treeview

Section: BLT Built-In Commands (n)
Updated: 2.4
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NAME

treeview - Create and manipulate hierarchical table widgets

SYNOPSIS

treeview pathName ?options?

DESCRIPTION

The treeview widget displays a tree of data. It replaces both the hiertable and hierbox widgets. The treeview is 100% syntax compatible with the hiertable widget. The hiertable command is retained for sake of script-level compatibility. This widget obsoletes the hierbox widget. It does everything the old hierbox widget did, but also provides data sharing (via tree data objects) and the ability to tag nodes.

INTRODUCTION

The treeview widget displays hierarchical data. Data is represented as nodes in a general-ordered tree. Each node may have sub-nodes and these nodes can in turn has their own children.

A node is displayed as a row entry in the widget. Each entry has a text label and icon. When a node has children, its entry is drawn with a small button to the left of the label. Clicking the mouse over this button opens or closes the node. When a node is open, its children are exposed. When it is closed, the children and their descendants are hidden. The button is normally a + or - symbol (ala Windows Explorer), but can be replaced with a pair of Tk images (open and closed images).

If the node has data associated with it, they can be displayed in columns running vertically on either side the tree. You can control the color, font, etc of each entry. Any entry label or data field can be edited in-place.

TREE DATA OBJECT

The tree is not stored inside the widget but in a tree data object (see the tree command for a further explanation). Tree data objects can be shared among different clients, such as a treeview widget or the tree command. You can walk the tree and manage its data with the tree command tree, while displaying it with the treeview widget. Whenever the tree is updated, the treeview widget is automatically redrawn.

By default, the treeview widget creates its own tree object. The tree initially contains just a root node. But you can also display trees created by the tree command using the -tree configuration option. Treeview widgets can share the same tree object, possibly displaying different views of the same data.

A tree object has both a Tcl and C API. You can insert or delete nodes using treeview widget or tree command operations, but also from C code. For example, you can load the tree from your C code while still managing and displaying the tree from Tcl. The widget is automatically notified whenever the tree is modified via C or Tcl.

SYNTAX


treeview pathName ?option value?...

The treeview command creates a new window pathName and makes it into a treeview widget. At the time this command is invoked, there must not exist a window named pathName, but pathName's parent must exist. Additional options may be specified on the command line or in the option database to configure aspects of the widget such as its colors and font. See the configure operation below for the exact details about what option and value pairs are valid.

If successful, treeview returns the path name of the widget. It also creates a new Tcl command by the same name. You can use this command to invoke various operations that query or modify the widget. The general form is:


pathName operation ?arg?...

Both operation and its arguments determine the exact behavior of the command. The operations available are described in the "TREEVIEW OPERATIONS" section.

IDS AND TAGS

Nodes can be inserted into a tree using the treeview widget



blt::treeview .t
set node [.t insert end root "one"]

or tree command.



set tree [blt::tree create]
set node [$tree insert root "one"]

In both cases, a number identifying the node is returned (the value of $node). This serial number or id uniquely identifies the node. Please note that you can't infer a location or position of a node from its id. The only exception is that the root node is always id 0. Since nodes may have the same labels or be moved within the tree, ids provide an convenient way to identify nodes. If a tree is shared, the ids will be the same regardless if you are using by the treeview widget or the tree command. Ids are recycled when the node deleted.

A node may also have any number of tags associated with it. A tag is just a string of characters, and it may take any form except that of an integer. For example, "x123" is valid, but "123" isn't. The same tag may be associated with many different nodes. This is typically done to associate a group of nodes. Many operations in the treeview widget take either node ids or tag names as arguments. Using a tag says to apply the operation to all nodes with that tag.

The tag all is implicitly associated with every node in the tree. It may be used to invoke operations on all the nodes in the tree.

Tags may be shared, just like trees, between clients. For example, you can use the tags created by the tree command with treeview widgets.

SPECIAL NODE IDS

There are also several special non-numeric ids. Special ids differ from tags in that they are always translated to their numeric equivalent. They also take precedence over tags. For example, you can't use a tag name that is a special id. These ids are specific to the treeview widget.

active: The node where the mouse pointer is currently located. When a node is active, it is drawn using its active icon (see the -activeicon option). The active id is changed automatically by moving the mouse pointer over another node or by using the entry activate operation. Note that there can be only one active node at a time.
anchor: The node representing the fixed end of the current selection. The anchor is set by the selection anchor operation.
current: The node where the mouse pointer is currently located. But unlike active, this id changes while the selection is dragged. It is used to determine the current node during button drags.
down: The next open node from the current focus. The down of the last open node is the same.
end: The last open node (in depth-first order) on the tree.
focus: The node that currently has focus. When a node has focus, it receives key events. To indicate focus, the node is drawn with a dotted line around its label. You can change the focus using the focus operation.
last: The last open node from the current focus. But unlike up, when the focus is at root, last wraps around to the last open node in the tree.
mark: The node representing the non-fixed end of the current selection. The mark is set by the selection mark operation.
next: The next open node from the current focus. But unlike down, when the focus is on last open node, next wraps around to the root node.
nextsibling: The next sibling from the node with the current focus. If the node is already the last sibling then it is the nextsibling.
parent: The parent of the node with the current focus. The parent of the root is also the root.
prevsibling: The previous sibling from the node with the current focus. If the node is already the first sibling then it is the prevsibling.
root: The root node. You can also use id 0 to indicate the root.
up: The last open node (in depth-first order) from the current focus. The up of the root node (i.e. the root has focus) is also the root.
view.top: First node that's current visible in the widget.
view.bottom: Last node that's current visible in the widget.
path: Absolute path of a node. Path names refer to the node name, not their entry labels. Paths don't have to start with a separator (see the -separator configuration option), but component names must be separated by the designated separator.
@x,y: Indicates the node that covers the point in the treeview window specified by x and y (in pixel coordinates). If no part of the entryd covers that point, then the closest node to that point is used.

A node may be specified as an id or tag. If the specifier is an integer then it is assumed to refer to the single node with that id. If the specifier is not an integer, it's checked to see if it's a special id (such as focus). Otherwise, it's assumed to be tag. Some operations only operate on a single node at a time; if a tag refers to more than one node, then an error is generated.

DATA FIELDS

A node in the tree can have data fields. A data field is a name-value pair, used to represent arbitrary data in the node. Nodes can contain different fields (they aren't required to contain the same fields). You can optionally display these fields in the treeview widget in columns running on either side of the displayed tree. A node's value for the field is drawn in the column along side its node in the hierarchy. Any node that doesn't have a specific field is left blank. Columns can be interactively resized, hidden, or, moved.

ENTRY BINDINGS

You can bind Tcl commands to be invoked when events occur on nodes (much like Tk canvas items). You can bind a node using its id or its bindtags. Bindtags are simply names that associate a binding with one or more nodes. There is a built-in tag all that all node entries automatically have.

TREEVIEW OPERATIONS

The treeview operations are the invoked by specifying the widget's pathname, the operation, and any arguments that pertain to that operation. The general form is:



pathName operation ?arg arg ...?

Operation and the args determine the exact behavior of the command. The following operation are available for treeview widgets:

pathName bbox ?-screen? tagOrId...

