| Current Path : /usr/share/tk8.5/ |
| Current File : //usr/share/tk8.5/listbox.tcl |
# listbox.tcl --
#
# This file defines the default bindings for Tk listbox widgets
# and provides procedures that help in implementing those bindings.
#
# RCS: @(#) $Id: listbox.tcl,v 1.18 2007/12/13 15:26:27 dgp Exp $
#
# Copyright (c) 1994 The Regents of the University of California.
# Copyright (c) 1994-1995 Sun Microsystems, Inc.
# Copyright (c) 1998 by Scriptics Corporation.
#
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
#--------------------------------------------------------------------------
# tk::Priv elements used in this file:
#
# afterId - Token returned by "after" for autoscanning.
# listboxPrev - The last element to be selected or deselected
# during a selection operation.
# listboxSelection - All of the items that were selected before the
# current selection operation (such as a mouse
# drag) started; used to cancel an operation.
#--------------------------------------------------------------------------
#-------------------------------------------------------------------------
# The code below creates the default class bindings for listboxes.
#-------------------------------------------------------------------------
# Note: the check for existence of %W below is because this binding
# is sometimes invoked after a window has been deleted (e.g. because
# there is a double-click binding on the widget that deletes it). Users
# can put "break"s in their bindings to avoid the error, but this check
# makes that unnecessary.
bind Listbox <1> {
if {[winfo exists %W]} {
tk::ListboxBeginSelect %W [%W index @%x,%y] 1
}
}
# Ignore double clicks so that users can define their own behaviors.
# Among other things, this prevents errors if the user deletes the
# listbox on a double click.
bind Listbox <Double-1> {
# Empty script
}
bind Listbox <B1-Motion> {
set tk::Priv(x) %x
set tk::Priv(y) %y
tk::ListboxMotion %W [%W index @%x,%y]
}
bind Listbox <ButtonRelease-1> {
tk::CancelRepeat
%W activate @%x,%y
}
bind Listbox <Shift-1> {
tk::ListboxBeginExtend %W [%W index @%x,%y]
}
bind Listbox <Control-1> {
tk::ListboxBeginToggle %W [%W index @%x,%y]
}
bind Listbox <B1-Leave> {
set tk::Priv(x) %x
set tk::Priv(y) %y
tk::ListboxAutoScan %W
}
bind Listbox <B1-Enter> {
tk::CancelRepeat
}
bind Listbox <Up> {
tk::ListboxUpDown %W -1
}
bind Listbox <Shift-Up> {
tk::ListboxExtendUpDown %W -1
}
bind Listbox <Down> {
tk::ListboxUpDown %W 1
}
bind Listbox <Shift-Down> {
tk::ListboxExtendUpDown %W 1
}
bind Listbox <Left> {
%W xview scroll -1 units
}
bind Listbox <Control-Left> {
%W xview scroll -1 pages
}
bind Listbox <Right> {
%W xview scroll 1 units
}
bind Listbox <Control-Right> {
%W xview scroll 1 pages
}
bind Listbox <Prior> {
%W yview scroll -1 pages
%W activate @0,0
}
bind Listbox <Next> {
%W yview scroll 1 pages
%W activate @0,0
}
bind Listbox <Control-Prior> {
%W xview scroll -1 pages
}
bind Listbox <Control-Next> {
%W xview scroll 1 pages
}
bind Listbox <Home> {
%W xview moveto 0
}
bind Listbox <End> {
%W xview moveto 1
}
bind Listbox <Control-Home> {
%W activate 0
%W see 0
%W selection clear 0 end
%W selection set 0
event generate %W <<ListboxSelect>>
}
bind Listbox <Shift-Control-Home> {
tk::ListboxDataExtend %W 0
}
bind Listbox <Control-End> {
%W activate end
%W see end
%W selection clear 0 end
%W selection set end
event generate %W <<ListboxSelect>>
}
bind Listbox <Shift-Control-End> {
tk::ListboxDataExtend %W [%W index end]
}
bind Listbox <<Copy>> {
if {[selection own -displayof %W] eq "%W"} {
clipboard clear -displayof %W
clipboard append -displayof %W [selection get -displayof %W]
}
}
bind Listbox <space> {
tk::ListboxBeginSelect %W [%W index active]
}
bind Listbox <Select> {
tk::ListboxBeginSelect %W [%W index active]
}
bind Listbox <Control-Shift-space> {
tk::ListboxBeginExtend %W [%W index active]
}
bind Listbox <Shift-Select> {
tk::ListboxBeginExtend %W [%W index active]
