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# Orca
#
# Copyright 2005 Sun Microsystems Inc.
#
# 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.
"""Provides support for handling input events. This provides several classes
to define input events (InputEvent, KeyboardEvent, BrailleEvent,
MouseButtonEvent, MouseMotionEvent, and SpeechEvent), and also provides a
InputEventHandler class. It is intended that instances of InputEventHandler
will be used which should be used to handle all input events."""
__id__ = "$Id: input_event.py,v 1.13 2006/07/28 17:33:16 wwalker Exp $"
__version__ = "$Revision: 1.13 $"
__date__ = "$Date: 2006/07/28 17:33:16 $"
__copyright__ = "Copyright (c) 2005-2006 Sun Microsystems Inc."
__license__ = "LGPL"
import atspi
import debug
import settings
import time
KEYBOARD_EVENT = "keyboard"
BRAILLE_EVENT = "braille"
MOUSE_BUTTON_EVENT = "mouse:button"
MOUSE_MOTION_EVENT = "mouse:motion"
SPEECH_EVENT = "speech"
class InputEvent:
def __init__(self, type):
"""Creates a new input event of the given type.
Arguments:
- type: the input event type (one of KEYBOARD_EVENT, BRAILLE_EVENT,
MOUSE_BUTTON_EVENT, MOUSE_MOTION_EVENT, SPEECH_EVENT).
"""
self.type = type
class KeyboardEvent(InputEvent):
def __init__(self, event):
"""Creates a new InputEvent of type KEYBOARD_EVENT.
Arguments:
- event: the AT-SPI keyboard event
"""
# Control characters come through as control characters, so we
# just turn them into their ASCII equivalent. NOTE that the
# upper case ASCII characters will be used (e.g., ctrl+a will
# be turned into the string "A"). All these checks here are
# to just do some sanity checking before doing the
# conversion. [[[WDW - this is making assumptions about
# mapping ASCII control characters to to UTF-8.]]]
#
event_string = event.event_string
if (event.modifiers & (1 << atspi.Accessibility.MODIFIER_CONTROL)) \
and (not event.is_text) and (len(event_string) == 1):
value = ord(event.event_string[0])
if value < 32:
event_string = chr(value + 0x40)
InputEvent.__init__(self, KEYBOARD_EVENT)
self.type = event.type
self.hw_code = event.hw_code
self.modifiers = event.modifiers
self.event_string = event_string
self.is_text = event.is_text
self.time = time.time()
class BrailleEvent(InputEvent):
def __init__(self, event):
"""Creates a new InputEvent of type BRAILLE_EVENT.
Arguments:
- event: the integer BrlTTY command for this event.
"""
InputEvent.__init__(self, BRAILLE_EVENT)
self.event = event
class MouseButtonEvent(InputEvent):
def __init__(self, event):
"""Creates a new InputEvent of type MOUSE_BUTTON_EVENT.
"""
InputEvent.__init__(self, MOUSE_BUTTON_EVENT)
self.x = event.detail1
self.y = event.detail2
self.pressed = event.type.endswith('p')
self.button = event.type[len("mouse:button:"):-1]
self.time = time.time()
class MouseMotionEvent(InputEvent):
def __init__(self, event):
"""[[[TODO: WDW - undefined at the moment.]]]
"""
InputEvent.__init__(self, MOUSE_MOTION_EVENT)
self.event = event
class SpeechEvent(InputEvent):
def __init__(self, event):
"""[[[TODO: WDW - undefined at the moment.]]]
"""
InputEvent.__init__(self, SPEECH_EVENT)
self.event = event
class InputEventHandler:
def __init__(self, function, description):
"""Creates a new InputEventHandler instance. All bindings
(e.g., key bindings and braille bindings) will be handled
by an instance of an InputEventHandler.
Arguments:
- function: the function to call with an InputEvent instance as its
sole argument. The function is expected to return True
if it consumes the event; otherwise it should return
False
- description: a localized string describing what this InputEvent
does
"""
self._function = function
self._description = description
def processInputEvent(self, script, inputEvent):
"""Processes an input event. If settings.learnModeEnabled is True,
this will merely report the description of the input event to braille
and speech. If settings.learnModeEnabled is False, this will call the
function bound to this InputEventHandler instance, passing the
inputEvent as the sole argument to the function.
This function is expected to return True if it consumes the
event; otherwise it is expected to return False.
Arguments:
- script: the script (if any) associated with this event
- inputEvent: the input event to pass to the function bound
to this InputEventHandler instance.
"""
consumed = False
if settings.learnModeEnabled:
if self._description:
# These imports are here to eliminate circular imports.
#
import braille
import speech
braille.displayMessage(self._description)
speech.speak(self._description)
consumed = True
else:
try:
consumed = self._function(script, inputEvent)
except:
debug.printException(debug.LEVEL_SEVERE)
return consumed
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