
    } else if(objc < 3) {
        if(objc == 1) {
            if(Tcl_ListObjGetElements(interp, objv[0], &objc,
                    (Tcl_Obj ***) & objv) != TCL_OK) {
                return TCL_ERROR;
            } else if(objc != 2) {
    char buf[64 + TCL_INTEGER_SPACE];

                sprintf(buf, "wrong # coordinates: expected 2, got %d", (int)objc);
                Tcl_SetResult(interp, buf, TCL_VOLATILE);
                return TCL_ERROR;
            }
        }
        if((Tk_PathCanvasGetCoordFromObj(interp, canvas, objv[0],
                    &winItemPtr->x)
                != TCL_OK)
            || (Tk_PathCanvasGetCoordFromObj(interp, canvas, objv[1],
                    &winItemPtr->y) != TCL_OK)) {
            return TCL_ERROR;
        }
        ComputeWindowBbox(canvas, winItemPtr);
    } else {
    char buf[64 + TCL_INTEGER_SPACE];

        sprintf(buf, "wrong # coordinates: expected 0 or 2, got %d", (int)objc);
        Tcl_SetResult(interp, buf, TCL_VOLATILE);
        return TCL_ERROR;
    }
    return TCL_OK;
}

/*
 *--------------------------------------------------------------
 *
 * ConfigureWinItem --
 *
 *	This function is invoked to configure various aspects of a window
 *	item, such as its anchor position.
 *
 * Results:
 *	A standard Tcl result code. If an error occurs, then an error message
 *	is left in the interp's result.
 *
 * Side effects:
 *	Configuration information may be set for itemPtr.
 *
 *--------------------------------------------------------------
 */

static int
ConfigureWinItem(
    Tcl_Interp * interp,       /* Used for error reporting. */
    Tk_PathCanvas canvas,      /* Canvas containing itemPtr. */
    Tk_PathItem * itemPtr,     /* Window item to reconfigure. */
    Tcl_Size objc,                  /* Number of elements in objv.  */
    Tcl_Obj * const objv[],    /* Arguments describing things to configure. */
    int flags)
{              /* Flags to pass to Tk_ConfigureWidget. */
    WindowItem *winItemPtr = (WindowItem *) itemPtr;
    Tk_Window oldWindow;
    Tk_Window canvasTkwin;

    oldWindow = winItemPtr->tkwin;
    canvasTkwin = Tk_PathCanvasTkwin(canvas);
    if(TCL_OK != Tk_SetOptions(interp, (char *)winItemPtr,
            itemPtr->optionTable, objc, objv, canvasTkwin, NULL, NULL)) {
        return TCL_ERROR;
    }

    /*
     * A few of the options require additional processing.
     */

    if(oldWindow != winItemPtr->tkwin) {
        if(oldWindow != NULL) {
            Tk_DeleteEventHandler(oldWindow, StructureNotifyMask,
                WinItemStructureProc, (ClientData) winItemPtr);
            Tk_ManageGeometry(oldWindow, NULL, (ClientData) NULL);
            Tk_UnmaintainGeometry(oldWindow, canvasTkwin);
            Tk_UnmapWindow(oldWindow);
        }
        if(winItemPtr->tkwin != NULL) {
    Tk_Window ancestor, parent;

            /*
             * Make sure that the canvas is either the parent of the window
             * associated with the item or a descendant of that parent. Also,
             * don't allow a top-of-hierarchy window to be managed inside a
             * canvas.
             */

            parent = Tk_Parent(winItemPtr->tkwin);
            for(ancestor = canvasTkwin;; ancestor = Tk_Parent(ancestor)) {
                if(ancestor == parent) {
                    break;
                }
                if(((Tk_FakeWin *) (ancestor))->flags & TK_TOP_HIERARCHY) {
                  badWindow:
                    Tcl_AppendResult(interp, "can't use ",
                        Tk_PathName(winItemPtr->tkwin),
                        " in a window item of this canvas", NULL);
                    winItemPtr->tkwin = NULL;
                    return TCL_ERROR;
                }
            }
            if(((Tk_FakeWin *) (winItemPtr->tkwin))->flags & TK_TOP_HIERARCHY) {
                goto badWindow;
            }
            if(winItemPtr->tkwin == canvasTkwin) {
                goto badWindow;
            }
            Tk_CreateEventHandler(winItemPtr->tkwin, StructureNotifyMask,
                WinItemStructureProc, (ClientData) winItemPtr);
            Tk_ManageGeometry(winItemPtr->tkwin, &canvasGeomType,
                (ClientData) winItemPtr);
        }
    }
    if((winItemPtr->tkwin != NULL)
        && (itemPtr->state == TK_PATHSTATE_HIDDEN)) {
        if(canvasTkwin == Tk_Parent(winItemPtr->tkwin)) {
            Tk_UnmapWindow(winItemPtr->tkwin);
        } else {
            Tk_UnmaintainGeometry(winItemPtr->tkwin, canvasTkwin);
        }
    }

