* doc/ttk_Geometry.3, doc/ttk_Theme.3, doc/ttk_button.n:

	* doc/ttk_checkbutton.n, doc/ttk_combobox.n, doc/ttk_dialog.n:
	* doc/ttk_entry.n, doc/ttk_frame.n, doc/ttk_image.n:
	* doc/ttk_intro.n, doc/ttk_label.n, doc/ttk_labelframe.n:
	* doc/ttk_menubutton.n, doc/ttk_notebook.n, doc/ttk_panedwindow.n:
	* doc/ttk_progressbar.n, doc/ttk_radiobutton.n, doc/ttk_scrollbar.n:
	* doc/ttk_separator.n, doc/ttk_sizegrip.n, doc/ttk_style.n:
	* doc/ttk_treeview.n, doc/ttk_widget.n,:
	* generic/ttk/ttk.decls, generic/ttk/ttkBlink.c:
	* generic/ttk/ttkButton.c, generic/ttk/ttkCache.c:
	* generic/ttk/ttkClamTheme.c, generic/ttk/ttkClassicTheme.c:
	* generic/ttk/ttkDecls.h, generic/ttk/ttkDefaultTheme.c:
	* generic/ttk/ttkElements.c, generic/ttk/ttkEntry.c:
	* generic/ttk/ttkFrame.c, generic/ttk/ttkImage.c:
	* generic/ttk/ttkInit.c, generic/ttk/ttkLabel.c:
	* generic/ttk/ttkLayout.c, generic/ttk/ttkManager.c:
	* generic/ttk/ttkManager.h, generic/ttk/ttkNotebook.c:
	* generic/ttk/ttkPanedwindow.c, generic/ttk/ttkProgress.c:
	* generic/ttk/ttkScale.c, generic/ttk/ttkScroll.c:
	* generic/ttk/ttkScrollbar.c, generic/ttk/ttkSeparator.c:
	* generic/ttk/ttkSquare.c, generic/ttk/ttkState.c:
	* generic/ttk/ttkStubInit.c, generic/ttk/ttkStubLib.c:
	* generic/ttk/ttkTagSet.c, generic/ttk/ttkTheme.c:
	* generic/ttk/ttkTheme.h, generic/ttk/ttkThemeInt.h:
	* generic/ttk/ttkTrace.c, generic/ttk/ttkTrack.c:
	* generic/ttk/ttkTreeview.c, generic/ttk/ttkWidget.c:
	* generic/ttk/ttkWidget.h:
	* library/demos/ttk_demo.tcl, library/demos/ttk_iconlib.tcl:
	* library/demos/ttk_repeater.tcl:
	* library/ttk/altTheme.tcl, library/ttk/aquaTheme.tcl:
	* library/ttk/button.tcl, library/ttk/clamTheme.tcl:
	* library/ttk/classicTheme.tcl, library/ttk/combobox.tcl:
	* library/ttk/cursors.tcl, library/ttk/defaults.tcl:
	* library/ttk/dialog.tcl, library/ttk/entry.tcl:
	* library/ttk/fonts.tcl, library/ttk/icons.tcl:
	* library/ttk/keynav.tcl, library/ttk/menubutton.tcl:
	* library/ttk/notebook.tcl, library/ttk/panedwindow.tcl:
	* library/ttk/progress.tcl, library/ttk/scale.tcl:
	* library/ttk/scrollbar.tcl, library/ttk/sizegrip.tcl:
	* library/ttk/treeview.tcl, library/ttk/ttk.tcl:
	* library/ttk/utils.tcl, library/ttk/winTheme.tcl:
	* library/ttk/xpTheme.tcl:
	* macosx/ttkMacOSXTheme.c:
	* tests/ttk/all.tcl, tests/ttk/bwidget.test, tests/ttk/combobox.test:
	* tests/ttk/entry.test, tests/ttk/image.test:
	* tests/ttk/labelframe.test, tests/ttk/layout.test:
	* tests/ttk/misc.test, tests/ttk/notebook.test:
	* tests/ttk/panedwindow.test, tests/ttk/progressbar.test:
	* tests/ttk/scrollbar.test, tests/ttk/treetags.test:
	* tests/ttk/treeview.test, tests/ttk/ttk.test, tests/ttk/validate.test:
	* win/ttkWinMonitor.c, win/ttkWinTheme.c, win/ttkWinXPTheme.c:
	First import of Ttk themed Tk widgets as branched from tile 0.7.8

	* generic/tkInt.h, generic/tkWindow.c: add Ttk_Init call, copy
	tk classic widgets to ::tk namespace.
	* library/tk.tcl: add source of ttk/ttk.tcl, define $::ttk::library.
	* unix/Makefile.in, win/Makefile.in: add Ttk build bits
	* win/configure, win/configure.in: check for uxtheme.h (XP theme).

1 files changed, 2973 insertions, 0 deletions

diff --git a/generic/ttk/ttkTreeview.c b/generic/ttk/ttkTreeview.c
new file mode 100644
index 0000000..4038a5d
--- /dev/null
+++ b/generic/ttk/ttkTreeview.c
@@ -0,0 +1,2973 @@
+/*
+ * $Id: ttkTreeview.c,v 1.1 2006/10/31 01:42:26 hobbs Exp $
+ * Copyright (c) 2004, Joe English
+ *
+ * Ttk widget set: treeview widget.
+ */
+
+#include <string.h>
+#include <tk.h>
+#include "ttkTheme.h"
+#include "ttkWidget.h"
+
+#define DEF_TREE_ROWS		"10"
+#define DEF_TREE_PADDING	"4"
+#define DEF_COLWIDTH		"200"
+
+static const int ROWHEIGHT 	= 24;
+static const int HEADINGHEIGHT	= 24;
+static const int INDENT 	= 24;
+static const int HALO   	= 4;	/* separator */
+
+#define TTK_STATE_OPEN TTK_STATE_USER1
+#define TTK_STATE_LEAF TTK_STATE_USER2
+
+#define STATE_CHANGED	 	(0x100)	/* item state option changed */
+
+/*------------------------------------------------------------------------
+ * +++ Tree items.
+ *
+ * INVARIANTS:
+ * 	item->children	==> item->children->parent == item
+ *	item->next	==> item->next->parent == item->parent
+ * 	item->next 	==> item->next->prev == item
+ * 	item->prev 	==> item->prev->next == item
+ */
+
+typedef struct TreeItemRec TreeItem;
+struct TreeItemRec
+{
+    Tcl_HashEntry *entryPtr;	/* Back-pointer to hash table entry */
+    TreeItem	*parent;	/* Parent item */
+    TreeItem	*children;	/* Linked list of child items */
+    TreeItem	*next;		/* Next sibling */
+    TreeItem	*prev;		/* Previous sibling */
+
+    /*
+     * Options and instance data:
+     */
+    Ttk_State 	state;
+    Tcl_Obj	*textObj;
+    Tcl_Obj	*imageObj;
+    Tcl_Obj	*valuesObj;
+    Tcl_Obj	*openObj;
+    Tcl_Obj	*tagsObj;
+};
+
+static Tk_OptionSpec ItemOptionSpecs[] =
+{
+    {TK_OPTION_STRING, "-text", "text", "Text",
+	"", Tk_Offset(TreeItem,textObj), -1,
+	0,0,0 },
+    {TK_OPTION_STRING, "-image", "image", "Image",
+	NULL, Tk_Offset(TreeItem,imageObj), -1,
+	TK_OPTION_NULL_OK,0,0 },
+    {TK_OPTION_STRING, "-values", "values", "Values",
+	NULL, Tk_Offset(TreeItem,valuesObj), -1,
+	TK_OPTION_NULL_OK,0,0 },
+    {TK_OPTION_BOOLEAN, "-open", "open", "Open",
+	"0", Tk_Offset(TreeItem,openObj), -1,
+	0,0,0 },
+    {TK_OPTION_STRING, "-tags", "tags", "Tags",
+	NULL, Tk_Offset(TreeItem,tagsObj), -1,
+	TK_OPTION_NULL_OK,0,0 },
+
+    {TK_OPTION_END, 0,0,0, NULL, -1,-1, 0,0,0}
+};
+
+/* + NewItem --
+ * 	Allocate a new, uninitialized, unlinked item
+ */
+static TreeItem *NewItem(void)
+{
+    TreeItem *item = (TreeItem*)ckalloc(sizeof(*item));
+
+    item->entryPtr = 0;
+    item->parent = item->children = item->next = item->prev = NULL;
+
+    item->state = 0ul;
+    item->textObj = NULL;
+    item->imageObj = NULL;
+    item->valuesObj = NULL;
+    item->openObj = NULL;
+    item->tagsObj = NULL;
+
+    return item;
+}
+
+/* + FreeItem --
+ * 	Destroy an item
+ */
+static void FreeItem(TreeItem *item)
+{
+    if (item->textObj) { Tcl_DecrRefCount(item->textObj); }
+    if (item->imageObj) { Tcl_DecrRefCount(item->imageObj); }
+    if (item->valuesObj) { Tcl_DecrRefCount(item->valuesObj); }
+    if (item->openObj) { Tcl_DecrRefCount(item->openObj); }
+    if (item->tagsObj) { Tcl_DecrRefCount(item->tagsObj); }
+    ckfree((ClientData)item);
+}
+
+static void FreeItemCB(void *clientData) { FreeItem(clientData); }
+
+/* + DetachItem --
+ * 	Unlink an item from the tree.
+ */
+static void DetachItem(TreeItem *item)
+{
+    if (item->parent && item->parent->children == item)
+	item->parent->children = item->next;
+    if (item->prev)
+	item->prev->next = item->next;
+    if (item->next)
+	item->next->prev = item->prev;
+    item->next = item->prev = item->parent = NULL;
+}
+
+/* + InsertItem --
+ * 	Insert an item into the tree after the specified item.
+ *
+ * Preconditions:
+ * 	+ item is currently detached
+ * 	+ prev != NULL ==> prev->parent == parent.
+ */
+static void InsertItem(TreeItem *parent, TreeItem *prev, TreeItem *item)
+{
+    item->parent = parent;
+    item->prev = prev;
+    if (prev) {
+	item->next = prev->next;
+	prev->next = item;
+    } else {
+	item->next = parent->children;
+	parent->children = item;
+    }
+    if (item->next) {
+	item->next->prev = item;
+    }
+}
+
+/* + NextPreorder --
+ * 	Return the next item in preorder traversal order.
+ */
+
+static TreeItem *NextPreorder(TreeItem *item)
+{
+    if (item->children)
+	return item->children;
+    while (!item->next) {
+	item = item->parent;
+	if (!item)
+	    return 0;
+    }
+    return item->next;
+}
+
+/*------------------------------------------------------------------------
+ * +++ Display items and tag options.
+ */
+
+typedef struct {
+    Tcl_Obj *textObj;		/* taken from item / data cell */
+    Tcl_Obj *imageObj;		/* taken from item */
+    Tcl_Obj *anchorObj;		/* from column */
+    Tcl_Obj *backgroundObj;	/* remainder from tag */
+    Tcl_Obj *foregroundObj;	
+    Tcl_Obj *fontObj;
+} DisplayItem;
+
+static Tk_OptionSpec TagOptionSpecs[] =
+{
+    {TK_OPTION_STRING, "-text", "text", "Text",
+	NULL, Tk_Offset(DisplayItem,textObj), -1,
+	TK_OPTION_NULL_OK,0,0 },
+    {TK_OPTION_STRING, "-image", "image", "Image",
+	NULL, Tk_Offset(DisplayItem,imageObj), -1,
+	TK_OPTION_NULL_OK,0,0 },
+    {TK_OPTION_ANCHOR, "-anchor", "anchor", "Anchor",
+	NULL, Tk_Offset(DisplayItem,anchorObj), -1, 
+	TK_OPTION_NULL_OK, 0, GEOMETRY_CHANGED},
+    {TK_OPTION_COLOR, "-background", "windowColor", "WindowColor", 
+	NULL, Tk_Offset(DisplayItem,backgroundObj), -1,
+	TK_OPTION_NULL_OK,0,0 },
+    {TK_OPTION_COLOR, "-foreground", "textColor", "TextColor", 
+	NULL, Tk_Offset(DisplayItem,foregroundObj), -1,
+	TK_OPTION_NULL_OK,0,0 },
+    {TK_OPTION_FONT, "-font", "font", "Font",
+	NULL, Tk_Offset(DisplayItem,fontObj), -1,
+	TK_OPTION_NULL_OK,0,GEOMETRY_CHANGED },
+
+    {TK_OPTION_END, 0,0,0, NULL, -1,-1, 0,0,0}
+};
+
+
+
+/*------------------------------------------------------------------------
+ * +++ Columns.
+ *
+ * There are separate option tables associated with the column record:
+ * ColumnOptionSpecs is for configuring the column,
+ * and HeadingOptionSpecs is for drawing headings.
