Added TIP#48 style engine implementation

Frederic Bonnet to supply docs+tests as soon as possible.

1 files changed, 1663 insertions, 0 deletions

diff --git a/generic/tkStyle.c b/generic/tkStyle.c
new file mode 100644
index 0000000..bb48e21
--- /dev/null
+++ b/generic/tkStyle.c
@@ -0,0 +1,1663 @@
+/* 

+ * tkStyle.c --

+ *

+ *	This file implements the widget styles and themes support.

+ *

+ * Copyright (c) 1990-1993 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.

+ *

+ * RCS: @(#) $Id: tkStyle.c,v 1.1 2002/06/18 23:51:46 dkf Exp $

+ */

+

+#include "tkInt.h"

+

+/*

+ * The following structure is used to cache widget option specs matching an 

+ * element's required options defined by Tk_ElementOptionSpecs. It also holds

+ * information behind Tk_StyledElement opaque tokens.

+ */

+

+typedef struct StyledWidgetSpec {

+    struct StyledElement *elementPtr;	/* Pointer to the element holding this

+					 * structure. */

+    Tk_OptionTable optionTable;		/* Option table for the widget class 

+					 * using the element. */

+    CONST Tk_OptionSpec **optionsPtr;	/* Table of option spec pointers, 

+					 * matching the option list provided 

+					 * during element registration. 

+					 * Malloc'd. */

+} StyledWidgetSpec;

+

+/*

+ * Elements are declared using static templates. But static

+ * information must be completed by dynamic information only

+ * accessible at runtime. For each registered element, an instance of

+ * the following structure is stored in each style engine and used to

+ * cache information about the widget types (identified by their

+ * optionTable) that use the given element.

+ */

+

+typedef struct StyledElement {

+    struct Tk_ElementSpec *specPtr;	

+				/* Filled with template provided during 

+				 * registration. NULL means no implementation 

+				 * is available for the current engine. */ 

+    int nbWidgetSpecs;		/* Size of the array below. Number of distinct 

+				 * widget classes (actually, distinct option 

+				 * tables) that used the element so far. */

+    StyledWidgetSpec *widgetSpecs;	

+				/* See above for the structure definition.

+				 * Table grows dynamically as new widgets

+				 * use the element. Malloc'd. */

+} StyledElement;

+

+/*

+ * The following structure holds information behind Tk_StyleEngine opaque 

+ * tokens.

+ */

+

+typedef struct StyleEngine {

+    CONST char *name;		/* Name of engine. Points to a hash key. */

+    StyledElement *elements;	/* Table of widget element descriptors. Each 

+				 * element is indexed by a unique system-wide 

+				 * ID. Table grows dynamically as new elements 

+				 * are registered. Malloc'd*/

+    struct StyleEngine *parentPtr;	

+				/* Parent engine. Engines may be layered to form

+				 * a fallback chain, terminated by the default 

+				 * system engine. */

+} StyleEngine;

+

+/*

+ * Styles are instances of style engines. The following structure holds 

+ * information behind Tk_Style opaque tokens.

+ */

+

+typedef struct Style {

+    int refCount;		/* Number of active uses of this style.

+				 * If this count is 0, then this Style

+				 * structure is no longer valid. */

+    Tcl_HashEntry *hashPtr;	/* Entry in style table for this structure,

+				 * used when deleting it. */

+    CONST char *name;		/* Name of style. Points to a hash key. */

+    StyleEngine *enginePtr;	/* Style engine of which the style is an 

+				 * instance. */

+    ClientData clientData;	/* Data provided during registration. */

+} Style;

+

+/*

+ * Each registered element uses an instance of the following structure. 

+ */

+

+typedef struct Element {

+    CONST char *name;		/* Name of element. Points to a hash key. */

+    int id;			/* Id of element. */

+    int genericId;		/* Id of generic element. */

+    int created;		/* Boolean, whether the element was created 

+				 * explicitly (was registered) or implicitly 

+				 * (by a derived element). */

+} Element;

+

+/*

+ * Thread-local data.

+ */

+

+typedef struct ThreadSpecificData {

+    int nbInit;			/* Number of calls to the init proc. */

+    Tcl_HashTable engineTable;	/* Map a name to a style engine. Keys are 

+				 * strings, values are Tk_StyleEngine 

+				 * pointers. */

+    StyleEngine *defaultEnginePtr;	

+				/* Default, core-defined style engine. Global 

+				 * fallback for all engines. */

+    Tcl_HashTable styleTable;	/* Map a name to a style. Keys are strings, 

+				 * values are Tk_Style pointers.*/

+    int nbElements;		/* Size of the below tables. */

+    Tcl_HashTable elementTable;	/* Map a name to an element Id. Keys are 

+				 * strings, values are integer element IDs. */

+    Element *elements;		/* Array of Elements. */				

+} ThreadSpecificData;

+

+static Tcl_ThreadDataKey dataKey;

+

+/*

+ * Forward declarations for procedures defined later in this file:

+ */

+

+/* TODO: sort alpha. */

+static int		CreateElement _ANSI_ARGS_((char *name, int create));

+static void		DupStyleObjProc _ANSI_ARGS_((Tcl_Obj *srcObjPtr,

+			    Tcl_Obj *dupObjPtr));

+static void		FreeElement _ANSI_ARGS_((Element *elementPtr));

+static void		FreeStyle _ANSI_ARGS_((Style *stylePtr));

+static void		FreeStyledElement _ANSI_ARGS_((

+			    StyledElement *elementPtr));

+static void		FreeStyleEngine _ANSI_ARGS_((

+			    StyleEngine *enginePtr));

+static void		FreeStyleObjProc _ANSI_ARGS_((Tcl_Obj *objPtr));

+static void		FreeWidgetSpec _ANSI_ARGS_((

+			    StyledWidgetSpec *widgetSpecPtr));

+static StyledElement *	GetStyledElement _ANSI_ARGS_((

+			    StyleEngine *enginePtr, int elementId));

+static StyledWidgetSpec * GetWidgetSpec _ANSI_ARGS_((StyledElement *elementPtr,

+			    Tk_OptionTable optionTable));

+static void		InitElement _ANSI_ARGS_((Element *elementPtr, 

+			    CONST char *name, int id, int genericId, 

+			    int created));

+static void		InitStyle _ANSI_ARGS_((Style *stylePtr, 

+			    Tcl_HashEntry *hashPtr, CONST char *name, 

+			    StyleEngine *enginePtr, ClientData clientData));

+static void		InitStyledElement _ANSI_ARGS_((

+			    StyledElement *elementPtr));

+static void		InitStyleEngine _ANSI_ARGS_((StyleEngine *enginePtr,

+			    CONST char *name, StyleEngine *parentPtr));

+static void		InitWidgetSpec _ANSI_ARGS_((

+			    StyledWidgetSpec *widgetSpecPtr, 

+			    StyledElement *elementPtr, 

+			    Tk_OptionTable optionTable));

+static int		SetStyleFromAny _ANSI_ARGS_((Tcl_Interp *interp,

+			    Tcl_Obj *objPtr));

+

+/*

+ * The following structure defines the implementation of the "style" Tcl

+ * object, used for drawing. The internalRep.otherValuePtr field of

+ * each style object points to the Style structure for the stylefont, or

+ * NULL.

