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+# entry.tcl --
+#
+# This file defines the default bindings for Tk entry widgets and provides
+# procedures that help in implementing those bindings.
+#
+# SCCS: @(#) entry.tcl 1.49 97/09/17 19:08:48
+#
+# Copyright (c) 1992-1994 The Regents of the University of California.
+# Copyright (c) 1994-1997 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.
+# mouseMoved - Non-zero means the mouse has moved a significant
+# amount since the button went down (so, for example,
+# start dragging out a selection).
+# pressX - X-coordinate at which the mouse button was pressed.
+# 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.
+#-------------------------------------------------------------------------
+
+bind Entry <<Cut>> {
+ if {![catch {set data [string range [%W get] [%W index sel.first]\
+ [expr [%W index sel.last] - 1]]}]} {
+ clipboard clear -displayof %W
+ clipboard append -displayof %W $data
+ %W delete sel.first sel.last
+ }
+}
+bind Entry <<Copy>> {
+ if {![catch {set data [string range [%W get] [%W index sel.first]\
+ [expr [%W index sel.last] - 1]]}]} {
+ clipboard clear -displayof %W
+ clipboard append -displayof %W $data
+ }
+}
+bind Entry <<Paste>> {
+ global tcl_platform
+ catch {
+ if {"$tcl_platform(platform)" != "unix"} {
+ catch {
+ %W delete sel.first sel.last
+ }
+ }
+ %W insert insert [selection get -displayof %W -selection CLIPBOARD]
+ tkEntrySeeInsert %W
+ }
+}
+bind Entry <<Clear>> {
+ %W delete sel.first sel.last
+}
+
+# Standard Motif bindings:
+
+bind Entry <1> {
+ tkEntryButton1 %W %x
+ %W selection clear
+}
+bind Entry <B1-Motion> {
+ set tkPriv(x) %x
+ tkEntryMouseSelect %W %x
+}
+bind Entry <Double-1> {
+ set tkPriv(selectMode) word
+ tkEntryMouseSelect %W %x
+ catch {%W icursor sel.first}
+}
+bind Entry <Triple-1> {
+ set tkPriv(selectMode) line
+ tkEntryMouseSelect %W %x
+ %W icursor 0
+}
+bind Entry <Shift-1> {
+ set tkPriv(selectMode) char
+ %W selection adjust @%x
+}
+bind Entry <Double-Shift-1> {
+ set tkPriv(selectMode) word
+ tkEntryMouseSelect %W %x
+}
+bind Entry <Triple-Shift-1> {
+ set tkPriv(selectMode) line
+ tkEntryMouseSelect %W %x
+}
+bind Entry <B1-Leave> {
+ set tkPriv(x) %x
+ tkEntryAutoScan %W
+}
+bind Entry <B1-Enter> {
+ tkCancelRepeat
+}
+bind Entry <ButtonRelease-1> {
+ tkCancelRepeat
+}
+bind Entry <Control-1> {
+ %W icursor @%x
+}
+bind Entry <ButtonRelease-2> {
+ if {!$tkPriv(mouseMoved) || $tk_strictMotif} {
+ tkEntryPaste %W %x
+ }
+}
+
+bind Entry <Left> {
+ tkEntrySetCursor %W [expr [%W index insert] - 1]
+}
+bind Entry <Right> {
+ tkEntrySetCursor %W [expr [%W index insert] + 1]
+}
+bind Entry <Shift-Left> {
+ tkEntryKeySelect %W [expr [%W index insert] - 1]
+ tkEntrySeeInsert %W
+}
+bind Entry <Shift-Right> {
+ tkEntryKeySelect %W [expr [%W index insert] + 1]
+ tkEntrySeeInsert %W
+}
+bind Entry <Control-Left> {
+ tkEntrySetCursor %W [tkEntryPreviousWord %W insert]
+}
+bind Entry <Control-Right> {
+ tkEntrySetCursor %W [tkEntryNextWord %W insert]
+}
+bind Entry <Shift-Control-Left> {
+ tkEntryKeySelect %W [tkEntryPreviousWord %W insert]
+ tkEntrySeeInsert %W
+}
+bind Entry <Shift-Control-Right> {
+ tkEntryKeySelect %W [tkEntryNextWord %W insert]
+ tkEntrySeeInsert %W
+}
+bind Entry <Home> {
+ tkEntrySetCursor %W 0
+}
+bind Entry <Shift-Home> {
+ tkEntryKeySelect %W 0
+ tkEntrySeeInsert %W
+}
+bind Entry <End> {
+ tkEntrySetCursor %W end
+}
+bind Entry <Shift-End> {
+ tkEntryKeySelect %W end
+ tkEntrySeeInsert %W
+}
+
+bind Entry <Delete> {
+ if [%W selection present] {
+ %W delete sel.first sel.last
+ } else {
+ %W delete insert
+ }
+}
+bind Entry <BackSpace> {
+ tkEntryBackspace %W
+}
+
+bind Entry <Control-space> {
+ %W selection from insert
+}
+bind Entry <Select> {
+ %W selection from insert
+}
+bind Entry <Control-Shift-space> {
+ %W selection adjust insert
+}
+bind Entry <Shift-Select> {
+ %W selection adjust insert
+}
+bind Entry <Control-slash> {
+ %W selection range 0 end
+}
+bind Entry <Control-backslash> {
+ %W selection clear
+}
+bind Entry <KeyPress> {
+ tkEntryInsert %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, Return, and Tab.
