What's New in TkTreeCtrl 2.4.1

Bug Fixes

[BUG 3421503] Creating a new treectrl widget would crash the application if the default value of either of the -buttonbitmap or -buttonimage options was changed using the Tk option database.
[BUG 3421503] Random crashes could result when using hidden columns due to writing past the end of an array.

What's New in TkTreeCtrl 2.4

Changes since 2.4b2:

There were no changes since 2.4b2.

Changes since 2.4b1:

Fixed the header config option -text being treated like a per-state option.
Fixed rectangle and 3D border drawing on X11 due to 16-bit coordinates. When items or headers were very wide, rectangles and borders wouldn't be drawn correctly.
Fixed dragging headers in locked columns not displaying correctly.
Fixed [identify] when right-locked headers were drawn over left-locked headers, the point was reported as being in the left-locked headers.
Fixed a library-script error when dragging headers when only locked columns were visible.
Fixed -canvaspady being ignored when only locked columns were visible.
Fixed the column-resize proxy line going past the right edge of a column when resizing right-locked columns.
Right-locked columns are always resized by their left edge now. Previously, only the leftmost and rightmost right-locked columns were resized by their left edge, which was inconsistent and weird.
If an instance element was displaying its master's -textvariable string, the instance element would not be redisplayed when that -textvariable variable was modified.
The spans of dragged headers are restricted to the range of dragged columns, and the spans of non-dragged headers are terminated if they reach the first dragged column.
Improved column-spanning behavior. See "Column Spanning" below.
Fixed widget borders not being redrawn if an <Expose> event didn't also overlap the content area.
Fixed the -background and -borderwidth header options being ignored in the tail column.
Fixed a few memory leaks with the new column header code.

Header Command

New	Comment
header create	Creates a new row of column headers. The result is a unique ID for that header-row.
header delete	Deletes one or more header-rows. The top header-row, created when a treectrl is created, cannot be deleted.
header cget header configure	These commands work on both entire header-rows and individual columns within header-rows. The column configure command may also be used to configure column headers in the top header-row.
header bbox header compare header count header element header id header image header span header state header style header text header tag	These commands have the same syntax as the item subcommands of the same name. Header-rows are actually implemented as items. The header image and header text commands will change either the first image or text element in a custom style assigned to a column header, or the -image and -text options of a column header when no custom style is assigned. The header state command operates on header states, which are distinct from item states. See the updated section called STATES in the manual.
header dragcget header dragconfigure	Same as the column dragcget and column dragconfigure commands. The visual feedback when dragging column headers has changed. As a result, the following options are deprecated and have no effect: -imagecolor -indicatorcolor -indicatorside

Column Configuration Options

Option	Comment
-arrow direction -arrowbitmap bitmap -arrowgravity direction -arrowimage image -arrowpadx amount -arrowpady amount -arrowside side -background color -bitmap bitmap -borderwidth size -button boolean -font fontName -image image -imagepadx amount -imagepady amount -justify justification -state state -text text -textcolor color -textlines count -textpadx amount -textpady amount	All these options related to column headers are no longer a part of a column itself. Instead, these options were moved to the new column header API. These options can still be accessed using column cget and column configure, but only for the top row of column headers. To access these options in header-rows other than the top row, use the header cget and header configure command.

Option

Comment

-arrow direction
-arrowbitmap bitmap
-arrowgravity direction
-arrowimage image
-arrowpadx amount
-arrowpady amount
-arrowside side
-background color
-bitmap bitmap
-borderwidth size
-button boolean
-font fontName
-image image
-imagepadx amount
-imagepady amount
-justify justification
-state state
-text text
-textcolor color
-textlines count
-textpadx amount
-textpady amount

All these options related to column headers are no longer a part of a column itself. Instead, these options were moved to the new column header API.

These options can still be accessed using column cget and column configure, but only for the top row of column headers.

To access these options in header-rows other than the top row, use the header cget and header configure command.