+ */
+typedef struct {
+    int 	width;		/* Column width, in pixels */
+    Tcl_Obj	*idObj;		/* Column identifier, from -columns option */
+
+    Tcl_Obj	*anchorObj;	/* -anchor for cell data */
+
+    /* Column heading data:
+     */
+    Tcl_Obj 	*headingObj;		/* Heading label */
+    Tcl_Obj	*headingImageObj;	/* Heading image */
+    Tcl_Obj 	*headingAnchorObj;	/* -anchor for heading label */
+    Tcl_Obj	*headingCommandObj;	/* Command to execute */
+    Tcl_Obj 	*headingStateObj;	/* @@@ testing ... */
+    Ttk_State	headingState;		/* ... */
+
+    /* Temporary storage for cell data
+     */
+    Tcl_Obj 	*data;
+} TreeColumn;
+
+static void InitColumn(TreeColumn *column)
+{
+    column->width = 200;
+    column->idObj = 0;
+    column->anchorObj = 0;
+
+    column->headingState = 0;
+    column->headingObj = 0;
+    column->headingImageObj = 0;
+    column->headingAnchorObj = 0;
+    column->headingStateObj = 0;
+    column->headingCommandObj = 0;
+
+    column->data = 0;
+}
+
+static void FreeColumn(TreeColumn *column)	/* @@@ rename */
+{
+    if (column->idObj) { Tcl_DecrRefCount(column->idObj); }
+    if (column->anchorObj) { Tcl_DecrRefCount(column->anchorObj); }
+
+    if (column->headingObj) { Tcl_DecrRefCount(column->headingObj); }
+    if (column->headingImageObj) { Tcl_DecrRefCount(column->headingImageObj); }
+    if (column->headingAnchorObj) { Tcl_DecrRefCount(column->headingAnchorObj); }
+    if (column->headingStateObj) { Tcl_DecrRefCount(column->headingStateObj); }
+    if (column->headingCommandObj) { Tcl_DecrRefCount(column->headingCommandObj); }
+
+    /* Don't touch column->data, it's scratch storage */
+}
+
+static Tk_OptionSpec ColumnOptionSpecs[] =
+{
+    {TK_OPTION_INT, "-width", "width", "Width",
+	DEF_COLWIDTH, -1, Tk_Offset(TreeColumn,width),
+	0,0,GEOMETRY_CHANGED },
+    {TK_OPTION_ANCHOR, "-anchor", "anchor", "Anchor",
+	"w", Tk_Offset(TreeColumn,anchorObj), -1,
+	0,0,0 },
+    {TK_OPTION_STRING, "-id", "id", "ID",
+	NULL, Tk_Offset(TreeColumn,idObj), -1,
+	TK_OPTION_NULL_OK,0,READONLY_OPTION },
+    {TK_OPTION_END, 0,0,0, NULL, -1,-1, 0,0,0}
+};
+
+static Tk_OptionSpec HeadingOptionSpecs[] =
+{
+    {TK_OPTION_STRING, "-text", "text", "Text",
+	"", Tk_Offset(TreeColumn,headingObj), -1,
+	0,0,0 },
+    {TK_OPTION_STRING, "-image", "image", "Image",
+	"", Tk_Offset(TreeColumn,headingImageObj), -1,
+	0,0,0 },
+    {TK_OPTION_ANCHOR, "-anchor", "anchor", "Anchor",
+	"center", Tk_Offset(TreeColumn,headingAnchorObj), -1,
+	0,0,0 },
+    {TK_OPTION_STRING, "-command", "", "",
+	"", Tk_Offset(TreeColumn,headingCommandObj), -1,
+	TK_OPTION_NULL_OK,0,0 },
+    {TK_OPTION_STRING, "state", "", "",
+	"", Tk_Offset(TreeColumn,headingStateObj), -1,
+	0,0,STATE_CHANGED },
+    {TK_OPTION_END, 0,0,0, NULL, -1,-1, 0,0,0}
+};
+
+/*------------------------------------------------------------------------
+ * +++ -show option:
+ * TODO: Implement SHOW_BRANCHES.
+ */
+
+#define SHOW_TREE 	(0x1) 	/* Show tree column? */
+#define SHOW_HEADINGS	(0x2)	/* Show heading row? */
+
+#define DEFAULT_SHOW	"tree headings"
+
+static const char *showStrings[] = {
+    "tree", "headings", NULL
+};
+
+static int GetEnumSetFromObj(
+    Tcl_Interp *interp,
+    Tcl_Obj *objPtr,
+    const char *table[],
+    unsigned *resultPtr)
+{
+    unsigned result = 0;
+    int i, objc;
+    Tcl_Obj **objv;
+
+    if (Tcl_ListObjGetElements(interp, objPtr, &objc, &objv) != TCL_OK)
+	return TCL_ERROR;
+
+    for (i = 0; i < objc; ++i) {
+	int index;
+	if (TCL_OK != Tcl_GetIndexFromObj(
+		    interp, objv[i], table, "value", TCL_EXACT, &index))
+	{
+	    return TCL_ERROR;
+	}
+	result |= (1 << index);
+    }
+
+    *resultPtr = result;
+    return TCL_OK;
+}
+
+/*------------------------------------------------------------------------
+ * +++ Treeview widget record.
+ *
+ * Dependencies:
+ * 	columns, columnNames: -columns
+ * 	displayColumns:	-columns, -displaycolumns
+ */
+typedef struct
+{
+    /* Resources acquired at initialization-time:
+     */
+    Tk_OptionTable itemOptionTable;
+    Tk_OptionTable columnOptionTable;
+    Tk_OptionTable headingOptionTable;
+    Tk_OptionTable tagOptionTable;
+    Tk_BindingTable bindingTable;
+    Ttk_TagTable tagTable;
+
+    /* Acquired in GetLayout hook:
+     */
+    Ttk_Layout itemLayout;
+    Ttk_Layout cellLayout;
+    Ttk_Layout headingLayout;
+    Ttk_Layout rowLayout;
+
+    /* Tree data:
+     */
+    Tcl_HashTable items;	/* Map: item name -> item */
+    int serial;			/* Next item # for autogenerated names */
+    TreeItem *root;		/* Root item */
+
+    TreeColumn column0;		/* Column options for display column #0 */
+    TreeColumn *columns;	/* Array of column options for data columns */
+
+    TreeItem *focus;		/* Current focus item */
+
+    /* Widget options:
+     */
+    Tcl_Obj *columnsObj;	/* List of symbolic column names */
+    Tcl_Obj *displayColumnsObj;	/* List of columns to display */
+
+    Tcl_Obj *heightObj;		/* height (rows) */
+    Tcl_Obj *paddingObj;	/* internal padding */
+
+    Tcl_Obj *showObj;		/* -show list */
+    Tcl_Obj *selectModeObj;	/* -selectmode option */
+
+    Scrollable yscroll;
+    ScrollHandle yscrollHandle;
+
+    /* Derived resources:
+     */
+    Tcl_HashTable columnNames;	/* Map: column name -> column index */
+    int nColumns; 		/* #columns */
+    unsigned showFlags;		/* bitmask of subparts to display */
+
+    TreeColumn **displayColumns; /* List of columns for display (incl tree) */
+    int nDisplayColumns;	/* #display columns */
+    Ttk_Box headingArea;	/* Display area for column headings */
+    Ttk_Box treeArea;   	/* Display area for tree */
+
+} TreePart;
+
+typedef struct {
+    WidgetCore core;
+    TreePart tree;
+} Treeview;
+
+#define USER_MASK 		0x0100
+#define COLUMNS_CHANGED 	(USER_MASK)
+#define DCOLUMNS_CHANGED	(USER_MASK<<1)
+#define SCROLLCMD_CHANGED	(USER_MASK<<2)
+#define SHOW_CHANGED 		(USER_MASK<<3)
+
+static const char *SelectModeStrings[] = { "none", "browse", "extended", NULL };
+
+static Tk_OptionSpec TreeviewOptionSpecs[] =
+{
+    WIDGET_TAKES_FOCUS,
+
+    {TK_OPTION_STRING, "-columns", "columns", "Columns",
+	"", Tk_Offset(Treeview,tree.columnsObj), -1,
+	0,0,COLUMNS_CHANGED | GEOMETRY_CHANGED /*| READONLY_OPTION*/ },
+    {TK_OPTION_STRING, "-displaycolumns","displayColumns","DisplayColumns",
+	"", Tk_Offset(Treeview,tree.displayColumnsObj), -1,
+	0,0,DCOLUMNS_CHANGED | GEOMETRY_CHANGED },
+    {TK_OPTION_STRING, "-show", "show", "Show",
+	DEFAULT_SHOW, Tk_Offset(Treeview,tree.showObj), -1,
+	0,0,SHOW_CHANGED | GEOMETRY_CHANGED },
+
+    {TK_OPTION_STRING_TABLE, "-selectmode", "selectMode", "SelectMode",
+	"extended", Tk_Offset(Treeview,tree.selectModeObj), -1,
+	0,(ClientData)SelectModeStrings,0 },
+
+    {TK_OPTION_PIXELS, "-height", "height", "Height",
+	DEF_TREE_ROWS, Tk_Offset(Treeview,tree.heightObj), -1,
+	0,0,GEOMETRY_CHANGED},
+    {TK_OPTION_STRING, "-padding", "padding", "Pad",
+	DEF_TREE_PADDING, Tk_Offset(Treeview,tree.paddingObj), -1,
+	TK_OPTION_NULL_OK,0,GEOMETRY_CHANGED },
+
+    {TK_OPTION_STRING, "-yscrollcommand", "yScrollCommand", "ScrollCommand",
+	NULL, -1, Tk_Offset(Treeview, tree.yscroll.scrollCmd),
+	TK_OPTION_NULL_OK, 0, SCROLLCMD_CHANGED},
+
+    WIDGET_INHERIT_OPTIONS(CoreOptionSpecs)
+};
+
+/*------------------------------------------------------------------------
+ * +++ Utilities.
+ */
+typedef void (*HashEntryIterator)(void *hashValue);
+
+static void foreachHashEntry(Tcl_HashTable *ht, HashEntryIterator func)
+{
+    Tcl_HashSearch search;
+    Tcl_HashEntry *entryPtr = Tcl_FirstHashEntry(ht, &search);
+    while (entryPtr != NULL) {
+	func(Tcl_GetHashValue(entryPtr));
+	entryPtr = Tcl_NextHashEntry(&search);
+    }
+}
+
+/* + unshare(objPtr) --
+ * 	Ensure that a Tcl_Obj * has refcount 1 -- either return objPtr
+ * 	itself,	or a duplicated copy.
+ */
+static Tcl_Obj *unshare(Tcl_Obj *objPtr)
+{
+    if (Tcl_IsShared(objPtr)) {
+	Tcl_Obj *newObj = Tcl_DuplicateObj(objPtr);
+	Tcl_DecrRefCount(objPtr);
+	Tcl_IncrRefCount(newObj);
+	return newObj;
+    }
+    return objPtr;
+}
+
+/* DisplayLayout --
+ * 	Rebind, place, and draw a layout + object combination.
+ */
+static void DisplayLayout(
+    Ttk_Layout layout, void *recordPtr, Ttk_State state, Ttk_Box b, Drawable d)
+{
+    Ttk_RebindSublayout(layout, recordPtr);
+    Ttk_PlaceLayout(layout, state, b);
+    Ttk_DrawLayout(layout, state, d);
+}
+
+/* + ColumnIndex --
+ * 	Maps column identifier to column index.
+ * 	Returns: -1 if not found, column index otherwise.
+ * 	Leaves an error message in interp->result on error.
+ *
+ * Column IDs may be specified by name or as a number.
+ */
+static int ColumnIndex(Tcl_Interp *interp, Treeview *tv, Tcl_Obj *columnIDObj)
+{
+    Tcl_HashEntry *entryPtr;
+    int columnIndex;
+
+    /* Check for named column:
+     */
+    entryPtr = Tcl_FindHashEntry(
+	    &tv->tree.columnNames, Tcl_GetString(columnIDObj));
+    if (entryPtr) {
+	return (int)Tcl_GetHashValue(entryPtr);
+    }
+
+    /* Check for number:
+     */
+    if (Tcl_GetIntFromObj(NULL, columnIDObj, &columnIndex) == TCL_OK) {
+	if (columnIndex < 0 || columnIndex >= tv->tree.nColumns) {
+	    Tcl_ResetResult(interp);
+	    Tcl_AppendResult(interp,
+		    "Column index ",
+		    Tcl_GetString(columnIDObj),
+		    " out of bounds",
+		    NULL);
+	    return -1;
+	}
+
+	return columnIndex;
+    }
+    Tcl_ResetResult(interp);
+    Tcl_AppendResult(interp,
+	"Invalid column index ", Tcl_GetString(columnIDObj),
+	NULL);
+    return -1;
+}
+
+/* + FindItem --
+ * 	Locates the item with the specified identifier in the tree.
+ * 	If there is no such item, leaves an error message in interp.
+ */
+static TreeItem *FindItem(
+    Tcl_Interp *interp, Treeview *tv, Tcl_Obj *itemNameObj)
+{
+    const char *itemName = Tcl_GetString(itemNameObj);
+    Tcl_HashEntry *entryPtr =  Tcl_FindHashEntry(&tv->tree.items, itemName);
+
+    if (!entryPtr) {
+	Tcl_ResetResult(interp);
+	Tcl_AppendResult(interp, "Item ", itemName, " not found", NULL);
+	return 0;
+    }
+    return (TreeItem*)Tcl_GetHashValue(entryPtr);
+}
+
+/* + GetItemListFromObj --
+ * 	Parse a Tcl_Obj * as a list of items.
+ * 	Returns a NULL-terminated array of items; result must
+ * 	be ckfree()d. On error, returns NULL and leaves an error
+ * 	message in interp.
+ */
+
+static TreeItem **GetItemListFromObj(
+    Tcl_Interp *interp, Treeview *tv, Tcl_Obj *objPtr)
+{
+    TreeItem **items;
+    Tcl_Obj **elements;
+    int i, nElements;
+
+    if (Tcl_ListObjGetElements(interp,objPtr,&nElements,&elements) != TCL_OK) {
+	return NULL;
+    }
+
+    items = (TreeItem**)ckalloc((nElements + 1)*sizeof(TreeItem*));
+    for (i = 0; i < nElements; ++i) {
+	items[i] = FindItem(interp, tv, elements[i]);
+	if (!items[i]) {
+	    ckfree((ClientData)items);
+	    return NULL;
+	}
+    }
+    items[i] = NULL;
+    return items;
+}
+
+/* + ItemName --
+ * 	Returns the item's ID.
+ */
+static const char *ItemName(Treeview *tv, TreeItem *item)
+{
+    return Tcl_GetHashKey(&tv->tree.items, item->entryPtr);
+}
+
+/* + ItemID --
+ * 	Returns a fresh Tcl_Obj * (refcount 0) holding the
+ * 	item identifier of the specified item.
