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#
# $Id: entry.tcl,v 1.4 2007/12/13 15:27:08 dgp Exp $
#
# DERIVED FROM: tk/library/entry.tcl r1.22
#
# Copyright (c) 1992-1994 The Regents of the University of California.
# Copyright (c) 1994-1997 Sun Microsystems, Inc.
# Copyright (c) 2004, Joe English
#
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
#
namespace eval ttk {
namespace eval entry {
variable State
set State(x) 0
set State(selectMode) char
set State(anchor) 0
set State(scanX) 0
set State(scanIndex) 0
set State(scanMoved) 0
# Button-2 scan speed is (scanNum/scanDen) characters
# per pixel of mouse movement.
# The standard Tk entry widget uses the equivalent of
# scanNum = 10, scanDen = average character width.
# I don't know why that was chosen.
#
set State(scanNum) 1
set State(scanDen) 1
set State(deadband) 3 ;# #pixels for mouse-moved deadband.
}
}
### Bindings.
#
# Removed the following standard Tk bindings:
#
# <Control-Key-space>, <Control-Shift-Key-space>,
# <Key-Select>, <Shift-Key-Select>:
# Ttk entry widget doesn't use selection anchor.
# <Key-Insert>:
# Inserts PRIMARY selection (on non-Windows platforms).
# This is inconsistent with typical platform bindings.
# <Double-Shift-ButtonPress-1>, <Triple-Shift-ButtonPress-1>:
# These don't do the right thing to start with.
# <Meta-Key-b>, <Meta-Key-d>, <Meta-Key-f>,
# <Meta-Key-BackSpace>, <Meta-Key-Delete>:
# Judgment call. If <Meta> happens to be assigned to the Alt key,
# these could conflict with application accelerators.
# (Plus, who has a Meta key these days?)
# <Control-Key-t>:
# Another judgment call. If anyone misses this, let me know
# and I'll put it back.
#
## Clipboard events:
#
bind TEntry <<Cut>> { ttk::entry::Cut %W }
bind TEntry <<Copy>> { ttk::entry::Copy %W }
bind TEntry <<Paste>> { ttk::entry::Paste %W }
bind TEntry <<Clear>> { ttk::entry::Clear %W }
## Button1 bindings:
# Used for selection and navigation.
#
bind TEntry <ButtonPress-1> { ttk::entry::Press %W %x }
bind TEntry <Shift-ButtonPress-1> { ttk::entry::Shift-Press %W %x }
bind TEntry <Double-ButtonPress-1> { ttk::entry::Select %W %x word }
bind TEntry <Triple-ButtonPress-1> { ttk::entry::Select %W %x line }
bind TEntry <B1-Motion> { ttk::entry::Drag %W %x }
bind TEntry <B1-Leave> { ttk::Repeatedly ttk::entry::AutoScroll %W }
bind TEntry <B1-Enter> { ttk::CancelRepeat }
bind TEntry <ButtonRelease-1> { ttk::CancelRepeat }
bind TEntry <Control-ButtonPress-1> {
%W instate {!readonly !disabled} { %W icursor @%x ; focus %W }
}
## Button2 bindings:
# Used for scanning and primary transfer.
# Note: ButtonRelease-2 is mapped to <<PasteSelection>> in tk.tcl.
#
bind TEntry <ButtonPress-2> { ttk::entry::ScanMark %W %x }
bind TEntry <B2-Motion> { ttk::entry::ScanDrag %W %x }
bind TEntry <ButtonRelease-2> { ttk::entry::ScanRelease %W %x }
bind TEntry <<PasteSelection>> { ttk::entry::ScanRelease %W %x }
## Keyboard navigation bindings:
#
bind TEntry <Key-Left> { ttk::entry::Move %W prevchar }
bind TEntry <Key-Right> { ttk::entry::Move %W nextchar }
bind TEntry <Control-Key-Left> { ttk::entry::Move %W prevword }
bind TEntry <Control-Key-Right> { ttk::entry::Move %W nextword }
bind TEntry <Key-Home> { ttk::entry::Move %W home }
bind TEntry <Key-End> { ttk::entry::Move %W end }
bind TEntry <Shift-Key-Left> { ttk::entry::Extend %W prevchar }
