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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.
- #
- # 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
- }
-