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/*

 * tixDiStyle.c --

 *

 *      This file implements the "Display Item Styles" in the Tix library.

 *

 * Copyright (c) 1996, Expert Interface Technologies

 *

 * See the file "license.terms" for information on usage and redistribution

 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.

 *

 *

 */

#include <tixPort.h>

#include <tixInt.h>

typedef struct StyleLink {

    Tix_DItemInfo * diTypePtr;

    Tix_DItemStyle* stylePtr;

    struct StyleLink * next;

} StyleLink;

typedef struct StyleInfo {

    Tix_StyleTemplate * tmplPtr;

    Tix_StyleTemplate tmpl;

    StyleLink * linkHead;

} StyleInfo;

static int              DItemStyleParseProc _ANSI_ARGS_((ClientData clientData,

                            Tcl_Interp *interp, Tk_Window tkwin,

                            char *value,char *widRec, int offset));

static char *           DItemStylePrintProc _ANSI_ARGS_((

                            ClientData clientData, Tk_Window tkwin,

                            char *widRec, int offset,

                            Tcl_FreeProc **freeProcPtr));

static Tix_DItemStyle*  FindDefaultStyle _ANSI_ARGS_((

                            Tix_DItemInfo * diTypePtr, Tk_Window tkwin));

static Tix_DItemStyle*  FindStyle _ANSI_ARGS_((

                            char *styleName));

static Tix_DItemStyle*  GetDItemStyle  _ANSI_ARGS_((

                            Tix_DispData * ddPtr, Tix_DItemInfo * diTypePtr,

                            char * styleName, int *isNew_ret));

static void             InitHashTables _ANSI_ARGS_((void));

static void             ListAdd _ANSI_ARGS_((Tix_DItemStyle * stylePtr,

                            Tix_DItem *iPtr));

static void             ListDelete _ANSI_ARGS_((Tix_DItemStyle * stylePtr,

                            Tix_DItem *iPtr));

static void             ListDeleteAll _ANSI_ARGS_((Tix_DItemStyle * stylePtr));

static void             StyleCmdDeletedProc _ANSI_ARGS_((

                            ClientData clientData));

static int              StyleCmd _ANSI_ARGS_((ClientData clientData,

                            Tcl_Interp *interp, int argc, char **argv));

static int              StyleConfigure _ANSI_ARGS_((Tcl_Interp *interp,

                            Tix_DItemStyle* stylePtr, int argc,

                            char **argv, int flags));

static void             StyleDestroy _ANSI_ARGS_((ClientData clientData));

static void             DeleteStyle _ANSI_ARGS_((Tix_DItemStyle * stylePtr));

static void             DefWindowStructureProc _ANSI_ARGS_((

                            ClientData clientData, XEvent *eventPtr));

static void             RefWindowStructureProc _ANSI_ARGS_((

                            ClientData clientData, XEvent *eventPtr));

static void             SetDefaultStyle _ANSI_ARGS_((Tix_DItemInfo *diTypePtr,

                            Tk_Window tkwin, Tix_DItemStyle * stylePtr));

static TIX_DECLARE_SUBCMD(StyleConfigCmd);

static TIX_DECLARE_SUBCMD(StyleCGetCmd);

static TIX_DECLARE_SUBCMD(StyleDeleteCmd);

static Tcl_HashTable styleTable;

static Tcl_HashTable defaultTable;

static int tableInited = 0;

/*

 *--------------------------------------------------------------

 *

 * TixDItemStyleFree --

 *

 *      When an item does not need a style anymore (when the item

 *      is destroyed, e.g.), it must call this procedute to free the

 *      style).

 *

 * Results:

 *      Nothing

 *

 * Side effects:

 *      The item is freed from the list of attached items in the style.

 *      Also, the style will be freed if it was already destroyed and

 *      it has no more items attached to it.

