Прога / tina-2.5.2 / tcl / lib / tk8.3 / text

# text.tcl --
#
# This file defines the default bindings for Tk text widgets and provides
# procedures that help in implementing the bindings.
#
# RCS: @(#) $Id: text.tcl,v 1.12.2.1 2001/04/04 07:57:17 hobbs Exp $
#
# Copyright (c) 1992-1994 The Regents of the University of California.
# Copyright (c) 1994-1997 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.
#

#-------------------------------------------------------------------------
# Elements of tkPriv that are used in this file:
#
# afterId - If non-null, it means that auto-scanning is underway
# and it gives the "after" id for the next auto-scan
# command to be executed.
# char - Character position on the line; kept in order
# to allow moving up or down past short lines while
# still remembering the desired position.
# mouseMoved - Non-zero means the mouse has moved a significant
# amount since the button went down (so, for example,
# start dragging out a selection).
# prevPos - Used when moving up or down lines via the keyboard.
# Keeps track of the previous insert position, so
# we can distinguish a series of ups and downs, all
# in a row, from a new up or down.
# selectMode - The style of selection currently underway:
# char, word, or line.
# x, y - Last known mouse coordinates for scanning
# and auto-scanning.
#-------------------------------------------------------------------------

#-------------------------------------------------------------------------
# The code below creates the default class bindings for text widgets.
#-------------------------------------------------------------------------

# Standard Motif bindings:

bind Text <1> {
tkTextButton1 %W %x %y
%W tag remove sel 0.0 end
}
bind Text <B1-Motion> {
set tkPriv(x) %x
set tkPriv(y) %y
tkTextSelectTo %W %x %y
}
bind Text <Double-1> {
set tkPriv(selectMode) word
tkTextSelectTo %W %x %y
catch {%W mark set insert sel.last}
catch {%W mark set anchor sel.first}
}
bind Text <Triple-1> {
set tkPriv(selectMode) line
tkTextSelectTo %W %x %y
catch {%W mark set insert sel.last}
catch {%W mark set anchor sel.first}
}
bind Text <Shift-1> {
tkTextResetAnchor %W @%x,%y
set tkPriv(selectMode) char
tkTextSelectTo %W %x %y
}
bind Text <Double-Shift-1> {
set tkPriv(selectMode) word
tkTextSelectTo %W %x %y 1
}
bind Text <Triple-Shift-1> {
set tkPriv(selectMode) line
tkTextSelectTo %W %x %y
}
bind Text <B1-Leave> {
set tkPriv(x) %x
set tkPriv(y) %y
tkTextAutoScan %W
}
bind Text <B1-Enter> {
tkCancelRepeat
}
bind Text <ButtonRelease-1> {
tkCancelRepeat
}
bind Text <Control-1> {
%W mark set insert @%x,%y
}
bind Text <Left> {
tkTextSetCursor %W insert-1c
}
bind Text <Right> {
tkTextSetCursor %W insert+1c
}
bind Text <Up> {
tkTextSetCursor %W [tkTextUpDownLine %W -1]
}
bind Text <Down> {
tkTextSetCursor %W [tkTextUpDownLine %W 1]
}
bind Text <Shift-Left> {
tkTextKeySelect %W [%W index {insert - 1c}]
}
bind Text <Shift-Right> {
tkTextKeySelect %W [%W index {insert + 1c}]
}
bind Text <Shift-Up> {
tkTextKeySelect %W [tkTextUpDownLine %W -1]
}
bind Text <Shift-Down> {
tkTextKeySelect %W [tkTextUpDownLine %W 1]
}
bind Text <Control-Left> {
tkTextSetCursor %W [tkTextPrevPos %W insert tcl_startOfPreviousWord]
}
bind Text <Control-Right> {
tkTextSetCursor %W [tkTextNextWord %W insert]
}
bind Text <Control-Up> {
tkTextSetCursor %W [tkTextPrevPara %W insert]
}
bind Text <Control-Down> {
tkTextSetCursor %W [tkTextNextPara %W insert]
}
bind Text <Shift-Control-Left> {
tkTextKeySelect %W [tkTextPrevPos %W insert tcl_startOfPreviousWord]
}
bind Text <Shift-Control-Right> {
tkTextKeySelect %W [tkTextNextWord %W insert]
}
bind Text <Shift-Control-Up> {
tkTextKeySelect %W [tkTextPrevPara %W insert]
}
bind Text <Shift-Control-Down> {
tkTextKeySelect %W [tkTextNextPara %W insert]
}
bind Text <Prior> {
tkTextSetCursor %W [tkTextScrollPages %W -1]
}
bind Text <Shift-Prior> {
tkTextKeySelect %W [tkTextScrollPages %W -1]
}
bind Text <Next> {
tkTextSetCursor %W [tkTextScrollPages %W 1]
}
bind Text <Shift-Next> {
tkTextKeySelect %W [tkTextScrollPages %W 1]
}
bind Text <Control-Prior> {
%W xview scroll -1 page
}
bind Text <Control-Next> {
%W xview scroll 1 page
}