    ComputeWindowBbox(canvas, winItemPtr);

    return TCL_OK;
}

/*
 *--------------------------------------------------------------
 *
 * DeleteWinItem --
 *
 *	This function is called to clean up the data structure associated with
 *	a window item.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Resources associated with itemPtr are released.
 *
 *--------------------------------------------------------------
 */

static void
DeleteWinItem(
    Tk_PathCanvas canvas,      /* Overall info about widget. */
    Tk_PathItem * itemPtr,     /* Item that is being deleted. */
    Display * display)
{              /* Display containing window for canvas. */
WindowItem *winItemPtr = (WindowItem *) itemPtr;
Tk_Window canvasTkwin = Tk_PathCanvasTkwin(canvas);

    if(winItemPtr->tkwin != NULL) {
        Tk_DeleteEventHandler(winItemPtr->tkwin, StructureNotifyMask,
            WinItemStructureProc, (ClientData) winItemPtr);
        Tk_ManageGeometry(winItemPtr->tkwin, NULL, (ClientData) NULL);
        if(canvasTkwin != Tk_Parent(winItemPtr->tkwin)) {
            Tk_UnmaintainGeometry(winItemPtr->tkwin, canvasTkwin);
        }
        Tk_UnmapWindow(winItemPtr->tkwin);
    }
    Tk_FreeConfigOptions((char *)itemPtr, itemPtr->optionTable,
        Tk_PathCanvasTkwin(canvas));
}

/*
 *--------------------------------------------------------------
 *
 * ComputeWindowBbox --
 *
 *	This function is invoked to compute the bounding box of all the pixels
 *	that may be drawn as part of a window item. This function is where the
 *	child window's placement is computed.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The fields x1, y1, x2, and y2 are updated in the header for itemPtr.
 *
 *--------------------------------------------------------------
 */

static void
ComputeWindowBbox(
    Tk_PathCanvas canvas,      /* Canvas that contains item. */
    WindowItem * winItemPtr)
{              /* Item whose bbox is to be recomputed. */
int width, height, x, y;
Tk_PathState state = winItemPtr->header.state;

    x = (int)(winItemPtr->x + ((winItemPtr->x >= 0) ? 0.5 : -0.5));
    y = (int)(winItemPtr->y + ((winItemPtr->y >= 0) ? 0.5 : -0.5));

    if(state == TK_PATHSTATE_NULL) {
        state = TkPathCanvasState(canvas);
    }
    if((winItemPtr->tkwin == NULL) || (state == TK_PATHSTATE_HIDDEN)) {
        /*
         * There is no window for this item yet. Just give it a 1x1 bounding
         * box. Don't give it a 0x0 bounding box; there are strange cases
         * where this bounding box might be used as the dimensions of the
         * window, and 0x0 causes problems under X.
         */

        winItemPtr->header.x1 = x;
        winItemPtr->header.x2 = winItemPtr->header.x1 + 1;
        winItemPtr->header.y1 = y;
        winItemPtr->header.y2 = winItemPtr->header.y1 + 1;
        return;
    }

    /*
     * Compute dimensions of window.
     */

    width = winItemPtr->width;
    if(width <= 0) {
        width = Tk_ReqWidth(winItemPtr->tkwin);
        if(width <= 0) {
            width = 1;
        }
    }
    height = winItemPtr->height;
    if(height <= 0) {
        height = Tk_ReqHeight(winItemPtr->tkwin);
        if(height <= 0) {
            height = 1;
        }
    }

    /*
     * Compute location of window, using anchor information.
     */

    switch (winItemPtr->anchor) {
    case TK_ANCHOR_N:
        x -= width / 2;
        break;
    case TK_ANCHOR_NE:
        x -= width;
        break;
    case TK_ANCHOR_E:
        x -= width;
        y -= height / 2;
        break;
    case TK_ANCHOR_SE:
        x -= width;
        y -= height;
        break;
    case TK_ANCHOR_S:
        x -= width / 2;
        y -= height;
        break;
    case TK_ANCHOR_SW:
        y -= height;
        break;
    case TK_ANCHOR_W:
        y -= height / 2;
        break;
    case TK_ANCHOR_NW:
        break;
    case TK_ANCHOR_CENTER:
        x -= width / 2;
        y -= height / 2;
        break;
    }