Element Command

Arguments Changed	Comment
element create element cget	The new option -statedomain accepts a value of item or header. The default value is item. This option is used to distinguish between elements used in items and elements used in column headers, since items and headers have a different set of state flags. The value of this option cannot be changed.

Item Command

New	Comment
item state define item state linkage item state names item state undefine	All the old subcommands of the widget state command are now in the updated item state command. This was done because items and headers have a different set of states. Defining new header states is done using the new header state command.

Style Command

Arguments Changed	Comment
style create style cget	The new option -statedomain accepts a value of item or header. The default value is item. This option is used to distinguish between styles used in items and styles used in column headers, since items and headers have a different set of state flags. The value of this option cannot be changed.
style layout	A new style layout option was added called -center. The -center option allows one or more elements to be centered within a style.

TreeCtrl Command

Arguments/Result Changed	Comment
bbox	Three new areas are defined, header.left, header.none, and header.right, to get the bounds of the different groups of locked/unlocked column headers. The words after "header." are each possible value of the column option -lock.
identify	To make the result of this command easier to use, especially with the new column header code, a new option was added that sets the elements of an array variable rather than returning the result as a list. .t identify -array id $x $y The above call will alter the array variable named "id" with info about what is under the given coordinates.

TreeCtrl Configuration Options

New	Comment
-headerfont	This is the font used for drawing text in column headers. The default value is TkHeadingFont where that font is defined (usually on Tk 8.5+), otherwise it is the default listbox font. On Mac OS X, TkHeadingFont is the small system font used for drawing text in the fixed-height headers. This new option results in a different default look to column text on X11, where TkHeadingFont is a bold font.
-headerfg -headerforeground	This is the foreground text color used when drawing text in column headers. On Gtk+, the system theme may override this color.

Headers

The treectrl widget now supports multiple rows of column headers. In the documentation, an entire row of column headers is referred to as a header-row.

There is always one header-row with the unique ID "0". It may also be referred to using the header description "first". This top header-row cannot be deleted.
Configuring column header options (such as -image and -text) in the top header-row can be done using column configure, the same as in previous versions. To configure column header options in specific header-rows, the header configure command must be used.
Column spanning is supported using the header span command.
The appearance of column headers may be customized using styles. When creating elements and styles for use in column headers, the "-statedomain header" option must be used.
```
.t element create MyHeaderElement text -statedomain header
.t style create MyHeaderStyle -statedomain header
```

Element Changes

There is a brand-new element type called header which displays a themed (or non-themed) column header background and sort arrow.
To support the new column header code - which is implemented using styles - bitmap, image, and text elements are offset by 1,1 pixels when displayed in a column header that is in the "pressed" state.
The default color of text elements in column headers is -headerforeground, not -foreground.
The default font of text elements in column headers is -headerfont, not -font.

Event Changes

The <ColumnDrag> and <Header> events have a new substitution character, %H, which is replaced by the unique ID of the header-row involved.
A new event, <ColumnDrag-indicator>, is generated whenever the place to drop a dragged column header is updated.
A new event, <Header-state>, is generated whenever the state of an individual column header is changed during mouse-pointer events.

Column Spanning

Previously, a style spanning more than one column would request all of its width in the first column of the span. Now, a style distributes its width across all the visible columns in a span, taking into account the -minwidth, -width, and -maxwidth column options.

Also, when calculating the needed height of an item or header, spans were ignored. Only the width of the first column in a span was considered when calculating the needed height of a style. As a result, an item might appear much taller than it needed when lines of text were wrapping.

Demo Changes

A new demo called "Headers" was added to demonstrate multiple rows of column headers and customizing the appearance of column headers using styles.
The "Column Spanning" demo was updated to take advantage of the new column-spanning algorithm. Previously, the -width option of each column needed to be set to the width of the "Span 1" style, otherwise the columns would have been as wide as the widest style in that column, and resizing columns caused gaps to appear between styles.
The three "Gradients" demos were updated to take advantage of the new column-spanning algorithm. Previously, the -width of the text elements displaying long lines of descriptive text was set to the total width of the columns. If the text was allowed to wrap, the height of the items would be wrong since spans were ignored. Now the text wraps nicely when columns are resized.

