GDK 事件类型@GTK+ 2.0 中文教程连载

GDK 事件类型

下列的数据类型被 GTK+ 传递给事件处理函数。列出每种数据类型同时也列出了使用该类型的信号。

• GdkEvent

  • drag_end_event

• GdkEventType

• GdkEventAny

  • delete_event

  • destroy_event

  • map_event

  • unmap_event

  • no_expose_event

• GdkEventExpose

  • expose_event

• GdkEventNoExpose

• GdkEventVisibility

• GdkEventMotion

  • motion_notify_event

• GdkEventButton

  • button_press_event

  • button_release_event

• GdkEventKey

  • key_press_event

  • key_release_event

• GdkEventCrossing

  • enter_notify_event

  • leave_notify_event

• GdkEventFocus

  • focus_in_event

  • focus_out_event

• GdkEventConfigure

  • configure_event

• GdkEventProperty

  • property_notify_event

• GdkEventSelection

  • selection_clear_event

  • selection_request_event

  • selection_notify_event

• GdkEventProximity

  • proximity_in_event

  • proximity_out_event

• GdkEventDragBegin

  • drag_begin_event

• GdkEventDragRequest

  • drag_request_event

• GdkEventDropEnter

  • drop_enter_event

• GdkEventDropLeave

  • drop_leave_event

• GdkEventDropDataAvailable

  • drop_data_available_event

• GdkEventClient

  • client_event

• GdkEventOther

  • other_event

数据类型GdkEventType 是一个特殊的数据类型，它被其余的数据类型使用，作为一个传递给信号处理函数的数据类型指示器。在下面你会看到，每个事件数据结构有一个该类型的成员。它是如下的枚举值：

typedef enum { GDK_NOTHING = -1, GDK_DELETE = 0, GDK_DESTROY = 1, GDK_EXPOSE = 2, GDK_MOTION_NOTIFY = 3, GDK_BUTTON_PRESS = 4, GDK_2BUTTON_PRESS = 5, GDK_3BUTTON_PRESS = 6, GDK_BUTTON_RELEASE = 7, GDK_KEY_PRESS = 8, GDK_KEY_RELEASE = 9, GDK_ENTER_NOTIFY = 10, GDK_LEAVE_NOTIFY = 11, GDK_FOCUS_CHANGE = 12, GDK_CONFIGURE = 13, GDK_MAP = 14, GDK_UNMAP = 15, GDK_PROPERTY_NOTIFY = 16, GDK_SELECTION_CLEAR = 17, GDK_SELECTION_REQUEST = 18, GDK_SELECTION_NOTIFY = 19, GDK_PROXIMITY_IN = 20, GDK_PROXIMITY_OUT = 21, GDK_DRAG_BEGIN = 22, GDK_DRAG_REQUEST = 23, GDK_DROP_ENTER = 24, GDK_DROP_LEAVE = 25, GDK_DROP_DATA_AVAIL = 26, GDK_CLIENT_EVENT = 27, GDK_VISIBILITY_NOTIFY = 28, GDK_NO_EXPOSE = 29, GDK_OTHER_EVENT = 9999 /* 不赞成使用，用过虑器代替 */ } GdkEventType;

剩下的，与其余事件类型不同的是GdkEvent 。它是所有其余数据类型的统一，允许在一个信号处理函数中转换为指定的事件数据类型。

因此，事件类型有如下定义：

struct _GdkEventAny { GdkEventType type; GdkWindow *window; gint8 send_event; }; struct _GdkEventExpose { GdkEventType type; GdkWindow *window; gint8 send_event; GdkRectangle area; gint count; /* 如果非零，它是跟随事件的数目。*/ }; struct _GdkEventNoExpose { GdkEventType type; GdkWindow *window; gint8 send_event; /* XXX: 有人需要X major_code或minor_code域吗？*/ }; struct _GdkEventVisibility { GdkEventType type; GdkWindow *window; gint8 send_event; GdkVisibilityState state; }; struct _GdkEventMotion { GdkEventType type; GdkWindow *window; gint8 send_event; guint32 time; gdouble x; gdouble y; gdouble pressure; gdouble xtilt; gdouble ytilt; guint state; gint16 is_hint; GdkInputSource source; guint32 deviceid; gdouble x_root, y_root; }; struct _GdkEventButton { GdkEventType type; GdkWindow *window; gint8 send_event; guint32 time; gdouble x; gdouble y; gdouble pressure; gdouble xtilt; gdouble ytilt; guint state; guint button; GdkInputSource source; guint32 deviceid; gdouble x_root, y_root; }; struct _GdkEventKey { GdkEventType type; GdkWindow *window; gint8 send_event; guint32 time; guint state; guint keyval; gint length; gchar *string; }; struct _GdkEventCrossing { GdkEventType type; GdkWindow *window; gint8 send_event; GdkWindow *subwindow; GdkNotifyType detail; }; struct _GdkEventFocus { GdkEventType type; GdkWindow *window; gint8 send_event; gint16 in; }; struct _GdkEventConfigure { GdkEventType type; GdkWindow *window; gint8 send_event; gint16 x, y; gint16 width; gint16 height; }; struct _GdkEventProperty { GdkEventType type; GdkWindow *window; gint8 send_event; GdkAtom atom; guint32 time; guint state; }; struct _GdkEventSelection { GdkEventType type; GdkWindow *window; gint8 send_event; GdkAtom selection; GdkAtom target; GdkAtom property; guint32 requestor; guint32 time; }; /* 这个事件数据类型很少用。它在支持XInput的程序中，用于绘制自己的光标 */ struct _GdkEventProximity { GdkEventType type; GdkWindow *window; gint8 send_event; guint32 time; GdkInputSource source; guint32 deviceid; }; struct _GdkEventDragRequest { GdkEventType type; GdkWindow *window; gint8 send_event; guint32 requestor; union { struct { guint protocol_version:4; guint sendreply:1; guint willaccept:1; guint delete_data:1; guint senddata:1; guint reserved:22; } flags; glong allflags; } u; guint8 isdrop; /* 几个 X 事件能产生这个gdk事件---这让应用程序知道拖放是否真的发生 或我们仅仅设置数据 */ GdkPoint drop_coords; gchar *data_type; guint32 timestamp; }; struct _GdkEventDragBegin { GdkEventType type; GdkWindow *window; gint8 send_event; union { struct { guint protocol_version:4; guint reserved:28; } flags; glong allflags; } u; }; struct _GdkEventDropEnter { GdkEventType type; GdkWindow *window; gint8 send_event; guint32 requestor; union { struct { guint protocol_version:4; guint sendreply:1; guint extended_typelist:1; guint reserved:26; } flags; glong allflags; } u; }; struct _GdkEventDropLeave { GdkEventType type; GdkWindow *window; gint8 send_event; guint32 requestor; union { struct { guint protocol_version:4; guint reserved:28; } flags; glong allflags; } u; }; struct _GdkEventDropDataAvailable { GdkEventType type; GdkWindow *window; gint8 send_event; guint32 requestor; union { struct { guint protocol_version:4; guint isdrop:1; guint reserved:25; } flags; glong allflags; } u; gchar *data_type; /* MIME类型 */ gulong data_numbytes; gpointer data; guint32 timestamp; GdkPoint coords; }; struct _GdkEventClient { GdkEventType type; GdkWindow *window; gint8 send_event; GdkAtom message_type; gushort data_format; union { char b[20]; short s[10]; long l[5]; } data; }; struct _GdkEventOther { GdkEventType type; GdkWindow *window; gint8 send_event; GdkXEvent *xevent; };

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