| 1 | /* |
| 2 | * Copyright (C) 2012 One laptop per child |
| 3 | * |
| 4 | * This library is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU Lesser General Public |
| 6 | * License as published by the Free Software Foundation; either |
| 7 | * version 2 of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * This library is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | * Lesser General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU Lesser General Public |
| 15 | * License along with this library; if not, write to the |
| 16 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 17 | * Boston, MA 02111-1307, USA. |
| 18 | * |
| 19 | * Author: Simon Schampijer <simon@laptop.org> |
| 20 | */ |
| 21 | |
| 22 | #include <gdk/gdkx.h> |
| 23 | #include <X11/extensions/XInput2.h> |
| 24 | #include "sugar-cursor-tracker.h" |
| 25 | |
| 26 | typedef struct _SugarCursorTrackerPriv SugarCursorTrackerPriv; |
| 27 | |
| 28 | struct _SugarCursorTrackerPriv |
| 29 | { |
| 30 | GdkWindow *root_window; |
| 31 | gboolean cursor_shown; |
| 32 | }; |
| 33 | |
| 34 | G_DEFINE_TYPE (SugarCursorTracker, sugar_cursor_tracker, G_TYPE_OBJECT) |
| 35 | |
| 36 | |
| 37 | static void |
| 38 | sugar_cursor_tracker_finalize (GObject *object) |
| 39 | { |
| 40 | SugarCursorTrackerPriv *priv = SUGAR_CURSOR_TRACKER (object)->_priv; |
| 41 | |
| 42 | G_OBJECT_CLASS (sugar_cursor_tracker_parent_class)->finalize (object); |
| 43 | } |
| 44 | |
| 45 | static void |
| 46 | sugar_cursor_tracker_class_init (SugarCursorTrackerClass *klass) |
| 47 | { |
| 48 | GObjectClass *object_class = G_OBJECT_CLASS (klass); |
| 49 | |
| 50 | object_class->finalize = sugar_cursor_tracker_finalize; |
| 51 | |
| 52 | g_type_class_add_private (klass, sizeof (SugarCursorTrackerPriv)); |
| 53 | } |
| 54 | |
| 55 | static GdkWindow * |
| 56 | _get_default_root_window (void) |
| 57 | { |
| 58 | GdkDisplay *display; |
| 59 | GdkScreen *screen; |
| 60 | |
| 61 | display = gdk_display_get_default (); |
| 62 | screen = gdk_display_get_default_screen (display); |
| 63 | |
| 64 | return gdk_screen_get_root_window (screen); |
| 65 | } |
| 66 | |
| 67 | static void |
| 68 | _track_raw_events (GdkWindow *window) |
| 69 | { |
| 70 | XIEventMask mask; |
| 71 | guchar *evmask; |
| 72 | GdkDisplay *display; |
| 73 | |
| 74 | evmask = g_new0 (guchar, XIMaskLen (XI_LASTEVENT)); |
| 75 | XISetMask (evmask, XI_RawTouchBegin); |
| 76 | XISetMask (evmask, XI_RawTouchEnd); |
| 77 | XISetMask (evmask, XI_RawTouchUpdate); |
| 78 | XISetMask (evmask, XI_RawMotion); |
| 79 | XISetMask (evmask, XI_RawButtonPress); |
| 80 | |
| 81 | mask.deviceid = XIAllMasterDevices; |
| 82 | mask.mask_len = sizeof (evmask); |
| 83 | mask.mask = evmask; |
| 84 | |
| 85 | display = gdk_window_get_display (window); |
| 86 | XISelectEvents (gdk_x11_display_get_xdisplay (display), |
| 87 | gdk_x11_window_get_xid (window), |