What's New in TkTreeCtrl 2.3.2

Bug Fixes

Fixed a bug where elements could expand too much, due to not accounting for the padding of elements in a -union correctly.
Build fix: don't use GNU Make conditionals in the Makefile. Instead, parts of the name of the archive created by the 'dist-win' target are calculated in configure.ac.
Build fix: make sure $MATH_LIBS (including -lm on AIX) is added to the list of link libraries on Unix platforms.
Build fix: removed trailing commas from some enum declarations to make strict C89 compilers happy (i.e., AIX).
Build fix: the Mac OS X SDK prior to version 10.5 does not have CGFloat defined.
Build fix: the Microsoft Platform SDK does not include <vsstyle.h>, unlike the Windows SDK, therefore that header file is no longer used.

What's New in TkTreeCtrl 2.3.1

Style Configuration Options

New	Comment
-buttony	This option allows you to specify the distance from the top of an item that the expand/collapse button is drawn. When the value of this option is unspecified, the button is centered vertically in the item.

Demo Changes

The Style Editor now has 2 scale widgets to make testing the -expand and -squeeze layout options easier.
Rewrote the "Outlook Express (Folders)" demo to use a single item style instead of 4 different styles.
Fixed an off-by-1 error in the placement of the iMovie demo name-editing entry widget.

Bug Fixes

64bit: Fixed pointer truncation leading to crashes when memory allocations exceeded 4GB.
64bit: Lots of casting to quiet MSVC compiler warnings.
64bit: Fixed shellicon debug build failure when using MSVC.
Removed the use of <gdiplus.h> which broke MinGW-w64 builds and MinGW32 cross-compilation.
Fixed panic() when running the X11 debug build.
Use Tcl_PrintDouble() and Tcl_NewDoubleObj() instead of the %g specifier to fix a bug reported on comp.lang.tcl where the floating point numbers passed to the scrollbar command contained a comma (due to a locale issue).
Hit-testing of buttons now considers the vertical placement and size of buttons. Previously, the [identify] command would report that the given coordinates were over a button no matter how tall the item was.
Mac OS X: Column header layout was broken, resulting in incorrect justification of the header bitmap/image/text as well as the sort arrow being drawn overtop the bitmap/image/text.
The needed width of all item styles in a column was not being recalculated when deleting items.
The needed width of column headers was not being recalculated when the -usetheme option changed.
Some commands, such as [item bbox], would return incorrect results if called after a column was resized but before the next display update.
The calculation of the minimum size needed by a style was broken when -squeeze layout was used except for -squeeze=x -orient=horizontal.
The -itembackground colors were not being drawn when a transparent -backgroundimage was used.

What's New in TkTreeCtrl 2.3

Changes since 2.3b1

Removed the gradient api command.
New option -enabled may be passed to the item create command.
The Escape key cancels any drag-and-drop in progress with the TreeCtrlFileList bindings.
With -selectmode=single the marquee is not used with the TreeCtrlFileList bindings.
Fixed the <Escape> key causing an error when the last visible item was selected.
Updated the documentation to include -gridleftcolor and -gridrightcolor.
Added a section to the documentation titled THE CANVAS and linked to that section wherever the canvas is mentioned.

Column Configuration Options

New	Comment
-gridleftcolor -gridrightcolor	So-called "grid lines". These two options specify a color or gradient to draw on the left and/or right edge of the column. The lines are drawn overtop an item's style and down in the whitespace region below any items.
Usage Changed	How it changed
-itembackground	Item background colors can be a Tk color or a gradient name. Item background colors are now drawn below items in the whitespace region even when item wrapping is being used. Previously item background colors were not drawn below items when wrapping was used.
-textcolor	This is now a per-state option, just like the -background option, which may be incompatible. If you previously specified a Tk color name with a space in it, such as "light blue", then you will need to make the value a proper list: $T column configure $C -textcolor [list "light blue"] When this option is unspecified (the default), the system theme can specify the color. Currently that behavior is only used with the Gtk+ build of treectrl.