+ */
+static Tcl_Obj *ItemID(Treeview *tv, TreeItem *item)
+{
+    return Tcl_NewStringObj(ItemName(tv, item), -1);
+}
+
+/* + FindColumn --
+ */
+static TreeColumn *FindColumn(
+    Tcl_Interp *interp, Treeview *tv, Tcl_Obj *columnIDObj)
+{
+    int column;
+
+    if (sscanf(Tcl_GetString(columnIDObj), "#%d", &column) == 1)
+    {	/* Display column specification, #n */
+	if (column >= 0 && column < tv->tree.nDisplayColumns) {
+	    return tv->tree.displayColumns[column];
+	}
+	/* else */
+	Tcl_ResetResult(interp);
+	Tcl_AppendResult(interp,
+	    "Column ", Tcl_GetString(columnIDObj), " out of range",
+	    NULL);
+	return NULL;
+    }
+
+    column = ColumnIndex(interp, tv, columnIDObj);
+    if (column >= 0)
+	return tv->tree.columns + column;
+    return 0;
+}
+
+/*------------------------------------------------------------------------
+ * +++ Column configuration.
+ */
+
+/* + TreeviewFreeColumns --
+ * 	Free column data.
+ */
+static void TreeviewFreeColumns(Treeview *tv)
+{
+    int i;
+
+    Tcl_DeleteHashTable(&tv->tree.columnNames);
+    Tcl_InitHashTable(&tv->tree.columnNames, TCL_STRING_KEYS);
+
+    if (tv->tree.columns) {
+	for (i = 0; i < tv->tree.nColumns; ++i)
+	    FreeColumn(tv->tree.columns + i);
+	ckfree((ClientData)tv->tree.columns);
+	tv->tree.columns = 0;
+    }
+}
+
+/* + TreeviewInitColumns --
+ *	Initialize column data when -columns changes.
+ *	Returns: TCL_OK or TCL_ERROR;
+ */
+static int TreeviewInitColumns(Tcl_Interp *interp, Treeview *tv)
+{
+    Tcl_Obj **columns;
+    int i, ncols;
+
+    if (Tcl_ListObjGetElements(
+	    interp, tv->tree.columnsObj, &ncols, &columns) != TCL_OK)
+    {
+	return TCL_ERROR;
+    }
+
+    /*
+     * Free old values:
+     */
+    TreeviewFreeColumns(tv);
+
+    /*
+     * Initialize columns array and columnNames hash table:
+     */
+    tv->tree.nColumns = ncols;
+    tv->tree.columns =
+	(TreeColumn*)ckalloc(tv->tree.nColumns * sizeof(TreeColumn));
+
+    for (i = 0; i < ncols; ++i) {
+	int isNew;
+	Tcl_Obj *columnName = Tcl_DuplicateObj(columns[i]);
+
+	Tcl_HashEntry *entryPtr = Tcl_CreateHashEntry(
+	    &tv->tree.columnNames, Tcl_GetString(columnName), &isNew);
+	Tcl_SetHashValue(entryPtr, i);
+
+	InitColumn(tv->tree.columns + i);
+	Tk_InitOptions(
+	    interp, (ClientData)(tv->tree.columns + i),
+	    tv->tree.columnOptionTable, tv->core.tkwin);
+	Tk_InitOptions(
+	    interp, (ClientData)(tv->tree.columns + i),
+	    tv->tree.headingOptionTable, tv->core.tkwin);
+	Tcl_IncrRefCount(columnName);
+	tv->tree.columns[i].idObj = columnName;
+    }
+
+    return TCL_OK;
+}
+
+/* + TreeviewInitDisplayColumns --
+ * 	Initializes the 'displayColumns' array.
+ *
+ * 	Note that displayColumns[0] is always the tree column,
+ * 	even when SHOW_TREE is not set.
+ *
+ * @@@ TODO: disallow duplicated columns
+ */
+static int TreeviewInitDisplayColumns(Tcl_Interp *interp, Treeview *tv)
+{
+    Tcl_Obj **dcolumns;
+    int index, ndcols;
+    TreeColumn **displayColumns = 0;
+
+    if (Tcl_ListObjGetElements(interp,
+	    tv->tree.displayColumnsObj, &ndcols, &dcolumns) != TCL_OK) {
+	return TCL_ERROR;
+    }
+
+    if (ndcols == 0) {
+	ndcols = tv->tree.nColumns;
+	displayColumns = (TreeColumn**)ckalloc((ndcols+1)*sizeof(TreeColumn*));
+	for (index = 0; index < ndcols; ++index) {
+	    displayColumns[index+1] = tv->tree.columns + index;
+	}
+    } else {
+	displayColumns = (TreeColumn**)ckalloc((ndcols+1)*sizeof(TreeColumn*));
+	for (index = 0; index < ndcols; ++index) {
+	    int columnIndex = ColumnIndex(interp, tv, dcolumns[index]);
+	    if (columnIndex == -1) {
+		ckfree((ClientData)displayColumns);
+		return TCL_ERROR;
+	    }
+	    displayColumns[index+1] = tv->tree.columns + columnIndex;
+	}
+    }
+    displayColumns[0] = &tv->tree.column0;
+
+    if (tv->tree.displayColumns)
+	ckfree((ClientData)tv->tree.displayColumns);
+    tv->tree.displayColumns = displayColumns;
+    tv->tree.nDisplayColumns = ndcols + 1;
+
+    return TCL_OK;
+}
+
+/*------------------------------------------------------------------------
+ * +++ Event handlers.
+ */
+
+static TreeItem *IdentifyItem(Treeview *tv,int y,Ttk_Box *itemPos); /*forward*/
+
+const unsigned int TreeviewBindEventMask =
+      KeyPressMask|KeyReleaseMask
+    | ButtonPressMask|ButtonReleaseMask
+    | PointerMotionMask|ButtonMotionMask
+    | VirtualEventMask
+    ;
+
+static void TreeviewBindEventProc(void *clientData, XEvent *event)
+{
+    Treeview *tv = clientData;
+    TreeItem *item = NULL;
+    Ttk_Box unused;
+    void *taglist;
+    int nTags;
+
+    /*
+     * Figure out where to deliver the event.
+     */
+
+    switch (event->type) 
+    {
+	case KeyPress:
+	case KeyRelease:
+	case VirtualEvent:
+	    item = tv->tree.focus;
+	    break;
+	case ButtonPress:
+	case ButtonRelease:
+	    item = IdentifyItem(tv, event->xbutton.y, &unused);
+	    break;
+	case MotionNotify:
+	    item = IdentifyItem(tv, event->xmotion.y, &unused);
+	    break;
+	default:
+	    break;
+    }
+
+    if (!item) {
+	return;
+    }
+
+    /* ASSERT: Ttk_GetTagListFromObj returns TCL_OK. */
+    Ttk_GetTagListFromObj(NULL, tv->tree.tagTable, item->tagsObj,
+	    &nTags, &taglist);
+
+    /*
+     * Fire binding:
+     */
+    Tcl_Preserve(clientData);
+    Tk_BindEvent(tv->tree.bindingTable, event, tv->core.tkwin, nTags, taglist);
+    Tcl_Release(clientData);
+
+    Ttk_FreeTagList(taglist);
+}
+
+/*------------------------------------------------------------------------
+ * +++ Initialization and cleanup.
+ */
+
+static int TreeviewInitialize(Tcl_Interp *interp, void *recordPtr)
+{
+    Treeview *tv = recordPtr;
+    int unused;
+
+    tv->tree.itemOptionTable =
+	Tk_CreateOptionTable(interp, ItemOptionSpecs);
+    tv->tree.columnOptionTable =
+	Tk_CreateOptionTable(interp, ColumnOptionSpecs);
+    tv->tree.headingOptionTable =
+	Tk_CreateOptionTable(interp, HeadingOptionSpecs);
+    tv->tree.tagOptionTable =
+	Tk_CreateOptionTable(interp, TagOptionSpecs);
+
+    tv->tree.tagTable = Ttk_CreateTagTable(
+	tv->tree.tagOptionTable, sizeof(DisplayItem));
+    tv->tree.bindingTable = Tk_CreateBindingTable(interp);
+    Tk_CreateEventHandler(tv->core.tkwin,
+	TreeviewBindEventMask, TreeviewBindEventProc, tv);
+
+    tv->tree.itemLayout
+	= tv->tree.cellLayout
+	= tv->tree.headingLayout
+	= tv->tree.rowLayout
+	= 0;
+
+    Tcl_InitHashTable(&tv->tree.columnNames, TCL_STRING_KEYS);
+    tv->tree.nColumns = tv->tree.nDisplayColumns = 0;
+    tv->tree.columns = NULL;
+    tv->tree.displayColumns = NULL;
+    tv->tree.showFlags = ~0;
+
+    InitColumn(&tv->tree.column0);
+    Tk_InitOptions(
+	interp, (ClientData)(&tv->tree.column0),
+	tv->tree.columnOptionTable, tv->core.tkwin);
+    Tk_InitOptions(
+	interp, (ClientData)(&tv->tree.column0),
+	tv->tree.headingOptionTable, tv->core.tkwin);
+
+    Tcl_InitHashTable(&tv->tree.items, TCL_STRING_KEYS);
+    tv->tree.serial = 0;
+
+    tv->tree.focus = 0;
+
+    /* Create root item "":
+     */
+    tv->tree.root = NewItem();
+    Tk_InitOptions(interp, (ClientData)tv->tree.root,
+	tv->tree.itemOptionTable, tv->core.tkwin);
+    tv->tree.root->entryPtr = Tcl_CreateHashEntry(&tv->tree.items, "", &unused);
+    Tcl_SetHashValue(tv->tree.root->entryPtr, tv->tree.root);
+
+    /* Scroll handles:
+     */
+    tv->tree.yscrollHandle = CreateScrollHandle(&tv->core, &tv->tree.yscroll);
+
+    return TCL_OK;
+}
+
+static void TreeviewCleanup(void *recordPtr)
+{
+    Treeview *tv = recordPtr;
+
+    Tk_DeleteEventHandler(tv->core.tkwin,
+	    TreeviewBindEventMask,  TreeviewBindEventProc, tv);
+    Tk_DeleteBindingTable(tv->tree.bindingTable);
+    Ttk_DeleteTagTable(tv->tree.tagTable);
+
+    if (tv->tree.itemLayout) Ttk_FreeLayout(tv->tree.itemLayout);
+    if (tv->tree.cellLayout) Ttk_FreeLayout(tv->tree.cellLayout);
+    if (tv->tree.headingLayout) Ttk_FreeLayout(tv->tree.headingLayout);
+    if (tv->tree.rowLayout) Ttk_FreeLayout(tv->tree.rowLayout);
+
+    TreeviewFreeColumns(tv);
+
+    if (tv->tree.displayColumns)
+	Tcl_Free((ClientData)tv->tree.displayColumns);
+
+    foreachHashEntry(&tv->tree.items, FreeItemCB);
+    Tcl_DeleteHashTable(&tv->tree.items);
+
+    FreeScrollHandle(tv->tree.yscrollHandle);
+}
+
+/* + TreeviewConfigure --
+ * 	Configuration widget hook.
+ *
+ * 	BUG: If user sets -columns and -displaycolumns, but -displaycolumns
+ * 	has an error, the widget is left in an inconsistent state.
+ */
+static int
+TreeviewConfigure(Tcl_Interp *interp, void *recordPtr, int mask)
+{
+    Treeview *tv = recordPtr;
+    unsigned showFlags = tv->tree.showFlags;
+
+    if (mask & COLUMNS_CHANGED) {
+	if (TreeviewInitColumns(interp, tv) != TCL_OK)
+	    return TCL_ERROR;
+	mask |= DCOLUMNS_CHANGED;
+    }
+    if (mask & DCOLUMNS_CHANGED) {
+	if (TreeviewInitDisplayColumns(interp, tv) != TCL_OK)
+	    return TCL_ERROR;
+    }
+    if (mask & SCROLLCMD_CHANGED) {
+	ScrollbarUpdateRequired(tv->tree.yscrollHandle);
+    }
+
+    if (  (mask & SHOW_CHANGED)
+	&& GetEnumSetFromObj(
+		    interp,tv->tree.showObj,showStrings,&showFlags) != TCL_OK)
+    {
+	return TCL_ERROR;
+    }
+
+    if (CoreConfigure(interp, recordPtr, mask) != TCL_OK) {
+	return TCL_ERROR;
+    }
+
+    tv->tree.showFlags = showFlags;
+    return TCL_OK;
+}
+
+/* + ConfigureItem --
+ * 	Set item options.
+ */
+static int ConfigureItem(
+    Tcl_Interp *interp, Treeview *tv, TreeItem *item,
+    int objc, Tcl_Obj *const objv[])
+{
+    Tk_SavedOptions savedOptions;
+
+    if (Tk_SetOptions(interp, (ClientData)item, tv->tree.itemOptionTable,
+		objc, objv, tv->core.tkwin,&savedOptions,0) != TCL_OK)
+    {
+	return TCL_ERROR;
+    }
+
+    /* Make sure that -values is a valid list:
+     */
+    if (item->valuesObj) {
+	int unused;
+	if (Tcl_ListObjLength(interp, item->valuesObj, &unused) != TCL_OK)
+	    goto error;
+    }
+
+    /* Validate -image option.
+     * @@@ TODO: keep images array around
+     */
+    if (item->imageObj) {
+	Tk_Image *images = NULL;
+	if (GetImageList(interp, &tv->core, item->imageObj, &images) != TCL_OK)
+	    goto error;
+	if (images)
+	    FreeImageList(images);
+    }
+
+    /* Keep TTK_STATE_OPEN flag in sync with item->openObj.
+     * We use both a state flag and a Tcl_Obj* resource so elements
+     * can access the value in either way.
+     */
+    if (item->openObj) {
+	int isOpen;
+	if (Tcl_GetBooleanFromObj(interp, item->openObj, &isOpen) != TCL_OK)
+	    goto error;
+	if (isOpen)
+	    item->state |= TTK_STATE_OPEN;
+	else
+	    item->state &= ~TTK_STATE_OPEN;
+    }
+
+    /* Make sure -tags is a valid list
+     * (side effect: may create new tags)
+     */
+    if (item->tagsObj) {
+	void *taglist;
+	int nTags;
+	if (Ttk_GetTagListFromObj(interp, tv->tree.tagTable, item->tagsObj,
+		    &nTags, &taglist) != TCL_OK)
+	{
+	    goto error;
+	}
+	Ttk_FreeTagList(taglist);
+    }
+
+    /* All OK.
