TList(3pm) User Contributed Perl Documentation TList(3pm)NAMETk::TList - Create and manipulate Tix Tabular List widgets
SYNOPSIS
$tlist = $parent->TList(?options?);
SUPER-CLASS
None.
STANDARD OPTIONS-background-borderwidth-class-cursor-foreground
-font-height-highlightcolor-highlightthickness
-relief-selectbackground-selectforeground
-xscrollcommand-yscrollcommand-width
See Tk::options for details of the standard options.
WIDGET-SPECIFIC OPTIONS
Name: browsecmd
Class: BrowseCmd
Switch: -browsecmd
Specifies a perl/Tk callback to be executed when the user browses
through the entries in the TList widget.
Name: command
Class: Command
Switch: -command
Specifies the perl/Tk callback to be executed when the user invokes
a list entry in the TList widget. Normally the user invokes a list
entry by double-clicking it or pressing the Return key.
Name: foreground
Class: Foreground
Switch: -foreground
Alias: -fg
Specifies the default foreground color for the list entries.
Name: height
Class: Height
Switch: -height
Specifies the desired height for the window in number of
characters.
Name: itemType
Class: ItemType
Switch: -itemtype
Specifies the default type of display item for this TList widget.
When you call the insert methods, display items of this type will
be created if the -itemtype option is not specified.
Name: orient
Class: Orient
Switch: -orient
Specifies the order of tabularizing the list entries. When set to
"vertical", the entries are arranged in a column, from top to
bottom. If the entries cannot be contained in one column, the
remaining entries will go to the next column, and so on. When set
to "horizontal", the entries are arranged in a row, from left to
right. If the entries cannot be contained in one row, the remaining
entries will go to the next row, and so on.
Name: padX
Class: Pad
Switch: -padx
The default horizontal padding for list entries.
Name: padY
Class: Pad
Switch: -padx
The default vertical padding for list entries.
Name: selectBackground
Class: SelectBackground
Switch: -selectbackground
Specifies the background color for the selected list entries.
Name: selectBorderWidth
Class: BorderWidth
Switch: -selectborderwidth
Specifies a non-negative value indicating the width of the 3-D
border to draw around selected items. The value may have any of
the forms acceptable to Tk_GetPixels.
Name: selectForeground
Class: SelectForeground
Switch: -selectforeground
Specifies the foreground color for the selected list entries.
Name: selectMode
Class: SelectMode
Switch: -selectmode
Specifies one of several styles for manipulating the selection.
The value of the option may be arbitrary, but the default bindings
expect it to be either single, browse, multiple, or extended; the
default value is single.
Name: sizeCmd
Class: SizeCmd
Switch: -sizecmd
Specifies a perl/Tk callback to be called whenever the TList widget
changes its size. This command can be useful to implement "user
scroll bars when needed" features.
Name: state
Class: State
Switch: -state
Specifies whether the TList command should react to user actions.
When set to "normal", the TList reacts to user actions in the
normal way. When set to "disabled", the TList can only be scrolled,
but its entries cannot be selected or activated.
Name: width
Class: Width
Switch: -width
Specifies the desired width for the window in characters.
DESCRIPTION
The TList method creates a new window (given by the $widget argument)
and makes it into a TList widget. Additional options, described above,
may be specified on the command line or in the option database to
configure aspects of the TList widget such as its cursor and relief.
The TList widget can be used to display data in a tabular format. The
list entries of a TList widget are similar to the entries in the Tk
listbox widget. The main differences are (1) the TList widget can
display the list entries in a two dimensional format and (2) you can
use graphical images as well as multiple colors and fonts for the list
entries.
Each list entry is identified by an index, which can be in the
following forms:
number
An integer that indicates the position of the entry in the list. 0
means the first position, 1 means the second position, and so on.
end Indicates the end of the listbox. For some commands this means just
after the last entry; for other commands it means the last entry.
@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.
DISPLAY ITEMS
Each list entry in an TList widget is associated with a display item.
The display item determines what visual information should be displayed
for this list entry. Please see Tk::DItem for a list of all display
items.
When a list entry is created by the insert command, the type of its
display item is determined by the -itemtype option passed to these
commands. If the -itemtype is omitted, then by default the type
specified by this TList widget's -itemtype option is used.
WIDGET METHODS
The TList method creates a widget object.
This object supports the configure and cget methods described in
Tk::options which can be used to enquire and modify the options
described above. The widget also inherits all the methods provided by
the generic Tk::Widget class.
