1Tree(3) User Contributed Perl Documentation Tree(3)
2
6 Tk::Tree - Create and manipulate Tree widgets
7
9 use Tk::Tree;
10 $tree = $parent->Tree(?options?);
12
14 The Tree class is derived from the HList class and inherits all the
15 methods, options and subwidgets of its super-class. A Tree widget is
16 not scrolled by default.
17
19 Tree supports all the standard options of an HList widget. See
20 Tk::options for details on the standard options.
21
23 Name: browseCmd
24 Class: BrowseCmd
25 Switch: -browsecmd
26 Specifies a callback to call whenever the user browses on an entry
27 (usually by single-clicking on the entry). The callback is called
28 with one argument, the pathname of the entry.
29 Name: closeCmd
31 Class: CloseCmd
32 Switch: -closecmd
33 Specifies a callback to call whenever an entry needs to be closed
34 (See "BINDINGS" below). This method is called with one argument,
35 the pathname of the entry. This method should perform appropriate
36 actions to close the specified entry. If the -closecmd option is
37 not specified, the default closing action is to hide all child
38 entries of the specified entry.
39 Name: command
41 Class: Command
42 Switch: -command
43 Specifies a callback to call whenever the user activates an entry
44 (usually by double-clicking on the entry). The callback is called
45 with one argument, the pathname of the entry.
46 Name: ignoreInvoke
48 Class: IgnoreInvoke
49 Switch: -ignoreinvoke
50 A Boolean value that specifies when a branch should be opened or
51 closed. A branch will always be opened or closed when the user
52 presses the (+) and (-) indicators. However, when the user invokes
53 a branch (by doublc-clicking or pressing <Return>), the branch will
54 be opened or closed only if -ignoreinvoke is set to false (the
55 default setting).
56 Name: openCmd
58 Class: OpenCmd
59 Switch: -opencmd
60 Specifies a callback to call whenever an entry needs to be opened
61 (See "BINDINGS" below). This method is called with one argument,
62 the pathname of the entry. This method should perform appropriate
63 actions to open the specified entry. If the -opencmd option is not
64 specified, the default opening action is to show all the child
65 entries of the specified entry.
66
68 The Tree method creates a new window and makes it into a Tree widget
69 and return a reference to it. Additional options, described above, may
70 be specified on the command line or in the option database to configure
71 aspects of the Tree widget such as its cursor and relief.
72 The Tree widget can be used to display hierarchical data in a tree
74 form. The user can adjust the view of the tree by opening or closing
75 parts of the tree.
76 To display a static tree structure, you can add the entries into the
78 Tree widget and hide any entries as desired. Then you can call the
79 autosetmode method. This will set up the Tree widget so that it handles
80 all the open and close events automatically. the demonstration program
81 Tixish/examples/perl-tix-tree).
82 The above method is not applicable if you want to maintain a dynamic
84 tree structure, i.e, you do not know all the entries in the tree and
85 you need to add or delete entries subsequently. To do this, you should
86 first create the entries in the Tree widget. Then, use the setmode
87 method to indicate the entries that can be opened or closed, and use
88 the -opencmd and -closecmd options to handle the opening and closing
89 events. (Please see the demonstration program
90 Tixish/examples/perl-tix-dyntree).
91 Use either
93 $parent->Scrolled('Tree', ... );
95 or
97 $parent->ScrlTree( ... );
99 to create a scrolled Tree. See Tk::Scrolled for details.
101
103 The Tree method creates a widget object. This object supports the
104 configure and cget methods described in Tk::options which can be used
105 to enquire and modify the options described above. The widget also
106 inherits all the methods provided by the generic Tk::Widget class.
107 The following additional methods are available for Tree widgets:
109 $tree->add_pathimage(treeRegExp [, openImg, closeImg])
111 This method defines images for a given path (images must be in xpm
112 format). The path can be determined by a simplified regular
113 expression. There are just three metasymbols:
114 ^ at the beginning of the "treeRegExp" same as in Perl regular
116 expressions
117 * anything
119 $ at the end of the "TreeRegExp", the same as in Perl regular
121 expressions
122 Examples:
124 $tree->add_pathimage('^root','openfolder','folder');
126 matches "root", "root.foo", "root.bar", but not "foo.root"
128 $tree->add_pathimage('root.*.class','openfolder','folder');
130 matches all paths containing "root.<anything>.class", but not
132 "root.<anything>.<anything>.class" "*" is one part of the path. If
133 you want to use a wildcard for two steps, you have to use "*.*".
134 $tree->add_pathimage('class$','openfolder','folder');
136 This matches all path with "class" at the end.
138 $tree->autosetmode
140 This method calls the setmode method for all the entries in this
141 Tree widget: if an entry has no child entries, its mode is set to
142 none. Otherwise, if the entry has any hidden child entries, its
143 mode is set to open; otherwise its mode is set to close.
144 $tree->child_entries([$path][,$depth])
146 This method returns in list context an array that contains all
147 pathnames of subentries within the given path. In scalar context it
148 returns the number of subentries in the given path.
149 Example:
151 root
152 | foo
153 | bar
154 | | bar1
155 | | bar2
156 my @childentries = $tree->child_entries('root.bar');
158 # returns (root.bar.bar1, root.bar.bar2)
159 my $nr_of_subentries = $tree->child_entries('root',2);
161 # returns 4
162 If $path is omitted, all it is assumed, that the entry above 'root'
164 is meant. $depth defines the numbers of levels.
165 $tree->close(entryPath)
167 Close the entry given by entryPath if its mode is close.
168 $tree->getmode(entryPath)
170 Returns the current mode of the entry given by entryPath.
171 $tree->open(entryPath)
173 Open the entry given by entryPath if its mode is open.
174 $tree->setmode(entryPath, mode)
176 This method is used to indicate whether the entry given by
177 entryPath has children entries and whether the children are
178 visible. mode must be one of open, close or none. If mode is set to
179 open, a (+) indicator is drawn next to the entry. If mode is set to
180 close, a (-) indicator is drawn next to the entry. If mode is set
181 to none, no indicators will be drawn for this entry. The default
182 mode is none. The open mode indicates the entry has hidden children
183 and this entry can be opened by the user. The close mode indicates
184 that all the children of the entry are now visible and the entry
185 can be closed by the user.
186
188 The basic mouse and keyboard bindings of the Tree widget are the same
189 as the bindings of the HList widget. In addition, the entries can be
190 opened or closed under the following conditions:
191 [1] If the mode of the entry is open, it can be opened by clicking on
193 its (+) indicator.
194 [2] If the mode of the entry is close, it can be closed by clicking on
196 its (-) indicator.
197
199 Tk::HList
200
202 Perl/TK version by Chris Dean <ctdean@cogit.com>. Original Tcl/Tix
203 version by Ioi Kim Lam.
204 Additions by Renee Baecker <module@renee-baecker.de>
206
208 Thanks to Achim Bohnet <ach@mpe.mpg.de> for all his help.
209perl v5.36.0 2022-07-22 Tree(3)