* examples/example-4.c (font_family_new), (font_family_free),

(font_family_convert), (peek_property_class), (expose_cb), (main):
Illustrate use of custom properties.

1 files changed, 156 insertions, 0 deletions

diff --git a/examples/example-4.c b/examples/example-4.c
new file mode 100644
index 0000000..5931629
--- /dev/null
+++ b/examples/example-4.c
@@ -0,0 +1,156 @@
+
+#include <stdlib.h>
+#include <cairo.h>
+#include <ccss/ccss.h>
+#include <gtk/gtk.h>
+
+static ccss_property_class_t const *
+peek_property_class (void);
+
+/*
+ * Custom property implementation start.
+ */
+
+typedef struct {
+	ccss_property_base_t	 base;
+	char			*font_family;
+} font_family_t;
+
+static ccss_property_base_t *
+font_family_new (CRTerm const *values)
+{
+	font_family_t *self;
+
+	g_return_val_if_fail (values, NULL);
+
+	self = NULL;
+
+	switch (values->type) {
+	case TERM_IDENT:
+	case TERM_STRING:
+		self = g_new0 (font_family_t, 1);
+		ccss_property_init ((ccss_property_base_t *) self, peek_property_class ());
+		self->font_family = g_strdup (cr_string_peek_raw_str (values->content.str));
+		break;
+	default:
+		/* Unhandled, fall thru. */
+		;
+	}
+
+	return (ccss_property_base_t *) self;
+}
+
+static void
+font_family_free (font_family_t *self)
+{
+	g_free (self->font_family);
+	g_free (self);
+}
+
+static bool
+font_family_convert (font_family_t const	*self,
+		     ccss_property_type_t	 target,
+		     void			*value)
+{
+	/* Only conversion to string is supported. */
+
+	if (CCSS_PROPERTY_TYPE_STRING == target) {
+		* (char **) value = g_strdup (self->font_family);
+		return true;
+	}
+
+	return false;
+}
+
+static ccss_property_class_t const _ptable[] = {
+    {
+	.name = "font-family",
+	.property_new = (ccss_property_new_f) font_family_new,
+	.property_free = (ccss_property_free_f) font_family_free,
+	.property_convert = (ccss_property_convert_f) font_family_convert,
+	.property_factory = NULL
+    }, {
+	.name = NULL
+    }
+};
+
+/*
+ * Custom property implementation end.
+ */
+
+static ccss_property_class_t const *
+peek_property_class (void)
+{
+	return &_ptable[0];
+}
+
+static gboolean
+expose_cb (GtkWidget		*widget,
+	   GdkEventExpose	*event,
+	   ccss_style_t const	*style)
+{
+	cairo_t			*cr;
+	font_family_t const	*font_family;
+	//PangoLayout*
+
+	cr = gdk_cairo_create (widget->window);
+
+	font_family = NULL;
+	ccss_style_get_property (style, "font-family", (void **) &font_family);
+	if (font_family) {
+		printf ("%s\n", font_family->font_family);
+	}
+
+	cairo_destroy (cr);
+
+	return FALSE;
+}
+
+static char const _css[] = "			\
+	box { 					\
+		font-family: Helvetica;		\
+	}					\
+";
+
+int
+main (int	  argc,
+      char	**argv)
+{
+	ccss_stylesheet_t	*stylesheet;
+	ccss_style_t		*style;
+	GtkWidget		*window;
+	gboolean		 ret;
+
+	gtk_init (&argc, &argv);
+	ccss_cairo_init ();
+	ccss_add_properties (_ptable);
+
+	stylesheet = ccss_stylesheet_new_from_buffer (_css, sizeof (_css));
+	/* stylesheet = ccss_stylesheet_new_from_file ("example-1.css"); */
+
+	style = ccss_style_new ();
+	ret = ccss_stylesheet_query_type (stylesheet, "box", style);
+	g_assert (ret);
+
+#ifdef CCSS_DEBUG
+	ccss_style_dump (style);
+#endif
+	window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+	gtk_window_set_default_size (GTK_WINDOW (window), 160, 90);
+	gtk_widget_set_app_paintable (window, TRUE);
+	g_signal_connect (G_OBJECT (window), "delete-event", 
+			  G_CALLBACK (gtk_main_quit), NULL);
+	g_signal_connect (G_OBJECT (window), "expose-event", 
+			  G_CALLBACK (expose_cb), style);
+
+	gtk_widget_show_all (window);
+	gtk_main ();
+
+	ccss_style_free (style);
+	ccss_stylesheet_free (stylesheet);
+
+	ccss_shutdown ();
+
+	return EXIT_SUCCESS;
+}
+