logdiag/liblogdiag/ld-diagram.c

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/*
* ld-diagram.c
*
* This file is a part of logdiag.
* Copyright 2010, 2011, 2012 Přemysl Eric Janouch
*
* See the file LICENSE for licensing information.
*
*/
#include "liblogdiag.h"
#include "config.h"
/**
* SECTION:ld-diagram
* @short_description: A model for diagrams
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* @see_also: #LdDiagramView
*
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* #LdDiagram is a model used for storing diagrams.
*/
/*
* LdDiagramPrivate:
* @modified: whether the diagram has been modified.
* @lock_history: whether the history stacks are currently locked.
* @in_user_action: how many times a user action has been initiated.
* @undo_stack: a stack of actions that can be undone,
* each containing a #GList of #LdUndoAction subactions.
* @redo_stack: a stack of undone actions that can be redone,
* each containing a #GList of #LdUndoAction subactions.
* @objects: all objects in the diagram.
* @selection: all currently selected objects.
*/
struct _LdDiagramPrivate
{
gboolean modified;
gboolean lock_history;
guint in_user_action;
GList *undo_stack;
GList *redo_stack;
GList *objects;
GList *selection;
};
typedef struct _ObjectActionData ObjectActionData;
/*
* ObjectActionData:
* @self: an #LdDiagram object.
* @object: an #LdDiagramObject object.
* @pos: the position at which the object has been inserted or removed.
*/
struct _ObjectActionData
{
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gpointer self;
LdDiagramObject *object;
gint pos;
};
enum
{
PROP_0,
PROP_MODIFIED,
PROP_CAN_UNDO,
PROP_CAN_REDO
};
static void ld_diagram_get_property (GObject *object, guint property_id,
GValue *value, GParamSpec *pspec);
static void ld_diagram_set_property (GObject *object, guint property_id,
const GValue *value, GParamSpec *pspec);
static void ld_diagram_dispose (GObject *gobject);
static void ld_diagram_finalize (GObject *gobject);
static void ld_diagram_real_changed (LdDiagram *self);
static void ld_diagram_clear_internal (LdDiagram *self, gboolean emit_signals);
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static gboolean write_signature (GOutputStream *stream, GError **error);
static gboolean check_node (JsonNode *node, JsonNodeType type,
const gchar *id, GError **error);
static gboolean deserialize_diagram (LdDiagram *self, JsonNode *root,
GError **error);
static LdDiagramObject *deserialize_object (JsonObject *object_storage);
static JsonNode *serialize_diagram (LdDiagram *self);
static JsonNode *serialize_object (LdDiagramObject *object);
static const gchar *get_object_class_string (GType type);
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static void push_undo_action (LdDiagram *self, LdUndoAction *action);
static void destroy_action_stack (GList **stack);
static void on_object_changed (LdDiagramObject *object,
LdUndoAction *action, gpointer user_data);
static void on_object_notify_storage (LdDiagramObject *object,
GParamSpec *pspec, gpointer user_data);
static void on_object_action_insert (gpointer user_data);
static void on_object_action_remove (gpointer user_data);
static void on_object_action_destroy (gpointer user_data);
static void install_object (LdDiagramObject *object, LdDiagram *self);
static void uninstall_object (LdDiagramObject *object, LdDiagram *self);
static void ld_diagram_unselect_all_internal (LdDiagram *self);
G_DEFINE_TYPE (LdDiagram, ld_diagram, G_TYPE_OBJECT);
static void
ld_diagram_class_init (LdDiagramClass *klass)
{
GObjectClass *object_class;
GParamSpec *pspec;
object_class = G_OBJECT_CLASS (klass);
object_class->get_property = ld_diagram_get_property;
object_class->set_property = ld_diagram_set_property;
object_class->dispose = ld_diagram_dispose;
object_class->finalize = ld_diagram_finalize;
klass->changed = ld_diagram_real_changed;
/**
* LdDiagram:modified:
*
* Whether the diagram has been modified.
*/
pspec = g_param_spec_boolean ("modified", "Modified",
"Whether the diagram has been modified.",
FALSE, G_PARAM_READWRITE);
g_object_class_install_property (object_class, PROP_MODIFIED, pspec);
/**
* LdDiagram:can-undo:
*
* Whether any action can be undone.
