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