ListBox

NAME: ListBox - ListBox widget

CREATION: ListBox pathName ?option value...?

STANDARD OPTIONS

-background or -bg	-borderwidth or -bd
-cursor
-highlightbackground
-highlightcolor
-highlightthickness
-relief
-selectbackground
-selectforeground
-takefocus
-xscrollcommand
-yscrollcommand

WIDGET-SPECIFIC OPTIONS

-deltax

-deltay

-dragenabled

-dragendcmd

-dragevent

-draginitcmd

-dragtype

-dropcmd

-dropenabled

-dropovercmd

-dropovermode

-droptypes

-height

-multicolumn

-padx

-redraw

-width

WIDGET COMMAND: pathName bindImage event script; pathName bindText event script; pathName cget option; pathName configure ?option? ?value option value ...?; pathName delete ?arg...?; pathName edit item text ?verifycmd? ?clickres? ?select?; pathName exists item; pathName index item; pathName insert index item ?option value...?; pathName item first ?last?; pathName itemcget item option; pathName itemconfigure item ?option? ?value option value ...?; pathName items ?first? ?last?; pathName move item index; pathName reorder neworder; pathName see item; pathName selection cmd ?arg...?; pathName xview ?arg...?; pathName yview ?arg...?

DESCRIPTION

ListBox widget uses canvas to display a list of items. Each item is composed of a label with its own font and foreground attributes, and an optional image or window. Each item is drawn in a single line, whose height is defined by the deltay option, so they must have at most this height. A item is uniquely identified by a string given at creation (by the insert command). The ListBox can have one or more columns, depending on multicolumn option. The user do not handle columns; the number of columns is determined following the height of the ListBox in order to see each item vertically.

WIDGET-SPECIFIC OPTIONS

-deltax: Specifies horizontal pad between each columns.

-deltay: Specifies vertical size of the items.

-dragenabled: A boolean specifying if drag is enabled.

-dragendcmd: Specifies a command to be called when drag ended. dragendcmd must be a command conforming to the description of the option dragendcmd of DragSite::register.

-dragevent: Specifies the number of the mouse button associated to the drag. Must be 1, 2 or 3.

-draginitcmd

ListBox has a command wrapper for drag-init events. This command refused the drag if no item is designated. In other cases:
If draginitcmd is empty, it returns:

the value of option dragtype or LISTBOX_ITEM if empty as the data type,
{move copy link} as the operations,
the item identifier as the data.

If draginitcmd is not empty, it is called with the following arguments:

the pathname of the listbox,
the identifier of the dragged item,
the toplevel created to represent dragged data.

and must return a value conforming to draginitcmd option described in DragSite::register.

-dragtype: Specifies an alternate type of dragged object.

-dropcmd

ListBox has a command wrapper for drop events. This command stops auto scrolling and extract item and position.
If dropcmd is not empty, it is called with the following arguments:

the pathname of the listbox,
the pathname of the drag source,
a list describing where the drop occurs. It can be:
- {widget},
- {item item} or
- {position index}.
the current operation,
the data type,
the data.

-dropenabled: A boolean specifying if drop is enabled.

-dropovercmd

LsitBox has a command wrapper for drag-over events. This command enables auto scrolling and position extraction during the drag-over. If dropovercmd is not empty, the command is called with the following aguments:

the pathname of the listbox,
the pathname of the drag source,
a list describing where the drop can occur, whose elements are:
- the string widget if dropovertype option contains w, else empty string.
- the targeted item if drag icon points an item and dropovertype option contains i, else empty string.
- an index within two items where drag icon points to if dropovertype option contains p, else empty string.
- optionally, the preferred method if drop can occur both inside an item and between two items. The value is position or item.
the current operation,
the data type,
the data.

The command must return a list with two elements:

the drop status, conforming to those described in dropovercmd option of DropSite::register,
the choosen method: widget, item or position.

-dropovermode: Specifies the type of drop-over interaction. Must be a combination of w, which specifies that drop can occurs everywhere on widget, p, which specifies that drop can occurs between two items, and i, which specifies that drop occurs inside items.

