add touchpad device to Frame for switching between capacitive and resistive modes

2 files changed, 133 insertions, 0 deletions

diff --git a/extensions/deviceicon/Makefile.am b/extensions/deviceicon/Makefile.am
index 8a2e765..d46ddde 100644
--- a/extensions/deviceicon/Makefile.am
+++ b/extensions/deviceicon/Makefile.am
@@ -5,4 +5,5 @@ sugar_PYTHON = 		\
 	battery.py	\
 	network.py	\
 	speaker.py	\
+	touchpad.py     \
 	volume.py
diff --git a/extensions/deviceicon/touchpad.py b/extensions/deviceicon/touchpad.py
new file mode 100644
index 0000000..d9521c2
--- /dev/null
+++ b/extensions/deviceicon/touchpad.py
@@ -0,0 +1,132 @@
+# Copyright (C) 2010, Walter Bender, Sugar Labs
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+
+from gettext import gettext as _
+import os
+
+import gtk
+import gconf
+
+import logging
+
+from sugar.graphics.tray import TrayIcon
+from sugar.graphics.xocolor import XoColor
+from sugar.graphics.palette import Palette
+from sugar.graphics import style
+
+from jarabe.frame.frameinvoker import FrameWidgetInvoker
+
+TOUCHPAD_MODE_CAPACITIVE = 'capacitive'
+TOUCHPAD_MODE_RESISTIVE = 'resistive'
+TOUCHPAD_MODES = [TOUCHPAD_MODE_CAPACITIVE, TOUCHPAD_MODE_RESISTIVE]
+STATUS_TEXT = {TOUCHPAD_MODE_CAPACITIVE: _('finger'),
+               TOUCHPAD_MODE_RESISTIVE: _('stylus')}
+STATUS_ICON = {TOUCHPAD_MODE_CAPACITIVE: 'touchpad-' + TOUCHPAD_MODE_CAPACITIVE,
+               TOUCHPAD_MODE_RESISTIVE: 'touchpad-' + TOUCHPAD_MODE_RESISTIVE}
+# NODE_PATH is used to communicate with the touchpad device.
+NODE_PATH = '/sys/devices/platform/i8042/serio1/ptmode'
+
+
+class DeviceView(TrayIcon):
+    """ Manage the touchpad mode from the device palette on the Frame. """
+
+    FRAME_POSITION_RELATIVE = 500
+
+    def __init__(self):
+        """ Create the icon that represents the touchpad. """
+        icon_name = STATUS_ICON[_read_touchpad_mode()]
+
+        client = gconf.client_get_default()
+        color = XoColor(client.get_string('/desktop/sugar/user/color'))
+        TrayIcon.__init__(self, icon_name=icon_name, xo_color=color)
+
+        self.set_palette_invoker(FrameWidgetInvoker(self))
+        self.connect('button-release-event', self.__button_release_event_cb)
+
+    def create_palette(self):
+        """ Create a palette for this icon; called by the Sugar framework
+        when a palette needs to be displayed. """
+        self.palette = ResourcePalette(_('My touchpad'), self.icon)
+        self.palette.set_group_id('frame')
+        return self.palette
+
+    def __button_release_event_cb(self, widget, event):
+        """ Callback for button release event; used to invoke touchpad-mode
+        change. """
+        self.palette.toggle_mode()
+        return True
+
+
+class ResourcePalette(Palette):
+    """ Palette attached to the decive icon that represents the touchpas. """
+
+    def __init__(self, primary_text, icon):
+        """ Create the palette and initilize with current touchpad status. """
+        Palette.__init__(self, label=primary_text)
+
+        self._icon = icon
+
+        vbox = gtk.VBox()
+        self.set_content(vbox)
+
+        self._status_text = gtk.Label()
+        vbox.pack_start(self._status_text, padding=style.DEFAULT_PADDING)
+        self._status_text.show()
+
+        vbox.show()
+
+        self._mode = _read_touchpad_mode()
+        self._update()
+
+    def _update(self):
+        """ Update the label and icon based on the current mode. """
+        self._status_text.set_label(STATUS_TEXT[self._mode])
+        self._icon.props.icon_name = STATUS_ICON[self._mode]
+
+    def toggle_mode(self):
+        """ Toggle the touchpad mode. """
+        self._mode = TOUCHPAD_MODES[1 - TOUCHPAD_MODES.index(self._mode)]
+        _write_touchpad_mode(self._mode)
+        self._update()
+
+
+def setup(tray):
+    """ Initialize the devic icon; called by the shell when initializing the
+    Frame. """
+    if os.path.exists(NODE_PATH):
+        tray.add_device(DeviceView())
+        _write_touchpad_mode(TOUCHPAD_MODE_CAPACITIVE)
+
+
+def _read_touchpad_mode():
+    """ Read the touchpad mode from the node path. """
+    node_file_handle = open(NODE_PATH, 'r')
+    text = node_file_handle.read()
+    node_file_handle.close()
+
+    return TOUCHPAD_MODES[int(text[0])]
+
+
+def _write_touchpad_mode(touchpad):
+    """ Write the touchpad mode to the node path. """
+    try:
+        node_file_handle = open(NODE_PATH, 'w')
+    except IOError, e:
+        logging.error('Error opening %s for writing: %s', NODE_PATH, e)
+        return
+    node_file_handle.write(str(TOUCHPAD_MODES.index(touchpad)))
+    node_file_handle.close()