 *

 *--------------------------------------------------------------

 */

void TixDItemStyleFree(iPtr, stylePtr)

    Tix_DItem *iPtr;

    Tix_DItemStyle * stylePtr;

{

    ListDelete(stylePtr, iPtr);

}

/*

 *--------------------------------------------------------------

 *

 * Tix_ItemStyleCmd --

 *

 *      This procedure is invoked to process the "tixItemStyle" Tcl

 *      command.

 *

 * Results:

 *      A standard Tcl result.

 *

 * Side effects:

 *      A new widget is created and configured.

 *

 *--------------------------------------------------------------

 */

int

Tix_ItemStyleCmd(clientData, interp, argc, argv)

    ClientData clientData;

    Tcl_Interp *interp;         /* Current interpreter. */

    int argc;                   /* Number of arguments. */

    char **argv;                /* Argument strings. */

{

    Tix_DItemInfo * diTypePtr;

    Tk_Window tkwin = (Tk_Window)clientData;

    char * styleName = NULL;

    Tix_DispData dispData;

    char buff[100];

    int i, n;

    static int counter = 0;

    Tix_DItemStyle * stylePtr;

    if (tableInited == 0) {

        InitHashTables();

    }

    if (argc < 2) {

        return Tix_ArgcError(interp, argc, argv, 1,

            "itemtype ?option value ...");

    }

    if ((diTypePtr=Tix_GetDItemType(interp, argv[1])) == NULL) {

        return TCL_ERROR;

    }

    /*

     * Parse the -refwindow option: this tells the style to use this

     * window to query the default values for background, foreground

     * etc. Usually, you should set the -refwindow to the window that

     * holds the display items which are controlled by this style.

     */

    if (argc > 2) {

        size_t len;

        if (argc %2 != 0) {

            Tcl_AppendResult(interp, "value for \"", argv[argc-1],

                "\" missing", NULL);

            return TCL_ERROR;

        }

        for (n=i=2; i<argc; i+=2) {

            len = strlen(argv[i]);

            if (strncmp(argv[i], "-refwindow", len) == 0) {

                if ((tkwin=Tk_NameToWindow(interp,argv[i+1],tkwin)) == NULL) {

                    return TCL_ERROR;

                }

                continue;

            }

            if (strncmp(argv[i], "-stylename", len) == 0) {

                styleName = argv[i+1];

                if (FindStyle(styleName) != NULL) {

                    Tcl_AppendResult(interp, "style \"", argv[i+1],

                        "\" already exist", NULL);

                    return TCL_ERROR;

                }

                continue;

            }

            if (n!=i) {

                argv[n]   = argv[i];

                argv[n+1] = argv[i+1];

            }

            n+=2;

        }

        argc = n;

    }

    if (styleName == NULL) {

        /*

         * No name is given, we'll make a unique name by default

         * (ToDo: check if the name has already been used)

         */

        sprintf(buff, "tixStyle%d", counter++);

        styleName = buff;

    }

    dispData.interp  = interp;

    dispData.display = Tk_Display(tkwin);

    dispData.tkwin   = tkwin;

    if ((stylePtr = GetDItemStyle(&dispData, diTypePtr,

         styleName, NULL)) == NULL) {

        return TCL_ERROR;

    }

    if (StyleConfigure(interp, stylePtr, argc-2, argv+2, 0) != TCL_OK) {

        DeleteStyle(stylePtr);

        return TCL_ERROR;

    }

    Tk_CreateEventHandler(tkwin, StructureNotifyMask,

            RefWindowStructureProc, (ClientData)stylePtr);

    Tcl_ResetResult(interp);

    Tcl_AppendResult(interp, styleName, NULL);

    return TCL_OK;

}

static int

StyleCmd(clientData, interp, argc, argv)

    ClientData clientData;

    Tcl_Interp *interp;

    int argc;

    char **argv;

