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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.
"""
from pyface.qt import QtCore, QtGui
from traitsui.menu \
import ApplyButton, RevertButton, OKButton, CancelButton, HelpButton
from ui_base \
import BaseDialog
from ui_panel \
import panel
#-------------------------------------------------------------------------------
# Create the different modal PyQt user interfaces.
#-------------------------------------------------------------------------------
def ui_modal(ui, parent):
"""Creates a modal PyQt user interface for a specified UI object.
"""
_ui_dialog(ui, parent, BaseDialog.MODAL)
def ui_nonmodal(ui, parent):
"""Creates a non-modal PyQt user interface for a specified UI object.
"""
_ui_dialog(ui, parent, BaseDialog.NONMODAL)
def _ui_dialog(ui, parent, style):
"""Creates a PyQt dialog box for a specified UI object.
Changes are not immediately applied to the underlying object. The user
must click **Apply** or **OK** to apply changes. The user can revert
changes by clicking **Revert** or **Cancel**.
"""
if ui.owner is None:
ui.owner = _ModalDialog()
BaseDialog.display_ui(ui, parent, style)
class _ModalDialog(BaseDialog):
"""Modal dialog box for Traits-based user interfaces.
"""
def init(self, ui, parent, style):
"""Initialise the object.
"""
self.ui = ui
self.control = ui.control
view = ui.view
revert = apply = False
if self.control is not None:
if hasattr(self, 'revert'):
revert = self.revert.isEnabled()
if hasattr(self, 'apply'):
apply = self.apply.isEnabled()
ui.reset()
else:
self.create_dialog(parent, style)
# Create the 'context' copies we will need while editing:
context = ui.context
ui._context = context
ui.context = self._copy_context(context)
ui._revert = self._copy_context(context)
self.set_icon(view.icon)
# Convert the buttons to actions.
buttons = [self.coerce_button(button) for button in view.buttons]
nr_buttons = len(buttons)
if (nr_buttons != 1) or (not self.is_button(buttons[0], '')):
bbox = QtGui.QDialogButtonBox()
# Create the necessary special function buttons.
if nr_buttons == 0:
if view.apply:
self.check_button(buttons, ApplyButton)
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, 'Apply'):
self.apply = self.add_button(button, bbox,
QtGui.QDialogButtonBox.ApplyRole, self._on_apply,
enabled=apply, default=default)
ui.on_trait_change(self._on_applyable, 'modified',
dispatch='ui')
elif self.is_button(button, 'Revert'):
self.revert = self.add_button(button, bbox,
QtGui.QDialogButtonBox.ResetRole, self._on_revert,
enabled=revert, default=default)
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):
"""Close the dialog and set the given return code.
"""
super(_ModalDialog, self).close(rc)
self.apply = self.revert = self.help = None
def _copy_context(self, context):
"""Creates a copy of a *context* dictionary.
"""
result = {}
for name, value in context.items():
if value is not None:
result[name] = value.clone_traits()
else:
result[name] = None
return result
def _apply_context(self, from_context, to_context):
"""Applies the traits in the *from_context* to the *to_context*.
"""
for name, value in from_context.items():
if value is not None:
to_context[name].copy_traits(value)
else:
to_context[name] = None
if to_context is self.ui._context:
on_apply = self.ui.view.on_apply
if on_apply is not None:
on_apply()
def _on_finished(self, result):
"""Handles the user finishing with the dialog.
"""
accept = bool(result)
if accept:
self._apply_context(self.ui.context, self.ui._context)
else:
self._apply_context(self.ui._revert, self.ui._context)
self.close(accept)
def _on_apply(self):
"""Handles a request to apply changes.
"""
ui = self.ui
self._apply_context(ui.context, ui._context)
self.revert.setEnabled(True)
ui.handler.apply(ui.info)
ui.modified = False
def _on_applyable(self, state):
"""Handles a change to the "modified" state of the user interface .
"""
self.apply.setEnabled( state )
def _on_revert(self):
"""Handles a request to revert changes.
"""
ui = self.ui
self._apply_context(ui._revert, ui.context)
self._apply_context(ui._revert, ui._context)
self.revert.setEnabled(False)
ui.handler.revert(ui.info)
ui.modified = False
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