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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.
+#
+# 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 ::tk::Priv 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 <Map> {
+ if {[tk windowingsystem] eq "aqua"} {
+ ::tk::RegisterServiceWidget %W
+ }
+}
+
+bind Text <1> {
+ tk::TextButton1 %W %x %y
+ %W tag remove sel 0.0 end
+}
+bind Text <B1-Motion> {
+ set tk::Priv(x) %x
+ set tk::Priv(y) %y
+ tk::TextSelectTo %W %x %y
+}
+bind Text <Double-1> {
+ set tk::Priv(selectMode) word
+ tk::TextSelectTo %W %x %y
+ catch {%W mark set insert sel.first}
+}
+bind Text <Triple-1> {
+ set tk::Priv(selectMode) line
+ tk::TextSelectTo %W %x %y
+ catch {%W mark set insert sel.first}
+}
+bind Text <Shift-1> {
+ tk::TextResetAnchor %W @%x,%y
+ set tk::Priv(selectMode) char
+ tk::TextSelectTo %W %x %y
+}
+bind Text <Double-Shift-1> {
+ set tk::Priv(selectMode) word
+ tk::TextSelectTo %W %x %y 1
+}
+bind Text <Triple-Shift-1> {
+ set tk::Priv(selectMode) line
+ tk::TextSelectTo %W %x %y
+}
+bind Text <B1-Leave> {
+ set tk::Priv(x) %x
+ set tk::Priv(y) %y
+ tk::TextAutoScan %W
+}
+bind Text <B1-Enter> {
+ tk::CancelRepeat
+}
+bind Text <ButtonRelease-1> {
+ tk::CancelRepeat
+}
+
+bind Text <Control-1> {
+ %W mark set insert @%x,%y
+ # An operation that moves the insert mark without making it
+ # one end of the selection must insert an autoseparator
+ if {[%W cget -autoseparators]} {
+ %W edit separator
+ }
+}
+# stop an accidental double click triggering <Double-Button-1>
+bind Text <Double-Control-1> { # nothing }
+# stop an accidental movement triggering <B1-Motion>
+bind Text <Control-B1-Motion> { # nothing }
+bind Text <<PrevChar>> {
+ tk::TextSetCursor %W insert-1displayindices
+}
+bind Text <<NextChar>> {
+ tk::TextSetCursor %W insert+1displayindices
+}
+bind Text <<PrevLine>> {
+ tk::TextSetCursor %W [tk::TextUpDownLine %W -1]
+}
+bind Text <<NextLine>> {
+ tk::TextSetCursor %W [tk::TextUpDownLine %W 1]
+}
+bind Text <<SelectPrevChar>> {
+ tk::TextKeySelect %W [%W index {insert - 1displayindices}]
+}
+bind Text <<SelectNextChar>> {
+ tk::TextKeySelect %W [%W index {insert + 1displayindices}]
+}
+bind Text <<SelectPrevLine>> {
+ tk::TextKeySelect %W [tk::TextUpDownLine %W -1]
+}
+bind Text <<SelectNextLine>> {
+ tk::TextKeySelect %W [tk::TextUpDownLine %W 1]
+}
+bind Text <<PrevWord>> {
+ tk::TextSetCursor %W [tk::TextPrevPos %W insert tcl_startOfPreviousWord]
+}
+bind Text <<NextWord>> {
+ tk::TextSetCursor %W [tk::TextNextWord %W insert]
+}
+bind Text <<PrevPara>> {
+ tk::TextSetCursor %W [tk::TextPrevPara %W insert]
+}
+bind Text <<NextPara>> {
+ tk::TextSetCursor %W [tk::TextNextPara %W insert]
+}
+bind Text <<SelectPrevWord>> {
+ tk::TextKeySelect %W [tk::TextPrevPos %W insert tcl_startOfPreviousWord]
+}
+bind Text <<SelectNextWord>> {
+ tk::TextKeySelect %W [tk::TextNextWord %W insert]
+}
+bind Text <<SelectPrevPara>> {
+ tk::TextKeySelect %W [tk::TextPrevPara %W insert]
+}
+bind Text <<SelectNextPara>> {
+ tk::TextKeySelect %W [tk::TextNextPara %W insert]
+}
+bind Text <Prior> {
+ tk::TextSetCursor %W [tk::TextScrollPages %W -1]
+}
+bind Text <Shift-Prior> {
+ tk::TextKeySelect %W [tk::TextScrollPages %W -1]
+}
+bind Text <Next> {
+ tk::TextSetCursor %W [tk::TextScrollPages %W 1]
+}
+bind Text <Shift-Next> {
+ tk::TextKeySelect %W [tk::TextScrollPages %W 1]
+}
+bind Text <Control-Prior> {
+ %W xview scroll -1 page
+}
