From fcbf63e62c627deae76c1b8cb8c0876c536ed811 Mon Sep 17 00:00:00 2001
From: Jari Vetoniemi <jari.vetoniemi@indooratlas.com>
Date: Mon, 16 Mar 2020 18:49:26 +0900
Subject: Fresh start

---
 jni/ruby/ext/tk/sample/editable_listbox.rb | 148 +++++++++++++++++++++++++++++
 1 file changed, 148 insertions(+)
 create mode 100644 jni/ruby/ext/tk/sample/editable_listbox.rb

(limited to 'jni/ruby/ext/tk/sample/editable_listbox.rb')

diff --git a/jni/ruby/ext/tk/sample/editable_listbox.rb b/jni/ruby/ext/tk/sample/editable_listbox.rb
new file mode 100644
index 0000000..890aec0
--- /dev/null
+++ b/jni/ruby/ext/tk/sample/editable_listbox.rb
@@ -0,0 +1,148 @@
+#
+# Tk::RbWidget::Editable_Listbox class
+#
+#   When "DoubleClick-1" on a listbox item, the entry box is opend 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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