-droptypes: Specifies a list of accepted dropped object/operation. See option droptypes of DropSite::register. for more infromation.
Default is LISTBOX_ITEM with operations copy and move.

-height: Specifies the desired height for the listbox in units of deltay pixels.

-multicolumn: Specifies wether or not ListBox layouts items in order to see each one vertically.

-padx: Specifies distance between image or window and text of the items.

-redraw: Specifies wether or not the listbox should be redrawn when entering idle. Set it to false if you call update while modifying the listbox.

-width: Specifies the desired width for the listbox in units of 8 pixels.

WIDGET COMMAND

pathName bindImage event script: This command associates a command to execute whenever the event sequence given by event occurs on the image of a item. The item idenfier on which the event occurs is appended to the command.

pathName bindText event script: This command associates a command to execute whenever the event sequence given by event occurs on the label of a item. The item idenfier on which the event occurs is appended to the command.

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

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. 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 creation command. Read-only options are not be modified.

pathName delete ?arg...?: Deletes all items in arg. arg can be a list of items or a list of list of items. To delete all items, do $pathName delete [$pathName items].

pathName edit item text ?verifycmd? ?clickres? ?select?: Provides a way for the user to edit in place the label of an item.
The command takes the initial text as argument and does not modify the label of the edited node, but returns an empty string if edition is canceled, or the typed text if edition is accepted.
When editing, the user can cancel by pressing Escape, or accept by pressing Return.
clickres specifies what to do if the user click outside the editable area. If clickres is 0 (the default), the edition is canceled. If clickres is 1, the edition is accepted. In all other case, the edition continues.
If edition is accepted and modifycmd is not empty, then it is called with the new text as argument and must return 1 to accept the new text, 0 to refuse it and continue edition.
select specifies wether or not the initial text should be selected. Default is 1.

pathName exists item: Returns 1 if item exists in the listbox, else 0.

pathName index item: Returns the position of item in the list.

pathName insert index item ?option value...?

Inserts a new item identified by item in the list at position index.

-data: User data associated to the item.

-fill: Specifies the foreground color of the label of the item.

-font: Specifies a font for the label of the item.

-image: Specifies an image to display at the left of the label of the item. window option override image.

-indent: Specifies the amount of extra space in pixels at the left of the item.

-text: Specifies the label of the item.

-window: Specifies a pathname to display at the left of the label of the item. window option override image.

pathName item first ?last?: Its use is deprecated. Use items instead.
If last is omitted, returns the item at index first in the list, or an empty string if first refers to a non-existent element. If last is specified, the command returns a list whose elements are all of the items between first and last, inclusive. Both first and last may have any of the standard forms for indices.

pathName itemcget item option: Returns the current value of a configuration option for the item. Option may have any of the values accepted by the item creation command.

pathName itemconfigure item ?option? ?value option value ...?: This command is similar to the configure command, except that it applies to the options for an individual item, whereas configure applies to the options for the widget as a whole. Options may have any of the values accepted by the item creation widget command. If options are specified, options are modified as indicated in the command and the command returns an empty string. If no options are specified, returns a list describing the current options for the item. Read-only options are not be modified.

pathName items ?first? ?last?: If first and last are omitted, returns the list of all items. If first is specified and last omitted, returns the item at index first, or an empty string if first refers to a non-existent element. If first and last are specified, the command returns a list whose elements are all of the items between first and last, inclusive. Both first and last may have any of the standard forms for indices.

pathName move item index: Moves item at position index in the list.

pathName reorder neworder: Modifies the order of items in the listbox given by neworder. Items that do not appear in neworder are no moved.

pathName see item: Arrange the scrolling area to make item visible.

pathName selection cmd ?arg...?

Modifies the list of selected items following cmd:

clear: remove all items of the selection.
set: set the selection to all items in arg
add: add all items of arg in the selection
remove: remove all items of arg of the selection
get: return the current selected items

pathName xview ?arg...?: Standard command to enable horizontal scrolling of pathName.

pathName yview ?arg...?: Standard command to enable vertical scrolling of pathName.