The following additional methods are available for TList widgets:
$tlist->anchorSet(index)
Sets the anchor to the list entry identified by index. The anchor
is the end of the selection that is fixed while dragging out a
selection with the mouse.
$tlist->anchorClear
Removes the anchor, if any, from this TList widget. This only
removes the surrounding highlights of the anchor entry and does not
affect its selection status.
$tlist->delete(from, ?to?)
Deletes one or more list entries between the two entries specified
by the indices from and to. If to is not specified, deletes the
single entry specified by from.
$tlist->dragsiteSet(index)
Sets the dragsite to the list entry identified by index. The
dragsite is used to indicate the source of a drag-and-drop action.
Currently drag-and-drop functionality has not been implemented in
Tix yet.
$tlist->dragsiteClear
Remove the dragsite, if any, from the this TList widget. This only
removes the surrounding highlights of the dragsite entry and does
not affect its selection status.
$tlist->dropsiteSet(index)
Sets the dropsite to the list entry identified by index. The
dropsite is used to indicate the target of a drag-and-drop action.
Currently drag-and-drop functionality has not been implemented in
Tix yet.
$tlist->dropsiteClear
Remove the dropsite, if any, from the this TList widget. This only
removes the surrounding highlights of the dropsite entry and does
not affect its selection status.
$tlist->entrycget(index, option)
Returns the current value of the configuration option given by
option for the entry indentfied by index. Option may have any of
the values accepted by the insert method.
$tlist->entryconfigure(index, ?option?, ?value, option, value, ...?)
Query or modify the configuration options of the list entry
identified by index. If no option is specified, returns a list
describing all of the available options for index (see
Tk_ConfigureInfo for information on the format of this list). If
option is specified with no value, then the method 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 option(s) to have the given
value(s); in this case the method returns an empty string. Option
may have any of the values accepted by the insert method. The exact
set of options depends on the value of the -itemtype option passed
to the the insert method when this list entry is created.
$tlist->insert(index, ?option, value, ...?)
Creates a new list entry at the position indicated by index. The
following configuration options can be given to configure the list
entry:
-itemtype => type
Specifies the type of display item to be display for the
new list entry. type must be a valid display item type.
Currently the available display item types are image,
imagetext, text, and $widget. If this option is not
specified, then by default the type specified by this TList
widget's -itemtype option is used.
-state => state
Specifies whether this entry can be selected or invoked by
the user. Must be either normal or disabled.
-data => data
Arbitrary data to be associated with the entry (a perl
scalar value).
The insert method accepts additional configuration options to
configure the display item associated with this list entry. The set
of additional configuration options depends on the type of the
display item given by the -itemtype option. Please see Tk::DItem
for a list of the configuration options for each of the display
item types.
$tlist->info(option, arg, ...)
Query information about the TList widget. option can be one of the
following:
$tlist->info(anchor, index)
Returns the index of the current anchor, if any, of the
TList widget. If the anchor is not set, returns the empty
string.
$tlist->info(dragsite, index)
Returns the index of the current dragsite, if any, of the
TList widget. If the dragsite is not set, returns the empty
string.
$tlist->info(dropsite, index)
Returns the index of the current dropsite, if any, of the
TList widget. If the dropsite is not set, returns the empty
string.
$tlist->info(selection)
Returns a list of selected elements in the TList widget. If
no entries are selected, returns an empty string.
$tlist->nearest(x, y)
Given an (x,y) coordinate within the TList window, this command
returns the index of the TList element nearest to that coordinate.
$tlist->see(index)
Adjust the view in the TList so that the entry given by index is
visible. If the entry is already visible then the command has no
effect; otherwise TList scrolls to bring the element into view at
the edge to which it is nearest.
$tlist->selection(option, arg, ...)
This command is used to adjust the selection within a TList widget.
It has several forms, depending on option:
$tlist->selectionClear(?from?, ?to?)
When no extra arguments are given, deselects all of the
list entrie(s) in this TList widget. When only from is
given, only the list entry identified by from is
deselected. When both from and to are given, deselects all
of the list entrie(s) between between from and to,
inclusive, without affecting the selection state of entries
outside that range.
$tlist->selectionIncludes(index)
Returns 1 if the list entry indicated by index is currently
selected; returns 0 otherwise.
$tlist->selectionSet(from, ?to?)
Selects all of the list entrie(s) between between from and
to, inclusive, without affecting the selection state of
entries outside that range. When only from is given, only
the list entry identified by from is selected.