    /*
     * Store the information in the item header.
     */

    winItemPtr->header.x1 = x;
    winItemPtr->header.y1 = y;
    winItemPtr->header.x2 = x + width;
    winItemPtr->header.y2 = y + height;
}

/*
 *--------------------------------------------------------------
 *
 * DisplayWinItem --
 *
 *	This function is invoked to "draw" a window item in a given drawable.
 *	Since the window draws itself, we needn't do any actual redisplay
 *	here. However, this function takes care of actually repositioning the
 *	child window so that it occupies the correct screen position.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The child window's position may get changed. Note: this function gets
 *	called both when a window needs to be displayed and when it ceases to
 *	be visible on the screen (e.g. it was scrolled or moved off-screen or
 *	the enclosing canvas is unmapped).
 *
 *--------------------------------------------------------------
 */

static void
DisplayWinItem(
    Tk_PathCanvas canvas,      /* Canvas that contains item. */
    Tk_PathItem * itemPtr,     /* Item to be displayed. */
    Display * display,         /* Display on which to draw item. */
    Drawable drawable,         /* Pixmap or window in which to draw item. */
    int regionX,
    int regionY,
    int regionWidth,
    int regionHeight)
                                /* Describes region of canvas that must be
                                 * redisplayed (not used). */
{
    WindowItem *winItemPtr = (WindowItem *) itemPtr;
    int width, height;
    short x, y;
    Tk_Window canvasTkwin = Tk_PathCanvasTkwin(canvas);
    Tk_PathState state = itemPtr->state;

    if(winItemPtr->tkwin == NULL) {
        return;
    }
    if(state == TK_PATHSTATE_NULL) {
        state = TkPathCanvasState(canvas);
    }

    /*
     * A drawable of None is used by the canvas UnmapNotify handler
     * to indicate that we should no longer display ourselves.
     */
    if(state == TK_PATHSTATE_HIDDEN || drawable == None) {
        if(canvasTkwin == Tk_Parent(winItemPtr->tkwin)) {
            Tk_UnmapWindow(winItemPtr->tkwin);
        } else {
            Tk_UnmaintainGeometry(winItemPtr->tkwin, canvasTkwin);
        }
        return;
    }
    Tk_PathCanvasWindowCoords(canvas, (double)winItemPtr->header.x1,
        (double)winItemPtr->header.y1, &x, &y);
    width = winItemPtr->header.x2 - winItemPtr->header.x1;
    height = winItemPtr->header.y2 - winItemPtr->header.y1;

    /*
     * If the window is completely out of the visible area of the canvas then
     * unmap it. This code used not to be present (why unmap the window if it
     * isn't visible anyway?) but this could cause the window to suddenly
     * reappear if the canvas window got resized.
     */

    if(((x + width) <= 0) || ((y + height) <= 0)
        || (x >= Tk_Width(canvasTkwin)) || (y >= Tk_Height(canvasTkwin))) {
        if(canvasTkwin == Tk_Parent(winItemPtr->tkwin)) {
            Tk_UnmapWindow(winItemPtr->tkwin);
        } else {
            Tk_UnmaintainGeometry(winItemPtr->tkwin, canvasTkwin);
        }
        return;
    }

    /*
     * Reposition and map the window (but in different ways depending on
     * whether the canvas is the window's parent).
     */

    if(canvasTkwin == Tk_Parent(winItemPtr->tkwin)) {
        if((x != Tk_X(winItemPtr->tkwin)) || (y != Tk_Y(winItemPtr->tkwin))
            || (width != Tk_Width(winItemPtr->tkwin))
            || (height != Tk_Height(winItemPtr->tkwin))) {
            Tk_MoveResizeWindow(winItemPtr->tkwin, x, y, width, height);
        }
        Tk_MapWindow(winItemPtr->tkwin);
    } else {
        Tk_MaintainGeometry(winItemPtr->tkwin, canvasTkwin, x, y,
            width, height);
    }
}

