logdiag/liblogdiag/ld-diagram-object.c

468 lines
11 KiB
C

/*
* ld-diagram-object.c
*
* This file is a part of logdiag.
* Copyright Přemysl Janouch 2010 - 2011. All rights reserved.
*
* See the file LICENSE for licensing information.
*
*/
#include <string.h>
#include "liblogdiag.h"
#include "config.h"
/**
* SECTION:ld-diagram-object
* @short_description: A diagram object
* @see_also: #LdDiagram, #LdCanvas
*
* #LdDiagramObject represents an object in an #LdDiagram.
*/
/*
* LdDiagramObjectPrivate:
* @storage: storage for object parameters.
*/
struct _LdDiagramObjectPrivate
{
JsonObject *storage;
};
typedef struct _SetParamActionData SetParamActionData;
/*
* SetParamActionData:
* @self: the object this action has happened on.
* @param_name: the name of the parameter that has been changed.
* @old_node: the old node.
* @new_node: the new node.
*/
struct _SetParamActionData
{
LdDiagramObject *self;
gchar *param_name;
JsonNode *old_node;
JsonNode *new_node;
};
enum
{
PROP_0,
PROP_STORAGE,
PROP_X,
PROP_Y
};
static void ld_diagram_object_get_property (GObject *object, guint property_id,
GValue *value, GParamSpec *pspec);
static void ld_diagram_object_set_property (GObject *object, guint property_id,
const GValue *value, GParamSpec *pspec);
static void ld_diagram_object_dispose (GObject *gobject);
static void on_set_param_undo (gpointer user_data);
static void on_set_param_redo (gpointer user_data);
static void on_set_param_destroy (gpointer user_data);
G_DEFINE_TYPE (LdDiagramObject, ld_diagram_object, G_TYPE_OBJECT);
static void
ld_diagram_object_class_init (LdDiagramObjectClass *klass)
{
GObjectClass *object_class;
GParamSpec *pspec;
object_class = G_OBJECT_CLASS (klass);
object_class->get_property = ld_diagram_object_get_property;
object_class->set_property = ld_diagram_object_set_property;
object_class->dispose = ld_diagram_object_dispose;
/**
* LdDiagramObject:storage:
*
* Storage for object parameters.
*/
pspec = g_param_spec_boxed ("storage", "Storage",
"Storage for object parameters.",
JSON_TYPE_OBJECT, G_PARAM_READWRITE);
g_object_class_install_property (object_class, PROP_STORAGE, pspec);
/**
* LdDiagramObject:x:
*
* The X coordinate of the object.
*/
pspec = g_param_spec_double ("x", "X",
"The X coordinate of this object.",
-G_MAXDOUBLE, G_MAXDOUBLE, 0, G_PARAM_READWRITE);
g_object_class_install_property (object_class, PROP_X, pspec);
/**
* LdDiagramObject:y:
*
* The Y coordinate of the object.
*/
pspec = g_param_spec_double ("y", "Y",
"The Y coordinate of this object.",
-G_MAXDOUBLE, G_MAXDOUBLE, 0, G_PARAM_READWRITE);
g_object_class_install_property (object_class, PROP_Y, pspec);
/**
* LdDiagramObject::changed:
* @self: an #LdDiagramObject object.
* @action: an #LdUndoAction object.
*
* The object has been changed.
*/
klass->changed_signal = g_signal_new
("changed", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, 0, NULL, NULL,
g_cclosure_marshal_VOID__OBJECT,
G_TYPE_NONE, 1, LD_TYPE_UNDO_ACTION);
g_type_class_add_private (klass, sizeof (LdDiagramObjectPrivate));
}
static void
ld_diagram_object_init (LdDiagramObject *self)
{
self->priv = G_TYPE_INSTANCE_GET_PRIVATE
(self, LD_TYPE_DIAGRAM_OBJECT, LdDiagramObjectPrivate);
}
static void
ld_diagram_object_get_property (GObject *object, guint property_id,
GValue *value, GParamSpec *pspec)
{
LdDiagramObject *self;
self = LD_DIAGRAM_OBJECT (object);
switch (property_id)
{
case PROP_STORAGE:
g_value_set_boxed (value, ld_diagram_object_get_storage (self));
break;
case PROP_X:
case PROP_Y:
ld_diagram_object_get_data_for_param (self, value, pspec);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
ld_diagram_object_set_property (GObject *object, guint property_id,
const GValue *value, GParamSpec *pspec)
{
LdDiagramObject *self;
self = LD_DIAGRAM_OBJECT (object);
switch (property_id)
{
case PROP_STORAGE:
ld_diagram_object_set_storage (self, g_value_get_boxed (value));
break;
case PROP_X:
case PROP_Y:
ld_diagram_object_set_data_for_param (self, value, pspec);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
ld_diagram_object_dispose (GObject *gobject)
{
LdDiagramObject *self;
self = LD_DIAGRAM_OBJECT (gobject);
if (self->priv->storage)
{
json_object_unref (self->priv->storage);
self->priv->storage = NULL;
}
/* Chain up to the parent class. */
G_OBJECT_CLASS (ld_diagram_object_parent_class)->dispose (gobject);
}
/**
* ld_diagram_object_new:
* @storage: a storage backend.
