Tk::HList - Create and manipulate Tix Hierarchial List widgets
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Tk::HList - Create and manipulate Tix Hierarchial List widgets
$hlist = $parent->HList(?options?);
-background | -borderwidth | -cursor | -exportselection
|
-foreground | -font | -height | -highlightcolor
|
-highlightthickness | -relief | -selectbackground
|
-selectforeground | -xscrollcommand | -yscrollcommand
|
-width |
See the Tk::options manpage for details of the standard options.
- Name: browsecmd
- Class: BrowseCmd
- Switch: -browsecmd
-
Specifies a perl/Tk callback to be executed when the user browses through the
entries in the HList widget.
- Name: columns
- Class: Columns
- Switch: -columns
-
Specifies the number of columns in this HList widget. This option can
only be set during the creation of the HList widget and cannot be
changed subsequently.
- Name: command
- Class: Command
- Switch: -command
-
Specifies the perl/Tk callback to be executed when the user invokes a list
entry in the HList widget. Normally the user invokes a list
entry by double-clicking it or pressing the Return key.
- Name: drawBranch
- Class: DrawBranch
- Switch: -drawbranch
-
A Boolean value to specify whether branch line should be drawn to
connect list entries to their parents.
- Name: foreground
- Class: Foreground
- Switch: -foreground
- Alias: -fg
-
[OBSOLETE] Specifies the default foreground color for the list entries.
- Name: gap
- Class: Gap
- Switch: -gap
-
[OBSOLETE] The default distance between the bitmap/image and the
text in list entries.
- Name: header
- Class: Header
- Switch: -header
-
A Boolean value specifying whether headers should be displayed for
this HList widget (see the header method below).
- Name: height
- Class: Height
- Switch: -height
-
Specifies the desired height for the window in number of characters.
- Name: indent
- Class: Indent
- Switch: -indent
-
Specifies the amount of horizontal indentation between a list entry
and its children. Must be a valid screen distance value.
- Name: indicator
- Class: Indicator
- Switch: -indicator
-
Specifies whether the indicators should be displayed inside the HList
widget. See the indicator method below.
- Name: indicatorCmd
- Class: IndicatorCmd
- Switch: -indicatorcmd
-
Specifies a perl/Tk callback to be executed when the user manipulates the
indicator of an HList entry. The -indicatorcmd is triggered
when the user press or releases the mouse button over the indicator in
an HList entry. By default the perl/Tk callback specified by
-indicatorcmd is executed with two additional arguments, the
entryPath of the entry whose indicator has been triggered and additional
information about the event. The additional information is one of the
following strings: <Arm>, <Disarm>,
and <Activate>.
- Name: itemType
- Class: ItemType
- Switch: -itemtype
-
Specifies the default type of display item for this HList widget. When
you call the itemCreate, add and addchild methods, display
items of this
type will be created if the -itemtype option is not specified .
- Name: padX
- Class: Pad
- Switch: -padx
-
[OBSOLETE] The default horizontal padding for list entries.
- Name: padY
- Class: Pad
- Switch: -padx
-
[OBSOLETE] The default vertical padding for list entries.
- Name: selectBackground
- Class: SelectBackground
- Switch: -selectbackground
-
Specifies the background color for the selected list entries.
- Name: selectBorderWidth
- Class: BorderWidth
- Switch: -selectborderwidth
-
Specifies a non-negative value indicating the width of the 3-D border
to draw around selected items. The value may have any of the forms
acceptable to Tk_GetPixels.
- Name: selectForeground
- Class: SelectForeground
- Switch: -selectforeground
-
Specifies the foreground color for the selected list entries.
- Name: selectMode
- Class: SelectMode
- Switch: -selectmode
-
Specifies one of several styles for manipulating the selection. The
value of the option may be arbitrary, but the default bindings expect
it to be either single, browse, multiple, or
extended; the default value is single.
