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# Copyright (c) 2015-2016 Ruby-GNOME2 Project Team
# This program is licenced under the same licence as Ruby-GNOME2.
#
=begin
= Color Chooser
A GtkColorChooser lets the user choose a color. There are several
implementations of the GtkColorChooser interface in GTK+. The
GtkColorChooserDialog is a prebuilt dialog containing a
GtkColorChooserWidget.
=end
class ColorselDemo
def initialize(main_window)
@color = Gdk::RGBA.new(0, 0, 1, 1)
@window = Gtk::Window.new(:toplevel)
@window.screen = main_window.screen
@window.title = "Color Chooser"
@window.border_width = 8
vbox = Gtk::Box.new(:vertical, 8)
vbox.border_width = 8
@window.add(vbox)
frame = initialize_drawing_area_frame
vbox.pack_start(frame, :expand => true, :fill => true, :padding => 0)
button = initialize_color_chooser_button
vbox.pack_start(button, :expand => false, :fill => false, :padding => 0)
end
def run
if !@window.visible?
@window.show_all
else
@window.destroy
end
@window
end
private
def initialize_drawing_area_frame
frame = Gtk::Frame.new
frame.shadow_type = :in
@da = Gtk::DrawingArea.new
@da.signal_connect "draw" do |_widget, cr|
cr.set_source(@color.to_a)
cr.paint
end
@da.set_size_request(200, 200)
frame.add(@da)
frame
end
def initialize_color_chooser_button
button = Gtk::Button.new(:mnemonic => "_Change the above color")
button.set_halign(:end)
button.set_valign(:center)
button.signal_connect "clicked" do |_widget|
generate_color_chooser_dialog
end
button
end
def generate_color_chooser_dialog
dialog = Gtk::ColorChooserDialog.new(:title => "Changing Color",
:parent => @window)
dialog.modal = true
dialog.rgba = @color
dialog.signal_connect "response" do |widget, response_id|
@color = widget.rgba if response_id == Gtk::ResponseType::OK
@da.queue_draw # force da to use the new color now
widget.destroy
end
dialog.show_all
end
end
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