# Copyright (c) 2016 Ruby-GNOME2 Project Team
# This program is licenced under the same licence as Ruby-GNOME2.
#
=begin
=  Pango/Font Features

 This demonstrates support for OpenType font features with
 Pango attributes. The attributes can be used manually or
 via Pango markup.
=end
module FontFeaturesDemo
  def self.run_demo(main_window)
    builder = Gtk::Builder.new(:resource => "/font-features/font-features.ui")
    window = builder["window"]
    label = builder["label"]
    settings = builder["settings"]
    resetbutton = builder["reset"]
    font = builder["font"]
    numcasedefault = builder["numcasedefault"]
    numspacedefault = builder["numspacedefault"]
    fractiondefault = builder["fractiondefault"]
    stack = builder["stack"]
    entry = builder["entry"]
    toggle = []

    %w(kern liga dlig hlig clig smcp c2sc lnum onum pnum tnum frac afrc zero
       nalt swsh calt hist salt ss01 ss02 ss03 ss04 ss05).each do |name|
      toggle << builder[name]
    end
    text = nil

    builder.connect_signals do |name|
      case name
      when "reset"
        proc do |button|
          numcasedefault.active = true
          numspacedefault.active = true
          fractiondefault.active = true
          toggle.each do |widget|
            if widget.class != Gtk::RadioButton
              widget.active = false
              widget.sensitive = false
            end
          end
        end
      when "update"
        proc do
          update(toggle, entry, font, settings, label)
        end
      when "switch_to_entry"
        proc do
          text = entry.text
          stack.visible_child_name = "entry"
        end
      when "switch_to_label"
        proc do
          text = nil
          stack.set_visible_child_name("label")
          update(toggle, entry, font, settings, label)
        end
      when "entry_key_press"
        proc do |entry, event|
          if event.keyval == Gdk::Keyval::KEY_Escape
            entry.text = text
            text = nil
            stack.set_visible_child_name("label")
            update(toggle, entry, font, settings, label)
          end
          Gdk::Event::PROPAGATE
        end
      end
    end

    update(toggle, entry, font, settings, label)

    if !window.visible?
      window.show_all
    else
      window.destroy
    end
    window
  end

  def self.update(toggle, entry, font, settings, label)
    text = entry.text
    font_desc = font.font
    s = ""
    has_feature = false

    toggle.each do |widget|
      next unless widget.sensitive?

      if widget.class == Gtk::RadioButton
        if widget.active?
          s += ", " if has_feature
          s += widget.builder_name
          s += " 1"
          has_feature = true
        end
      else
        s += ", " if has_feature
        s += widget.builder_name
        if widget.active?
          s += " 1"
        else
          s += " 0"
        end
        has_feature = true
      end
    end
    font_settings = s
    settings.text = font_settings

    s = "<span font_desc='#{font_desc}' font_features='#{font_settings}'>#{text}</span>"
    label.markup = s
  end
end