+ */

+

+static Tcl_ObjType styleObjType = {

+    "style",			/* name */

+    FreeStyleObjProc,		/* freeIntRepProc */

+    DupStyleObjProc,		/* dupIntRepProc */

+    NULL,			/* updateStringProc */

+    SetStyleFromAny		/* setFromAnyProc */

+};

+

+/*

+ *---------------------------------------------------------------------------

+ *

+ * TkStylePkgInit --

+ *

+ *	This procedure is called when an application is created.  It

+ *	initializes all the structures that are used by the style

+ *	package on a per application basis.

+ *

+ * Results:

+ *	Stores data in thread-local storage.

+ *

+ * Side effects:

+ *	Memory allocated.

+ *

+ *---------------------------------------------------------------------------

+ */

+

+void

+TkStylePkgInit(mainPtr)

+    TkMainInfo *mainPtr;	/* The application being created. */

+{

+    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) 

+            Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

+

+    if (tsdPtr->nbInit != 0) return;

+

+    /*

+     * Initialize tables.

+     */

+

+    Tcl_InitHashTable(&tsdPtr->engineTable, TCL_STRING_KEYS);

+    Tcl_InitHashTable(&tsdPtr->styleTable, TCL_STRING_KEYS);

+    Tcl_InitHashTable(&tsdPtr->elementTable, TCL_STRING_KEYS);

+    tsdPtr->nbElements = 0;

+    tsdPtr->elements = NULL;

+

+    /*

+     * Create the default system engine.

+     */

+    

+    tsdPtr->defaultEnginePtr = 

+	    (StyleEngine *) Tk_RegisterStyleEngine(NULL, NULL);

+

+    /*

+     * Create the default system style.

+     */

+

+    Tk_CreateStyle(NULL, (Tk_StyleEngine) tsdPtr->defaultEnginePtr, 

+	    (ClientData) 0);

+

+    tsdPtr->nbInit++;

+}

+

+/*

+ *---------------------------------------------------------------------------

+ *

+ * TkStylePkgFree --

+ *

+ *	This procedure is called when an application is deleted.  It

+ *	deletes all the structures that were used by the style package

+ *	for this application.

+ *

+ * Results:

+ *	None.

+ *

+ * Side effects:

+ *	Memory freed.

+ *

+ *---------------------------------------------------------------------------

+ */

+

+void

+TkStylePkgFree(mainPtr)

+    TkMainInfo *mainPtr;	/* The application being deleted. */

+{

+    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) 

+            Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

+    Tcl_HashSearch search;

+    Tcl_HashEntry *entryPtr;

+    StyleEngine *enginePtr;

+    int i;

+

+    tsdPtr->nbInit--;

+    if (tsdPtr->nbInit != 0) return;

+

+    /*

+     * Free styles.

+     */

+

+    entryPtr = Tcl_FirstHashEntry(&tsdPtr->styleTable, &search);

+    while (entryPtr != NULL) {

+	ckfree((char *) Tcl_GetHashValue(entryPtr));

+	entryPtr = Tcl_NextHashEntry(&search);

+    }

+    Tcl_DeleteHashTable(&tsdPtr->styleTable);

+

+    /*

+     * Free engines.

+     */

+

+    entryPtr = Tcl_FirstHashEntry(&tsdPtr->engineTable, &search);

+    while (entryPtr != NULL) {

+	enginePtr = (StyleEngine *) Tcl_GetHashValue(entryPtr);

+	FreeStyleEngine(enginePtr);

+	ckfree((char *) enginePtr);

+	entryPtr = Tcl_NextHashEntry(&search);

+    }

+    Tcl_DeleteHashTable(&tsdPtr->engineTable);

+

+    /*

+     * Free elements.

+     */

+

+    for (i = 0; i < tsdPtr->nbElements; i++) {

+	FreeElement(tsdPtr->elements+i);

+    }

+    Tcl_DeleteHashTable(&tsdPtr->elementTable);

+    ckfree((char *) tsdPtr->elements);

+}

+

+/*

+ *---------------------------------------------------------------------------

+ *

+ * Tk_RegisterStyleEngine --

+ *

+ *	This procedure is called to register a new style engine. Style engines

+ *	are stored in thread-local space.

+ *

+ * Results:

+ *	The newly allocated engine.

+ *

+ * Side effects:

+ *	Memory allocated. Data added to thread-local table.

+ *

+ *---------------------------------------------------------------------------

+ */

+

+Tk_StyleEngine

+Tk_RegisterStyleEngine(name, parent)

+    char *name;			/* Name of the engine to create. NULL or empty

+				 * means the default system engine. */

+    Tk_StyleEngine parent;	/* The engine's parent. NULL means the default 

+				 * system engine. */

+{

+    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) 

+            Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

+    Tcl_HashEntry *entryPtr;

+    int newEntry;

+    StyleEngine *enginePtr;

+

+    /*

+     * Attempt to create a new entry in the engine table. 

+     */

+

+    entryPtr = Tcl_CreateHashEntry(&tsdPtr->engineTable, (name?name:""), 

+	    &newEntry);

+    if (!newEntry) {

+	/*

+	 * An engine was already registered by that name.

+	 */

+

+	return NULL;

+    }

+

+    /*

+     * Allocate and intitialize a new engine.

+     */

+

+    enginePtr = (StyleEngine *) ckalloc(sizeof(StyleEngine));

+    InitStyleEngine(enginePtr, Tcl_GetHashKey(&tsdPtr->engineTable, entryPtr),

+	    (StyleEngine *) parent);

+    Tcl_SetHashValue(entryPtr, (ClientData) enginePtr);

+

+    return (Tk_StyleEngine) enginePtr;

+}

+

+/*

+ *---------------------------------------------------------------------------

+ *

+ * InitStyleEngine --

+ *

+ *	Initialize a newly allocated style engine.