Item Command

New	Comment
buttonstate	The value of this option can be active, normal or pressed. This is used to change the appearance of the expand/collapse buttons. On Gtk+ the buttons change appearance when the mouse pointer is over them and when they are clicked. On Mac OS X the buttons change appearance when they are clicked. On MS Windows the buttons change appearance when the mouse pointer is over them, but only when the Explorer theme is used (see the new theme setwindowtheme command).
Arguments Changed	What changed
create	New option -enabled.
collapse expand toggle	A new option -animate was added to support animated disclosure triangles on Gtk+ and Mac OS X. The library scripts pass the -animate option when clicking on a button, but not when toggling items using the keyboard.

Marquee Configuration Options

New	Comment
-fill	Specifies the fill color for the selection rectangle. The value can be a Tk color or a gradient name or an empty string (the default). When this option isn't an empty string the dotted outline is not drawn. By specifying the name of a semi-transparent gradient a modern-looking selection rectangle can be achieved.
-outline	Specifies the outline color for the selection rectangle. The value can be a Tk color, a gradient name, or an empty string which is the default. When this option isn't an empty string the dotted outline is not drawn.

Style Layout Options

Behavior Changed	What changed
-union	Previously, nesting -union elements had undefined behavior. Now it is ok to include an element with -union layout in another element's -union list.

TreeCtrl Configuration Options

New	Comment
-bgimage	This is a synonym for the -backgroundimage option.
-bgimageanchor	Controls the alignment of the -backgroundimage. The value is a standard Tk anchor position such as "nw", "se" or "center", etc. The image is aligned to the content area when the image doesn't scroll, otherwise the image is aligned to the canvas. The default is "nw".
-bgimageopaque	A boolean that indicates whether or not the -backgroundimage is partially transparent. This is needed because there is no way to tell in Tk whether an image contains transparency. The default is true, so if you use a transparent -backgroundimage you must set this to false.
-bgimagescroll	Controls whether the -backgroundimage scrolls along with the items or remains locked in place. The value can be an emptry string for no scrolling, "x" for horizontal scrolling only, "y" for vertical scrolling only, or "xy" (the default) for scrolling in both directions.
-bgimagetile	Controls whether the -backgroundimage is tiled along the x and y axes. The value can be "", "x", "y" or "xy" (the default).
-buttontracking	On Mac OS X and Gtk+ the expand/collapse buttons don't toggle when they are clicked, only when the mouse button is released over them, like regular pushbuttons. The value of this option is a boolean; when true the buttons toggle when the mouse button is released, when false the buttons toggle when clicked. The default is true on Mac OS X and Gtk+, false on Win32 and X11.
-canvaspadx -canvaspady	These options allow whitespace margins around the edges of the canvas. This is useful for 2D views where you don't want the items to butt against the window borders. The value of each option is a list of one or two screen distances specifying the width of the left/right margins and the height of the top/bottom margins respectively.
-itemgapx -itemgapy	These options allow whitespace gaps between adjacent items. This is useful for 2D views such as an icon view in a file browser or an image thumbnail list. The value of each option is a screen distance defaulting to zero.
-xscrollsmoothing -yscrollsmoothing	When these options are set to true and the xview or yview commands are called to scroll by "units", scrolling occurs according to the -xscrollincrement or -yscrollincrement options, and all other scrolling is done as if the -xscrollincrement or -yscrollincrement options were set to 1. The effect is that when dragging the scrollbar thumb scrolling is very smooth, but when clicking the scrollbar buttons scrolling is done in coarser increments.
Usage Changed	How it changed
-columnresizemode	The default value is "realtime", it used to be "proxy".
-showlines	The default value is false on Mac OS X and Gtk+, true on Win32 and X11.
-usetheme	The default value is now true. Complete reversal from previous versions, head for the hills.