bind Text <Home> {
tkTextSetCursor %W {insert linestart}
}
bind Text <Shift-Home> {
tkTextKeySelect %W {insert linestart}
}
bind Text <End> {
tkTextSetCursor %W {insert lineend}
}
bind Text <Shift-End> {
tkTextKeySelect %W {insert lineend}
}
bind Text <Control-Home> {
tkTextSetCursor %W 1.0
}
bind Text <Control-Shift-Home> {
tkTextKeySelect %W 1.0
}
bind Text <Control-End> {
tkTextSetCursor %W {end - 1 char}
}
bind Text <Control-Shift-End> {
tkTextKeySelect %W {end - 1 char}
}

bind Text <Tab> {
if { [string equal [%W cget -state] "normal"] } {
tkTextInsert %W \t
focus %W
break
}
}
bind Text <Shift-Tab> {
# Needed only to keep <Tab> binding from triggering; doesn't
# have to actually do anything.
break
}
bind Text <Control-Tab> {
focus [tk_focusNext %W]
}
bind Text <Control-Shift-Tab> {
focus [tk_focusPrev %W]
}
bind Text <Control-i> {
tkTextInsert %W \t
}
bind Text <Return> {
tkTextInsert %W \n
}
bind Text <Delete> {
if {[string compare [%W tag nextrange sel 1.0 end] ""]} {
%W delete sel.first sel.last
} else {
%W delete insert
%W see insert
}
}
bind Text <BackSpace> {
if {[string compare [%W tag nextrange sel 1.0 end] ""]} {
%W delete sel.first sel.last
} elseif {[%W compare insert != 1.0]} {
%W delete insert-1c
%W see insert
}
}

bind Text <Control-space> {
%W mark set anchor insert
}
bind Text <Select> {
%W mark set anchor insert
}
bind Text <Control-Shift-space> {
set tkPriv(selectMode) char
tkTextKeyExtend %W insert
}
bind Text <Shift-Select> {
set tkPriv(selectMode) char
tkTextKeyExtend %W insert
}
bind Text <Control-slash> {
%W tag add sel 1.0 end
}
bind Text <Control-backslash> {
%W tag remove sel 1.0 end
}
bind Text <<Cut>> {
tk_textCut %W
}
bind Text <<Copy>> {
tk_textCopy %W
}
bind Text <<Paste>> {
tk_textPaste %W
}
bind Text <<Clear>> {
catch {%W delete sel.first sel.last}
}
bind Text <<PasteSelection>> {
if {!$tkPriv(mouseMoved) || $tk_strictMotif} {
tkTextPaste %W %x %y
}
}
bind Text <Insert> {
catch {tkTextInsert %W [selection get -displayof %W]}
}
bind Text <KeyPress> {
tkTextInsert %W %A
}

# Ignore all Alt, Meta, and Control keypresses unless explicitly bound.
# Otherwise, if a widget binding for one of these is defined, the
# <KeyPress> class binding will also fire and insert the character,
# which is wrong. Ditto for <Escape>.

bind Text <Alt-KeyPress> {# nothing }
bind Text <Meta-KeyPress> {# nothing}
bind Text <Control-KeyPress> {# nothing}
bind Text <Escape> {# nothing}
bind Text <KP_Enter> {# nothing}
if {[string equal $tcl_platform(platform) "macintosh"]} {
bind Text <Command-KeyPress> {# nothing}
}