+bind Text <Control-Next> {
+ %W xview scroll 1 page
+}
+
+bind Text <<LineStart>> {
+ tk::TextSetCursor %W {insert display linestart}
+}
+bind Text <<SelectLineStart>> {
+ tk::TextKeySelect %W {insert display linestart}
+}
+bind Text <<LineEnd>> {
+ tk::TextSetCursor %W {insert display lineend}
+}
+bind Text <<SelectLineEnd>> {
+ tk::TextKeySelect %W {insert display lineend}
+}
+bind Text <Control-Home> {
+ tk::TextSetCursor %W 1.0
+}
+bind Text <Control-Shift-Home> {
+ tk::TextKeySelect %W 1.0
+}
+bind Text <Control-End> {
+ tk::TextSetCursor %W {end - 1 indices}
+}
+bind Text <Control-Shift-End> {
+ tk::TextKeySelect %W {end - 1 indices}
+}
+
+bind Text <Tab> {
+ if {[%W cget -state] eq "normal"} {
+ tk::TextInsert %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> {
+ tk::TextInsert %W \t
+}
+bind Text <Return> {
+ tk::TextInsert %W \n
+ if {[%W cget -autoseparators]} {
+ %W edit separator
+ }
+}
+bind Text <Delete> {
+ if {[tk::TextCursorInSelection %W]} {
+ %W delete sel.first sel.last
+ } else {
+ if {[%W compare end != insert+1c]} {
+ %W delete insert
+ }
+ %W see insert
+ }
+}
+bind Text <BackSpace> {
+ if {[tk::TextCursorInSelection %W]} {
+ %W delete sel.first sel.last
+ } else {
+ if {[%W compare insert != 1.0]} {
+ %W delete insert-1c
+ }
+ %W see insert
+ }
+}
+
+bind Text <Control-space> {
+ %W mark set [tk::TextAnchor %W] insert
+}
+bind Text <Select> {
+ %W mark set [tk::TextAnchor %W] insert
+}
+bind Text <Control-Shift-space> {
+ set tk::Priv(selectMode) char
+ tk::TextKeyExtend %W insert
+}
+bind Text <Shift-Select> {
+ set tk::Priv(selectMode) char
+ tk::TextKeyExtend %W insert
+}
+bind Text <<SelectAll>> {
+ %W tag add sel 1.0 end
+}
+bind Text <<SelectNone>> {
+ %W tag remove sel 1.0 end
+ # An operation that clears the selection must insert an autoseparator,
+ # because the selection operation may have moved the insert mark
+ if {[%W cget -autoseparators]} {
+ %W edit separator
+ }
+}
+bind Text <<Cut>> {
+ tk_textCut %W
+}
+bind Text <<Copy>> {
+ tk_textCopy %W
+}
+bind Text <<Paste>> {
+ tk_textPaste %W
+}
+bind Text <<Clear>> {
+ # Make <<Clear>> an atomic operation on the Undo stack,
+ # i.e. separate it from other delete operations on either side
+ if {[%W cget -autoseparators]} {
+ %W edit separator
+ }
+ catch {%W delete sel.first sel.last}
+ if {[%W cget -autoseparators]} {
+ %W edit separator
+ }
+}
+bind Text <<PasteSelection>> {
+ if {$tk_strictMotif || ![info exists tk::Priv(mouseMoved)]
+ || !$tk::Priv(mouseMoved)} {
+ tk::TextPasteSelection %W %x %y
+ }
+}
+bind Text <Insert> {
+ catch {tk::TextInsert %W [::tk::GetSelection %W PRIMARY]}
+}
+bind Text <KeyPress> {
+ tk::TextInsert %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 {[tk windowingsystem] eq "aqua"} {
+ bind Text <Command-KeyPress> {# nothing}
+}
+
+# Additional emacs-like bindings:
+
+bind Text <Control-d> {
+ if {!$tk_strictMotif && [%W compare end != insert+1c]} {
+ %W delete insert
+ }
+}
+bind Text <Control-k> {
+ if {!$tk_strictMotif && [%W compare end != insert+1c]} {
+ if {[%W compare insert == {insert lineend}]} {
+ %W delete insert
+ } else {
+ %W delete insert {insert lineend}
+ }
+ }
+}
+bind Text <Control-o> {
+ if {!$tk_strictMotif} {
+ %W insert insert \n
+ %W mark set insert insert-1c
+ }
+}
+bind Text <Control-t> {
+ if {!$tk_strictMotif} {
+ tk::TextTranspose %W
+ }
+}
+
+bind Text <<Undo>> {
+ # An Undo operation may remove the separator at the top of the Undo stack.
