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# Copyright (c) 2016 Ruby-GNOME2 Project Team
# This program is licenced under the same licence as Ruby-GNOME2.
#
=begin
= Printing/Printing
GtkPrintOperation offers a simple API to support printing
in a cross-platform way.
=end
class PrintingDemo
HEADER_HEIGHT = 10 * 72 / 25.4
HEADER_GAP = 3 * 72 / 25.4
def initialize(main_window)
@print_operation = Gtk::PrintOperation.new
@main_window = main_window
@resource_name = File.expand_path(__FILE__)
@font_size = 12.0
@num_pages = 0
@lines_per_page = 0
@lines = []
@print_operation.signal_connect "begin-print" do |operation, context|
configure_pagination(operation, context)
end
@print_operation.signal_connect "draw-page" do |_oper, context, page_nr|
cr = initialize_cairo_context(context)
layout = initialize_pango_layout_title(context)
cr.move_to((@width - @text_width) / 2,
(HEADER_HEIGHT - @text_height) / 2)
cr.show_pango_layout(layout)
initialize_pango_layout_page_nb(layout, page_nr)
cr.move_to(@width - @text_width - 4,
(HEADER_HEIGHT - @text_height) / 2)
cr.show_pango_layout(layout)
initialize_pango_layout_page_content(context, cr, page_nr)
end
@print_operation.signal_connect "end-print" do
puts "End of print"
end
@print_operation.use_full_page = false
@print_operation.unit = :points
@print_operation.embed_page_setup = true
settings = Gtk::PrintSettings.new
settings.set(:ouput_basename, "gtk-demo")
@print_operation.print_settings = settings
end
def run
begin
@print_operation.run(:print_dialog, @main_window)
rescue => error
dialog = Gtk::MessageDialog.new(:parent => main_window,
:flags => :destroy_with_parent,
:type => :error,
:buttons => :close,
:message => error.message)
dialog.signal_connect "response" do
dialog.destroy
end
dialog.show
end
end
private
def configure_pagination(operation, context)
height = context.height - HEADER_HEIGHT - HEADER_GAP
@lines_per_page = (height / @font_size).floor
File.open(@resource_name, "r") do |file|
file.each_line do |line|
@lines << line
end
end
@num_pages = @lines.size / (@lines_per_page + 1)
operation.n_pages = @num_pages
end
def initialize_cairo_context(context)
cr = context.cairo_context
@width = context.width
cr.rectangle(0, 0, @width, HEADER_HEIGHT)
cr.set_source_rgb(0.8, 0.8, 0.8)
cr.fill_preserve
cr.set_source_rgb(0, 0, 0)
cr.line_width = 1
cr.stroke
cr
end
def initialize_pango_layout_title(context)
layout = context.create_pango_layout
desc = Pango::FontDescription.new("sans 14")
layout.font_description = desc
layout.text = @resource_name
@text_width, @text_height = layout.pixel_size
if @text_width > @width
layout.width = @width
layout.ellipsize = :start
@text_width, @text_height = layout.pixel_size
end
layout
end
def initialize_pango_layout_page_nb(layout, page_nr)
layout.text = "#{page_nr + 1}/#{@num_pages}"
layout.width = -1
@text_width, @text_height = layout.pixel_size
end
def initialize_pango_layout_page_content(context, cr, page_nr)
layout = context.create_pango_layout
desc = Pango::FontDescription.new("monospace")
desc.size = @font_size * Pango::SCALE
layout.font_description = desc
cr.move_to(0, HEADER_HEIGHT + HEADER_GAP)
start_line = page_nr * @lines_per_page
@lines[start_line, @lines_per_page].each do |line|
layout.text = line
cr.show_pango_layout(layout)
cr.rel_move_to(0, @font_size)
end
end
end
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