bind TEntry <Shift-Key-Right> { ttk::entry::Extend %W nextchar }
bind TEntry <Shift-Control-Key-Left> { ttk::entry::Extend %W prevword }
bind TEntry <Shift-Control-Key-Right> { ttk::entry::Extend %W nextword }
bind TEntry <Shift-Key-Home> { ttk::entry::Extend %W home }
bind TEntry <Shift-Key-End> { ttk::entry::Extend %W end }
bind TEntry <Control-Key-slash> { %W selection range 0 end }
bind TEntry <Control-Key-backslash> { %W selection clear }
bind TEntry <<TraverseIn>> { %W selection range 0 end; %W icursor end }
## Edit bindings:
#
bind TEntry <KeyPress> { ttk::entry::Insert %W %A }
bind TEntry <Key-Delete> { ttk::entry::Delete %W }
bind TEntry <Key-BackSpace> { ttk::entry::Backspace %W }
# Ignore all Alt, Meta, and Control keypresses unless explicitly bound.
# Otherwise, the <KeyPress> class binding will fire and insert the character.
# Ditto for Escape, Return, and Tab.
#
bind TEntry <Alt-KeyPress> {# nothing}
bind TEntry <Meta-KeyPress> {# nothing}
bind TEntry <Control-KeyPress> {# nothing}
bind TEntry <Key-Escape> {# nothing}
bind TEntry <Key-Return> {# nothing}
bind TEntry <Key-KP_Enter> {# nothing}
bind TEntry <Key-Tab> {# nothing}
# Argh. Apparently on Windows, the NumLock modifier is interpreted
# as a Command modifier.
if {[tk windowingsystem] eq "aqua"} {
bind TEntry <Command-KeyPress> {# nothing}
}
## Additional emacs-like bindings:
#
bind TEntry <Control-Key-a> { ttk::entry::Move %W home }
bind TEntry <Control-Key-b> { ttk::entry::Move %W prevchar }
bind TEntry <Control-Key-d> { ttk::entry::Delete %W }
bind TEntry <Control-Key-e> { ttk::entry::Move %W end }
bind TEntry <Control-Key-f> { ttk::entry::Move %W nextchar }
bind TEntry <Control-Key-h> { ttk::entry::Backspace %W }
bind TEntry <Control-Key-k> { %W delete insert end }
### Clipboard procedures.
#
## EntrySelection -- Return the selected text of the entry.
# Raises an error if there is no selection.
#
proc ttk::entry::EntrySelection {w} {
set entryString [string range [$w get] [$w index sel.first] \
[expr {[$w index sel.last] - 1}]]
if {[$w cget -show] ne ""} {
return [string repeat [string index [$w cget -show] 0] \
[string length $entryString]]
}
return $entryString
}
## Paste -- Insert clipboard contents at current insert point.
#
proc ttk::entry::Paste {w} {
catch {
set clipboard [::tk::GetSelection $w CLIPBOARD]
PendingDelete $w
$w insert insert $clipboard
See $w insert
}
}
## Copy -- Copy selection to clipboard.
#
proc ttk::entry::Copy {w} {
if {![catch {EntrySelection $w} selection]} {
clipboard clear -displayof $w
clipboard append -displayof $w $selection
}
}
## Clear -- Delete the selection.
#
proc ttk::entry::Clear {w} {
catch { $w delete sel.first sel.last }
}
## Cut -- Copy selection to clipboard then delete it.
#
proc ttk::entry::Cut {w} {
Copy $w; Clear $w
}
### Navigation procedures.
#
## ClosestGap -- Find closest boundary between characters.
# Returns the index of the character just after the boundary.
#
proc ttk::entry::ClosestGap {w x} {
set pos [$w index @$x]
set bbox [$w bbox $pos]
if {$x - [lindex $bbox 0] > [lindex $bbox 2]/2} {
incr pos
}
return $pos
}
## See $index -- Make sure that the character at $index is visible.
#
proc ttk::entry::See {w {index insert}} {
update idletasks ;# ensure scroll data up-to-date
set c [$w index $index]