| 88 | &mask, 1); |
| 89 | } |
| 90 | |
| 91 | static void |
| 92 | _set_cursor_visibility (SugarCursorTracker *tracker, |
| 93 | gboolean visible) |
| 94 | { |
| 95 | GdkDisplay *display; |
| 96 | Display *xdisplay; |
| 97 | SugarCursorTrackerPriv *priv; |
| 98 | |
| 99 | priv = tracker->_priv; |
| 100 | display = gdk_display_get_default (); |
| 101 | xdisplay = GDK_DISPLAY_XDISPLAY (display); |
| 102 | |
| 103 | gdk_error_trap_push (); |
| 104 | |
| 105 | if (visible == TRUE) { |
| 106 | if (priv->cursor_shown == FALSE) { |
| 107 | XFixesShowCursor (xdisplay, GDK_WINDOW_XID (_get_default_root_window ())); |
| 108 | priv->cursor_shown = TRUE; |
| 109 | } |
| 110 | } |
| 111 | else { |
| 112 | if (priv->cursor_shown == TRUE) { |
| 113 | XFixesHideCursor (xdisplay, GDK_WINDOW_XID (_get_default_root_window ())); |
| 114 | priv->cursor_shown = False; |
| 115 | } |
| 116 | } |
| 117 | |
| 118 | if (gdk_error_trap_pop ()) { |
| 119 | g_warning ("An error occurred trying to %s the cursor", |
| 120 | FALSE ? "show" : "hide"); |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | static GdkFilterReturn |
| 125 | filter_function (GdkXEvent *xevent, |
| 126 | GdkEvent *gdkevent, |
| 127 | gpointer user_data) |
| 128 | { |
| 129 | XEvent *ev = xevent; |
| 130 | XIEvent *xiev; |
| 131 | SugarCursorTracker *tracker; |
| 132 | |
| 133 | if (ev->type != GenericEvent) |
| 134 | return GDK_FILTER_CONTINUE; |
| 135 | |
| 136 | tracker = user_data; |
| 137 | |
| 138 | xiev = ev->xcookie.data; |
| 139 | |
| 140 | switch (xiev->evtype) { |
| 141 | case XI_RawTouchBegin: |
| 142 | _set_cursor_visibility (tracker, FALSE); |
| 143 | return GDK_FILTER_REMOVE; |
| 144 | case XI_RawMotion: |
| 145 | _set_cursor_visibility (tracker, TRUE); |
| 146 | return GDK_FILTER_REMOVE; |
| 147 | case XI_RawButtonPress: |
| 148 | _set_cursor_visibility (tracker, TRUE); |
| 149 | return GDK_FILTER_REMOVE; |
| 150 | default: |
| 151 | return GDK_FILTER_CONTINUE; |
| 152 | } |
| 153 | } |
| 154 | |
| 155 | static void |
| 156 | sugar_cursor_tracker_init (SugarCursorTracker *tracker) |
| 157 | { |
| 158 | SugarCursorTrackerPriv *priv; |
| 159 | tracker->_priv = priv = G_TYPE_INSTANCE_GET_PRIVATE (tracker, |
| 160 | SUGAR_TYPE_CURSOR_TRACKER, |
| 161 | SugarCursorTrackerPriv); |
| 162 | priv->root_window = _get_default_root_window (); |
| 163 | priv->cursor_shown = True; |
| 164 | |
| 165 | tracker->_priv = priv = G_TYPE_INSTANCE_GET_PRIVATE (tracker, |
| 166 | SUGAR_TYPE_CURSOR_TRACKER, |
| 167 | SugarCursorTrackerPriv); |
| 168 | priv->root_window = _get_default_root_window (); |
| 169 | _track_raw_events (priv->root_window); |
| 170 | gdk_window_add_filter (NULL, filter_function, tracker); |
| 171 | } |
| 172 | |
| 173 | SugarCursorTracker * |
| 174 | sugar_cursor_tracker_new (void) |
| 175 | { |
| 176 | return g_object_new (SUGAR_TYPE_CURSOR_TRACKER, NULL); |
| 177 | } |