- Name: sizeCmd
- Class: SizeCmd
- Switch: -sizecmd
-
Specifies a perl/Tk callback to be called whenever the HList widget
changes its size. This method can be useful to implement ``user scroll
bars when needed'' features.
- Name: separator
- Class: Separator
- Switch: -separator
-
Specifies the character to used as the separator character when
intepreting the path-names of list entries. By default the character
``.'' is used.
- Name: width
- Class: Width
- Switch: -width
-
Specifies the desired width for the window in characters.
The HList method creates a new window (given by the
$widget argument) and makes it into a HList widget.
Additional options, described above, may be specified on the command
line or in the option database to configure aspects of the
HList widget such as its cursor and relief.
The HList widget can be used to display any data that have a
hierarchical structure, for example, file system directory trees. The
list entries are indented and connected by branch lines according to
their places in the hierachy.
Each list entry is identified by an entryPath. The entryPath is a
sequence of entry names separated by the separator charactor
(specified by the -separator option). An entry name can be
any string that does not contain the separator charactor, or it can be
the a string that contains only one separator charactor.
For example, when ``.'' is used as the separator charactor,
``one.two.three'' is the entryPath for a list entry whose parent is
``one.two'', whose parent is ``one'', which is a toplevel entry (has no
parents).
Another examples: ``.two.three'' is the entryPath for a list entry whose
parent is ``.two'', whose parent is ``.'', which is a toplevel entry.
Each list entry in an HList widget is associated with a display
item. The display item determines what visual information should
be displayed for this list entry. Please see the Tk::DItem manpage
for a list of all display items.
When a list entry is created by the itemCreate, add or
addchild widget
methods, the type of its display item is determined by the
-itemtype option passed to these methods. If the
-itemtype is omitted, then by default the type specified by
this HList widget's -itemtype option is used.
The HList method creates a widget object.
This object supports the configure and cget methods
described in the Tk::options manpage which can be used to enquire and
modify the options described above.
The widget also inherits all the methods provided by the generic
Tk::Widget class.
The following additional methods are available HList widgets:
- $hlist->add($entryPath ?,option=>value, ...?)
-
Creates a new list entry with the pathname $entryPath. A list
entry must be created after its parent is created (unless this entry
is a top-level entry, which has no parent). See also BUGS below.
This method returns the
entryPath of the newly created list entry. The following
configuration options can be given to configure the list entry:
- -at => position
-
Insert the new list at the position given by position.
position must be a valid integer. The position 0 indicates
the first position, 1 indicates the second position, and so on.
- -after => afterWhich
-
Insert the new list entry after the entry identified by
afterWhich. afterWhich must be a valid list entry and it
mush have the same parent as the new list entry
- -before => beforeWhich
-
Insert the new list entry before the entry identified by
beforeWhich. beforeWhich must be a valid list entry and it
mush have the same parent as the new list entry
- -data => string
-
Specifies a string to associate with this list entry. This string can
be queried by the info method. The application
programmer can use the -data option to associate the list entry
with the data it represents.
- -itemtype => type
-
Specifies the type of display item to be display for the new list
entry. type must be a valid display item type. Currently the
available display item types are imagetext, text, and
$widget. If this option is not specified, then by default the
type specified by this HList widget's -itemtype option is used.
- -state => state
-
Specifies whether this entry can be selected or invoked by the user.
Must be either normal or disabled.
The add method accepts additional configuration options
to configure the display item associated with this list entry. The set
of additional configuration options depends on the type of the display
item given by the -itemtype option. Please see
the Tk::DItem manpage for a list of the configuration options for
each of the display item types.
- $hlist->addchild($parentPath, ?option, value, ..., ?)
-
Adds a new child entry to the children list of the list entry
identified by $parentPath. Or, if $parentPath is set to be
the empty string, then creates a new toplevel entry. The name of the
new list entry will be a unique name automatically generated by the
HList widget. Usually if $parentPath is foo, then the
entryPath of the new entry will be foo.0, foo.1, ... etc.
