gsignal.h

windows平台下开发gtk程序所需要的库和头文件等

/* GObject - GLib Type, Object, Parameter and Signal Library
 * Copyright (C) 2000-2001 Red Hat, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General
 * Public License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 */
#if !defined (__GLIB_GOBJECT_H_INSIDE__) && !defined (GOBJECT_COMPILATION)
#error "Only <glib-object.h> can be included directly."
#endif

#ifndef __G_SIGNAL_H__
#define __G_SIGNAL_H__

#include	<gobject/gclosure.h>
#include	<gobject/gvalue.h>
#include	<gobject/gparam.h>
#include	<gobject/gmarshal.h>

G_BEGIN_DECLS

/* --- typedefs --- */
typedef struct _GSignalQuery		 GSignalQuery;
typedef struct _GSignalInvocationHint	 GSignalInvocationHint;
/**
 * GSignalCMarshaller:
 * 
 * This is the signature of marshaller functions, required to marshall
 * arrays of parameter values to signal emissions into C language callback
 * invocations. It is merely an alias to #GClosureMarshal since the #GClosure
 * mechanism takes over responsibility of actual function invocation for the
 * signal system.
 */
typedef GClosureMarshal			 GSignalCMarshaller;
/**
 * GSignalEmissionHook:
 * @ihint: Signal invocation hint, see #GSignalInvocationHint.
 * @n_param_values: the number of parameters to the function, including
 *  the instance on which the signal was emitted.
 * @param_values: the instance on which the signal was emitted, followed by the 
 *  parameters of the emission.
 * @data: user data associated with the hook.
 * 
 * A simple function pointer to get invoked when the signal is emitted. This 
 * allows you to tie a hook to the signal type, so that it will trap all 
 * emissions of that signal, from any object.
 * 
 * You may not attach these to signals created with the #G_SIGNAL_NO_HOOKS flag.
 * 
 * Returns: whether it wants to stay connected. If it returns %FALSE, the signal 
 *  hook is disconnected (and destroyed).
 */
typedef gboolean (*GSignalEmissionHook) (GSignalInvocationHint *ihint,
					 guint			n_param_values,
					 const GValue	       *param_values,
					 gpointer		data);
/**
 * GSignalAccumulator:
 * @ihint: Signal invocation hint, see #GSignalInvocationHint.
 * @return_accu: Accumulator to collect callback return values in, this
 *  is the return value of the current signal emission.
 * @handler_return: A #GValue holding the return value of the signal handler.
 * @data: Callback data that was specified when creating the signal.
 * 
 * The signal accumulator is a special callback function that can be used
 * to collect return values of the various callbacks that are called
 * during a signal emission. The signal accumulator is specified at signal
 * creation time, if it is left %NULL, no accumulation of callback return
 * values is performed. The return value of signal emissions is then the
 * value returned by the last callback.
 * 
 * Returns: The accumulator function returns whether the signal emission
 *  should be aborted. Returning %FALSE means to abort the
 *  current emission and %TRUE is returned for continuation.
 */
typedef gboolean (*GSignalAccumulator)	(GSignalInvocationHint *ihint,
					 GValue		       *return_accu,
					 const GValue	       *handler_return,
					 gpointer               data);