+ *

+ * Results:

+ *	None.

+ *

+ * Side effects:

+ *	Memory allocated.

+ *

+ *---------------------------------------------------------------------------

+ */

+

+static void

+InitStyleEngine(enginePtr, name, parentPtr)

+    StyleEngine *enginePtr;	/* Points to an uninitialized engine. */

+    CONST char *name;		/* Name of the registered engine. NULL or empty

+				 * means the default system engine. Usually

+				 * points to the hash key. */

+    StyleEngine *parentPtr;	/* The engine's parent. NULL means the default 

+				 * system engine. */

+{

+    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) 

+            Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

+    int elementId;

+

+    if (name == NULL || *name == '\0') {

+	/*

+	 * This is the default style engine.

+	 */

+

+	enginePtr->parentPtr = NULL;

+

+    } else if (parentPtr == NULL) {

+	/*

+	 * The default style engine is the parent.

+	 */

+

+	enginePtr->parentPtr = tsdPtr->defaultEnginePtr;

+

+    } else {

+	enginePtr->parentPtr = parentPtr;

+    }

+

+    /* 

+     * Allocate and initialize elements array. 

+     */

+

+    if (tsdPtr->nbElements > 0) {

+	enginePtr->elements = (StyledElement *) ckalloc(

+		sizeof(StyledElement) * tsdPtr->nbElements);

+	for (elementId = 0; elementId < tsdPtr->nbElements; elementId++) {

+	    InitStyledElement(enginePtr->elements+elementId);

+	}

+    } else {

+	enginePtr->elements = NULL;

+    }

+}

+

+/*

+ *---------------------------------------------------------------------------

+ *

+ * FreeStyleEngine --

+ *

+ *	Free an engine and its associated data.

+ *

+ * Results:

+ *	None

+ *

+ * Side effects:

+ *	Memory freed.

+ *

+ *---------------------------------------------------------------------------

+ */

+

+static void

+FreeStyleEngine(enginePtr)

+    StyleEngine *enginePtr;	/* The style engine to free. */

+{

+    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) 

+            Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

+    int elementId;

+

+    /*

+     * Free allocated elements.

+     */

+

+    for (elementId = 0; elementId < tsdPtr->nbElements; elementId++) {

+	FreeStyledElement(enginePtr->elements+elementId);

+    }

+    ckfree((char *) enginePtr->elements);

+}

+

+/*

+ *---------------------------------------------------------------------------

+ *

+ * Tk_GetStyleEngine --

+ *

+ *	Retrieve a registered style engine by its name.

+ *

+ * Results:

+ *	A pointer to the style engine, or NULL if none found.

+ *

+ * Side effects:

+ *	None.

+ *

+ *---------------------------------------------------------------------------

+ */

+

+Tk_StyleEngine

+Tk_GetStyleEngine(name)

+    char *name;			/* Name of the engine to retrieve. NULL or

+				 * empty means the default system engine. */

+{

+    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) 

+            Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

+    Tcl_HashEntry *entryPtr;

+

+    if (name == NULL) {

+	return (Tk_StyleEngine) tsdPtr->defaultEnginePtr;

+    }

+

+    entryPtr = Tcl_FindHashEntry(&tsdPtr->engineTable, (name?name:""));

+    if (!entryPtr) {

+	return NULL;

+    }

+

+    return (Tk_StyleEngine) Tcl_GetHashValue(entryPtr);

+}

+

+/*

+ *---------------------------------------------------------------------------

+ *

+ * InitElement --

+ *

+ *	Initialize a newly allocated element.

+ *

+ * Results:

+ *	None.

+ *

+ * Side effects:

+ *	None.

+ *

+ *---------------------------------------------------------------------------

+ */

+

+static void

+InitElement(elementPtr, name, id, genericId, created)

+    Element *elementPtr;	/* Points to an uninitialized element.*/

+    CONST char *name;		/* Name of the registered element. Usually

+				 * points to the hash key. */

+    int id;			/* Unique element ID. */

+    int genericId;		/* ID of generic element. -1 means none. */

+    int created;		/* Boolean, whether the element was created 

+				 * explicitly (was registered) or implicitly 

+				 * (by a derived element). */

+{

+    elementPtr->name = name;

+    elementPtr->id = id;

+    elementPtr->genericId = genericId;

+    elementPtr->created = (created?1:0);

+}

+

+/*

+ *---------------------------------------------------------------------------

+ *

+ * FreeElement --

+ *

+ *	Free an element and its associated data.

+ *

+ * Results:

+ *	None.

+ *

+ * Side effects:

+ *	Memory freed.

+ *

+ *---------------------------------------------------------------------------

+ */

+

+static void

+FreeElement(elementPtr)

+    Element *elementPtr;	/* The element to free. */

+{

+    /* Nothing to do. */

+}

+

+/*

+ *---------------------------------------------------------------------------

+ *

+ * InitStyledElement --

+ *

+ *	Initialize a newly allocated styled element.

+ *

+ * Results:

+ *	None.

+ *

+ * Side effects:

+ *	None.

+ *

+ *---------------------------------------------------------------------------

+ */

+

+static void

+InitStyledElement(elementPtr)

+    StyledElement *elementPtr;	/* Points to an uninitialized element.*/

+{

+    memset(elementPtr, 0, sizeof(StyledElement));

+}

+

+/*

+ *---------------------------------------------------------------------------

+ *

+ * FreeStyledElement --

+ *

+ *	Free a styled element and its associated data.

+ *

+ * Results:

+ *	None.

+ *

+ * Side effects:

+ *	Memory freed.

+ *

+ *---------------------------------------------------------------------------

+ */

+

+static void

+FreeStyledElement(elementPtr)

+    StyledElement *elementPtr;	/* The styled element to free. */

+{

+    int i;

+

+    /*

+     * Free allocated widget specs.

+     */

+

+    for (i = 0; i < elementPtr->nbWidgetSpecs; i++) {

+	FreeWidgetSpec(elementPtr->widgetSpecs+i);

+    }

+    ckfree((char *) elementPtr->widgetSpecs);

+}

+

+/*

+ *---------------------------------------------------------------------------

+ *

+ * CreateElement --

+ *

+ *	Find an existing or create a new element.

+ *

+ * Results:

+ *	The unique ID for the created or found element.

+ *

+ * Side effects:

+ *	Memory allocated.