# Additional emacs-like bindings:

bind Text <Control-a> {
if {!$tk_strictMotif} {
tkTextSetCursor %W {insert linestart}
}
}
bind Text <Control-b> {
if {!$tk_strictMotif} {
tkTextSetCursor %W insert-1c
}
}
bind Text <Control-d> {
if {!$tk_strictMotif} {
%W delete insert
}
}
bind Text <Control-e> {
if {!$tk_strictMotif} {
tkTextSetCursor %W {insert lineend}
}
}
bind Text <Control-f> {
if {!$tk_strictMotif} {
tkTextSetCursor %W insert+1c
}
}
bind Text <Control-k> {
if {!$tk_strictMotif} {
if {[%W compare insert == {insert lineend}]} {
%W delete insert
} else {
%W delete insert {insert lineend}
}
}
}
bind Text <Control-n> {
if {!$tk_strictMotif} {
tkTextSetCursor %W [tkTextUpDownLine %W 1]
}
}
bind Text <Control-o> {
if {!$tk_strictMotif} {
%W insert insert \n
%W mark set insert insert-1c
}
}
bind Text <Control-p> {
if {!$tk_strictMotif} {
tkTextSetCursor %W [tkTextUpDownLine %W -1]
}
}
bind Text <Control-t> {
if {!$tk_strictMotif} {
tkTextTranspose %W
}
}

if {[string compare $tcl_platform(platform) "windows"]} {
bind Text <Control-v> {
if {!$tk_strictMotif} {
tkTextScrollPages %W 1
}
}
}

bind Text <Meta-b> {
if {!$tk_strictMotif} {
tkTextSetCursor %W [tkTextPrevPos %W insert tcl_startOfPreviousWord]
}
}
bind Text <Meta-d> {
if {!$tk_strictMotif} {
%W delete insert [tkTextNextWord %W insert]
}
}
bind Text <Meta-f> {
if {!$tk_strictMotif} {
tkTextSetCursor %W [tkTextNextWord %W insert]
}
}
bind Text <Meta-less> {
if {!$tk_strictMotif} {
tkTextSetCursor %W 1.0
}
}
bind Text <Meta-greater> {
if {!$tk_strictMotif} {
tkTextSetCursor %W end-1c
}
}
bind Text <Meta-BackSpace> {
if {!$tk_strictMotif} {
%W delete [tkTextPrevPos %W insert tcl_startOfPreviousWord] insert
}
}
bind Text <Meta-Delete> {
if {!$tk_strictMotif} {
%W delete [tkTextPrevPos %W insert tcl_startOfPreviousWord] insert
}
}

# Macintosh only bindings:

# if text black & highlight black -> text white, other text the same
if {[string equal $tcl_platform(platform) "macintosh"]} {
bind Text <FocusIn> {
%W tag configure sel -borderwidth 0
%W configure -selectbackground systemHighlight -selectforeground systemHighlightText
}
bind Text <FocusOut> {
%W tag configure sel -borderwidth 1
%W configure -selectbackground white -selectforeground black
}
bind Text <Option-Left> {
tkTextSetCursor %W [tkTextPrevPos %W insert tcl_startOfPreviousWord]
}
bind Text <Option-Right> {
tkTextSetCursor %W [tkTextNextWord %W insert]
}
bind Text <Option-Up> {
tkTextSetCursor %W [tkTextPrevPara %W insert]
}
bind Text <Option-Down> {
tkTextSetCursor %W [tkTextNextPara %W insert]
}
bind Text <Shift-Option-Left> {
tkTextKeySelect %W [tkTextPrevPos %W insert tcl_startOfPreviousWord]
}
bind Text <Shift-Option-Right> {
tkTextKeySelect %W [tkTextNextWord %W insert]
}
bind Text <Shift-Option-Up> {
tkTextKeySelect %W [tkTextPrevPara %W insert]
}
bind Text <Shift-Option-Down> {
tkTextKeySelect %W [tkTextNextPara %W insert]
}

# End of Mac only bindings
}

# A few additional bindings of my own.

bind Text <Control-h> {
if {!$tk_strictMotif} {
if {[%W compare insert != 1.0]} {
%W delete insert-1c
%W see insert
}
}
}
bind Text <2> {
if {!$tk_strictMotif} {
%W scan mark %x %y
set tkPriv(x) %x
set tkPriv(y) %y
set tkPriv(mouseMoved) 0
}
}
bind Text <B2-Motion> {
if {!$tk_strictMotif} {
if {(%x != $tkPriv(x)) || (%y != $tkPriv(y))} {
set tkPriv(mouseMoved) 1
}
if {$tkPriv(mouseMoved)} {
%W scan dragto %x %y
}
}
}
set tkPriv(prevPos) {}

