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
|
# Copyright (c) 2015-2016 Ruby-GNOME2 Project Team
# This program is licenced under the same licence as Ruby-GNOME2.
#
=begin
= Theming/Shadows
This demo shows how to use CSS shadows.
=end
class CssShadowsDemo
def initialize(main_window)
@window = Gtk::Window.new(:toplevel)
@window.title = "Shadows"
@window.transient_for = main_window
@window.set_default_size(400, 300)
paned = Gtk::Paned.new(:vertical)
@window.add(paned)
child = create_toolbar
paned.add(child)
@default_css = Gio::Resources.lookup_data("/css_shadows/gtk.css")
initialize_text_buffer
initialize_provider
container = Gtk::ScrolledWindow.new
paned.add(container)
child = Gtk::TextView.new(@text)
container.add(child)
apply_style(@window, @provider)
end
def run
if !@window.visible?
@window.show_all
else
@window.destroy
end
@window
end
private
def create_toolbar
toolbar = Gtk::Toolbar.new
toolbar.set_valign(:center)
item = Gtk::ToolButton.new
item.set_icon_name("go-next")
toolbar.insert(item, -1)
item = Gtk::ToolButton.new
item.set_icon_name("go-previous")
toolbar.insert(item, -1)
item = Gtk::ToolButton.new(:label => "Hello World")
item.set_is_important(true)
toolbar.insert(item, -1)
toolbar
end
def apply_style(widget, provider)
style_context = widget.style_context
style_context.add_provider(provider, Gtk::StyleProvider::PRIORITY_USER)
return unless widget.respond_to?(:children)
widget.children.each do |child|
apply_style(child, provider)
end
end
def initialize_text_buffer
@text = Gtk::TextBuffer.new
@text.create_tag("warning", "underline" => Pango::UNDERLINE_SINGLE)
@text.create_tag("error", "underline" => Pango::UNDERLINE_ERROR)
@text.text = @default_css
text_buffer_signal_connect_changed
end
def text_buffer_signal_connect_changed
@text.signal_connect "changed" do |buffer|
buffer.remove_all_tags(buffer.start_iter, buffer.end_iter)
modified_text = buffer.get_text(buffer.start_iter,
buffer.end_iter,
false)
begin
@provider.load_from_data(modified_text)
rescue
@provider.load_from_data(@default_css)
end
Gtk::StyleContext.reset_widgets
end
end
def initialize_provider
@provider = Gtk::CssProvider.new
@provider.load_from_data(@default_css)
provider_signal_connect_parsing_error
end
def provider_signal_connect_parsing_error
@provider.signal_connect "parsing-error" do |_css_provider, section, error|
start_i = @text.get_iter_at(:line => section.start_line,
:index => section.start_position)
end_i = @text.get_iter_at(:line => section.end_line,
:index => section.end_position)
tag = error == Gtk::CssProviderError::DEPRECATED ? "warning" : "error"
@text.apply_tag_by_name(tag, start_i, end_i)
end
end
end
|
