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#------------------------------------------------------------------------------
# Copyright (c) 2007, Riverbank Computing Limited
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD license.
# However, when used with the GPL version of PyQt the additional terms described in the PyQt GPL exception also apply
#
# Author: Riverbank Computing Limited
# Description: <Enthought pyface package component>
#------------------------------------------------------------------------------
# Standard library imports.
import sys
# Major package imports.
from pyface.qt import QtCore, QtGui
# Enthought library imports.
from traits.api import Bool, Event, provides, Unicode
# Local imports.
from pyface.i_python_editor import IPythonEditor, MPythonEditor
from pyface.key_pressed_event import KeyPressedEvent
from pyface.widget import Widget
from pyface.ui.qt4.code_editor.code_widget import AdvancedCodeWidget
@provides(IPythonEditor)
class PythonEditor(MPythonEditor, Widget):
""" The toolkit specific implementation of a PythonEditor. See the
IPythonEditor interface for the API documentation.
"""
#### 'IPythonEditor' interface ############################################
dirty = Bool(False)
path = Unicode
show_line_numbers = Bool(True)
#### Events ####
changed = Event
key_pressed = Event(KeyPressedEvent)
###########################################################################
# 'object' interface.
###########################################################################
def __init__(self, parent, **traits):
super(PythonEditor, self).__init__(parent=parent, **traits)
self._create()
###########################################################################
# 'PythonEditor' interface.
###########################################################################
def load(self, path=None):
""" Loads the contents of the editor.
"""
if path is None:
path = self.path
# We will have no path for a new script.
if len(path) > 0:
f = open(self.path, 'r')
text = f.read()
f.close()
else:
text = ''
self.control.code.setPlainText(text)
self.dirty = False
def save(self, path=None):
""" Saves the contents of the editor.
"""
if path is None:
path = self.path
f = open(path, 'w')
f.write(self.control.code.toPlainText())
f.close()
self.dirty = False
def select_line(self, lineno):
""" Selects the specified line.
"""
self.control.code.set_line_column(lineno, 0)
self.control.code.moveCursor(QtGui.QTextCursor.EndOfLine,
QtGui.QTextCursor.KeepAnchor)
###########################################################################
# 'Widget' interface.
###########################################################################
def _add_event_listeners(self):
super(PythonEditor, self)._add_event_listeners()
self.control.code.installEventFilter(self._event_filter)
# Connect signals for text changes.
self.control.code.modificationChanged.connect(self._on_dirty_changed)
self.control.code.textChanged.connect(self._on_text_changed)
def _remove_event_listeners(self):
if self.control is not None:
# Disconnect signals for text changes.
self.control.code.modificationChanged.disconnect(
self._on_dirty_changed)
self.control.code.textChanged.disconnect(self._on_text_changed)
if self._event_filter is not None:
self.control.code.removeEventFilter(self._event_filter)
super(PythonEditor, self)._remove_event_listeners()
def __event_filter_default(self):
return PythonEditorEventFilter(self, self.control)
###########################################################################
# Trait handlers.
###########################################################################
def _path_changed(self):
self._changed_path()
def _show_line_numbers_changed(self):
if self.control is not None:
self.control.code.line_number_widget.setVisible(
self.show_line_numbers)
self.control.code.update_line_number_width()
###########################################################################
# Private interface.
###########################################################################
def _create_control(self, parent):
""" Creates the toolkit-specific control for the widget.
"""
self.control = control = AdvancedCodeWidget(parent)
self._show_line_numbers_changed()
# Load the editor's contents.
self.load()
return control
def _on_dirty_changed(self, dirty):
""" Called whenever a change is made to the dirty state of the
document.
"""
self.dirty = dirty
def _on_text_changed(self):
""" Called whenever a change is made to the text of the document.
"""
self.changed = True
class PythonEditorEventFilter(QtCore.QObject):
""" A thin wrapper around the advanced code widget to handle the key_pressed
Event.
"""
def __init__(self, editor, parent):
super(PythonEditorEventFilter, self).__init__(parent)
self.__editor = editor
def eventFilter(self, obj, event):
""" Reimplemented to trap key presses.
"""
if self.__editor.control and obj == self.__editor.control and \
event.type() == QtCore.QEvent.FocusOut:
# Hack for Traits UI compatibility.
self.__editor.control.lostFocus.emit()
elif self.__editor.control and obj == self.__editor.control.code and \
event.type() == QtCore.QEvent.KeyPress:
# Pyface doesn't seem to be Unicode aware. Only keep the key code
# if it corresponds to a single Latin1 character.
kstr = event.text()
try:
kcode = ord(str(kstr))
except:
kcode = 0
mods = event.modifiers()
self.key_pressed = KeyPressedEvent(
alt_down = ((mods & QtCore.Qt.AltModifier) ==
QtCore.Qt.AltModifier),
control_down = ((mods & QtCore.Qt.ControlModifier) ==
QtCore.Qt.ControlModifier),
shift_down = ((mods & QtCore.Qt.ShiftModifier) ==
QtCore.Qt.ShiftModifier),
key_code = kcode,
event = event)
return super(PythonEditorEventFilter, self).eventFilter(obj, event)
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