/*
 *--------------------------------------------------------------
 *
 * WinItemToPoint --
 *
 *	Computes the distance from a given point to a given window, in canvas
 *	units.
 *
 * Results:
 *	The return value is 0 if the point whose x and y coordinates are
 *	coordPtr[0] and coordPtr[1] is inside the window. If the point isn't
 *	inside the window then the return value is the distance from the point
 *	to the window.
 *
 * Side effects:
 *	None.
 *
 *--------------------------------------------------------------
 */

static double
WinItemToPoint(
    Tk_PathCanvas canvas,      /* Canvas containing item. */
    Tk_PathItem * itemPtr,     /* Item to check against point. */
    double *pointPtr)
{              /* Pointer to x and y coordinates. */
    WindowItem *winItemPtr = (WindowItem *) itemPtr;
    double x1, x2, y1, y2, xDiff, yDiff;

    x1 = winItemPtr->header.x1;
    y1 = winItemPtr->header.y1;
    x2 = winItemPtr->header.x2;
    y2 = winItemPtr->header.y2;

    /*
     * Point is outside window.
     */

    if(pointPtr[0] < x1) {
        xDiff = x1 - pointPtr[0];
    } else if(pointPtr[0] >= x2) {
        xDiff = pointPtr[0] + 1 - x2;
    } else {
        xDiff = 0;
    }

    if(pointPtr[1] < y1) {
        yDiff = y1 - pointPtr[1];
    } else if(pointPtr[1] >= y2) {
        yDiff = pointPtr[1] + 1 - y2;
    } else {
        yDiff = 0;
    }

    return hypot(xDiff, yDiff);
}

/*
 *--------------------------------------------------------------
 *
 * WinItemToArea --
 *
 *	This function is called to determine whether an item lies entirely
 *	inside, entirely outside, or overlapping a given rectangle.
 *
 * Results:
 *	-1 is returned if the item is entirely outside the area given by
 *	rectPtr, 0 if it overlaps, and 1 if it is entirely inside the given
 *	area.
 *
 * Side effects:
 *	None.
 *
 *--------------------------------------------------------------
 */

static int
WinItemToArea(
    Tk_PathCanvas canvas,      /* Canvas containing item. */
    Tk_PathItem * itemPtr,     /* Item to check against rectangle. */
    double *rectPtr)
{              /* Pointer to array of four coordinates
                * (x1,y1,x2,y2) describing rectangular
                * area.  */
    WindowItem *winItemPtr = (WindowItem *) itemPtr;

    if((rectPtr[2] <= winItemPtr->header.x1)
        || (rectPtr[0] >= winItemPtr->header.x2)
        || (rectPtr[3] <= winItemPtr->header.y1)
        || (rectPtr[1] >= winItemPtr->header.y2)) {
        return -1;
    }
    if((rectPtr[0] <= winItemPtr->header.x1)
        && (rectPtr[1] <= winItemPtr->header.y1)
        && (rectPtr[2] >= winItemPtr->header.x2)
        && (rectPtr[3] >= winItemPtr->header.y2)) {
        return 1;
    }
    return 0;
}

/*
 *--------------------------------------------------------------
 *
 * xerrorhandler --
 *
 *	This is a dummy function to catch X11 errors during an attempt to
 *	print a canvas window.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	None.
 *
 *--------------------------------------------------------------
 */

#ifdef X_GetImage
static int
xerrorhandler(
    ClientData clientData,
    XErrorEvent * e)
{
    return 0;
}
#endif

/*
 *--------------------------------------------------------------
 *
 * WinItemToPdf --
 *
 *	This function is called to generate Pdf for window items.
 *
 * Results:
 *	The return value is a standard Tcl result. If an error occurs in
 *	generating Pdf then an error message is left in interp->result,
 *	replacing whatever used to be there. If no error occurs, then
 *	Pdf for the item is appended to the result.
 *
 * Side effects:
 *	None.
 *
 *--------------------------------------------------------------
 */

static int
WinItemToPdf(
    Tcl_Interp * interp,       /* Leave Pdf or error message here. */
    Tk_PathCanvas canvas,      /* Information about overall canvas. */
    Tk_PathItem * itemPtr,     /* Item for which Pdf is wanted. */
    Tcl_Size objc,                  /* Number of arguments. */
    Tcl_Obj * const objv[],    /* Argument list. */
    int prepass)
{              /* 1 means this is a prepass to collect font
                * information; 0 means final Pdf is
                * being created. */
    return TCL_OK;
}

