gtk2/gdk/gdkevents.c
2000-03-28 01:24:44 +00:00

636 lines
15 KiB
C

/* 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 Library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library 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.
*/
/*
* Modified by the GTK+ Team and others 1997-1999. 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 "gdk.h"
#include "gdkinternals.h"
typedef struct _GdkIOClosure GdkIOClosure;
typedef struct _GdkEventPrivate GdkEventPrivate;
#define DOUBLE_CLICK_TIME 250
#define TRIPLE_CLICK_TIME 500
#define DOUBLE_CLICK_DIST 5
#define TRIPLE_CLICK_DIST 5
typedef enum
{
/* Following flag is set for events on the event queue during
* translation and cleared afterwards.
*/
GDK_EVENT_PENDING = 1 << 0
} GdkEventFlags;
struct _GdkIOClosure
{
GdkInputFunction function;
GdkInputCondition condition;
GdkDestroyNotify notify;
gpointer data;
};
struct _GdkEventPrivate
{
GdkEvent event;
guint flags;
};
/*
* Private function declarations
*/
GdkFilterReturn gdk_wm_protocols_filter (GdkXEvent *xev,
GdkEvent *event,
gpointer data);
/* Private variable declarations
*/
static guint32 button_click_time[2] = { 0, 0}; /* The last 2 button click times. Used
* to determine if the latest button click
* is part of a double or triple click.
*/
static GdkWindow *button_window[2] = { NULL, NULL}; /* The last 2 windows to receive button presses.
* Also used to determine if the latest button
* click is part of a double or triple click.
*/
static guint button_number[2] = { -1, -1 }; /* The last 2 buttons to be pressed.
*/
GdkEventFunc gdk_event_func = NULL; /* Callback for events */
gpointer gdk_event_data = NULL;
GDestroyNotify gdk_event_notify = NULL;
GPollFD event_poll_fd;
/*********************************************
* Functions for maintaining the event queue *
*********************************************/
/*************************************************************
* gdk_event_queue_find_first:
* Find the first event on the queue that is not still
* being filled in.
* arguments:
*
* results:
* Pointer to the list node for that event, or NULL
*************************************************************/
GList*
gdk_event_queue_find_first (void)
{
GList *tmp_list = gdk_queued_events;
while (tmp_list)
{
GdkEventPrivate *event = tmp_list->data;
if (!(event->flags & GDK_EVENT_PENDING))
return tmp_list;
tmp_list = g_list_next (tmp_list);
}
return NULL;
}
/*************************************************************
* gdk_event_queue_remove_link:
* Remove a specified list node from the event queue.
* arguments:
* node: Node to remove.
* results:
*************************************************************/
void
gdk_event_queue_remove_link (GList *node)
{
if (node->prev)
node->prev->next = node->next;
else
gdk_queued_events = node->next;
if (node->next)
node->next->prev = node->prev;
else
gdk_queued_tail = node->prev;
}
/*************************************************************
* gdk_event_queue_append:
* Append an event onto the tail of the event queue.
* arguments:
* event: Event to append.
* results:
*************************************************************/
void
gdk_event_queue_append (GdkEvent *event)
{
gdk_queued_tail = g_list_append (gdk_queued_tail, event);
if (!gdk_queued_events)
gdk_queued_events = gdk_queued_tail;
else
gdk_queued_tail = gdk_queued_tail->next;
}
/*************************************************************
* gdk_event_handler_set:
*
* arguments:
* func: Callback function to be called for each event.
* data: Data supplied to the function
* notify: function called when function is no longer needed
*
* results:
*************************************************************/
void
gdk_event_handler_set (GdkEventFunc func,
gpointer data,
GDestroyNotify notify)
{
if (gdk_event_notify)
(*gdk_event_notify) (gdk_event_data);
gdk_event_func = func;
gdk_event_data = data;
gdk_event_notify = notify;
}
/*
*--------------------------------------------------------------
* gdk_event_get
*
* Gets the next event.
*
* Arguments:
*
* Results:
* If an event is waiting that we care about, returns
* a pointer to that event, to be freed with gdk_event_free.
* Otherwise, returns NULL.
*
* Side effects:
*
*--------------------------------------------------------------
*/
GdkEvent*
gdk_event_get (void)
{
gdk_events_queue ();
return gdk_event_unqueue ();
}
/*
*--------------------------------------------------------------
* gdk_event_peek
*
* Gets the next event.
*
* Arguments:
*
* Results:
* If an event is waiting that we care about, returns
* a copy of that event, but does not remove it from
* the queue. The pointer is to be freed with gdk_event_free.
* Otherwise, returns NULL.
