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DiaCanvas2 Reference Manual | ![]() |
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#define DIA_UNDO_MANAGER (obj) DiaUndoManager; void dia_undo_manager_begin_transaction (DiaUndoManager *undo_manager); void dia_undo_manager_commit_transaction (DiaUndoManager *undo_manager); void dia_undo_manager_discard_transaction (DiaUndoManager *undo_manager); void dia_undo_manager_undo_transaction (DiaUndoManager *undo_manager); void dia_undo_manager_redo_transaction (DiaUndoManager *undo_manager); gboolean dia_undo_manager_in_transaction (DiaUndoManager *undo_manager); gboolean dia_undo_manager_can_undo (DiaUndoManager *undo_manager); gboolean dia_undo_manager_can_redo (DiaUndoManager *undo_manager); DiaUndoAction; DiaUndoAction* dia_undo_action_new (gsize sizeof_undo_action, DiaUndoFunc undo, DiaUndoFunc redo, GDestroyNotify destroy); void dia_undo_action_undo (DiaUndoAction *action); void dia_undo_action_redo (DiaUndoAction *action); void dia_undo_action_destroy (DiaUndoAction *action);
"add-undo-action" void user_function (DiaUndoManager *diaundomanager, gpointer arg1, gpointer user_data) : Run last "begin-transaction" void user_function (DiaUndoManager *diaundomanager, gpointer user_data) : Run last "commit-transaction" void user_function (DiaUndoManager *diaundomanager, gpointer user_data) : Run last "discard-transaction" void user_function (DiaUndoManager *diaundomanager, gpointer user_data) : Run last "redo-transaction" void user_function (DiaUndoManager *diaundomanager, gpointer user_data) : Run last "undo-transaction" void user_function (DiaUndoManager *diaundomanager, gpointer user_data) : Run last
The DiaUndoManager interface provides an interface to the pluggable undo mechanism in DiaCanvas2.
#define DIA_UNDO_MANAGER(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), DIA_TYPE_UNDO_MANAGER, DiaUndoManager))
obj : |
typedef struct _DiaUndoManager DiaUndoManager;
This interface provides the functions that are used to gather and act on undo information.
void dia_undo_manager_begin_transaction (DiaUndoManager *undo_manager);
Begin a new transaction.
undo_manager : |
void dia_undo_manager_commit_transaction (DiaUndoManager *undo_manager);
Store the transaction on the undo stack. If there are no actions to be undone, a specific implementation may consider no storing it.
undo_manager : |
void dia_undo_manager_discard_transaction (DiaUndoManager *undo_manager);
Discard the current transaction. It is not stored on the undo stack.
undo_manager : |
void dia_undo_manager_undo_transaction (DiaUndoManager *undo_manager);
Undo the actions in the last commited transaction.
undo_manager : |
void dia_undo_manager_redo_transaction (DiaUndoManager *undo_manager);
undo_manager : |
gboolean dia_undo_manager_in_transaction (DiaUndoManager *undo_manager);
This function returns TRUE if there is an open transaction.
undo_manager : |
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Returns : |
gboolean dia_undo_manager_can_undo (DiaUndoManager *undo_manager);
undo_manager : |
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Returns : | TRUE if there are transactions that can be undone. |
gboolean dia_undo_manager_can_redo (DiaUndoManager *undo_manager);
undo_manager : |
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Returns : | TRUE if there are transactions that can be redone. |
typedef struct { DiaUndoFunc undo; DiaUndoFunc redo; GDestroyNotify destroy; } DiaUndoAction;
DiaUndoAction* dia_undo_action_new (gsize sizeof_undo_action, DiaUndoFunc undo, DiaUndoFunc redo, GDestroyNotify destroy);
Create a new DiaUndoAction. DiaUndoAction is the object that is passed to the UndoManager. This "class" is normally subclassed, so specific attributes can be stored (this struct is an "abstract class").
sizeof_undo_action : |
Size of the real undo entry |
undo : |
function called on an undo operation |
redo : |
function called in a redo operation |
destroy : |
function called to free the resources held by this undo entry |
Returns : |
void user_function (DiaUndoManager *diaundomanager, gpointer arg1, gpointer user_data) : Run last
diaundomanager : |
the object which received the signal. |
arg1 : |
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user_data : |
user data set when the signal handler was connected. |
void user_function (DiaUndoManager *diaundomanager, gpointer user_data) : Run last
diaundomanager : |
the object which received the signal. |
user_data : |
user data set when the signal handler was connected. |
void user_function (DiaUndoManager *diaundomanager, gpointer user_data) : Run last
diaundomanager : |
the object which received the signal. |
user_data : |
user data set when the signal handler was connected. |
void user_function (DiaUndoManager *diaundomanager, gpointer user_data) : Run last
diaundomanager : |
the object which received the signal. |
user_data : |
user data set when the signal handler was connected. |
void user_function (DiaUndoManager *diaundomanager, gpointer user_data) : Run last
diaundomanager : |
the object which received the signal. |
user_data : |
user data set when the signal handler was connected. |
void user_function (DiaUndoManager *diaundomanager, gpointer user_data) : Run last
diaundomanager : |
the object which received the signal. |
user_data : |
user data set when the signal handler was connected. |