+ *

+ *---------------------------------------------------------------------------

+ */

+

+static int

+CreateElement(name, create)

+    char *name;		/* Name of the element. */

+    int create;		/* Boolean, whether the element is being created 

+			 * explicitly (being registered) or implicitly (by a 

+			 * derived element). */

+{

+    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) 

+            Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

+    Tcl_HashEntry *entryPtr, *engineEntryPtr;

+    Tcl_HashSearch search;

+    int newEntry;

+    int elementId, genericId = -1;

+    char *dot;

+    StyleEngine *enginePtr;

+

+    /*

+     * Find or create the element.

+     */

+

+    entryPtr = Tcl_CreateHashEntry(&tsdPtr->elementTable, name, &newEntry);

+    if (!newEntry) {

+	elementId = (int) Tcl_GetHashValue(entryPtr);

+	if (create) {

+	    tsdPtr->elements[elementId].created = 1;

+	}

+	return elementId;

+    }

+

+    /*

+     * The element didn't exist. If it's a derived element, find or

+     * create its generic element ID.

+     */

+

+    dot = strchr(name, '.');

+    if (dot) {

+	genericId = CreateElement(dot+1, 0);

+    }

+

+    elementId = tsdPtr->nbElements++;

+    Tcl_SetHashValue(entryPtr, (ClientData) elementId);

+

+    /*

+     * Reallocate element table.

+     */

+

+    tsdPtr->elements = (Element *) ckrealloc((char *) tsdPtr->elements, 

+	    sizeof(Element) * tsdPtr->nbElements);

+    InitElement(tsdPtr->elements+elementId, 

+	    Tcl_GetHashKey(&tsdPtr->elementTable, entryPtr), elementId,

+	    genericId, create);

+

+    /*

+     * Reallocate style engines' element table.

+     */

+

+    engineEntryPtr = Tcl_FirstHashEntry(&tsdPtr->engineTable, &search);

+    while (engineEntryPtr != NULL) {

+	enginePtr = (StyleEngine *) Tcl_GetHashValue(engineEntryPtr);

+

+	enginePtr->elements = (StyledElement *) ckrealloc(

+		(char *) enginePtr->elements, 

+		sizeof(StyledElement) * tsdPtr->nbElements);

+	InitStyledElement(enginePtr->elements+elementId);

+

+	engineEntryPtr = Tcl_NextHashEntry(&search);

+    }

+

+    return elementId;

+}

+

+/*

+ *---------------------------------------------------------------------------

+ *

+ * Tk_GetElementId --

+ *

+ *	Find an existing element.

+ *

+ * Results:

+ *	The unique ID for the found element, or -1 if not found.

+ *

+ * Side effects:

+ *	Generic elements may be created.

+ *

+ *---------------------------------------------------------------------------

+ */

+

+int

+Tk_GetElementId(name)

+    char *name;		/* Name of the element. */

+{

+    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) 

+            Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

+    Tcl_HashEntry *entryPtr;

+    int genericId = -1;

+    char *dot;

+

+    /*

+     * Find the element Id.

+     */

+

+    entryPtr = Tcl_FindHashEntry(&tsdPtr->elementTable, name);

+    if (entryPtr) {

+	return (int) Tcl_GetHashValue(entryPtr);

+    }

+

+    /*

+     * Element not found. If the given name was derived, then first search for 

+     * the generic element. If found, create the new derived element.

+     */

+

+    dot = strchr(name, '.');

+    if (!dot) {

+	return -1;

+    }

+    genericId = Tk_GetElementId(dot+1);

+    if (genericId == -1) {

+	return -1;

+    }

+    if (!tsdPtr->elements[genericId].created) {

+	/* 

+	 * The generic element was created implicitly and thus has no real

+	 * existence.

+	 */

+

+	return -1;

+    } else {

+	/*

+	 * The generic element was created explicitly. Create the derived

+	 * element.

+	 */

+

+	return CreateElement(name, 1);

+    }

+}

+

+/*

+ *---------------------------------------------------------------------------

+ *

+ * Tk_RegisterStyledElement --

+ *

+ *	Register an implementation of a new or existing element for the

+ *	given style engine.

+ *

+ * Results:

+ *	The unique ID for the created or found element.

+ *

+ * Side effects:

+ *	Elements may be created. Memory allocated.

+ *

+ *---------------------------------------------------------------------------

+ */

+

+int

+Tk_RegisterStyledElement(engine, templatePtr)

+    Tk_StyleEngine engine;		/* Style engine providing the

+					 * implementation. */

+    Tk_ElementSpec *templatePtr;	/* Static template information about

+					 * the element. */

+{

+    int elementId;

+    StyledElement *elementPtr;

+    Tk_ElementSpec *specPtr;

+    int nbOptions;

+    register Tk_ElementOptionSpec *srcOptions, *dstOptions;

+

+    if (templatePtr->version != TK_STYLE_VERSION_1) {

+	/*

+	 * Version mismatch. Do nothing.

+	 */

+

+	return -1;

+    }

+

+    if (engine == NULL) {

+	engine = Tk_GetStyleEngine(NULL);

+    }

+

+    /*

+     * Register the element, allocating storage in the various engines if 

+     * necessary.

+     */

+

+    elementId = CreateElement(templatePtr->name, 1);

+

+    /*

+     * Initialize the styled element.

+     */

+

+    elementPtr = ((StyleEngine *) engine)->elements+elementId;

+

+    specPtr = (Tk_ElementSpec *) ckalloc(sizeof(Tk_ElementSpec));

+    specPtr->version = templatePtr->version;

+    specPtr->name = ckalloc(strlen(templatePtr->name)+1);

+    strcpy(specPtr->name, templatePtr->name);

+    nbOptions = 0;

+    for (nbOptions = 0, srcOptions = templatePtr->options;

+	 srcOptions->name != NULL;

+	 nbOptions++, srcOptions++);

+    specPtr->options = (Tk_ElementOptionSpec *) ckalloc(

+	    sizeof(Tk_ElementOptionSpec) * (nbOptions+1));

+    for (srcOptions = templatePtr->options, dstOptions = specPtr->options;

+	 /* End condition within loop */;

+	 srcOptions++, dstOptions++) {

+	if (srcOptions->name == NULL) {

+	    dstOptions->name = NULL;

+	    break;

+	}

+

+	dstOptions->name = ckalloc(strlen(srcOptions->name)+1);

+	strcpy(dstOptions->name, srcOptions->name);

+	dstOptions->type = srcOptions->type;

+    }

+    specPtr->getSize = templatePtr->getSize;

+    specPtr->getBox = templatePtr->getBox;

+    specPtr->getBorderWidth = templatePtr->getBorderWidth;

+    specPtr->draw = templatePtr->draw;

+

+    elementPtr->specPtr = specPtr;

+    elementPtr->nbWidgetSpecs = 0;

+    elementPtr->widgetSpecs = NULL;

+

+    return elementId;

+}

+

+/*

+ *---------------------------------------------------------------------------

+ *

+ * GetStyledElement --

+ *

+ *	Get a registered implementation of an existing element for the

+ *	given style engine.

