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+#
+# Combobox bindings.
+#
+# <<NOTE-WM-TRANSIENT>>:
+#
+# Need to set [wm transient] just before mapping the popdown
+# instead of when it's created, in case a containing frame
+# has been reparented [#1818441].
+#
+# On Windows: setting [wm transient] prevents the parent
+# toplevel from becoming inactive when the popdown is posted
+# (Tk 8.4.8+)
+#
+# On X11: WM_TRANSIENT_FOR on override-redirect windows
+# may be used by compositing managers and by EWMH-aware
+# window managers (even though the older ICCCM spec says
+# it's meaningless).
+#
+# On OSX: [wm transient] does utterly the wrong thing.
+# Instead, we use [MacWindowStyle "help" "noActivates hideOnSuspend"].
+# The "noActivates" attribute prevents the parent toplevel
+# from deactivating when the popdown is posted, and is also
+# necessary for "help" windows to receive mouse events.
+# "hideOnSuspend" makes the popdown disappear (resp. reappear)
+# when the parent toplevel is deactivated (resp. reactivated).
+# (see [#1814778]). Also set [wm resizable 0 0], to prevent
+# TkAqua from shrinking the scrollbar to make room for a grow box
+# that isn't there.
+#
+# In order to work around other platform quirks in TkAqua,
+# [grab] and [focus] are set in <Map> bindings instead of
+# immediately after deiconifying the window.
+#
+
+namespace eval ttk::combobox {
+ variable Values ;# Values($cb) is -listvariable of listbox widget
+ variable State
+ set State(entryPress) 0
+}
+
+### Combobox bindings.
+#
+# Duplicate the Entry bindings, override if needed:
+#
+
+ttk::copyBindings TEntry TCombobox
+
+bind TCombobox <KeyPress-Down> { ttk::combobox::Post %W }
+bind TCombobox <KeyPress-Escape> { ttk::combobox::Unpost %W }
+
+bind TCombobox <ButtonPress-1> { ttk::combobox::Press "" %W %x %y }
+bind TCombobox <Shift-ButtonPress-1> { ttk::combobox::Press "s" %W %x %y }
+bind TCombobox <Double-ButtonPress-1> { ttk::combobox::Press "2" %W %x %y }
+bind TCombobox <Triple-ButtonPress-1> { ttk::combobox::Press "3" %W %x %y }
+bind TCombobox <B1-Motion> { ttk::combobox::Drag %W %x }
+bind TCombobox <Motion> { ttk::combobox::Motion %W %x %y }
+
+ttk::bindMouseWheel TCombobox [list ttk::combobox::Scroll %W]
+
+bind TCombobox <<TraverseIn>> { ttk::combobox::TraverseIn %W }
+
+### Combobox listbox bindings.
+#
+bind ComboboxListbox <ButtonRelease-1> { ttk::combobox::LBSelected %W }
+bind ComboboxListbox <KeyPress-Return> { ttk::combobox::LBSelected %W }
+bind ComboboxListbox <KeyPress-Escape> { ttk::combobox::LBCancel %W }
+bind ComboboxListbox <KeyPress-Tab> { ttk::combobox::LBTab %W next }
+bind ComboboxListbox <<PrevWindow>> { ttk::combobox::LBTab %W prev }
+bind ComboboxListbox <Destroy> { ttk::combobox::LBCleanup %W }
+bind ComboboxListbox <Motion> { ttk::combobox::LBHover %W %x %y }
+bind ComboboxListbox <Map> { focus -force %W }
+
+switch -- [tk windowingsystem] {
+ win32 {
+ # Dismiss listbox when user switches to a different application.
+ # NB: *only* do this on Windows (see #1814778)
+ bind ComboboxListbox <FocusOut> { ttk::combobox::LBCancel %W }
+ }
+}
+
+### Combobox popdown window bindings.