*/
pspec = g_param_spec_boolean ("can-undo", "Can undo",
"Whether any action can be undone.",
FALSE, G_PARAM_READABLE);
g_object_class_install_property (object_class, PROP_CAN_UNDO, pspec);
/**
* LdDiagram:can-redo:
*
* Whether any undone action can be redone.
*/
pspec = g_param_spec_boolean ("can-redo", "Can redo",
"Whether any undone action can be redone.",
FALSE, G_PARAM_READABLE);
g_object_class_install_property (object_class, PROP_CAN_REDO, pspec);
/**
* LdDiagram::changed:
* @self: an #LdDiagram object.
*
* Contents of the diagram have changed.
*/
klass->changed_signal = g_signal_new
("changed", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (LdDiagramClass, changed), NULL, NULL,
g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
/**
* LdDiagram::selection-changed:
* @self: an #LdDiagram object.
*
* The current selection has changed.
*/
klass->selection_changed_signal = g_signal_new
("selection-changed", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (LdDiagramClass, selection_changed), NULL, NULL,
g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
g_type_class_add_private (klass, sizeof (LdDiagramPrivate));
}
static void
ld_diagram_init (LdDiagram *self)
{
self->priv = G_TYPE_INSTANCE_GET_PRIVATE
(self, LD_TYPE_DIAGRAM, LdDiagramPrivate);
}
static void
ld_diagram_get_property (GObject *object, guint property_id,
GValue *value, GParamSpec *pspec)
{
LdDiagram *self;
self = LD_DIAGRAM (object);
switch (property_id)
{
case PROP_MODIFIED:
g_value_set_boolean (value, ld_diagram_get_modified (self));
break;
case PROP_CAN_UNDO:
g_value_set_boolean (value, ld_diagram_can_undo (self));
break;
case PROP_CAN_REDO:
g_value_set_boolean (value, ld_diagram_can_redo (self));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
ld_diagram_set_property (GObject *object, guint property_id,
const GValue *value, GParamSpec *pspec)
{
LdDiagram *self;
self = LD_DIAGRAM (object);
switch (property_id)
{
case PROP_MODIFIED:
ld_diagram_set_modified (self, g_value_get_boolean (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
ld_diagram_dispose (GObject *gobject)
{
LdDiagram *self;
self = LD_DIAGRAM (gobject);
ld_diagram_clear_internal (self, FALSE);
/* Chain up to the parent class. */
G_OBJECT_CLASS (ld_diagram_parent_class)->dispose (gobject);
}
static void
ld_diagram_finalize (GObject *gobject)
{
/* Chain up to the parent class. */
G_OBJECT_CLASS (ld_diagram_parent_class)->finalize (gobject);
}
static void
ld_diagram_real_changed (LdDiagram *self)
{
g_return_if_fail (LD_IS_DIAGRAM (self));
ld_diagram_set_modified (self, TRUE);
}
/**
* ld_diagram_error_quark:
*
* Registers an error quark for #LdDiagram if necessary.
*
* Return value: the error quark used for #LdDiagram errors.
*/
GQuark
ld_diagram_error_quark (void)
{
return g_quark_from_static_string ("ld-diagram-error-quark");
}
/**
* ld_diagram_new:
*
* Create an instance.
*/
LdDiagram *
ld_diagram_new (void)
{
return g_object_new (LD_TYPE_DIAGRAM, NULL);
}
/**
* ld_diagram_clear:
* @self: an #LdDiagram object.
*
* Clear the whole diagram, including it's objects and history.
*/
void
ld_diagram_clear (LdDiagram *self)
{
g_return_if_fail (LD_IS_DIAGRAM (self));
ld_diagram_clear_internal (self, TRUE);
}
static void
ld_diagram_clear_internal (LdDiagram *self, gboolean emit_signals)
{
gboolean changed = FALSE;
gboolean selection_changed = FALSE;
if (self->priv->selection)
{
ld_diagram_unselect_all_internal (self);
selection_changed = TRUE;
}
if (self->priv->objects)
{
g_list_foreach (self->priv->objects, (GFunc) uninstall_object, self);
g_list_free (self->priv->objects);
self->priv->objects = NULL;
changed = TRUE;
}
destroy_action_stack (&self->priv->undo_stack);
destroy_action_stack (&self->priv->redo_stack);
if (emit_signals)
{
g_object_notify (G_OBJECT (self), "can-undo");
g_object_notify (G_OBJECT (self), "can-redo");
if (changed)
g_signal_emit (self,
LD_DIAGRAM_GET_CLASS (self)->changed_signal, 0);
if (selection_changed)
g_signal_emit (self,
LD_DIAGRAM_GET_CLASS (self)->selection_changed_signal, 0);
}
}
/**
* ld_diagram_load_from_file:
* @self: an #LdDiagram object.