+     */
+    Tk_FreeSavedOptions(&savedOptions);
+    TtkRedisplayWidget(&tv->core);
+    return TCL_OK;
+
+error:
+    Tk_RestoreSavedOptions(&savedOptions);
+    return TCL_ERROR;
+}
+
+/* + ConfigureColumn --
+ * 	Set column options.
+ */
+static int ConfigureColumn(
+    Tcl_Interp *interp, Treeview *tv, TreeColumn *column,
+    int objc, Tcl_Obj *const objv[])
+{
+    Tk_SavedOptions savedOptions;
+    int mask;
+
+    if (Tk_SetOptions(interp, (ClientData)column,
+	    tv->tree.columnOptionTable, objc, objv, tv->core.tkwin,
+	    &savedOptions,&mask) != TCL_OK)
+    {
+	return TCL_ERROR;
+    }
+
+    if (mask & READONLY_OPTION) {
+	Tcl_ResetResult(interp);
+	Tcl_AppendResult(interp, "Attempt to change read-only option", NULL);
+	goto error;
+    }
+
+    /* Propagate column width changes to overall widget request width,
+     * but only if the widget is currently unmapped, in order to prevent
+     * geometry jumping during interactive column resize.
+     */
+    if (mask & GEOMETRY_CHANGED && !Tk_IsMapped(tv->core.tkwin)) {
+	TtkResizeWidget(&tv->core);
+    }
+    TtkRedisplayWidget(&tv->core);
+
+    Tk_FreeSavedOptions(&savedOptions);
+    return TCL_OK;
+
+error:
+    Tk_RestoreSavedOptions(&savedOptions);
+    return TCL_ERROR;
+}
+
+/* + ConfigureHeading --
+ * 	Set heading options.
+ */
+static int ConfigureHeading(
+    Tcl_Interp *interp, Treeview *tv, TreeColumn *column,
+    int objc, Tcl_Obj *const objv[])
+{
+    Tk_SavedOptions savedOptions;
+    int mask;
+
+    if (Tk_SetOptions(interp, (ClientData)column,
+	    tv->tree.headingOptionTable, objc, objv, tv->core.tkwin,
+	    &savedOptions,&mask) != TCL_OK)
+    {
+	return TCL_ERROR;
+    }
+
+    /* @@@ testing ... */
+    if ((mask & STATE_CHANGED) && column->headingStateObj) {
+	Ttk_StateSpec stateSpec;
+	if (Ttk_GetStateSpecFromObj(
+		interp, column->headingStateObj, &stateSpec) != TCL_OK)
+	{
+	    goto error;
+	}
+	column->headingState = Ttk_ModifyState(column->headingState,&stateSpec);
+	Tcl_DecrRefCount(column->headingStateObj);
+	column->headingStateObj = Ttk_NewStateSpecObj(column->headingState,0);
+	Tcl_IncrRefCount(column->headingStateObj);
+    }
+
+    TtkRedisplayWidget(&tv->core);
+    Tk_FreeSavedOptions(&savedOptions);
+    return TCL_OK;
+
+error:
+    Tk_RestoreSavedOptions(&savedOptions);
+    return TCL_ERROR;
+}
+
+/*------------------------------------------------------------------------
+ * +++ Geometry routines.
+ */
+
+/* + CountRows --
+ * 	Count the number of viewable items.
+ */
+static int CountRows(TreeItem *item)
+{
+    int height = 1;
+
+    if (item->state & TTK_STATE_OPEN) {
+	TreeItem *child = item->children;
+	while (child) {
+	    height += CountRows(child);
+	    child = child->next;
+	}
+    }
+    return height;
+}
+
+/* + TreeWidth --
+ * 	Compute the requested tree width from the sum of visible column widths.
+ */
+static int TreeWidth(Treeview *tv)
+{
+    int i = (tv->tree.showFlags&SHOW_TREE) ? 0 : 1;
+    int width = 0;
+
+    while (i < tv->tree.nDisplayColumns) {
+	width += tv->tree.displayColumns[i++]->width;
+    }
+    return width;
+}
+
+/* + PlaceColumns -
+ * 	Adjust final column width to fill available space.
+ * 	@@@ NB: still not right -- see paned.c for correct algorithm
+ */
+static void PlaceColumns(Treeview *tv, int availableWidth)
+{
+#   define MIN_WIDTH 24
+    int colno = (tv->tree.showFlags & SHOW_TREE) ? 0 : 1;
+    TreeColumn *column = tv->tree.displayColumns[colno];
+
+    while (++colno < tv->tree.nDisplayColumns) {
+	availableWidth -= column->width;
+	column = tv->tree.displayColumns[colno];
+    }
+    column->width = availableWidth;
+    if (column->width < MIN_WIDTH) {
+	column->width = MIN_WIDTH;
+    }
+}
+
+/* + IdentifyRow --
+ * 	Recursive search for item at specified y position.
+ * 	Main work routine for IdentifyItem(()
+ */
+static TreeItem *IdentifyRow(
+    TreeItem *item, 	/* where to start search */
+    Ttk_Box *bp,	/* Scan position */
+    int y)		/* target y coordinate */
+{
+    while (item) {
+	int next_ypos = bp->y + ROWHEIGHT;
+	if (bp->y <= y && y <= next_ypos) {
+	    bp->height = ROWHEIGHT;
+	    return item;
+	}
+	bp->y = next_ypos;
+	if (item->state & TTK_STATE_OPEN) {
+	    TreeItem *subitem = IdentifyRow(item->children, bp, y);
+	    if (subitem) {
+		bp->x += INDENT;
+		bp->width -= INDENT;
+		return subitem;
+	    }
+	}
+	item = item->next;
+    }
+    return 0;
+}
+
+/* + IdentifyItem --
+ * 	Locate the item at the specified y position, if any.
+ * 	On return, *itemPos holds the parcel of the tree item.
+ */
+static TreeItem *IdentifyItem(Treeview *tv, int y, Ttk_Box *itemPos)
+{
+    *itemPos = Ttk_MakeBox(
+		    tv->tree.treeArea.x,
+		    tv->tree.treeArea.y - tv->tree.yscroll.first * ROWHEIGHT,
+		    tv->tree.column0.width,
+		    ROWHEIGHT);
+    return IdentifyRow(tv->tree.root->children, itemPos, y);
+}
+
+/* + IdentifyDisplayColumn --
+ * 	Returns the display column number at the specified x position,
+ * 	or -1 if x is outside any columns.
+ */
+static int IdentifyDisplayColumn(Treeview *tv, int x, int *x1)
+{
+    int colno = (tv->tree.showFlags & SHOW_TREE) ? 0 : 1;
+    int xpos = tv->tree.treeArea.x;
+
+    while (colno < tv->tree.nDisplayColumns) {
+	TreeColumn *column = tv->tree.displayColumns[colno];
+	int next_xpos = xpos + column->width;
+	if (xpos <= x && x <= next_xpos + HALO) {
+	    *x1 = next_xpos;
+	    return colno;
+	}
+	++colno;
+	xpos = next_xpos;
+    }
+
+    return -1;
+}
+
+/* + SubtreeHeight --
+ * 	Returns the height of the visible subtree rooted at item.
+ */
+#define ItemHeight(item) (ROWHEIGHT)	/* TBFIXED */
+static int SubtreeHeight(TreeItem *item)
+{
+    int height = ItemHeight(item);
+    if (item->state & TTK_STATE_OPEN) {
+	TreeItem *child = item->children;
+	while (child) {
+	    height += SubtreeHeight(child);
+	    child = child->next;
+	}
+    }
+    return height;
+}
+
+/* + ItemYPosition --
+ * 	Returns Y position of specified item relative to root of tree,
+ * 	-1 if item is not viewable.
+ */
+static int ItemYPosition(Treeview *tv, TreeItem *p)
+{
+    TreeItem *root = tv->tree.root;
+    int ypos = 0;
+
+    for (;;) {
+	if (p->prev) {
+	    p = p->prev;
+	    ypos += SubtreeHeight(p);
+	} else {
+	    p = p->parent;
+	    if (!(p && (p->state & TTK_STATE_OPEN))) {
+		/* detached or closed ancestor */
+		return -1;
+	    }
+	    if (p == root) {
+		return ypos;
+	    }
+	    ypos += ItemHeight(p);
+	}
+    }
+}
+
+/*------------------------------------------------------------------------
+ * +++ Display routines.
+ */
+
+/* + GetSublayout --
+ * 	Utility routine; acquires a sublayout for items, cells, etc.
+ */
+static Ttk_Layout GetSublayout(
+    Tcl_Interp *interp,
+    Ttk_Theme themePtr,
+    Ttk_Layout parentLayout,
+    const char *layoutName,
+    Tk_OptionTable optionTable,
+    Ttk_Layout *layoutPtr)
+{
+    Ttk_Layout newLayout = Ttk_CreateSublayout(
+	    interp, themePtr, parentLayout, layoutName, optionTable);
+
+    if (newLayout) {
+	if (*layoutPtr)
+	    Ttk_FreeLayout(*layoutPtr);
+	*layoutPtr = newLayout;
+    }
+    return newLayout;
+}
+
+/* + TreeviewGetLayout --
+ * 	GetLayout() widget hook.
+ */
+static Ttk_Layout TreeviewGetLayout(
+    Tcl_Interp *interp, Ttk_Theme themePtr, void *recordPtr)
+{
+    Treeview *tv = recordPtr;
+    Ttk_Layout treeLayout = WidgetGetLayout(interp, themePtr, recordPtr);
+
+    if (!(
+	GetSublayout(interp, themePtr, treeLayout, ".Item",
+	    tv->tree.itemOptionTable, &tv->tree.itemLayout)
+     && GetSublayout(interp, themePtr, treeLayout, ".Cell",
+	    tv->tree.tagOptionTable, &tv->tree.cellLayout)	/*@@@HERE*/
+     && GetSublayout(interp, themePtr, treeLayout, ".Heading",
+	    tv->tree.headingOptionTable, &tv->tree.headingLayout)
+     && GetSublayout(interp, themePtr, treeLayout, ".Row",
+	    tv->tree.tagOptionTable, &tv->tree.rowLayout)	/*@@@HERE*/
+    )) {
+	return 0;
+    }
+
+    return treeLayout;
+}
+
+/* + TreeviewDoLayout --
+ * 	DoLayout() widget hook.  Computes widget layout.
+ *
+ * Side effects:
+ * 	Computes headingArea and treeArea.
+ * 	Computes subtree height.
+ * 	Invokes scroll callbacks.
+ */
+static void TreeviewDoLayout(void *clientData)
+{
+    Treeview *tv = clientData;
+    unsigned showFlags = tv->tree.showFlags;
+    Ttk_LayoutNode *clientNode = Ttk_LayoutFindNode(tv->core.layout, "client");
+
+    Ttk_PlaceLayout(tv->core.layout,tv->core.state,Ttk_WinBox(tv->core.tkwin));
+    tv->tree.treeArea = clientNode
+	? Ttk_LayoutNodeInternalParcel(tv->core.layout,clientNode)
+	: Ttk_WinBox(tv->core.tkwin) ;
+
+    PlaceColumns(tv, tv->tree.treeArea.width);
+
+    if (showFlags & SHOW_HEADINGS) {
+	tv->tree.headingArea = Ttk_PackBox(
+	    &tv->tree.treeArea, 1, HEADINGHEIGHT, TTK_SIDE_TOP);
+    } else {
+	tv->tree.headingArea = Ttk_MakeBox(0,0,0,0);
+    }
+
+    tv->tree.root->state |= TTK_STATE_OPEN;
+    Scrolled(tv->tree.yscrollHandle,
+	    tv->tree.yscroll.first,
+	    tv->tree.yscroll.first + (tv->tree.treeArea.height / ROWHEIGHT),
+	    CountRows(tv->tree.root) - 1);
+}
+
+/* + TreeviewSize --
+ * 	SizeProc() widget hook.  Size is determined by
+ * 	-height option and column widths.
+ *
+ *  	<<NOTE-SLOP>>: Ought to compute extra width and height
+ *  	by checking the padding of TTK_OPTION_BORDER elements
+ *  	in the layout.  In the meantime, just add some extra for slop.
+ */
+static int TreeviewSize(void *clientData, int *widthPtr, int *heightPtr)
+{
+    Treeview *tv = clientData;
+    int nRows;
+    int slop = 12;	/* NOTE-SLOP */
+
+    Tk_GetPixelsFromObj(NULL,tv->core.tkwin, tv->tree.heightObj, &nRows);
+
+    *widthPtr = TreeWidth(tv) + slop;
+    *heightPtr = slop + ROWHEIGHT * nRows;
+
+    if (tv->tree.showFlags & SHOW_HEADINGS)
+	*heightPtr += HEADINGHEIGHT;
+
+    return 1;
+}
+
+/* + ItemState --
+ * 	Returns the state of the specified item, based
+ * 	on widget state, item state, and other information.
+ */
+static Ttk_State ItemState(Treeview *tv, TreeItem *item)
+{
+    Ttk_State state = tv->core.state | item->state;
+    if (!item->children)
+	state |= TTK_STATE_LEAF;
+    if (item != tv->tree.focus)
+	state &= ~TTK_STATE_FOCUS;
+    return state;
+}
+
+/* + DrawHeadings --
+ *	Draw tree headings.
+ */
+static void DrawHeadings(Treeview *tv, Drawable d, Ttk_Box b)
+{
+    int i = (tv->tree.showFlags & SHOW_TREE) ? 0 : 1;
+    int x = 0;
+
+    while (i < tv->tree.nDisplayColumns) {
+	TreeColumn *column = tv->tree.displayColumns[i];
+	Ttk_Box parcel = Ttk_MakeBox(b.x+x, b.y, column->width, b.height);
+	DisplayLayout(tv->tree.headingLayout,
+	    column, column->headingState, parcel, d);
+	x += column->width;
+	++i;
+    }
+}
+
+/* + PrepareItem --
+ * 	Fill in a displayItem record from tag settings.