*
* Return value: a new #LdDiagramObject object.
*/
LdDiagramObject *
ld_diagram_object_new (JsonObject *storage)
{
LdDiagramObject *self;
self = g_object_new (LD_TYPE_DIAGRAM_OBJECT, "storage", storage, NULL);
return self;
}
/**
* ld_diagram_object_get_storage:
* @self: an #LdDiagramObject object.
*
* Get the storage for object parameters.
*
* Return value: (transfer none): a #JsonObject boxed type.
*/
JsonObject *
ld_diagram_object_get_storage (LdDiagramObject *self)
{
g_return_val_if_fail (LD_IS_DIAGRAM_OBJECT (self), NULL);
if (!self->priv->storage)
self->priv->storage = json_object_new ();
return self->priv->storage;
}
/**
* ld_diagram_object_set_storage:
* @self: an #LdDiagramObject object.
* @storage: (transfer none): a #JsonObject boxed type.
*
* Set the storage for object parameters.
*/
void
ld_diagram_object_set_storage (LdDiagramObject *self, JsonObject *storage)
{
g_return_if_fail (LD_IS_DIAGRAM_OBJECT (self));
if (self->priv->storage)
json_object_unref (self->priv->storage);
if (storage)
self->priv->storage = json_object_ref (storage);
else
self->priv->storage = NULL;
}
/**
* ld_diagram_object_changed:
* @self: an #LdDiagramObject object.
* @action: an #LdUndoAction object specifying the change.
*
* Emit the #LdDiagramObject::changed signal.
*/
void
ld_diagram_object_changed (LdDiagramObject *self, LdUndoAction *action)
{
g_return_if_fail (LD_IS_DIAGRAM_OBJECT (self));
g_return_if_fail (LD_IS_UNDO_ACTION (action));
g_signal_emit (self, LD_DIAGRAM_OBJECT_GET_CLASS (self)->changed_signal, 0,
action);
}
/**
* ld_diagram_object_get_data_for_param:
* @self: an #LdDiagramObject object.
* @data: (out): where the data will be stored.
* @pspec: the parameter to read data for. This must be a property of @self.
*
* Retrieve data for a parameter from internal storage. If there's no data
* corresponding to this parameter, the value is set to the default.
* This method invokes ld_diagram_object_changed().
*/
void
ld_diagram_object_get_data_for_param (LdDiagramObject *self,
GValue *data, GParamSpec *pspec)
{
JsonObject *storage;
JsonNode *node;
const gchar *name;
GValue json_value;
gboolean result;
g_return_if_fail (LD_IS_DIAGRAM_OBJECT (self));
g_return_if_fail (G_IS_VALUE (data));
g_return_if_fail (G_IS_PARAM_SPEC (pspec));
storage = ld_diagram_object_get_storage (self);
name = g_param_spec_get_name (pspec);
node = json_object_get_member (storage, name);
if (!node || json_node_is_null (node))
goto ld_diagram_object_get_data_default;
if (!JSON_NODE_HOLDS_VALUE (node))
goto ld_diagram_object_get_data_warn;
memset (&json_value, 0, sizeof (json_value));
json_node_get_value (node, &json_value);
result = g_param_value_convert (pspec, &json_value, data, FALSE);
g_value_unset (&json_value);
if (result)
return;
ld_diagram_object_get_data_warn:
g_warning ("%s: unable to get parameter `%s' of type `%s'"
" from node of type `%s'; setting the parameter to it's default value",
G_STRFUNC, name, G_PARAM_SPEC_TYPE_NAME (pspec),
json_node_type_name (node));
ld_diagram_object_get_data_default:
g_param_value_set_default (pspec, data);
g_object_set_property (G_OBJECT (self), name, data);
}
/* We have to remove it first due to a bug in json-glib. */
#define json_object_set_member(object, name, node) \
G_STMT_START \
{ \
json_object_remove_member (object, name); \
json_object_set_member (object, name, node); \
} \
G_STMT_END
/**
* ld_diagram_object_set_data_for_param:
* @self: an #LdDiagramObject object.