TreeCtrl Command

New	Comment
gradient	Linear gradients! There are a number of issues when using gradients, see the demos and the relevant sections in the manual page for more info.
theme	The theme platform command returns the API used to draw themed parts of the treectrl. On Mac OS X the result is always aqua. On MS Windows the result is visualstyles if the uxtheme.dll was loaded and visual themes are in use, otherwise X11 is returned to indicate the Tk Xlib calls are drawing the themed parts. On Unix systems the result is gtk if the Gtk+ version of treectrl was built, otherwise X11 is returned. MS Windows only: The theme setwindowtheme command takes the name of an application whose theme should be used. If you call... $T theme setwindowtheme "Explorer" ...on Windows 7 the disclosure triangles of the Explorer file browser will be used rather than +/- buttons.

New

Comment

gradient

Linear gradients! There are a number of issues when using gradients, see the demos and the relevant sections in the manual page for more info.

theme

The theme platform command returns the API used to draw themed parts of the treectrl.

On Mac OS X the result is always aqua.
On MS Windows the result is visualstyles if the uxtheme.dll was loaded and visual themes are in use, otherwise X11 is returned to indicate the Tk Xlib calls are drawing the themed parts.
On Unix systems the result is gtk if the Gtk+ version of treectrl was built, otherwise X11 is returned.

MS Windows only: The theme setwindowtheme command takes the name of an application whose theme should be used. If you call...

$T theme setwindowtheme "Explorer"

...on Windows 7 the disclosure triangles of the Explorer file browser will be used rather than +/- buttons.

Gtk+ Theme

Pass --enable-gtk=yes to configure to build a Gtk+ version of treectrl. This requires proper pkg-config setup for the gtk+-2.0 and gdk-pixbuf-xlib-2.0 libraries.
Leave the column option -textcolor={} so the theme colors will be used for column header labels.
Leave the new widget option -buttontracking=yes for native behavior when clicking buttons.
BUG: Currently the theme does not change when the system theme changes.

Rect Element

Rounded rectangles can be drawn using the new rect element configuration options -rx and -ry. These options specify the radius of the corners as screen distances. The values are restricted to a maximum of half the width or height of the rectangle when being displayed.
The -open option is now per-state. See the "Outlook Express (Newsgroup)" demo where the active outline of the selection rectangle appears to span across columns. In previous versions that required 3 different styles.
The -fill and -outline options can be a Tk color or a gradient.

Library Scripts

The treectrl window gets the focus after a <ButtonPress-2> event begins scan-dragging.
The Escape key cancels any drag-and-drop in progress with the TreeCtrlFileList bindings.
With -selectmode=single the marquee is not used with the TreeCtrlFileList bindings.
Added some hackery to the TreeCtrlFileList bindings for emulating the complicated selection behavior of Windows 7 Explorer:
- Added TreeCtrl::FileListEmulateWin7 to indicate the Windows 7 behavior should be used.
- Added TreeCtrl::SetSensitiveMarquee, just like TreeCtrl::SetSensitive but indicates which elements respond to the selection rectangle. Typically this is the same as the elements passed toTreeCtrl::SetSensitive with the addition of the selection rectangle elements.

Build Changes

Added macosx/ unix/ and win/ subdirectories with platform-specific code in each.
The --enable-cocoa configure option was removed when building on Mac OS X. Instead the configure script determines whether Tk was built using the Cocoa API by examining the TK_LIBS variable.
Cross-compiling on a Unix host using the MingW toolchain should work out-of-the-box now. If the --host configure option contains "mingw32" then TEA_PLATFORM is set to "windows".
The 'make clean' target does a better job cleaning what it should. It doesn't remove the .manifest file generated by configure (make distclean does that), only the linker-generated .manifest when building with MSVC is removed. Resource file objects are cleaned as well.
Various tweaks were made to allow building using the Visual Studio 2008 compiler.
Updated to TEA 3.9.

Shellicon Package

The shellicon package is used to display native file and folder icons on MS Windows. It was updated with a new option -useselected. The value of -useselected may be always, auto or never to control whether the selected version of an icon should be drawn. The default is auto meaning draw the selected icon if the item is selected.

