sugarlabs/sugar-toolkit-gtk3
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Cursor tracker: only display the cursor in mouse/trackpad mode

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Listen on RawEvents: listen for raw events on the root
window and decide whether the cursor is shown or not. A
touch begin event will hide the cursor a motion or button
press event will show it.

There is no API in XFixes to know whether a cursor is shown
or not so we keep track of the current state. Furthermore
we trap X errors if any bad access should happen.

Signed-off-by: Simon Schampijer <simon@laptop.org>
Reviewed-by: Carlos Garnacho <carlos@lanedo.com>
Acked-by: Manuel Quiñones <manuq@laptop.org>
This commit is contained in:
Simon Schampijer 2012-10-11 15:12:49 +02:00
parent 977e5fc4db
commit f91cfbfc8a
3 changed files with 235 additions and 0 deletions
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4
src/sugar3/Makefile.am
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@ -47,6 +47,8 @@ libsugarext_la_SOURCES = \
gsm-xsmp.h \
sugar-grid.c \
sugar-grid.h \
sugar-cursor-tracker.c \
sugar-cursor-tracker.h \
sugar-gesture-grabber.c \
sugar-gesture-grabber.h \
sugar-key-grabber.c \
@ -128,6 +130,8 @@ SugarExt_1_0_gir_FILES = \
gsm-session.h \
gsm-xsmp.c \
gsm-xsmp.h \
sugar-cursor-tracker.c \
sugar-cursor-tracker.h \
sugar-gesture-grabber.c \
sugar-gesture-grabber.h \
sugar-key-grabber.c \

177
src/sugar3/sugar-cursor-tracker.c Normal file
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@ -0,0 +1,177 @@
/*
* Copyright (C) 2012 One laptop per child
*
* 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.
*
* Author: Simon Schampijer <simon@laptop.org>
*/
#include <gdk/gdkx.h>
#include <X11/extensions/XInput2.h>
#include "sugar-cursor-tracker.h"
typedef struct _SugarCursorTrackerPriv SugarCursorTrackerPriv;
struct _SugarCursorTrackerPriv
{
GdkWindow *root_window;
gboolean cursor_shown;
};
G_DEFINE_TYPE (SugarCursorTracker, sugar_cursor_tracker, G_TYPE_OBJECT)
static void
sugar_cursor_tracker_finalize (GObject *object)
{
SugarCursorTrackerPriv *priv = SUGAR_CURSOR_TRACKER (object)->_priv;
G_OBJECT_CLASS (sugar_cursor_tracker_parent_class)->finalize (object);
}
static void
sugar_cursor_tracker_class_init (SugarCursorTrackerClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->finalize = sugar_cursor_tracker_finalize;
g_type_class_add_private (klass, sizeof (SugarCursorTrackerPriv));
}
static GdkWindow *
_get_default_root_window (void)
{
GdkDisplay *display;
GdkScreen *screen;
display = gdk_display_get_default ();
screen = gdk_display_get_default_screen (display);
return gdk_screen_get_root_window (screen);
}
static void
_track_raw_events (GdkWindow *window)
{
XIEventMask mask;
guchar *evmask;
GdkDisplay *display;
evmask = g_new0 (guchar, XIMaskLen (XI_LASTEVENT));
XISetMask (evmask, XI_RawTouchBegin);
XISetMask (evmask, XI_RawTouchEnd);
XISetMask (evmask, XI_RawTouchUpdate);
XISetMask (evmask, XI_RawMotion);
XISetMask (evmask, XI_RawButtonPress);
mask.deviceid = XIAllMasterDevices;
mask.mask_len = sizeof (evmask);
mask.mask = evmask;
display = gdk_window_get_display (window);
XISelectEvents (gdk_x11_display_get_xdisplay (display),
gdk_x11_window_get_xid (window),
&mask, 1);
}
static void
_set_cursor_visibility (SugarCursorTracker *tracker,
gboolean visible)
{
GdkDisplay *display;
Display *xdisplay;
SugarCursorTrackerPriv *priv;
priv = tracker->_priv;
display = gdk_display_get_default ();
xdisplay = GDK_DISPLAY_XDISPLAY (display);
gdk_error_trap_push ();
if (visible == TRUE) {
if (priv->cursor_shown == FALSE) {
XFixesShowCursor (xdisplay, GDK_WINDOW_XID (_get_default_root_window ()));
priv->cursor_shown = TRUE;
}
}
else {
if (priv->cursor_shown == TRUE) {
XFixesHideCursor (xdisplay, GDK_WINDOW_XID (_get_default_root_window ()));
priv->cursor_shown = False;
}
}
if (gdk_error_trap_pop ()) {
g_warning ("An error occurred trying to %s the cursor",
FALSE ? "show" : "hide");
}
}
static GdkFilterReturn
filter_function (GdkXEvent *xevent,
GdkEvent *gdkevent,
gpointer user_data)
{
XEvent *ev = xevent;
XIEvent *xiev;
SugarCursorTracker *tracker;
if (ev->type != GenericEvent)
return GDK_FILTER_CONTINUE;
tracker = user_data;
xiev = ev->xcookie.data;
switch (xiev->evtype) {
case XI_RawTouchBegin:
_set_cursor_visibility (tracker, FALSE);
return GDK_FILTER_REMOVE;
case XI_RawMotion:
_set_cursor_visibility (tracker, TRUE);
return GDK_FILTER_REMOVE;
case XI_RawButtonPress:
_set_cursor_visibility (tracker, TRUE);
return GDK_FILTER_REMOVE;
default:
return GDK_FILTER_CONTINUE;
}
}
static void
sugar_cursor_tracker_init (SugarCursorTracker *tracker)
{
SugarCursorTrackerPriv *priv;
tracker->_priv = priv = G_TYPE_INSTANCE_GET_PRIVATE (tracker,
SUGAR_TYPE_CURSOR_TRACKER,
SugarCursorTrackerPriv);
priv->root_window = _get_default_root_window ();
priv->cursor_shown = True;
tracker->_priv = priv = G_TYPE_INSTANCE_GET_PRIVATE (tracker,
SUGAR_TYPE_CURSOR_TRACKER,
SugarCursorTrackerPriv);
priv->root_window = _get_default_root_window ();
_track_raw_events (priv->root_window);
gdk_window_add_filter (NULL, filter_function, tracker);
}
SugarCursorTracker *
sugar_cursor_tracker_new (void)
{
return g_object_new (SUGAR_TYPE_CURSOR_TRACKER, NULL);
}