+ */
+static void PrepareItem(Treeview *tv, TreeItem *item, DisplayItem *displayItem)
+{
+    const int nOptions = sizeof(*displayItem)/sizeof(Tcl_Obj*);
+    Tcl_Obj **dest = (Tcl_Obj**)displayItem;
+    Tcl_Obj **objv = NULL;
+    int objc = 0;
+
+    memset(displayItem, 0, sizeof(*displayItem));
+
+    if (   item->tagsObj 
+    	&& Tcl_ListObjGetElements(NULL, item->tagsObj, &objc, &objv) == TCL_OK)
+    {
+	int i, j;
+	for (i=0; i<objc; ++i) {
+	    Ttk_Tag tag = Ttk_GetTagFromObj(tv->tree.tagTable, objv[i]);
+	    Tcl_Obj **tagRecord = Ttk_TagRecord(tag);
+
+	    if (tagRecord) {
+		for (j=0; j<nOptions; ++j) {
+		    if (tagRecord[j] != 0) {
+			dest[j] = tagRecord[j];
+		    }
+		}
+	    }
+	}
+    }
+}
+
+/* + DrawCells --
+ *	Draw data cells for specified item.
+ */
+static void DrawCells(
+    Treeview *tv, TreeItem *item, DisplayItem *displayItem,
+    Drawable d, Ttk_Box b, int x, int y)
+{
+    Ttk_Layout layout = tv->tree.cellLayout;
+    Ttk_State state = ItemState(tv, item);
+    Ttk_Padding cellPadding = {4, 0, 4, 0};
+    int height = ROWHEIGHT;
+    int nValues = 0;
+    Tcl_Obj **values = 0;
+    int i;
+
+    if (!item->valuesObj) {
+	return;
+    }
+
+    Tcl_ListObjGetElements(NULL, item->valuesObj, &nValues, &values);
+    for (i = 0; i < tv->tree.nColumns; ++i) {
+	tv->tree.columns[i].data = (i < nValues) ? values[i] : 0;
+    }
+
+    for (i = 1; i < tv->tree.nDisplayColumns; ++i) {
+	TreeColumn *column = tv->tree.displayColumns[i];
+	Ttk_Box parcel = Ttk_PadBox(
+	    Ttk_MakeBox(b.x+x, b.y+y, column->width, height), cellPadding);
+
+	displayItem->textObj = column->data;
+	displayItem->anchorObj = column->anchorObj;
+
+	DisplayLayout(layout, displayItem, state, parcel, d);
+	x += column->width;
+    }
+}
+
+/* + DrawItem --
+ * 	Draw an item (row background, tree label, and cells).
+ * 	at the specified x, y position.
+ */
+static void DrawItem(
+    Treeview *tv, TreeItem *item, Drawable d, Ttk_Box b, int depth, int row)
+{
+    Ttk_Layout layout = tv->tree.itemLayout;
+    Ttk_State state = ItemState(tv, item);
+    DisplayItem displayItem;
+    int height = ROWHEIGHT;
+    int x = depth * INDENT;
+    int y = (row - tv->tree.yscroll.first) * ROWHEIGHT;
+
+    if (row % 2) state |= TTK_STATE_ALTERNATE;
+
+    PrepareItem(tv, item, &displayItem);
+
+    /* Draw row background:
+     */
+    {
+	Ttk_Box rowBox = Ttk_MakeBox(b.x, b.y+y, TreeWidth(tv), height);
+	DisplayLayout(tv->tree.rowLayout, &displayItem, state, rowBox, d);
+    }
+
+    /* Draw tree label:
+     */
+    if (tv->tree.showFlags & SHOW_TREE) {
+	int colwidth = tv->tree.column0.width;
+	Ttk_Box parcel = Ttk_MakeBox(b.x + x, b.y + y, colwidth - x, height);
+	DisplayLayout(layout, item, state, parcel, d);
+	x = colwidth;
+    } else {
+	x = 0;
+    }
+
+    /* Draw data cells:
+     */
+    DrawCells(tv, item, &displayItem, d, b, x, y);
+}
+
+/* + DrawSubtree --
+ * 	Draw an item and all of its (viewable) descendants.
+ *
+ * Returns:
+ * 	Row number of the last item drawn.
+ */
+
+static int DrawForest(	/* forward */
+    Treeview *tv, TreeItem *item, Drawable d, Ttk_Box b, int depth, int row);
+
+static int DrawSubtree(
+    Treeview *tv, TreeItem *item, Drawable d, Ttk_Box b, int depth, int row)
+{
+    if (row >= tv->tree.yscroll.first) {
+	DrawItem(tv, item, d, b, depth, row);
+    }
+
+    if (item->state & TTK_STATE_OPEN) {
+	return DrawForest(tv, item->children, d, b, depth + 1, row + 1);
+    } else {
+	return row + 1;
+    }
+}
+
+/* + DrawForest --
+ * 	Draw a sequence of items and their visible descendants.
+ *
+ * Returns:
+ * 	Row number of the last item drawn.
+ */
+static int DrawForest(
+    Treeview *tv, TreeItem *item, Drawable d, Ttk_Box b, int depth, int row)
+{
+    while (item && row <= tv->tree.yscroll.last) {
+        row = DrawSubtree(tv, item, d, b, depth, row);
+	item = item->next;
+    }
+    return row;
+}
+
+/* + TreeviewDisplay --
+ * 	Display() widget hook.  Draw the widget contents.
+ */
+static void TreeviewDisplay(void *clientData, Drawable d)
+{
+    Treeview *tv = clientData;
+
+    Ttk_DrawLayout(tv->core.layout, tv->core.state, d);
+    if (tv->tree.showFlags & SHOW_HEADINGS) {
+	DrawHeadings(tv, d, tv->tree.headingArea);
+    }
+    DrawForest(tv, tv->tree.root->children, d, tv->tree.treeArea, 0,0);
+}
+
+/*------------------------------------------------------------------------
+ * +++ Utilities for widget commands
+ */
+
+/* + InsertPosition --
+ * 	Locate the previous sibling for [$tree insert] and [$tree move].
+ *
+ * 	Returns a pointer to the item just before the specified index,
+ * 	or 0 if the item is to be inserted at the beginning.
+ */
+static TreeItem *InsertPosition(TreeItem *parent, int index)
+{
+    TreeItem *sibling = parent->children;
+    if (sibling) {
+	while (index > 0 && sibling->next) {
+	    sibling = sibling->next;
+	    --index;
+	}
+	if (index <= 0) {
+	    sibling = sibling->prev;
+	} /* else -- $index > #children, insert at end. */
+    }
+    return sibling;
+}
+
+/* + EndPosition --
+ * 	Locate the last child of the specified node.
+ */
+static TreeItem *EndPosition(TreeItem *parent)
+{
+    TreeItem *sibling = parent->children;
+    if (sibling) {
+	while (sibling->next) {
+	    sibling = sibling->next;
+	}
+    }
+    return sibling;
+}
+
+/* + AncestryCheck --
+ * 	Verify that specified item is not an ancestor of the specified parent;
+ * 	returns 1 if OK, 0 and leaves an error message in interp otherwise.
+ */
+static int AncestryCheck(
+    Tcl_Interp *interp, Treeview *tv, TreeItem *item, TreeItem *parent)
+{
+    TreeItem *p = parent;
+    while (p) {
+	if (p == item) {
+	    Tcl_ResetResult(interp);
+	    Tcl_AppendResult(interp,
+		    "Cannot insert ", ItemName(tv, item),
+		    " as a descendant of ", ItemName(tv, parent),
+		    NULL);
+	    return 0;
+	}
+	p = p->parent;
+    }
+    return 1;
+}
+
+/* + DeleteItems --
+ * 	Remove an item and all of its descendants from the hash table
+ * 	and detach them from the tree; returns a linked list (chained
+ * 	along the ->next pointer) of deleted items.
+ */
+static TreeItem *DeleteItems(TreeItem *item, TreeItem *delq)
+{
+    if (item->entryPtr) {
+	DetachItem(item);
+	while (item->children) {
+	    delq = DeleteItems(item->children, delq);
+	}
+	Tcl_DeleteHashEntry(item->entryPtr);
+	item->entryPtr = 0;
+	item->next = delq;
+	delq = item;
+    } /* else -- item has already been unlinked */
+    return delq;
+}
+
+/* + RowNumber --
+ * 	Calculate which row the specified item appears on;
+ * 	returns -1 if the item is not viewable.
+ * 	Xref: DrawForest, IdentifyItem.
+ */
+static int RowNumber(Treeview *tv, TreeItem *item)
+{
+    TreeItem *p = tv->tree.root->children;
+    int n = 0;
+
+    while (p) {
+	if (p == item)
+	    return n;
+
+	++n;
+
+	/* Find next viewable item in preorder traversal order
+	 */
+	if (p->children && (p->state & TTK_STATE_OPEN)) {
+	    p = p->children;
+	} else {
+	    while (!p->next && p && p->parent)
+		p = p->parent;
+	    if (p)
+		p = p->next;
+	}
+    }
+
+    return -1;
+}
+
+/* + ItemDepth -- return the depth of a tree item.
+ * 	The depth of an item is equal to the number of proper ancestors,
+ * 	not counting the root node.
+ */
+static int ItemDepth(TreeItem *item)
+{
+    int depth = 0;
+    while (item->parent) {
+	++depth;
+	item = item->parent;
+    }
+    return depth-1;
+}
+
+/*------------------------------------------------------------------------
+ * +++ Widget commands -- item inquiry.
+ */
+
+/* + $tv children $item ?newchildren? --
+ * 	Return the list of children associated with $item
+ */
+static int TreeviewChildrenCommand(
+    Tcl_Interp *interp, int objc, Tcl_Obj *const objv[], void *recordPtr)
+{
+    Treeview *tv = recordPtr;
+    TreeItem *item;
+    Tcl_Obj *result;
+
+    if (objc < 3 || objc > 4) {
+	Tcl_WrongNumArgs(interp, 2, objv, "item ?newchildren?");
+	return TCL_ERROR;
+    }
+    item = FindItem(interp, tv, objv[2]);
+    if (!item) {
+	return TCL_ERROR;
+    }
+
+    if (objc == 3) {
+	result = Tcl_NewListObj(0,0);
+	for (item = item->children; item; item = item->next) {
+	    Tcl_ListObjAppendElement(interp, result, ItemID(tv, item));
+	}
+	Tcl_SetObjResult(interp, result);
+    } else {
+	TreeItem **newChildren = GetItemListFromObj(interp, tv, objv[3]);
+	TreeItem *child;
+	int i;
+
+	if (!newChildren)
+	    return TCL_ERROR;
+
+	/* Sanity-check:
+	 */
+	for (i=0; newChildren[i]; ++i) {
+	    if (!AncestryCheck(interp, tv, newChildren[i], item)) {
+		ckfree((ClientData)newChildren);
+		return TCL_ERROR;
+	    }
+	}
+
+	/* Detach old children:
+	 */
+	child = item->children;
+	while (child) {
+	    TreeItem *next = child->next;
+	    DetachItem(child);
+	    child = next;
+	}
+
+	/* Detach new children from their current locations:
+	 */
+	for (i=0; newChildren[i]; ++i) {
+	    DetachItem(newChildren[i]);
+	}
+
+	/* Reinsert new children:
+	 * Note: it is not an error for an item to be listed more than once,
+	 * though it probably should be...
+	 */
+	child = 0;
+	for (i=0; newChildren[i]; ++i) {
+	    if (newChildren[i]->parent) {
+		/* This is a duplicate element which has already been
+		 * inserted.  Ignore it.
+		 */
+		continue;
+	    }
+	    InsertItem(item, child, newChildren[i]);
+	    child = newChildren[i];
+	}
+
+	ckfree((ClientData)newChildren);
+	TtkRedisplayWidget(&tv->core);
+    }
+
+    return TCL_OK;
+}
+
+/* + $tv parent $item --
+ * 	Return the item ID of $item's parent.
+ */
+static int TreeviewParentCommand(
+    Tcl_Interp *interp, int objc, Tcl_Obj *const objv[], void *recordPtr)
+{
+    Treeview *tv = recordPtr;
+    TreeItem *item;
+
+    if (objc != 3) {
+	Tcl_WrongNumArgs(interp, 2, objv, "item");
+	return TCL_ERROR;
+    }
+    item = FindItem(interp, tv, objv[2]);
+    if (!item) {
+	return TCL_ERROR;
+    }
+
+    if (item->parent) {
+	Tcl_SetObjResult(interp, ItemID(tv, item->parent));
+    } else {
+	/* This is the root item.  @@@ Return an error? */
+	Tcl_ResetResult(interp);
+    }
+
+    return TCL_OK;
+}
+
+/* + $tv next $item
+ * 	Return the ID of $item's next sibling.
+ */
+static int TreeviewNextCommand(
+    Tcl_Interp *interp, int objc, Tcl_Obj *const objv[], void *recordPtr)
+{
+    Treeview *tv = recordPtr;
+    TreeItem *item;
+
+    if (objc != 3) {
+	Tcl_WrongNumArgs(interp, 2, objv, "item");
+	return TCL_ERROR;
+    }
+    item = FindItem(interp, tv, objv[2]);
+    if (!item) {
+	return TCL_ERROR;
+    }
+
+    if (item->next) {
+	Tcl_SetObjResult(interp, ItemID(tv, item->next));
+    } /* else -- leave interp-result empty */
+
+    return TCL_OK;
+}
+
+/* + $tv prev $item
+ * 	Return the ID of $item's previous sibling.