Returns a list of 4 numbers, representing a bounding box of around the specified entries. The entries is given by one or more tagOrId arguments. If the -screen flag is given, then the x-y coordinates of the bounding box are returned as screen coordinates, not virtual coordinates. Virtual coordinates start from 0 from the root node. The returned list contains the following values.

x: X-coordinate of the upper-left corner of the bounding box.
y: Y-coordinate of the upper-left corner of the bounding box.
width: Width of the bounding box.
height: Height of the bounding box.

pathName bind tagName ?sequence command?

Associates command with tagName such that whenever the event sequence given by sequence occurs for a node with this tag, command will be invoked. The syntax is similar to the bind command except that it operates on treeview entries, rather than widgets. See the bind manual entry for complete details on sequence and the substitutions performed on command before invoking it.

If all arguments are specified then a new binding is created, replacing any existing binding for the same sequence and tagName. If the first character of command is + then command augments an existing binding rather than replacing it. If no command argument is provided then the command currently associated with tagName and sequence (it's an error occurs if there's no such binding) is returned. If both command and sequence are missing then a list of all the event sequences for which bindings have been defined for tagName.

pathName button operation ?args?

This command is used to control the button selectors within a treeview widget. It has several forms, depending on operation:

pathName button activate tagOrId: Designates the node given by tagOrId as active. When a node is active it's entry is drawn using its active icon (see the -activeicon option). Note that there can be only one active entry at a time. The special id active indicates the currently active node.
pathName button bind tagName ?sequence command?: Associates command with tagName such that whenever the event sequence given by sequence occurs for an button of a node entry with this tag, command will be invoked. The syntax is similar to the bind command except that it operates on treeview buttons, rather than widgets. See the bind manual entry for complete details on sequence and the substitutions performed on command before invoking it.
If all arguments are specified then a new binding is created, replacing any existing binding for the same sequence and tagName. If the first character of command is + then command augments an existing binding rather than replacing it. If no command argument is provided then the command currently associated with tagName and sequence (it's an error occurs if there's no such binding) is returned. If both command and sequence are missing then a list of all the event sequences for which bindings have been defined for tagName.
pathName button cget option: Returns the current value of the configuration option given by option. Option may have any of the values accepted by the configure operation described below.
pathName button configure ?option? ?value option value ...?: Query or modify the configuration options of the widget. If no option is specified, returns a list describing all of the available options for pathName (see Tk_ConfigureInfo for information on the format of this list). If option is specified with no value, then the command 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 command modifies the given widget option(s) to have the given value(s); in this case the command returns an empty string. Option and value are described in the section "BUTTON OPTIONS" below.

pathName cget option

Returns the current value of the configuration option given by option. Option may have any of the values accepted by the configure operation described below.

pathName close ?-recurse? tagOrId...

Closes the node specified by tagOrId. In addition, if a Tcl script was specified by the -closecommand option, it is invoked. If the node is already closed, this command has no effect. If the -recurse flag is present, each child node is recursively closed.

pathName column operation ?args?

The following operations are available for treeview columns.

pathName column activate column: Sets the active column to column. Column is the name of a column in the widget. When a column is active, it's drawn using its -activetitlebackground and -activetitleforeground options. If column is the "", then no column will be active. If no column argument is provided, then the name of the currently active column is returned.
pathName column cget name option: Returns the current value of the column configuration option given by option for name. Name is the name of column that corresponds to a data field. Option may have any of the values accepted by the configure operation described below.
pathName column configure name ?option? ?value option value ...?: Query or modify the configuration options of the column designated by name. Name is the name of the column corresponding to a data field. If no option is specified, returns a list describing all of the available options for pathName (see Tk_ConfigureInfo for information on the format of this list). If option is specified with no value, then the command 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 command modifies the given widget option(s) to have the given value(s); in this case the command returns an empty string. Option and value are described in the section "COLUMN OPTIONS" below.
pathName column delete field ?field...?: Deletes one of more columns designated by field. Note that this does not delete the data fields themselves.
pathName column insert position field ?options...?: Inserts one of more columns designated by field. A column displays each node's data field by the same name. If the node doesn't have the given field, the cell is left blank. Position indicates where in the list of columns to add the new column. It may be either a number or end.
pathName column invoke field: Invokes the Tcl command associated with the column field, if there is one (using the column's -command option). The command is ignored if the column's -state option set to disabled.
pathName column move name dest: Moves the column name to the destination position. Dest is the name of another column or a screen position in the form @x,y.
pathName column names: Returns a list of the names of all columns in the widget. The list is ordered as the columns are drawn from left-to-right.
pathName column nearest x ?y?: Returns the name of the column closest to the given X-Y screen coordinate. If you provide a y argument (it's optional), a name is returned only when if the point is over a column's title.

pathName configure ?option? ?value option value ...?

Query or modify the configuration options of the widget. If no option is specified, returns a list describing all of the available options for pathName (see Tk_ConfigureInfo for information on the format of this list). If option is specified with no value, then the command 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 command modifies the given widget option(s) to have the given value(s); in this case the command returns an empty string. Option and value are described in the section "TREEVIEW OPTIONS" below.

pathName curselection

Returns a list containing the ids of all of the entries that are currently selected. If there are no entries selected, then the empty string is returned.

pathName delete tagOrId...

Deletes one or more entries given by tagOrId and its children.

pathName entry operation ?args?

The following operations are available for treeview entries.

pathName entry activate tagOrId: Sets the active entry to the one specified by tagOrId. When an entry is active it is drawn using its active icon (see the -activeicon option). Note that there can be only one active node at a time. The special id of the currently active node is active.
pathName entry cget option: Returns the current value of the configuration option given by option. Option may have any of the values accepted by the configure operation described below.
pathName entry children tagOrId ?first? ?last?: Returns a list of ids for the given range of children of tagOrId. TagOrId is the id or tag of the node to be examined. If only a first argument is present, then the id of the that child at that numeric position is returned. If both first and last arguments are given, then the ids of all the children in that range are returned. Otherwise the ids of all children are returned.
pathName entry configure ?option? ?value option value ...?: Query or modify the configuration options of the widget. If no option is specified, returns a list describing all of the available options for pathName (see Tk_ConfigureInfo for information on the format of this list). If option is specified with no value, then the command 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 command modifies the given widget option(s) to have the given value(s); in this case the command returns an empty string. Option and value are described below:
pathName entry delete tagOrId ?first ?last?: Deletes the one or more children nodes of the parent tagOrId. If first and last arguments are present, they are positions designating a range of children nodes to be deleted.
pathName entry isbefore tagOrId1 tagOrId2: Returns 1 if tagOrId1 is before tagOrId2 and 0 otherwise.
pathName entry ishidden tagOrId: Returns 1 if the node is currently hidden and 0 otherwise. A node is also hidden if any of its ancestor nodes are closed or hidden.
pathName entry isopen tagOrId: Returns 1 if the node is currently open and 0 otherwise.
pathName entry size -recurse tagOrId: Returns the number of children for parent node tagOrId. If the -recurse flag is set, the number of all its descendants is returned. The node itself is not counted.

pathName find ?flags? first last

Finds for all entries matching the criteria given by flags. A list of ids for all matching nodes is returned. First and last are ids designating the range of the search in depth-first order. If last is before first, then nodes are searched in reverse order. The valid flags are:

-name pattern

Specifies pattern to match against node names.

