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expression: Add the ability to watch an expression

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This commit is contained in:
Benjamin Otte
2019-11-21 05:53:56 +01:00
parent b603f472ab
commit e8613aab9c
2 changed files with 588 additions and 3 deletions
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570
gtk/gtkexpression.c
View File

@@ -99,15 +99,37 @@ struct _GtkExpression
GtkExpression *owner;
};
typedef struct _GtkExpressionSubWatch GtkExpressionSubWatch;
struct _GtkExpressionWatch
{
GtkExpression *expression;
GObject *this;
GDestroyNotify user_destroy;
GtkExpressionNotify notify;
gpointer user_data;
guchar sub[0];
};
struct _GtkExpressionClass
{
gsize struct_size;
const char *type_name;
void (* finalize) (GtkExpression *expr);
gboolean (* is_static) (GtkExpression *expr);
gboolean (* evaluate) (GtkExpression *expr,
gpointer this,
GValue *value);
gsize (* watch_size) (GtkExpression *expr);
void (* watch) (GtkExpression *self,
GtkExpressionSubWatch *watch,
gpointer this_,
GtkExpressionNotify notify,
gpointer user_data);
void (* unwatch) (GtkExpression *self,
GtkExpressionSubWatch *watch);
};
/**
@@ -143,6 +165,50 @@ gtk_expression_alloc (const GtkExpressionClass *expression_class,
return self;
}
static gsize
gtk_expression_watch_size_static (GtkExpression *self)
{
return 0;
}
static void
gtk_expression_watch_static (GtkExpression *self,
GtkExpressionSubWatch *watch,
gpointer this_,
GtkExpressionNotify notify,
gpointer user_data)
{
}
static void
gtk_expression_unwatch_static (GtkExpression *self,
GtkExpressionSubWatch *watch)
{
}
static gsize
gtk_expression_watch_size (GtkExpression *self)
{
return self->expression_class->watch_size (self);
}
static void
gtk_expression_subwatch_init (GtkExpression *self,
GtkExpressionSubWatch *watch,
gpointer this,
GtkExpressionNotify notify,
gpointer user_data)
{
self->expression_class->watch (self, watch, this, notify, user_data);
}
static void
gtk_expression_subwatch_finish (GtkExpression *self,
GtkExpressionSubWatch *watch)
{
self->expression_class->unwatch (self, watch);
}
/*** CONSTANT ***/
typedef struct _GtkConstantExpression GtkConstantExpression;
@@ -162,6 +228,12 @@ gtk_constant_expression_finalize (GtkExpression *expr)
g_value_unset (&self->value);
}
static gboolean
gtk_constant_expression_is_static (GtkExpression *expr)
{
return TRUE;
}
static gboolean
gtk_constant_expression_evaluate (GtkExpression *expr,
gpointer this,
@@ -179,7 +251,11 @@ static const GtkExpressionClass GTK_CONSTANT_EXPRESSION_CLASS =
sizeof (GtkConstantExpression),
"GtkConstantExpression",
gtk_constant_expression_finalize,
gtk_constant_expression_is_static,
gtk_constant_expression_evaluate,
gtk_expression_watch_size_static,
gtk_expression_watch_static,
gtk_expression_unwatch_static
};
/**
@@ -249,12 +325,20 @@ gtk_constant_expression_new_for_value (const GValue *value)
/*** OBJECT ***/
typedef struct _GtkObjectExpression GtkObjectExpression;
typedef struct _GtkObjectExpressionWatch GtkObjectExpressionWatch;
struct _GtkObjectExpression
{
GtkExpression parent;
GObject *object;
GSList *watches;
};
struct _GtkObjectExpressionWatch
{
GtkExpressionNotify notify;
gpointer user_data;
};
static void
@@ -262,8 +346,16 @@ gtk_object_expression_weak_ref_cb (gpointer data,
GObject *object)
{
GtkObjectExpression *self = (GtkObjectExpression *) data;
GSList *l;
self->object = NULL;
for (l = self->watches; l; l = l->next)
{
GtkObjectExpressionWatch *owatch = l->data;
owatch->notify (owatch->user_data);
}
}
static void
@@ -273,6 +365,14 @@ gtk_object_expression_finalize (GtkExpression *expr)
if (self->object)
g_object_weak_unref (self->object, gtk_object_expression_weak_ref_cb, self);
g_assert (self->watches == NULL);
}
static gboolean
gtk_object_expression_is_static (GtkExpression *expr)
