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# Copyright (c) 2015-2016 Ruby-GNOME2 Project Team
# This program is licenced under the same licence as Ruby-GNOME2.
#
=begin
= Overlay/Decorative Overlay
Another example of an overlay with some decorative
and some interactive controls.
=end
class Overlay2Demo
def initialize(_main_window)
@window = Gtk::Window.new(:toplevel)
@window.set_default_size(500, 510)
@window.title = "Decorative Overlay"
@overlay = Gtk::Overlay.new
sw = Gtk::ScrolledWindow.new
sw.set_policy(:automatic, :automatic)
initialize_textview
@window.add(@overlay)
@overlay.add(sw)
sw.add(@text)
generate_image_in_overlay("/overlay2/decor1.png", :start)
generate_image_in_overlay("/overlay2/decor2.png", :end)
generate_adjustment
generate_scale_in_overlay
@overlay.show_all
end
def run
if !@window.visible?
@window.show_all
else
@window.destroy
end
@window
end
private
def generate_image_in_overlay(resource, position)
image = Gtk::Image.new(:resource => resource)
@overlay.add_overlay(image)
@overlay.set_overlay_pass_through(image, true)
image.halign = position
image.valign = position
end
def generate_adjustment
@adjustment = Gtk::Adjustment.new(0, 0, 100, 1, 1, 0)
@adjustment.signal_connect "value-changed" do |widget|
value = widget.value
@text.set_left_margin(value)
@tag.set_property("pixels-above-lines", value)
end
@adjustment.value = 100
end
def generate_scale_in_overlay
scale = Gtk::Scale.new(:horizontal, @adjustment)
scale.draw_value = false
scale.set_size_request(120, -1)
scale.margin_start = 20
scale.margin_end = 20
scale.margin_bottom = 20
@overlay.add_overlay(scale)
scale.halign = :start
scale.valign = :end
scale.tooltip_text = "Margin"
end
def initialize_textview
@text = Gtk::TextView.new
buffer = @text.buffer
buffer.text = "Dear Diary..."
@tag = buffer.create_tag("top-margin", "pixels-above-lines" => 0)
word_end = buffer.start_iter
word_end.forward_word_end
buffer.apply_tag(@tag, buffer.start_iter, word_end)
end
end
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