-full pattern

Specifies pattern to match against node pathnames.

-option pattern

Specifies pattern to match against the node entry's configuration option.

-exact

Patterns must match exactly. The is the default.

-glob

Use global pattern matching. Matching is done in a fashion similar to that used by the C-shell. For the two strings to match, their contents must be identical except that the following special sequences may appear in pattern:

*: Matches any sequence of characters in string, including a null string.
?: Matches any single character in string.
[chars]: Matches any character in the set given by chars. If a sequence of the form x-y appears in chars, then any character between x and y, inclusive, will match.
\x: Matches the single character x. This provides a way of avoiding the special interpretation of the characters *?[]\ in the pattern.

-regexp

Use regular expression pattern matching (i.e. the same as implemented by the regexp command).

-nonmatching

Pick entries that don't match.

-exec string

Specifies a Tcl script to be invoked for each matching node. Percent substitutions are performed on string before it is executed. The following substitutions are valid:

%W: The pathname of the widget.
%p: The name of the node.
%P: The full pathname of the node.
%#: The id of the node.
%%: Translates to a single percent.

-count number

Stop searching after number matches.

--

Indicates the end of flags.

pathName focus tagOrId

Sets the focus to the node given by tagOrId. When a node has focus, it can receive keyboard events. The special id focus designates the node that currently has focus.

pathName get ?-full? tagOrId tagOrId...

Translates one or more ids to their node entry names. It returns a list of names for all the ids specified. If the -full flag is set, then the full pathnames are returned.

pathName hide ?flags? tagOrId...

Hides all nodes matching the criteria given by flags. The search is performed recursively for each node given by tagOrId. The valid flags are described below:

-name pattern

Specifies pattern to match against node names.

-full pattern

Specifies pattern to match against node pathnames.

-option pattern

Specifies pattern to match against the node entry's configuration option.

-exact

Match patterns exactly. The is the default.

-glob

*: Matches any sequence of characters in string, including a null string.
?: Matches any single character in string.
[chars]: Matches any character in the set given by chars. If a sequence of the form x-y appears in chars, then any character between x and y, inclusive, will match.
\x: Matches the single character x. This provides a way of avoiding the special interpretation of the characters *?[]\ in the pattern.

-regexp

Use regular expression pattern matching (i.e. the same as implemented by the regexp command).

-nonmatching

Hide nodes that don't match.

--

Indicates the end of flags.

pathName index ?-at tagOrId? string

Returns the id of the node specified by string. String may be a tag or node id. Some special ids are normally relative to the node that has focus. The -at flag lets you select another node.

pathName insert ?-at tagOrId? position path ?options...? ?path? ?options...?

Inserts one or more nodes at position. Position is the location (number or end) where the new nodes are added to the parent node. Path is the pathname of the new node. Pathnames can be formated either as a Tcl list (each element is a path component) or as a string separated by a special character sequence (using the -separator option). Pathnames are normally absolute, but the -at switch lets you select a relative starting point. Its value is the id of the starting node.

All ancestors of the new node must already exist, unless the -autocreate option is set. It is also an error if a node already exists, unless the -allowduplicates option is set.

Option and value may have any of the values accepted by the entry configure operation described in the "ENTRY OPERATIONS" section below. This command returns a list of the ids of the new entries.

pathName move tagOrId how destId

Moves the node given by tagOrId to the destination node. The node can not be an ancestor of the destination. DestId is the id of the destination node and can not be the root of the tree. In conjunction with how, it describes how the move is performed.

before: Moves the node before the destination node.
after: Moves the node after the destination node.
into: Moves the node to the end of the destination's list of children.

pathName nearest x y ?varName?

Returns the id of the node entry closest to the given X-Y screen coordinate. The optional argument varName is the name of variable which is set to either button or select to indicate over what part of the node the coordinate lies. If the coordinate is not directly over any node, then varName will contain the empty string.

pathName open ?-recurse? tagOrId...

Opens the one or more nodes specified by tagOrId. If a node is not already open, the Tcl script specified by the -opencommand option is invoked. If the -recurse flag is present, then each descendant is recursively opened.

pathName range ?-open? first last

Returns the ids in depth-first order of the nodes between the first and last ids. If the -open flag is present, it indicates to consider only open nodes. If last is before first, then the ids are returned in reverse order.

pathName scan option args

This command implements scanning. It has two forms, depending on option:

pathName scan mark x y: Records x and y and the current view in the treeview window; used in conjunction with later scan dragto commands. Typically this command is associated with a mouse button press in the widget. It returns an empty string.
pathName scan dragto x y.: Computes the difference between its x and y arguments and the x and y arguments to the last scan mark command for the widget. It then adjusts the view by 10 times the difference in coordinates. This command is typically associated with mouse motion events in the widget, to produce the effect of dragging the list at high speed through the window. The return value is an empty string.

pathName see ?-anchor anchor? tagOrId

Adjusts the view of entries so that the node given by tagOrId is visible in the widget window. It is an error if tagOrId is a tag that refers to more than one node. By default the node's entry is displayed in the middle of the window. This can changed using the -anchor flag. Its value is a Tk anchor position.

pathName selection option arg

This command is used to adjust the selection within a treeview widget. It has several forms, depending on option:

pathName selection anchor tagOrId: Sets the selection anchor to the node given by tagOrId. If tagOrId refers to a non-existent node, then the closest node is used. The selection anchor is the end of the selection that is fixed while dragging out a selection with the mouse. The special id anchor may be used to refer to the anchor node.
pathName selection cancel: Clears the temporary selection of entries back to the current anchor. Temporary selections are created by the selection mark operation.
pathName selection clear first ?last?: Removes the entries between first and last (inclusive) from the selection. Both first and last are ids representing a range of entries. If last isn't given, then only first is deselected. Entries outside the selection are not affected.
pathName selection clearall: Clears the entire selection.
pathName selection mark tagOrId: Sets the selection mark to the node given by tagOrId. This causes the range of entries between the anchor and the mark to be temporarily added to the selection. The selection mark is the end of the selection that is fixed while dragging out a selection with the mouse. The special id mark may be used to refer to the current mark node. If tagOrId refers to a non-existent node, then the mark is ignored. Resetting the mark will unselect the previous range. Setting the anchor finalizes the range.
pathName selection includes tagOrId: Returns 1 if the node given by tagOrId is currently selected, 0 if it isn't.
pathName selection present: Returns 1 if any nodes are currently selected and 0 otherwise.
pathName selection set first ?last?: Selects all of the nodes in the range between first and last, inclusive, without affecting the selection state of nodes outside that range.
pathName selection toggle first ?last?: Selects/deselects nodes in the range between first and last, inclusive, from the selection. If a node is currently selected, it becomes deselected, and visa versa.

pathName show ?flags? tagOrId...

Exposes all nodes matching the criteria given by flags. This is the inverse of the hide operation. The search is performed recursively for each node given by tagOrId. The valid flags are described below:

-name pattern

Specifies pattern to match against node names.

