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# (C) Copyright 2005-2023 Enthought, Inc., Austin, TX
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in LICENSE.txt and may be redistributed only under
# the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
#
# Thanks for using Enthought open source!
from pyface.action.schema.api import SMenu, SMenuBar, SToolBar
from pyface.api import (
ConfirmationDialog,
FileDialog,
ImageResource,
YES,
OK,
CANCEL,
)
from pyface.tasks.api import (
Task,
TaskLayout,
PaneItem,
IEditor,
IEditorAreaPane,
EditorAreaPane,
)
from pyface.tasks.action.api import DockPaneToggleGroup, TaskAction
from traits.api import observe, Property, Instance
from example_panes import PythonScriptBrowserPane
from python_editor import PythonEditor
class ExampleTask(Task):
""" A simple task for editing Python code.
"""
# Task interface -------------------------------------------------------
id = "example.example_task"
name = "Multi-Tab Editor"
active_editor = Property(
Instance(IEditor), observe="editor_area.active_editor"
)
editor_area = Instance(IEditorAreaPane)
menu_bar = SMenuBar(
SMenu(
TaskAction(name="New", method="new", accelerator="Ctrl+N"),
TaskAction(name="Open...", method="open", accelerator="Ctrl+O"),
TaskAction(name="Save", method="save", accelerator="Ctrl+S"),
id="File",
name="&File",
),
SMenu(DockPaneToggleGroup(), id="View", name="&View"),
)
tool_bars = [
SToolBar(
TaskAction(
method="new",
tooltip="New file",
image=ImageResource("document_new"),
),
TaskAction(
method="open",
tooltip="Open a file",
image=ImageResource("document_open"),
),
TaskAction(
method="save",
tooltip="Save the current file",
image=ImageResource("document_save"),
),
image_size=(32, 32),
show_tool_names=False,
)
]
# ------------------------------------------------------------------------
# 'Task' interface.
# ------------------------------------------------------------------------
def _default_layout_default(self):
return TaskLayout(left=PaneItem("example.python_script_browser_pane"))
def activated(self):
""" Overriden to set the window's title.
"""
return
filename = self.active_editor.path if self.active_editor else ""
self.window.title = filename if filename else "Untitled"
def create_central_pane(self):
""" Create the central pane: the script editor.
"""
self.editor_area = EditorAreaPane()
return self.editor_area
def create_dock_panes(self):
""" Create the file browser and connect to its double click event.
"""
browser = PythonScriptBrowserPane()
handler = lambda _: self._open_file(browser.selected_file)
browser.observe(handler, "activated")
return [browser]
# ------------------------------------------------------------------------
# 'ExampleTask' interface.
# ------------------------------------------------------------------------
def new(self):
""" Opens a new empty window
"""
editor = PythonEditor()
self.editor_area.add_editor(editor)
self.editor_area.activate_editor(editor)
self.activated()
def open(self):
""" Shows a dialog to open a file.
"""
dialog = FileDialog(parent=self.window.control, wildcard="*.py")
if dialog.open() == OK:
self._open_file(dialog.path)
def save(self):
""" Attempts to save the current file, prompting for a path if
necessary. Returns whether the file was saved.
"""
editor = self.active_editor
try:
editor.save()
except IOError:
# If you are trying to save to a file that doesn't exist, open up a
# FileDialog with a 'save as' action.
dialog = FileDialog(
parent=self.window.control, action="save as", wildcard="*.py"
)
if dialog.open() == OK:
editor.save(dialog.path)
else:
return False
return True
# ------------------------------------------------------------------------
# Protected interface.
# ------------------------------------------------------------------------
def _open_file(self, filename):
""" Opens the file at the specified path in the editor.
"""
editor = PythonEditor(path=filename)
self.editor_area.add_editor(editor)
self.editor_area.activate_editor(editor)
self.activated()
def _prompt_for_save(self):
""" Prompts the user to save if necessary. Returns whether the dialog
was cancelled.
"""
dirty_editors = dict(
[
(editor.name, editor)
for editor in self.editor_area.editors
if editor.dirty
]
)
if not dirty_editors.keys():
return True
message = "You have unsaved files. Would you like to save them?"
dialog = ConfirmationDialog(
parent=self.window.control,
message=message,
cancel=True,
default=CANCEL,
title="Save Changes?",
)
result = dialog.open()
if result == CANCEL:
return False
elif result == YES:
for name, editor in dirty_editors.items():
editor.save(editor.path)
return True
# Trait change handlers ------------------------------------------------
@observe("window:closing")
def _prompt_on_close(self, event):
""" Prompt the user to save when exiting.
"""
close = self._prompt_for_save()
window = event.new
window.veto = not close
# Trait property getter/setters ----------------------------------------
def _get_active_editor(self):
if self.editor_area is not None:
return self.editor_area.active_editor
return None
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