4 child_size_allocate (GtkWidget *child,
5 GdkRectangle *allocation,
8 GtkStyleContext *context;
9 context = gtk_widget_get_style_context (child);
11 g_print ("Child %p\nHas left? %d\nHas right? %d\nHas top? %d\nHas bottom? %d\n",
13 gtk_style_context_has_class (context, "left"),
14 gtk_style_context_has_class (context, "right"),
15 gtk_style_context_has_class (context, "top"),
16 gtk_style_context_has_class (context, "bottom"));
20 overlay_get_child_position (GtkOverlay *overlay,
22 GdkRectangle *allocation,
25 GtkWidget *custom_child = user_data;
28 if (child != custom_child)
31 gtk_widget_get_preferred_size (child, NULL, &req);
35 allocation->width = req.width;
36 allocation->height = req.height;
42 main (int argc, char *argv[])
44 GtkWidget *win, *overlay, *grid, *main_child, *child, *label, *sw;
48 gtk_init (&argc, &argv);
50 win = gtk_window_new (GTK_WINDOW_TOPLEVEL);
51 gtk_window_set_default_size (GTK_WINDOW (win), 600, 600);
53 grid = gtk_grid_new ();
54 child = gtk_event_box_new ();
55 gdk_rgba_parse (&color, "red");
56 gtk_widget_override_background_color (child, 0, &color);
57 gtk_widget_set_hexpand (child, TRUE);
58 gtk_widget_set_vexpand (child, TRUE);
59 gtk_container_add (GTK_CONTAINER (grid), child);
60 label = gtk_label_new ("Out of overlay");
61 gtk_container_add (GTK_CONTAINER (child), label);
63 overlay = gtk_overlay_new ();
64 sw = gtk_scrolled_window_new (NULL, NULL);
65 gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (sw),
68 gtk_container_add (GTK_CONTAINER (overlay), sw);
70 main_child = gtk_event_box_new ();
71 gtk_container_add (GTK_CONTAINER (sw), main_child);
72 gdk_rgba_parse (&color, "green");
73 gtk_widget_override_background_color (main_child, 0, &color);
74 gtk_widget_set_hexpand (main_child, TRUE);
75 gtk_widget_set_vexpand (main_child, TRUE);
76 label = gtk_label_new ("Main child");
77 gtk_container_add (GTK_CONTAINER (main_child), label);
79 child = gtk_label_new (NULL);
80 str = g_strdup_printf ("%p", child);
81 gtk_label_set_text (GTK_LABEL (child), str);
83 g_print ("Bottom/Right child: %p\n", child);
84 gtk_widget_set_halign (child, GTK_ALIGN_END);
85 gtk_widget_set_valign (child, GTK_ALIGN_END);
86 gtk_overlay_add_overlay (GTK_OVERLAY (overlay), child);
88 g_signal_connect (child, "size-allocate",
89 G_CALLBACK (child_size_allocate), overlay);
91 child = gtk_label_new (NULL);
92 str = g_strdup_printf ("%p", child);
93 gtk_label_set_text (GTK_LABEL (child), str);
95 g_print ("Left/Top child: %p\n", child);
96 gtk_widget_set_halign (child, GTK_ALIGN_START);
97 gtk_widget_set_valign (child, GTK_ALIGN_START);
98 gtk_overlay_add_overlay (GTK_OVERLAY (overlay), child);
100 g_signal_connect (child, "size-allocate",
101 G_CALLBACK (child_size_allocate), overlay);
103 child = gtk_label_new (NULL);
104 str = g_strdup_printf ("%p", child);
105 gtk_label_set_text (GTK_LABEL (child), str);
107 g_print ("Right/Center child: %p\n", child);
108 gtk_widget_set_halign (child, GTK_ALIGN_END);
109 gtk_widget_set_valign (child, GTK_ALIGN_CENTER);
110 gtk_overlay_add_overlay (GTK_OVERLAY (overlay), child);
112 g_signal_connect (child, "size-allocate",
113 G_CALLBACK (child_size_allocate), overlay);
115 child = gtk_label_new (NULL);
116 str = g_strdup_printf ("%p", child);
117 gtk_label_set_text (GTK_LABEL (child), str);
119 gtk_widget_set_margin_left (child, 55);
120 gtk_widget_set_margin_top (child, 4);
121 g_print ("Left/Top margined child: %p\n", child);
122 gtk_widget_set_halign (child, GTK_ALIGN_START);
123 gtk_widget_set_valign (child, GTK_ALIGN_START);
124 gtk_overlay_add_overlay (GTK_OVERLAY (overlay), child);
126 g_signal_connect (child, "size-allocate",
127 G_CALLBACK (child_size_allocate), overlay);
129 child = gtk_label_new (NULL);
130 str = g_strdup_printf ("%p", child);
131 gtk_label_set_text (GTK_LABEL (child), str);
133 g_print ("Custom get-child-position child: %p\n", child);
134 gtk_widget_set_halign (child, GTK_ALIGN_START);
135 gtk_widget_set_valign (child, GTK_ALIGN_START);
136 gtk_overlay_add_overlay (GTK_OVERLAY (overlay), child);
138 g_signal_connect (child, "size-allocate",
139 G_CALLBACK (child_size_allocate), overlay);
140 g_signal_connect (overlay, "get-child-position",
141 G_CALLBACK (overlay_get_child_position), child);
143 gtk_grid_attach (GTK_GRID (grid), overlay, 1, 0, 1, 3);
144 gtk_container_add (GTK_CONTAINER (win), grid);
148 gtk_widget_show_all (win);