-full pattern

Specifies pattern to match against node pathnames.

-option pattern

Specifies pattern to match against the entry's configuration option.

-exact

Match patterns exactly. The is the default.

-glob

-glob Use global pattern matching. Matching is done in a fashion similar to that used by the C-shell. For the two strings to match, their contents must be identical except that the following special sequences may appear in pattern:

*: Matches any sequence of characters in string, including a null string.
?: Matches any single character in string.
[chars]: Matches any character in the set given by chars. If a sequence of the form x-y appears in chars, then any character between x and y, inclusive, will match.
\x: Matches the single character x. This provides a way of avoiding the special interpretation of the characters *?[]\ in the pattern.

-regexp

Use regular expression pattern matching (i.e. the same as implemented by the regexp command).

-nonmatching

Expose nodes that don't match.

--

Indicates the end of flags.

pathName sort ?operation? args...

pathName sort auto ?boolean

Turns on/off automatic sorting of node entries. If boolean is true, entries will be automatically sorted as they are opened, closed, inserted, or deleted. If no boolean argument is provided, the current state is returned.

pathName sort cget option

Returns the current value of the configuration option given by option. Option may have any of the values accepted by the configure operation described below.

pathName sort configure ?option? ?value option value ...?

Query or modify the sorting configuration options of the widget. If no option is specified, returns a list describing all of the available options for pathName (see Tk_ConfigureInfo for information on the format of this list). If option is specified with no value, then the command 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 command modifies the given sorting option(s) to have the given value(s); in this case the command returns an empty string. Option and value are described below:

-column string

Specifies the column to sort. Entries in the widget are rearranged according to this column. If column is "" then no sort is performed.

-command string

Specifies a Tcl procedure to be called when sorting nodes. The procedure is called with three arguments: the pathname of the widget and the fields of two entries. The procedure returns 1 if the first node is greater than the second, -1 is the second is greater, and 0 if equal.

-decreasing boolean

Indicates to sort in ascending/descending order. If boolean is true, then the entries as in descending order. The default is no.

-mode string

Specifies how to compare entries when sorting. String may be one of the following:

ascii: Use string comparison based upon the ASCII collation order.
dictionary: Use dictionary-style comparison. This is the same as ascii except (a) case is ignored except as a tie-breaker and (b) if two strings contain embedded numbers, the numbers compare as integers, not characters. For example, "bigBoy" sorts between "bigbang" and "bigboy", and "x10y" sorts between "x9y" and "x11y".
integer: Compares fields as integers.
real: Compares fields as floating point numbers.
command: Use the Tcl proc specified by the -command option to compare entries when sorting. If no command is specified, the sort reverts to ascii sorting.

pathName sort once ?flags? tagOrId...

Sorts the children for each entries specified by tagOrId. By default, entries are sorted by name, but you can specify a Tcl proc to do your own comparisons.

-recurse: Recursively sort the entire branch, not just the children.

pathName tag operation args

Tags are a general means of selecting and marking nodes in the tree. A tag is just a string of characters, and it may take any form except that of an integer. The same tag may be associated with many different nodes.

Both operation and its arguments determine the exact behavior of the command. The operations available for tags are listed below.

pathName tag add string id...: Adds the tag string to one of more entries.
pathName tag delete string id...: Deletes the tag string from one or more entries.
pathName tag forget string: Removes the tag string from all entries. It's not an error if no entries are tagged as string.
pathName tag names ?id?: Returns a list of tags used. If an id argument is present, only those tags used by the node designated by id are returned.
pathName tag nodes string: Returns a list of ids that have the tag string. If no node is tagged as string, then an empty string is returned.

pathName text operation ?args?

This operation is used to provide text editing for cells (data fields in a column) or entry labels. It has several forms, depending on operation:

pathName text apply: Applies the edited buffer, replacing the entry label or data field. The edit window is hidden.
pathName text cancel: Cancels the editing operation, reverting the entry label or data value back to the previous value. The edit window is hidden.
pathName text cget value: Returns the current value of the configuration option given by option. Option may have any of the values accepted by the configure operation described below.
pathName text configure ?option value?: Query or modify the configuration options of the edit window. If no option is specified, returns a list describing all of the available options (see Tk_ConfigureInfo for information on the format of this list). If option is specified with no value, then the command 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 command modifies the given widget option(s) to have the given value(s); in this case the command returns an empty string. Option and value are described in the section "TEXT EDITING OPTIONS" below.

pathName text delete first last

Deletes the characters in the edit buffer between the two given character positions.

pathName text get ?-root? x y

pathName text icursor index

pathName text index index

Returns the text index of given index.

pathName text insert index string

Insert the text string string into the edit buffer at the index index. For example, the index 0 will prepend the buffer.

pathName text selection args

This operation controls the selection of the editing window. Note that this differs from the selection of entries. It has the following forms:

pathName text selection adjust index: Adjusts either the first or last index of the selection.
pathName text selection clear: Clears the selection.
pathName text selection from index: Sets the anchor of the selection.
pathName text selection present: Indicates if a selection is present.
pathName text selection range start end: Sets both the anchor and mark of the selection.
pathName text selection to index: Sets the unanchored end (mark) of the selection.

pathName toggle tagOrId

Opens or closes the node given by tagOrId. If the corresponding -opencommand or -closecommand option is set, then that command is also invoked.

pathName xview args

This command 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:

pathName 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 treeview widget's text is off-screen to the left, the middle 40% is visible in the window, and 40% of the text is off-screen to the right. These are the same values passed to scrollbars via the -xscrollcommand option.
pathName xview tagOrId: Adjusts the view in the window so that the character position given by tagOrId is displayed at the left edge of the window. Character positions are defined by the width of the character 0.
pathName xview moveto fraction: Adjusts the view in the window so that fraction of the total width of the treeview widget's text is off-screen to the left. fraction must be a fraction between 0 and 1.
pathName xview scroll number what: This command 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.

pathName yview ?args?

This command is used to query and change the vertical position of the text in the widget's window. It can take any of the following forms:

pathName 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 node at the top of the window, relative to the widget as a whole (0.5 means it is halfway through the treeview window, for example). The second element gives the position of the node just after the last one in the window, relative to the widget as a whole. These are the same values passed to scrollbars via the -yscrollcommand option.
pathName yview tagOrId: Adjusts the view in the window so that the node given by tagOrId is displayed at the top of the window.
pathName yview moveto fraction: Adjusts the view in the window so that the node given by fraction appears at the top of the window. Fraction is a fraction between 0 and 1; 0 indicates the first node, 0.33 indicates the node one-third the way through the treeview widget, and so on.
pathName yview scroll number what: This command adjusts 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 nodes become visible; if it is positive then later nodes become visible.

TREEVIEW OPTIONS

In addition to the configure operation, widget configuration options may also be set by the Tk option command. The class resource name is TreeView.



option add *TreeView.Foreground white
option add *TreeView.Background blue

The following widget options are available:

-activebackground color

Sets the background color for active entries. A node is active when the mouse passes over it's entry or using the activate operation.

-activeforeground color

Sets the foreground color of the active node. A node is active when the mouse passes over it's entry or using the activate operation.