This method returns the entryPath of the newly created list entry.
option can be any option for the add method.
See also BUGS below.
- $hlist->anchorSet($entryPath)
-
Sets the anchor to the list entry identified by $entryPath. The
anchor is the end of the selection that is fixed while the user is
dragging out a selection with the mouse.
- $hlist->anchorClear
-
Removes the anchor, if any, from this HList widget. This only
removes the surrounding highlights of the anchor entry and does not
affect its selection status.
- $hlist->columnWidth($col?, -char?, ?width?)
-
Querys or sets the width of a the column $col in the HList
widget. The value of $col is zero-based: 0 stands for the first
column, 1 stands for the second, and so on. If no further parameters
are given, returns the current width of this column (in number of
pixels). Additional parameters can be given to set the width of this
column:
- $hlist->columnWidth($col, '')
-
An empty string indicates that the width of the column should be just
wide enough to display the widest element in this column. In this
case, the width of this column may change as a result of the elements
in this column changing their sizes.
- $hlist->columnWidth($col, width)
-
width must be in a form accepted by Tk_GetPixels.
- $hlist->columnWidth($col, -char, nChars)
-
The width is set to be the average width occupied by nChars
number of characters of the font specified by the -font option
of this HList widget.
- $hlist->delete(option, $entryPath)
-
Delete one or more list entries. option may be one of the
following:
- all
-
Delete all entries in the HList. In this case the $entryPath
does not need to be specified.
- entry
-
Delete the entry specified by $entryPath and all its offsprings,
if any.
- offsprings
-
Delete all the offsprings, if any, of the entry specified by
$entryPath. However, $entryPath itself is not deleted.
- siblings
-
Delete all the list entries that share the same parent with the entry
specified by $entryPath. However, $entryPath itself is not
deleted.
- $hlist->dragsiteSet($entryPath)
-
Sets the dragsite to the list entry identified by
$entryPath. The dragsite is used to indicate the source of a
drag-and-drop action. Currently drag-and-drop functionality has not
been implemented in Tix yet.
- $hlist->dragsiteClear
-
Remove the dragsite, if any, from the this HList widget. This only
removes the surrounding highlights of the dragsite entry and does not
affect its selection status.
- $hlist->dropsiteSet($entryPath)
-
Sets the dropsite to the list entry identified by $entryPath. The
dropsite is used to indicate the target of a drag-and-drop
action. Currently drag-and-drop functionality has not been implemented
in Tix yet.
- $hlist->dropsiteClear
-
Remove the dropsite, if any, from the this HList widget. This only
removes the surrounding highlights of the dropsite entry and does not
affect its selection status.
- $hlist->entrycget($entryPath, option)
-
Returns the current value of the configuration option given by
option for the entry indentfied by $entryPath. Option
may have any of the values accepted by the add method.
- $hlist->entryconfigure($entryPath ?,option?, ?value=>option, ...?)
-
Query or modify the configuration options of the list entry indentfied
by $entryPath. If no option is specified, returns a list
describing all of the available options for $entryPath (see
the Tk::options manpage for information on the format of this list.) If
option is specified with no value, then the method
returns a list describing the one named option (this list will be
identical to the corresponding sublist of the value returned if no
option is specified). If one or more option-value pairs
are specified, then the method modifies the given
option(s)
to have
the given value(s); in this case the method returns an empty string.
Option may have any of the values accepted by the add or
addchild method. The exact set of options depends on the
value of the -itemtype option passed to the the add or
addchild method when this list entry is created.
- $hlist->header(option, $col ?,args, ...?)
-
Manipulates the header items of this HList widget. If the
-header option of this HList widget is set to true, then a
header item is displayed at the top of each column. The $col
argument for this method must be a valid integer. 0 indicates the
first column, 1 the second column, ... and so on. This method
supports the following options:
- $hlist->header(cget, $col, option)
-
If the $col-th column has a header display item, returns the
value of the specified option of the header item. If the header
doesn't exist, returns an error.
