1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
|
# Copyright (c) 2008 Ruby-GNOME2 Project Team
# This program is licenced under the same licence as Ruby-GNOME2.
=begin
= Printing
Gtk::PrintOperation offers a simple API to support printing
in a cross-platform way.
=end
require 'common'
module Demo
class Printing < BasicWindow
Data = Struct.new(:font_size, :lines_per_page, :lines, :n_pages)
HEADER_HEIGHT = 10 * 72 / 25.4
HEADER_GAP = 3 * 72 / 25.4
def initialize
super('Printing')
button = Gtk::Button.new("Print...")
button.signal_connect("clicked") do
begin
run_print_operation
rescue
dialog = Gtk::MessageDialog.new(self, :destroy_with_parent, :error,
:close, $!.message)
dialog.signal_connect("response") do
dialog.destroy
true
end
dialog.show
end
true
end
add(button)
end
private
def run_print_operation
operation = Gtk::PrintOperation.new
data = Data.new
data.font_size = 12.0
operation.signal_connect("begin-print") do |_operation, context|
on_begin_print(_operation, context, data)
end
operation.signal_connect("draw-page") do |_operation, context, page_number|
on_draw_page(_operation, context, page_number, data)
end
operation.signal_connect("end-print") do |_operation, context|
on_end_print(_operation, context, data)
end
operation.use_full_page = false
operation.unit = :points
operation.run(:print_dialog, self)
end
def on_begin_print(operation, context, data)
height = context.height - HEADER_HEIGHT - HEADER_GAP
data.lines_per_page = (height / data.font_size).floor
data.lines = File.readlines(__FILE__)
data.n_pages = (data.lines.size - 1) / data.lines_per_page + 1
operation.set_n_pages(data.n_pages)
end
def on_draw_page(operation, context, page_number, data)
cr = context.cairo_context
draw_header(cr, operation, context, page_number, data)
draw_body(cr, operation, context, page_number, data)
end
def draw_header(cr, operation, context, page_number, data)
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
layout = context.create_pango_layout
layout.font_description = "sans 14"
layout.text = File.basename(__FILE__)
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
y = (HEADER_HEIGHT - text_height) / 2
cr.move_to((width - text_width) / 2, y)
cr.show_pango_layout(layout)
layout.text = "#{page_number + 1}/#{data.n_pages}"
layout.width = -1
text_width, text_height = layout.pixel_size
cr.move_to(width - text_width - 4, y)
cr.show_pango_layout(layout)
end
def draw_body(cr, operation, context, page_number, data)
layout = context.create_pango_layout
description = Pango::FontDescription.new("monospace")
description.size = data.font_size * Pango::SCALE
layout.font_description = description
cr.move_to(0, HEADER_HEIGHT + HEADER_GAP)
start_line = page_number * data.lines_per_page
data.lines[start_line, data.lines_per_page].each do |line|
layout.text = line
cr.show_pango_layout(layout)
cr.rel_move_to(0, data.font_size)
end
end
def on_end_print(operation, context, data)
end
end
end
|