-activeicons images

Specifies images to be displayed for an entry's icon when it is active. Images is a list of two Tk images: the first image is displayed when the node is open, the second when it is closed.

-autocreate boolean

If boolean is true, automatically create missing ancestor nodes when inserting new nodes. Otherwise flag an error. The default is no.

-allowduplicates boolean

If boolean is true, allow nodes with duplicate pathnames when inserting new nodes. Otherwise flag an error. The default is no.

-background color

Sets the background color of the widget. The default is white.

-borderwidth pixels

Sets the width of the 3-D border around the outside edge of the widget. The -relief option determines if the border is to be drawn. The default is 2.

-closecommand string

Specifies a Tcl script to be invoked when a node is closed. You can overrider this for individual entries using the entry's -closecommand option. The default is "". Percent substitutions are performed on string before it is executed. The following substitutions are valid:

%W: The pathname of the widget.
%p: The name of the node.
%P: The full pathname of the node.
%#: The id of the node.
%%: Translates to a single percent.

-cursor cursor

Specifies the widget's cursor. The default cursor is "".

-dashes number

Sets the dash style of the horizontal and vertical lines drawn connecting entries. Number is the length in pixels of the dashes and gaps in the line. If number is 0, solid lines will be drawn. The default is 1 (dotted).

-exportselection boolean

Indicates if the selection is exported. If the widget is exporting its selection then it will observe the standard X11 protocols for handling the selection. Selections are available as type STRING; the value of the selection will be the label of the selected nodes, separated by newlines. The default is no.

-flat boolean

Indicates whether to display the tree as a flattened list. If boolean is true, then the hierarchy will be a list of full paths for the nodes. This option also has affect on sorting. See the "SORT OPERATIONS" section for more information. The default is no.

-focusdashes dashList

Sets the dash style of the outline rectangle drawn around the entry label of the node that current has focus. Number is the length in pixels of the dashes and gaps in the line. If number is 0, a solid line will be drawn. The default is 1.

-focusforeground color

Sets the color of the focus rectangle. The default is black.

-font fontName

Specifies the font for entry labels. You can override this for individual entries with the entry's -font configuration option. The default is *-Helvetica-Bold-R-Normal-*-12-120-*.

-foreground color

Sets the text color of entry labels. You can override this for individual entries with the entry's -foreground configuration option. The default is black.

-height pixels

Specifies the requested height of widget. The default is 400.

-hideroot boolean

If boolean is true, it indicates that no entry for the root node should be displayed. The default is no.

-highlightbackground color

Specifies the normal color of the traversal highlight region when the widget does not have the input focus.

-highlightcolor color

Specifies the color of the traversal highlight rectangle when the widget has the input focus. The default is black.

-highlightthickness pixels

Specifies the width of the highlight rectangle indicating when the widget has input focus. The value may have any of the forms acceptable to Tk_GetPixels. If the value is zero, no focus highlight will be displayed. The default is 2.

-icons images

Specifies images for the entry's icon. Images is a list of two Tk images: the first image is displayed when the node is open, the second when it is closed.

-linecolor color

Sets the color of the connecting lines drawn between entries. The default is black.

-linespacing pixels

Sets the number of pixels spacing between entries. The default is 0.

-linewidth pixels

Set the width of the lines drawn connecting entries. If pixels is 0, no vertical or horizontal lines are drawn. The default is 1.

-opencommand string

Specifies a Tcl script to be invoked when a node is open. You can override this for individual entries with the entry's -opencommand configuration option. The default is "". Percent substitutions are performed on string before it is executed. The following substitutions are valid:

%W: The pathname of the widget.
%p: The name of the node.
%P: The full pathname of the node.
%#: The id of the node.
%%: Translates to a single percent.

-relief relief

Specifies the 3-D effect for the widget. Relief specifies how the treeview widget should appear relative to widget it is packed into; for example, raised means the treeview widget should appear to protrude. The default is sunken.

-scrollmode mode

Specifies the style of scrolling to be used. The following styles are valid. This is the default is hierbox.

listbox: Like the listbox widget, the last entry can always be scrolled to the top of the widget window. This allows the scrollbar thumb to shrink as the last entry is scrolled upward.
hierbox: Like the hierbox widget, the last entry can only be viewed at the bottom of the widget window. The scrollbar stays a constant size.
canvas: Like the canvas widget, the entries are bound within the scrolling area.

-selectbackground color

Sets the background color selected node entries. The default is #ffffea.

-selectborderwidth pixels

Sets the width of the raised 3-D border drawn around the labels of selected entries. The default is 0. -selectcommand string Specifies a Tcl script to invoked when the set of selected nodes changes. The default is "".

-selectforeground color

Sets the color of the labels of selected node entries. The default is black.

-selectmode mode

Specifies the selection mode. If mode is single, only one node can be selected at a time. If multiple more than one node can be selected. The default is single.

-separator string

Specifies the character sequence to use when splitting the path components. The separator may be several characters wide (such as "::") Consecutive separators in a pathname are treated as one. If string is the empty string, the pathnames are Tcl lists. Each element is a path component. The default is "".

-showtitles boolean

If boolean is false, column titles are not be displayed. The default is yes.

-sortselection boolean

If boolean is true, nodes in the selection are ordered as they are currently displayed (depth-first or sorted), not in the order they were selected. The default is no.

-takefocus focus

Provides information used when moving the focus from window to window via keyboard traversal (e.g., Tab and Shift-Tab). If focus is 0, this means that this window should be skipped entirely during keyboard traversal. 1 means that the this window should always receive the input focus. An empty value means that the traversal scripts make the decision whether to focus on the window. The default is "1".

-trim string

Specifies a string leading characters to trim from entry pathnames before parsing. This only makes sense if the -separator is also set. The default is "".

-width pixels

Sets the requested width of the widget. If pixels is 0, then the with is computed from the contents of the treeview widget. The default is 200.

-xscrollcommand string

Specifies the prefix for a command used to communicate with horizontal scrollbars. Whenever the horizontal view in the widget's window changes, the widget will generate a Tcl command by concatenating the scroll command and two numbers. If this option is not specified, then no command will be executed.

-xscrollincrement pixels

Sets the horizontal scrolling distance. The default is 20 pixels.

-yscrollcommand string

Specifies the prefix for a command used to communicate with vertical scrollbars. Whenever the vertical view in the widget's window changes, the widget will generate a Tcl command by concatenating the scroll command and two numbers. If this option is not specified, then no command will be executed.

-yscrollincrement pixels

Sets the vertical scrolling distance. The default is 20 pixels.

ENTRY OPTIONS

Many widget configuration options have counterparts in entries. For example, there is a -closecommand configuration option for both widget itself and for individual entries. Options set at the widget level are global for all entries. If the entry configuration option is set, then it overrides the widget option. This is done to avoid wasting memory by replicated options. Most entries will have redundant options.

There is no resource class or name for entries.

-activeicons images

Specifies images to be displayed as the entry's icon when it is active. This overrides the global -activeicons configuration option for the specific entry. Images is a list of two Tk images: the first image is displayed when the node is open, the second when it is closed.