{

    int code;

    static Tix_SubCmdInfo subCmdInfo[] = {

        {TIX_DEFAULT_LEN, "cget", 1, 1, StyleCGetCmd,

           "option"},

        {TIX_DEFAULT_LEN, "configure", 0, TIX_VAR_ARGS, StyleConfigCmd,

           "?option? ?value? ?option value ... ?"},

        {TIX_DEFAULT_LEN, "delete", 0, 0, StyleDeleteCmd,

           ""},

    };

    static Tix_CmdInfo cmdInfo = {

        Tix_ArraySize(subCmdInfo), 1, TIX_VAR_ARGS, "?option? arg ?arg ...?",

    };

    Tk_Preserve(clientData);

    code = Tix_HandleSubCmds(&cmdInfo, subCmdInfo, clientData,

        interp, argc, argv);

    Tk_Release(clientData);

    return code;

}

/*----------------------------------------------------------------------

 * "cget" sub command

 *----------------------------------------------------------------------

 */

static int

StyleCGetCmd(clientData, interp, argc, argv)

    ClientData clientData;

    Tcl_Interp *interp;         /* Current interpreter. */

    int argc;                   /* Number of arguments. */

    char **argv;                /* Argument strings. */

{

    Tix_DItemStyle* stylePtr= (Tix_DItemStyle*) clientData;

    return Tk_ConfigureValue(interp, stylePtr->base.tkwin,

        stylePtr->base.diTypePtr->styleConfigSpecs,

        (char *)stylePtr, argv[0], 0);

}

/*----------------------------------------------------------------------

 * "configure" sub command

 *----------------------------------------------------------------------

 */

static int

StyleConfigCmd(clientData, interp, argc, argv)

    ClientData clientData;

    Tcl_Interp *interp;         /* Current interpreter. */

    int argc;                   /* Number of arguments. */

    char **argv;                /* Argument strings. */

{

    Tix_DItemStyle* stylePtr= (Tix_DItemStyle*) clientData;

    if (argc == 0) {

        return Tk_ConfigureInfo(interp, stylePtr->base.tkwin,

            stylePtr->base.diTypePtr->styleConfigSpecs,

            (char *)stylePtr, (char *) NULL, 0);

    } else if (argc == 1) {

        return Tk_ConfigureInfo(interp, stylePtr->base.tkwin,

            stylePtr->base.diTypePtr->styleConfigSpecs,

            (char *)stylePtr, argv[0], 0);

    } else {

        return StyleConfigure(interp, stylePtr, argc, argv,

            TK_CONFIG_ARGV_ONLY);

    }

}

/*----------------------------------------------------------------------

 * "delete" sub command

 *----------------------------------------------------------------------

 */

static int

StyleDeleteCmd(clientData, interp, argc, argv)

    ClientData clientData;

    Tcl_Interp *interp;         /* Current interpreter. */

    int argc;                   /* Number of arguments. */

    char **argv;                /* Argument strings. */

{

    Tix_DItemStyle* stylePtr= (Tix_DItemStyle*) clientData;

    if (stylePtr->base.flags & TIX_STYLE_DEFAULT) {

        Tcl_AppendResult(interp, "Cannot delete default item style",

            NULL);

        return TCL_ERROR;

    }

    DeleteStyle(stylePtr);

    return TCL_OK;

}

static int

StyleConfigure(interp, stylePtr, argc, argv, flags)

    Tcl_Interp *interp;         /* Used for error reporting. */

    Tix_DItemStyle* stylePtr;   /* Information about the style;  may or may

                                 * not already have values for some fields. */

    int argc;                   /* Number of valid entries in argv. */

    char **argv;                /* Arguments. */

    int flags;                  /* Flags to pass to Tk_ConfigureWidget. */

{

    Tix_DItemInfo * diTypePtr = stylePtr->base.diTypePtr;

    if (diTypePtr->styleConfigureProc(stylePtr, argc, argv, flags) != TCL_OK) {

        return TCL_ERROR;

    }

    return TCL_OK;

}

/*----------------------------------------------------------------------

 * StyleDestroy --

 *

 *      Destroy a display style.