*
* Side effects:
*
*--------------------------------------------------------------
*/
GdkEvent*
gdk_event_peek (void)
{
GList *tmp_list;
tmp_list = gdk_event_queue_find_first ();
if (tmp_list)
return gdk_event_copy (tmp_list->data);
else
return NULL;
}
void
gdk_event_put (GdkEvent *event)
{
GdkEvent *new_event;
g_return_if_fail (event != NULL);
new_event = gdk_event_copy (event);
gdk_event_queue_append (new_event);
}
/*
*--------------------------------------------------------------
* gdk_event_copy
*
* Copy a event structure into new storage.
*
* Arguments:
* "event" is the event struct to copy.
*
* Results:
* A new event structure. Free it with gdk_event_free.
*
* Side effects:
* The reference count of the window in the event is increased.
*
*--------------------------------------------------------------
*/
static GMemChunk *event_chunk = NULL;
GdkEvent*
gdk_event_new (void)
{
GdkEventPrivate *new_event;
if (event_chunk == NULL)
event_chunk = g_mem_chunk_new ("events",
sizeof (GdkEventPrivate),
4096,
G_ALLOC_AND_FREE);
new_event = g_chunk_new (GdkEventPrivate, event_chunk);
new_event->flags = 0;
return (GdkEvent*) new_event;
}
GdkEvent*
gdk_event_copy (GdkEvent *event)
{
GdkEvent *new_event;
g_return_val_if_fail (event != NULL, NULL);
new_event = gdk_event_new ();
*new_event = *event;
gdk_window_ref (new_event->any.window);
switch (event->any.type)
{
case GDK_KEY_PRESS:
case GDK_KEY_RELEASE:
new_event->key.string = g_strdup (event->key.string);
break;
case GDK_ENTER_NOTIFY:
case GDK_LEAVE_NOTIFY:
if (event->crossing.subwindow != NULL)
gdk_window_ref (event->crossing.subwindow);
break;
case GDK_DRAG_ENTER:
case GDK_DRAG_LEAVE:
case GDK_DRAG_MOTION:
case GDK_DRAG_STATUS:
case GDK_DROP_START:
case GDK_DROP_FINISHED:
gdk_drag_context_ref (event->dnd.context);
break;
default:
break;
}
return new_event;
}
/*
*--------------------------------------------------------------
* gdk_event_free
*
* Free a event structure obtained from gdk_event_copy. Do not use
* with other event structures.
*
* Arguments:
* "event" is the event struct to free.
*
* Results:
*
* Side effects:
* The reference count of the window in the event is decreased and
* might be freed, too.
*
*-------------------------------------------------------------- */
void
gdk_event_free (GdkEvent *event)
{
g_return_if_fail (event != NULL);
g_assert (event_chunk != NULL); /* paranoid */
if (event->any.window)
gdk_window_unref (event->any.window);
switch (event->any.type)
{
case GDK_KEY_PRESS:
case GDK_KEY_RELEASE:
g_free (event->key.string);
break;
case GDK_ENTER_NOTIFY:
case GDK_LEAVE_NOTIFY:
if (event->crossing.subwindow != NULL)
gdk_window_unref (event->crossing.subwindow);
break;
case GDK_DRAG_ENTER:
case GDK_DRAG_LEAVE:
case GDK_DRAG_MOTION:
case GDK_DRAG_STATUS:
case GDK_DROP_START:
case GDK_DROP_FINISHED:
gdk_drag_context_unref (event->dnd.context);
break;
default:
break;
}
g_mem_chunk_free (event_chunk, event);
}
/*
*--------------------------------------------------------------
* gdk_event_get_time:
* Get the timestamp from an event.
* arguments:
* event:
* results:
* The event's time stamp, if it has one, otherwise
* GDK_CURRENT_TIME.
*--------------------------------------------------------------
*/
guint32
gdk_event_get_time (GdkEvent *event)
{
if (event)
switch (event->type)
{
case GDK_MOTION_NOTIFY:
return event->motion.time;
case GDK_BUTTON_PRESS:
case GDK_2BUTTON_PRESS:
case GDK_3BUTTON_PRESS:
case GDK_BUTTON_RELEASE:
case GDK_SCROLL:
return event->button.time;
case GDK_KEY_PRESS:
case GDK_KEY_RELEASE:
return event->key.time;
case GDK_ENTER_NOTIFY:
case GDK_LEAVE_NOTIFY:
return event->crossing.time;
case GDK_PROPERTY_NOTIFY:
return event->property.time;
case GDK_SELECTION_CLEAR:
case GDK_SELECTION_REQUEST:
case GDK_SELECTION_NOTIFY:
return event->selection.time;
case GDK_PROXIMITY_IN:
case GDK_PROXIMITY_OUT:
return event->proximity.time;
case GDK_DRAG_ENTER:
case GDK_DRAG_LEAVE:
case GDK_DRAG_MOTION:
case GDK_DRAG_STATUS:
case GDK_DROP_START:
case GDK_DROP_FINISHED:
return event->dnd.time;
default: /* use current time */
break;
}
return GDK_CURRENT_TIME;
}
/*
*--------------------------------------------------------------
* gdk_set_show_events
*
* Turns on/off the showing of events.
*
* Arguments:
* "show_events" is a boolean describing whether or
* not to show the events gdk receives.
*
* Results:
*
* Side effects:
* When "show_events" is TRUE, calls to "gdk_event_get"
* will output debugging informatin regarding the event
* received to stdout.
*
*--------------------------------------------------------------
*/
void
gdk_set_show_events (gboolean show_events)
{
if (show_events)
gdk_debug_flags |= GDK_DEBUG_EVENTS;
else
gdk_debug_flags &= ~GDK_DEBUG_EVENTS;
}
gboolean
gdk_get_show_events (void)
{
return (gdk_debug_flags & GDK_DEBUG_EVENTS) != 0;
}
static void
gdk_io_destroy (gpointer data)
{
GdkIOClosure *closure = data;
if (closure->notify)
closure->notify (closure->data);
g_free (closure);
}
/* What do we do with G_IO_NVAL?
*/
#define READ_CONDITION (G_IO_IN | G_IO_HUP | G_IO_ERR)
#define WRITE_CONDITION (G_IO_OUT | G_IO_ERR)
#define EXCEPTION_CONDITION (G_IO_PRI)
static gboolean
gdk_io_invoke (GIOChannel *source,
GIOCondition condition,
gpointer data)
{
GdkIOClosure *closure = data;
GdkInputCondition gdk_cond = 0;
if (condition & READ_CONDITION)
gdk_cond |= GDK_INPUT_READ;
if (condition & WRITE_CONDITION)
gdk_cond |= GDK_INPUT_WRITE;
if (condition & EXCEPTION_CONDITION)
gdk_cond |= GDK_INPUT_EXCEPTION;
if (closure->condition & gdk_cond)
closure->function (closure->data, g_io_channel_unix_get_fd (source), gdk_cond);
return TRUE;
}
gint
gdk_input_add_full (gint source,
GdkInputCondition condition,
GdkInputFunction function,
gpointer data,
GdkDestroyNotify destroy)
{
guint result;
GdkIOClosure *closure = g_new (GdkIOClosure, 1);
GIOChannel *channel;
GIOCondition cond = 0;
closure->function = function;
closure->condition = condition;
closure->notify = destroy;
closure->data = data;
if (condition & GDK_INPUT_READ)
cond |= READ_CONDITION;
if (condition & GDK_INPUT_WRITE)
cond |= WRITE_CONDITION;
if (condition & GDK_INPUT_EXCEPTION)
cond |= EXCEPTION_CONDITION;
channel = g_io_channel_unix_new (source);
result = g_io_add_watch_full (channel, G_PRIORITY_DEFAULT, cond,
gdk_io_invoke,
closure, gdk_io_destroy);
g_io_channel_unref (channel);
return result;
}
gint
gdk_input_add (gint source,
GdkInputCondition condition,
GdkInputFunction function,
gpointer data)
{
return gdk_input_add_full (source, condition, function, data, NULL);
}
void
gdk_input_remove (gint tag)
{
g_source_remove (tag);
}
GdkEvent*
gdk_event_unqueue (void)
{
GdkEvent *event = NULL;
GList *tmp_list;
tmp_list = gdk_event_queue_find_first ();
if (tmp_list)
{
event = tmp_list->data;
gdk_event_queue_remove_link (tmp_list);
g_list_free_1 (tmp_list);
}
return event;
}
void
gdk_synthesize_click (GdkEvent *event,
gint nclicks)
{
GdkEvent temp_event;
g_return_if_fail (event != NULL);
temp_event = *event;
temp_event.type = (nclicks == 2) ? GDK_2BUTTON_PRESS : GDK_3BUTTON_PRESS;
gdk_event_put (&temp_event);
}
void
gdk_event_button_generate (GdkEvent *event)
{
if ((event->button.time < (button_click_time[1] + TRIPLE_CLICK_TIME)) &&
(event->button.window == button_window[1]) &&
(event->button.button == button_number[1]))
{
gdk_synthesize_click (event, 3);
button_click_time[1] = 0;
button_click_time[0] = 0;
button_window[1] = NULL;
button_window[0] = 0;
button_number[1] = -1;
button_number[0] = -1;
}
else if ((event->button.time < (button_click_time[0] + DOUBLE_CLICK_TIME)) &&
(event->button.window == button_window[0]) &&
(event->button.button == button_number[0]))
{
gdk_synthesize_click (event, 2);
button_click_time[1] = button_click_time[0];
button_click_time[0] = event->button.time;
button_window[1] = button_window[0];
button_window[0] = event->button.window;
button_number[1] = button_number[0];
button_number[0] = event->button.button;
}
else
{
button_click_time[1] = 0;
button_click_time[0] = event->button.time;
button_window[1] = NULL;
button_window[0] = event->button.window;
button_number[1] = -1;
button_number[0] = event->button.button;
}
}