# The MouseWheel will typically only fire on Windows. However,
# someone could use the "event generate" command to produce one
# on other platforms.

bind Text <MouseWheel> {
%W yview scroll [expr {- (%D / 120) * 4}] units
}

if {[string equal "unix" $tcl_platform(platform)]} {
# Support for mousewheels on Linux/Unix commonly comes through mapping
# the wheel to the extended buttons. If you have a mousewheel, find
# Linux configuration info at:
# http://www.inria.fr/koala/colas/mouse-wheel-scroll/
bind Text <4> {
if {!$tk_strictMotif} {
%W yview scroll -5 units
}
}
bind Text <5> {
if {!$tk_strictMotif} {
%W yview scroll 5 units
}
}
}

# tkTextClosestGap --
# Given x and y coordinates, this procedure finds the closest boundary
# between characters to the given coordinates and returns the index
# of the character just after the boundary.
#
# Arguments:
# w - The text window.
# x - X-coordinate within the window.
# y - Y-coordinate within the window.

proc tkTextClosestGap {w x y} {
set pos [$w index @$x,$y]
set bbox [$w bbox $pos]
if {[string equal $bbox ""]} {
return $pos
}
if {($x - [lindex $bbox 0]) < ([lindex $bbox 2]/2)} {
return $pos
}
$w index "$pos + 1 char"
}

# tkTextButton1 --
# This procedure is invoked to handle button-1 presses in text
# widgets. It moves the insertion cursor, sets the selection anchor,
# and claims the input focus.
#
# Arguments:
# w - The text window in which the button was pressed.
# x - The x-coordinate of the button press.
# y - The x-coordinate of the button press.

proc tkTextButton1 {w x y} {
global tkPriv

set tkPriv(selectMode) char
set tkPriv(mouseMoved) 0
set tkPriv(pressX) $x
$w mark set insert [tkTextClosestGap $w $x $y]
$w mark set anchor insert
if {[string equal [$w cget -state] "normal"]} {focus $w}
}

# tkTextSelectTo --
# This procedure is invoked to extend the selection, typically when
# dragging it with the mouse. Depending on the selection mode (character,
# word, line) it selects in different-sized units. This procedure
# ignores mouse motions initially until the mouse has moved from
# one character to another or until there have been multiple clicks.
#
# Arguments:
# w - The text window in which the button was pressed.
# x - Mouse x position.
# y - Mouse y position.

proc tkTextSelectTo {w x y {extend 0}} {
global tkPriv tcl_platform

set cur [tkTextClosestGap $w $x $y]
if {[catch {$w index anchor}]} {
$w mark set anchor $cur
}
set anchor [$w index anchor]
if {[$w compare $cur != $anchor] || (abs($tkPriv(pressX) - $x) >= 3)} {
set tkPriv(mouseMoved) 1
}
switch $tkPriv(selectMode) {
char {
if {[$w compare $cur < anchor]} {
set first $cur
set last anchor
} else {
set first anchor
set last $cur
}
}
word {
if {[$w compare $cur < anchor]} {
set first [tkTextPrevPos $w "$cur + 1c" tcl_wordBreakBefore]
if { !$extend } {
set last [tkTextNextPos $w "anchor" tcl_wordBreakAfter]
} else {
set last anchor
}
} else {
set last [tkTextNextPos $w "$cur - 1c" tcl_wordBreakAfter]
if { !$extend } {
set first [tkTextPrevPos $w anchor tcl_wordBreakBefore]
} else {
set first anchor
}
}
}
line {
if {[$w compare $cur < anchor]} {
set first [$w index "$cur linestart"]
set last [$w index "anchor - 1c lineend + 1c"]
} else {
set first [$w index "anchor linestart"]
set last [$w index "$cur lineend + 1c"]
}
}
}
if {$tkPriv(mouseMoved) || [string compare $tkPriv(selectMode) "char"]} {
$w tag remove sel 0.0 end
$w mark set insert $cur
$w tag add sel $first $last
update idletasks
}
}

# tkTextKeyExtend --
# This procedure handles extending the selection from the keyboard,
# where the point to extend to is really the boundary between two
# characters rather than a particular character.
#
# Arguments:
# w - The text window.
# index - The point to which the selection is to be extended.