- $hlist->header(configure, $col, ?option?, ?value, option, value, ...?)
-
Query or modify the configuration options of the header display item
of the $col-th column. The header item must exist, or an error
will result. If no option is specified, returns a list
describing all of the available options for the header display item
(see the Tk::options manpage for information on the format of this
list.) If option is specified with no value, then the
method returns a list describing the one named option (this list will
be identical to the corresponding sublist of the value returned if no
option is specified). If one or more option-value pairs
are specified, then the method modifies the given
option(s)
to have
the given value(s); in this case the method returns an empty
string. Option may have any of the values accepted by the
header create method. The exact set of options depends
on the value of the -itemtype option passed to the the header
create method when this display item was created.
- $hlist->header(create, $col, ?-itemtype type? ?option value ...?
-
Creates a new display item as the header for the $col-th
column. See also BUGS below.
If an header display item already exists for this column, it
will be replaced by the new item. An optional parameter
-itemtype can be used to specify what type of display item
should be created. If the -itemtype is not given, then by
default the type specified by this HList widget's -itemtype
option is used. Additional parameters, in option-value pairs,
can be passed to configure the appearance of the display item. Each
option-value pair must be a valid option for this type of
display item or one of the following:
- -borderwidth => color
-
Specifies the border width of this header item.
- -headerbackground => color
-
Specifies the background color of this header item.
- -relief => type
-
Specifies the relief type of the border of this header item.
- $hlist->header(delete, $col)
-
Deletes the header display item for the $col-th column.
- $hlist->header(exists, $col)
-
Return true if an header display item exists for the $col-th
column; return false otherwise.
- $hlist->header(size, $entryPath)
-
If an header display item exists for the $col-th column , returns
its size in pixels in a two element list (width, height);
returns an error if the header display item does not exist.
- $hlist->hide(option ?,$entryPath?)
-
Makes some of entries invisible without deleting them.
Option can be one of the following:
- entry
-
Hides the list entry identified by $entryPath.
Currently only the entry option is supported. Other options will
be added in the next release.
- $hlist->indicator(option, $entryPath, ?args, ...?)
-
Manipulates the indicator on the list entries. An indicator is usually
a small display item (such as an image) that is displayed to the left
to an entry to indicate the status of the entry. For example, it may
be used to indicate whether a directory is opened or
closed. Option can be one of the following:
- $hlist->indicator(cget, $entryPath, option)
-
If the list entry given by $entryPath has an indicator, returns
the value of the specified option of the indicator. If the
indicator doesn't exist, returns an error.
- $hlist->indicator(configure, $entryPath, ?option?, ?value, option, value, ...?)
-
Query or modify the configuration options of the indicator display
item of the entry specified by $entryPath. The indicator item
must exist, or an error will result. If no option is specified,
returns a list describing all of the available options for the
indicator display item (see the Tk::options manpage for information
on the format of this list). If option is specified with no
value, then the method returns a list describing the one named
option (this list will be identical to the corresponding sublist of
the value returned if no option is specified). If one or more
option-value pairs are specified, then the method modifies the
given
option(s)
to have the given value(s); in this case the method
returns an empty string. Option may have any of the values
accepted by the indicator create method. The exact set
of options depends on the value of the -itemtype option passed
to the the indicator create method when this display item
was created.
- $hlist->indicator(create, $entryPath, ?, -itemtype type? ?option value ...?)
-
Creates a new display item as the indicator for the entry specified by
$entryPath. If an indicator display item already exists for this
entry, it will be replaced by the new item. An optional parameter
-itemtype can be used to specify what type of display item
should be created. If the -itemtype is not given, then by
default the type specified by this HList widget's -itemtype
option is used. Additional parameters, in option-value pairs,
can be passed to configure the appearance of the display item. Each
option-value pair must be a valid option for this type of
display item.