-bindtags tagList

Specifies the binding tags for nodes. TagList is a list of binding tag names. The tags and their order will determine how events are handled for nodes. Each tag in the list matching the current event sequence will have its Tcl command executed. The default value is all.

-button string

Indicates whether a button should be displayed on the left side of the node entry. String can be yes, no, or auto. If auto, then a button is automatically displayed if the node has children. This is the default.

-closecommand string

Specifies a Tcl script to be invoked when the node is closed. This overrides the global -closecommand option for this entry. The default is "". Percent substitutions are performed on string before it is executed. The following substitutions are valid:

%W: The pathname of the widget.
%p: The name of the node.
%P: The full pathname of the node.
%#: The id of the node.
%%: Translates to a single percent.

-data string

Sets data fields for the node. String is a list of name-value pairs to be set. The default is "".

-font fontName

Sets the font for entry labels. This overrides the widget's -font option for this node. The default is *-Helvetica-Bold-R-Normal-*-12-120-*.

-foreground color

Sets the text color of the entry label. This overrides the widget's -foreground configuration option. The default is "".

-icons images

Specifies images to be displayed for the entry's icon. This overrides the global -icons configuration option. Images is a list of two Tk images: the first image is displayed when the node is open, the second when it is closed.

-label string

Sets the text for the entry's label. If not set, this defaults to the name of the node. The default is "".

-opencommand string

Specifies a Tcl script to be invoked when the entry is opened. This overrides the widget's -opencommand option for this node. The default is "". Percent substitutions are performed on string before it is executed. The following substitutions are valid:

%W: The pathname of the widget.
%p: The name of the node.
%P: The full pathname of the node.
%#: The id of the node.
%%: Translates to a single percent.

BUTTON OPTIONS

Button configuration options may also be set by the option command. The resource subclass is Button. The resource name is always button.



option add *TreeView.Button.Foreground white
option add *TreeView.button.Background blue

The following are the configuration options available for buttons.

-activebackground color: Sets the background color of active buttons. A button is made active when the mouse passes over it or by the button activate operation.
-activeforeground color: Sets the foreground color of active buttons. A button is made active when the mouse passes over it or by the button activate operation.
-background color: Sets the background of the button. The default is white.
-borderwidth pixels: Sets the width of the 3-D border around the button. The -relief option determines if a border is to be drawn. The default is 1.
-closerelief relief: Specifies the 3-D effect for the closed button. Relief indicates how the button should appear relative to the widget; for example, raised means the button should appear to protrude. The default is solid.
-cursor cursor: Sets the widget's cursor. The default cursor is "".
-foreground color: Sets the foreground color of buttons. The default is black.
-images images: Specifies images to be displayed for the button. Images is a list of two Tk images: the first image is displayed when the button is open, the second when it is closed. If the images is the empty string, then a plus/minus gadget is drawn. The default is "".
-openrelief relief: Specifies the 3-D effect of the open button. Relief indicates how the button should appear relative to the widget; for example, raised means the button should appear to protrude. The default is flat.
-size pixels: Sets the requested size of the button. The default is 0.

COLUMN OPTIONS

Column configuration options may also be set by the option command. The resource subclass is Column. The resource name is the name of the column.



option add *TreeView.Column.Foreground white
option add *TreeView.treeView.Background blue

The following configuration options are available for columns.

-background color: Sets the background color of the column. This overrides the widget's -background option. The default is white.
-borderwidth pixels: Sets the width of the 3-D border of the column. The -relief option determines if a border is to be drawn. The default is 0.
-edit boolean: Indicates if the column's data fields can be edited. If boolean is false, the data fields in the column may not be edited. The default is yes.
-foreground color: Specifies the foreground color of the column. You can override this for individual entries with the entry's -foreground option. The default is black.
-font fontName: Sets the font for a column. You can override this for individual entries with the entry's -font option. The default is *-Helvetica-Bold-R-Normal-*-12-120-*.
-hide boolean: If boolean is true, the column is not displayed. The default is yes.
-justify justify: Specifies how the column data fields title should be justified within the column. This matters only when the column is wider than the data field to be display. Justify must be left, right, or center. The default is left.
-pad pad: Specifies how much padding for the left and right sides of the column. Pad is a list of one or two screen distances. If pad has two elements, the left side of the column is padded by the first distance and the right side by the second. If pad has just one distance, both the left and right sides are padded evenly. The default is 2.
-relief relief: Specifies the 3-D effect of the column. Relief specifies how the column should appear relative to the widget; for example, raised means the column should appear to protrude. The default is flat.
-state state: Sets the state of the column. If state is disable then the column title can not be activated nor invoked. The default is normal.
-text string: Sets the title for the column. The default is "".
-titleforeground color: Sets the foreground color of the column title. The default is black.
-titleshadow color: Sets the color of the drop shadow of the column title. The default is "".
-width pixels: Sets the requested width of the column. This overrides the computed with of the column. If pixels is 0, the width is computed as from the contents of the column. The default is 0.

TEXT EDITING OPTIONS

Text edit window configuration options may also be set by the option command. The resource class is TreeViewEditor. The resource name is always edit.



option add *TreeViewEditor.Foreground white
option add *edit.Background blue

The following are the configuration options available for the text editing window.

-background color: Sets the background of the text edit window. The default is white.
-borderwidth pixels: Sets the width of the 3-D border around the edit window. The -relief option determines if a border is to be drawn. The default is 1.
-exportselection boolean: Indicates if the text selection is exported. If the edit window is exporting its selection then it will observe the standard X11 protocols for handling the selection. Selections are available as type STRING. The default is no.
-relief relief: Specifies the 3-D effect of the edit window. Relief indicates how the background should appear relative to the edit window; for example, raised means the background should appear to protrude. The default is solid.
-selectbackground color: Sets the background of the selected text in the edit window. The default is white.
-selectborderwidth pixels: Sets the width of the 3-D border around the selected text in the edit window. The -selectrelief option determines if a border is to be drawn. The default is 1.
-selectforeground color: Sets the foreground of the selected text in the edit window. The default is white.
-selectrelief relief: Specifies the 3-D effect of the selected text in the edit window. Relief indicates how the text should appear relative to the edit window; for example, raised means the text should appear to protrude. The default is flat.

DEFAULT BINDINGS

Tk automatically creates class bindings for treeviews that give them Motif-like behavior. Much of the behavior of a treeview widget is determined by its -selectmode option, which selects one of two ways of dealing with the selection.

If the selection mode is single, only one node can be selected at a time. Clicking button 1 on an node selects it and deselects any other selected item.

If the selection mode is multiple, any number of entries may be selected at once, including discontiguous ranges. Clicking Control-Button-1 on a node entry toggles its selection state without affecting any other entries. Pressing Shift-Button-1 on a node entry selects it, extends the selection.

