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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
#------------------------------------------------------------------------------
"""Creates a PyQt user interface for a specified UI object, where the UI is
"live", meaning that it immediately updates its underlying object(s).
"""
from pyface.qt import QtCore, QtGui
from traitsui.undo \
import UndoHistory
from traitsui.menu \
import UndoButton, RevertButton, OKButton, CancelButton, HelpButton
from ui_base \
import BaseDialog
from ui_panel \
import panel
#-------------------------------------------------------------------------------
# Create the different 'live update' PyQt user interfaces.
#-------------------------------------------------------------------------------
def ui_live(ui, parent):
"""Creates a live, non-modal PyQt user interface for a specified UI object.
"""
_ui_dialog(ui, parent, BaseDialog.NONMODAL)
def ui_livemodal(ui, parent):
"""Creates a live, modal PyQt user interface for a specified UI object.
"""
_ui_dialog(ui, parent, BaseDialog.MODAL)
def ui_popup(ui, parent):
"""Creates a live, modal popup PyQt user interface for a specified UI
object.
"""
_ui_dialog(ui, parent, BaseDialog.POPUP)
def _ui_dialog(ui, parent, style):
"""Creates a live PyQt user interface for a specified UI object.
"""
if ui.owner is None:
ui.owner = _LiveWindow()
BaseDialog.display_ui(ui, parent, style)
class _LiveWindow(BaseDialog):
"""User interface window that immediately updates its underlying object(s).
"""
def init(self, ui, parent, style):
"""Initialise the object.
FIXME: Note that we treat MODAL and POPUP as equivalent until we
have an example that demonstrates how POPUP is supposed to work.
"""
self.ui = ui
self.control = ui.control
view = ui.view
history = ui.history
if self.control is not None:
if history is not None:
history.on_trait_change(self._on_undoable, 'undoable',
remove=True)
history.on_trait_change(self._on_redoable, 'redoable',
remove=True)
history.on_trait_change(self._on_revertable, 'undoable',
remove=True)
ui.reset()
else:
self.create_dialog(parent, style)
self.set_icon(view.icon)
# Convert the buttons to actions.
buttons = [self.coerce_button(button) for button in view.buttons]
nr_buttons = len(buttons)
no_buttons = ((nr_buttons == 1) and self.is_button(buttons[0], ''))
has_buttons = ((not no_buttons) and ((nr_buttons > 0) or view.undo or
view.revert or view.ok or view.cancel))
if has_buttons or (view.menubar is not None):
if history is None:
history = UndoHistory()
else:
history = None
ui.history = history
if (not no_buttons) and (has_buttons or view.help):
bbox = QtGui.QDialogButtonBox()
# Create the necessary special function buttons.
if nr_buttons == 0:
if view.undo:
self.check_button(buttons, UndoButton)
if view.revert:
self.check_button(buttons, RevertButton)
if view.ok:
self.check_button(buttons, OKButton)
if view.cancel:
self.check_button(buttons, CancelButton)
if view.help:
self.check_button(buttons, HelpButton)
for raw_button, button in zip(view.buttons, buttons):
default = raw_button == view.default_button
if self.is_button(button, 'Undo'):
self.undo = self.add_button(button, bbox,
QtGui.QDialogButtonBox.ActionRole, self._on_undo,
False, default=default)
history.on_trait_change(self._on_undoable, 'undoable',
dispatch='ui')
if history.can_undo:
self._on_undoable(True)
self.redo = self.add_button(button, bbox,
QtGui.QDialogButtonBox.ActionRole, self._on_redo,
False, 'Redo')
history.on_trait_change(self._on_redoable, 'redoable',
dispatch='ui')
if history.can_redo:
self._on_redoable(True)
elif self.is_button(button, 'Revert'):
self.revert = self.add_button(button, bbox,
QtGui.QDialogButtonBox.ResetRole, self._on_revert,
False, default=default)
history.on_trait_change(self._on_revertable, 'undoable',
dispatch='ui')
if history.can_undo:
self._on_revertable(True)
elif self.is_button(button, 'OK'):
self.ok = self.add_button(button, bbox,
QtGui.QDialogButtonBox.AcceptRole,
self.control.accept, default=default)
ui.on_trait_change(self._on_error, 'errors', dispatch='ui')
elif self.is_button(button, 'Cancel'):
self.add_button(button, bbox,
QtGui.QDialogButtonBox.RejectRole,
self.control.reject, default=default)
elif self.is_button(button, 'Help'):
self.add_button(button, bbox,
QtGui.QDialogButtonBox.HelpRole, self._on_help,
default=default)
elif not self.is_button(button, ''):
self.add_button(button, bbox,
QtGui.QDialogButtonBox.ActionRole, default=default)
else:
bbox = None
self.add_contents(panel(ui), bbox)
def close(self, rc=True):
"""Close the dialog and set the given return code.
"""
super(_LiveWindow, self).close(rc)
self.undo = self.redo = self.revert = None
def _on_finished(self, result):
"""Handles the user finishing with the dialog.
"""
accept = bool(result)
if not accept and self.ui.history is not None:
self._on_revert()
self.close(accept)
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