proc tkTextKeyExtend {w index} {
global tkPriv

set cur [$w index $index]
if {[catch {$w index anchor}]} {
$w mark set anchor $cur
}
set anchor [$w index anchor]
if {[$w compare $cur < anchor]} {
set first $cur
set last anchor
} else {
set first anchor
set last $cur
}
$w tag remove sel 0.0 $first
$w tag add sel $first $last
$w tag remove sel $last end
}

# tkTextPaste --
# This procedure sets the insertion cursor to the mouse position,
# inserts the selection, and sets the focus to the window.
#
# Arguments:
# w - The text window.
# x, y - Position of the mouse.

proc tkTextPaste {w x y} {
$w mark set insert [tkTextClosestGap $w $x $y]
catch {$w insert insert [selection get -displayof $w]}
if {[string equal [$w cget -state] "normal"]} {focus $w}
}

# tkTextAutoScan --
# This procedure is invoked when the mouse leaves a text window
# with button 1 down. It scrolls the window up, down, left, or right,
# depending on where the mouse is (this information was saved in
# tkPriv(x) and tkPriv(y)), 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 text window.

proc tkTextAutoScan {w} {
global tkPriv
if {![winfo exists $w]} return
if {$tkPriv(y) >= [winfo height $w]} {
$w yview scroll 2 units
} elseif {$tkPriv(y) < 0} {
$w yview scroll -2 units
} elseif {$tkPriv(x) >= [winfo width $w]} {
$w xview scroll 2 units
} elseif {$tkPriv(x) < 0} {
$w xview scroll -2 units
} else {
return
}
tkTextSelectTo $w $tkPriv(x) $tkPriv(y)
set tkPriv(afterId) [after 50 [list tkTextAutoScan $w]]
}

# tkTextSetCursor
# Move the insertion cursor to a given position in a text. Also
# clears the selection, if there is one in the text, and makes sure
# that the insertion cursor is visible. Also, don't let the insertion
# cursor appear on the dummy last line of the text.
#
# Arguments:
# w - The text window.
# pos - The desired new position for the cursor in the window.

proc tkTextSetCursor {w pos} {
global tkPriv

if {[$w compare $pos == end]} {
set pos {end - 1 chars}
}
$w mark set insert $pos
$w tag remove sel 1.0 end
$w see insert
}

# tkTextKeySelect
# This procedure is invoked when stroking out selections using the
# keyboard. It moves the cursor to a new position, then extends
# the selection to that position.
#
# Arguments:
# w - The text window.
# new - A new position for the insertion cursor (the cursor hasn't
# actually been moved to this position yet).

proc tkTextKeySelect {w new} {
global tkPriv

if {[string equal [$w tag nextrange sel 1.0 end] ""]} {
if {[$w compare $new < insert]} {
$w tag add sel $new insert
} else {
$w tag add sel insert $new
}
$w mark set anchor insert
} else {
if {[$w compare $new < anchor]} {
set first $new
set last anchor
} else {
set first anchor
set last $new
}
$w tag remove sel 1.0 $first
$w tag add sel $first $last
$w tag remove sel $last end
}
$w mark set insert $new
$w see insert
update idletasks
}

# tkTextResetAnchor --
# Set the selection anchor to whichever end is farthest from the
# index argument. One special trick: if the selection has two or
# fewer characters, just leave the anchor where it is. In this
# case it doesn't matter which point gets chosen for the anchor,
# and for the things like Shift-Left and Shift-Right this produces
# better behavior when the cursor moves back and forth across the
# anchor.
#
# Arguments:
# w - The text widget.
# index - Position at which mouse button was pressed, which determines
# which end of selection should be used as anchor point.

proc tkTextResetAnchor {w index} {
global tkPriv

if {[string equal [$w tag ranges sel] ""]} {
# Don't move the anchor if there is no selection now; this makes
# the widget behave "correctly" when the user clicks once, then
# shift-clicks somewhere -- ie, the area between the two clicks will be
# selected. [Bug: 5929].
return
}
set a [$w index $index]
set b [$w index sel.first]
set c [$w index sel.last]
if {[$w compare $a < $b]} {
$w mark set anchor sel.last
return
}
if {[$w compare $a > $c]} {
$w mark set anchor sel.first
return
}
scan $a "%d.%d" lineA chA
scan $b "%d.%d" lineB chB
scan $c "%d.%d" lineC chC
if {$lineB < $lineC+2} {
set total [string length [$w get $b $c]]
if {$total <= 2} {
return
}
if {[string length [$w get $b $a]] < ($total/2)} {
$w mark set anchor sel.last
} else {
$w mark set anchor sel.first
}
return
}
if {($lineA-$lineB) < ($lineC-$lineA)} {
$w mark set anchor sel.last
} else {
$w mark set anchor sel.first
}
}