- $hlist->indicator(delete, $entryPath)
-
Deletes the indicator display item for the entry given by $entryPath.
- $hlist->indicator(exists, $entryPath)
-
Return true if an indicator display item exists for the entry given by
$entryPath; return false otherwise.
- $hlist->indicator(size, $entryPath)
-
If an indicator display item exists for the entry given by
$entryPath, returns its size in a two element list of the form
{width height}; returns an error if the indicator display item
does not exist.
- $hlist->info(option, arg, ...)
-
Query information about the HList widget. option can be one
of the following:
- $hlist->info(anchor)
-
Returns the entryPath of the current anchor, if any, of the HList
widget. If the anchor is not set, returns the empty string.
- $hlist->infoBbox($entryPath)
-
Returns a list of four numbers describing the visible bounding box of
the entry given $entryPath. The first two elements of the list
give the x and y coordinates of the upper-left corner of the screen
area covered by the entry (specified in pixels relative to the widget)
and the last two elements give the lower-right corner of the area, in
pixels. If no part of the entry given by index is visible on the
screen then the result is an empty string; if the entry is partially
visible, the result gives the only the visible area of the entry.
- $hlist->info(children ?,$entryPath?)
-
If $entryPath is given, returns a list of the entryPath's of its
children entries. Otherwise returns a list of the toplevel
entryPath's.
- $hlist->info(data ?,$entryPath?)
-
Returns the data associated with $entryPath.
- $hlist->info(dragsite)
-
Returns the entryPath of the current dragsite, if any, of the HList
widget. If the dragsite is not set, returns the empty string.
- $hlist->info(dropsite)
-
Returns the entryPath of the current dropsite, if any, of the HList
widget. If the dropsite is not set, returns the empty string.
- $hlist->info(exists, $entryPath)
-
Returns a boolean value indicating whether the list entry
$entryPath exists.
- $hlist->info(hidden, $entryPath)
-
Returns a boolean value indicating whether the list entry
$entryPath is hidden or not.
- $hlist->info(next, $entryPath)
-
Returns the entryPath of the list entry, if any, immediately below
this list entry. If this entry is already at the bottom of the HList
widget, returns an empty string.
- $hlist->info(parent, $entryPath)
-
Returns the name of the parent of the list entry identified by
$entryPath. If entryPath is a toplevel list entry,
returns the empty string.
- $hlist->info(prev, $entryPath)
-
Returns the entryPath of the list entry, if any, immediately above
this list entry. If this entry is already at the top of the HList
widget, returns an empty string.
- $hlist->info(selection)
-
Returns a list of selected entries in the HList widget. If no entries
are selected, returns an empty string.
- $hlist->item(option, ?args, ...?)
-
Creates and configures the display items at individual columns the
entries. The form of additional of arguments depends on the choice of
option:
- $hlist->itemCget($entryPath, $col, option)
-
Returns the current value of the configure option of the display
item at the column designated by $col of the entry specified by
$entryPath.
- $hlist->itemConfigure($entryPath, $col ?,option?, ?value, option, value, ...?)
-
Query or modify the configuration options of the display item at the
column designated by $col of the entry specified by
$entryPath. If no option is specified, returns a list
describing all of the available options for $entryPath (see
the Tk::options manpage for information on the format of this
list). If option is specified with no value, then the
method returns a list describing the one named option (this list will
be identical to the corresponding sublist of the value returned if no
option is specified). If one or more option-value pairs
are specified, then the method modifies the given
option(s)
to have
the given value(s); in this case the method returns an empty string.
Option may have any of the values accepted by the item
create method. The exact set of options depends on the
value of the -itemtype option passed to the the item
create method when this display item was created.
- $hlist->itemCreate($entryPath, $col ?,-itemtype=>type? ?,option value ...?)