+
+bind Entry <Alt-KeyPress> {# nothing}
+bind Entry <Meta-KeyPress> {# nothing}
+bind Entry <Control-KeyPress> {# nothing}
+bind Entry <Escape> {# nothing}
+bind Entry <Return> {# nothing}
+bind Entry <KP_Enter> {# nothing}
+bind Entry <Tab> {# nothing}
+if {$tcl_platform(platform) == "macintosh"} {
+ bind Entry <Command-KeyPress> {# nothing}
+}
+
+bind Entry <Insert> {
+ catch {tkEntryInsert %W [selection get -displayof %W]}
+}
+
+# Additional emacs-like bindings:
+
+bind Entry <Control-a> {
+ if !$tk_strictMotif {
+ tkEntrySetCursor %W 0
+ }
+}
+bind Entry <Control-b> {
+ if !$tk_strictMotif {
+ tkEntrySetCursor %W [expr [%W index insert] - 1]
+ }
+}
+bind Entry <Control-d> {
+ if !$tk_strictMotif {
+ %W delete insert
+ }
+}
+bind Entry <Control-e> {
+ if !$tk_strictMotif {
+ tkEntrySetCursor %W end
+ }
+}
+bind Entry <Control-f> {
+ if !$tk_strictMotif {
+ tkEntrySetCursor %W [expr [%W index insert] + 1]
+ }
+}
+bind Entry <Control-h> {
+ if !$tk_strictMotif {
+ tkEntryBackspace %W
+ }
+}
+bind Entry <Control-k> {
+ if !$tk_strictMotif {
+ %W delete insert end
+ }
+}
+bind Entry <Control-t> {
+ if !$tk_strictMotif {
+ tkEntryTranspose %W
+ }
+}
+bind Entry <Meta-b> {
+ if !$tk_strictMotif {
+ tkEntrySetCursor %W [tkEntryPreviousWord %W insert]
+ }
+}
+bind Entry <Meta-d> {
+ if !$tk_strictMotif {
+ %W delete insert [tkEntryNextWord %W insert]
+ }
+}
+bind Entry <Meta-f> {
+ if !$tk_strictMotif {
+ tkEntrySetCursor %W [tkEntryNextWord %W insert]
+ }
+}
+bind Entry <Meta-BackSpace> {
+ if !$tk_strictMotif {
+ %W delete [tkEntryPreviousWord %W insert] insert
+ }
+}
+bind Entry <Meta-Delete> {
+ if !$tk_strictMotif {
+ %W delete [tkEntryPreviousWord %W insert] insert
+ }
+}
+
+# A few additional bindings of my own.
+
+bind Entry <2> {
+ if !$tk_strictMotif {
+ %W scan mark %x
+ set tkPriv(x) %x
+ set tkPriv(y) %y
+ set tkPriv(mouseMoved) 0
+ }
+}
+bind Entry <B2-Motion> {
+ if !$tk_strictMotif {
+ if {abs(%x-$tkPriv(x)) > 2} {
+ set tkPriv(mouseMoved) 1
+ }
+ %W scan dragto %x
+ }
+}
+
+# tkEntryClosestGap --
+# 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 entry window.
+# x - X-coordinate within the window.