# @@@ OR: check [$w index left] / [$w index right]
if {$c < [$w index @0] || $c >= [$w index @[winfo width $w]]} {
$w xview $c
}
}
## NextWord -- Find the next word position.
# Note: The "next word position" follows platform conventions:
# either the next end-of-word position, or the start-of-word
# position following the next end-of-word position.
#
set ::ttk::entry::State(startNext) \
[string equal $tcl_platform(platform) "windows"]
proc ttk::entry::NextWord {w start} {
variable State
set pos [tcl_endOfWord [$w get] [$w index $start]]
if {$pos >= 0 && $State(startNext)} {
set pos [tcl_startOfNextWord [$w get] $pos]
}
if {$pos < 0} {
return end
}
return $pos
}
## PrevWord -- Find the previous word position.
#
proc ttk::entry::PrevWord {w start} {
set pos [tcl_startOfPreviousWord [$w get] [$w index $start]]
if {$pos < 0} {
return 0
}
return $pos
}
## RelIndex -- Compute character/word/line-relative index.
#
proc ttk::entry::RelIndex {w where {index insert}} {
switch -- $where {
prevchar { expr {[$w index $index] - 1} }
nextchar { expr {[$w index $index] + 1} }
prevword { PrevWord $w $index }
nextword { NextWord $w $index }
home { return 0 }
end { $w index end }
default { error "Bad relative index $index" }
}
}
## Move -- Move insert cursor to relative location.
# Also clears the selection, if any, and makes sure
# that the insert cursor is visible.
#
proc ttk::entry::Move {w where} {
$w icursor [RelIndex $w $where]
$w selection clear
See $w insert
}
### Selection procedures.
#
## ExtendTo -- Extend the selection to the specified index.
#
# The other end of the selection (the anchor) is determined as follows:
#
# (1) if there is no selection, the anchor is the insert cursor;
# (2) if the index is outside the selection, grow the selection;
# (3) if the insert cursor is at one end of the selection, anchor the other end
# (4) otherwise anchor the start of the selection
#
# The insert cursor is placed at the new end of the selection.
#
# Returns: selection anchor.
#
proc ttk::entry::ExtendTo {w index} {
set index [$w index $index]
set insert [$w index insert]
# Figure out selection anchor:
if {![$w selection present]} {
set anchor $insert
} else {
set selfirst [$w index sel.first]
set sellast [$w index sel.last]
if { ($index < $selfirst)
|| ($insert == $selfirst && $index <= $sellast)
} {
set anchor $sellast
} else {
set anchor $selfirst
}
}
# Extend selection:
if {$anchor < $index} {
$w selection range $anchor $index
} else {
$w selection range $index $anchor
}
$w icursor $index
return $anchor
}
## Extend -- Extend the selection to a relative position, show insert cursor
#
proc ttk::entry::Extend {w where} {
ExtendTo $w [RelIndex $w $where]
See $w
}
### Button 1 binding procedures.
#
# Double-clicking followed by a drag enters "word-select" mode.
# Triple-clicking enters "line-select" mode.
#
## Press -- ButtonPress-1 binding.
# Set the insertion cursor, claim the input focus, set up for
# future drag operations.
#
proc ttk::entry::Press {w x} {
variable State
$w icursor [ClosestGap $w $x]
$w selection clear
$w instate !disabled { focus $w }
# Set up for future drag, double-click, or triple-click.
set State(x) $x
set State(selectMode) char
set State(anchor) [$w index insert]
}
## Shift-Press -- Shift-ButtonPress-1 binding.
# Extends the selection, sets anchor for future drag operations.
#
proc ttk::entry::Shift-Press {w x} {
variable State
focus $w
set anchor [ExtendTo $w @$x]
set State(x) $x
set State(selectMode) char
set State(anchor) $anchor
}
## Select $w $x $mode -- Binding for double- and triple- clicks.
# Selects a word or line (according to mode),
# and sets the selection mode for subsequent drag operations.
#
proc ttk::entry::Select {w x mode} {
variable State
set cur [ClosestGap $w $x]
switch -- $mode {
word { WordSelect $w $cur $cur }
line { LineSelect $w $cur $cur }
char { # no-op }
}
set State(anchor) $cur
set State(selectMode) $mode
}
## Drag -- Button1 motion binding.
#
proc ttk::entry::Drag {w x} {
variable State
set State(x) $x
DragTo $w $x
}
## DragTo $w $x -- Extend selection to $x based on current selection mode.
#
proc ttk::entry::DragTo {w x} {
variable State
set cur [ClosestGap $w $x]