-
Creates a new display item at the column designated by $col of
the entry specified by $entryPath. An optional parameter
-itemtype can be used to specify what type of display items
should be created. If the -itemtype is not specified, then by
default the type specified by this HList widget's -itemtype
option is used. Additional parameters, in option-value pairs,
can be passed to configure the appearance of the display item. Each
option- value pair must be a valid option for this type of
display item.
- $hlist->itemDelete($entryPath, $col)
-
Deletes the display item at the column designated by $col of
the entry specified by $entryPath.
- $hlist->itemExists($entryPath, $col)
-
Returns true if there is a display item at the column designated by
$col of the entry specified by $entryPath; returns false
otherwise.
- $hlist->nearest(y)
-
$hlist->nearest(y)
Given a y-coordinate within the HList window, this method returns
the entryPath of the (visible) HList element nearest to that
y-coordinate.
- $hlist->see($entryPath)
-
Adjust the view in the HList so that the entry given by $entryPath is
visible. If the entry is already visible then the method has no
effect; if the entry is near one edge of the window then the HList
scrolls to bring the element into view at the edge; otherwise the
HList widget scrolls to center the entry.
- $hlist->selection(option, arg, ...)
- $hlist->selectionOption(arg, ...)
-
This method is used to adjust the selection within a HList widget. It
has several forms, depending on option:
- $hlist->selectionClear(?from?, ?to?)
-
When no extra arguments are given, deselects all of the list
entrie(s)
in this HList widget. When only from is given, only the list
entry identified by from is deselected. When both from and
to are given, deselects all of the list entrie(s)
between
between from and to, inclusive, without affecting the
selection state of elements outside that range.
- $hlist->selectionGet
-
This is an alias for the infoSelection method.
- $hlist->selectionIncludes($entryPath)
-
Returns 1 if the list entry indicated by $entryPath is currently
selected; returns 0 otherwise.
- $hlist->selectionSet(from?, to?)
-
Selects all of the list
entrie(s)
between between from and
to, inclusive, without affecting the selection state of entries
outside that range. When only from is given, only the list entry
identified by from is selected.
- $hlist->show(option ?,$entryPath?)
-
Show the entries that are hidden by the hide method,
option can be one of the following:
- entry
-
Shows the list entry identified by $entryPath.
Currently only the entry option is supported. Other options will
be added in future releases.
- $hlist->xview(args)
-
This method is used to query and change the horizontal position of the
information in the widget's window. It can take any of the following
forms:
- $hlist->xview
-
Returns a list containing two elements. Each element is a real
fraction between 0 and 1; together they describe the horizontal span
that is visible in the window. For example, if the first element is
.2 and the second element is .6, 20% of the HList entry is
off-screen to the left, the middle 40% is visible in the window, and
40% of the entry is off-screen to the right. These are the same values
passed to scrollbars via the -xscrollcommand option.
- $hlist->xview($entryPath)
-
Adjusts the view in the window so that the list entry identified by
$entryPath is aligned to the left edge of the window.
- $hlist->xview(moveto => fraction)
-
Adjusts the view in the window so that fraction of the total
width of the HList is off-screen to the left. fraction must be
a fraction between 0 and 1.
- $hlist->xview(scroll => number, what)
-
This method shifts the view in the window left or right according to
number and what. Number must be an integer.
What must be either units or pages or an
abbreviation of one of these. If what is units, the view
adjusts left or right by number character units (the width of
the 0 character) on the display; if it is pages then the
view adjusts by number screenfuls. If number is negative
then characters farther to the left become visible; if it is positive
then characters farther to the right become visible.
- $hlist->yview(?args?)
-
This method is used to query and change the vertical position of the
entries in the widget's window. It can take any of the following forms:
- $hlist->yview
-
Returns a list containing two elements, both of which are real
fractions between 0 and 1. The first element gives the position of
the list element at the top of the window, relative to the HList as a
whole (0.5 means it is halfway through the HList, for example). The
second element gives the position of the list entry just after the
last one in the window, relative to the HList as a whole. These are
the same values passed to scrollbars via the -yscrollcommand
option.
