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""" A text editor. """
# Standard library imports.
from os.path import basename
# Enthought library imports.
from enthought.pyface.workbench.api import TraitsUIEditor
from enthought.pyface.api import FileDialog, CANCEL
from enthought.traits.api import Code, Instance
from enthought.traits.ui.api import CodeEditor, Group, Item, View
from enthought.traits.ui.key_bindings import KeyBinding, KeyBindings
from enthought.traits.ui.menu import NoButtons
# Local imports.
from text_editor_handler import TextEditorHandler
def _id_generator():
""" A generator that returns the next number for untitled files. """
i = 1
while True:
yield(i)
i += 1
return
_id_generator = _id_generator()
class TextEditor(TraitsUIEditor):
""" A text editor. """
#### 'TextEditor' interface ###############################################
# The key bindings used by the editor.
key_bindings = Instance(KeyBindings)
# The text being edited.
text = Code
###########################################################################
# 'IEditor' interface.
###########################################################################
def save(self):
""" Saves the text to disk. """
# If the file has not yet been saved then prompt for the file name.
if len(self.obj.path) == 0:
self.save_as()
else:
f = file(self.obj.path, 'w')
f.write(self.text)
f.close()
# We have just saved the file so we ain't dirty no more!
self.dirty = False
return
def save_as(self):
""" Saves the text to disk after prompting for the file name. """
dialog = FileDialog(
parent = self.window.control,
action = 'save as',
default_filename = self.name,
wildcard = FileDialog.WILDCARD_PY
)
if dialog.open() != CANCEL:
# Update the editor.
self.id = dialog.path
self.name = basename(dialog.path)
# Update the resource.
self.obj.path = dialog.path
# Save it!
self.save()
return
###########################################################################
# 'TraitsUIEditor' interface.
###########################################################################
def create_ui(self, parent):
""" Creates the traits UI that represents the editor. """
ui = self.edit_traits(
parent=parent, view=self._create_traits_ui_view(), kind='subpanel'
)
return ui
###########################################################################
# 'TextEditor' interface.
###########################################################################
def run(self):
""" Runs the file as Python. """
# The file must be saved first!
self.save()
# Execute the code.
if len(self.obj.path) > 0:
view = self.window.get_view_by_id(
'enthought.plugins.python_shell_view'
)
if view is not None:
view.execute_command(
'execfile(r"%s")' % self.obj.path, hidden=False
)
return
def select_line(self, lineno):
""" Selects the specified line. """
self.ui.info.text.selected_line = lineno
return
###########################################################################
# Private interface.
###########################################################################
#### Trait initializers ###################################################
def _key_bindings_default(self):
""" Trait initializer. """
key_bindings = KeyBindings(
KeyBinding(
binding1 = 'Ctrl-s',
description = 'Save the file',
method_name = 'save'
),
KeyBinding(
binding1 = 'Ctrl-r',
description = 'Run the file',
method_name = 'run'
)
)
return key_bindings
#### Trait change handlers ################################################
def _obj_changed(self, new):
""" Static trait change handler. """
# The path will be the empty string if we are editing a file that has
# not yet been saved.
if len(new.path) == 0:
self.id = self._get_unique_id()
self.name = self.id
else:
self.id = new.path
self.name = basename(new.path)
f = file(new.path, 'r')
self.text = f.read()
f.close()
return
def _text_changed(self, trait_name, old, new):
""" Static trait change handler. """
if self.traits_inited():
self.dirty = True
return
def _dirty_changed(self, dirty):
""" Static trait change handler. """
if len(self.obj.path) > 0:
if dirty:
self.name = basename(self.obj.path) + '*'
else:
self.name = basename(self.obj.path)
return
#### Methods ##############################################################
def _create_traits_ui_view(self):
""" Create the traits UI view used by the editor.
fixme: We create the view dynamically to allow the key bindings to be
created dynamically (we don't use this just yet, but obviously plugins
need to be able to contribute new bindings).
"""
view = View(
Group(
Item(
'text', editor=CodeEditor(key_bindings=self.key_bindings)
),
show_labels = False
),
id = 'enthought.envisage.editor.text_editor',
handler = TextEditorHandler(),
kind = 'live',
resizable = True,
width = 1.0,
height = 1.0,
buttons = NoButtons,
)
return view
def _get_unique_id(self, prefix='Untitled '):
""" Return a unique id for a new file. """
id = prefix + str(_id_generator.next())
while self.window.get_editor_by_id(id) is not None:
id = prefix + str(_id_generator.next())
return id
#### EOF ######################################################################
|