* @filename: a filename.
* @error: (allow-none): return location for a #GError, or %NULL.
*
* Clear the diagram and load a file into it.
*
* Return value: %TRUE if the file could be loaded, %FALSE otherwise.
*/
gboolean
ld_diagram_load_from_file (LdDiagram *self,
const gchar *filename, GError **error)
{
JsonParser *parser;
GError *local_error;
g_return_val_if_fail (LD_IS_DIAGRAM (self), FALSE);
g_return_val_if_fail (filename != NULL, FALSE);
parser = json_parser_new ();
local_error = NULL;
json_parser_load_from_file (parser, filename, &local_error);
if (local_error)
{
g_propagate_error (error, local_error);
g_object_unref (parser);
return FALSE;
}
ld_diagram_clear (self);
self->priv->lock_history = TRUE;
local_error = NULL;
deserialize_diagram (self, json_parser_get_root (parser), &local_error);
self->priv->lock_history = FALSE;
g_object_unref (parser);
if (local_error)
{
g_propagate_error (error, local_error);
return FALSE;
}
return TRUE;
}
/**
* ld_diagram_save_to_file:
* @self: an #LdDiagram object.
* @filename: a filename.
* @error: (allow-none): return location for a #GError, or %NULL.
*
* Save the diagram into a file.
*
* Return value: %TRUE if the diagram could be saved, %FALSE otherwise.
*/
gboolean
ld_diagram_save_to_file (LdDiagram *self,
const gchar *filename, GError **error)
{
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GFile *file;
GFileOutputStream *file_stream;
JsonGenerator *generator;
JsonNode *root;
gchar *buffer;
gsize length;
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GError *local_error;
g_return_val_if_fail (LD_IS_DIAGRAM (self), FALSE);
g_return_val_if_fail (filename != NULL, FALSE);
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file = g_file_new_for_path (filename);
local_error = NULL;
file_stream = g_file_replace (file, NULL, FALSE,
G_FILE_CREATE_NONE, NULL, &local_error);
g_object_unref (file);
if (local_error)
{
g_propagate_error (error, local_error);
return FALSE;
}
local_error = NULL;
write_signature (G_OUTPUT_STREAM (file_stream), &local_error);
if (local_error)
{
g_object_unref (file_stream);
g_propagate_error (error, local_error);
return FALSE;
}
generator = json_generator_new ();
g_object_set (generator, "pretty", TRUE, NULL);
root = serialize_diagram (self);
json_generator_set_root (generator, root);
json_node_free (root);
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local_error = NULL;
buffer = json_generator_to_data (generator, &length);
g_output_stream_write (G_OUTPUT_STREAM (file_stream),
buffer, length, NULL, &local_error);
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g_object_unref (file_stream);
g_object_unref (generator);
g_free (buffer);
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if (local_error)
{
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g_propagate_error (error, local_error);
return FALSE;
}
return TRUE;
}
static gboolean
write_signature (GOutputStream *stream, GError **error)
{
static const gchar signature[] = "/* logdiag diagram */\n";
GError *local_error = NULL;
g_output_stream_write (stream, signature, sizeof (signature) - 1,
NULL, &local_error);
if (local_error)
{
g_propagate_error (error, local_error);
return FALSE;
}
return TRUE;
}
static gboolean
check_node (JsonNode *node, JsonNodeType type, const gchar *id, GError **error)
{
if (!node)
{
g_set_error (error, LD_DIAGRAM_ERROR, LD_DIAGRAM_ERROR_DIAGRAM_CORRUPT,
"%s is missing", id);
return FALSE;
}
if (!JSON_NODE_HOLDS (node, type))
{
g_set_error (error, LD_DIAGRAM_ERROR, LD_DIAGRAM_ERROR_DIAGRAM_CORRUPT,
"%s is of wrong type", id);
return FALSE;
}
return TRUE;