 *----------------------------------------------------------------------

 */

static void

StyleDestroy(clientData)

    ClientData clientData;

{

    Tix_DItemStyle* stylePtr= (Tix_DItemStyle*) clientData;

    if ((stylePtr->base.flags & TIX_STYLE_DEFAULT)) {

        /*

         * If this is the default style for the display items, we

         * can't tell the display items that it has lost its style,

         * otherwise the ditem will just attempt to create the default

         * style again, and we will go into an infinite loop

         */

        if (stylePtr->base.refCount != 0) {

            /*

             * If the refcount is not zero, this style will NOT be

             * destroyed.  The real destroy will be triggered if all

             * DItems associated with this style is destroyed (in the

             * ListDelete() function).

             *

             * If a widget is destroyed, it is the responsibility of the

             * widget writer to delete all DItems associated with this

             * widget. We can discover memory leak if the widget is

             * destroyed but some default styles associated with it still

             * exist

             */

            return;

        }

    } else {

        stylePtr->base.refCount = 0;

    }

    Tcl_DeleteHashTable(&stylePtr->base.items);

    ckfree((char*)stylePtr->base.name);

    stylePtr->base.diTypePtr->styleFreeProc(stylePtr);

}

static void

StyleCmdDeletedProc(clientData)

    ClientData clientData;

{

    Tix_DItemStyle * stylePtr = (Tix_DItemStyle *)clientData;

    stylePtr->base.styleCmd = NULL;

    if (stylePtr->base.flags & TIX_STYLE_DEFAULT) {

        /*

         * Don't do anything

         * ToDo: maybe should give a background warning:

         */

    } else {

        DeleteStyle(stylePtr);

    }

}

static void

DeleteStyle(stylePtr)

    Tix_DItemStyle * stylePtr;

{

    Tcl_HashEntry * hashPtr;

    if (!(stylePtr->base.flags & TIX_STYLE_DELETED)) {

        stylePtr->base.flags |= TIX_STYLE_DELETED;

        if (stylePtr->base.styleCmd != NULL) {

            Tcl_DeleteCommand(stylePtr->base.interp,

                Tcl_GetCommandName(stylePtr->base.interp,

                stylePtr->base.styleCmd));

        }

        hashPtr=Tcl_FindHashEntry(&styleTable, stylePtr->base.name);

        if (hashPtr != NULL) {

            Tcl_DeleteHashEntry(hashPtr);

        }

        ListDeleteAll(stylePtr);

        Tk_EventuallyFree((ClientData)stylePtr, (Tix_FreeProc *)StyleDestroy);

    }

}

/*

 *----------------------------------------------------------------------

 * FindDefaultStyle --

 *

 *      Return the default style of the given type of ditem for the

 *      given tkwin, if such a default style exists.

 *

 * Results:

 *      Pointer to the default style or NULL.

 *

 * Side effects:

 *      None.

 *----------------------------------------------------------------------

 */

static Tix_DItemStyle*

FindDefaultStyle(diTypePtr, tkwin)

    Tix_DItemInfo * diTypePtr;

    Tk_Window tkwin;

{

    Tcl_HashEntry *hashPtr;

    StyleInfo * infoPtr;

    StyleLink * linkPtr;

    if (tableInited == 0) {

        InitHashTables();

    }

    if ((hashPtr=Tcl_FindHashEntry(&defaultTable, (char*)tkwin)) == NULL) {

        return NULL;

    }

    infoPtr = (StyleInfo *)Tcl_GetHashValue(hashPtr);

    for (linkPtr = infoPtr->linkHead; linkPtr; linkPtr=linkPtr->next) {

        if (linkPtr->diTypePtr == diTypePtr) {

            return linkPtr->stylePtr;

        }

    }

    return NULL;

}

static void SetDefaultStyle(diTypePtr, tkwin, stylePtr)

    Tix_DItemInfo * diTypePtr;

    Tk_Window tkwin;

    Tix_DItemStyle * stylePtr;

{

    Tcl_HashEntry *hashPtr;

    StyleInfo * infoPtr;