+#
+bind ComboboxPopdown <Map> { ttk::combobox::MapPopdown %W }
+bind ComboboxPopdown <Unmap> { ttk::combobox::UnmapPopdown %W }
+bind ComboboxPopdown <ButtonPress> \
+ { ttk::combobox::Unpost [winfo parent %W] }
+
+### Option database settings.
+#
+
+option add *TCombobox*Listbox.font TkTextFont widgetDefault
+option add *TCombobox*Listbox.relief flat widgetDefault
+option add *TCombobox*Listbox.highlightThickness 0 widgetDefault
+
+## Platform-specific settings.
+#
+switch -- [tk windowingsystem] {
+ x11 {
+ option add *TCombobox*Listbox.background white widgetDefault
+ }
+ aqua {
+ option add *TCombobox*Listbox.borderWidth 0 widgetDefault
+ }
+}
+
+### Binding procedures.
+#
+
+## Press $mode $x $y -- ButtonPress binding for comboboxes.
+# Either post/unpost the listbox, or perform Entry widget binding,
+# depending on widget state and location of button press.
+#
+proc ttk::combobox::Press {mode w x y} {
+ variable State
+
+ $w instate disabled { return }
+
+ set State(entryPress) [expr {
+ [$w instate !readonly]
+ && [string match *textarea [$w identify element $x $y]]
+ }]
+
+ focus $w
+ if {$State(entryPress)} {
+ switch -- $mode {
+ s { ttk::entry::Shift-Press $w $x ; # Shift }
+ 2 { ttk::entry::Select $w $x word ; # Double click}
+ 3 { ttk::entry::Select $w $x line ; # Triple click }
+ "" -
+ default { ttk::entry::Press $w $x }
+ }
+ } else {
+ Post $w
+ }
+}
+
+## Drag -- B1-Motion binding for comboboxes.
+# If the initial ButtonPress event was handled by Entry binding,
+# perform Entry widget drag binding; otherwise nothing.
+#
+proc ttk::combobox::Drag {w x} {
+ variable State
+ if {$State(entryPress)} {
+ ttk::entry::Drag $w $x
+ }
+}
+
+## Motion --
+# Set cursor.
+#
+proc ttk::combobox::Motion {w x y} {
+ if { [$w identify $x $y] eq "textarea"
+ && [$w instate {!readonly !disabled}]
+ } {
+ ttk::setCursor $w text
+ } else {
+ ttk::setCursor $w ""
+ }
+}
+
+## TraverseIn -- receive focus due to keyboard navigation
+# For editable comboboxes, set the selection and insert cursor.
+#
+proc ttk::combobox::TraverseIn {w} {
+ $w instate {!readonly !disabled} {
+ $w selection range 0 end
+ $w icursor end
+ }
+}
+
+## SelectEntry $cb $index --
+# Set the combobox selection in response to a user action.
+#
+proc ttk::combobox::SelectEntry {cb index} {
+ $cb current $index
+ $cb selection range 0 end
+ $cb icursor end
+ event generate $cb <<ComboboxSelected>> -when mark
+}
+
+## Scroll -- Mousewheel binding
+#
+proc ttk::combobox::Scroll {cb dir} {
+ $cb instate disabled { return }
+ set max [llength [$cb cget -values]]
+ set current [$cb current]
+ incr current $dir
+ if {$max != 0 && $current == $current % $max} {
+ SelectEntry $cb $current
+ }
+}
+
+## LBSelected $lb -- Activation binding for listbox
+# Set the combobox value to the currently-selected listbox value
+# and unpost the listbox.
+#
+proc ttk::combobox::LBSelected {lb} {
+ set cb [LBMaster $lb]
+ LBSelect $lb
+ Unpost $cb
+ focus $cb
+}
+
+## LBCancel --
+# Unpost the listbox.
+#
+proc ttk::combobox::LBCancel {lb} {
+ Unpost [LBMaster $lb]
+}
+
+## LBTab -- Tab key binding for combobox listbox.