+ # Then the item at the top of the stack gets merged with the subsequent changes.
+ # Place separators before and after Undo to prevent this.
+ if {[%W cget -autoseparators]} {
+ %W edit separator
+ }
+ catch { %W edit undo }
+ if {[%W cget -autoseparators]} {
+ %W edit separator
+ }
+}
+
+bind Text <<Redo>> {
+ catch { %W edit redo }
+}
+
+bind Text <Meta-b> {
+ if {!$tk_strictMotif} {
+ tk::TextSetCursor %W [tk::TextPrevPos %W insert tcl_startOfPreviousWord]
+ }
+}
+bind Text <Meta-d> {
+ if {!$tk_strictMotif && [%W compare end != insert+1c]} {
+ %W delete insert [tk::TextNextWord %W insert]
+ }
+}
+bind Text <Meta-f> {
+ if {!$tk_strictMotif} {
+ tk::TextSetCursor %W [tk::TextNextWord %W insert]
+ }
+}
+bind Text <Meta-less> {
+ if {!$tk_strictMotif} {
+ tk::TextSetCursor %W 1.0
+ }
+}
+bind Text <Meta-greater> {
+ if {!$tk_strictMotif} {
+ tk::TextSetCursor %W end-1c
+ }
+}
+bind Text <Meta-BackSpace> {
+ if {!$tk_strictMotif} {
+ %W delete [tk::TextPrevPos %W insert tcl_startOfPreviousWord] insert
+ }
+}
+bind Text <Meta-Delete> {
+ if {!$tk_strictMotif} {
+ %W delete [tk::TextPrevPos %W insert tcl_startOfPreviousWord] insert
+ }
+}
+
+# Macintosh only bindings:
+
+if {[tk windowingsystem] eq "aqua"} {
+bind Text <Control-v> {
+ tk::TextScrollPages %W 1
+}
+
+# End of Mac only bindings
+}
+
+# A few additional bindings of my own.
+
+bind Text <Control-h> {
+ if {!$tk_strictMotif && [%W compare insert != 1.0]} {
+ %W delete insert-1c
+ %W see insert
+ }
+}
+bind Text <2> {
+ if {!$tk_strictMotif} {
+ tk::TextScanMark %W %x %y
+ }
+}
+bind Text <B2-Motion> {
+ if {!$tk_strictMotif} {
+ tk::TextScanDrag %W %x %y
+ }
+}
+set ::tk::Priv(prevPos) {}
+
+# The MouseWheel will typically only fire on Windows and MacOS X.
+# However, someone could use the "event generate" command to produce one
+# on other platforms. We must be careful not to round -ve values of %D
+# down to zero.
+
+if {[tk windowingsystem] eq "aqua"} {
+ bind Text <MouseWheel> {
+ %W yview scroll [expr {-15 * (%D)}] pixels
+ }
+ bind Text <Option-MouseWheel> {
+ %W yview scroll [expr {-150 * (%D)}] pixels
+ }
+ bind Text <Shift-MouseWheel> {
+ %W xview scroll [expr {-15 * (%D)}] pixels
+ }
+ bind Text <Shift-Option-MouseWheel> {
+ %W xview scroll [expr {-150 * (%D)}] pixels
+ }
+} else {
+ # We must make sure that positive and negative movements are rounded
+ # equally to integers, avoiding the problem that
+ # (int)1/3 = 0,
+ # but
+ # (int)-1/3 = -1
+ # The following code ensure equal +/- behaviour.