    StyleLink * newPtr;

    int isNew;

    if (tableInited == 0) {

        InitHashTables();

    }

    newPtr = (StyleLink *)ckalloc(sizeof(StyleLink));

    newPtr->diTypePtr = diTypePtr;

    newPtr->stylePtr  = stylePtr;

    hashPtr = Tcl_CreateHashEntry(&defaultTable, (char*)tkwin, &isNew);

    if (!isNew) {

        infoPtr = (StyleInfo *)Tcl_GetHashValue(hashPtr);

        if (infoPtr->tmplPtr) {

            if (diTypePtr->styleSetTemplateProc != NULL) {

                diTypePtr->styleSetTemplateProc(stylePtr,

                    infoPtr->tmplPtr);

            }

        }

    } else {

        infoPtr = (StyleInfo *)ckalloc(sizeof(StyleInfo));

        infoPtr->linkHead = NULL;

        infoPtr->tmplPtr  = NULL;

        Tk_CreateEventHandler(tkwin, StructureNotifyMask,

            DefWindowStructureProc, (ClientData)tkwin);

        Tcl_SetHashValue(hashPtr, (char*)infoPtr);

    }

    newPtr->next = infoPtr->linkHead;

    infoPtr->linkHead = newPtr;

}

/*

 *----------------------------------------------------------------------

 * TixGetDefaultDItemStyle --

 *

 *      Gets the default style for an item if the application doesn't

 *      explicitly give it an style with the -style switch.

 *

 * Results:

 *      The default style.

 *

 * Side effects:

 *

 *----------------------------------------------------------------------

 */

Tix_DItemStyle*

TixGetDefaultDItemStyle(ddPtr, diTypePtr, iPtr, oldStylePtr)

    Tix_DispData * ddPtr;               /* Info about the display. */

    Tix_DItemInfo * diTypePtr;          /* Info about the DItem type. */

    Tix_DItem *iPtr;                    /* Get default style for this DItem. */

    Tix_DItemStyle* oldStylePtr;        /* ?? */

{

    Tcl_DString dString;

    Tix_DItemStyle* stylePtr;

    int isNew;

    if (tableInited  == 0) {

        InitHashTables();

    }

    stylePtr = FindDefaultStyle(diTypePtr, ddPtr->tkwin);

    if (stylePtr == NULL) {

        /*

         * Format default name for this style+window

         */

        Tcl_DStringInit(&dString);

        Tcl_DStringAppend(&dString, "style", 5);

        Tcl_DStringAppend(&dString, Tk_PathName(ddPtr->tkwin),

            strlen(Tk_PathName(ddPtr->tkwin)));

        Tcl_DStringAppend(&dString, ":", 1);

        Tcl_DStringAppend(&dString, diTypePtr->name, strlen(diTypePtr->name));

        /*

         * Create the new style

         */

        stylePtr = GetDItemStyle(ddPtr, diTypePtr, dString.string, &isNew);

        if (isNew) {

            diTypePtr->styleConfigureProc(stylePtr, 0, NULL, 0);

            stylePtr->base.flags |= TIX_STYLE_DEFAULT;

        }

        SetDefaultStyle(diTypePtr, ddPtr->tkwin, stylePtr);

        Tcl_DStringFree(&dString);

    }

    if (oldStylePtr) {

        ListDelete(oldStylePtr, iPtr);

    }

    ListAdd(stylePtr, iPtr);

    return stylePtr;

}

void Tix_SetDefaultStyleTemplate(tkwin, tmplPtr)

    Tk_Window tkwin;

    Tix_StyleTemplate * tmplPtr;

{

    Tcl_HashEntry * hashPtr;

    StyleInfo * infoPtr;

    StyleLink * linkPtr;

    int isNew;

    if (tableInited == 0) {

        InitHashTables();

