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
|
#!/usr/bin/env ruby
#
# This sample code is a port of clutter/examples/scroll-actor.c.
# It is licensed under the terms of the GNU Lesser General Public
# License, version 2.1 or (at your option) later.
#
# Copyright (C) 2013 Ruby-GNOME2 Project Team
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
require "clutter"
stage = Clutter::Stage.new
stage.title = "Scroll Actor"
stage.user_resizable = true
stage.signal_connect("destroy") do
Clutter.main_quit
end
selected_item_index = nil
select_item_at_index = lambda do |scroll, index|
menu = scroll.first_child
if selected_item_index
item = menu.get_child_at_index(selected_item_index)
item.color = Clutter::Color.new(:white)
end
index = index % menu.n_children
item = menu.get_child_at_index(index)
succeeded, x, y = item.position
scroll.save_easing_state do
scroll.scroll_to_point(Clutter::Point.new(x, y))
end
item.color = Clutter::Color.new(:sky_blue_light)
selected_item_index = index
end
stage.signal_connect("key-press-event") do |actor, event|
scroll = stage.first_child
case event.key_symbol
when Clutter::Keys::KEY_Up
select_item_at_index.call(scroll, selected_item_index - 1)
when Clutter::Keys::KEY_Down
select_item_at_index.call(scroll, selected_item_index + 1)
end
Clutter::Event::STOP
end
scroll = Clutter::ScrollActor.new
scroll.name = "scroll"
scroll.set_position(0.0, 18.0)
scroll.add_constraint(Clutter::AlignConstraint.new(stage, :x_axis, 0.5))
scroll.add_constraint(Clutter::BindConstraint.new(stage, :height, -36.0))
scroll.scroll_mode = :vertically
layout_manager = Clutter::BoxLayout.new
layout_manager.orientation = :vertical
layout_manager.spacing = 12.0
menu = Clutter::Actor.new
menu.layout_manager = layout_manager
menu.background_color = Clutter::Color.new(:black)
n_items = 11
n_items.times do |i|
text = Clutter::Text.new
text.font_name = "Sans Bold 24"
text.text = "Option #{i + 1}"
text.color = Clutter::Color.new(:white)
text.margin_left = 12.0
text.margin_right = 12.0
menu.add_child(text)
end
scroll.add_child(menu)
select_item_at_index.call(scroll, 0)
stage.add_child(scroll)
stage.show
Clutter.main
|