{
return FALSE;
}
static gboolean
@@ -290,12 +390,46 @@ gtk_object_expression_evaluate (GtkExpression *expr,
return TRUE;
}
static gsize
gtk_object_expression_watch_size (GtkExpression *expr)
{
return sizeof (GtkObjectExpressionWatch);
}
static void
gtk_object_expression_watch (GtkExpression *expr,
GtkExpressionSubWatch *watch,
gpointer this_,
GtkExpressionNotify notify,
gpointer user_data)
{
GtkObjectExpression *self = (GtkObjectExpression *) expr;
GtkObjectExpressionWatch *owatch = (GtkObjectExpressionWatch *) watch;
owatch->notify = notify;
owatch->user_data = user_data;
self->watches = g_slist_prepend (self->watches, owatch);
}
static void
gtk_object_expression_unwatch (GtkExpression *expr,
GtkExpressionSubWatch *watch)
{
GtkObjectExpression *self = (GtkObjectExpression *) expr;
self->watches = g_slist_remove (self->watches, watch);
}
static const GtkExpressionClass GTK_OBJECT_EXPRESSION_CLASS =
{
sizeof (GtkObjectExpression),
"GtkObjectExpression",
gtk_object_expression_finalize,
gtk_object_expression_evaluate
gtk_object_expression_is_static,
gtk_object_expression_evaluate,
gtk_object_expression_watch_size,
gtk_object_expression_watch,
gtk_object_expression_unwatch
};
/**
@@ -346,6 +480,12 @@ gtk_property_expression_finalize (GtkExpression *expr)
g_clear_pointer (&self->expr, gtk_expression_unref);
}
static gboolean
gtk_property_expression_is_static (GtkExpression *expr)
{
return FALSE;
}
static GObject *
gtk_property_expression_get_object (GtkPropertyExpression *self,
gpointer this)
@@ -372,6 +512,8 @@ gtk_property_expression_get_object (GtkPropertyExpression *self,
object = g_value_dup_object (&expr_value);
g_value_unset (&expr_value);
if (object == NULL)
return NULL;
if (!G_TYPE_CHECK_INSTANCE_TYPE (object, self->pspec->owner_type))
{
@@ -399,12 +541,132 @@ gtk_property_expression_evaluate (GtkExpression *expr,
return TRUE;
}
typedef struct _GtkPropertyExpressionWatch GtkPropertyExpressionWatch;
struct _GtkPropertyExpressionWatch
{
GtkExpressionNotify notify;
gpointer user_data;
GtkPropertyExpression *expr;
gpointer this;
GClosure *closure;
guchar sub[0];
};
static void
gtk_property_expression_watch_destroy_closure (GtkPropertyExpressionWatch *pwatch)
{
if (pwatch->closure == NULL)
return;
g_closure_invalidate (pwatch->closure);
g_closure_unref (pwatch->closure);
pwatch->closure = NULL;
}
static void
gtk_property_expression_watch_notify_cb (GObject *object,
GParamSpec *pspec,
GtkPropertyExpressionWatch *pwatch)
{
pwatch->notify (pwatch->user_data);
}
static void
gtk_property_expression_watch_create_closure (GtkPropertyExpressionWatch *pwatch)
{
GObject *object;
object = gtk_property_expression_get_object (pwatch->expr, pwatch->this);
if (object == NULL)
return;
pwatch->closure = g_cclosure_new (G_CALLBACK (gtk_property_expression_watch_notify_cb), pwatch, NULL);
if (!g_signal_connect_closure_by_id (object,
g_signal_lookup ("notify", G_OBJECT_TYPE (object)),
g_quark_from_string (pwatch->expr->pspec->name),
g_closure_ref (pwatch->closure),
FALSE))
{
g_assert_not_reached ();
}
g_object_unref (object);
}
static void
gtk_property_expression_watch_expr_notify_cb (gpointer data)
{
GtkPropertyExpressionWatch *pwatch = data;
gtk_property_expression_watch_destroy_closure (pwatch);
gtk_property_expression_watch_create_closure (pwatch);
pwatch->notify (pwatch->user_data);
}
static gsize
gtk_property_expression_watch_size (GtkExpression *expr)
{
GtkPropertyExpression *self = (GtkPropertyExpression *) expr;
gsize result;
result = sizeof (GtkPropertyExpressionWatch);
if (self->expr)
result += gtk_expression_watch_size (self->expr);
return result;
}
static void
gtk_property_expression_watch (GtkExpression *expr,
GtkExpressionSubWatch *watch,
gpointer this_,
GtkExpressionNotify notify,
gpointer user_data)
{