}
bind Listbox <Escape> {
tk::ListboxCancel %W
}
bind Listbox <Control-slash> {
tk::ListboxSelectAll %W
}
bind Listbox <Control-backslash> {
if {[%W cget -selectmode] ne "browse"} {
%W selection clear 0 end
event generate %W <<ListboxSelect>>
}
}
# Additional Tk bindings that aren't part of the Motif look and feel:
bind Listbox <2> {
%W scan mark %x %y
}
bind Listbox <B2-Motion> {
%W scan dragto %x %y
}
# The MouseWheel will typically only fire on Windows and Mac OS X.
# However, someone could use the "event generate" command to produce
# one on other platforms.
if {[tk windowingsystem] eq "aqua"} {
bind Listbox <MouseWheel> {
%W yview scroll [expr {- (%D)}] units
}
bind Listbox <Option-MouseWheel> {
%W yview scroll [expr {-10 * (%D)}] units
}
bind Listbox <Shift-MouseWheel> {
%W xview scroll [expr {- (%D)}] units
}
bind Listbox <Shift-Option-MouseWheel> {
%W xview scroll [expr {-10 * (%D)}] units
}
} else {
bind Listbox <MouseWheel> {
%W yview scroll [expr {- (%D / 120) * 4}] units
}
}
if {"x11" eq [tk windowingsystem]} {
# Support for mousewheels on Linux/Unix commonly comes through mapping
# the wheel to the extended buttons. If you have a mousewheel, find
# Linux configuration info at:
# http://www.inria.fr/koala/colas/mouse-wheel-scroll/
bind Listbox <4> {
if {!$tk_strictMotif} {
%W yview scroll -5 units
}
}
bind Listbox <5> {
if {!$tk_strictMotif} {
%W yview scroll 5 units
}
}
}
# ::tk::ListboxBeginSelect --
#
# This procedure is typically invoked on button-1 presses. It begins
# the process of making a selection in the listbox. Its exact behavior
# depends on the selection mode currently in effect for the listbox;
# see the Motif documentation for details.
#
# Arguments:
# w - The listbox widget.
# el - The element for the selection operation (typically the
# one under the pointer). Must be in numerical form.
proc ::tk::ListboxBeginSelect {w el {focus 1}} {
variable ::tk::Priv
if {[$w cget -selectmode] eq "multiple"} {
if {[$w selection includes $el]} {
$w selection clear $el
} else {
$w selection set $el
}
} else {
$w selection clear 0 end
$w selection set $el
$w selection anchor $el
set Priv(listboxSelection) {}
set Priv(listboxPrev) $el
}
event generate $w <<ListboxSelect>>
# check existence as ListboxSelect may destroy us
if {$focus && [winfo exists $w] && [$w cget -state] eq "normal"} {
focus $w
}
}
# ::tk::ListboxMotion --
#
# This procedure is called to process mouse motion events while
# button 1 is down. It may move or extend the selection, depending
# on the listbox's selection mode.
#
# Arguments:
# w - The listbox widget.
# el - The element under the pointer (must be a number).
proc ::tk::ListboxMotion {w el} {
variable ::tk::Priv
if {$el == $Priv(listboxPrev)} {
return
}
set anchor [$w index anchor]
switch [$w cget -selectmode] {
browse {
$w selection clear 0 end
$w selection set $el
set Priv(listboxPrev) $el
event generate $w <<ListboxSelect>>
}
extended {
set i $Priv(listboxPrev)
if {$i eq ""} {
set i $el
$w selection set $el
}
if {[$w selection includes anchor]} {
$w selection clear $i $el
$w selection set anchor $el
} else {
$w selection clear $i $el
$w selection clear anchor $el
}
if {![info exists Priv(listboxSelection)]} {
set Priv(listboxSelection) [$w curselection]