+
+proc tkEntryClosestGap {w x} {
+ set pos [$w index @$x]
+ set bbox [$w bbox $pos]
+ if {($x - [lindex $bbox 0]) < ([lindex $bbox 2]/2)} {
+ return $pos
+ }
+ incr pos
+}
+
+# tkEntryButton1 --
+# This procedure is invoked to handle button-1 presses in entry
+# widgets. It moves the insertion cursor, sets the selection anchor,
+# and claims the input focus.
+#
+# Arguments:
+# w - The entry window in which the button was pressed.
+# x - The x-coordinate of the button press.
+
+proc tkEntryButton1 {w x} {
+ global tkPriv
+
+ set tkPriv(selectMode) char
+ set tkPriv(mouseMoved) 0
+ set tkPriv(pressX) $x
+ $w icursor [tkEntryClosestGap $w $x]
+ $w selection from insert
+ if {[lindex [$w configure -state] 4] == "normal"} {focus $w}
+}
+
+# tkEntryMouseSelect --
+# This procedure is invoked when dragging out a selection 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 entry window in which the button was pressed.
+# x - The x-coordinate of the mouse.
+
+proc tkEntryMouseSelect {w x} {
+ global tkPriv
+
+ set cur [tkEntryClosestGap $w $x]
+ set anchor [$w index anchor]
+ if {($cur != $anchor) || (abs($tkPriv(pressX) - $x) >= 3)} {
+ set tkPriv(mouseMoved) 1
+ }
+ switch $tkPriv(selectMode) {
+ char {
+ if $tkPriv(mouseMoved) {
+ if {$cur < $anchor} {
+ $w selection range $cur $anchor
+ } elseif {$cur > $anchor} {
+ $w selection range $anchor $cur
+ } else {
+ $w selection clear
+ }
+ }
+ }
+ word {
+ if {$cur < [$w index anchor]} {
+ set before [tcl_wordBreakBefore [$w get] $cur]
+ set after [tcl_wordBreakAfter [$w get] [expr $anchor-1]]
+ } else {
+ set before [tcl_wordBreakBefore [$w get] $anchor]
+ set after [tcl_wordBreakAfter [$w get] [expr $cur - 1]]
+ }
+ if {$before < 0} {
+ set before 0
+ }
+ if {$after < 0} {
+ set after end
+ }
+ $w selection range $before $after
+ }
+ line {
+ $w selection range 0 end
+ }
+ }
+ update idletasks
+}
+
+# tkEntryPaste --
+# This procedure sets the insertion cursor to the current mouse position,
+# pastes the selection there, and sets the focus to the window.
+#
+# Arguments:
+# w - The entry window.
+# x - X position of the mouse.
+
+proc tkEntryPaste {w x} {
+ global tkPriv
+
+ $w icursor [tkEntryClosestGap $w $x]
+ catch {$w insert insert [selection get -displayof $w]}
+ if {[lindex [$w configure -state] 4] == "normal"} {focus $w}
+}
+
+# tkEntryAutoScan --
+# This procedure is invoked when the mouse leaves an entry window
+# with button 1 down. It scrolls the window left or right,
+# depending on where the mouse is, and reschedules itself as an
+# "after" command so that the window continues to scroll until the
+# mouse moves back into the window or the mouse button is released.
+#
+# Arguments:
+# w - The entry window.
+
+proc tkEntryAutoScan {w} {
+ global tkPriv
+ set x $tkPriv(x)
+ if {![winfo exists $w]} return
+ if {$x >= [winfo width $w]} {
+ $w xview scroll 2 units
+ tkEntryMouseSelect $w $x
+ } elseif {$x < 0} {
+ $w xview scroll -2 units
+ tkEntryMouseSelect $w $x
+ }
+ set tkPriv(afterId) [after 50 tkEntryAutoScan $w]
+}
+
+# tkEntryKeySelect --
+# This procedure is invoked when stroking out selections using the
+# keyboard. It moves the cursor to a new position, then extends
+# the selection to that position.
+#
+# Arguments:
+# w - The entry window.
+# new - A new position for the insertion cursor (the cursor hasn't
+# actually been moved to this position yet).
+
+proc tkEntryKeySelect {w new} {
+ if ![$w selection present] {
+ $w selection from insert
+ $w selection to $new
+ } else {
+ $w selection adjust $new
+ }
+ $w icursor $new
+}
+
+# tkEntryInsert --
+# Insert a string into an entry at the point of the insertion cursor.
+# If there is a selection in the entry, and it covers the point of the
+# insertion cursor, then delete the selection before inserting.
