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Add signals for Backend options

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The ClutterBackend instance at the moment lacks the ability to
notify runtime changes of the font options and the resolution.

For this reason, this commit adds a ::resolution-changed and a
::font-changed signals to the Backend class.

The ::resolution-changed signal is emitted when set_resolution()
is called with a different DPI; ::font-changed is emitted when the
cairo_font_options_t* changes from the default.
This commit is contained in:
Emmanuele Bassi 2008-12-23 13:55:51 +00:00
parent b021f518c1
commit b8b8b155c4
2 changed files with 38 additions and 2 deletions
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36
clutter/clutter-backend.c
View File

@ -44,6 +44,7 @@
#include "clutter-backend.h"
#include "clutter-debug.h"
#include "clutter-fixed.h"
#include "clutter-marshal.h"
#include "clutter-private.h"
G_DEFINE_ABSTRACT_TYPE (ClutterBackend, clutter_backend, G_TYPE_OBJECT);
@ -62,6 +63,16 @@ struct _ClutterBackendPrivate
cairo_font_options_t *font_options;
};
enum
{
RESOLUTION_CHANGED,
FONT_CHANGED,
LAST_SIGNAL
};
static guint backend_signals[LAST_SIGNAL] = { 0, };
static void
clutter_backend_dispose (GObject *gobject)
{
@ -89,6 +100,24 @@ clutter_backend_class_init (ClutterBackendClass *klass)
gobject_class->dispose = clutter_backend_dispose;
g_type_class_add_private (gobject_class, sizeof (ClutterBackendPrivate));
backend_signals[RESOLUTION_CHANGED] =
g_signal_new (I_("resolution-changed"),
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (ClutterBackendClass, resolution_changed),
NULL, NULL,
clutter_marshal_VOID__VOID,
G_TYPE_NONE, 0);
backend_signals[FONT_CHANGED] =
g_signal_new (I_("font-changed"),
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (ClutterBackendClass, font_changed),
NULL, NULL,
clutter_marshal_VOID__VOID,
G_TYPE_NONE, 0);
}
static void
@ -388,8 +417,9 @@ clutter_backend_set_resolution (ClutterBackend *backend,
priv->resolution = fixed_dpi;
if (CLUTTER_CONTEXT ()->font_map)
cogl_pango_font_map_set_resolution (CLUTTER_CONTEXT ()->font_map,
COGL_FIXED_TO_FLOAT (fixed_dpi));
cogl_pango_font_map_set_resolution (CLUTTER_CONTEXT ()->font_map, dpi);
g_signal_emit (backend, backend_signals[RESOLUTION_CHANGED], 0);
}
/**
@ -445,6 +475,8 @@ clutter_backend_set_font_options (ClutterBackend *backend,
priv->font_options = cairo_font_options_copy (options);
else
priv->font_options = NULL;
g_signal_emit (backend, backend_signals[FONT_CHANGED], 0);
}
}

4
clutter/clutter-backend.h
View File

@ -77,6 +77,10 @@ struct _ClutterBackendClass
ClutterStage *stage);
void (* ensure_context) (ClutterBackend *backend,
ClutterStage *stage);
/* signals */
void (* resolution_changed) (ClutterBackend *backend);
void (* font_changed) (ClutterBackend *backend);
};
GType clutter_backend_get_type (void) G_GNUC_CONST;