+ */
+static int TreeviewPrevCommand(
+    Tcl_Interp *interp, int objc, Tcl_Obj *const objv[], void *recordPtr)
+{
+    Treeview *tv = recordPtr;
+    TreeItem *item;
+
+    if (objc != 3) {
+	Tcl_WrongNumArgs(interp, 2, objv, "item");
+	return TCL_ERROR;
+    }
+    item = FindItem(interp, tv, objv[2]);
+    if (!item) {
+	return TCL_ERROR;
+    }
+
+    if (item->prev) {
+	Tcl_SetObjResult(interp, ItemID(tv, item->prev));
+    } /* else -- leave interp-result empty */
+
+    return TCL_OK;
+}
+
+/* + $tv index $item --
+ * 	Return the index of $item within its parent.
+ */
+static int TreeviewIndexCommand(
+    Tcl_Interp *interp, int objc, Tcl_Obj *const objv[], void *recordPtr)
+{
+    Treeview *tv = recordPtr;
+    TreeItem *item;
+    int index = 0;
+
+    if (objc != 3) {
+	Tcl_WrongNumArgs(interp, 2, objv, "item");
+	return TCL_ERROR;
+    }
+    item = FindItem(interp, tv, objv[2]);
+    if (!item) {
+	return TCL_ERROR;
+    }
+
+    while (item->prev) {
+	++index;
+	item = item->prev;
+    }
+
+    Tcl_SetObjResult(interp, Tcl_NewIntObj(index));
+    return TCL_OK;
+}
+
+/* + $tv exists $itemid --
+ * 	Test if the specified item id is present in the tree.
+ */
+static int TreeviewExistsCommand(
+    Tcl_Interp *interp, int objc, Tcl_Obj *const objv[], void *recordPtr)
+{
+    Treeview *tv = recordPtr;
+    Tcl_HashEntry *entryPtr;
+
+    if (objc != 3) {
+	Tcl_WrongNumArgs(interp, 2, objv, "itemid");
+	return TCL_ERROR;
+    }
+
+    entryPtr = Tcl_FindHashEntry(&tv->tree.items, Tcl_GetString(objv[2]));
+    Tcl_SetObjResult(interp, Tcl_NewBooleanObj(entryPtr != 0));
+    return TCL_OK;
+}
+
+/* + $tv bbox $itemid ?$column? --
+ * 	Return bounding box [x y width height] of specified item.
+ */
+static int TreeviewBBoxCommand(
+    Tcl_Interp *interp, int objc, Tcl_Obj *const objv[], void *recordPtr)
+{
+    Treeview *tv = recordPtr;
+    TreeItem *item = 0;
+    TreeColumn *column = 0;
+    int ypos;
+    Ttk_Box bbox;
+
+    if (objc < 3 || objc > 4) {
+	Tcl_WrongNumArgs(interp, 2, objv, "itemid ?column");
+	return TCL_ERROR;
+    }
+
+    item = FindItem(interp, tv, objv[2]);
+    if (!item) {
+	return TCL_ERROR;
+    }
+    if (objc >=4 && (column = FindColumn(interp,tv,objv[3])) == NULL) {
+	return TCL_ERROR;
+    }
+
+    /* Compute bounding box of item:
+     * ALTERNATE: (RowNumber(tv, item) - tv->tree.yscroll.first) * ROWHEIGHT;
+     */
+    ypos = ItemYPosition(tv, item) - (ROWHEIGHT * tv->tree.yscroll.first);
+    if (ypos < 0 || ypos > tv->tree.treeArea.height) {
+	/* not viewable, or off-screen */
+	return TCL_OK;
+    }
+
+    bbox = tv->tree.treeArea;
+    bbox.y += ypos;
+    bbox.height = ROWHEIGHT;
+
+    /* If column has been specified, compute bounding box of cell
+     */
+    if (column) {
+	int xpos = 0, i = (tv->tree.showFlags & SHOW_TREE) ? 0 : 1;
+	while (i < tv->tree.nDisplayColumns) {
+	    if (tv->tree.displayColumns[i] == column) {
+		break;
+	    }
+	    xpos += tv->tree.displayColumns[i]->width;
+	    ++i;
+	}
+	if (i == tv->tree.nDisplayColumns) { /* specified column unviewable */
+	    return TCL_OK;
+	}
+	bbox.x += xpos;
+	bbox.width = column->width;
+
+	/* Special case for tree column -- account for indentation:
+	 * (@@@ NOTE: doesn't account for tree indicator or image;
+	 *  @@@ this may or may not be the right thing.)
+	 */
+	if (column == &tv->tree.column0) {
+	    int indent = INDENT * ItemDepth(item);
+	    bbox.x += indent;
+	    bbox.width -= indent;
+	}
+    }
+
+    Tcl_SetObjResult(interp, Ttk_NewBoxObj(bbox));
+    return TCL_OK;
+}
+
+/* + $tv identify $x $y -- (obsolescent)
+ * 	Implements the old, horrible, 2-argument form of [$tv identify].
+ *
+ * Returns: one of
+ * 	heading #n
+ * 	cell itemid #n
+ * 	item itemid element
+ * 	row itemid
+ */
+static int TreeviewHorribleIdentify(
+    Tcl_Interp *interp, int objc, Tcl_Obj *const objv[], Treeview *tv)
+{
+    const char *what = "nothing", *detail = NULL;
+    TreeItem *item = 0;
+    Tcl_Obj *result;
+    int dColumnNumber;
+    char dcolbuf[16];
+    int x, y, x1;
+
+    /* ASSERT: objc == 4 */
+
+    if (   Tcl_GetIntFromObj(interp, objv[2], &x) != TCL_OK
+	|| Tcl_GetIntFromObj(interp, objv[3], &y) != TCL_OK
+    ) {
+	return TCL_ERROR;
+    }
+
+    dColumnNumber = IdentifyDisplayColumn(tv, x, &x1);
+    if (dColumnNumber < 0) {
+	goto done;
+    }
+    sprintf(dcolbuf, "#%d", dColumnNumber);
+
+    if (Ttk_BoxContains(tv->tree.headingArea,x,y)) {
+	if (-HALO <= x1 - x  && x1 - x <= HALO) {
+	    what = "separator";
+	} else {
+	    what = "heading";
+	}
+	detail = dcolbuf;
+    } else if (Ttk_BoxContains(tv->tree.treeArea,x,y)) {
+	Ttk_Box itemBox;
+	item = IdentifyItem(tv, y, &itemBox);
+	if (item && dColumnNumber > 0) {
+	    what = "cell";
+	    detail = dcolbuf;
+	} else if (item) {
+	    Ttk_Layout layout = tv->tree.itemLayout;
+	    Ttk_LayoutNode *element;
+	    Ttk_RebindSublayout(layout, item);
+	    Ttk_PlaceLayout(layout, ItemState(tv,item), itemBox);
+	    element = Ttk_LayoutIdentify(layout, x, y);
+
+	    if (element) {
+		what = "item";
+		detail = Ttk_LayoutNodeName(element);
+	    } else {
+		what = "row";
+	    }
+	}
+    }
+
+done:
+    result = Tcl_NewListObj(0,0);
+    Tcl_ListObjAppendElement(NULL, result, Tcl_NewStringObj(what, -1));
+    if (item)
+	Tcl_ListObjAppendElement(NULL, result, ItemID(tv, item));
+    if (detail)
+	Tcl_ListObjAppendElement(NULL, result, Tcl_NewStringObj(detail, -1));
+
+    Tcl_SetObjResult(interp, result);
+    return TCL_OK;
+}
+
+/* + $tv identify $component $x $y --
+ * 	Identify the component at position x,y.
+ */
+
+static int TreeviewIdentifyCommand(
+    Tcl_Interp *interp, int objc, Tcl_Obj *const objv[], void *recordPtr)
+{
+    static const char *componentStrings[] =
+	{ "row", "column", NULL };
+    enum { I_ROW, I_COLUMN };
+
+    Treeview *tv = recordPtr;
+    int component, x, y;
+
+    if (objc == 4) {	/* Old form */
+	return TreeviewHorribleIdentify(interp, objc, objv, tv);
+    } else if (objc != 5) {
+	Tcl_WrongNumArgs(interp, 2, objv, "component x y");
+	return TCL_ERROR;
+    }
+
+    if (   Tcl_GetIndexFromObj(interp, objv[2],
+		componentStrings, "component", TCL_EXACT, &component) != TCL_OK
+        || Tcl_GetIntFromObj(interp, objv[3], &x) != TCL_OK
+	|| Tcl_GetIntFromObj(interp, objv[4], &y) != TCL_OK
+    ) {
+	return TCL_ERROR;
+    }
+
+    switch (component)
+    {
+	case I_ROW :
+	{
+	    Ttk_Box itemBox;
+	    TreeItem *item = IdentifyItem(tv, y, &itemBox);
+	    if (item) {
+		Tcl_SetObjResult(interp, ItemID(tv, item));
+	    }
+	    break;
+	}
+
+	case I_COLUMN :
+	{
+	    int x1;
+	    int column = IdentifyDisplayColumn(tv, x, &x1);
+
+	    if (column >= 0) {
+		char dcolbuf[16];
+		sprintf(dcolbuf, "#%d", column);
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(dcolbuf, -1));
+	    }
+	    break;
+	}
+    }
+    return TCL_OK;
+}
+
+/*------------------------------------------------------------------------
+ * +++ Widget commands -- item and column configuration.
+ */
+
+/* + $tv item $item ?options ....?
+ * 	Query or configure item options.
+ */
+static int TreeviewItemCommand(
+    Tcl_Interp *interp, int objc, Tcl_Obj *const objv[], void *recordPtr)
+{
+    Treeview *tv = recordPtr;
+    TreeItem *item;
+
+    if (objc < 3) {
+	Tcl_WrongNumArgs(interp, 2, objv, "item ?option ?value??...");
+	return TCL_ERROR;
+    }
+    if (!(item = FindItem(interp, tv, objv[2]))) {
+	return TCL_ERROR;
+    }
+
+    if (objc == 3) {
+	return EnumerateOptions(interp, item, ItemOptionSpecs,
+	    tv->tree.itemOptionTable,  tv->core.tkwin);
+    } else if (objc == 4) {
+	return GetOptionValue(interp, item, objv[3],
+	    tv->tree.itemOptionTable, tv->core.tkwin);
+    } else {
+	return ConfigureItem(interp, tv, item, objc-3, objv+3);
+    }
+}
+
+/* + $tv column column ?options ....?
+ * 	Column data accessor
+ */
+static int TreeviewColumnCommand(
+    Tcl_Interp *interp, int objc, Tcl_Obj *const objv[], void *recordPtr)
+{
+    Treeview *tv = recordPtr;
+    TreeColumn *column;
+
+    if (objc < 3) {
+	Tcl_WrongNumArgs(interp, 2, objv, "column -option value...");
+	return TCL_ERROR;
+    }
+    if (!(column = FindColumn(interp, tv, objv[2]))) {
+	return TCL_ERROR;
+    }
+
+    if (objc == 3) {
+	return EnumerateOptions(interp, column, ColumnOptionSpecs,
+	    tv->tree.columnOptionTable, tv->core.tkwin);
+    } else if (objc == 4) {
+	return GetOptionValue(interp, column, objv[3],
+	    tv->tree.columnOptionTable, tv->core.tkwin);
+    } else {
+	return ConfigureColumn(interp, tv, column, objc-3, objv+3);
+    }
+}
+
+/* + $tv heading column ?options ....?
+ * 	Heading data accessor
+ */
+static int TreeviewHeadingCommand(
+    Tcl_Interp *interp, int objc, Tcl_Obj *const objv[], void *recordPtr)
+{
+    Treeview *tv = recordPtr;
+    Tk_OptionTable optionTable = tv->tree.headingOptionTable;
+    Tk_Window tkwin = tv->core.tkwin;
+    TreeColumn *column;
+
+    if (objc < 3) {
+	Tcl_WrongNumArgs(interp, 2, objv, "column -option value...");
+	return TCL_ERROR;
+    }
+    if (!(column = FindColumn(interp, tv, objv[2]))) {
+	return TCL_ERROR;
+    }
+
+    if (objc == 3) {
+	return EnumerateOptions(
+	    interp, column, HeadingOptionSpecs, optionTable, tkwin);
+    } else if (objc == 4) {
+	return GetOptionValue(
+	    interp, column, objv[3], optionTable, tkwin);
+    } else {
+	return ConfigureHeading(interp, tv, column, objc-3,objv+3);
+    }
+}
+
+/* + $tv set $item ?$column ?value??
+ * 	Query or configure cell values
+ */
+static int TreeviewSetCommand(
+    Tcl_Interp *interp, int objc, Tcl_Obj *const objv[], void *recordPtr)
+{
+    Treeview *tv = recordPtr;
+    TreeItem *item;
+    TreeColumn *column;
+    int columnNumber;
+
+    if (objc < 3 || objc > 5) {
+	Tcl_WrongNumArgs(interp, 2, objv, "item ?column ?value??");
+	return TCL_ERROR;
+    }
+    if (!(item = FindItem(interp, tv, objv[2])))
+	return TCL_ERROR;
+
+    /* Make sure -values exists:
+     */
+    if (!item->valuesObj) {
+	item->valuesObj = Tcl_NewListObj(0,0);
+	Tcl_IncrRefCount(item->valuesObj);
+    }
+
+    if (objc == 3) {
+	/* Return dictionary:
+	 */
+	Tcl_Obj *result = Tcl_NewListObj(0,0);
+	Tcl_Obj *value;
+	for (columnNumber=0; columnNumber<tv->tree.nColumns; ++columnNumber) {
+	    Tcl_ListObjIndex(interp, item->valuesObj, columnNumber, &value);
+	    if (value) {
+		Tcl_ListObjAppendElement(interp, result,
+			tv->tree.columns[columnNumber].idObj);
+		Tcl_ListObjAppendElement(interp, result, value);
+	    }
+	}
+	Tcl_SetObjResult(interp, result);
+	return TCL_OK;
+    }
+
+    /* else -- get or set column
+     */
+    if (!(column = FindColumn(interp, tv, objv[3])))
+	return TCL_ERROR;
+
+    if (column == &tv->tree.column0) {
+	/* @@@ Maybe set -text here instead? */
+	Tcl_AppendResult(interp, "Display column #0 cannot be set", NULL);
+	return TCL_ERROR;
+    }
+
+    /* Note: we don't do any error checking in the list operations,
+     * since item->valuesObj is guaranteed to be a list.