/*
 *--------------------------------------------------------------
 *
 * ScaleWinItem --
 *
 *	This function is invoked to rescale a window item.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The window referred to by itemPtr is rescaled so that the following
 *	transformation is applied to all point coordinates:
 *		x' = originX + scaleX*(x-originX)
 *		y' = originY + scaleY*(y-originY)
 *
 *--------------------------------------------------------------
 */

static void
ScaleWinItem(
    Tk_PathCanvas canvas,      /* Canvas containing window. */
    Tk_PathItem * itemPtr,     /* Window to be scaled. */
    int compensate,            /* Unused. */
    double originX,
    double originY,
    /* Origin about which to scale window. */
    double scaleX,             /* Amount to scale in X direction. */
    double scaleY)
{              /* Amount to scale in Y direction. */
    WindowItem *winItemPtr = (WindowItem *) itemPtr;

    winItemPtr->x = originX + scaleX * (winItemPtr->x - originX);
    winItemPtr->y = originY + scaleY * (winItemPtr->y - originY);
    if(winItemPtr->width > 0) {
        winItemPtr->width = (int)(scaleX * winItemPtr->width);
    }
    if(winItemPtr->height > 0) {
        winItemPtr->height = (int)(scaleY * winItemPtr->height);
    }
    ComputeWindowBbox(canvas, winItemPtr);
}

/*
 *--------------------------------------------------------------
 *
 * TranslateWinItem --
 *
 *	This function is called to move a window by a given amount.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The position of the window is offset by (xDelta, yDelta), and the
 *	bounding box is updated in the generic part of the item structure.
 *
 *--------------------------------------------------------------
 */

static void
TranslateWinItem(
    Tk_PathCanvas canvas,      /* Canvas containing item. */
    Tk_PathItem * itemPtr,     /* Item that is being moved. */
    int compensate,            /* Unused. */
    double deltaX,
    double deltaY)
                                /* Amount by which item is to be moved. */
{
    WindowItem *winItemPtr = (WindowItem *) itemPtr;

    winItemPtr->x += deltaX;
    winItemPtr->y += deltaY;
    ComputeWindowBbox(canvas, winItemPtr);
}

/*
 *--------------------------------------------------------------
 *
 * WinItemStructureProc --
 *
 *	This function is invoked whenever StructureNotify events occur for a
 *	window that's managed as part of a canvas window item. This function's
 *	only purpose is to clean up when windows are deleted.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The window is disassociated from the window item when it is deleted.
 *
 *--------------------------------------------------------------
 */

static void
WinItemStructureProc(
    ClientData clientData,     /* Pointer to record describing window item. */
    XEvent * eventPtr)
{              /* Describes what just happened. */
WindowItem *winItemPtr = (WindowItem *) clientData;

    if(eventPtr->type == DestroyNotify) {
        winItemPtr->tkwin = NULL;
    }
}

/*
 *--------------------------------------------------------------
 *
 * WinItemRequestProc --
 *
 *	This function is invoked whenever a window that's associated with a
 *	window canvas item changes its requested dimensions.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The size and location on the screen of the window may change,
 *	depending on the options specified for the window item.
 *
 *--------------------------------------------------------------
 */

static void
WinItemRequestProc(
    ClientData clientData,     /* Pointer to record for window item. */
    Tk_Window tkwin)
{              /* Window that changed its desired size. */
WindowItem *winItemPtr = (WindowItem *) clientData;

    ComputeWindowBbox(winItemPtr->canvas, winItemPtr);

    /*
     * A drawable argument of None to DisplayWinItem is used by the canvas
     * UnmapNotify handler to indicate that we should no longer display
     * ourselves, so need to pass a (bogus) non-zero drawable value here.
     */
    DisplayWinItem(winItemPtr->canvas, (Tk_PathItem *) winItemPtr, NULL,
        (Drawable) - 1, 0, 0, 0, 0);
}

/*
 *--------------------------------------------------------------
 *
 * WinItemLostSlaveProc --
 *
 *	This function is invoked by Tk whenever some other geometry claims
 *	control over a slave that used to be managed by us.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Forgets all canvas-related information about the slave.
 *
 *--------------------------------------------------------------
 */

        /* ARGSUSED */
static void
WinItemLostSlaveProc(
    ClientData clientData,     /* WindowItem structure for slave window that
                                * was stolen away. */
    Tk_Window tkwin)
{              /* Tk's handle for the slave window. */
WindowItem *winItemPtr = (WindowItem *) clientData;
Tk_Window canvasTkwin = Tk_PathCanvasTkwin(winItemPtr->canvas);

    Tk_DeleteEventHandler(winItemPtr->tkwin, StructureNotifyMask,
        WinItemStructureProc, (ClientData) winItemPtr);
    if(canvasTkwin != Tk_Parent(winItemPtr->tkwin)) {
        Tk_UnmaintainGeometry(winItemPtr->tkwin, canvasTkwin);
    }
    Tk_UnmapWindow(winItemPtr->tkwin);
    winItemPtr->tkwin = NULL;
}

/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */
