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gdkevents.c
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gdkevents.c
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/* GDK - The GIMP Drawing Kit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* 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, see <http://www.gnu.org/licenses/>.
*/
/*
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include "config.h"
#include "gdkdisplayprivate.h"
#include "gdkdragprivate.h"
#include "gdkdropprivate.h"
#include "gdkeventsprivate.h"
#include <glib/gi18n-lib.h>
#include "gdkkeysprivate.h"
#include "gdkkeysyms.h"
#include "gdkprivate.h"
#include <gobject/gvaluecollector.h>
#include <string.h>
#include <math.h>
/**
* GdkEvent: (ref-func gdk_event_ref) (unref-func gdk_event_unref)
*
* `GdkEvent`s are immutable data structures, created by GDK to
* represent windowing system events.
*
* In GTK applications the events are handled automatically by toplevel
* widgets and passed on to the event controllers of appropriate widgets,
* so using `GdkEvent` and its related API is rarely needed.
*/
/**
* GdkEventSequence:
*
* `GdkEventSequence` is an opaque type representing a sequence
* of related touch events.
*/
static void
value_event_init (GValue *value)
{
value->data[0].v_pointer = NULL;
}
static void
value_event_free_value (GValue *value)
{
if (value->data[0].v_pointer != NULL)
gdk_event_unref (value->data[0].v_pointer);
}
static void
value_event_copy_value (const GValue *src,
GValue *dst)
{
if (src->data[0].v_pointer != NULL)
dst->data[0].v_pointer = gdk_event_ref (src->data[0].v_pointer);
else
dst->data[0].v_pointer = NULL;
}
static gpointer
value_event_peek_pointer (const GValue *value)
{
return value->data[0].v_pointer;
}
static char *
value_event_collect_value (GValue *value,
guint n_collect_values,
GTypeCValue *collect_values,
guint collect_flags)
{
GdkEvent *event = collect_values[0].v_pointer;
if (event == NULL)
{
value->data[0].v_pointer = NULL;
return NULL;
}
if (event->parent_instance.g_class == NULL)
return g_strconcat ("invalid unclassed GdkEvent pointer for "
"value type '",
G_VALUE_TYPE_NAME (value),
"'",
NULL);
value->data[0].v_pointer = gdk_event_ref (event);
return NULL;
}
static char *
value_event_lcopy_value (const GValue *value,
guint n_collect_values,
GTypeCValue *collect_values,
guint collect_flags)
{
GdkEvent **event_p = collect_values[0].v_pointer;
if (event_p == NULL)
return g_strconcat ("value location for '",
G_VALUE_TYPE_NAME (value),
"' passed as NULL",
NULL);
if (value->data[0].v_pointer == NULL)
*event_p = NULL;
else if (collect_flags & G_VALUE_NOCOPY_CONTENTS)
*event_p = value->data[0].v_pointer;
else
*event_p = gdk_event_ref (value->data[0].v_pointer);
return NULL;
}
static void
gdk_event_finalize (GdkEvent *self)
{
g_clear_object (&self->surface);
g_clear_object (&self->device);
g_type_free_instance ((GTypeInstance *) self);
}
static GdkModifierType
gdk_event_real_get_state (GdkEvent *self)
{
return 0;
}
static gboolean
gdk_event_real_get_position (GdkEvent *self,
double *x,
double *y)
{
*x = NAN;
*y = NAN;
return FALSE;
}
static GdkEventSequence *
gdk_event_real_get_sequence (GdkEvent *self)
{
return NULL;
}
static GdkDeviceTool *
gdk_event_real_get_tool (GdkEvent *self)
{
return NULL;
}
static gboolean
gdk_event_real_get_axes (GdkEvent *self,
double **axes,
guint *n_axes)
{
return FALSE;
}
static void
gdk_event_class_init (GdkEventClass *klass)
{
klass->finalize = gdk_event_finalize;
klass->get_state = gdk_event_real_get_state;
klass->get_position = gdk_event_real_get_position;
klass->get_sequence = gdk_event_real_get_sequence;
klass->get_tool = gdk_event_real_get_tool;
klass->get_axes = gdk_event_real_get_axes;
}
static void
gdk_event_init (GdkEvent *self)
{
g_ref_count_init (&self->ref_count);
}
GType
gdk_event_get_type (void)
{
static gsize event_type__volatile;
if (g_once_init_enter (&event_type__volatile))
{
static const GTypeFundamentalInfo finfo = {
(G_TYPE_FLAG_CLASSED |
G_TYPE_FLAG_INSTANTIATABLE |
G_TYPE_FLAG_DERIVABLE |
G_TYPE_FLAG_DEEP_DERIVABLE),
};
static const GTypeValueTable value_table = {
value_event_init,
value_event_free_value,
value_event_copy_value,
value_event_peek_pointer,
"p",
value_event_collect_value,
"p",
value_event_lcopy_value,
};
const GTypeInfo event_info = {
/* Class */
sizeof (GdkEventClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gdk_event_class_init,
(GClassFinalizeFunc) NULL,
NULL,
/* Instance */
sizeof (GdkEvent),
0,
(GInstanceInitFunc) gdk_event_init,
/* GValue */
&value_table,
};
GType event_type =
g_type_register_fundamental (g_type_fundamental_next (),
g_intern_static_string ("GdkEvent"),
&event_info, &finfo,
G_TYPE_FLAG_ABSTRACT);
g_once_init_leave (&event_type__volatile, event_type);
}
return event_type__volatile;
}
/*< private >
* GdkEventTypeInfo:
* @instance_size: the size of the instance of a GdkEvent subclass
* @instance_init: (nullable): the function to initialize the instance data
* @finalize: (nullable): the function to free the instance data
* @get_state: (nullable): the function to retrieve the `GdkModifierType`:w
* associated to the event
* @get_position: (nullable): the function to retrieve the event coordinates
* @get_sequence: (nullable): the function to retrieve the event sequence
* @get_tool: (nullable): the function to retrieve the event's device tool
* @get_axes: (nullable): the function to retrieve the event's axes
*
* A structure used when registering a new GdkEvent type.
*/
typedef struct {
gsize instance_size;
void (* instance_init) (GdkEvent *event);
void (* finalize) (GdkEvent *event);
GdkModifierType (* get_state) (GdkEvent *event);
gboolean (* get_position) (GdkEvent *event,
double *x,
double *y);
GdkEventSequence *(* get_sequence) (GdkEvent *event);
GdkDeviceTool *(* get_tool) (GdkEvent *event);
gboolean (* get_axes) (GdkEvent *event,
double **axes,
guint *n_axes);
} GdkEventTypeInfo;
static void
gdk_event_generic_class_init (gpointer g_class,
gpointer class_data)
{
GdkEventTypeInfo *info = class_data;
GdkEventClass *event_class = g_class;
/* Optional */
if (info->finalize != NULL)
event_class->finalize = info->finalize;
if (info->get_state != NULL)
event_class->get_state = info->get_state;
if (info->get_position != NULL)
event_class->get_position = info->get_position;
if (info->get_sequence != NULL)
event_class->get_sequence = info->get_sequence;
if (info->get_tool != NULL)
event_class->get_tool = info->get_tool;
if (info->get_axes != NULL)
event_class->get_axes = info->get_axes;
g_free (info);
}
static GType
gdk_event_type_register_static (const char *type_name,
const GdkEventTypeInfo *type_info)
{
GTypeInfo info;
info.class_size = sizeof (GdkEventClass);
info.base_init = NULL;
info.base_finalize = NULL;
info.class_init = gdk_event_generic_class_init;
info.class_finalize = NULL;
info.class_data = g_memdup2 (type_info, sizeof (GdkEventTypeInfo));
info.instance_size = type_info->instance_size;
info.n_preallocs = 0;
info.instance_init = (GInstanceInitFunc) type_info->instance_init;
info.value_table = NULL;
return g_type_register_static (GDK_TYPE_EVENT, type_name, &info, 0);
}
/* Map GdkEventType to the appropriate GType */
static GType gdk_event_types[GDK_EVENT_LAST];
/*< private >
* GDK_EVENT_TYPE_SLOT:
* @ETYPE: a `GdkEvent`Type
*
* Associates a `GdkEvent` type with the given `GdkEvent`Type enumeration.
