1/* -*- Mode: vala; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
2 *
3 * Copyright © 2015 Michael Catanzaro <mcatanzaro@gnome.org>
4 *
5 * This file is part of libgnome-games-support.
6 *
7 * libgnome-games-support is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * libgnome-games-support is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with libgnome-games-support.  If not, see <http://www.gnu.org/licenses/>.
19 */
20
21// A container that guarantees that the internal allocated space is a fixed
22// multiple of an integer. This is a fairly literal translation of the LGPLv2+
23// original by Callum McKenzie, itself based on GtkFrame and GtkAspectFrame.
24
25namespace Games {
26
27public class GridFrame : Gtk.Bin
28{
29    private int _xpadding = 0;
30    public int xpadding
31    {
32        get { return _xpadding; }
33
34        set
35        {
36            if (value >= 0)
37            {
38                _xpadding = value;
39                queue_resize ();
40            }
41        }
42    }
43
44    private int _ypadding = 0;
45    public int ypadding
46    {
47        get { return _ypadding; }
48
49        set
50        {
51            if (value >= 0)
52            {
53                _ypadding = value;
54                queue_resize ();
55            }
56        }
57    }
58
59    private int _xmult = 1;
60    public int width
61    {
62        get { return _xmult; }
63
64        set
65        {
66            if (value > 0)
67            {
68                _xmult = value;
69                queue_resize ();
70            }
71        }
72    }
73
74    private int _ymult = 1;
75    public int height
76    {
77        get { return _ymult; }
78
79        set
80        {
81            if (value > 0)
82            {
83                _ymult = value;
84                queue_resize ();
85            }
86        }
87    }
88
89    private float _xalign = 0.5f;
90    public float xalign
91    {
92        get { return _xalign; }
93
94        set
95        {
96            _xalign = value.clamp (0.0f, 1.0f);
97            queue_resize ();
98        }
99    }
100
101    private float _yalign = 0.5f;
102    public float yalign
103    {
104        get { return _yalign; }
105
106        set
107        {
108            _yalign = value.clamp (0.0f, 1.0f);
109            queue_resize ();
110        }
111    }
112
113    private Gtk.Allocation old_allocation;
114
115    public GridFrame (int width, int height)
116    {
117        Object (width: width, height: height);
118    }
119
120    public new void @set (int width, int height)
121    {
122        this.width = width;
123        this.height = height;
124    }
125
126    public void set_padding (int xpadding, int ypadding)
127    {
128        this.xpadding = xpadding;
129        this.ypadding = ypadding;
130    }
131
132    public void set_alignment (float xalign, float yalign)
133    {
134        this.xalign = xalign;
135        this.yalign = yalign;
136    }
137
138    public override void size_allocate (Gtk.Allocation allocation)
139    {
140        base.size_allocate (allocation);
141
142        int xsize = int.max (1, (allocation.width - _xpadding) / _xmult);
143        int ysize = int.max (1, (allocation.height - _ypadding) / _ymult);
144        int size = int.min (xsize, ysize);
145
146        Gtk.Allocation child_allocation = { 0, 0, 0, 0 };
147        child_allocation.width = size * _xmult + _xpadding;
148        child_allocation.height = size * _ymult + _ypadding;
149        child_allocation.x = (int) ((allocation.width - child_allocation.width) * _xalign + allocation.x);
150        child_allocation.y = (int) ((allocation.height - child_allocation.height) * _yalign + allocation.y);
151
152        if (get_mapped () &&
153            (child_allocation.x != old_allocation.x ||
154             child_allocation.y != old_allocation.y ||
155             child_allocation.width != old_allocation.width ||
156             child_allocation.height != old_allocation.height))
157        {
158            get_window ().invalidate_rect (allocation, false);
159        }
160
161        Gtk.Widget child = get_child ();
162        if (child != null && child.get_visible ())
163            child.size_allocate (child_allocation);
164
165        old_allocation = child_allocation;
166    }
167}
168
169}  // namespace Games
170