* @data: the data.
* @pspec: the parameter to put data for.
*
* Put data for a parameter into internal storage.
*/
void
ld_diagram_object_set_data_for_param (LdDiagramObject *self,
const GValue *data, GParamSpec *pspec)
{
LdUndoAction *action;
SetParamActionData *action_data;
JsonObject *storage;
const gchar *name;
JsonNode *node;
g_return_if_fail (LD_IS_DIAGRAM_OBJECT (self));
g_return_if_fail (G_IS_VALUE (data));
g_return_if_fail (G_IS_PARAM_SPEC (pspec));
storage = ld_diagram_object_get_storage (self);
name = g_param_spec_get_name (pspec);
action_data = g_slice_new (SetParamActionData);
action_data->self = g_object_ref (self);
action_data->param_name = g_strdup (g_param_spec_get_name (pspec));
node = json_object_get_member (storage, name);
action_data->old_node = node ? json_node_copy (node) : NULL;
node = json_node_new (JSON_NODE_VALUE);
json_node_set_value (node, data);
action_data->new_node = json_node_copy (node);
json_object_set_member (storage, name, node);
action = ld_undo_action_new (on_set_param_undo, on_set_param_redo,
on_set_param_destroy, action_data);
ld_diagram_object_changed (self, action);
g_object_unref (action);
}
static void
on_set_param_undo (gpointer user_data)
{
SetParamActionData *data;
JsonObject *storage;
data = user_data;
storage = ld_diagram_object_get_storage (data->self);
json_object_set_member (storage, data->param_name,
json_node_copy (data->old_node));
}
static void
on_set_param_redo (gpointer user_data)
{
SetParamActionData *data;
JsonObject *storage;
data = user_data;
storage = ld_diagram_object_get_storage (data->self);
json_object_set_member (storage, data->param_name,
json_node_copy (data->new_node));
}
static void
on_set_param_destroy (gpointer user_data)
{
SetParamActionData *data;
data = user_data;
g_object_unref (data->self);
g_free (data->param_name);
if (data->old_node)
json_node_free (data->old_node);
if (data->new_node)
json_node_free (data->new_node);
g_slice_free (SetParamActionData, data);
}
/**
* ld_diagram_object_get_x:
* @self: an #LdDiagramObject object.
*
* Return value: the X coordinate of the object.
*/
gdouble
ld_diagram_object_get_x (LdDiagramObject *self)
{
gdouble x;
g_return_val_if_fail (LD_IS_DIAGRAM_OBJECT (self), 0);
g_object_get (self, "x", &x, NULL);
return x;
}
/**
* ld_diagram_object_get_y:
* @self: an #LdDiagramObject object.
*
* Return value: the Y coordinate of the object.
*/
gdouble
ld_diagram_object_get_y (LdDiagramObject *self)
{
gdouble y;
g_return_val_if_fail (LD_IS_DIAGRAM_OBJECT (self), 0);
g_object_get (self, "y", &y, NULL);
return y;
}
/**
* ld_diagram_object_set_x:
* @self: an #LdDiagramObject object.
* @x: the new X coordinate.
*
* Set the X coordinate of the object.
*/
void
ld_diagram_object_set_x (LdDiagramObject *self, gdouble x)
{
g_return_if_fail (LD_IS_DIAGRAM_OBJECT (self));
g_object_set (self, "x", x, NULL);
}
/**
* ld_diagram_object_set_y:
* @self: an #LdDiagramObject object.
* @y: the new Y coordinate.
*
* Set the Y coordinate of the object.
*/
void
ld_diagram_object_set_y (LdDiagramObject *self, gdouble y)
{
g_return_if_fail (LD_IS_DIAGRAM_OBJECT (self));
g_object_set (self, "y", y, NULL);
}