+# Set the selection, and navigate to next/prev widget.
+#
+proc ttk::combobox::LBTab {lb dir} {
+ set cb [LBMaster $lb]
+ switch -- $dir {
+ next { set newFocus [tk_focusNext $cb] }
+ prev { set newFocus [tk_focusPrev $cb] }
+ }
+
+ if {$newFocus ne ""} {
+ LBSelect $lb
+ Unpost $cb
+ # The [grab release] call in [Unpost] queues events that later
+ # re-set the focus (@@@ NOTE: this might not be true anymore).
+ # Set new focus later:
+ after 0 [list ttk::traverseTo $newFocus]
+ }
+}
+
+## LBHover -- <Motion> binding for combobox listbox.
+# Follow selection on mouseover.
+#
+proc ttk::combobox::LBHover {w x y} {
+ $w selection clear 0 end
+ $w activate @$x,$y
+ $w selection set @$x,$y
+}
+
+## MapPopdown -- <Map> binding for ComboboxPopdown
+#
+proc ttk::combobox::MapPopdown {w} {
+ [winfo parent $w] state pressed
+ ttk::globalGrab $w
+}
+
+## UnmapPopdown -- <Unmap> binding for ComboboxPopdown
+#
+proc ttk::combobox::UnmapPopdown {w} {
+ [winfo parent $w] state !pressed
+ ttk::releaseGrab $w
+}
+
+## PopdownWindow --
+# Returns the popdown widget associated with a combobox,
+# creating it if necessary.
+#
+proc ttk::combobox::PopdownWindow {cb} {
+ if {![winfo exists $cb.popdown]} {
+ set poplevel [PopdownToplevel $cb.popdown]
+ set popdown [ttk::frame $poplevel.f -style ComboboxPopdownFrame]
+
+ ttk::scrollbar $popdown.sb \
+ -orient vertical -command [list $popdown.l yview]
+ listbox $popdown.l \
+ -listvariable ttk::combobox::Values($cb) \
+ -yscrollcommand [list $popdown.sb set] \
+ -exportselection false \
+ -selectmode browse \
+ -activestyle none \
+ ;
+
+ bindtags $popdown.l \
+ [list $popdown.l ComboboxListbox Listbox $popdown all]
+
+ grid $popdown.l -row 0 -column 0 -padx {1 0} -pady 1 -sticky nsew
+ grid $popdown.sb -row 0 -column 1 -padx {0 1} -pady 1 -sticky ns
+ grid columnconfigure $popdown 0 -weight 1
+ grid rowconfigure $popdown 0 -weight 1
+
+ grid $popdown -sticky news -padx 0 -pady 0
+ grid rowconfigure $poplevel 0 -weight 1
+ grid columnconfigure $poplevel 0 -weight 1
+ }
+ return $cb.popdown
+}
+
+## PopdownToplevel -- Create toplevel window for the combobox popdown
+#
+# See also <<NOTE-WM-TRANSIENT>>
+#
+proc ttk::combobox::PopdownToplevel {w} {
+ toplevel $w -class ComboboxPopdown
+ wm withdraw $w
+ switch -- [tk windowingsystem] {
+ default -
+ x11 {
+ $w configure -relief flat -borderwidth 0
+ wm attributes $w -type combo
+ wm overrideredirect $w true
+ }
+ win32 {
+ $w configure -relief flat -borderwidth 0
+ wm overrideredirect $w true
+ wm attributes $w -topmost 1
+ }
+ aqua {
+ $w configure -relief solid -borderwidth 0
+ tk::unsupported::MacWindowStyle style $w \
+ help {noActivates hideOnSuspend}
+ wm resizable $w 0 0
+ }
+ }
+ return $w
+}
+
+## ConfigureListbox --
+# Set listbox values, selection, height, and scrollbar visibility
+# from current combobox values.