}
static gboolean
deserialize_diagram (LdDiagram *self, JsonNode *root, GError **error)
{
JsonObject *root_object;
JsonNode *objects_node;
GList *iter;
if (!check_node (root, JSON_NODE_OBJECT, "the root node", error))
return FALSE;
root_object = json_node_get_object (root);
objects_node = json_object_get_member (root_object, "objects");
if (!check_node (objects_node, JSON_NODE_ARRAY,
"the `objects' array", error))
return FALSE;
iter = json_array_get_elements (json_node_get_array (objects_node));
for (; iter; iter = g_list_next (iter))
{
GError *node_error = NULL;
check_node (iter->data, JSON_NODE_OBJECT, "object node", &node_error);
if (node_error)
{
g_warning ("%s", node_error->message);
g_error_free (node_error);
}
else
/* FIXME: Appending is slow. */
ld_diagram_insert_object (self,
deserialize_object (json_node_get_object (iter->data)), -1);
}
return TRUE;
}
static LdDiagramObject *
deserialize_object (JsonObject *object_storage)
{
JsonNode *object_type_node;
const gchar *type;
json_object_ref (object_storage);
object_type_node = json_object_get_member (object_storage, "type");
if (!object_type_node || !JSON_NODE_HOLDS_VALUE (object_type_node))
goto deserialize_object_default;
type = json_node_get_string (object_type_node);
if (!g_strcmp0 ("symbol", type))
return LD_DIAGRAM_OBJECT (ld_diagram_symbol_new (object_storage));
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if (!g_strcmp0 ("connection", type))
return LD_DIAGRAM_OBJECT (ld_diagram_connection_new (object_storage));
deserialize_object_default:
/* Anything we can't identify is just an indefinite object. */
return ld_diagram_object_new (object_storage);
}
static JsonNode *
serialize_diagram (LdDiagram *self)
{
JsonNode *root_node;
JsonObject *root_object;
JsonArray *objects_array;
GList *iter;
root_node = json_node_new (JSON_NODE_OBJECT);
root_object = json_object_new ();
json_node_take_object (root_node, root_object);
objects_array = json_array_new ();
for (iter = self->priv->objects; iter; iter = g_list_next (iter))
json_array_add_element (objects_array,
serialize_object (LD_DIAGRAM_OBJECT (iter->data)));
json_object_set_int_member (root_object, "version", 1);
json_object_set_array_member (root_object, "objects", objects_array);
return root_node;
}
static JsonNode *
serialize_object (LdDiagramObject *object)
{
JsonNode *object_node, *object_type_node;
JsonObject *object_storage;
object_node = json_node_new (JSON_NODE_OBJECT);
object_storage = ld_diagram_object_get_storage (object);
object_type_node = json_object_get_member (object_storage, "type");
if (!object_type_node || !JSON_NODE_HOLDS_VALUE (object_type_node))
json_object_set_string_member (object_storage,
"type", get_object_class_string (G_OBJECT_TYPE (object)));
json_node_set_object (object_node, object_storage);
return object_node;
}
static const gchar *
get_object_class_string (GType type)
{
if (type == LD_TYPE_DIAGRAM_SYMBOL)
return "symbol";
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if (type == LD_TYPE_DIAGRAM_CONNECTION)
return "connection";
if (type != LD_TYPE_DIAGRAM_OBJECT)
/* We don't know our own type, that's just plain wrong. */
g_warn_if_reached ();
return "object";
}
/**
* ld_diagram_get_modified:
* @self: an #LdDiagram object.
*
* Return value: the modification status of diagram.
*/
gboolean
ld_diagram_get_modified (LdDiagram *self)
{
g_return_val_if_fail (LD_IS_DIAGRAM (self), FALSE);
return self->priv->modified;
}
/**
* ld_diagram_set_modified:
* @self: an #LdDiagram object.
* @value: whether the diagram has been modified.
*
* Set the modification status of diagram.