GtkPropertyExpressionWatch *pwatch = (GtkPropertyExpressionWatch *) watch;
GtkPropertyExpression *self = (GtkPropertyExpression *) expr;
pwatch->notify = notify;
pwatch->user_data = user_data;
pwatch->expr = self;
pwatch->this = this_;
if (self->expr && !gtk_expression_is_static (self->expr))
{
gtk_expression_subwatch_init (self->expr,
(GtkExpressionSubWatch *) pwatch->sub,
this_,
gtk_property_expression_watch_expr_notify_cb,
pwatch);
}
gtk_property_expression_watch_create_closure (pwatch);
}
static void
gtk_property_expression_unwatch (GtkExpression *expr,
GtkExpressionSubWatch *watch)
{
GtkPropertyExpressionWatch *pwatch = (GtkPropertyExpressionWatch *) watch;
GtkPropertyExpression *self = (GtkPropertyExpression *) expr;
gtk_property_expression_watch_destroy_closure (pwatch);
if (self->expr && !gtk_expression_is_static (self->expr))
gtk_expression_subwatch_finish (self->expr, (GtkExpressionSubWatch *) pwatch->sub);
}
static const GtkExpressionClass GTK_PROPERTY_EXPRESSION_CLASS =
{
sizeof (GtkPropertyExpression),
"GtkPropertyExpression",
gtk_property_expression_finalize,
gtk_property_expression_is_static,
gtk_property_expression_evaluate,
gtk_property_expression_watch_size,
gtk_property_expression_watch,
gtk_property_expression_unwatch
};
/**
@@ -437,11 +699,15 @@ gtk_property_expression_new (GType this_type,
if (g_type_is_a (this_type, G_TYPE_OBJECT))
{
pspec = g_object_class_find_property (g_type_class_peek (this_type), property_name);
GObjectClass *class = g_type_class_ref (this_type);
pspec = g_object_class_find_property (class, property_name);
g_type_class_unref (class);
}
else if (g_type_is_a (this_type, G_TYPE_INTERFACE))
{
pspec = g_object_interface_find_property (g_type_default_interface_peek (this_type), property_name);
GTypeInterface *iface = g_type_default_interface_ref (this_type);
pspec = g_object_interface_find_property (iface, property_name);
g_type_default_interface_unref (iface);
}
else
{
@@ -491,6 +757,21 @@ gtk_closure_expression_finalize (GtkExpression *expr)
g_closure_unref (self->closure);
}
static gboolean
gtk_closure_expression_is_static (GtkExpression *expr)
{
GtkClosureExpression *self = (GtkClosureExpression *) expr;
guint i;
for (i = 0; i < self->n_params; i++)
{
if (!gtk_expression_is_static (self->params[i]))
return FALSE;
}
return TRUE;
}
static gboolean
gtk_closure_expression_evaluate (GtkExpression *expr,
gpointer this,
@@ -531,12 +812,104 @@ out:
return result;
}
typedef struct _GtkClosureExpressionWatch GtkClosureExpressionWatch;
struct _GtkClosureExpressionWatch
{
GtkExpressionNotify notify;
gpointer user_data;
guchar sub[0];
};
static void
gtk_closure_expression_watch_notify_cb (gpointer data)
{
GtkClosureExpressionWatch *cwatch = data;
cwatch->notify (cwatch->user_data);
}
static gsize
gtk_closure_expression_watch_size (GtkExpression *expr)
{
GtkClosureExpression *self = (GtkClosureExpression *) expr;
gsize size;
guint i;
size = sizeof (GtkClosureExpressionWatch);
for (i = 0; i < self->n_params; i++)
{
if (gtk_expression_is_static (self->params[i]))
continue;
size += gtk_expression_watch_size (self->params[i]);
}
return size;
}
static void
gtk_closure_expression_watch (GtkExpression *expr,
GtkExpressionSubWatch *watch,
gpointer this_,
GtkExpressionNotify notify,
gpointer user_data)
{
GtkClosureExpressionWatch *cwatch = (GtkClosureExpressionWatch *) watch;
GtkClosureExpression *self = (GtkClosureExpression *) expr;
guchar *sub;
guint i;
cwatch->notify = notify;
cwatch->user_data = user_data;
sub = cwatch->sub;
for (i = 0; i < self->n_params; i++)
{
if (gtk_expression_is_static (self->params[i]))
continue;
gtk_expression_subwatch_init (self->params[i],
(GtkExpressionSubWatch *) sub,
this_,
gtk_closure_expression_watch_notify_cb,
watch);
sub += gtk_expression_watch_size (self->params[i]);
}
}
static void
