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 descedants 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.
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
- 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
- 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 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.
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).
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.
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.
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.
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).
KEYWORDS¶
treeview, widget