*/
void
ld_diagram_set_modified (LdDiagram *self, gboolean value)
{
g_return_if_fail (LD_IS_DIAGRAM (self));
self->priv->modified = value;
g_object_notify (G_OBJECT (self), "modified");
}
static void
on_object_changed (LdDiagramObject *object,
LdUndoAction *action, gpointer user_data)
{
LdDiagram *self;
self = LD_DIAGRAM (user_data);
push_undo_action (self, action);
g_signal_emit (self,
LD_DIAGRAM_GET_CLASS (self)->changed_signal, 0);
}
static void
on_object_notify_storage (LdDiagramObject *object,
GParamSpec *pspec, gpointer user_data)
{
g_warning ("storage of a diagram object has changed");
}
/**
* ld_diagram_can_undo:
* @self: an #LdDiagram object.
*
* Return value: whether any action can be undone.
*/
gboolean
ld_diagram_can_undo (LdDiagram *self)
{
return self->priv->undo_stack != NULL;
}
/**
* ld_diagram_can_redo:
* @self: an #LdDiagram object.
*
* Return value: whether any undone action can be redone.
*/
gboolean
ld_diagram_can_redo (LdDiagram *self)
{
return self->priv->redo_stack != NULL;
}
static void
push_undo_action (LdDiagram *self, LdUndoAction *action)
{
GList **undo_list;
if (self->priv->lock_history)
return;
if (self->priv->redo_stack)
destroy_action_stack (&self->priv->redo_stack);
if (!self->priv->in_user_action)
self->priv->undo_stack = g_list_prepend (self->priv->undo_stack, NULL);
undo_list = (GList **) &self->priv->undo_stack->data;
g_object_ref (action);
*undo_list = g_list_prepend (*undo_list, action);
g_object_notify (G_OBJECT (self), "can-undo");
g_object_notify (G_OBJECT (self), "can-redo");
}
static void
destroy_action_stack (GList **stack)
{
GList *action, *sub;
for (action = *stack; action; action = g_list_next (action))
{
for (sub = action->data; sub; sub = g_list_next (sub))
g_object_unref (sub->data);
g_list_free (action->data);
}
g_list_free (*stack);
*stack = NULL;
}
/**
* ld_diagram_undo:
* @self: an #LdDiagram object.
*
* Undo the last action.
*/
void
ld_diagram_undo (LdDiagram *self)
{
GList *action, *sub;
g_return_if_fail (LD_IS_DIAGRAM (self));
g_return_if_fail (self->priv->in_user_action == 0);
if (!self->priv->undo_stack)
return;
self->priv->lock_history = TRUE;
action = self->priv->undo_stack;
self->priv->undo_stack = g_list_remove_link (action, action);
for (sub = action->data; sub; sub = g_list_next (sub))
ld_undo_action_undo (sub->data);
self->priv->redo_stack = g_list_concat (action, self->priv->redo_stack);
self->priv->lock_history = FALSE;
g_object_notify (G_OBJECT (self), "can-undo");
g_object_notify (G_OBJECT (self), "can-redo");
g_signal_emit (self,
LD_DIAGRAM_GET_CLASS (self)->changed_signal, 0);
}
/**
* ld_diagram_redo:
* @self: an #LdDiagram object.
*
* Redo the last undone action.
*/
void
ld_diagram_redo (LdDiagram *self)
{
GList *action, *sub;
g_return_if_fail (LD_IS_DIAGRAM (self));
g_return_if_fail (self->priv->in_user_action == 0);
if (!self->priv->redo_stack)
return;
self->priv->lock_history = TRUE;
action = self->priv->redo_stack;
self->priv->redo_stack = g_list_remove_link (action, action);
for (sub = g_list_last (action->data); sub; sub = g_list_previous (sub))
ld_undo_action_redo (sub->data);
self->priv->undo_stack = g_list_concat (action, self->priv->undo_stack);
self->priv->lock_history = FALSE;
g_object_notify (G_OBJECT (self), "can-undo");
g_object_notify (G_OBJECT (self), "can-redo");
g_signal_emit (self,
LD_DIAGRAM_GET_CLASS (self)->changed_signal, 0);
}
/**
* ld_diagram_begin_user_action:
* @self: an #LdDiagram object.
*
* Begin an indivisible user action. This function can be called
* multiple times. Each call has to be ended with a call to
* ld_diagram_end_user_action().
*/
void
ld_diagram_begin_user_action (LdDiagram *self)
{
g_return_if_fail (LD_IS_DIAGRAM (self));
/* Push an empty action on the stack. */
if (!self->priv->in_user_action++)
self->priv->undo_stack = g_list_prepend (self->priv->undo_stack, NULL);
}
/**
* ld_diagram_end_user_action:
* @self: an #LdDiagram object.
