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# (C) Copyright 2007 Riverbank Computing Limited
# (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!
import weakref
from pyface.qt import QtCore, QtGui
from traits.api import (
Enum,
Event,
Property,
Tuple,
Str,
VetoableEvent,
provides,
)
from pyface.i_window import IWindow, MWindow
from pyface.key_pressed_event import KeyPressedEvent
from .gui import GUI
from .widget import Widget
@provides(IWindow)
class Window(MWindow, Widget):
""" The toolkit specific implementation of a Window. See the IWindow
interface for the API documentation.
"""
# 'IWindow' interface -----------------------------------------------------
position = Property(Tuple)
size = Property(Tuple)
size_state = Enum("normal", "maximized")
title = Str()
# Window Events ----------------------------------------------------------
#: The window has been opened.
opened = Event()
#: The window is about to open.
opening = VetoableEvent()
#: The window has been activated.
activated = Event()
#: The window has been closed.
closed = Event()
#: The window is about to be closed.
closing = VetoableEvent()
#: The window has been deactivated.
deactivated = Event()
# Private interface ------------------------------------------------------
#: Shadow trait for position.
_position = Tuple((-1, -1))
#: Shadow trait for size.
_size = Tuple((-1, -1))
# -------------------------------------------------------------------------
# 'IWindow' interface.
# -------------------------------------------------------------------------
def activate(self):
self.control.activateWindow()
self.control.raise_()
# explicitly fire activated trait as signal doesn't create Qt event
self.activated = self
# -------------------------------------------------------------------------
# Protected 'IWindow' interface.
# -------------------------------------------------------------------------
def _create_control(self, parent):
""" Create a default QMainWindow. """
control = QtGui.QMainWindow(parent)
if self.size != (-1, -1):
control.resize(*self.size)
if self.position != (-1, -1):
control.move(*self.position)
if self.size_state != "normal":
self._size_state_changed(self.size_state)
control.setWindowTitle(self.title)
control.setEnabled(self.enabled)
# XXX starting with visible true is not recommended
control.setVisible(self.visible)
return control
# -------------------------------------------------------------------------
# 'IWidget' interface.
# -------------------------------------------------------------------------
def destroy(self):
if self.control is not None:
# Avoid problems with recursive calls.
# Widget.destroy() sets self.control to None,
# so we need a reference to control
control = self.control
# Widget.destroy() sets self.control to None and deletes it later,
# so we call it before control.close()
# This is not strictly necessary (closing the window in fact
# hides it), but the close may trigger an application shutdown,
# which can take a long time and may also attempt to recursively
# destroy the window again.
super().destroy()
control.close()
control.hide()
# -------------------------------------------------------------------------
# Private interface.
# -------------------------------------------------------------------------
def _get_position(self):
""" Property getter for position. """
return self._position
def _set_position(self, position):
""" Property setter for position. """
if self.control is not None:
self.control.move(*position)
old = self._position
self._position = position
self.trait_property_changed("position", old, position)
def _get_size(self):
""" Property getter for size. """
return self._size
def _set_size(self, size):
""" Property setter for size. """
if self.control is not None:
self.control.resize(*size)
old = self._size
self._size = size
self.trait_property_changed("size", old, size)
def _size_state_changed(self, state):
control = self.control
if control is None:
return # Nothing to do here
if state == "maximized":
control.setWindowState(
control.windowState() | QtCore.Qt.WindowState.WindowMaximized
)
elif state == "normal":
control.setWindowState(
control.windowState() & ~QtCore.Qt.WindowState.WindowMaximized
)
def _title_changed(self, title):
""" Static trait change handler. """
if self.control is not None:
self.control.setWindowTitle(title)
def __event_filter_default(self):
return WindowEventFilter(self)
class WindowEventFilter(QtCore.QObject):
""" An internal class that watches for certain events on behalf of the
Window instance.
"""
def __init__(self, window):
""" Initialise the event filter. """
QtCore.QObject.__init__(self)
# use a weakref to fix finalization issues with circular references
# we don't want to be the last thing holding a reference to the window
self._window = weakref.ref(window)
def eventFilter(self, obj, e):
""" Adds any event listeners required by the window. """
window = self._window()
# Sanity check.
if window is None or obj is not window.control:
return False
typ = e.type()
if typ == QtCore.QEvent.Type.Close:
# Do not destroy the window during its event handler.
GUI.invoke_later(window.close)
if window.control is not None:
e.ignore()
return True
if typ == QtCore.QEvent.Type.WindowActivate:
window.activated = window
elif typ == QtCore.QEvent.Type.WindowDeactivate:
window.deactivated = window
elif typ in {QtCore.QEvent.Type.Show, QtCore.QEvent.Type.Hide}:
window.visible = window.control.isVisible()
elif typ == QtCore.QEvent.Type.Resize:
# Get the new size and set the shadow trait without performing
# notification.
size = e.size()
window._size = (size.width(), size.height())
elif typ == QtCore.QEvent.Type.Move:
# Get the real position and set the trait without performing
# notification. Don't use event.pos(), as this excludes the window
# frame geometry.
pos = window.control.pos()
window._position = (pos.x(), pos.y())
elif typ == QtCore.QEvent.Type.KeyPress:
# Pyface doesn't seem to be Str aware. Only keep the key code
# if it corresponds to a single Latin1 character.
kstr = e.text()
try:
kcode = ord(str(kstr))
except:
kcode = 0
mods = e.modifiers()
window.key_pressed = KeyPressedEvent(
alt_down=(
(mods & QtCore.Qt.KeyboardModifier.AltModifier) == QtCore.Qt.KeyboardModifier.AltModifier
),
control_down=(
(mods & QtCore.Qt.KeyboardModifier.ControlModifier)
== QtCore.Qt.KeyboardModifier.ControlModifier
),
shift_down=(
(mods & QtCore.Qt.KeyboardModifier.ShiftModifier) == QtCore.Qt.KeyboardModifier.ShiftModifier
),
key_code=kcode,
event=e,
)
elif typ == QtCore.QEvent.Type.WindowStateChange:
# set the size_state of the window.
state = obj.windowState()
if state & QtCore.Qt.WindowState.WindowMaximized:
window.size_state = "maximized"
else:
window.size_state = "normal"
return False
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