# tkTextInsert --
# Insert a string into a text at the point of the insertion cursor.
# If there is a selection in the text, and it covers the point of the
# insertion cursor, then delete the selection before inserting.
#
# Arguments:
# w - The text window in which to insert the string
# s - The string to insert (usually just a single character)

proc tkTextInsert {w s} {
if {[string equal $s ""] || [string equal [$w cget -state] "disabled"]} {
return
}
catch {
if {[$w compare sel.first <= insert] \
&& [$w compare sel.last >= insert]} {
$w delete sel.first sel.last
}
}
$w insert insert $s
$w see insert
}

# tkTextUpDownLine --
# Returns the index of the character one line above or below the
# insertion cursor. There are two tricky things here. First,
# we want to maintain the original column across repeated operations,
# even though some lines that will get passed through don't have
# enough characters to cover the original column. Second, don't
# try to scroll past the beginning or end of the text.
#
# Arguments:
# w - The text window in which the cursor is to move.
# n - The number of lines to move: -1 for up one line,
# +1 for down one line.

proc tkTextUpDownLine {w n} {
global tkPriv

set i [$w index insert]
scan $i "%d.%d" line char
if {[string compare $tkPriv(prevPos) $i]} {
set tkPriv(char) $char
}
set new [$w index [expr {$line + $n}].$tkPriv(char)]
if {[$w compare $new == end] || [$w compare $new == "insert linestart"]} {
set new $i
}
set tkPriv(prevPos) $new
return $new
}

# tkTextPrevPara --
# Returns the index of the beginning of the paragraph just before a given
# position in the text (the beginning of a paragraph is the first non-blank
# character after a blank line).
#
# Arguments:
# w - The text window in which the cursor is to move.
# pos - Position at which to start search.

proc tkTextPrevPara {w pos} {
set pos [$w index "$pos linestart"]
while {1} {
if {([string equal [$w get "$pos - 1 line"] "\n"] \
&& [string compare [$w get $pos] "\n"]) \
|| [string equal $pos "1.0"]} {
if {[regexp -indices {^[ ]+(.)} [$w get $pos "$pos lineend"] \
dummy index]} {
set pos [$w index "$pos + [lindex $index 0] chars"]
}
if {[$w compare $pos != insert] || [string equal $pos 1.0]} {
return $pos
}
}
set pos [$w index "$pos - 1 line"]
}
}

# tkTextNextPara --
# Returns the index of the beginning of the paragraph just after a given
# position in the text (the beginning of a paragraph is the first non-blank
# character after a blank line).
#
# Arguments:
# w - The text window in which the cursor is to move.
# start - Position at which to start search.

proc tkTextNextPara {w start} {
set pos [$w index "$start linestart + 1 line"]
while {[string compare [$w get $pos] "\n"]} {
if {[$w compare $pos == end]} {
return [$w index "end - 1c"]
}
set pos [$w index "$pos + 1 line"]
}
while {[string equal [$w get $pos] "\n"]} {
set pos [$w index "$pos + 1 line"]
if {[$w compare $pos == end]} {
return [$w index "end - 1c"]
}
}
if {[regexp -indices {^[ ]+(.)} [$w get $pos "$pos lineend"] \
dummy index]} {
return [$w index "$pos + [lindex $index 0] chars"]
}
return $pos
}

# tkTextScrollPages --
# This is a utility procedure used in bindings for moving up and down
# pages and possibly extending the selection along the way. It scrolls
# the view in the widget by the number of pages, and it returns the
# index of the character that is at the same position in the new view
# as the insertion cursor used to be in the old view.
#
# Arguments:
# w - The text window in which the cursor is to move.
# count - Number of pages forward to scroll; may be negative
# to scroll backwards.

proc tkTextScrollPages {w count} {
set bbox [$w bbox insert]
$w yview scroll $count pages
if {[string equal $bbox ""]} {
return [$w index @[expr {[winfo height $w]/2}],0]
}
return [$w index @[lindex $bbox 0],[lindex $bbox 1]]
}