*
* This macro can only be used with %GDK_DEFINE_EVENT_TYPE.
*/
#define GDK_EVENT_TYPE_SLOT(ETYPE) { gdk_event_types[ETYPE] = gdk_define_event_type_id; }
/*< private >
* GDK_DEFINE_EVENT_TYPE:
* @TypeName: the type name, in camel case
* @type_name: the type name, in snake case
* @type_info: the address of the `GdkEvent`TypeInfo for the event type
* @_C_: custom code to call after registering the event type
*
* Registers a new `GdkEvent` subclass with the given @TypeName and @type_info.
*
* Similarly to %G_DEFINE_TYPE_WITH_CODE, this macro will generate a `get_type()`
* function that registers the event type.
*
* You can specify code to be run after the type registration; the `GType` of
* the event is available in the `gdk_define_event_type_id` variable.
*/
#define GDK_DEFINE_EVENT_TYPE(TypeName, type_name, type_info, _C_) \
GType \
type_name ## _get_type (void) \
{ \
static gsize gdk_define_event_type_id__volatile; \
if (g_once_init_enter (&gdk_define_event_type_id__volatile)) \
{ \
GType gdk_define_event_type_id = \
gdk_event_type_register_static (g_intern_static_string (#TypeName), type_info); \
{ _C_ } \
g_once_init_leave (&gdk_define_event_type_id__volatile, gdk_define_event_type_id); \
} \
return gdk_define_event_type_id__volatile; \
}
#define GDK_EVENT_SUPER(event) \
((GdkEventClass *) g_type_class_peek (g_type_parent (G_TYPE_FROM_INSTANCE (event))))
/*< private >
* gdk_event_alloc:
* @event_type: the `GdkEvent`Type to allocate
* @surface: (nullable): the `GdkSurface` of the event
* @device: (nullable): the `GdkDevice` of the event
* @time_: the event serial
*
* Allocates a `GdkEvent` for the given @event_type, and sets its
* common fields with the given parameters.
*
* Returns: (transfer full): the newly allocated `GdkEvent` instance
*/
static gpointer
gdk_event_alloc (GdkEventType event_type,
GdkSurface *surface,
GdkDevice *device,
guint32 time_)
{
g_assert (event_type >= GDK_DELETE && event_type < GDK_EVENT_LAST);
g_assert (gdk_event_types[event_type] != G_TYPE_INVALID);
GdkEvent *event = (GdkEvent *) g_type_create_instance (gdk_event_types[event_type]);
if (GDK_DEBUG_CHECK (EVENTS))
{
char *str = g_enum_to_string (GDK_TYPE_EVENT_TYPE, event_type);
gdk_debug_message ("Allocating a new %s for event type %s",
g_type_name (gdk_event_types[event_type]), str);
g_free (str);
}
event->event_type = event_type;
event->surface = surface != NULL ? g_object_ref (surface) : NULL;
event->device = device != NULL ? g_object_ref (device) : NULL;
event->time = time_;
if (device != NULL && time_ != GDK_CURRENT_TIME)
gdk_device_set_timestamp (device, time_);
return event;
}
static void
gdk_event_init_types_once (void)
{
g_type_ensure (GDK_TYPE_BUTTON_EVENT);
g_type_ensure (GDK_TYPE_CROSSING_EVENT);
g_type_ensure (GDK_TYPE_DELETE_EVENT);
g_type_ensure (GDK_TYPE_DND_EVENT);
g_type_ensure (GDK_TYPE_FOCUS_EVENT);
g_type_ensure (GDK_TYPE_GRAB_BROKEN_EVENT);
g_type_ensure (GDK_TYPE_KEY_EVENT);
g_type_ensure (GDK_TYPE_MOTION_EVENT);
g_type_ensure (GDK_TYPE_PAD_EVENT);
g_type_ensure (GDK_TYPE_PROXIMITY_EVENT);
g_type_ensure (GDK_TYPE_SCROLL_EVENT);
g_type_ensure (GDK_TYPE_TOUCH_EVENT);
g_type_ensure (GDK_TYPE_TOUCHPAD_EVENT);
}
/*< private >
* gdk_event_init_types:
*
* Initializes all GdkEvent types.
*/
void
gdk_event_init_types (void)
{
static gsize event_types__volatile;
if (g_once_init_enter (&event_types__volatile))
{
gboolean initialized = FALSE;
gdk_event_init_types_once ();
initialized = TRUE;
g_once_init_leave (&event_types__volatile, initialized);
}
}
#ifdef G_ENABLE_DEBUG
static gboolean
check_event_sanity (GdkEvent *event)
{
if (event->device != NULL &&
gdk_surface_get_display (event->surface) != gdk_device_get_display (event->device))
{
char *type = g_enum_to_string (GDK_TYPE_EVENT_TYPE, event->event_type);
g_warning ("Event of type %s with mismatched device display", type);
g_free (type);
return FALSE;
}
return TRUE;
}
#endif
void
_gdk_event_emit (GdkEvent *event)
{
#ifdef G_ENABLE_DEBUG
if (!check_event_sanity (event))
return;
#endif
if (gdk_drag_handle_source_event (event))
return;
gdk_surface_handle_event (event);
}
/*********************************************
* Functions for maintaining the event queue *
*********************************************/
/**
* _gdk_event_queue_find_first:
* @display: a `GdkDisplay`
*
* Find the first event on the queue that is not still
* being filled in.
*
* Returns: (nullable): Pointer to the list node for that event
*/
GList*
_gdk_event_queue_find_first (GdkDisplay *display)
{
GList *tmp_list;
GList *pending_motion = NULL;
gboolean paused = display->event_pause_count > 0;
tmp_list = g_queue_peek_head_link (&display->queued_events);
while (tmp_list)
{
GdkEvent *event = tmp_list->data;
if ((event->flags & GDK_EVENT_PENDING) == 0 &&
(!paused || (event->flags & GDK_EVENT_FLUSHED) != 0))
{
if (pending_motion)
return pending_motion;
if ((event->event_type == GDK_MOTION_NOTIFY ||
(event->event_type == GDK_SCROLL && gdk_scroll_event_get_direction (event) == GDK_SCROLL_SMOOTH)) &&
(event->flags & GDK_EVENT_FLUSHED) == 0)
pending_motion = tmp_list;
else
return tmp_list;
}
tmp_list = tmp_list->next;
}
return NULL;
}
/**
* _gdk_event_queue_append:
* @display: a `GdkDisplay`
* @event: Event to append
*
* Appends an event onto the tail of the event queue.
*
* Returns: the newly appended list node.
*/
GList *
_gdk_event_queue_append (GdkDisplay *display,
GdkEvent *event)
{
g_queue_push_tail (&display->queued_events, event);
return g_queue_peek_tail_link (&display->queued_events);
}
/*
* _gdk_event_queue_remove_link:
* @display: a `GdkDisplay`
* @node: node to remove
*
* Removes a specified list node from the event queue.
*/
void
_gdk_event_queue_remove_link (GdkDisplay *display,
GList *node)
{
g_queue_unlink (&display->queued_events, node);
}
/*
* _gdk_event_unqueue:
* @display: a `GdkDisplay`
*
* Removes and returns the first event from the event
* queue that is not still being filled in.