+ bind Text <MouseWheel> {
+ if {%D >= 0} {
+ %W yview scroll [expr {-%D/3}] pixels
+ } else {
+ %W yview scroll [expr {(2-%D)/3}] pixels
+ }
+ }
+ bind Text <Shift-MouseWheel> {
+ if {%D >= 0} {
+ %W xview scroll [expr {-%D/3}] pixels
+ } else {
+ %W xview scroll [expr {(2-%D)/3}] pixels
+ }
+ }
+}
+
+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://linuxreviews.org/howtos/xfree/mouse/
+ bind Text <4> {
+ if {!$tk_strictMotif} {
+ %W yview scroll -50 pixels
+ }
+ }
+ bind Text <5> {
+ if {!$tk_strictMotif} {
+ %W yview scroll 50 pixels
+ }
+ }
+ bind Text <Shift-4> {
+ if {!$tk_strictMotif} {
+ %W xview scroll -50 pixels
+ }
+ }
+ bind Text <Shift-5> {
+ if {!$tk_strictMotif} {
+ %W xview scroll 50 pixels
+ }
+ }
+}
+
+# ::tk::TextClosestGap --
+# 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 ::tk::TextClosestGap {w x y} {
+ set pos [$w index @$x,$y]
+ set bbox [$w bbox $pos]
+ if {$bbox eq ""} {
+ return $pos
+ }
+ if {($x - [lindex $bbox 0]) < ([lindex $bbox 2]/2)} {
+ return $pos
+ }
+ $w index "$pos + 1 char"
+}
+
+# ::tk::TextButton1 --
+# 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 ::tk::TextButton1 {w x y} {
+ variable ::tk::Priv
+
+ set Priv(selectMode) char
+ set Priv(mouseMoved) 0
+ set Priv(pressX) $x
+ set anchorname [tk::TextAnchor $w]
+ $w mark set insert [TextClosestGap $w $x $y]
+ $w mark set $anchorname insert
+ # Set the anchor mark's gravity depending on the click position
+ # relative to the gap
+ set bbox [$w bbox [$w index $anchorname]]
+ if {$x > [lindex $bbox 0]} {
+ $w mark gravity $anchorname right
+ } else {
+ $w mark gravity $anchorname left
+ }
+ # Allow focus in any case on Windows, because that will let the
+ # selection be displayed even for state disabled text widgets.
+ if {[tk windowingsystem] eq "win32" \
+ || [$w cget -state] eq "normal"} {
+ focus $w
+ }
+ if {[$w cget -autoseparators]} {
+ $w edit separator
+ }
+}
+
+# ::tk::TextSelectTo --
+# This procedure is invoked to extend the selection, typically when
+# dragging it with the mouse. Depending on the selection mode (character,
+# word, line) it selects in different-sized units. This procedure
+# ignores mouse motions initially until the mouse has moved from
+# one character to another or until there have been multiple clicks.
+#
+# Note that the 'anchor' is implemented programmatically using
+# a text widget mark, and uses a name that will be unique for each
+# text widget (even when there are multiple peers). Currently the
+# anchor is considered private to Tk, hence the name 'tk::anchor$w'.
+#
+# Arguments:
+# w - The text window in which the button was pressed.
+# x - Mouse x position.
+# y - Mouse y position.