Demo Changes

Added "Explorer (Details, Win7)" and "Explorer (Large Icons, Win7)" demos which very closely match the appearance and behavior of the Windows 7 file explorer. These demos use gradients, rounded rectangles and the new -canvaspadx, -canvaspady, -itemgapx and -itemgapy options.
New demos "Gradients", "Gradients II" and "Gradients II" demonstrate and describe various gradient features.
The "Column Spanning" demo uses gradients.
The ::tk::mac::iconBitmap is used where available for native filesystem icons on Mac OS X.
Fixed a bug with increasing/decreasing the font size if the font size was negative (i.e. on X11).
New options were added to the context menu: -bgimageanchor, -bgimageopaque, -bgimagescroll, -bgimagetile, -buttontracking, -xscrollsmoothing and -yscrollsmoothing.

Bug Fixes

Fixed non-themed expand/collapse buttons being one pixel too large on Mac OS X.
Fixed dotted line and dotted rectangle drawing on Mac OS X.
Fixed the column option -arrowpady being broken for -arrowimage, -arrowbitmap and when themed arrows were drawn. It only worked when the X11 fallback was used.
Fix "Bug 3104147 - Error after widget was destroyed". Various [after] callbacks did not check that the treectrl still existed.
Fix "Bug 3104148 - column "202" doesn't exist". Check that the previously-highlighted column exists before configuring its state in MotionInHeader.
Fixed <Left> and <Right> arrow keys not moving to adjacent items when some items had -wrap=true.
Fixed error with autoscanning when the content area was completely obscurred by locked columns.
Fixed the ordering of some entries in the treectrl option table.
Fixed the <Escape> key causing an error when the last visible item was selected.

What's New in TkTreeCtrl 2.2.10

TreeCtrl Configuration Options

Ignored	Comment
-doublebuffer	This option no longer has any effect but was left in to avoid incompatibilities. Instead, the amount of double-buffering is chosen depending on the platform. Modern platforms such as Mac OS X double-buffer each toplevel whereas older platforms such as Windows XP do not.

Text Element Options

New	Comment
-lmargin1	Specifies how much the first line of text should be indented.
-lmargin2	Specifies how much the 2nd or greater lines should be indented when a line of text wraps.

Mac OS X support for Tk 8.6

Tk 8.6 dropped support for the Carbon API in favor of the modern Cocoa API on Mac OS X. TkTreeCtrl was updated to build using either Carbon (Tk 8.4/8.5) or Cocoa (Tk 8.6). If you are using the back-port of the Cocoa version with Tk 8.5 you can pass the --enable-cocoa=yes configure option when configuring TkTreeCtrl.

Build Changes

Updated to TEA version 3.7 which supports the MODULE_SCOPE macro. As a result, private symbols are not exported by the treectrl shared library on platforms that support it (i.e., gcc's __visibility__("hidden")).

Bug Fixes

Fixed a crash during error processing in [item create] due to missing return statements for the -count and -height options.
Fixed a bug where all item styles would be lost when deleting the 3rd or greater column. This bug affected any item that never had a column record allocated for the 3rd or greater column (usually because no style had been assigned).
Fixed a crash in the [item span] command when specifying "all" for the item description.
The pkgIndex.tcl file correctly handles installation directories with space or bracket characters.
Removed C++ style comments and a spurious semicolon for C89 AIX compliance. [BUG 2886595]
Fixed [item sort -decreasing] not being a "stable" sort. [BUG ID 2909930]
Fixed flickering of the dragimage under Windows 7; this requires more doublebuffering than WinXP even with Aero.
Use more double-buffering on the dragimage to fix flickering/slowness (tested on Ubuntu VM).
Fixed drawing of column/row proxy lines where XOR isn't supported (i.e. MacOSX Cocoa).
Fixed the loupe (screen capture) command under Windows 7; tested on Win7 x64 (with and without Aero) and on WinXP x32.
Fixed an X server error caused by adding a bad rectangle to an XRegion while processing <Expose> events. This would show up with -doublebuffer=window while resizing the window. [BUG 3015429]

Demo Changes

The "Layout" demo uses the new Text element option -lmargin2.
Fixed an undefined-variable error when double-clicking between column headers on X11 in the "Random" demo.
Fixed the resizing of items containing child windows when the Tile theme changes in the "Big List" demo. Also added some comments.
Disabled the dynamic-appearing scrollbars under X11 where I saw some infinite looping.

