Tree3tix

Usage

Super-class

The TixTree class is derived from the TixScrolledHList class and inherits all the commands, options and subwidgets of its super-class.

Options

TixTree supports all the standard options of a frame widget. See the options(n) manual entry for details on the standard options.

Options

Name:		browseCmd
Class:		BrowseCmd
Switch:		-browsecmd

Specifies a command to call whenever the user browses on an entry (usually by single-clicking on the entry). The command is called with one argument, the pathname of the entry.

Name:		closeCmd
Class:		CloseCmd
Switch:		-closecmd

Specifies a command to call whenever an entry needs to be closed (See the BINDINGS section below). This command is called with one argument, the pathname of the entry. This command should perform appropriate actions to close the specified entry. If the -closecmd option is not specified, the default closing action is to hide all child entries of the specified entry.

Name:		command
Class:		Command
Switch:		-command

Specifies a command to call whenever the user activates an entry (usually by double-clicking on the entry). The command is called with one argument, the pathname of the entry.

Name:		ignoreInvoke
Class:		IgnoreInvoke
Switch:		-ignoreinvoke

A Boolean value that specifies when a branch should be opened or closed. A branch will always be opened or closed when the user presses the (+) and (-) indicators. However, when the user invokes a branch (by doublc-clicking or pressing <Return>), the branch will be opened or closed only if -ignoreinvoke is set to false (the default setting).

Name:		openCmd
Class:		OpenCmd
Switch:		-opencmd

Specifies a command to call whenever an entry needs to be opened (See the BINDINGS section below). This command is called with one argument, the pathname of the entry. This command should perform appropriate actions to open the specified entry. If the -opencmd option is not specified, the default opening action is to show all the child entries of the specified entry.

Subwidgets

Name:		hlist
Class:		TixHList

The hierarchical listbox that displays the tree.

Name:		hsb
Class:		Scrollbar

The horizontal scrollbar subwidget.

Name:		vsb
Class:		Scrollbar

The vertical scrollbar subwidget.

Overview

The tixTree command creates a new window (given by the pathName argument) and makes it into a Tree widget. Additional options, described above, may be specified on the command line or in the option database to configure aspects of the Tree widget such as its cursor and relief.

The Tree widget can be used to display hierachical data in a tree form. The user can adjust the view of the tree by opening or closing parts of the tree.

To display a static tree structure, you can add the entries into the hlist subwidget and hide any entries as desired. Then you can call the autosetmode method. This will set up the Tree widget so that it handles all the open and close events automatically. (Please see the demonstration program demos/samples/Tree.tcl).

The above method is not applicable if you want to maintain a dynamic tree structure, i.e, you do not know all the entries in the tree and you need to add or delete entries subsequently. To do this, you should first create the entries in the hlist subwidget. Then, use the setmode method to indicate the entries that can be opened or closed, and use the -opencmd and -closecmd options to handle the opening and closing events. (Please see the demonstration program demos/samples/DynTree.tcl demo).

Widget commands

The tixTree command creates a new Tcl command whose name is the same as the path name of the Tree's window. This command may be used to invoke various operations on the widget. It has the following general form:

pathName option ?arg arg ...?

PathName is the name of the command, which is the same as the Tree widget's path name. Option and the args determine the exact behavior of the command. The following commands are possible for Tree widgets:

pathName autosetmode

This command calls the setmode method for all the entries in this Tree widget: if an entry has no child entries, its mode is set to none. Otherwise, if the entry has any hidden child entries, its mode is set to open; otherwise its mode is set to close.

pathName cget option

Returns the current value of the configuration option given by option. Option may have any of the values accepted by the tixTree command.

pathName close entryPath

Close the entry given by entryPath if its mode is close.

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 may have any of the values accepted by the tixTree command.

pathName getmode entryPath

Returns the current mode of the entry given by entryPath.

pathName open entryPath

Open the entry givaen by entryPath if its mode is open.

pathName setmode entryPath mode

This command is used to indicate whether the entry given by entryPath has children entries and whether the children are visible. mode must be one of open, close or none. If mode is set to open, a (+) indicator is drawn next the the entry. If mode is set to close, a (-) indicator is drawn next the the entry. If mode is set to none, no indicators will be drawn for this entry. The default mode is none. The open mode indicates the entry has hidden children and this entry can be opened by the user. The close mode indicates that all the children of the entry are now visible and the entry can be closed by the user.

pathName subwidget name ?args?

When no options are given, this command returns the pathname of the subwidget of the specified name.

When options are given, the widget command of the specified subwidget will be called with these options.

Bindings

The basic mouse and keyboard bindings of the Tree widget are the same as the bindings of the HList widget.

In addition, the entries can be opened or closed under the following conditions:

[1]

If the mode of the entry is open, it can be opened by clicking on its (+) indicator or double-clicking on the entry.

[2]

If the mode of the entry is close, it can be closed by clicking on its (-) indicator or double-clicking on the entry.

Keywords

Tix(n),tixHList(n)