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text.tcl
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# text.tcl --
#
# This file defines the default bindings for Tk text widgets and provides
# procedures that help in implementing the bindings.
#
# SCCS: @(#) text.tcl 1.46 96/08/23 14:07:32
#
# Copyright (c) 1992-1994 The Regents of the University of California.
# Copyright (c) 1994-1996 Sun Microsystems, Inc.
#
# 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 entries.
#-------------------------------------------------------------------------
# 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.first}
}
bind Text <Triple-1> {
set tkPriv(selectMode) line
tkTextSelectTo %W %x %y
catch {%W mark set insert 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
}
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 <ButtonRelease-2> {
if {!$tkPriv(mouseMoved) || $tk_strictMotif} {
tkTextPaste %W %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 [%W index {insert - 1c wordstart}]
}
bind Text <Control-Right> {
tkTextSetCursor %W [%W index {insert wordend}]
}
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 [%W index {insert - 1c wordstart}]
}
bind Text <Shift-Control-Right> {
tkTextKeySelect %W [%W index {insert wordend}]
}
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> {
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.
}
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 {[%W tag nextrange sel 1.0 end] != ""} {
%W delete sel.first sel.last
} else {
%W delete insert
%W see insert
}
}
bind Text <BackSpace> {
if {[%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>> {
%W delete sel.first sel.last
}
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}
# 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 !$tk_strictMotif {
tkTextTranspose %W
}
}
bind Text <Control-v> {
if !$tk_strictMotif {
tkTextScrollPages %W 1
}
}
bind Text <Meta-b> {
if !$tk_strictMotif {
tkTextSetCursor %W {insert - 1c wordstart}
}
}
bind Text <Meta-d> {
if !$tk_strictMotif {
%W delete insert {insert wordend}
}
}
bind Text <Meta-f> {
if !$tk_strictMotif {
tkTextSetCursor %W {insert wordend}
}
}
bind Text <Meta-less> {
if !$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 {insert -1c wordstart} insert
}
}
bind Text <Meta-Delete> {
if !$tk_strictMotif {
%W delete {insert -1c wordstart} insert
}
}
# A few additional bindings of my own.
bind Text <Control-h> {
if !$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 $tkPriv(mouseMoved) {
%W scan dragto %x %y
}
}
}
set tkPriv(prevPos) {}
# tkTextClosestGap --
# Given x and y coordinates, this procedure finds the closest boundary
# between characters to the given coordinates and returns the index
# of the character just after the boundary.
#
# Arguments:
# w - The text window.
# x - X-coordinate within the window.
# y - Y-coordinate within the window.
proc tkTextClosestGap {w x y} {
set pos [$w index @$x,$y]
set bbox [$w bbox $pos]
if ![string compare $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]
$w mark set anchor insert
if {[$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} {
global tkPriv
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 $cur < anchor] {
set first [$w index "$cur wordstart"]
set last [$w index "anchor - 1c wordend"]
} else {
set first [$w index "anchor wordstart"]
set last [$w index "$cur -1c wordend"]
}
}
line {
if [$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) || ($tkPriv(selectMode) != "char")} {
$w tag remove sel 0.0 $first
$w tag add sel $first $last
$w tag remove sel $last end
update idletasks
}
}
# tkTextKeyExtend --
# This procedure handles extending the selection from the keyboard,
# where the point to extend to is really the boundary between two
# characters rather than a particular character.
#
# Arguments:
# w - The text window.
# index - The point to which the selection is to be extended.
proc tkTextKeyExtend {w index} {
global tkPriv
set cur [$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 $w]}
if {[$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 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
$w see insert
}
# tkTextKeySelect
# This procedure is invoked when stroking out selections using the
# keyboard. It moves the cursor to a new position, then extends
# the selection to that position.
#
# Arguments:
# w - The text window.
# new - A new position for the insertion cursor (the cursor hasn't
# actually been moved to this position yet).
proc tkTextKeySelect {w new} {
global tkPriv
if {[$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
$w see insert
update idletasks
}
# tkTextResetAnchor --
# Set the selection anchor to whichever end is farthest from the
# index argument. One special trick: if the selection has two or
# fewer characters, just leave the anchor where it is. In this
# case it doesn't matter which point gets chosen for the anchor,
# and for the things like Shift-Left and Shift-Right this produces
# better behavior when the cursor moves back and forth across the
# anchor.
#
# Arguments:
# w - The text widget.
# index - Position at which mouse button was pressed, which determines
# which end of selection should be used as anchor point.
proc tkTextResetAnchor {w index} {
global tkPriv
if {[$w tag ranges sel] == ""} {
$w mark set anchor $index
return
}
set a [$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 {
$w mark set anchor sel.first
}
}
# tkTextInsert --
# Insert a string into a text at the point of the insertion cursor.
# If there is a selection in the text, and it covers the point of the
# insertion cursor, then delete the selection before inserting.
#
# Arguments:
# w - The text window in which to insert the string
# s - The string to insert (usually just a single character)
proc tkTextInsert {w s} {
if {($s == "") || ([$w cget -state] == "disabled")} {
return
}
catch {
if {[$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] != 0} {
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 "$pos linestart"]
while 1 {
if {(([$w get "$pos - 1 line"] == "\n") && ([$w get $pos] != "\n"))
|| ($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 $pos != insert] || ($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 "$start linestart + 1 line"]
while {[$w get $pos] != "\n"} {
if [$w compare $pos == end] {
return [$w index "end - 1c"]
}
set pos [$w index "$pos + 1 line"]
}
while {[$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 $count pages
if {$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 {[selection own -displayof $w] == "$w"} {
clipboard clear -displayof $w
catch {
clipboard append -displayof $w [selection get -displayof $w]
}
}
}
# 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 {[selection own -displayof $w] == "$w"} {
clipboard clear -displayof $w
catch {
clipboard append -displayof $w [selection get -displayof $w]
$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 {
catch {
$w insert insert [selection get -displayof $w \
-selection CLIPBOARD]
}
}