What's New in TkTreeCtrl 2.2.9

TreeCtrl Command

Arguments/Result Changed	What changed
see	OLD: $T see $item NEW: $T see $item ?$column? ?-center xy? You can specify a particular column to scroll into view horizontally. The -center option will center the item/column in the window instead of performing the minimal amount of scrolling to bring it into view at the edge of the window.

Item Configuration Options

New	Comment
-wrap	When this option is true an item will be the first in a horizontal (when the treectrl option -orient=horizontal) or a vertical (when the treectrl option -orient=vertical) range of items. See the new "iMovie (Wrap)" demo.

Bug Fixes

Fixed a compile error on SunOS due to DUMP_ALLOC being defined in the system headers.
Fixed a bug that caused a panic in B_IncrementFind when calling the [see] command before the widget had displayed itself for the first time.
Fixed a library script error when attempting to drag a column header when the window was so small the items weren't visible.
Fixed two cases where the whitespace would not be properly erased when items being deleted caused scrolling.
Fixed column headers being drawn overtop of the bottom edge of window borders if the window was very short.

Demo Changes

Added the "iMovie (Wrap)" demo to demonstrate the new item option -wrap.

What's New in TkTreeCtrl 2.2.8

Bug Fixes

Fixed a bug that caused a panic in Range_ItemUnderPoint. Thanks to SF.net user 'nobody' who found the problem.
Fixed reading an uninitialized variable when calculating column header layout.

What's New in TkTreeCtrl 2.2.7

TreeCtrl Configuration Options

New	Comment
-showrootchildbuttons	Similar to -showrootlines, this boolean option controls the display of expand/collapse buttons next to child items of the root item.

Indentation change/fix

Previously with -showroot=0, -showbuttons=0, and -showrootlines=0 there was still an extra level of indentation displayed to the left of the root's children. The only way to remove all indentation from the root's children was to set -showlines=0 as well. This is no longer the case and now behaves as expected. With the new -showrootchildbuttons option it is now possible to remove all indentation from the root's children without affecting the display of buttons/lines on deeper items.

Library Script Changes

treectrl.tcl:

The <Left> and <Right> key bindings will collapse and expand the active item if -orient=vertical and -wrap={}. Otherwise the previous behavior of setting the active item to an adjacent item is used.

Bug Fixes

Fixed corruption/crash with ".t column configure -foo" with no option value if -foo is an invalid option.

What's New in TkTreeCtrl 2.2.6

Bug Fixes

Fixed ".t item bbox" returning bogus values when asking for the bounds of a column or element in a list with many items (integer overflow).
Fixed a segfault on Win64 machines when the system theme changed.
Fixed a panic on Win64 when drawing the the marquee and drag-image dotted rectangles due to a too-small struct.

What's New in TkTreeCtrl 2.2.5

Issues regarding the incompatibility of 8.4 built TkTreeCtrl working in 8.5 were resolved. The Mac OS X API issues noted for 2.2.4 remain (they relate to difficult to reconcile core drawing changes).

A Windows DLL manifest is now embedded to address native theme drawing issues.

What's New in TkTreeCtrl 2.2.4

NOTE regarding Tk version compatibility

Under Mac OSX some internal changes to Tk 8.4.15 and Tk 8.4.17 result in incompatibilities:

This version of TkTreeCtrl built for Tk 8.4.15 will work with Tk 8.4.15 and 8.4.16 only (under Mac OSX).
This version of TkTreeCtrl built for Tk 8.4.17 will work with Tk 8.4.17 only (under Mac OSX).

TreeCtrl Configuration Options

New	Comment
-columntagexpr -itemtagexpr	These boolean options can be used to turn off tag expressions in column descriptions and item descriptions. When the val