/* --- run, match and connect types --- */
/**
 * GSignalFlags:
 * @G_SIGNAL_RUN_FIRST: Invoke the object method handler in the first emission stage.
 * @G_SIGNAL_RUN_LAST: Invoke the object method handler in the third emission stage.
 * @G_SIGNAL_RUN_CLEANUP: Invoke the object method handler in the last emission stage.
 * @G_SIGNAL_NO_RECURSE: Signals being emitted for an object while currently being in
 *  emission for this very object will not be emitted recursively,
 *  but instead cause the first emission to be restarted.
 * @G_SIGNAL_DETAILED: This signal supports "::detail" appendices to the signal name
 *  upon handler connections and emissions.
 * @G_SIGNAL_ACTION: Action signals are signals that may freely be emitted on alive
 *  objects from user code via g_signal_emit() and friends, without
 *  the need of being embedded into extra code that performs pre or
 *  post emission adjustments on the object. They can also be thought
 *  of as object methods which can be called generically by 
 *  third-party code.
 * @G_SIGNAL_NO_HOOKS: No emissions hooks are supported for this signal.
 * 
 * The signal flags are used to specify a signal's behaviour, the overall
 * signal description outlines how especially the RUN flags control the
 * stages of a signal emission.
 */
typedef enum
{
  G_SIGNAL_RUN_FIRST	= 1 << 0,
  G_SIGNAL_RUN_LAST	= 1 << 1,
  G_SIGNAL_RUN_CLEANUP	= 1 << 2,
  G_SIGNAL_NO_RECURSE	= 1 << 3,
  G_SIGNAL_DETAILED	= 1 << 4,
  G_SIGNAL_ACTION	= 1 << 5,
  G_SIGNAL_NO_HOOKS	= 1 << 6
} GSignalFlags;
/**
 * G_SIGNAL_FLAGS_MASK:
 * 
 * A mask for all #GSignalFlags bits.
 */
#define G_SIGNAL_FLAGS_MASK  0x7f
/**
 * GConnectFlags:
 * @G_CONNECT_AFTER: whether the handler should be called before or after the 
 *  default handler of the signal.
 * @G_CONNECT_SWAPPED: whether the instance and data should be swapped when
 *  calling the handler.
 * 
 * The connection flags are used to specify the behaviour of a signal's 
 * connection.
 */
typedef enum
{
  G_CONNECT_AFTER	= 1 << 0,
  G_CONNECT_SWAPPED	= 1 << 1
} GConnectFlags;
/**
 * GSignalMatchType:
 * @G_SIGNAL_MATCH_ID: The signal id must be equal.
 * @G_SIGNAL_MATCH_DETAIL: The signal detail be equal.
 * @G_SIGNAL_MATCH_CLOSURE: The closure must be the same.
 * @G_SIGNAL_MATCH_FUNC: The C closure callback must be the same.
 * @G_SIGNAL_MATCH_DATA: The closure data must be the same.
 * @G_SIGNAL_MATCH_UNBLOCKED: Only unblocked signals may matched.
 * 
 * The match types specify what g_signal_handlers_block_matched(),
 * g_signal_handlers_unblock_matched() and g_signal_handlers_disconnect_matched()
 * match signals by.
 */
typedef enum
{
  G_SIGNAL_MATCH_ID	   = 1 << 0,
  G_SIGNAL_MATCH_DETAIL	   = 1 << 1,
  G_SIGNAL_MATCH_CLOSURE   = 1 << 2,
  G_SIGNAL_MATCH_FUNC	   = 1 << 3,
  G_SIGNAL_MATCH_DATA	   = 1 << 4,
  G_SIGNAL_MATCH_UNBLOCKED = 1 << 5
} GSignalMatchType;
/**
 * G_SIGNAL_MATCH_MASK:
 * 
 * A mask for all #GSignalMatchType bits.
 */
#define G_SIGNAL_MATCH_MASK  0x3f
/**
 * G_SIGNAL_TYPE_STATIC_SCOPE:
 * 
 * This macro flags signal argument types for which the signal system may 
 * assume that instances thereof remain persistent across all signal emissions
 * they are used in. This is only useful for non ref-counted, value-copy types.
 * 
 * To flag a signal argument in this way, add 
 * <literal>| G_SIGNAL_TYPE_STATIC_SCOPE</literal> to the corresponding argument
 * of g_signal_new().
 * |[
 * g_signal_new ("size_request",
 *   G_TYPE_FROM_CLASS (gobject_class),
 * 	 G_SIGNAL_RUN_FIRST,
 * 	 G_STRUCT_OFFSET (GtkWidgetClass, size_request),
 * 	 NULL, NULL,
 * 	 _gtk_marshal_VOID__BOXED,
 * 	 G_TYPE_NONE, 1,
 * 	 GTK_TYPE_REQUISITION | G_SIGNAL_TYPE_STATIC_SCOPE);
 * ]|
 */
#define	G_SIGNAL_TYPE_STATIC_SCOPE (G_TYPE_FLAG_RESERVED_ID_BIT)


/* --- signal information --- */
/**
 * GSignalInvocationHint:
 * @signal_id: The signal id of the signal invoking the callback
 * @detail: The detail passed on for this emission
 * @run_type: The stage the signal emission is currently in, this
 *  field will contain one of %G_SIGNAL_RUN_FIRST,
 *  %G_SIGNAL_RUN_LAST or %G_SIGNAL_RUN_CLEANUP.
 * 
 * The #GSignalInvocationHint structure is used to pass on additional information
 * to callbacks during a signal emission.
 */
struct _GSignalInvocationHint
{
  guint		signal_id;
  GQuark	detail;
  GSignalFlags	run_type;
};
/**
 * GSignalQuery:
 * @signal_id: The signal id of the signal being queried, or 0 if the
 *  signal to be queried was unknown.
 * @signal_name: The signal name.
 * @itype: The interface/instance type that this signal can be emitted for.
 * @signal_flags: The signal flags as passed in to g_signal_new().
 * @return_type: The return type for user callbacks.
 * @n_params: The number of parameters that user callbacks take.
 * @param_types: The individual parameter types for user callbacks, note that the
 *  effective callback signature is:
 *  <programlisting>
 *  @return_type callback (#gpointer     data1,
 *  [#param_types param_names,]
 *  #gpointer     data2);
 *  </programlisting>
 * 
 * A structure holding in-depth information for a specific signal. It is
 * filled in by the g_signal_query() function.
 */
struct _GSignalQuery
{
  guint		signal_id;
  const gchar  *signal_name;
  GType		itype;
  GSignalFlags	signal_flags;
  GType		return_type; /* mangled with G_SIGNAL_TYPE_STATIC_SCOPE flag */
  guint		n_params;
  const GType  *param_types; /* mangled with G_SIGNAL_TYPE_STATIC_SCOPE flag */
};


/* --- signals --- */
guint                 g_signal_newv         (const gchar        *signal_name,
					     GType               itype,
					     GSignalFlags        signal_flags,
					     GClosure           *class_closure,
					     GSignalAccumulator	 accumulator,
					     gpointer		 accu_data,