*
* End an indivisible user action.
*/
void
ld_diagram_end_user_action (LdDiagram *self)
{
g_return_if_fail (LD_IS_DIAGRAM (self));
g_return_if_fail (self->priv->in_user_action > 0);
/* If the action on the stack is empty, discard it. */
if (!--self->priv->in_user_action && !self->priv->undo_stack->data)
self->priv->undo_stack = g_list_delete_link
(self->priv->undo_stack, self->priv->undo_stack);
}
static void
on_object_action_remove (gpointer user_data)
{
ObjectActionData *data;
data = user_data;
g_return_if_fail (data->self != NULL);
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ld_diagram_remove_object
((LdDiagram *) data->self, data->object);
}
static void
on_object_action_insert (gpointer user_data)
{
ObjectActionData *data;
data = user_data;
g_return_if_fail (data->self != NULL);
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ld_diagram_insert_object
((LdDiagram *) data->self, data->object, data->pos);
}
static void
on_object_action_destroy (gpointer user_data)
{
ObjectActionData *data;
data = user_data;
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if (data->self)
g_object_remove_weak_pointer (G_OBJECT (data->self), &data->self);
g_object_unref (data->object);
g_slice_free (ObjectActionData, data);
}
static void
install_object (LdDiagramObject *object, LdDiagram *self)
{
g_signal_connect (object, "changed",
G_CALLBACK (on_object_changed), self);
g_signal_connect (object, "notify::storage",
G_CALLBACK (on_object_notify_storage), self);
g_object_ref (object);
}
static void
uninstall_object (LdDiagramObject *object, LdDiagram *self)
{
g_signal_handlers_disconnect_by_func (object,
on_object_changed, self);
g_signal_handlers_disconnect_by_func (object,
on_object_notify_storage, self);
g_object_unref (object);
}
/**
* ld_diagram_get_objects:
* @self: an #LdDiagram object.
*
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* Return value: (element-type LdDiagramObject): a list of all objects
* in the diagram. Do not modify.
*/
GList *
ld_diagram_get_objects (LdDiagram *self)
{
g_return_val_if_fail (LD_IS_DIAGRAM (self), NULL);
return self->priv->objects;
}
/**
* ld_diagram_insert_object:
* @self: an #LdDiagram object.
* @object: the object to be inserted.
* @pos: the position at which the object is to be inserted.
* Negative values will append to the end.
*
* Insert an object into the diagram.
*/
void
ld_diagram_insert_object (LdDiagram *self, LdDiagramObject *object, gint pos)
{
LdUndoAction *action;
ObjectActionData *action_data;
g_return_if_fail (LD_IS_DIAGRAM (self));
g_return_if_fail (LD_IS_DIAGRAM_OBJECT (object));
if (g_list_find (self->priv->objects, object))
return;
self->priv->objects = g_list_insert (self->priv->objects, object, pos);
install_object (object, self);
action_data = g_slice_new (ObjectActionData);
action_data->self = self;
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g_object_add_weak_pointer (G_OBJECT (self), &action_data->self);
action_data->object = g_object_ref (object);
action_data->pos = pos;
action = ld_undo_action_new (on_object_action_remove,
on_object_action_insert, on_object_action_destroy, action_data);
push_undo_action (self, action);
g_object_unref (action);
g_signal_emit (self,
LD_DIAGRAM_GET_CLASS (self)->changed_signal, 0);
}
/**
* ld_diagram_remove_object:
* @self: an #LdDiagram object.
* @object: the object to be removed.
*
* Remove an object from the diagram.
*/
void
ld_diagram_remove_object (LdDiagram *self, LdDiagramObject *object)
{
LdUndoAction *action;
ObjectActionData *action_data;
guint pos;
GList *link;
g_return_if_fail (LD_IS_DIAGRAM (self));
g_return_if_fail (LD_IS_DIAGRAM_OBJECT (object));
pos = 0;
for (link = self->priv->objects; link; link = g_list_next (link))
{
if (link->data == object)
break;
pos++;
}
if (!link)
return;
ld_diagram_unselect (self, object);
self->priv->objects = g_list_delete_link (self->priv->objects, link);
uninstall_object (object, self);
action_data = g_slice_new (ObjectActionData);
action_data->self = self;
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g_object_add_weak_pointer (G_OBJECT (self), &action_data->self);
action_data->object = g_object_ref (object);
action_data->pos = pos;
action = ld_undo_action_new (on_object_action_insert,
on_object_action_remove, on_object_action_destroy, action_data);
push_undo_action (self, action);
g_object_unref (action);
g_signal_emit (self,
LD_DIAGRAM_GET_CLASS (self)->changed_signal, 0);
}
/**
* ld_diagram_get_selection:
* @self: an #LdDiagram object.
