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
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
#include <gtk/gtk.h>
static void
child_size_allocate (GtkWidget *child,
GdkRectangle *allocation,
gpointer user_data)
{
GtkStyleContext *context;
context = gtk_widget_get_style_context (child);
g_print ("Child %p\nHas left? %d\nHas right? %d\nHas top? %d\nHas bottom? %d\n",
child,
gtk_style_context_has_class (context, "left"),
gtk_style_context_has_class (context, "right"),
gtk_style_context_has_class (context, "top"),
gtk_style_context_has_class (context, "bottom"));
}
static gboolean
overlay_get_child_position (GtkOverlay *overlay,
GtkWidget *child,
GdkRectangle *allocation,
gpointer user_data)
{
GtkWidget *custom_child = user_data;
GtkRequisition req;
if (child != custom_child)
return FALSE;
gtk_widget_get_preferred_size (child, NULL, &req);
allocation->x = 120;
allocation->y = 0;
allocation->width = req.width;
allocation->height = req.height;
return TRUE;
}
int
main (int argc, char *argv[])
{
GtkWidget *win, *overlay, *grid, *main_child, *child, *label, *sw;
GtkCssProvider *provider;
gchar *str;
gtk_init (&argc, &argv);
provider = gtk_css_provider_new ();
gtk_css_provider_load_from_data (provider,
"GtkLabel { border: 3px solid black; border-radius: 5px; padding: 2px; }"
".top { border-top-style: none; right-radius: 0px; border-top-left-radius: 0px; }"
".bottom { border-bottom-style: none; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; }"
".left { border-left-style: none; border-top-left-radius: 0px; border-bottom-left-radius: 0px; }"
".right { border-right-style: none; border-top-right-radius: 0px; border-bottom-right-radius: 0px; }",
-1, NULL);
gtk_style_context_add_provider_for_screen (gdk_screen_get_default (),
GTK_STYLE_PROVIDER (provider),
GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
win = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_default_size (GTK_WINDOW (win), 600, 600);
grid = gtk_grid_new ();
child = gtk_event_box_new ();
gtk_widget_set_hexpand (child, TRUE);
gtk_widget_set_vexpand (child, TRUE);
gtk_container_add (GTK_CONTAINER (grid), child);
label = gtk_label_new ("Out of overlay");
gtk_container_add (GTK_CONTAINER (child), label);
overlay = gtk_overlay_new ();
sw = gtk_scrolled_window_new (NULL, NULL);
gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (sw),
GTK_POLICY_ALWAYS,
GTK_POLICY_ALWAYS);
gtk_container_add (GTK_CONTAINER (overlay), sw);
main_child = gtk_event_box_new ();
gtk_container_add (GTK_CONTAINER (sw), main_child);
gtk_widget_set_hexpand (main_child, TRUE);
gtk_widget_set_vexpand (main_child, TRUE);
label = gtk_label_new ("Main child");
gtk_widget_set_halign (label, GTK_ALIGN_CENTER);
gtk_widget_set_valign (label, GTK_ALIGN_CENTER);
gtk_container_add (GTK_CONTAINER (main_child), label);
child = gtk_label_new (NULL);
str = g_strdup_printf ("%p", child);
gtk_label_set_text (GTK_LABEL (child), str);
g_free (str);
g_print ("Bottom/Right child: %p\n", child);
gtk_widget_set_halign (child, GTK_ALIGN_END);
gtk_widget_set_valign (child, GTK_ALIGN_END);
gtk_overlay_add_overlay (GTK_OVERLAY (overlay), child);
g_signal_connect (child, "size-allocate",
G_CALLBACK (child_size_allocate), overlay);
child = gtk_label_new (NULL);
str = g_strdup_printf ("%p", child);
gtk_label_set_text (GTK_LABEL (child), str);
g_free (str);
g_print ("Left/Top child: %p\n", child);
gtk_widget_set_halign (child, GTK_ALIGN_START);
gtk_widget_set_valign (child, GTK_ALIGN_START);
gtk_overlay_add_overlay (GTK_OVERLAY (overlay), child);
g_signal_connect (child, "size-allocate",
G_CALLBACK (child_size_allocate), overlay);
child = gtk_label_new (NULL);
str = g_strdup_printf ("%p", child);
gtk_label_set_text (GTK_LABEL (child), str);
g_free (str);
g_print ("Right/Center child: %p\n", child);
gtk_widget_set_halign (child, GTK_ALIGN_END);
gtk_widget_set_valign (child, GTK_ALIGN_CENTER);
gtk_overlay_add_overlay (GTK_OVERLAY (overlay), child);
g_signal_connect (child, "size-allocate",
G_CALLBACK (child_size_allocate), overlay);
child = gtk_label_new (NULL);
str = g_strdup_printf ("%p", child);
gtk_label_set_text (GTK_LABEL (child), str);
g_free (str);
gtk_widget_set_margin_start (child, 55);
gtk_widget_set_margin_top (child, 4);
g_print ("Left/Top margined child: %p\n", child);
gtk_widget_set_halign (child, GTK_ALIGN_START);
gtk_widget_set_valign (child, GTK_ALIGN_START);
gtk_overlay_add_overlay (GTK_OVERLAY (overlay), child);
g_signal_connect (child, "size-allocate",
G_CALLBACK (child_size_allocate), overlay);
child = gtk_label_new (NULL);
str = g_strdup_printf ("%p", child);
gtk_label_set_text (GTK_LABEL (child), str);
g_free (str);
g_print ("Custom get-child-position child: %p\n", child);
gtk_widget_set_halign (child, GTK_ALIGN_START);
gtk_widget_set_valign (child, GTK_ALIGN_START);
gtk_overlay_add_overlay (GTK_OVERLAY (overlay), child);
g_signal_connect (child, "size-allocate",
G_CALLBACK (child_size_allocate), overlay);
g_signal_connect (overlay, "get-child-position",
G_CALLBACK (overlay_get_child_position), child);
gtk_grid_attach (GTK_GRID (grid), overlay, 1, 0, 1, 3);
gtk_container_add (GTK_CONTAINER (win), grid);
g_print ("\n");
gtk_widget_show_all (win);
gtk_main ();
return 0;
}
|