+
+set ::tk::Priv(textanchoruid) 0
+
+proc ::tk::TextAnchor {w} {
+ variable Priv
+ if {![info exists Priv(textanchor,$w)]} {
+ set Priv(textanchor,$w) tk::anchor[incr Priv(textanchoruid)]
+ }
+ return $Priv(textanchor,$w)
+}
+
+proc ::tk::TextSelectTo {w x y {extend 0}} {
+ variable ::tk::Priv
+
+ set anchorname [tk::TextAnchor $w]
+ set cur [TextClosestGap $w $x $y]
+ if {[catch {$w index $anchorname}]} {
+ $w mark set $anchorname $cur
+ }
+ set anchor [$w index $anchorname]
+ if {[$w compare $cur != $anchor] || (abs($Priv(pressX) - $x) >= 3)} {
+ set Priv(mouseMoved) 1
+ }
+ switch -- $Priv(selectMode) {
+ char {
+ if {[$w compare $cur < $anchorname]} {
+ set first $cur
+ set last $anchorname
+ } else {
+ set first $anchorname
+ set last $cur
+ }
+ }
+ word {
+ # Set initial range based only on the anchor (1 char min width)
+ if {[$w mark gravity $anchorname] eq "right"} {
+ set first $anchorname
+ set last "$anchorname + 1c"
+ } else {
+ set first "$anchorname - 1c"
+ set last $anchorname
+ }
+ # Extend range (if necessary) based on the current point
+ if {[$w compare $cur < $first]} {
+ set first $cur
+ } elseif {[$w compare $cur > $last]} {
+ set last $cur
+ }
+
+ # Now find word boundaries
+ set first [TextPrevPos $w "$first + 1c" tcl_wordBreakBefore]
+ set last [TextNextPos $w "$last - 1c" tcl_wordBreakAfter]
+ }
+ line {
+ # Set initial range based only on the anchor
+ set first "$anchorname linestart"
+ set last "$anchorname lineend"
+
+ # Extend range (if necessary) based on the current point
+ if {[$w compare $cur < $first]} {
+ set first "$cur linestart"
+ } elseif {[$w compare $cur > $last]} {
+ set last "$cur lineend"
+ }
+ set first [$w index $first]
+ set last [$w index "$last + 1c"]
+ }
+ }
+ if {$Priv(mouseMoved) || ($Priv(selectMode) ne "char")} {
+ $w tag remove sel 0.0 end
+ $w mark set insert $cur
+ $w tag add sel $first $last
+ $w tag remove sel $last end
+ update idletasks
+ }
+}
+
+# ::tk::TextKeyExtend --
+# 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 ::tk::TextKeyExtend {w index} {
+
+ set anchorname [tk::TextAnchor $w]
+ set cur [$w index $index]
+ if {[catch {$w index $anchorname}]} {
+ $w mark set $anchorname $cur
+ }
+ set anchor [$w index $anchorname]
+ if {[$w compare $cur < $anchorname]} {
+ set first $cur
+ set last $anchorname
+ } else {
+ set first $anchorname
+ set last $cur
+ }
+ $w tag remove sel 0.0 $first
+ $w tag add sel $first $last
+ $w tag remove sel $last end
+}
+
+# ::tk::TextPasteSelection --
+# 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 ::tk::TextPasteSelection {w x y} {
+ $w mark set insert [TextClosestGap $w $x $y]
+ if {![catch {::tk::GetSelection $w PRIMARY} sel]} {
+ set oldSeparator [$w cget -autoseparators]
+ if {$oldSeparator} {
+ $w configure -autoseparators 0
+ $w edit separator
+ }
+ $w insert insert $sel
+ if {$oldSeparator} {
+ $w edit separator
+ $w configure -autoseparators 1
+ }
+ }
+ if {[$w cget -state] eq "normal"} {
+ focus $w
+ }
+}
+
+# ::tk::TextAutoScan --
+# 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
+# ::tk::Priv(x) and ::tk::Priv(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 ::tk::TextAutoScan {w} {
+ variable ::tk::Priv
+ if {![winfo exists $w]} {
+ return
+ }
+ if {$Priv(y) >= [winfo height $w]} {
+ $w yview scroll [expr {1 + $Priv(y) - [winfo height $w]}] pixels
+ } elseif {$Priv(y) < 0} {
+ $w yview scroll [expr {-1 + $Priv(y)}] pixels
+ } elseif {$Priv(x) >= [winfo width $w]} {
+ $w xview scroll 2 units
+ } elseif {$Priv(x) < 0} {
+ $w xview scroll -2 units
+ } else {
+ return
+ }
+ TextSelectTo $w $Priv(x) $Priv(y)
+ set Priv(afterId) [after 50 [list tk::TextAutoScan $w]]
+}
+
+# ::tk::TextSetCursor
+# Move the insertion cursor to a given position in a text. Also
+# clears the selection, if there is one in the text, and makes sure
+# that the insertion cursor is visible. Also, don't let the insertion
+# cursor appear on the dummy last line of the text.