*
* Returns: (nullable): the event
*/
GdkEvent*
_gdk_event_unqueue (GdkDisplay *display)
{
GdkEvent *event = NULL;
GList *tmp_list;
tmp_list = _gdk_event_queue_find_first (display);
if (tmp_list)
{
event = tmp_list->data;
_gdk_event_queue_remove_link (display, tmp_list);
g_list_free_1 (tmp_list);
}
return event;
}
/*
* If the last N events in the event queue are smooth scroll events
* for the same surface, the same device and the same scroll unit,
* combine them into one.
*
* We give the remaining event a history with N items, and deltas
* that are the sum over the history entries.
*/
void
gdk_event_queue_handle_scroll_compression (GdkDisplay *display)
{
GList *l;
GdkSurface *surface = NULL;
GdkDevice *device = NULL;
GList *scrolls = NULL;
GArray *history = NULL;
GdkScrollUnit scroll_unit = GDK_SCROLL_UNIT_WHEEL;
gboolean scroll_unit_defined = FALSE;
GdkTimeCoord hist;
l = g_queue_peek_tail_link (&display->queued_events);
while (l)
{
GdkEvent *event = l->data;
GdkScrollEvent *scroll_event = (GdkScrollEvent *) event;
if (event->flags & GDK_EVENT_PENDING)
break;
if (event->event_type != GDK_SCROLL ||
gdk_scroll_event_get_direction (event) != GDK_SCROLL_SMOOTH)
break;
if (surface != NULL &&
surface != event->surface)
break;
if (device != NULL &&
device != event->device)
break;
if (scroll_unit_defined &&
scroll_unit != scroll_event->unit)
break;
surface = event->surface;
device = event->device;
scroll_unit = scroll_event->unit;
scroll_unit_defined = TRUE;
scrolls = l;
l = l->prev;
}
while (scrolls && scrolls->next != NULL)
{
GdkEvent *event = scrolls->data;
GList *next = scrolls->next;
double dx, dy;
gboolean inherited = FALSE;
if (!history && ((GdkScrollEvent *)event)->history)
{
history = ((GdkScrollEvent *)event)->history;
((GdkScrollEvent *)event)->history = NULL;
inherited = TRUE;
}
if (!history)
history = g_array_new (FALSE, TRUE, sizeof (GdkTimeCoord));
if (!inherited)
{
gdk_scroll_event_get_deltas (event, &dx, &dy);
memset (&hist, 0, sizeof (GdkTimeCoord));
hist.time = gdk_event_get_time (event);
hist.flags = GDK_AXIS_FLAG_DELTA_X | GDK_AXIS_FLAG_DELTA_Y;
hist.axes[GDK_AXIS_DELTA_X] = dx;
hist.axes[GDK_AXIS_DELTA_Y] = dy;
g_array_append_val (history, hist);
}
gdk_event_unref (event);
g_queue_delete_link (&display->queued_events, scrolls);
scrolls = next;
}
if (scrolls && history)
{
GdkEvent *old_event, *event;
double dx, dy;
old_event = scrolls->data;
gdk_scroll_event_get_deltas (old_event, &dx, &dy);
memset (&hist, 0, sizeof (GdkTimeCoord));
hist.time = gdk_event_get_time (old_event);
hist.flags = GDK_AXIS_FLAG_DELTA_X | GDK_AXIS_FLAG_DELTA_Y;
hist.axes[GDK_AXIS_DELTA_X] = dx;
hist.axes[GDK_AXIS_DELTA_Y] = dy;
g_array_append_val (history, hist);
dx = dy = 0;
for (int i = 0; i < history->len; i++)
{
GdkTimeCoord *val = &g_array_index (history, GdkTimeCoord, i);
dx += val->axes[GDK_AXIS_DELTA_X];
dy += val->axes[GDK_AXIS_DELTA_Y];
}
event = gdk_scroll_event_new (surface,
device,
gdk_event_get_device_tool (old_event),
gdk_event_get_time (old_event),
gdk_event_get_modifier_state (old_event),
dx,
dy,
gdk_scroll_event_is_stop (old_event),
scroll_unit);
((GdkScrollEvent *)event)->history = history;
g_queue_delete_link (&display->queued_events, scrolls);
g_queue_push_tail (&display->queued_events, event);
gdk_event_unref (old_event);