gtk_closure_expression_unwatch (GtkExpression *expr,
GtkExpressionSubWatch *watch)
{
GtkClosureExpressionWatch *cwatch = (GtkClosureExpressionWatch *) watch;
GtkClosureExpression *self = (GtkClosureExpression *) expr;
guchar *sub;
guint i;
sub = cwatch->sub;
for (i = 0; i < self->n_params; i++)
{
if (gtk_expression_is_static (self->params[i]))
continue;
gtk_expression_subwatch_finish (self->params[i],
(GtkExpressionSubWatch *) sub);
sub += gtk_expression_watch_size (self->params[i]);
}
}
static const GtkExpressionClass GTK_CLOSURE_EXPRESSION_CLASS =
{
sizeof (GtkClosureExpression),
"GtkClosureExpression",
gtk_closure_expression_finalize,
gtk_closure_expression_is_static,
gtk_closure_expression_evaluate,
gtk_closure_expression_watch_size,
gtk_closure_expression_watch,
gtk_closure_expression_unwatch
};
/**
@@ -696,3 +1069,194 @@ gtk_expression_evaluate (GtkExpression *self,
return self->expression_class->evaluate (self, this_, value);
}
/**
* gtk_expression_is_static:
* @self: a #GtkExpression
*
* Checks if the expression is static.
*
* A static expression will never change its result when
* gtk_expression_evaluate() is called on it with the same arguments.
*
* That means a call to gtk_expression_watch() is not necessary because
* it will never trigger a notify.
*
* Returns: %TRUE if the expression is static
**/
gboolean
gtk_expression_is_static (GtkExpression *self)
{
return self->expression_class->is_static (self);
}
static gboolean
gtk_expression_watch_is_watching (GtkExpressionWatch *watch)
{
return watch->expression != NULL;
}
static void
gtk_expression_watch_this_cb (gpointer data,
GObject *this)
{
GtkExpressionWatch *watch = data;
watch->this = NULL;
watch->notify (watch->user_data);
gtk_expression_watch_unwatch (watch);
}
static void
gtk_expression_watch_cb (gpointer data)
{
GtkExpressionWatch *watch = data;
if (!gtk_expression_watch_is_watching (watch))
return;
watch->notify (watch->user_data);
}
/**
* gtk_expression_watch:
* @self: a #GtkExpression
* @this_: (transfer none) (type GObject) (nullable): the this argument to
* watch
* @notify: (closure user_data): callback to invoke when the
* expression changes
* @user_data: user data to pass to @notify callback
* @user_destroy: destroy notify for @user_data
*
* Installs a watch for the given @expression that calls the @notify function
* whenever the evaluation of @self may have changed.
*
* GTK cannot guarantee that the evaluation did indeed change when the @notify
* gets invoked, but it guarantees the opposite: When it did in fact change,
* the @notify will be invoked.
*
* Returns: (transfer none): The newly installed watch. Note that the only
* reference held to the watch will be released when the watch is unwatched
* which can happen automatically, and not just via
* gtk_expression_watch_unwatch(). You should call gtk_expression_watch_ref()
* if you want to keep the watch around.
**/
GtkExpressionWatch *
gtk_expression_watch (GtkExpression *self,
gpointer this_,
GtkExpressionNotify notify,
gpointer user_data,
GDestroyNotify user_destroy)
{
GtkExpressionWatch *watch;
g_return_val_if_fail (self != NULL, NULL);
g_return_val_if_fail (this_ == NULL || G_IS_OBJECT (this_), NULL);
g_return_val_if_fail (notify != NULL, NULL);
watch = g_atomic_rc_box_alloc0 (sizeof (GtkExpressionWatch) + gtk_expression_watch_size (self));
watch->expression = gtk_expression_ref (self);
watch->this = this_;
if (this_)
g_object_weak_ref (this_, gtk_expression_watch_this_cb, watch);
watch->notify = notify;
watch->user_data = user_data;
watch->user_destroy = user_destroy;
gtk_expression_subwatch_init (self,
(GtkExpressionSubWatch *) watch->sub,
this_,
gtk_expression_watch_cb,
watch);
return watch;
}
/**
* gtk_expression_watch_ref:
* @self: (allow-none): a #GtkExpressionWatch
*
* Acquires a reference on the given #GtkExpressionWatch.
