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#include <gtk/gtk.h>
static void
child_size_allocate (GtkWidget *child,
GdkRectangle *allocation,
gint baseline,
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 ();
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);
gtk_style_context_add_provider_for_display (gdk_display_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 ();
label = gtk_label_new ("Out of overlay");
gtk_widget_set_hexpand (label, TRUE);
gtk_widget_set_vexpand (label, TRUE);
gtk_container_add (GTK_CONTAINER (grid), 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_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
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 (win);
gtk_main ();
return 0;
}
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