+#
+# Arguments:
+# w - The entry window in which to insert the string
+# s - The string to insert (usually just a single character)
+
+proc tkEntryInsert {w s} {
+ if {$s == ""} {
+ return
+ }
+ catch {
+ set insert [$w index insert]
+ if {([$w index sel.first] <= $insert)
+ && ([$w index sel.last] >= $insert)} {
+ $w delete sel.first sel.last
+ }
+ }
+ $w insert insert $s
+ tkEntrySeeInsert $w
+}
+
+# tkEntryBackspace --
+# Backspace over the character just before the insertion cursor.
+# If backspacing would move the cursor off the left edge of the
+# window, reposition the cursor at about the middle of the window.
+#
+# Arguments:
+# w - The entry window in which to backspace.
+
+proc tkEntryBackspace w {
+ if [$w selection present] {
+ $w delete sel.first sel.last
+ } else {
+ set x [expr {[$w index insert] - 1}]
+ if {$x >= 0} {$w delete $x}
+ if {[$w index @0] >= [$w index insert]} {
+ set range [$w xview]
+ set left [lindex $range 0]
+ set right [lindex $range 1]
+ $w xview moveto [expr $left - ($right - $left)/2.0]
+ }
+ }
+}
+
+# tkEntrySeeInsert --
+# Make sure that the insertion cursor is visible in the entry window.
+# If not, adjust the view so that it is.
+#
+# Arguments:
+# w - The entry window.
+
+proc tkEntrySeeInsert w {
+ set c [$w index insert]
+ set left [$w index @0]
+ if {$left > $c} {
+ $w xview $c
+ return
+ }
+ set x [winfo width $w]
+ while {([$w index @$x] <= $c) && ($left < $c)} {
+ incr left
+ $w xview $left
+ }
+}
+
+# tkEntrySetCursor -
+# Move the insertion cursor to a given position in an entry. Also
+# clears the selection, if there is one in the entry, and makes sure
+# that the insertion cursor is visible.
+#
+# Arguments:
+# w - The entry window.
+# pos - The desired new position for the cursor in the window.
+
+proc tkEntrySetCursor {w pos} {
+ $w icursor $pos
+ $w selection clear
+ tkEntrySeeInsert $w
+}
+
+# tkEntryTranspose -
+# This procedure implements the "transpose" function for entry widgets.
+# It tranposes the characters on either side of the insertion cursor,
+# unless the cursor is at the end of the line. In this case it
+# transposes the two characters to the left of the cursor. In either
+# case, the cursor ends up to the right of the transposed characters.
+#
+# Arguments:
+# w - The entry window.
+
+proc tkEntryTranspose w {
+ set i [$w index insert]
+ if {$i < [$w index end]} {
+ incr i
+ }
+ set first [expr $i-2]
+ if {$first < 0} {
+ return
+ }
+ set new [string index [$w get] [expr $i-1]][string index [$w get] $first]
+ $w delete $first $i
+ $w insert insert $new
+ tkEntrySeeInsert $w
+}
+
+# tkEntryNextWord --
+# Returns the index of the next word position after a given position in the
+# entry. The next word is platform dependent and may be either the next
+# end-of-word position or the next start-of-word position after the next
+# end-of-word position.
+#
+# Arguments:
+# w - The entry window in which the cursor is to move.
+# start - Position at which to start search.
+
+if {$tcl_platform(platform) == "windows"} {
+ proc tkEntryNextWord {w start} {
+ set pos [tcl_endOfWord [$w get] [$w index $start]]
+ if {$pos >= 0} {
+ set pos [tcl_startOfNextWord [$w get] $pos]
+ }
+ if {$pos < 0} {
+ return end
+ }
+ return $pos
+ }
+} else {
+ proc tkEntryNextWord {w start} {
+ set pos [tcl_endOfWord [$w get] [$w index $start]]
+ if {$pos < 0} {
+ return end
+ }
+ return $pos
+ }
+}
+
+# tkEntryPreviousWord --
+#
+# Returns the index of the previous word position before a given
+# position in the entry.
+#
+# Arguments:
+# w - The entry window in which the cursor is to move.
+# start - Position at which to start search.
+
+proc tkEntryPreviousWord {w start} {
+ set pos [tcl_startOfPreviousWord [$w get] [$w index $start]]
+ if {$pos < 0} {
+ return 0
+ }
+ return $pos
+}
+
generated by cgit v0.12 at 2024-07-16 14:51:29 (GMT)