+     */
+    columnNumber = column - tv->tree.columns;
+
+    if (objc == 4) {	/* get column */
+	Tcl_Obj *result = 0;
+	Tcl_ListObjIndex(interp, item->valuesObj, columnNumber, &result);
+	if (!result) {
+	    result = Tcl_NewStringObj("",0);
+	}
+	Tcl_SetObjResult(interp, result);
+	return TCL_OK;
+    } else {		/* set column */
+	int length;
+
+	item->valuesObj = unshare(item->valuesObj);
+
+	/* Make sure -values is fully populated:
+	 */
+	Tcl_ListObjLength(interp, item->valuesObj, &length);
+	while (length < tv->tree.nColumns) {
+	    Tcl_Obj *empty = Tcl_NewStringObj("",0);
+	    Tcl_ListObjAppendElement(interp, item->valuesObj, empty);
+	    ++length;
+	}
+
+	/* Set value:
+	 */
+	Tcl_ListObjReplace(interp,item->valuesObj,columnNumber,1,1,objv+4);
+	TtkRedisplayWidget(&tv->core);
+	return TCL_OK;
+    }
+}
+
+/*------------------------------------------------------------------------
+ * +++ Widget commands -- tree modification.
+ */
+
+/* + $tv insert $parent $index ?-id id? ?-option value...?
+ * 	Insert a new item.
+ */
+static int TreeviewInsertCommand(
+    Tcl_Interp *interp, int objc, Tcl_Obj *const objv[], void *recordPtr)
+{
+    Treeview *tv = recordPtr;
+    TreeItem *parent, *sibling, *newItem;
+    Tcl_HashEntry *entryPtr;
+    int isNew;
+
+    if (objc < 4) {
+	Tcl_WrongNumArgs(interp, 2, objv, "parent index ?-id id? -options...");
+	return TCL_ERROR;
+    }
+
+    /* Get parent node:
+     */
+    if ((parent = FindItem(interp, tv, objv[2])) == NULL) {
+	return TCL_ERROR;
+    }
+
+    /* Locate previous sibling based on $index:
+     */
+    if (!strcmp(Tcl_GetString(objv[3]), "end")) {
+	sibling = EndPosition(parent);
+    } else {
+	int index;
+	if (Tcl_GetIntFromObj(interp, objv[3], &index) != TCL_OK)
+	    return TCL_ERROR;
+	sibling = InsertPosition(parent, index);
+    }
+
+    /* Get node name:
+     *     If -id supplied and does not already exist, use that;
+     *     Otherwise autogenerate new one.
+     */
+    objc -= 4; objv += 4;
+    if (objc >= 2 && !strcmp("-id", Tcl_GetString(objv[0]))) {
+	const char *itemName = Tcl_GetString(objv[1]);
+	entryPtr = Tcl_CreateHashEntry(&tv->tree.items, itemName, &isNew);
+	if (!isNew) {
+	    Tcl_AppendResult(interp, "Item ",itemName," already exists",NULL);
+	    return TCL_ERROR;
+	}
+	objc -= 2; objv += 2;
+    } else {
+	char idbuf[16];
+	do {
+	    ++tv->tree.serial;
+	    sprintf(idbuf, "I%03X", tv->tree.serial);
+	    entryPtr = Tcl_CreateHashEntry(&tv->tree.items, idbuf, &isNew);
+	} while (!isNew);
+    }
+
+    /* Create and configure new item:
+     */
+    newItem = NewItem();
+    Tk_InitOptions(
+	interp, (ClientData)newItem, tv->tree.itemOptionTable, tv->core.tkwin);
+    if (ConfigureItem(interp, tv, newItem, objc, objv) != TCL_OK) {
+    	Tcl_DeleteHashEntry(entryPtr);
+	FreeItem(newItem);
+	return TCL_ERROR;
+    }
+
+    /* Store in hash table, link into tree:
+     */
+    Tcl_SetHashValue(entryPtr, newItem);
+    newItem->entryPtr = entryPtr;
+    InsertItem(parent, sibling, newItem);
+    TtkRedisplayWidget(&tv->core);
+
+    Tcl_SetObjResult(interp, ItemID(tv, newItem));
+    return TCL_OK;
+}
+
+/* + $tv detach $item --
+ * 	Unlink $item from the tree.
+ */
+static int TreeviewDetachCommand(
+    Tcl_Interp *interp, int objc, Tcl_Obj *const objv[], void *recordPtr)
+{
+    Treeview *tv = recordPtr;
+    TreeItem **items;
+    int i;
+
+    if (objc != 3) {
+	Tcl_WrongNumArgs(interp, 2, objv, "item");
+	return TCL_ERROR;
+    }
+    if (!(items = GetItemListFromObj(interp, tv, objv[2]))) {
+	return TCL_ERROR;
+    }
+
+    /* Sanity-check */
+    for (i = 0; items[i]; ++i) {
+	if (items[i] == tv->tree.root) {
+	    Tcl_AppendResult(interp, "Cannot detach root item", NULL);
+	    ckfree((ClientData)items);
+	    return TCL_ERROR;
+	}
+    }
+
+    for (i = 0; items[i]; ++i) {
+	DetachItem(items[i]);
+    }
+
+    TtkRedisplayWidget(&tv->core);
+    ckfree((ClientData)items);
+    return TCL_OK;
+}
+
+/* + $tv delete $items --
+ * 	Delete each item in $items.
+ *
+ * 	Do this in two passes:
+ * 	First detach the item and all its descendants and remove them
+ * 	from the hash table.  Free the items themselves in a second pass.
+ *
+ * 	It's done this way because an item may appear more than once
+ *	in the list of items to delete (either directly or as a descendant
+ *	of a previously deleted item.)
+ */
+
+static int TreeviewDeleteCommand(
+    Tcl_Interp *interp, int objc, Tcl_Obj *const objv[], void *recordPtr)
+{
+    Treeview *tv = recordPtr;
+    TreeItem **items, *delq;
+    int i;
+
+    if (objc != 3) {
+	Tcl_WrongNumArgs(interp, 2, objv, "items");
+	return TCL_ERROR;
+    }
+
+    if (!(items = GetItemListFromObj(interp, tv, objv[2]))) {
+	return TCL_ERROR;
+    }
+
+    /* Sanity-check:
+     */
+    for (i=0; items[i]; ++i) {
+	if (items[i] == tv->tree.root) {
+	    ckfree((ClientData)items);
+	    Tcl_AppendResult(interp, "Cannot delete root item", NULL);
+	    return TCL_ERROR;
+	}
+    }
+
+    /* Remove items from hash table.
+     */
+    delq = 0;
+    for (i=0; items[i]; ++i) {
+	delq = DeleteItems(items[i], delq);
+    }
+
+    /* Free items:
+     */
+    while (delq) {
+	TreeItem *next = delq->next;
+	if (tv->tree.focus == delq)
+	    tv->tree.focus = 0;
+	FreeItem(delq);
+	delq = next;
+    }
+
+    ckfree((ClientData)items);
+    TtkRedisplayWidget(&tv->core);
+    return TCL_OK;
+}
+
+/* + $tv move $item $parent $index
+ * 	Move $item to the specified $index in $parent's child list.
+ */
+static int TreeviewMoveCommand(
+    Tcl_Interp *interp, int objc, Tcl_Obj *const objv[], void *recordPtr)
+{
+    Treeview *tv = recordPtr;
+    TreeItem *item, *parent;
+    TreeItem *sibling;
+
+    if (objc != 5) {
+	Tcl_WrongNumArgs(interp, 2, objv, "item parent index");
+	return TCL_ERROR;
+    }
+    if (   (item = FindItem(interp, tv, objv[2])) == 0
+	|| (parent = FindItem(interp, tv, objv[3])) == 0)
+    {
+	return TCL_ERROR;
+    }
+
+    /* Locate previous sibling based on $index:
+     */
+    if (!strcmp(Tcl_GetString(objv[4]), "end")) {
+	sibling = EndPosition(parent);
+    } else {
+	int index;
+	if (Tcl_GetIntFromObj(interp, objv[4], &index) != TCL_OK)
+	    return TCL_ERROR;
+	sibling = InsertPosition(parent, index);
+    }
+
+    /* Check ancestry:
+     */
+    if (!AncestryCheck(interp, tv, item, parent))
+	return TCL_ERROR;
+
+    /* Moving an item after itself is a no-op:
+     */
+    if (item == sibling) {
+	return TCL_OK;
+    }
+
+    /* Move item:
+     */
+    DetachItem(item);
+    InsertItem(parent, sibling, item);
+
+    TtkRedisplayWidget(&tv->core);
+    return TCL_OK;
+}
+
+/*------------------------------------------------------------------------
+ * +++ Widget commands -- scrolling
+ */
+
+static int TreeviewYViewCommand(
+    Tcl_Interp *interp, int objc, Tcl_Obj *const objv[], void *recordPtr)
+{
+    Treeview *tv = recordPtr;
+    return ScrollviewCommand(interp, objc, objv, tv->tree.yscrollHandle);
+}
+
+/* $tree see $item --
+ * 	Ensure that $item is visible.
+ */
+static int TreeviewSeeCommand(
+    Tcl_Interp *interp, int objc, Tcl_Obj *const objv[], void *recordPtr)
+{
+    Treeview *tv = recordPtr;
+    TreeItem *item, *parent;
+    int rowNumber;
+
+    if (objc != 3) {
+	Tcl_WrongNumArgs(interp, 2, objv, "item");
+	return TCL_ERROR;
+    }
+    if (!(item = FindItem(interp, tv, objv[2]))) {
+	return TCL_ERROR;
+    }
+
+    /* Make sure all ancestors are open:
+     */
+    for (parent = item->parent; parent; parent = parent->parent) {
+	if (!(parent->state & TTK_STATE_OPEN)) {
+	    parent->openObj = unshare(parent->openObj);
+	    Tcl_SetBooleanObj(parent->openObj, 1);
+	    parent->state |= TTK_STATE_OPEN;
+	}
+    }
+
+    /* Make sure item is visible:
+     * @@@ DOUBLE-CHECK THIS:
+     */
+    rowNumber = RowNumber(tv, item);
+    if (rowNumber < tv->tree.yscroll.first) {
+	ScrollTo(tv->tree.yscrollHandle, rowNumber);
+    } else if (rowNumber >= tv->tree.yscroll.last) {
+	ScrollTo(tv->tree.yscrollHandle,
+	    tv->tree.yscroll.first + (1+rowNumber - tv->tree.yscroll.last));
+    }
+
+    return TCL_OK;
+}
+
+/*------------------------------------------------------------------------
+ * +++ Widget commands -- focus and selection
+ */
+
+/* + $tree focus ?item?
+ */
+static int TreeviewFocusCommand(
+    Tcl_Interp *interp, int objc, Tcl_Obj *const objv[], void *recordPtr)
+{
+    Treeview *tv = recordPtr;
+
+    if (objc == 2) {
+	if (tv->tree.focus) {
+	    Tcl_SetObjResult(interp, ItemID(tv, tv->tree.focus));
+	}
+	return TCL_OK;
+    } else if (objc == 3) {
+	TreeItem *newFocus = FindItem(interp, tv, objv[2]);
+	if (!newFocus)
+	    return TCL_ERROR;
+	tv->tree.focus = newFocus;
+	TtkRedisplayWidget(&tv->core);
+	return TCL_OK;
+    } else {
+	Tcl_WrongNumArgs(interp, 2, objv, "?newFocus?");
+	return TCL_ERROR;
+    }
+}
+
+/* + $tree selection ?add|remove|set|toggle $items?
+ */
+static int TreeviewSelectionCommand(
+    Tcl_Interp *interp, int objc, Tcl_Obj *const objv[], void *recordPtr)
+{
+    enum {
+	SELECTION_SET, SELECTION_ADD, SELECTION_REMOVE, SELECTION_TOGGLE
+    };
+    static const char *selopStrings[] = {
+	"set", "add", "remove", "toggle", NULL
+    };
+
+    Treeview *tv = recordPtr;
+    int selop, i;
+    TreeItem *item, **items;
+
+    if (objc == 2) {
+	Tcl_Obj *result = Tcl_NewListObj(0,0);
+	for (item = tv->tree.root->children; item; item=NextPreorder(item)) {
+	    if (item->state & TTK_STATE_SELECTED)
+		Tcl_ListObjAppendElement(NULL, result, ItemID(tv, item));
+	}
+	Tcl_SetObjResult(interp, result);
+	return TCL_OK;
+    }
+
+    if (objc != 4) {
+    	Tcl_WrongNumArgs(interp, 2, objv, "?add|remove|set|toggle items?");
+	return TCL_ERROR;
+    }
+
+    if (Tcl_GetIndexFromObj(interp, objv[2], selopStrings,
+	    "selection operation", 0, &selop) != TCL_OK)
+    {
+	return TCL_ERROR;
+    }
+
+    items = GetItemListFromObj(interp, tv, objv[3]);
+    if (!items) {
+	return TCL_ERROR;
+    }
+
+    switch (selop)
+    {
+	case SELECTION_SET:
+	    for (item=tv->tree.root; item; item=NextPreorder(item)) {
+		item->state &= ~TTK_STATE_SELECTED;
+	    }
+	    /*FALLTHRU*/
+	case SELECTION_ADD:
+	    for (i=0; items[i]; ++i) {
+		items[i]->state |= TTK_STATE_SELECTED;
+	    }
+	    break;
+	case SELECTION_REMOVE:
+	    for (i=0; items[i]; ++i) {
+		items[i]->state &= ~TTK_STATE_SELECTED;
+	    }
+	    break;
+	case SELECTION_TOGGLE:
+	    for (i=0; items[i]; ++i) {
+		items[i]->state ^= TTK_STATE_SELECTED;
+	    }
+	    break;
+    }
+
+    ckfree((ClientData)items);
+    SendVirtualEvent(tv->core.tkwin, "TreeviewSelect");
+    TtkRedisplayWidget(&tv->core);
+
+    return TCL_OK;
+}
+
+/*------------------------------------------------------------------------
+ * +++ Widget commands -- tags and bindings.