+ *

+ * Results:

+ *	The styled element descriptor, or NULL if not found.

+ *

+ * Side effects:

+ *	None.

+ *

+ *---------------------------------------------------------------------------

+ */

+

+static StyledElement *

+GetStyledElement(enginePtr, elementId)

+    StyleEngine *enginePtr;	/* Style engine providing the implementation. 

+				 * NULL means the default system engine. */

+    int elementId;		/* Unique element ID */{

+    StyledElement *elementPtr;

+    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) 

+	    Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

+    StyleEngine *enginePtr2;

+

+    if (enginePtr == NULL) {

+	enginePtr = tsdPtr->defaultEnginePtr;

+    }

+

+    while (elementId >= 0 && elementId < tsdPtr->nbElements) {

+	/*

+	 * Look for an implemented element through the engine chain.

+	 */

+

+	enginePtr2 = enginePtr;

+	do {

+	    elementPtr = enginePtr2->elements+elementId;

+	    if (elementPtr->specPtr != NULL) {

+		return elementPtr;

+	    }

+	    enginePtr2 = enginePtr2->parentPtr;

+	} while (enginePtr2 != NULL);

+

+	/*

+	 * None found, try with the generic element.

+	 */

+

+	elementId = tsdPtr->elements[elementId].genericId;

+    }

+

+    /*

+     * No matching element found.

+     */

+

+    return NULL;

+}

+

+/*

+ *---------------------------------------------------------------------------

+ *

+ * InitWidgetSpec --

+ *

+ *	Initialize a newly allocated widget spec.

+ *

+ * Results:

+ *	None.

+ *

+ * Side effects:

+ *	Memory allocated.

+ *

+ *---------------------------------------------------------------------------

+ */

+

+static void

+InitWidgetSpec(widgetSpecPtr, elementPtr, optionTable)

+    StyledWidgetSpec *widgetSpecPtr;	/* Points to an uninitialized widget

+					 * spec. */

+    StyledElement *elementPtr;		/* Styled element descriptor. */

+    Tk_OptionTable optionTable;		/* The widget's option table. */

+{

+    int i, nbOptions;

+    Tk_ElementOptionSpec *elementOptionPtr;

+    CONST Tk_OptionSpec *widgetOptionPtr;

+

+    widgetSpecPtr->elementPtr = elementPtr;

+    widgetSpecPtr->optionTable = optionTable;

+    

+    /*

+     * Count the number of options.

+     */

+

+    for (nbOptions = 0, elementOptionPtr = elementPtr->specPtr->options; 

+	    elementOptionPtr->name != NULL;

+	    nbOptions++, elementOptionPtr++) {

+    }

+

+    /*

+     * Build the widget option list.

+     */

+

+    widgetSpecPtr->optionsPtr = (CONST Tk_OptionSpec **) ckalloc(

+	    sizeof(Tk_OptionSpec *) * nbOptions);

+    for (i = 0, elementOptionPtr = elementPtr->specPtr->options; 

+	    i < nbOptions;

+	    i++, elementOptionPtr++) {

+	widgetOptionPtr = TkGetOptionSpec(elementOptionPtr->name, optionTable);

+

+	/*

+	 * Check that the widget option type is compatible with one of the 

+	 * element's required types.

+	 */

+

+	if (   elementOptionPtr->type == TK_OPTION_END

+	    || elementOptionPtr->type == widgetOptionPtr->type) {

+	    widgetSpecPtr->optionsPtr[i] = widgetOptionPtr;

+	} else {

+	    widgetSpecPtr->optionsPtr[i] = NULL;

+	}

+    }

+}

+

+/*

+ *---------------------------------------------------------------------------

+ *

+ * FreeWidgetSpec --

+ *

+ *	Free a widget spec and its associated data.

+ *

+ * Results:

+ *	None

+ *

+ * Side effects:

+ *	Memory freed.

+ *

+ *---------------------------------------------------------------------------

+ */

+

+static void

+FreeWidgetSpec(widgetSpecPtr)

+    StyledWidgetSpec *widgetSpecPtr;	/* The widget spec to free. */

+{

+    ckfree((char *) widgetSpecPtr->optionsPtr);

+}

+

+/*

+ *---------------------------------------------------------------------------

+ *

+ * GetWidgetSpec --

+ *

+ *	Return a new or existing widget spec for the given element and

+ *	widget type (identified by its option table).

+ *

+ * Results:

+ *	A pointer to the matching widget spec.

+ *

+ * Side effects:

+ *	Memory may be allocated.

+ *

+ *---------------------------------------------------------------------------

+ */

+

+static StyledWidgetSpec *

+GetWidgetSpec(elementPtr, optionTable)

+    StyledElement *elementPtr;		/* Styled element descriptor. */

+    Tk_OptionTable optionTable;		/* The widget's option table. */

+{

+    StyledWidgetSpec *widgetSpecPtr;

+    int i;

+

+    /*

+     * Try to find an existing widget spec.

+     */

+

+    for (i = 0; i < elementPtr->nbWidgetSpecs; i++) {

+	widgetSpecPtr = elementPtr->widgetSpecs+i;

+	if (widgetSpecPtr->optionTable == optionTable) {

+	    return widgetSpecPtr;

+	}

+    }

+

+    /*

+     * Create and initialize a new widget spec.

+     */

+

+    i = elementPtr->nbWidgetSpecs++;

+    elementPtr->widgetSpecs = (StyledWidgetSpec *) ckrealloc(

+	    (char *) elementPtr->widgetSpecs, 

+	    sizeof(StyledWidgetSpec) * elementPtr->nbWidgetSpecs);

+    widgetSpecPtr = elementPtr->widgetSpecs+i;

+    InitWidgetSpec(widgetSpecPtr, elementPtr, optionTable);

+

+    return widgetSpecPtr;

+}

+

+/*

+ *---------------------------------------------------------------------------

+ *

+ * Tk_GetStyledElement --

+ *

+ *	This procedure returns a styled instance of the given element.

+ *

+ * Results:

+ *	None.