}
}
static void
gdk_motion_event_push_history (GdkEvent *event,
GdkEvent *history_event)
{
GdkMotionEvent *self = (GdkMotionEvent *) event;
GdkDeviceTool *tool;
GdkTimeCoord hist;
int i;
g_assert (GDK_IS_EVENT_TYPE (event, GDK_MOTION_NOTIFY));
g_assert (GDK_IS_EVENT_TYPE (history_event, GDK_MOTION_NOTIFY));
if (G_UNLIKELY (!self->history))
self->history = g_array_new (FALSE, TRUE, sizeof (GdkTimeCoord));
if (((GdkMotionEvent *)history_event)->history)
{
GArray *history = ((GdkMotionEvent *)history_event)->history;
g_array_append_vals (self->history, history->data, history->len);
}
tool = gdk_event_get_device_tool (history_event);
memset (&hist, 0, sizeof (GdkTimeCoord));
hist.time = gdk_event_get_time (history_event);
if (tool)
{
hist.flags = gdk_device_tool_get_axes (tool);
for (i = GDK_AXIS_X; i < GDK_AXIS_LAST; i++)
gdk_event_get_axis (history_event, i, &hist.axes[i]);
}
/* GdkTimeCoord has no dedicated fields to record event position. For plain
* pointer events, and for tools which don't report GDK_AXIS_X/GDK_AXIS_Y
* on their own, we surface the position using the X and Y input axes.
*/
if (!(hist.flags & GDK_AXIS_FLAG_X) || !(hist.flags & GDK_AXIS_FLAG_Y))
{
hist.flags |= GDK_AXIS_FLAG_X | GDK_AXIS_FLAG_Y;
gdk_event_get_position (history_event, &hist.axes[GDK_AXIS_X], &hist.axes[GDK_AXIS_Y]);
}
g_array_append_val (self->history, hist);
}
/* If the last N events in the event queue are motion notify
* events for the same surface, drop all but the last.
*
* If a button is held down or the device has a tool, then
* we give the remaining events a history containing the N-1
* dropped events.
*/
void
_gdk_event_queue_handle_motion_compression (GdkDisplay *display)
{
GList *tmp_list;
GList *pending_motions = NULL;
GdkSurface *pending_motion_surface = NULL;
GdkDevice *pending_motion_device = NULL;
GdkEvent *last_motion = NULL;
tmp_list = g_queue_peek_tail_link (&display->queued_events);
while (tmp_list)
{
GdkEvent *event = tmp_list->data;
if (event->flags & GDK_EVENT_PENDING)
break;
if (event->event_type != GDK_MOTION_NOTIFY)
break;
if (pending_motion_surface != NULL &&
pending_motion_surface != event->surface)
break;
if (pending_motion_device != NULL &&
pending_motion_device != event->device)
break;
if (!last_motion)
last_motion = event;
pending_motion_surface = event->surface;
pending_motion_device = event->device;
pending_motions = tmp_list;
tmp_list = tmp_list->prev;
}
while (pending_motions && pending_motions->next != NULL)
{
GList *next = pending_motions->next;
if (last_motion != NULL)
{
if ((gdk_event_get_modifier_state (last_motion) &
(GDK_BUTTON1_MASK | GDK_BUTTON2_MASK | GDK_BUTTON3_MASK |
GDK_BUTTON4_MASK | GDK_BUTTON5_MASK)) ||
gdk_event_get_device_tool (last_motion) != NULL)
gdk_motion_event_push_history (last_motion, pending_motions->data);
}
gdk_event_unref (pending_motions->data);
g_queue_delete_link (&display->queued_events, pending_motions);
pending_motions = next;
}
}
void
_gdk_event_queue_flush (GdkDisplay *display)
{
while (TRUE)
{
GdkEvent *event;
event = (GdkEvent *)g_queue_pop_head (&display->queued_events);
if (!event)
return;
event->flags |= GDK_EVENT_FLUSHED;
_gdk_event_emit (event);
gdk_event_unref (event);
}
}
/**
* gdk_event_ref:
* @event: a `GdkEvent`
*
* Increase the ref count of @event.