switch $State(selectMode) {
char { CharSelect $w $State(anchor) $cur }
word { WordSelect $w $State(anchor) $cur }
line { LineSelect $w $State(anchor) $cur }
}
}
## AutoScroll
# Called repeatedly when the mouse is outside an entry window
# with Button 1 down. Scroll the window left or right,
# depending on where the mouse is, and extend the selection
# according to the current selection mode.
#
# TODO: AutoScroll should repeat faster (50ms) than normal autorepeat.
# TODO: Need a way for Repeat scripts to cancel themselves.
#
proc ttk::entry::AutoScroll {w} {
variable State
if {![winfo exists $w]} return
set x $State(x)
if {$x > [winfo width $w]} {
$w xview scroll 2 units
DragTo $w $x
} elseif {$x < 0} {
$w xview scroll -2 units
DragTo $w $x
}
}
## CharSelect -- select characters between index $from and $to
#
proc ttk::entry::CharSelect {w from to} {
if {$to <= $from} {
$w selection range $to $from
} else {
$w selection range $from $to
}
$w icursor $to
}
## WordSelect -- Select whole words between index $from and $to
#
proc ttk::entry::WordSelect {w from to} {
if {$to < $from} {
set first [WordBack [$w get] $to]
set last [WordForward [$w get] $from]
$w icursor $first
} else {
set first [WordBack [$w get] $from]
set last [WordForward [$w get] $to]
$w icursor $last
}
$w selection range $first $last
}
## WordBack, WordForward -- helper routines for WordSelect.
#
proc ttk::entry::WordBack {text index} {
if {[set pos [tcl_wordBreakBefore $text $index]] < 0} { return 0 }
return $pos
}
proc ttk::entry::WordForward {text index} {
if {[set pos [tcl_wordBreakAfter $text $index]] < 0} { return end }
return $pos
}
## LineSelect -- Select the entire line.
#
proc ttk::entry::LineSelect {w _ _} {
variable State
$w selection range 0 end
$w icursor end
}
### Button 2 binding procedures.
#
## ScanMark -- ButtonPress-2 binding.
# Marks the start of a scan or primary transfer operation.
#
proc ttk::entry::ScanMark {w x} {
variable State
set State(scanX) $x
set State(scanIndex) [$w index @0]
set State(scanMoved) 0
}
## ScanDrag -- Button2 motion binding.
#
proc ttk::entry::ScanDrag {w x} {
variable State
set dx [expr {$State(scanX) - $x}]
if {abs($dx) > $State(deadband)} {
set State(scanMoved) 1
}
set left [expr {$State(scanIndex) + ($dx*$State(scanNum))/$State(scanDen)}]
$w xview $left
if {$left != [set newLeft [$w index @0]]} {
# We've scanned past one end of the entry;
# reset the mark so that the text will start dragging again
# as soon as the mouse reverses direction.
#
set State(scanX) $x
set State(scanIndex) $newLeft
}
}
## ScanRelease -- Button2 release binding.
# Do a primary transfer if the mouse has not moved since the button press.
#
proc ttk::entry::ScanRelease {w x} {
variable State
if {!$State(scanMoved)} {
$w instate {!disabled !readonly} {
$w icursor [ClosestGap $w $x]
catch {$w insert insert [::tk::GetSelection $w PRIMARY]}
}
}
}
### Insertion and deletion procedures.
#
## PendingDelete -- Delete selection prior to insert.
# If the entry currently has a selection, delete it and
# set the insert position to where the selection was.
# Returns: 1 if pending delete occurred, 0 if nothing was selected.
#
proc ttk::entry::PendingDelete {w} {
if {[$w selection present]} {
$w icursor sel.first
$w delete sel.first sel.last
return 1
}
return 0
}
## Insert -- Insert text into the entry widget.
# If a selection is present, the new text replaces it.
# Otherwise, the new text is inserted at the insert cursor.
#
proc ttk::entry::Insert {w s} {
if {$s eq ""} { return }
PendingDelete $w
$w insert insert $s
See $w insert
}
## Backspace -- Backspace over the character just before the insert cursor.
# If there is a selection, delete that instead.
# If the new insert position is offscreen to the left,
# scroll to place the cursor at about the middle of the window.
#
proc ttk::entry::Backspace {w} {
if {[PendingDelete $w]} {
See $w
return
}
set x [expr {[$w index insert] - 1}]
if {$x < 0} { return }
$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}]
}
}
## Delete -- Delete the character after the insert cursor.
# If there is a selection, delete that instead.
#
proc ttk::entry::Delete {w} {
if {![PendingDelete $w]} {
$w delete insert
}
}
#*EOF*
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