54
src/sugar3/sugar-cursor-tracker.h Normal file
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@ -0,0 +1,54 @@
/*
* Copyright (C) 2012 One laptop per child
*
* 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.
*
* Author: Simon Schampijer <simon@laptop.org>
*/
#ifndef __SUGAR_CURSOR_TRACKER_H__
#define __SUGAR_CURSOR_TRACKER_H__
#include <gtk/gtk.h>
#include "event-controller/sugar-event-controllers.h"
G_BEGIN_DECLS
typedef struct _SugarCursorTracker SugarCursorTracker;
typedef struct _SugarCursorTrackerClass SugarCursorTrackerClass;
#define SUGAR_TYPE_CURSOR_TRACKER (sugar_cursor_tracker_get_type())
#define SUGAR_CURSOR_TRACKER(object) (G_TYPE_CHECK_INSTANCE_CAST((object), SUGAR_TYPE_CURSOR_TRACKER, SugarCursorTracker))
#define SUGAR_CURSOR_TRACKER_CLASS(klass) (G_TYPE_CHACK_CLASS_CAST((klass), SUGAR_TYPE_CURSOR_TRACKER, SugarCursorTrackerClass))
#define SUGAR_IS_CURSOR_TRACKER(object) (G_TYPE_CHECK_INSTANCE_TYPE((object), SUGAR_TYPE_CURSOR_TRACKER))
#define SUGAR_IS_CURSOR_TRACKER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass), SUGAR_TYPE_CURSOR_TRACKER))
#define SUGAR_CURSOR_TRACKER_GET_CLASS(object) (G_TYPE_INSTANCE_GET_CLASS((object), SUGAR_TYPE_CURSOR_TRACKER, SugarCursorTrackerClass))
struct _SugarCursorTracker {
GObject parent_instance;
gpointer _priv;
};
struct _SugarCursorTrackerClass {
GObjectClass parent_class;
};
GType sugar_cursor_tracker_get_type (void);
SugarCursorTracker * sugar_cursor_tracker_new (void);
G_END_DECLS
#endif /* __SUGAR_CURSOR_TRACKER_H__ */