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# frozen_string_literal: false
#
# Tk::RbWidget::Editable_Listbox class
#
# When "DoubleClick-1" on a listbox item, the entry box is opened on the
# item. And when hit "Return" key on the entry box after modifying the
# text, the entry box is closed and the item is changed. Or when hit
# "Escape" key, the entry box is closed without modification.
#
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
#
require 'tk'
module Tk
module RbWidget
class Editable_Listbox < TkListbox
end
end
end
class Tk::RbWidget::Editable_Listbox < TkListbox
#------------------------------------
BindTag = TkBindTag.new_by_name(self.to_s.gsub(/::/, '#'))
BindTag.bind('FocusIn', :widget){|w|
w.instance_eval{
if idx = @ebox.pos
see(idx) if bbox(idx).empty?
@ebox.focus(true)
end
}
}
BindTag.bind('Double-1', :widget, :y){|w, y|
w.instance_eval{ _ebox_placer(nearest(y)) }
}
BindTag.bind('Return', :widget){|w|
w.instance_eval{
if idx = index(:active)
_ebox_placer(idx)
end
}
}
#------------------------------------
def configure(*args)
ret = super
case cget(:state)
when 'normal'
# do nothing
when 'disabled'
_ebox_erase
else # unknown
# do nothing
end
ret
end
def _ebox_move(idx)
return nil if cget(:state) == 'disabled'
x, y, w, h = bbox(idx)
return nil unless y && h
@ebox.place(:x => 0, :relwidth => 1.0,
:y => y - selectborderwidth,
:height => h + 2 * selectborderwidth)
@ebox.pos = idx
@ebox.focus
end
def _ebox_placer(idx)
return nil unless _ebox_move(idx)
@ebox.value = listvariable.list[idx]
@ebox.xview_moveto(self.xview[0])
end
def _ebox_erase
@ebox.place_forget
@ebox.pos = nil
end
private :_ebox_move, :_ebox_placer, :_ebox_erase
def _setup_ebox_bindings
# bindings for entry
@ebox.bind('Return'){
list = listvariable.list
list[@ebox.pos] = @ebox.value if @ebox.pos
listvariable.value = list
_ebox_erase
focus
}
@ebox.bind('Escape'){ _ebox_erase }
end
def _setup_listbox_bindings
# bindings for listbox
tags = bindtags
bindtags(tags.insert(tags.index(self) + 1, self.class::BindTag))
end
private :_setup_ebox_bindings, :_setup_listbox_bindings
def yview(*args)
if !@ebox.pos || bbox(@ebox.pos).empty?
@ebox.place_forget
else
_ebox_move(@ebox.pos)
end
super
end
def create_self(keys)
super(keys)
unless self.listvariable
self.listvariable = TkVariable.new(self.get(0, :end))
end
@ebox = TkEntry.new(self){
@pos = nil
def self.pos; @pos; end
def self.pos=(idx); @pos = idx; end
}
_setup_ebox_bindings
_setup_listbox_bindings
end
end
if $0 == __FILE__
#lbox0 = TkListbox.new.pack(:side=>:left)
#lbox0.insert(:end, 0,1,2,3,4,5,6,7,8,9,0,1,2,3)
scr = TkScrollbar.new.pack(:side=>:right, :fill=>:y)
lbox1 = Tk::RbWidget::Editable_Listbox.new.pack(:side=>:left)
lbox2 = Tk::RbWidget::Editable_Listbox.new.pack(:side=>:left)
scr.assign(lbox1, lbox2)
lbox1.insert(:end, *%w(a b c d e f g h i j k l m n))
lbox2.insert(:end, 0,1,2,3,4,5,6,7,8,9,0,1,2,3)
Tk.mainloop
end
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