+#
+# Arguments:
+# w - The text window.
+# pos - The desired new position for the cursor in the window.
+
+proc ::tk::TextSetCursor {w pos} {
+ if {[$w compare $pos == end]} {
+ set pos {end - 1 chars}
+ }
+ $w mark set insert $pos
+ $w tag remove sel 1.0 end
+ $w see insert
+ if {[$w cget -autoseparators]} {
+ $w edit separator
+ }
+}
+
+# ::tk::TextKeySelect
+# 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 ::tk::TextKeySelect {w new} {
+ set anchorname [tk::TextAnchor $w]
+ if {[$w tag nextrange sel 1.0 end] eq ""} {
+ if {[$w compare $new < insert]} {
+ $w tag add sel $new insert
+ } else {
+ $w tag add sel insert $new
+ }
+ $w mark set $anchorname insert
+ } else {
+ if {[catch {$w index $anchorname}]} {
+ $w mark set $anchorname insert
+ }
+ if {[$w compare $new < $anchorname]} {
+ set first $new
+ set last $anchorname
+ } else {
+ set first $anchorname
+ 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
+ $w see insert
+ update idletasks
+}
+
+# ::tk::TextResetAnchor --
+# Set the selection anchor to whichever end is farthest from the
+# index argument. One special trick: if the selection has two or
+# fewer characters, just leave the anchor where it is. In this
+# case it doesn't matter which point gets chosen for the anchor,
+# and for the things like Shift-Left and Shift-Right this produces
+# better behavior when the cursor moves back and forth across the
+# anchor.
+#
+# Arguments:
+# w - The text widget.
+# index - Position at which mouse button was pressed, which determines
+# which end of selection should be used as anchor point.
+
+proc ::tk::TextResetAnchor {w index} {
+ if {[$w tag ranges sel] eq ""} {
+ # 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 anchorname [tk::TextAnchor $w]
+ set a [$w index $index]
+ set b [$w index sel.first]
+ set c [$w index sel.last]
+ if {[$w compare $a < $b]} {
+ $w mark set $anchorname sel.last
+ return
+ }
+ if {[$w compare $a > $c]} {
+ $w mark set $anchorname 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 $anchorname sel.last
+ } else {
+ $w mark set $anchorname sel.first
+ }
+ return
+ }
+ if {($lineA-$lineB) < ($lineC-$lineA)} {
+ $w mark set $anchorname sel.last
+ } else {
+ $w mark set $anchorname sel.first
+ }
+}
+
+# ::tk::TextCursorInSelection --
+# Check whether the selection exists and contains the insertion cursor. Note
+# that it assumes that the selection is contiguous.
+#
+# Arguments:
+# w - The text widget whose selection is to be checked
+
+proc ::tk::TextCursorInSelection {w} {
+ expr {
+ [llength [$w tag ranges sel]]
+ && [$w compare sel.first <= insert]
+ && [$w compare sel.last >= insert]
+ }
+}
+
+# ::tk::TextInsert --
+# 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 ::tk::TextInsert {w s} {
+ if {$s eq "" || [$w cget -state] eq "disabled"} {
+ return
+ }
+ set compound 0
+ if {[TextCursorInSelection $w]} {
+ set oldSeparator [$w cget -autoseparators]
+ if {$oldSeparator} {
+ $w configure -autoseparators 0
+ $w edit separator
+ set compound 1
+ }
+ $w delete sel.first sel.last
+ }
+ $w insert insert $s
+ $w see insert
+ if {$compound && $oldSeparator} {
+ $w edit separator
+ $w configure -autoseparators 1
+ }
+}
+
+# ::tk::TextUpDownLine --
+# Returns the index of the character one display line above or below the
+# insertion cursor. There are two tricky things here. First, we want to
+# maintain the original x position across repeated operations, even though
+# some lines that will get passed through don't have enough characters to
+# cover the original column. Second, don't try to scroll past the
+# beginning or end of the text.
+#
+# Arguments:
+# w - The text window in which the cursor is to move.
+# n - The number of display lines to move: -1 for up one line,
+# +1 for down one line.