[1]: In extended mode, the selected range can be adjusted by pressing button 1 with the Shift key down: this modifies the selection to consist of the entries between the anchor and the entry under the mouse, inclusive. The un-anchored end of this new selection can also be dragged with the button down.
[2]: In extended mode, pressing button 1 with the Control key down starts a toggle operation: the anchor is set to the entry under the mouse, and its selection state is reversed. The selection state of other entries isn't changed. If the mouse is dragged with button 1 down, then the selection state of all entries between the anchor and the entry under the mouse is set to match that of the anchor entry; the selection state of all other entries remains what it was before the toggle operation began.
[3]: If the mouse leaves the treeview window with button 1 down, the window scrolls away from the mouse, making information visible that used to be off-screen on the side of the mouse. The scrolling continues until the mouse re-enters the window, the button is released, or the end of the hierarchy is reached.
[4]: Mouse button 2 may be used for scanning. If it is pressed and dragged over the treeview widget, the contents of the hierarchy drag at high speed in the direction the mouse moves.
[5]: If the Up or Down key is pressed, the location cursor (active entry) moves up or down one entry. If the selection mode is browse or extended then the new active entry is also selected and all other entries are deselected. In extended mode the new active entry becomes the selection anchor.
[6]: In extended mode, Shift-Up and Shift-Down move the location cursor (active entry) up or down one entry and also extend the selection to that entry in a fashion similar to dragging with mouse button 1.
[7]: The Left and Right keys scroll the treeview widget view left and right by the width of the character 0. Control-Left and Control-Right scroll the treeview widget view left and right by the width of the window. Control-Prior and Control-Next also scroll left and right by the width of the window.
[8]: The Prior and Next keys scroll the treeview widget view up and down by one page (the height of the window).
[9]: The Home and End keys scroll the treeview widget horizontally to the left and right edges, respectively.
[10]: Control-Home sets the location cursor to the the first entry, selects that entry, and deselects everything else in the widget.
[11]: Control-End sets the location cursor to the the last entry, selects that entry, and deselects everything else in the widget.
[12]: In extended mode, Control-Shift-Home extends the selection to the first entry and Control-Shift-End extends the selection to the last entry.
[13]: In multiple mode, Control-Shift-Home moves the location cursor to the first entry and Control-Shift-End moves the location cursor to the last entry.
[14]: The space and Select keys make a selection at the location cursor (active entry) just as if mouse button 1 had been pressed over this entry.
[15]: In extended mode, Control-Shift-space and Shift-Select extend the selection to the active entry just as if button 1 had been pressed with the Shift key down.
[16]: In extended mode, the Escape key cancels the most recent selection and restores all the entries in the selected range to their previous selection state.
[17]: Control-slash selects everything in the widget, except in single and browse modes, in which case it selects the active entry and deselects everything else.
[18]: Control-backslash deselects everything in the widget, except in browse mode where it has no effect.
[19]: The F16 key (labelled Copy on many Sun workstations) or Meta-w copies the selection in the widget to the clipboard, if there is a selection.

The behavior of treeview widgets can be changed by defining new bindings for individual widgets or by redefining the class bindings.

WIDGET BINDINGS

In addition to the above behavior, the following additional behavior is defined by the default widget class (TreeView) bindings.

<ButtonPress-2>: Starts scanning.
<B2-Motion>: Adjusts the scan.
<ButtonRelease-2>: Stops scanning.
<B1-Leave>: Starts auto-scrolling.
<B1-Enter>: Starts auto-scrolling
<KeyPress-Up>: Moves the focus to the previous entry.
<KeyPress-Down>: Moves the focus to the next entry.
<Shift-KeyPress-Up>: Moves the focus to the previous sibling.
<Shift-KeyPress-Down>: Moves the focus to the next sibling.
<KeyPress-Prior>: Moves the focus to first entry. Closed or hidden entries are ignored.
<KeyPress-Next>: Move the focus to the last entry. Closed or hidden entries are ignored.
<KeyPress-Left>: Closes the entry. It is not an error if the entry has no children.
<KeyPress-Right>: Opens the entry, displaying its children. It is not an error if the entry has no children.
<KeyPress-space>: In "single" select mode this selects the entry. In "multiple" mode, it toggles the entry (if it was previous selected, it is not deselected).
<KeyRelease-space>: Turns off select mode.
<KeyPress-Return>: Sets the focus to the current entry.
<KeyRelease-Return>: Turns off select mode.
<KeyPress>: Moves to the next entry whose label starts with the letter typed.
<KeyPress-Home>: Moves the focus to first entry. Closed or hidden entries are ignored.
<KeyPress-End>: Move the focus to the last entry. Closed or hidden entries are ignored.
<KeyPress-F1>: Opens all entries.
<KeyPress-F2>: Closes all entries (except root).

BUTTON BINDINGS

Buttons have bindings. There are associated with the "all" bindtag (see the entry's -bindtag option). You can use the bind operation to change them.

<Enter>: Highlights the button of the current entry.
<Leave>: Returns the button back to its normal state.
<ButtonRelease-1>: Adjust the view so that the current entry is visible.

ENTRY BINDINGS

Entries have default bindings. There are associated with the "all" bindtag (see the entry's -bindtag option). You can use the bind operation to modify them.

<Enter>: Highlights the current entry.
<Leave>: Returns the entry back to its normal state.
<ButtonPress-1>: Sets the selection anchor the current entry.
<Double-ButtonPress-1>: Toggles the selection of the current entry.
<B1-Motion>: For "multiple" mode only. Saves the current location of the pointer for auto-scrolling. Resets the selection mark.
<ButtonRelease-1>: For "multiple" mode only. Sets the selection anchor to the current entry.
<Shift-ButtonPress-1>: For "multiple" mode only. Extends the selection.
<Shift-Double-ButtonPress-1>: Place holder. Does nothing.
<Shift-B1-Motion>: Place holder. Does nothing.
<Shift-ButtonRelease-1>: Stop auto-scrolling.
<Control-ButtonPress-1>: For "multiple" mode only. Toggles and extends the selection.
<Control-Double-ButtonPress-1>: Place holder. Does nothing.
<Control-B1-Motion>: Place holder. Does nothing.
<Control-ButtonRelease-1>: Stops auto-scrolling.
<Control-Shift-ButtonPress-1>: ???
<Control-Shift-Double-ButtonPress-1>: Place holder. Does nothing.
<Control-Shift-B1-Motion>: Place holder. Does nothing.

COLUMN BINDINGS

Columns have bindings too. They are associated with the column's "all" bindtag (see the column -bindtag option). You can use the column bind operation to change them.

<Enter>: Highlights the current column title.
<Leave>: Returns the column back to its normal state.
<ButtonRelease-1>: Invokes the command (see the column's -command option) if one if specified.

COLUMN RULE BINDINGS

<Enter>: Highlights the current and activates the ruler.
<Leave>: Returns the column back to its normal state. Deactivates the ruler.
<ButtonPress-1>: Sets the resize anchor for the column.
<B1-Motion>: Sets the resize mark for the column.
<ButtonRelease-1>: Adjust the size of the column, based upon the resize anchor and mark positions.

EXAMPLE

The treeview command creates a new widget.



treeview .h -bg white

A new Tcl command .h is also created. This command can be used to query and modify the treeview widget. For example, to change the background color of the table to "green", you use the new command and the widget's configure operation.



# Change the background color.
.h configure -background "green"

By default, the treeview widget will automatically create a new tree object to contain the data. The name of the new tree is the pathname of the widget. Above, the new tree object name is ".h". But you can use the -tree option to specify the name of another tree.