- $hlist->yview($entryPath)
-
Adjusts the view in the window so that the list entry given by
$entryPath is displayed at the top of the window.
- $hlist->yview(moveto => fraction)
-
Adjusts the view in the window so that the list entry given by
fraction appears at the top of the window. Fraction is a
fraction between 0 and 1; 0 indicates the first entry in the
HList, 0.33 indicates the entry one-third the way through the
HList, and so on.
- $hlist->yview(scroll => number, what)
-
This method adjust the view in the window up or down according to
number and what. Number must be an integer.
What must be either units or pages. If what
is units, the view adjusts up or down by number lines; if
it is pages then the view adjusts by number screenfuls.
If number is negative then earlier entries become visible; if
it is positive then later entries become visible.
- [1]
-
If the -selectmode is ``browse'', when the user drags the mouse
pointer over the list entries, the entry under the pointer will be
highlighted and the -browsecmd callback will be called with
one parameter, the entryPath of the highlighted entry. Only one entry
can be highlighted at a time. The -command callback will be
called when the user double-clicks on a list entry.
- [2]
-
If the -selectmode is ``single'', the entries will only be
highlighted by mouse <ButtonRelease-1> events. When a new list entry
is highlighted, the -browsecmd callback will be called with
one parameter indicating the highlighted list entry. The
-command callback will be called when the user double-clicks
on a list entry.
- [3]
-
If the -selectmode is ``multiple'', when the user drags the mouse
pointer over the list entries, all the entries under the pointer will
be highlighted. However, only a contiguous region of list entries can
be selected. When the highlighted area is changed, the
-browsecmd callback will be called with an undefined
parameter. It is the responsibility of the -browsecmd callback
to find out the exact highlighted selection in the HList. The
-command callback will be called when the user double-clicks
on a list entry.
- [4]
-
If the -selectmode is ``extended'', when the user drags the mouse
pointer over the list entries, all the entries under the pointer will
be highlighted. The user can also make disjointed selections using
<Control-ButtonPress-1>. When the highlighted area is changed, the
-browsecmd callback will be called with an undefined
parameter. It is the responsibility of the -browsecmd callback
to find out the exact highlighted selection in the HList. The
-command callback will be called when the user double-clicks
on a list entry.
- [5]
-
Arrow key bindings: <Up> arrow key moves the anchor point to the
item right on top of the current anchor item. <Down> arrow key moves
the anchor point to the item right below the current anchor item.
<Left> arrow key moves the anchor to the parent item of the current
anchor item. <Right> moves the anchor to the first child of the
current anchor item. If the current anchor item does not have any
children, moves the anchor to the item right below the current anchor
item.
This example demonstrates how to use an HList to store a file
directory structure and respond to the user's browse events:
use strict;
use Tk;
use Tk::Label;
use Tk::HList;
my $mw = MainWindow->new();
my $label = $mw->Label(-width=>15);
my $hlist = $mw->HList(
-itemtype => 'text',
-separator => '/',
-selectmode => 'single',
-browsecmd => sub {
my $file = shift;
$label->configure(-text=>$file);
}
);
foreach ( qw(/ /home /home/ioi /home/foo /usr /usr/lib) ) {
$hlist->add($_, -text=>$_);
}
$hlist->pack;
$label->pack;
MainLoop;
The fact that the display item at column 0 is implicitly associated
with the whole entry is probably a design bug. This was done for
backward compatibility purposes. The result is that there is a large
overlap between the item method and the add,
addchild, entrycget and entryconfigure
methods. Whenever multiple columns exist, the programmer should use
ONLY the item method to create and configure the display items
in each column; the add, addchild, entrycget and
entryconfigure should be used ONLY to create and configure
entries.
Hierarchical Listbox
Tk::DItem
Tk::HList - Create and manipulate Tix Hierarchial List widgets
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