+
+proc ::tk::TextUpDownLine {w n} {
+ variable ::tk::Priv
+
+ set i [$w index insert]
+ if {$Priv(prevPos) ne $i} {
+ set Priv(textPosOrig) $i
+ }
+ set lines [$w count -displaylines $Priv(textPosOrig) $i]
+ set new [$w index \
+ "$Priv(textPosOrig) + [expr {$lines + $n}] displaylines"]
+ if {[$w compare $new == end] \
+ || [$w compare $new == "insert display linestart"]} {
+ set new $i
+ }
+ set Priv(prevPos) $new
+ return $new
+}
+
+# ::tk::TextPrevPara --
+# Returns the index of the beginning of the paragraph just before a given
+# position in the text (the beginning of a paragraph is the first non-blank
+# character after a blank line).
+#
+# Arguments:
+# w - The text window in which the cursor is to move.
+# pos - Position at which to start search.
+
+proc ::tk::TextPrevPara {w pos} {
+ set pos [$w index "$pos linestart"]
+ while {1} {
+ if {([$w get "$pos - 1 line"] eq "\n" && ([$w get $pos] ne "\n")) \
+ || $pos eq "1.0"} {
+ if {[regexp -indices -- {^[ \t]+(.)} \
+ [$w get $pos "$pos lineend"] -> index]} {
+ set pos [$w index "$pos + [lindex $index 0] chars"]
+ }
+ if {[$w compare $pos != insert] || [lindex [split $pos .] 0]==1} {
+ return $pos
+ }
+ }
+ set pos [$w index "$pos - 1 line"]
+ }
+}
+
+# ::tk::TextNextPara --
+# Returns the index of the beginning of the paragraph just after a given
+# position in the text (the beginning of a paragraph is the first non-blank
+# character after a blank line).
+#
+# Arguments:
+# w - The text window in which the cursor is to move.
+# start - Position at which to start search.
+
+proc ::tk::TextNextPara {w start} {
+ set pos [$w index "$start linestart + 1 line"]
+ while {[$w get $pos] ne "\n"} {
+ if {[$w compare $pos == end]} {
+ return [$w index "end - 1c"]
+ }
+ set pos [$w index "$pos + 1 line"]
+ }
+ while {[$w get $pos] eq "\n"} {
+ set pos [$w index "$pos + 1 line"]
+ if {[$w compare $pos == end]} {
+ return [$w index "end - 1c"]
+ }
+ }
+ if {[regexp -indices -- {^[ \t]+(.)} \
+ [$w get $pos "$pos lineend"] -> index]} {
+ return [$w index "$pos + [lindex $index 0] chars"]
+ }
+ return $pos
+}
+
+# ::tk::TextScrollPages --
+# This is a utility procedure used in bindings for moving up and down
+# pages and possibly extending the selection along the way. It scrolls
+# the view in the widget by the number of pages, and it returns the
+# index of the character that is at the same position in the new view
+# as the insertion cursor used to be in the old view.
+#
+# Arguments:
+# w - The text window in which the cursor is to move.
+# count - Number of pages forward to scroll; may be negative
+# to scroll backwards.
+
+proc ::tk::TextScrollPages {w count} {
+ set bbox [$w bbox insert]
+ $w yview scroll $count pages
+ if {$bbox eq ""} {
+ return [$w index @[expr {[winfo height $w]/2}],0]
+ }
+ return [$w index @[lindex $bbox 0],[lindex $bbox 1]]
+}
+
+# ::tk::TextTranspose --
+# This procedure implements the "transpose" function for text widgets.
+# It tranposes the characters on either side of the insertion cursor,
+# unless the cursor is at the end of the line. In this case it
+# transposes the two characters to the left of the cursor. In either
+# case, the cursor ends up to the right of the transposed characters.
+#
+# Arguments:
+# w - Text window in which to transpose.
+
+proc ::tk::TextTranspose w {
+ set pos insert
+ if {[$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
+ }
+ # ensure this is seen as an atomic op to undo
+ set autosep [$w cget -autoseparators]
+ if {$autosep} {
+ $w configure -autoseparators 0
+ $w edit separator
+ }
+ $w delete "$pos - 2 char" $pos
+ $w insert insert $new
+ $w see insert
+ if {$autosep} {
+ $w edit separator
+ $w configure -autoseparators $autosep
+ }
+}
+
+# ::tk_textCopy --
+# This procedure copies the selection from a text widget into the
+# clipboard.