+ *

+ * Side effects:

+ *	Cached data may be allocated or updated.

+ *

+ *---------------------------------------------------------------------------

+ */

+

+Tk_StyledElement

+Tk_GetStyledElement(style, elementId, optionTable)

+    Tk_Style style;		/* The widget style. */

+    int elementId;		/* Unique element ID. */

+    Tk_OptionTable optionTable;	/* Option table for the widget. */

+{

+    Style *stylePtr = (Style *) style;

+    StyledElement *elementPtr;

+

+    /*

+     * Get an element implementation and call corresponding hook.

+     */

+

+    elementPtr = GetStyledElement((stylePtr?stylePtr->enginePtr:NULL), 

+	    elementId);

+    if (!elementPtr) {

+	return NULL;

+    }

+

+    return (Tk_StyledElement) GetWidgetSpec(elementPtr, optionTable);

+}

+

+/*

+ *---------------------------------------------------------------------------

+ *

+ * Tk_GetElementSize --

+ *

+ *	This procedure computes the size of the given widget element according

+ *	to its style.

+ *

+ * Results:

+ *	None.

+ *

+ * Side effects:

+ *	Cached data may be allocated or updated.

+ *

+ *---------------------------------------------------------------------------

+ */

+

+void

+Tk_GetElementSize(style, element, recordPtr, tkwin, width, height, inner, widthPtr, 

+	heightPtr)

+    Tk_Style style;			/* The widget style. */

+    Tk_StyledElement element;		/* The styled element, previously

+					 * returned by Tk_GetStyledElement. */

+    char *recordPtr;			/* The widget record. */

+    Tk_Window tkwin;			/* The widget window. */

+    int width, height;			/* Requested size. */

+    int inner;				/* Boolean. If TRUE, compute the outer

+					 * size according to the requested

+					 * minimum inner size. If FALSE, compute

+					 * the inner size according to the 

+					 * requested maximum outer size. */

+    int *widthPtr, *heightPtr;		/* Returned size. */

+{

+    Style *stylePtr = (Style *) style;

+    StyledWidgetSpec *widgetSpecPtr = (StyledWidgetSpec *) element;

+

+    widgetSpecPtr->elementPtr->specPtr->getSize(stylePtr->clientData, 

+	    recordPtr, widgetSpecPtr->optionsPtr, tkwin, width, height, inner, 

+	    widthPtr, heightPtr);

+}

+

+/*

+ *---------------------------------------------------------------------------

+ *

+ * Tk_GetElementBox --

+ *

+ *	This procedure computes the bounding or inscribed box coordinates

+ *	of the given widget element according to its style and within the

+ *	given limits.

+ *

+ * Results:

+ *	None.

+ *

+ * Side effects:

+ *	Cached data may be allocated or updated.

+ *

+ *---------------------------------------------------------------------------

+ */

+

+void

+Tk_GetElementBox(style, element, recordPtr, tkwin, x, y, width, height, inner, 

+	xPtr, yPtr, widthPtr, heightPtr)

+    Tk_Style style;			/* The widget style. */

+    Tk_StyledElement element;		/* The styled element, previously

+					 * returned by Tk_GetStyledElement. */

+    char *recordPtr;			/* The widget record. */

+    Tk_Window tkwin;			/* The widget window. */

+    int x, y;				/* Top left corner of available area. */

+    int width, height;			/* Size of available area. */

+    int inner;				/* Boolean. If TRUE, compute the 

+					 * bounding box according to the 

+					 * requested inscribed box size. If 

+					 * FALSE, compute the inscribed box 

+					 * according to the requested bounding

+					 * box. */

+    int *xPtr, *yPtr;			/* Returned top left corner. */

+    int *widthPtr, *heightPtr;		/* Returned size. */

+{

+    Style *stylePtr = (Style *) style;

+    StyledWidgetSpec *widgetSpecPtr = (StyledWidgetSpec *) element;

+

+    widgetSpecPtr->elementPtr->specPtr->getBox(stylePtr->clientData, 

+	    recordPtr, widgetSpecPtr->optionsPtr, tkwin, x, y, width, height, 

+	    inner, xPtr, yPtr, widthPtr, heightPtr);

+}

+

+/*

+ *---------------------------------------------------------------------------

+ *

+ * Tk_GetElementBorderWidth --

+ *

+ *	This procedure computes the border widthof the given widget element 

+ *	according to its style and within the given limits.

+ *

+ * Results:

+ *	Border width in pixels. This value is uniform for all four sides.

+ *

+ * Side effects:

+ *	Cached data may be allocated or updated.

+ *

+ *---------------------------------------------------------------------------

+ */

+

+int

+Tk_GetElementBorderWidth(style, element, recordPtr, tkwin)

+    Tk_Style style;			/* The widget style. */

+    Tk_StyledElement element;		/* The styled element, previously

+					 * returned by Tk_GetStyledElement. */

+    char *recordPtr;			/* The widget record. */

+    Tk_Window tkwin;			/* The widget window. */

+{

+    Style *stylePtr = (Style *) style;

+    StyledWidgetSpec *widgetSpecPtr = (StyledWidgetSpec *) element;

+

+    return widgetSpecPtr->elementPtr->specPtr->getBorderWidth(

+	    stylePtr->clientData, recordPtr, widgetSpecPtr->optionsPtr, tkwin);

+}

+

+/*

+ *---------------------------------------------------------------------------

+ *

+ * Tk_DrawElement --

+ *

+ *	This procedure draw the given widget element in a given drawable area.

+ *

+ * Results:

+ *	None

+ *

+ * Side effects:

+ *	Cached data may be allocated or updated.

+ *

+ *---------------------------------------------------------------------------

+ */

+

+void

+Tk_DrawElement(style, element, recordPtr, tkwin, d, x, y, width, height, state)

+    Tk_Style style;			/* The widget style. */

+    Tk_StyledElement element;		/* The styled element, previously

+					 * returned by Tk_GetStyledElement. */

+    char *recordPtr;			/* The widget record. */

+    Tk_Window tkwin;			/* The widget window. */

+    Drawable d;				/* Where to draw element. */

+    int x, y;				/* Top left corner of element. */

+    int width, height;			/* Size of element. */

+    int state;				/* Drawing state flags. */

+{

+    Style *stylePtr = (Style *) style;

+    StyledWidgetSpec *widgetSpecPtr = (StyledWidgetSpec *) element;

+

+    widgetSpecPtr->elementPtr->specPtr->draw(stylePtr->clientData, 

+	    recordPtr, widgetSpecPtr->optionsPtr, tkwin, d, x, y, width, 

+	    height, state);

+}

+

+/*

+ *---------------------------------------------------------------------------

+ *

+ * Tk_CreateStyle --

+ *

+ *	This procedure is called to create a new style as an instance of the

+ *	given engine. Styles are stored in thread-local space.

