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scrolledlistbox - Create and manipulate scrolled listbox widgets

Synopsis

scrolledlistbox pathName ?options?

Inheritance

itk::Widget <- Labeledwidget <- Scrolledwidget <- Scrolledlistbox

Standard Options

activeBackground
background borderWidthcursor
exportSelection foreground
highlightColor highlightThickness relief selectBackground selectBorderWidthselectForeground

See the «options» manual entry for details on the standard

options.

Associated Options

selectMode
listvariable

See the «listbox» widget manual entry for details on the above

associated options.
activeRelief elementBorderwidth jumptroughColor

See the «scrollbar» widget manual entry for details on the above

associated options.

Inherited Options

disabledForeground
labelBitmap labelFontlabelImage labelMargin labelPos labelText labelVariable state

See the «labeledwidget» class manual entry for details on the

inherited options.

Widget-specific Options

Name: dblClickCommand

Class: Command

Command-Line Switch: -dblclickcommand

Specifies a Tcl command procedure which is called when an item is

double clicked. Typically this occurs when mouse button 1 is double clicked over an item. Selection policy does not matter.

Name: height

Class: Height

Command-Line Switch: -height

Specifies the height of the scrolled list box as an entire unit.

The value may be specified in any of the forms acceptable to

Tk_GetPixels. Any additional space needed to display the other

components such as labels, margins, and scrollbars force the listbox to be compressed. A value of zero along with the same value for the width causes the value given for the visibleitems option to be applied which administers geometry constraints in a different manner. The default height is zero.

Name: hscrollMode

Class: ScrollMode

Command-Line Switch: -hscrollmode

Specifies the the display mode to be used for the horizontal

scrollbar: static, dynamic, or none. In static mode, the scroll bar is displayed at all times. Dynamic mode displays the scroll bar as required, and none disables the scroll bar display. The default is static.

Name: sbWidth

Class: Width

Command-Line Switch: -sbwidth

Specifies the width of the scrollbar in any of the forms accept-

able to Tk_GetPixels. The default width is 15 pixels..

Name: scrollMargin

Class: Margin

Command-Line Switch: -scrollmargin

Specifies the distance between the listbox and scrollbar in any

of the forms acceptable to Tk_GetPixels. The default is 3 pix- els.

Name: selectionCommand

Class: Command

Command-Line Switch: -selectioncommand

Specifies a Tcl command procedure which is called when an item is

selected. Selection policy does not matter.

Name: state

Class: State

Command-Line Switch: -state

Specifies one of two states for the listbox: normal or disabled.

If the listbox is disabled then selection is ignored. The

default is normal.

Name: textBackground

Class: Background

Command-Line Switch -textbackground

Specifies the background color for the listbox. This allows the

background within the listbox to be different from the normal background color.

Name: textFont

Class: Font

Command-Line Switch: -textfont

Specifies the font to be used for text in the listbox. This

allows for the font associated with text internal to the scrolled listbox to be different than the font for labels.

Name: visibleitems

Class: VisibleItems

Command-Line Switch: -visibleitems

Specifies the widthxheight in characters and lines for the list-

box. This option is only administered if the width and height options are both set to zero, otherwise they take precedence.

The default value is 20x10. With the visibleitems option

engaged, geometry constraints are maintained only on the listbox.

The size of the other components such as labels, margins, and

scroll bars, are additive and independent, effecting the overall size of the scrolled list box. In contrast, should the width and height options have non zero values, they are applied to the scrolled list box as a whole. The listbox is compressed or expanded to maintain the geometry constraints.

Name: vscrollMode

Class: ScrollMode

Command-Line Switch: -vscrollmode

Specifies the the display mode to be used for the vertical

scrollbar: static, dynamic, or none. In static mode, the scroll bar is displayed at all times. Dynamic mode displays the scroll bar as required, and none disables the scroll bar display. The default is static.

Name: width

Class: Width

Command-Line Switch: -width

Specifies the width of the scrolled list box as an entire unit.

The value may be specified in any of the forms acceptable to

Tk_GetPixels. Any additional space needed to display the other

components such as labels, margins, and scrollbars force the listbox to be compressed. A value of zero along with the same value for the height causes the value given for the visibleitems option to be applied which administers geometry constraints in a different manner. The default width is zero. _________________________________________________________________

Description

The scrolledlistbox command creates a scrolled listbox with addi-

tional options to manage horizontal and vertical scrollbars.

This includes options to control which scrollbars are displayed

and the method, i.e. statically or dynamically.

Methods

The scrolledlistbox command creates a new Tcl command whose name

is pathName. This command may be used to invoke various opera- tions on the widget. It has the following general form:

pathName option ?arg arg ...?

Option and the args determine the exact behavior of the command.

Many of the widget commands for a scrolledlistbox take as one

argument an indicator of which entry of the list box to operate on. These indicators are called indexes and may be specified in any of the following forms:

number
Specifies the element as a numerical index, where 0 corresponds to the first element in the listbox.
active
Indicates the element that has the location cursor. This element will be displayed with an underline when the listbox has the keyboard focus, and it is specified with the activate widget command.
anchor
Indicates the anchor point for the selection, which is set with the selection anchor widget command.
end
Indicates the end of the listbox. For some commands this means just after the last element; for other commands it means the last element.
@x,y
Indicates the element that covers the point in the listbox window specified by x and y (in pixel coordinates). If no element covers that point, then the closest element to that point is used.
pattern
If the index doesn't satisfy one of the above forms then this form is used. Pattern is pattern-matched against the items in the list box, in order from the top down, until a matching entry is found. The rules of Tcl_StringMatch are used.

The following widget commands are possible for scrolledlistbox

widgets:

Associated Methods

activate bbox curselection delete

get
index insert itemconfigure nearest scan see selection
size
xview yview

See the «listbox» manual entry for details on the associated

methods.

Widget-specific Methods

pathName cget option

Returns the current value of the configuration option given by

option. Option may have any of the values accepted by the scrolledlistbox command.
pathName clear

Clears the listbox of all items.

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 avail- able 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 scrolledlistbox command. pathName getcurselection

Returns the contents of the listbox element indicated by the cur-

rent selection indexes. Short cut version of get and curselec- tion command combination.
pathName justify direction

Justifies the list contents via teh scroll bars in one of four

directions: left, right, top, or bottom.
pathName selecteditemcount

Returns the number of items currently selected in the list.

pathName sort order

Sort the current list in either ascending or descending order.

The values increasing and decreasing are also accepted.

Components

Name: listbox

Class: listbox

The listbox component is the listbox widget. See the «listbox"

widget manual entry for details on the listbox component item.

Name: horizsb

Class: Scrollbar

The horizsb component is the horizontal scroll bar. See the

«scrollbar» widget manual entry for details on the horizsb compo- nent item.

Name: vertsb

Class: Scrollbar

The vertsb component is the vertical scroll bar. See the

«scrollbar» widget manual entry for details on the vertsb compo- nent item.

Example

option add *textBackground white
proc selCmd {} {
puts stdout «[.slb getcurselection]"
}
proc defCmd {} {
puts stdout «Double Click"
return [selCmd]
}
scrolledlistbox .slb -selection single \
-vscrollmode static -hscrollmode dynamic -labeltext «List» \ -selectioncommand selCmd -dblclickcommand defCmd pack .slb -padx 10 -pady 10 -fill both -expand yes .slb insert end {Hello {Out There} World}

Author

Mark L. Ulferts

Keywords

scrolledlistbox, listbox, widget

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