+#
+# Arguments:
+# w - Name of a text widget.
+
+proc ::tk_textCopy w {
+ if {![catch {set data [$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]}]} {
+ # make <<Cut>> an atomic operation on the Undo stack,
+ # i.e. separate it from other delete operations on either side
+ set oldSeparator [$w cget -autoseparators]
+ if {([$w cget -state] eq "normal") && $oldSeparator} {
+ $w edit separator
+ }
+ clipboard clear -displayof $w
+ clipboard append -displayof $w $data
+ $w delete sel.first sel.last
+ if {([$w cget -state] eq "normal") && $oldSeparator} {
+ $w edit separator
+ }
+ }
+}
+
+# ::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 {
+ if {![catch {::tk::GetSelection $w CLIPBOARD} sel]} {
+ set oldSeparator [$w cget -autoseparators]
+ if {$oldSeparator} {
+ $w configure -autoseparators 0
+ $w edit separator
+ }
+ if {[tk windowingsystem] ne "x11"} {
+ catch { $w delete sel.first sel.last }
+ }
+ $w insert insert $sel
+ if {$oldSeparator} {
+ $w edit separator
+ $w configure -autoseparators 1
+ }
+ }
+}
+
+# ::tk::TextNextWord --
+# 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 {[tk windowingsystem] eq "win32"} {
+ proc ::tk::TextNextWord {w start} {
+ TextNextPos $w [TextNextPos $w $start tcl_endOfWord] \
+ tcl_startOfNextWord
+ }
+} else {
+ proc ::tk::TextNextWord {w start} {
+ TextNextPos $w $start tcl_endOfWord
+ }
+}
+
+# ::tk::TextNextPos --
+# 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 ::tk::TextNextPos {w start op} {
+ set text ""
+ set cur $start
+ while {[$w compare $cur < end]} {
+ set text $text[$w get -displaychars $cur "$cur lineend + 1c"]
+ set pos [$op $text 0]
+ if {$pos >= 0} {
+ return [$w index "$start + $pos display chars"]
+ }
+ set cur [$w index "$cur lineend +1c"]
+ }
+ return end
+}
+
+# ::tk::TextPrevPos --
+# 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 ::tk::TextPrevPos {w start op} {
+ set text ""
+ set cur $start
+ while {[$w compare $cur > 0.0]} {
+ set text [$w get -displaychars "$cur linestart - 1c" $cur]$text
+ set pos [$op $text end]
+ if {$pos >= 0} {
+ return [$w index "$cur linestart - 1c + $pos display chars"]
+ }
+ set cur [$w index "$cur linestart - 1c"]
+ }
+ return 0.0
+}
+
+# ::tk::TextScanMark --
+#
+# Marks the start of a possible scan drag operation
+#
+# Arguments:
+# w - The text window from which the text to get
+# x - x location on screen
+# y - y location on screen
+
+proc ::tk::TextScanMark {w x y} {
+ variable ::tk::Priv
+ $w scan mark $x $y
+ set Priv(x) $x
+ set Priv(y) $y
+ set Priv(mouseMoved) 0
+}
+
+# ::tk::TextScanDrag --
+#
+# Marks the start of a possible scan drag operation
+#
+# Arguments:
+# w - The text window from which the text to get
+# x - x location on screen
+# y - y location on screen
+
+proc ::tk::TextScanDrag {w x y} {
+ variable ::tk::Priv
+ # Make sure these exist, as some weird situations can trigger the
+ # motion binding without the initial press. [Bug #220269]
+ if {![info exists Priv(x)]} {
+ set Priv(x) $x
+ }
+ if {![info exists Priv(y)]} {
+ set Priv(y) $y
+ }
+ if {($x != $Priv(x)) || ($y != $Priv(y))} {
+ set Priv(mouseMoved) 1
+ }
+ if {[info exists Priv(mouseMoved)] && $Priv(mouseMoved)} {
+ $w scan dragto $x $y
+ }
+}
+
generated by cgit v0.12 at 2024-11-18 21:03:31 (GMT)