*
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* Return value: (element-type LdDiagramObject): a list of objects that
* are currently selected in the diagram. Do not modify.
*/
GList *
ld_diagram_get_selection (LdDiagram *self)
{
g_return_val_if_fail (LD_IS_DIAGRAM (self), NULL);
return self->priv->selection;
}
/**
* ld_diagram_remove_selection:
* @self: an #LdDiagram object.
*
* Remove selected objects from the diagram.
*/
void
ld_diagram_remove_selection (LdDiagram *self)
{
GList *selection_copy, *iter;
g_return_if_fail (LD_IS_DIAGRAM (self));
/* We still retain references in the object list. */
selection_copy = g_list_copy (self->priv->selection);
ld_diagram_unselect_all (self);
ld_diagram_begin_user_action (self);
for (iter = selection_copy; iter; iter = g_list_next (iter))
ld_diagram_remove_object (self, LD_DIAGRAM_OBJECT (iter->data));
ld_diagram_end_user_action (self);
g_list_free (selection_copy);
}
/**
* ld_diagram_select:
* @self: an #LdDiagram object.
* @object: the object to be added to the selection.
*
* Add an object to selection.
*/
void
ld_diagram_select (LdDiagram *self, LdDiagramObject *object)
{
g_return_if_fail (LD_IS_DIAGRAM (self));
g_return_if_fail (LD_IS_DIAGRAM_OBJECT (object));
g_return_if_fail (g_list_find (self->priv->objects, object) != NULL);
if (g_list_find (self->priv->selection, object))
return;
self->priv->selection = g_list_insert (self->priv->selection, object, 0);
g_object_ref (object);
g_signal_emit (self,
LD_DIAGRAM_GET_CLASS (self)->selection_changed_signal, 0);
}
/**
* ld_diagram_unselect:
* @self: an #LdDiagram object.
* @object: the object to be removed from the selection.
*
* Remove an object from the selection.
*/
void
ld_diagram_unselect (LdDiagram *self, LdDiagramObject *object)
{
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GList *link;
g_return_if_fail (LD_IS_DIAGRAM (self));
g_return_if_fail (LD_IS_DIAGRAM_OBJECT (object));
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if (!(link = g_list_find (self->priv->selection, object)))
return;
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self->priv->selection = g_list_delete_link (self->priv->selection, link);
g_object_unref (object);
g_signal_emit (self,
LD_DIAGRAM_GET_CLASS (self)->selection_changed_signal, 0);
}
/**
* ld_diagram_select_all:
* @self: an #LdDiagram object.
*
* Include all objects in the document to the selection.
*/
void
ld_diagram_select_all (LdDiagram *self)
{
g_return_if_fail (LD_IS_DIAGRAM (self));
ld_diagram_unselect_all_internal (self);
self->priv->selection = g_list_copy (self->priv->objects);
g_list_foreach (self->priv->selection, (GFunc) g_object_ref, NULL);
g_signal_emit (self,
LD_DIAGRAM_GET_CLASS (self)->selection_changed_signal, 0);
}
/**
* ld_diagram_unselect_all:
* @self: an #LdDiagram object.
*
* Remove all objects from the current selection.
*/
void
ld_diagram_unselect_all (LdDiagram *self)
{
g_return_if_fail (LD_IS_DIAGRAM (self));
if (!self->priv->selection)
return;
ld_diagram_unselect_all_internal (self);
g_signal_emit (self,
LD_DIAGRAM_GET_CLASS (self)->selection_changed_signal, 0);
}
static void
ld_diagram_unselect_all_internal (LdDiagram *self)
{
g_list_foreach (self->priv->selection, (GFunc) g_object_unref, NULL);
g_list_free (self->priv->selection);
self->priv->selection = NULL;
}