*
* Returns: (transfer none): the #GtkExpression with an additional reference
*/
GtkExpressionWatch *
gtk_expression_watch_ref (GtkExpressionWatch *self)
{
return g_atomic_rc_box_acquire (self);
}
static void
gtk_expression_watch_finalize (gpointer data)
{
GtkExpressionWatch *watch = data;
g_assert (!gtk_expression_watch_is_watching (watch));
}
/**
* gtk_expression_watch_unref:
* @self: (allow-none): a #GtkExpressionWatch
*
* Releases a reference on the given #GtkExpressionWatch.
*
* If the reference was the last, the resources associated to @self are
* freed.
*/
void
gtk_expression_watch_unref (GtkExpressionWatch *self)
{
g_atomic_rc_box_release_full (self, gtk_expression_watch_finalize);
}
/**
* gtk_expression_watch_unwatch:
* @watch: (transfer none): watch to release
*
* Stops watching an expression that was established via gtk_expression_watch().
**/
void
gtk_expression_watch_unwatch (GtkExpressionWatch *watch)
{
if (!gtk_expression_watch_is_watching (watch))
return;
gtk_expression_subwatch_finish (watch->expression, (GtkExpressionSubWatch *) watch->sub);
if (watch->this)
g_object_weak_unref (watch->this, gtk_expression_watch_this_cb, watch);
if (watch->user_destroy)
watch->user_destroy (watch->user_data);
g_clear_pointer (&watch->expression, gtk_expression_unref);
gtk_expression_watch_unref (watch);
}
/**
* gtk_expression_watch_evaluate:
* @watch: a #GtkExpressionWatch
* @value: an empty #GValue to be set
*
* Evaluates the watched expression and on success stores the result
* in @value.
*
* This is equivalent to calling gtk_expression_evaluate() with the
* expression and this pointer originally used to create @watch.
*
* Returns: %TRUE if the expression could be evaluated and @value was set
**/
gboolean
gtk_expression_watch_evaluate (GtkExpressionWatch *watch,
GValue *value)
{
g_return_val_if_fail (watch != NULL, FALSE);
if (!gtk_expression_watch_is_watching (watch))
return FALSE;
return gtk_expression_evaluate (watch->expression, watch->this, value);
}

21
gtk/gtkexpression.h
View File

@@ -26,6 +26,9 @@
G_BEGIN_DECLS
typedef struct _GtkExpression GtkExpression;
typedef struct _GtkExpressionWatch GtkExpressionWatch;
typedef void (* GtkExpressionNotify) (gpointer user_data);
#define GTK_IS_EXPRESSION(expr) ((expr) != NULL)
@@ -42,9 +45,27 @@ void gtk_expression_unref (GtkExpression
GDK_AVAILABLE_IN_ALL
GType gtk_expression_get_value_type (GtkExpression *self);
GDK_AVAILABLE_IN_ALL
gboolean gtk_expression_is_static (GtkExpression *self);
GDK_AVAILABLE_IN_ALL
gboolean gtk_expression_evaluate (GtkExpression *self,
gpointer this_,
GValue *value);
GDK_AVAILABLE_IN_ALL
GtkExpressionWatch * gtk_expression_watch (GtkExpression *self,
gpointer this_,
GtkExpressionNotify notify,
gpointer user_data,
GDestroyNotify user_destroy);
GDK_AVAILABLE_IN_ALL
GtkExpressionWatch * gtk_expression_watch_ref (GtkExpressionWatch *watch);
GDK_AVAILABLE_IN_ALL
void gtk_expression_watch_unref (GtkExpressionWatch *watch);
GDK_AVAILABLE_IN_ALL
gboolean gtk_expression_watch_evaluate (GtkExpressionWatch *watch,
GValue *value);
GDK_AVAILABLE_IN_ALL
void gtk_expression_watch_unwatch (GtkExpressionWatch *watch);
GDK_AVAILABLE_IN_ALL
GtkExpression * gtk_property_expression_new (GType this_type,