+#
+proc ttk::combobox::ConfigureListbox {cb} {
+ variable Values
+
+ set popdown [PopdownWindow $cb].f
+ set values [$cb cget -values]
+ set current [$cb current]
+ if {$current < 0} {
+ set current 0 ;# no current entry, highlight first one
+ }
+ set Values($cb) $values
+ $popdown.l selection clear 0 end
+ $popdown.l selection set $current
+ $popdown.l activate $current
+ $popdown.l see $current
+ set height [llength $values]
+ if {$height > [$cb cget -height]} {
+ set height [$cb cget -height]
+ grid $popdown.sb
+ grid configure $popdown.l -padx {1 0}
+ } else {
+ grid remove $popdown.sb
+ grid configure $popdown.l -padx 1
+ }
+ $popdown.l configure -height $height
+}
+
+## PlacePopdown --
+# Set popdown window geometry.
+#
+# @@@TODO: factor with menubutton::PostPosition
+#
+proc ttk::combobox::PlacePopdown {cb popdown} {
+ set x [winfo rootx $cb]
+ set y [winfo rooty $cb]
+ set w [winfo width $cb]
+ set h [winfo height $cb]
+ set style [$cb cget -style]
+ set postoffset [ttk::style lookup $style -postoffset {} {0 0 0 0}]
+ foreach var {x y w h} delta $postoffset {
+ incr $var $delta
+ }
+
+ set H [winfo reqheight $popdown]
+ if {$y + $h + $H > [winfo screenheight $popdown]} {
+ set Y [expr {$y - $H}]
+ } else {
+ set Y [expr {$y + $h}]
+ }
+ wm geometry $popdown ${w}x${H}+${x}+${Y}
+}
+
+## Post $cb --
+# Pop down the associated listbox.
+#
+proc ttk::combobox::Post {cb} {
+ # Don't do anything if disabled:
+ #
+ $cb instate disabled { return }
+
+ # ASSERT: ![$cb instate pressed]
+
+ # Run -postcommand callback:
+ #
+ uplevel #0 [$cb cget -postcommand]
+
+ set popdown [PopdownWindow $cb]
+ ConfigureListbox $cb
+ update idletasks ;# needed for geometry propagation.
+ PlacePopdown $cb $popdown
+ # See <<NOTE-WM-TRANSIENT>>
+ switch -- [tk windowingsystem] {
+ x11 - win32 { wm transient $popdown [winfo toplevel $cb] }
+ }
+
+ # Post the listbox:
+ #
+ wm attribute $popdown -topmost 1
+ wm deiconify $popdown
+ raise $popdown
+}
+
+## Unpost $cb --
+# Unpost the listbox.
+#
+proc ttk::combobox::Unpost {cb} {
+ if {[winfo exists $cb.popdown]} {
+ wm withdraw $cb.popdown
+ }
+ grab release $cb.popdown ;# in case of stuck or unexpected grab [#1239190]
+}
+
+## LBMaster $lb --
+# Return the combobox main widget that owns the listbox.
+#
+proc ttk::combobox::LBMaster {lb} {
+ winfo parent [winfo parent [winfo parent $lb]]
+}
+
+## LBSelect $lb --
+# Transfer listbox selection to combobox value.
+#
+proc ttk::combobox::LBSelect {lb} {
+ set cb [LBMaster $lb]
+ set selection [$lb curselection]
+ if {[llength $selection] == 1} {
+ SelectEntry $cb [lindex $selection 0]
+ }
+}
+
+## LBCleanup $lb --
+# <Destroy> binding for combobox listboxes.
+# Cleans up by unsetting the linked textvariable.
+#
+# Note: we can't just use { unset [%W cget -listvariable] }
+# because the widget command is already gone when this binding fires).
+# [winfo parent] still works, fortunately.
+#
+proc ttk::combobox::LBCleanup {lb} {
+ variable Values
+ unset Values([LBMaster $lb])
+}
+
+#*EOF*