84 lines
2.9 KiB
Tcl
84 lines
2.9 KiB
Tcl
#
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# Bindings for Buttons, Checkbuttons, and Radiobuttons.
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#
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# Notes: <Button1-Leave>, <Button1-Enter> only control the "pressed"
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# state; widgets remain "active" if the pointer is dragged out.
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# This doesn't seem to be conventional, but it's a nice way
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# to provide extra feedback while the grab is active.
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# (If the button is released off the widget, the grab deactivates and
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# we get a <Leave> event then, which turns off the "active" state)
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#
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# Normally, <ButtonRelease> and <ButtonN-Enter/Leave> events are
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# delivered to the widget which received the initial <ButtonPress>
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# event. However, Tk [grab]s (#1223103) and menu interactions
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# (#1222605) can interfere with this. To guard against spurious
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# <Button1-Enter> events, the <Button1-Enter> binding only sets
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# the pressed state if the button is currently active.
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#
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namespace eval ttk::button {}
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bind TButton <Enter> { %W instate !disabled {%W state active} }
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bind TButton <Leave> { %W state !active }
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bind TButton <Key-space> { ttk::button::activate %W }
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bind TButton <<Invoke>> { ttk::button::activate %W }
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bind TButton <ButtonPress-1> \
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{ %W instate !disabled { ttk::clickToFocus %W; %W state pressed } }
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bind TButton <ButtonRelease-1> \
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{ %W instate pressed { %W state !pressed; %W instate !disabled { %W invoke } } }
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bind TButton <Button1-Leave> \
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{ %W state !pressed }
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bind TButton <Button1-Enter> \
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{ %W instate {active !disabled} { %W state pressed } }
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# Checkbuttons and Radiobuttons have the same bindings as Buttons:
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#
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ttk::copyBindings TButton TCheckbutton
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ttk::copyBindings TButton TRadiobutton
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# ...plus a few more:
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bind TRadiobutton <KeyPress-Up> { ttk::button::RadioTraverse %W -1 }
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bind TRadiobutton <KeyPress-Down> { ttk::button::RadioTraverse %W +1 }
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# bind TCheckbutton <KeyPress-plus> { %W select }
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# bind TCheckbutton <KeyPress-minus> { %W deselect }
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# activate --
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# Simulate a button press: temporarily set the state to 'pressed',
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# then invoke the button.
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#
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proc ttk::button::activate {w} {
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$w instate disabled { return }
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set oldState [$w state pressed]
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update idletasks; after 100 ;# block event loop to avoid reentrancy
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$w state $oldState
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$w invoke
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}
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# RadioTraverse -- up/down keyboard traversal for radiobutton groups.
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# Set focus to previous/next radiobutton in a group.
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# A radiobutton group consists of all the radiobuttons with
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# the same parent and -variable; this is a pretty good heuristic
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# that works most of the time.
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#
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proc ttk::button::RadioTraverse {w dir} {
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set group [list]
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foreach sibling [winfo children [winfo parent $w]] {
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if { [winfo class $sibling] eq "TRadiobutton"
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&& [$sibling cget -variable] eq [$w cget -variable]
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&& ![$sibling instate disabled]
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} {
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lappend group $sibling
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}
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}
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if {![llength $group]} { # Shouldn't happen, but can.
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return
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}
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set pos [expr {([lsearch -exact $group $w] + $dir) % [llength $group]}]
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tk::TabToWindow [lindex $group $pos]
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}
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