# View the tree "myTree".
.h configure -tree "myTree"

When a new tree is created, it contains only a root node. The node is automatically opened. The id of the root node is always 0 (you can use also use the special id root). The insert operation lets you insert one or more new entries into the tree. The last argument is the node's pathname.



# Create a new entry named "myEntry"
set id [.h insert end "myEntry"]

This appends a new node named "myEntry". It will positioned as the last child of the root of the tree (using the position "end"). You can supply another position to order the node within its siblings.



# Prepend "fred".
set id [.h insert 0 "fred"]

Entry names do not need to be unique. By default, the node's label is its name. To supply a different text label, add the -label option.



# Create a new node named "fred"
set id [.h insert end "fred" -label "Fred Flintstone"]

The insert operation returns the id of the new node. You can also use the index operation to get this information.



# Get the id of "fred"
.h index "fred"

To insert a node somewhere other than root, use the -at switch. It takes the id of the node where the new child will be added.



# Create a new node "barney" in "fred".
.h insert -at $id end "barney"

A pathname describes the path to an entry in the hierarchy. It's a list of entry names that compose the path in the tree. Therefore, you can also add "barney" to "fred" as follows.



# Create a new sub-entry of "fred"
.h insert end "fred barney"

Every name in the list is ancestor of the next. All ancestors must already exist. That means that an entry "fred" is an ancestor of "barney" and must already exist. But you can use the -autocreate configuration option to force the creation of ancestor nodes.



# Force the creation of ancestors.
.h configure -autocreate yes 
.h insert end "fred barney wilma betty"

Sometimes the pathname is already separated by a character sequence rather than formed as a list. A file name is a good example of this. You can use the -separator option to specify a separator string to split the path into its components. Each pathname inserted is automatically split using the separator string as a separator. Multiple separators are treated as one.



.h configure -separator /
.h insert end "/usr/local/tcl/bin"

If the path is prefixed by extraneous characters, you can automatically trim it off using the -trim option. It removed the string from the path before it is parsed.



.h configure -trim C:/windows -separator /
.h insert end "C:/window/system"

You can insert more than one entry at a time with the insert operation. This can be much faster than looping over a list of names.



# The slow way
foreach f [glob $dir/*] {
    .h insert end $f
}
# The fast way
eval .h insert end [glob $dir/*]

In this case, the insert operation will return a list of ids of the new entries.

You can delete entries with the delete operation. It takes one or more tags of ids as its argument. It deletes the entry and all its children.



.h delete $id

Entries have several configuration options. They control the appearance of the entry's icon and label. We have already seen the -label option that sets the entry's text label. The entry configure operation lets you set or modify an entry's configuration options.



.h entry configure $id -color red -font fixed

You can hide an entry and its children using the -hide option.



.h entry configure $id -hide yes

More that one entry can be configured at once. All entries specified are configured with the same options.



.h entry configure $i1 $i2 $i3 $i4 -color brown

An icon is displayed for each entry. It's a Tk image drawn to the left of the label. You can set the icon with the entry's -icons option. It takes a list of two image names: one to represent the open entry, another when it is closed.



set im1 [image create photo -file openfolder.gif]
set im2 [image create photo -file closefolder.gif]
.h entry configure $id -icons "$im1 $im2"

If -icons is set to the empty string, no icons are display.

If an entry has children, a button is displayed to the left of the icon. Clicking the mouse on this button opens or closes the sub-hierarchy. The button is normally a + or - symbol, but can be configured in a variety of ways using the button configure operation. For example, the + and - symbols can be replaced with Tk images.



set im1 [image create photo -file closefolder.gif]
set im2 [image create photo -file downarrow.gif]
.h button configure $id -images "$im1 $im2" \
    -openrelief raised -closerelief raised

Entries can contain an arbitrary number of data fields. Data fields are name-value pairs. Both the value and name are strings. The entry's -data option lets you set data fields.



.h entry configure $id -data {mode 0666 group users}

The -data takes a list of name-value pairs.

You can display these data fields as columns in the treeview widget. You can create and configure columns with the column operation. For example, to add a new column to the widget, use the column insert operation. The last argument is the name of the data field that you want to display.



.h column insert end "mode"

The column title is displayed at the top of the column. By default, it's is the field name. You can override this using the column's -text option.



.h column insert end "mode" -text "File Permissions"

Columns have several configuration options. The column configure operation lets you query or modify column options.



.h column configure "mode" -justify left

The -justify option says how the data is justified within in the column. The -hide option indicates whether the column is displayed.



.h column configure "mode" -hide yes

Entries can be selected by clicking on the mouse. Selected entries are drawn using the colors specified by the -selectforeground and -selectbackground configuration options. The selection itself is managed by the selection operation.



# Clear all selections
.h selection clear 0 end
# Select the root node
.h selection set 0

The curselection operation returns a list of ids of all the selected entries.



set ids [.h curselection]

You can use the get operation to convert the ids to their pathnames.



set names [eval .h get -full $ids]

If a treeview is exporting its selection (using the -exportselection option), then it will observe the standard X11 protocols for handling the selection. Treeview selections are available as type STRING; the value of the selection will be the pathnames of the selected entries, separated by newlines.

The treeview supports two modes of selection: single and multiple. In single select mode, only one entry can be selected at a time, while multiple select mode allows several entries to be selected. The mode is set by the widget's -selectmode option.



.h configure -selectmode "multiple"

You can be notified when the list of selected entries changes. The widget's -selectcommand specifies a Tcl procedure that is called whenever the selection changes.



proc SelectNotify { widget } {
   set ids [$widget curselection]
}
.h configure -selectcommand "SelectNotify .h"

The widget supports the standard Tk scrolling and scanning operations. The treeview can be both horizontally and vertically. You can attach scrollbars to the treeview the same way as the listbox or canvas widgets.



scrollbar .xbar -orient horizontal -command ".h xview"
scrollbar .ybar -orient vertical -command ".h yview"
.h configure -xscrollcommand ".xbar set" \
    -yscrollcommand ".ybar set"

There are three different modes of scrolling: listbox, canvas, and hierbox. In listbox mode, the last entry can always be scrolled to the top of the widget. In hierbox mode, the last entry is always drawn at the bottom of the widget. The scroll mode is set by the widget's -selectmode option.



.h configure -scrollmode "listbox"

Entries can be programmatically opened or closed using the open and close operations respectively.



.h open $id
.h close $id

When an entry is opened, a Tcl procedure can be automatically invoked. The -opencommand option specifies this procedure. This procedure can lazily insert entries as needed.



proc AddEntries { dir } {
   eval .h insert end [glob -nocomplain $dir/*] 
}
.h configure -opencommand "AddEntries %P"

Now when an entry is opened, the procedure AddEntries is called and adds children to the entry. Before the command is invoked, special "%" substitutions (like bind) are performed. Above, %P is translated to the pathname of the entry.

The same feature exists when an entry is closed. The -closecommand option specifies the procedure.



proc DeleteEntries { id } {
   .h entry delete $id 0 end
}
.h configure -closecommand "DeleteEntries %#"

When an entry is closed, the procedure DeleteEntries is called and deletes the entry's children using the entry delete operation (%# is the id of entry).