+ *

+ * Results:

+ *	The newly allocated style.

+ *

+ * Side effects:

+ *	Memory allocated. Data added to thread-local table. The style's

+ *	refCount is incremented.

+ *

+ *---------------------------------------------------------------------------

+ */

+

+Tk_Style

+Tk_CreateStyle(name, engine, clientData)

+    CONST char *name;		/* Name of the style to create. NULL or empty

+				 * means the default system style. */

+    Tk_StyleEngine engine;	/* The style engine. */

+    ClientData clientData;	/* Private data passed as is to engine code. */

+{

+    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) 

+            Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

+    Tcl_HashEntry *entryPtr;

+    int newEntry;

+    Style *stylePtr;

+

+    /*

+     * Attempt to create a new entry in the style table. 

+     */

+

+    entryPtr = Tcl_CreateHashEntry(&tsdPtr->styleTable, (name?name:""), 

+	    &newEntry);

+    if (!newEntry) {

+	/*

+	 * A style was already registered by that name.

+	 */

+

+	return NULL;

+    }

+

+    /*

+     * Allocate and intitialize a new style.

+     */

+

+    stylePtr = (Style *) ckalloc(sizeof(Style));

+    InitStyle(stylePtr, entryPtr, Tcl_GetHashKey(&tsdPtr->styleTable, entryPtr),

+	    (engine?(StyleEngine *) engine:tsdPtr->defaultEnginePtr), clientData);

+    Tcl_SetHashValue(entryPtr, (ClientData) stylePtr);

+    stylePtr->refCount++;

+

+    return (Tk_Style) stylePtr;

+}

+

+/*

+ *---------------------------------------------------------------------------

+ *

+ * Tk_NameOfStyle --

+ *

+ *	Given a style, return its registered name.

+ *

+ * Results:

+ *	The return value is the name that was passed to Tk_CreateStyle() to 

+ *	create the style.  The storage for the returned string is private

+ *	(it points to the corresponding hash key) The caller should not modify 

+ *	this string.

+ *

+ * Side effects:

+ *	None.

+ *

+ *---------------------------------------------------------------------------

+ */

+

+CONST char *

+Tk_NameOfStyle(style)

+    Tk_Style style;		/* Style whose name is desired. */

+{

+    Style *stylePtr = (Style *) style;

+

+    return stylePtr->name;

+}

+

+/*

+ *---------------------------------------------------------------------------

+ *

+ * InitStyle --

+ *

+ *	Initialize a newly allocated style.

+ *

+ * Results:

+ *	None.

+ *

+ * Side effects:

+ *	None.

+ *

+ *---------------------------------------------------------------------------

+ */

+

+static void

+InitStyle(stylePtr, hashPtr, name, enginePtr, clientData)

+    Style *stylePtr;		/* Points to an uninitialized style. */

+    Tcl_HashEntry *hashPtr;	/* Hash entry for the registered style. */

+    CONST char *name;		/* Name of the registered style. NULL or empty

+				 * means the default system style. Usually

+				 * points to the hash key. */

+    StyleEngine *enginePtr;	/* The style engine. */

+    ClientData clientData;	/* Private data passed as is to engine code. */

+{

+    stylePtr->refCount = 0;

+    stylePtr->hashPtr = hashPtr;

+    stylePtr->name = name;

+    stylePtr->enginePtr = enginePtr;

+    stylePtr->clientData = clientData;

+}

+

+/*

+ *---------------------------------------------------------------------------

+ *

+ * FreeStyle --

+ *

+ *	Free a style and its associated data.

+ *

+ * Results:

+ *	None

+ *

+ * Side effects:

+ *	None.

+ *

+ *---------------------------------------------------------------------------

+ */

+

+static void

+FreeStyle(stylePtr)

+    Style *stylePtr;		/* The style to free. */

+{

+    /* Nothing to do. */

+}

+

+/*

+ *---------------------------------------------------------------------------

+ *

+ * Tk_GetStyle --

+ *

+ *	Retrieve a registered style by its name.

+ *

+ * Results:

+ *	A pointer to the style engine, or NULL if none found.  In the latter

+ *	case and if the interp is not NULL, an error message is left in the 

+ *	interp's result.

+ *

+ * Side effects:

+ *	None.

+ *

+ *---------------------------------------------------------------------------

+ */

+

+Tk_Style

+Tk_GetStyle(interp, name)

+    Tcl_Interp *interp;		/* Interp for error return. */

+    CONST char *name;		/* Name of the style to retrieve. NULL or empty

+				 * means the default system style. */

+{

+    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) 

+            Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

+    Tcl_HashEntry *entryPtr;

+    Style *stylePtr;

+

+    /*

+     * Search for a corresponding entry in the style table. 

+     */

+

+    entryPtr = Tcl_FindHashEntry(&tsdPtr->styleTable, (name?name:""));

+    if (entryPtr == NULL) {

+	if (interp != NULL) {

+	    Tcl_AppendResult(interp, "style \"", name, "\" doesn't exist", NULL);

+	}

+	return (Tk_Style) NULL;

+    }

+    stylePtr = (Style *) Tcl_GetHashValue(entryPtr);

+    stylePtr->refCount++;

+

+    return (Tk_Style) stylePtr;

+}

+

+/*

+ *---------------------------------------------------------------------------

+ *

+ * Tk_FreeStyle --

+ *

+ *	Free a style previously created by Tk_CreateStyle.

+ *

+ * Results:

+ *	None

+ *

+ * Side effects:

+ *	The style's refCount is decremented. If it reaches zero, the style

+ *	is freed.

+ *

+ *---------------------------------------------------------------------------

+ */

+

+void 

+Tk_FreeStyle(style)

+    Tk_Style style;		/* The style to free. */

+{

+    Style *stylePtr = (Style *) style;

+

+    if (stylePtr == NULL) {

+	return;

+    }

+    stylePtr->refCount--;

+    if (stylePtr->refCount > 0) {

+	return;

+    }

+    

+    /*

+     * Keep the default style alive.