$tlist->xview(args)
This command is used to query and change the horizontal position of
the information in the widget's window. It can take any of the
following forms:
$tlist->xview
Returns a list containing two elements. Each element is a
real fraction between 0 and 1; together they describe the
horizontal span that is visible in the window. For
example, if the first element is 0.2 and the second element
is 0.6, 20% of the TList entry is off-screen to the left,
the middle 40% is visible in the window, and 40% of the
entry is off-screen to the right. These are the same values
passed to scrollbars via the -xscrollcommand option.
$tlist->xview(index)
Adjusts the view in the window so that the list entry
identified by index is aligned to the left edge of the
window.
$tlist->xviewMoveto(fraction)
Adjusts the view in the window so that fraction of the
total width of the TList is off-screen to the left.
fraction must be a fraction between 0 and 1.
$tlist->xviewScroll(number, what)
This command shifts the view in the window left or right
according to number and what. Number must be an integer.
What must be either units or pages or an abbreviation of
one of these. If what is units, the view adjusts left or
right by number character units (the width of the 0
character) on the display; if it is pages then the view
adjusts by number screenfuls. If number is negative then
characters farther to the left become visible; if it is
positive then characters farther to the right become
visible.
$tlist->yview(?args?)
This command is used to query and change the vertical position of
the entries in the widget's window. It can take any of the
following forms:
$tlist->yview
Returns a list containing two elements, both of which are
real fractions between 0 and 1. The first element gives
the position of the list element at the top of the window,
relative to the TList as a whole (0.5 means it is halfway
through the TList, for example). The second element gives
the position of the list entry just after the last one in
the window, relative to the TList as a whole. These are
the same values passed to scrollbars via the
-yscrollcommand option.
$tlist->yview(index)
Adjusts the view in the window so that the list entry given
by index is displayed at the top of the window.
$tlist->yviewMoveto(fraction)
Adjusts the view in the window so that the list entry given
by fraction appears at the top of the window. Fraction is a
fraction between 0 and 1; 0 indicates the first entry in
the TList, 0.33 indicates the entry one-third the way
through the TList, and so on.
$tlist->yviewScroll(number, what)
This command adjust the view in the window up or down
according to number and what. Number must be an integer.
What must be either units or pages. If what is units, the
view adjusts up or down by number lines; if it is pages
then the view adjusts by number screenfuls. If number is
negative then earlier entries become visible; if it is
positive then later entries become visible.
BINDINGS
[1] If the -selectmode is "browse", when the user drags the mouse
pointer over the list entries, the entry under the pointer will be
highlighted and the -browsecmd procedure will be called with one
parameter, the index of the highlighted entry. Only one entry can
be highlighted at a time. The -command procedure will be called
when the user double-clicks on a list entry.
[2] If the -selectmode is "single", the entries will only be
highlighted by mouse <ButtonRelease-1> events. When a new list
entry is highlighted, the -browsecmd procedure will be called with
one parameter indicating the highlighted list entry. The -command
procedure will be called when the user double-clicks on a list
entry.
[3] If the -selectmode is "multiple", when the user drags the mouse
pointer over the list entries, all the entries under the pointer
will be highlighted. However, only a contiguous region of list
entries can be selected. When the highlighted area is changed, the
-browsecmd procedure will be called with an undefined parameter. It
is the responsibility of the -browsecmd procedure to find out the
exact highlighted selection in the TList. The -command procedure
will be called when the user double-clicks on a list entry.
[4] If the -selectmode is "extended", when the user drags the mouse
pointer over the list entries, all the entries under the pointer
will be highlighted. The user can also make disjointed selections
using <Control-ButtonPress-1>. When the highlighted area is
changed, the -browsecmd procedure will be called with an undefined
parameter. It is the responsibility of the -browsecmd procedure to
find out the exact highlighted selection in the TList. The -command
procedure will be called when the user double-clicks on a list
entry.
EXAMPLE
This example demonstrates how to use an TList to store a list of
numbers:
use strict;
use Tk ();
use Tk::TList;
my $mw = Tk::MainWindow->new();
my $image = $mw->Getimage('folder');
my $tlist = $mw->TList(-orient => 'vertical');
for my $text ( qw/one two three four five six seven eight nine/ ) {
$tlist->insert('end',
-itemtype=>'imagetext', -image=>$image, -text=>$text);
}
$tlist->pack(-expand=>'yes', -fill=>'both');
Tk::MainLoop;
SEE ALSO
Tk::options Tk::Widget Tk::DItem Tk::HList Tk::TixGrid
KEYWORDSTix(n), Tabular Listbox, Display Items
perl v5.26.0 2017-07-22 TList(3pm)
