NAME
iwidgets::collapsablewidget - Create and manipulate a labeled widget

SYNOPSIS
collapsablewidget pathName ?options?

INHERITANCE
itk::Widget <- iwidgets::collapsablewidget

STANDARD OPTIONS

background	cursor	foreground

See the "options" manual entry for details on the standard options.

WIDGET-SPECIFIC OPTIONS

Name:	collapsed
Class:	Collapsed
Command-Line Switch:	-collapsed

    Specifies whether to hide or display the childsite. Takes a boolean value. If true, the childsite is hidden from view, if false it is displayed. The default is to display the childsite.

Name:	foreground
Class:	Foreground
Command-Line Switch:	-foreground

    Specifies the foreground to be used in the label.

Name:	labelBitmap
Class:	Bitmap
Command-Line Switch:	-labelbitmap

    Specifies a bitmap to display in the widget, in any of the forms acceptable to Tk_GetBitmap. This option overrides the labeltext option.

Name:	labelFont
Class:	Font
Command-Line Switch:	-labelfont

    Specifies the font to be used for the label.

Name:	labelImage
Class:	Image
Command-Line Switch:	-labelimage

    Specifies a image to be used as the label. The image may be any of the values created by the image create command. This option overrides both the labelbitmap and labeletext options.

Name:	labelMargin
Class:	Margin
Command-Line Switch:	-labelmargin

    Specifies the distance between the childsite and label in any of the forms acceptable to Tk_GetPixels. The default is 2 pixel.

Name:	labelText
Class:	Text
Command-Line Switch:	-labeltext

    Specifies the text of the label around the childsite.

Name:	labelVariable
Class:	Variable
Command-Line Switch:	-labelvariable

    Specifies the text variable of the label around the childsite.

DESCRIPTION

The collapsablewidget command creates a labeled widget which contains a button, a label and child site. The child site is a frame which can filled with any widget via a derived class or though the use of the childsite method. This class was designed to be a general purpose base class for supporting the combination of label widget and a childsite, in which the button (which displays a suitable image) controls whether to display the childsite or not. The options include the ability to modify the font and margin, and control the display of the labels.

METHODS

The collapsablewidget command creates a new Tcl command whose name is pathName. This command may be used to invoke various operations on the widget. It has the following general form: pathName option ?arg arg ...? Option and the args determine the exact behavior of the command. The following commands are possible for collapsablewidget widgets:

WIDGET-SPECIFIC METHODS

pathName childsite
    Return the path name of the child site.

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

pathName collapse
    Hides the childsite from view, updating the image in the button to reflect the new state.

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 collapsablewidget command.

pathName reveal
    Bring the childsite into view, updating the image in the button to reflect the new state.

pathName toggle
    If the childsite is in view, hide it, and if it is hidden display it. Updates the image in the button to reflect the new state.

STATIC METHODS

Collapsablewidget::alignlabels widget ?widget ...?
    The alignlabels procedure takes a list of widgets derived from the Collapsablewidget class and uses the label margin to make each widget have the same total space for the combination of label and margin. The net effect is to left align the labels.

COMPONENTS

Name:	label
Class:	label

    The label component provides the label for the labeled widget. See the "label" widget manual entry for details on the label component item.

Name:	lwchildsite
Class:	frame

    The lwchildsite component is the user child site for the labeled widget. See the "frame" widget manual entry for details on the lwchildsite component item.

EXAMPLE

    The collapsablewidget is useful when you wish to display a large amount of information in a single window, only some of which the user is likely to want to see at any one time. By placing a number of collapsable widgets in the window, each of which contains some of the available information (presumably categorised appropriately), you can make very effective use of a small amount of screen real-estate. The following is an example of how to create a widget which has its childsite hidden, and then reveal the childsite later.

 iwidgets::collapsablewidget .cw -labeltext "Canvas Widget" -collapsed 1
 pack .cw -fill both -expand yes -padx 10 -pady 10
 set cw [canvas [.cw childsite].c -relief raised -width 200 -height 200]
 pack $cw -padx 10 -pady 10
 after 2000 {.cw reveal}

AUTHOR
Vince Darley

KEYWORDS
collapsablewidget, widget