Listbox Options (Mastering Perl/Tk)

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7.2. Listbox Options

As with any of the widgets, you can configure the Listbox using options. The standard widget options are -cursor, -font, -height, -highlightbackground,-highlightcolor, -highlightthickness, -takefocus, -width, -xscrollcommand, and -yscrollcommand. The options specific to Listbox widgets will be further discussed later in this chapter.

-background => color: Sets the color of the area behind the text.
-borderwidth => amount: Sets the width of the edges of the widget. Default is 2.
-cursor => cursorname: Sets the cursor to display when the mouse is over the Listbox.
-exportselection => 0 | 1: Determines if the current Listbox selection is made available for the X selection as well. If set to 1, prevents two Listboxes from having selections at the same time.
-font => fontname: Sets the font of any text displayed within the Listbox.
-foreground => color: Sets the color of nonselected text displayed in the Listbox.
-height => amount: Sets the height of the Listbox.
-highlightbackground => color: Sets the color the highlight rectangle should be when the Listbox does not have the keyboard focus.
-highlightcolor => color: Sets the color the highlight rectangle should be when the Listbox does have the keyboard focus.
-highlightthickness => amount: Sets the thickness of the highlight rectangle. Default is 2.
-relief => 'flat'|'groove'|'raised'|'ridge'|'sunken'|'solid': Sets the relief of the edges of the Listbox.
-selectbackground => color: Sets the color behind any selected text.
-selectborderwidth => amount: Sets the width of the border around any selected text.
-selectforeground => color: Sets the color of the text in any selected items.
-selectmode => "single" | "browse" | "multiple" | "extended": Affects how many items can be selected at once; also affects some key/mouse bindings for the Listbox (such as Shift-select).
-setgrid => 0 | 1: Turns gridding off or on for the Listbox. Default is 0.
-takefocus => 0 | 1 | undef: Determines whether the widget can have keyboard focus. 0 means never, 1 means always, undef means dynamic decision.
-width => amount: Sets the width of the Listbox in characters. If amount is 0 or less, the Listbox is made as wide as the longest item.
-xscrollcommand => callback: Assigns a horizontal Scrollbar to widget. See Chapter 6, "The Scrollbar Widget".
-yscrollcommand => callback: Assigns a vertical Scrollbar to widget. See Chapter 6, "The Scrollbar Widget".


7. The Listbox Widget		7.3. Selection Modes