*
* Returns: (transfer full): @event
*/
GdkEvent *
gdk_event_ref (GdkEvent *event)
{
g_return_val_if_fail (GDK_IS_EVENT (event), NULL);
g_ref_count_inc (&event->ref_count);
return event;
}
/**
* gdk_event_unref:
* @event: (transfer full): a `GdkEvent`
*
* Decrease the ref count of @event.
*
* If the last reference is dropped, the structure is freed.
*/
void
gdk_event_unref (GdkEvent *event)
{
g_return_if_fail (GDK_IS_EVENT (event));
if (g_ref_count_dec (&event->ref_count))
GDK_EVENT_GET_CLASS (event)->finalize (event);
}
/**
* gdk_event_get_pointer_emulated:
* @event: a `GdkEvent`
*
* Returns whether this event is an 'emulated' pointer event.
*
* Emulated pointer events typically originate from a touch events.
*
* Returns: %TRUE if this event is emulated
*/
gboolean
gdk_event_get_pointer_emulated (GdkEvent *event)
{
switch ((int) event->event_type)
{
case GDK_TOUCH_BEGIN:
case GDK_TOUCH_END:
case GDK_TOUCH_UPDATE:
case GDK_TOUCH_CANCEL:
{
GdkTouchEvent *tevent = (GdkTouchEvent *) event;
return tevent->pointer_emulated;
}
default:
break;
}
return FALSE;
}
/**
* gdk_event_get_axis:
* @event: a `GdkEvent`
* @axis_use: the axis use to look for
* @value: (out): location to store the value found
*
* Extract the axis value for a particular axis use from
* an event structure.
*
* To find out which axes are used, use [[email protected]_axes]
* on the device tool returned by [[email protected]_device_tool].
*
* Returns: %TRUE if the specified axis was found, otherwise %FALSE
*/
gboolean
gdk_event_get_axis (GdkEvent *event,
GdkAxisUse axis_use,
double *value)
{
double *axes;
guint n_axes;
g_return_val_if_fail (GDK_IS_EVENT (event), FALSE);
if (axis_use == GDK_AXIS_X || axis_use == GDK_AXIS_Y)
{
double x, y;
if (!gdk_event_get_position (event, &x, &y))
return FALSE;
if (axis_use == GDK_AXIS_X && value != NULL)
*value = x;
if (axis_use == GDK_AXIS_Y && value != NULL)
*value = y;
return TRUE;
}
if (!gdk_event_get_axes (event, &axes, &n_axes))
return FALSE;
*value = axes[axis_use];
return TRUE;
}
/**
* gdk_event_triggers_context_menu:
* @event: a `GdkEvent`, currently only button events are meaningful values
*
* Returns whether a `GdkEvent` should trigger a context menu,
* according to platform conventions.
*
* The right mouse button typically triggers context menus.
*
* This function should always be used instead of simply checking for
* event->button == %GDK_BUTTON_SECONDARY.
*
* Returns: %TRUE if the event should trigger a context menu.
*/
gboolean
gdk_event_triggers_context_menu (GdkEvent *event)
{
g_return_val_if_fail (event != NULL, FALSE);
if (event->event_type == GDK_BUTTON_PRESS)
{
GdkButtonEvent *bevent = (GdkButtonEvent *) event;
g_return_val_if_fail (GDK_IS_SURFACE (event->surface), FALSE);
if (bevent->button == GDK_BUTTON_SECONDARY &&
! (bevent->state & (GDK_BUTTON1_MASK | GDK_BUTTON2_MASK)))
return TRUE;