    }

    hashPtr=Tcl_CreateHashEntry(&defaultTable, (char*)tkwin, &isNew);

    if (!isNew) {

        infoPtr = (StyleInfo *)Tcl_GetHashValue(hashPtr);

        infoPtr->tmplPtr = &infoPtr->tmpl;

        infoPtr->tmpl = *tmplPtr;

        for (linkPtr = infoPtr->linkHead; linkPtr; linkPtr=linkPtr->next) {

            if (linkPtr->diTypePtr->styleSetTemplateProc != NULL) {

                linkPtr->diTypePtr->styleSetTemplateProc(linkPtr->stylePtr,

                    tmplPtr);

            }

        }

    } else {

        infoPtr = (StyleInfo *)ckalloc(sizeof(StyleInfo));

        infoPtr->linkHead = NULL;

        infoPtr->tmplPtr = &infoPtr->tmpl;

        infoPtr->tmpl = *tmplPtr;

        Tk_CreateEventHandler(tkwin, StructureNotifyMask,

            DefWindowStructureProc, (ClientData)tkwin);

        Tcl_SetHashValue(hashPtr, (char*)infoPtr);

    }

}

/*

 *----------------------------------------------------------------------

 * GetDItemStyle --

 *

 *      Returns an ItemStyle with the given name.

 *

 * Results:

 *      Pointer to the given Tix_DItsmStyle.

 *

 * Side effects:

 *      If the style doesn't already exist, it is allocated.

 *----------------------------------------------------------------------

 */

static Tix_DItemStyle*

GetDItemStyle(ddPtr, diTypePtr, styleName, isNew_ret)

    Tix_DispData * ddPtr;

    Tix_DItemInfo * diTypePtr;

    char * styleName;

    int * isNew_ret;

{

    Tcl_HashEntry *hashPtr;

    int isNew;

    Tix_DItemStyle * stylePtr;

    if (tableInited == 0) {

        InitHashTables();

    }

    hashPtr = Tcl_CreateHashEntry(&styleTable, styleName, &isNew);

    if (!isNew) {

        stylePtr = (Tix_DItemStyle *)Tcl_GetHashValue(hashPtr);

    }

    else {

        stylePtr = diTypePtr->styleCreateProc(ddPtr->interp,

            ddPtr->tkwin, diTypePtr, styleName);

        stylePtr->base.styleCmd = Tcl_CreateCommand(ddPtr->interp,

            styleName, StyleCmd, (ClientData)stylePtr, StyleCmdDeletedProc);

        stylePtr->base.interp    = ddPtr->interp;

        stylePtr->base.tkwin     = ddPtr->tkwin;

        stylePtr->base.diTypePtr = diTypePtr;

        stylePtr->base.name      = (char*)tixStrDup(styleName);

        stylePtr->base.pad[0]     = 0;

        stylePtr->base.pad[1]    = 0;

        stylePtr->base.anchor    = TK_ANCHOR_CENTER;

        stylePtr->base.refCount  = 0;

        stylePtr->base.flags     = 0;

        Tcl_InitHashTable(&stylePtr->base.items, TCL_ONE_WORD_KEYS);

        Tcl_SetHashValue(hashPtr, (char*)stylePtr);

    }

    if (isNew_ret != NULL) {

        * isNew_ret = isNew;

    }

    return stylePtr;

}

static Tix_DItemStyle* FindStyle(styleName)

    char *styleName;

{

    Tcl_HashEntry *hashPtr;

    if (tableInited == 0) {

        InitHashTables();

    }

    if ((hashPtr=Tcl_FindHashEntry(&styleTable, styleName)) == NULL) {

        return NULL;

    }

    return (Tix_DItemStyle *)Tcl_GetHashValue(hashPtr);

}

/*----------------------------------------------------------------------

 * TixDItemStyleChanged --

 *

 *      Tell each Ditem that are affected by this style that the style

 *      has changed. The Ditems will respond by updating their

 *      attributes according to the new values of the style.

 *----------------------------------------------------------------------

 */

void TixDItemStyleChanged(diTypePtr, stylePtr)

    Tix_DItemInfo * diTypePtr;

    Tix_DItemStyle * stylePtr;

{