# tkTextTranspose --
# This procedure implements the "transpose" function for text widgets.
# It tranposes the characters on either side of the insertion cursor,
# unless the cursor is at the end of the line. In this case it
# transposes the two characters to the left of the cursor. In either
# case, the cursor ends up to the right of the transposed characters.
#
# Arguments:
# w - Text window in which to transpose.

proc tkTextTranspose w {
set pos insert
if {[$w compare $pos != "$pos lineend"]} {
set pos [$w index "$pos + 1 char"]
}
set new [$w get "$pos - 1 char"][$w get "$pos - 2 char"]
if {[$w compare "$pos - 1 char" == 1.0]} {
return
}
$w delete "$pos - 2 char" $pos
$w insert insert $new
$w see insert
}

# tk_textCopy --
# This procedure copies the selection from a text widget into the
# clipboard.
#
# Arguments:
# w - Name of a text widget.

proc tk_textCopy w {
if {![catch {set data [$w get sel.first sel.last]}]} {
clipboard clear -displayof $w
clipboard append -displayof $w $data
}
}

# tk_textCut --
# This procedure copies the selection from a text widget into the
# clipboard, then deletes the selection (if it exists in the given
# widget).
#
# Arguments:
# w - Name of a text widget.

proc tk_textCut w {
if {![catch {set data [$w get sel.first sel.last]}]} {
clipboard clear -displayof $w
clipboard append -displayof $w $data
$w delete sel.first sel.last
}
}

# tk_textPaste --
# This procedure pastes the contents of the clipboard to the insertion
# point in a text widget.
#
# Arguments:
# w - Name of a text widget.

proc tk_textPaste w {
global tcl_platform
catch {
if {[string compare $tcl_platform(platform) "unix"]} {
catch {
$w delete sel.first sel.last
}
}
$w insert insert [selection get -displayof $w -selection CLIPBOARD]
}
}

# tkTextNextWord --
# Returns the index of the next word position after a given position in the
# text. The next word is platform dependent and may be either the next
# end-of-word position or the next start-of-word position after the next
# end-of-word position.
#
# Arguments:
# w - The text window in which the cursor is to move.
# start - Position at which to start search.

if {[string equal $tcl_platform(platform) "windows"]} {
proc tkTextNextWord {w start} {
tkTextNextPos $w [tkTextNextPos $w $start tcl_endOfWord] \
tcl_startOfNextWord
}
} else {
proc tkTextNextWord {w start} {
tkTextNextPos $w $start tcl_endOfWord
}
}

# tkTextNextPos --
# Returns the index of the next position after the given starting
# position in the text as computed by a specified function.
#
# Arguments:
# w - The text window in which the cursor is to move.
# start - Position at which to start search.
# op - Function to use to find next position.

proc tkTextNextPos {w start op} {
set text ""
set cur $start
while {[$w compare $cur < end]} {
set text $text[$w get $cur "$cur lineend + 1c"]
set pos [$op $text 0]
if {$pos >= 0} {
## Adjust for embedded windows and images
## dump gives us 3 items per window/image
set dump [$w dump -image -window $start "$start + $pos c"]
if {[llength $dump]} {
set pos [expr {$pos + ([llength $dump]/3)}]
}
return [$w index "$start + $pos c"]
}
set cur [$w index "$cur lineend +1c"]
}
return end
}

# tkTextPrevPos --
# Returns the index of the previous position before the given starting
# position in the text as computed by a specified function.
#
# Arguments:
# w - The text window in which the cursor is to move.
# start - Position at which to start search.
# op - Function to use to find next position.

proc tkTextPrevPos {w start op} {
set text ""
set cur $start
while {[$w compare $cur > 0.0]} {
set text [$w get "$cur linestart - 1c" $cur]$text
set pos [$op $text end]
if {$pos >= 0} {
## Adjust for embedded windows and images
## dump gives us 3 items per window/image
set dump [$w dump -image -window "$cur linestart" "$start - 1c"]
if {[llength $dump]} {
## This is a hokey extra hack for control-arrow movement
## that should be in a while loop to be correct (hobbs)
if {[$w compare [lindex $dump 2] > \
"$cur linestart - 1c + $pos c"]} {
incr pos -1
}
set pos [expr {$pos + ([llength $dump]/3)}]
}
return [$w index "$cur linestart - 1c + $pos c"]
}
set cur [$w index "$cur linestart - 1c"]
}
return 0.0
}