+     */

+

+    if (*stylePtr->name == '\0') {

+	stylePtr->refCount = 1;

+	return;

+    }

+

+    Tcl_DeleteHashEntry(stylePtr->hashPtr);

+    FreeStyle(stylePtr);

+    ckfree((char *) stylePtr);

+}

+

+/*

+ *---------------------------------------------------------------------------

+ *

+ * Tk_AllocStyleFromObj -- 

+ *

+ *	Map the string name of a style to a corresponding Tk_Style. The style 

+ *	must have already been created by Tk_CreateStyle.

+ *

+ * Results:

+ *	The return value is a token for the style that matches objPtr, or 

+ *	NULL if none found.  If NULL is returned, an error message will be 

+ *	left in interp's result object.

+ *

+ * Side effects:

+ * 	The style's reference count is incremented. For each call to this 

+ *	procedure, there should eventually be a call to Tk_FreeStyle() or 

+ *	Tk_FreeStyleFromObj() so that the database is cleaned up when styles

+ *	aren't in use anymore.

+ *

+ *---------------------------------------------------------------------------

+ */

+

+Tk_Style

+Tk_AllocStyleFromObj(interp, objPtr)

+    Tcl_Interp *interp;		/* Interp for error return. */

+    Tcl_Obj *objPtr;		/* Object containing name of the style to

+				 * retrieve. */

+{

+    Style *stylePtr;

+

+    if (objPtr->typePtr != &styleObjType) {

+	SetStyleFromAny(interp, objPtr);

+	stylePtr = (Style *) objPtr->internalRep.otherValuePtr;

+    } else {

+	stylePtr = (Style *) objPtr->internalRep.otherValuePtr;

+	stylePtr->refCount++;

+    }

+

+    return (Tk_Style) stylePtr;

+}

+

+/*

+ *----------------------------------------------------------------------

+ *

+ * Tk_GetStyleFromObj --

+ *

+ *	Find the style that corresponds to a given object.  The style must

+ *	have already been created by Tk_CreateStyle.

+ *

+ * Results:

+ *	The return value is a token for the style that matches objPtr, or 

+ *	NULL if none found.

+ *

+ * Side effects:

+ *	If the object is not already a style ref, the conversion will free

+ *	any old internal representation. 

+ *

+ *----------------------------------------------------------------------

+ */

+

+Tk_Style

+Tk_GetStyleFromObj(objPtr)

+    Tcl_Obj *objPtr;		/* The object from which to get the style. */

+{

+    if (objPtr->typePtr != &styleObjType) {

+	SetStyleFromAny((Tcl_Interp *) NULL, objPtr);

+    }

+

+    return (Tk_Style) objPtr->internalRep.otherValuePtr;

+}

+

+/*

+ *---------------------------------------------------------------------------

+ *

+ * Tk_FreeStyleFromObj -- 

+ *

+ *	Called to release a style inside a Tcl_Obj *.

+ *

+ * Results:

+ *	None.

+ *

+ * Side effects:

+ *	If the object is a style ref, the conversion will free its 

+ *	internal representation. 

+ *

+ *---------------------------------------------------------------------------

+ */

+

+void

+Tk_FreeStyleFromObj(objPtr)

+    Tcl_Obj *objPtr;		/* The Tcl_Obj * to be freed. */

+{

+    if (objPtr->typePtr == &styleObjType) {

+	FreeStyleObjProc(objPtr);

+    }

+}

+

+/*

+ *----------------------------------------------------------------------

+ *

+ * SetStyleFromAny --

+ *

+ *	Convert the internal representation of a Tcl object to the

+ *	style internal form.

+ *

+ * Results:

+ *	Always returns TCL_OK.  If an error occurs is returned (e.g. the

+ *	style doesn't exist), an error message will be left in interp's 

+ *	result.

+ *

+ * Side effects:

+ *	The object is left with its typePtr pointing to styleObjType.

+ *	The reference count is incremented (in Tk_GetStyle()).

+ *

+ *----------------------------------------------------------------------

+ */

+

+static int

+SetStyleFromAny(interp, objPtr)

+    Tcl_Interp *interp;		/* Used for error reporting if not NULL. */

+    Tcl_Obj *objPtr;		/* The object to convert. */

+{

+    Tcl_ObjType *typePtr;

+    char *name;

+

+    /*

+     * Free the old internalRep before setting the new one. 

+     */

+

+    name = Tcl_GetString(objPtr);

+    typePtr = objPtr->typePtr;

+    if ((typePtr != NULL) && (typePtr->freeIntRepProc != NULL)) {

+	(*typePtr->freeIntRepProc)(objPtr);

+    }

+

+    objPtr->typePtr = &styleObjType;

+    objPtr->internalRep.otherValuePtr = (VOID *) Tk_GetStyle(interp, name);

+

+    return TCL_OK;

+}

+

+/*

+ *---------------------------------------------------------------------------

+ *

+ * FreeStyleObjProc -- 

+ *

+ *	This proc is called to release an object reference to a style.

+ *	Called when the object's internal rep is released.

+ *

+ * Results:

+ *	None.

+ *

+ * Side effects:

+ *	The reference count is decremented (in Tk_FreeStyle()).

+ *

+ *---------------------------------------------------------------------------

+ */

+

+static void

+FreeStyleObjProc(objPtr)

+    Tcl_Obj *objPtr;		/* The object we are releasing. */

+{

+    Style *stylePtr = (Style *) objPtr->internalRep.otherValuePtr;

+

+    if (stylePtr != NULL) {

+	Tk_FreeStyle((Tk_Style) stylePtr);

+	objPtr->internalRep.otherValuePtr = NULL;

+    }

+}

+

+/*

+ *---------------------------------------------------------------------------

+ *

+ * DupStyleObjProc -- 

+ *

+ *	When a cached style object is duplicated, this is called to

+ *	update the internal reps.

+ *

+ * Results:

+ *	None.

+ *

+ * Side effects:

+ *	The style's refCount is incremented and the internal rep of the copy 

+ *	is set to point to it.

+ *

+ *---------------------------------------------------------------------------

+ */

+

+static void

+DupStyleObjProc(srcObjPtr, dupObjPtr)

+    Tcl_Obj *srcObjPtr;		/* The object we are copying from. */

+    Tcl_Obj *dupObjPtr;		/* The object we are copying to. */

+{

+    Style *stylePtr = (Style *) srcObjPtr->internalRep.otherValuePtr;

+    

+    dupObjPtr->typePtr = srcObjPtr->typePtr;

+    dupObjPtr->internalRep.otherValuePtr = (VOID *) stylePtr;

+

+    if (stylePtr != NULL) {

+	stylePtr->refCount++;

+    }

+}