+ */
+
+/* + $tv tag bind $tag ?$sequence ?$script??
+ */
+static int TreeviewTagBindCommand(
+    Tcl_Interp *interp, int objc, Tcl_Obj *const objv[], void *recordPtr)
+{
+    Treeview *tv = recordPtr;
+    Ttk_Tag tag;
+
+    if (objc < 4 || objc > 6) {
+    	Tcl_WrongNumArgs(interp, 3, objv, "tagName ?sequence? ?script?");
+	return TCL_ERROR;
+    }
+
+    tag = Ttk_GetTagFromObj(tv->tree.tagTable, objv[3]);
+    if (!tag) { return TCL_ERROR; }
+
+    if (objc == 4) {		/* $tv tag bind $tag */
+	Tk_GetAllBindings(interp, tv->tree.bindingTable, tag);
+    } else if (objc == 5) { 	/* $tv tag bind $tag $sequence */
+	/* TODO: distinguish "no such binding" (OK) from "bad pattern" (ERROR)
+	 */
+	const char *script = Tk_GetBinding(interp,
+		tv->tree.bindingTable, tag, Tcl_GetString(objv[4]));
+	if (script != NULL) {
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(script,-1));
+	}
+    } else if (objc == 6) {	/* $tv tag bind $tag $sequence $script */
+	CONST char *sequence = Tcl_GetString(objv[4]);
+	CONST char *script = Tcl_GetString(objv[5]);
+	unsigned long mask = Tk_CreateBinding(interp,
+		tv->tree.bindingTable, tag, sequence, script, 0);
+
+	/* Test mask to make sure event is supported:
+	 */
+	if (mask & (~TreeviewBindEventMask)) {
+	    Tk_DeleteBinding(interp, tv->tree.bindingTable, tag, sequence);
+	    Tcl_ResetResult(interp);
+	    Tcl_AppendResult(interp, "unsupported event ", sequence,
+		"\nonly key, button, motion, and virtual events supported",
+		NULL);
+	    return TCL_ERROR;
+	}
+
+	return mask ? TCL_OK : TCL_ERROR;
+    }
+    return TCL_OK;
+}
+
+/* + $tv tag configure $tag ?-option ?value -option value...??
+ */
+static int TreeviewTagConfigureCommand(
+    Tcl_Interp *interp, int objc, Tcl_Obj *const objv[], void *recordPtr)
+{
+    Treeview *tv = recordPtr;
+    void *tagRecord;
+    Ttk_Tag tag;
+
+    if (objc < 4) {
+    	Tcl_WrongNumArgs(interp, 3, objv, "tagName ?-option ?value ...??");
+	return TCL_ERROR;
+    }
+
+    tag = Ttk_GetTagFromObj(tv->tree.tagTable, objv[3]);
+    tagRecord = Ttk_TagRecord(tag);
+
+    if (objc == 4) {
+	return EnumerateOptions(interp, tagRecord, TagOptionSpecs,
+		tv->tree.tagOptionTable, tv->core.tkwin);
+    } else if (objc == 5) {
+	return GetOptionValue(interp, tagRecord, objv[4],
+		tv->tree.tagOptionTable, tv->core.tkwin);
+    }
+    /* else */
+    TtkRedisplayWidget(&tv->core);
+    return Tk_SetOptions(
+	interp, tagRecord, tv->tree.tagOptionTable,
+	objc - 4, objv + 4, tv->core.tkwin,
+	NULL/*savedOptions*/, NULL/*mask*/);
+}
+
+/* + $tv tag option args...
+ */
+static int TreeviewTagCommand(
+    Tcl_Interp *interp, int objc, Tcl_Obj *const objv[], void *recordPtr)
+{
+    static WidgetCommandSpec TreeviewTagCommands[] = {
+	{ "bind",	TreeviewTagBindCommand },
+	{ "configure",	TreeviewTagConfigureCommand },
+	{0,0}
+    };
+    return WidgetEnsembleCommand(
+	    TreeviewTagCommands, 2, interp, objc, objv, recordPtr);
+}
+
+/*------------------------------------------------------------------------
+ * +++ Widget commands record.
+ */
+static WidgetCommandSpec TreeviewCommands[] =
+{
+    { "bbox",  		TreeviewBBoxCommand },
+    { "children",	TreeviewChildrenCommand },
+    { "cget",		WidgetCgetCommand },
+    { "column", 	TreeviewColumnCommand },
+    { "configure",	WidgetConfigureCommand },
+    { "delete", 	TreeviewDeleteCommand },
+    { "detach", 	TreeviewDetachCommand },
+    { "exists", 	TreeviewExistsCommand },
+    { "focus", 		TreeviewFocusCommand },
+    { "heading", 	TreeviewHeadingCommand },
+    { "identify",  	TreeviewIdentifyCommand },
+    { "index",  	TreeviewIndexCommand },
+    { "instate",	WidgetInstateCommand },
+    { "insert", 	TreeviewInsertCommand },
+    { "item", 		TreeviewItemCommand },
+    { "move", 		TreeviewMoveCommand },
+    { "next", 		TreeviewNextCommand },
+    { "parent", 	TreeviewParentCommand },
+    { "prev", 		TreeviewPrevCommand },
+    { "see", 		TreeviewSeeCommand },
+    { "selection" ,	TreeviewSelectionCommand },
+    { "set",  		TreeviewSetCommand },
+    { "state",  	WidgetStateCommand },
+    { "tag",    	TreeviewTagCommand },
+    { "yview",  	TreeviewYViewCommand },
+    { NULL, NULL }
+};
+
+/*------------------------------------------------------------------------
+ * +++ Widget definition.
+ */
+
+WidgetSpec TreeviewWidgetSpec =
+{
+    "Treeview",			/* className */
+    sizeof(Treeview),   	/* recordSize */
+    TreeviewOptionSpecs,	/* optionSpecs */
+    TreeviewCommands,   	/* subcommands */
+    TreeviewInitialize,   	/* initializeProc */
+    TreeviewCleanup,		/* cleanupProc */
+    TreeviewConfigure,    	/* configureProc */
+    NullPostConfigure,  	/* postConfigureProc */
+    TreeviewGetLayout, 		/* getLayoutProc */
+    TreeviewSize, 		/* sizeProc */
+    TreeviewDoLayout,		/* layoutProc */
+    TreeviewDisplay		/* displayProc */
+};
+
+/*------------------------------------------------------------------------
+ * +++ Layout specifications.
+ */
+
+TTK_BEGIN_LAYOUT(TreeviewLayout)
+    TTK_GROUP("Treeview.field", TTK_FILL_BOTH|TTK_BORDER,
+	TTK_GROUP("Treeview.padding", TTK_FILL_BOTH,
+	    TTK_NODE("Treeview.client", TTK_FILL_BOTH)))
+TTK_END_LAYOUT
+
+TTK_BEGIN_LAYOUT(ItemLayout)
+    TTK_GROUP("Treeitem.padding", TTK_FILL_BOTH,
+	TTK_NODE("Treeitem.indicator", TTK_PACK_LEFT)
+	TTK_NODE("Treeitem.image", TTK_PACK_LEFT)
+	TTK_GROUP("Treeitem.focus", TTK_PACK_LEFT,
+	    TTK_NODE("Treeitem.text", TTK_PACK_LEFT)))
+TTK_END_LAYOUT
+
+TTK_BEGIN_LAYOUT(CellLayout)
+    TTK_GROUP("Treedata.padding", TTK_FILL_BOTH,
+	TTK_NODE("Treeitem.label", TTK_FILL_BOTH))
+TTK_END_LAYOUT
+
+TTK_BEGIN_LAYOUT(HeadingLayout)
+    TTK_NODE("Treeheading.cell", TTK_FILL_BOTH)
+    TTK_GROUP("Treeheading.border", TTK_FILL_BOTH,
+	TTK_NODE("Treeheading.image", TTK_PACK_RIGHT)
+	TTK_NODE("Treeheading.text", TTK_FILL_X))
+TTK_END_LAYOUT
+
+TTK_BEGIN_LAYOUT(RowLayout)
+    TTK_NODE("Treeitem.row", TTK_FILL_BOTH)
+TTK_END_LAYOUT
+
+/*------------------------------------------------------------------------
+ * +++ Tree indicator element.
+ */
+
+#if defined(WIN32)
+static const int WIN32_XDRAWLINE_HACK = 1;
+#else
+static const int WIN32_XDRAWLINE_HACK = 0;
+#endif
+
+typedef struct
+{
+    Tcl_Obj *colorObj;
+    Tcl_Obj *sizeObj;
+    Tcl_Obj *marginsObj;
+} TreeitemIndicator;
+
+static Ttk_ElementOptionSpec TreeitemIndicatorOptions[] =
+{
+    { "-foreground", TK_OPTION_COLOR,
+	Tk_Offset(TreeitemIndicator,colorObj), DEFAULT_FOREGROUND },
+    { "-indicatorsize", TK_OPTION_PIXELS,
+	Tk_Offset(TreeitemIndicator,sizeObj), "12" },
+    { "-indicatormargins", TK_OPTION_STRING,
+	Tk_Offset(TreeitemIndicator,marginsObj), "2 2 4 2" },
+    {NULL}
+};
+
+static void TreeitemIndicatorSize(
+    void *clientData, void *elementRecord, Tk_Window tkwin,
+    int *widthPtr, int *heightPtr, Ttk_Padding *paddingPtr)
+{
+    TreeitemIndicator *indicator = elementRecord;
+    int size = 0;
+
+    Ttk_GetPaddingFromObj(NULL, tkwin, indicator->marginsObj, paddingPtr);
+    Tk_GetPixelsFromObj(NULL, tkwin, indicator->sizeObj, &size);
+
+    *widthPtr = *heightPtr = size;
+}
+
+static void TreeitemIndicatorDraw(
+    void *clientData, void *elementRecord, Tk_Window tkwin,
+    Drawable d, Ttk_Box b, Ttk_State state)
+{
+    TreeitemIndicator *indicator = elementRecord;
+    ArrowDirection direction =
+	(state & TTK_STATE_OPEN) ? ARROW_DOWN : ARROW_RIGHT;
+    Ttk_Padding margins;
+    XColor *borderColor = Tk_GetColorFromObj(tkwin, indicator->colorObj);
+    XGCValues gcvalues; GC gc; unsigned mask;
+
+    if (state & TTK_STATE_LEAF) /* don't draw anything */
+	return;
+
+    Ttk_GetPaddingFromObj(NULL,tkwin,indicator->marginsObj,&margins);
+    b = Ttk_PadBox(b, margins);
+
+    gcvalues.foreground = borderColor->pixel;
+    gcvalues.line_width = 1;
+    mask = GCForeground | GCLineWidth;
+    gc = Tk_GetGC(tkwin, mask, &gcvalues);
+
+    DrawArrow(Tk_Display(tkwin), d, gc, b, direction);
+
+    Tk_FreeGC(Tk_Display(tkwin), gc);
+}
+
+static Ttk_ElementSpec TreeitemIndicatorElementSpec =
+{
+    TK_STYLE_VERSION_2,
+    sizeof(TreeitemIndicator),
+    TreeitemIndicatorOptions,
+    TreeitemIndicatorSize,
+    TreeitemIndicatorDraw
+};
+
+/*------------------------------------------------------------------------
+ * +++ Row element.
+ */
+
+typedef struct
+{
+    Tcl_Obj *backgroundObj;
+    Tcl_Obj *rowNumberObj;
+} RowElement;
+
+static Ttk_ElementOptionSpec RowElementOptions[] =
+{
+    { "-background", TK_OPTION_COLOR,
+	Tk_Offset(RowElement,backgroundObj), DEFAULT_BACKGROUND },
+    { "-rownumber", TK_OPTION_INT,
+	Tk_Offset(RowElement,rowNumberObj), "0" },
+    {NULL}
+};
+
+static void RowElementDraw(
+    void *clientData, void *elementRecord, Tk_Window tkwin,
+    Drawable d, Ttk_Box b, Ttk_State state)
+{
+    RowElement *row = elementRecord;
+    XColor *color = Tk_GetColorFromObj(tkwin, row->backgroundObj);
+    GC gc = Tk_GCForColor(color, d);
+    XFillRectangle(Tk_Display(tkwin), d, gc,
+	    b.x, b.y, b.width, b.height);
+}
+
+static Ttk_ElementSpec RowElementSpec =
+{
+    TK_STYLE_VERSION_2,
+    sizeof(RowElement),
+    RowElementOptions,
+    NullElementGeometry,
+    RowElementDraw
+};
+
+/*------------------------------------------------------------------------
+ * +++ Initialisation.
+ */
+DLLEXPORT int Treeview_Init(Tcl_Interp *interp)
+{
+    Ttk_Theme theme = Ttk_GetDefaultTheme(interp);
+
+    RegisterWidget(interp, "ttk::treeview", &TreeviewWidgetSpec);
+
+    Ttk_RegisterElement(interp, theme,
+	    "Treeitem.indicator", &TreeitemIndicatorElementSpec, 0);
+    Ttk_RegisterElement(interp, theme, "Treeitem.row", &RowElementSpec, 0);
+    Ttk_RegisterElement(interp, theme, "Treeheading.cell", &RowElementSpec, 0);
+
+    Ttk_RegisterLayout(theme, TreeviewWidgetSpec.className, TreeviewLayout);
+    Ttk_RegisterLayout(theme, "Item", ItemLayout);
+    Ttk_RegisterLayout(theme, "Cell", CellLayout);
+    Ttk_RegisterLayout(theme, "Heading", HeadingLayout);
+    Ttk_RegisterLayout(theme, "Row", RowLayout);
+
+    Tcl_PkgProvide(interp, "ttk::treeview", TTK_VERSION);
+
+    return TCL_OK;
+}
+
+/*EOF*/