}
while {($i < $el) && ($i < $anchor)} {
if {[lsearch $Priv(listboxSelection) $i] >= 0} {
$w selection set $i
}
incr i
}
while {($i > $el) && ($i > $anchor)} {
if {[lsearch $Priv(listboxSelection) $i] >= 0} {
$w selection set $i
}
incr i -1
}
set Priv(listboxPrev) $el
event generate $w <<ListboxSelect>>
}
}
}
# ::tk::ListboxBeginExtend --
#
# This procedure is typically invoked on shift-button-1 presses. It
# begins the process of extending a selection in the listbox. Its
# exact behavior depends on the selection mode currently in effect
# for the listbox; see the Motif documentation for details.
#
# Arguments:
# w - The listbox widget.
# el - The element for the selection operation (typically the
# one under the pointer). Must be in numerical form.
proc ::tk::ListboxBeginExtend {w el} {
if {[$w cget -selectmode] eq "extended"} {
if {[$w selection includes anchor]} {
ListboxMotion $w $el
} else {
# No selection yet; simulate the begin-select operation.
ListboxBeginSelect $w $el
}
}
}
# ::tk::ListboxBeginToggle --
#
# This procedure is typically invoked on control-button-1 presses. It
# begins the process of toggling a selection in the listbox. Its
# exact behavior depends on the selection mode currently in effect
# for the listbox; see the Motif documentation for details.
#
# Arguments:
# w - The listbox widget.
# el - The element for the selection operation (typically the
# one under the pointer). Must be in numerical form.
proc ::tk::ListboxBeginToggle {w el} {
variable ::tk::Priv
if {[$w cget -selectmode] eq "extended"} {
set Priv(listboxSelection) [$w curselection]
set Priv(listboxPrev) $el
$w selection anchor $el
if {[$w selection includes $el]} {
$w selection clear $el
} else {
$w selection set $el
}
event generate $w <<ListboxSelect>>
}
}
# ::tk::ListboxAutoScan --
# This procedure is invoked when the mouse leaves an entry window
# with button 1 down. It scrolls the window up, down, left, or
# right, depending on where the mouse left the window, and reschedules
# itself as an "after" command so that the window continues to scroll until
# the mouse moves back into the window or the mouse button is released.
#
# Arguments:
# w - The entry window.
proc ::tk::ListboxAutoScan {w} {
variable ::tk::Priv
if {![winfo exists $w]} return
set x $Priv(x)
set y $Priv(y)
if {$y >= [winfo height $w]} {
$w yview scroll 1 units
} elseif {$y < 0} {
$w yview scroll -1 units
} elseif {$x >= [winfo width $w]} {
$w xview scroll 2 units
} elseif {$x < 0} {
$w xview scroll -2 units
} else {
return
}
ListboxMotion $w [$w index @$x,$y]
set Priv(afterId) [after 50 [list tk::ListboxAutoScan $w]]
}
# ::tk::ListboxUpDown --
#
# Moves the location cursor (active element) up or down by one element,
# and changes the selection if we're in browse or extended selection
# mode.
#
# Arguments:
# w - The listbox widget.
# amount - +1 to move down one item, -1 to move back one item.
proc ::tk::ListboxUpDown {w amount} {
variable ::tk::Priv
$w activate [expr {[$w index active] + $amount}]
$w see active
switch [$w cget -selectmode] {
browse {
$w selection clear 0 end
$w selection set active
event generate $w <<ListboxSelect>>
}
extended {
$w selection clear 0 end
$w selection set active
$w selection anchor active
set Priv(listboxPrev) [$w index active]
set Priv(listboxSelection) {}
event generate $w <<ListboxSelect>>
}
}
}
# ::tk::ListboxExtendUpDown --
#
# Does nothing unless we're in extended selection mode; in this
# case it moves the location cursor (active element) up or down by
# one element, and extends the selection to that point.
#
# Arguments:
# w - The listbox widget.
# amount - +1 to move down one item, -1 to move back one item.
proc ::tk::ListboxExtendUpDown {w amount} {
variable ::tk::Priv
if {[$w cget -selectmode] ne "extended"} {
return
}
set active [$w index active]
if {![info exists Priv(listboxSelection)]} {
$w selection set $active
set Priv(listboxSelection) [$w curselection]
}
$w activate [expr {$active + $amount}]
$w see active
ListboxMotion $w [$w index active]
}
# ::tk::ListboxDataExtend
#
# This procedure is called for key-presses such as Shift-KEndData.
# If the selection mode isn't multiple or extend then it does nothing.
# Otherwise it moves the active element to el and, if we're in
# extended mode, extends the selection to that point.
#
# Arguments:
# w - The listbox widget.
# el - An integer element number.
proc ::tk::ListboxDataExtend {w el} {
set mode [$w cget -selectmode]
if {$mode eq "extended"} {
$w activate $el
$w see $el
if {[$w selection includes anchor]} {
ListboxMotion $w $el
}
} elseif {$mode eq "multiple"} {
$w activate $el
$w see $el
}
}
# ::tk::ListboxCancel
#
# This procedure is invoked to cancel an extended selection in
# progress. If there is an extended selection in progress, it
# restores all of the items between the active one and the anchor
# to their previous selection state.
#
# Arguments:
# w - The listbox widget.
proc ::tk::ListboxCancel w {
variable ::tk::Priv
if {[$w cget -selectmode] ne "extended"} {
return
}
set first [$w index anchor]
set last $Priv(listboxPrev)
if {$last eq ""} {
# Not actually doing any selection right now
return
}
if {$first > $last} {
set tmp $first
set first $last
set last $tmp
}
$w selection clear $first $last
while {$first <= $last} {
if {[lsearch $Priv(listboxSelection) $first] >= 0} {
$w selection set $first
}
incr first
}
event generate $w <<ListboxSelect>>
}
# ::tk::ListboxSelectAll
#
# This procedure is invoked to handle the "select all" operation.
# For single and browse mode, it just selects the active element.
# Otherwise it selects everything in the widget.
#
# Arguments:
# w - The listbox widget.
proc ::tk::ListboxSelectAll w {
set mode [$w cget -selectmode]
if {$mode eq "single" || $mode eq "browse"} {
$w selection clear 0 end
$w selection set active
} else {
$w selection set 0 end
}
event generate $w <<ListboxSelect>>
}
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