"""
Custom Qt widgets that serve as native objects that the public-facing elements
wrap.
"""
import contextlib
import inspect
import os
import sys
import time
import warnings
from typing import (
TYPE_CHECKING,
Any,
ClassVar,
Dict,
List,
Optional,
Sequence,
Tuple,
Union,
cast,
)
from weakref import WeakValueDictionary
from qtpy.QtCore import QEvent, QEventLoop, QPoint, QProcess, QSize, Qt, Slot
from qtpy.QtGui import QIcon
from qtpy.QtWidgets import (
QApplication,
QDialog,
QDockWidget,
QHBoxLayout,
QMainWindow,
QShortcut,
QToolTip,
QWidget,
)
from superqt.utils import QSignalThrottler
from ..plugins import menu_item_template as plugin_menu_item_template
from ..plugins import plugin_manager
from ..settings import get_settings
from ..utils import perf
from ..utils._proxies import PublicOnlyProxy
from ..utils.io import imsave
from ..utils.misc import in_ipython, in_jupyter, running_as_bundled_app
from ..utils.notifications import Notification
from ..utils.theme import _themes, get_system_theme
from ..utils.translations import trans
from . import menus
from .dialogs.confirm_close_dialog import ConfirmCloseDialog
from .dialogs.qt_activity_dialog import QtActivityDialog
from .dialogs.qt_notification import NapariQtNotification
from .qt_event_loop import NAPARI_ICON_PATH, get_app, quit_app
from .qt_resources import get_stylesheet
from .qt_viewer import QtViewer
from .utils import QImg2array, qbytearray_to_str, str_to_qbytearray
from .widgets.qt_viewer_dock_widget import (
_SHORTCUT_DEPRECATION_STRING,
QtViewerDockWidget,
)
from .widgets.qt_viewer_status_bar import ViewerStatusBar
_sentinel = object()
if TYPE_CHECKING:
from magicgui.widgets import Widget
from qtpy.QtGui import QImage
from ..viewer import Viewer
class _QtMainWindow(QMainWindow):
# This was added so that someone can patch
# `napari._qt.qt_main_window._QtMainWindow._window_icon`
# to their desired window icon
_window_icon = NAPARI_ICON_PATH
# To track window instances and facilitate getting the "active" viewer...
# We use this instead of QApplication.activeWindow for compatibility with
# IPython usage. When you activate IPython, it will appear that there are
# *no* active windows, so we want to track the most recently active windows
_instances: ClassVar[List['_QtMainWindow']] = []
def __init__(self, viewer: 'Viewer', parent=None) -> None:
super().__init__(parent)
self._ev = None
self._qt_viewer = QtViewer(viewer, show_welcome_screen=True)
self._quit_app = False
self.setWindowIcon(QIcon(self._window_icon))
self.setAttribute(Qt.WidgetAttribute.WA_DeleteOnClose)
self.setUnifiedTitleAndToolBarOnMac(True)
center = QWidget(self)
center.setLayout(QHBoxLayout())
center.layout().addWidget(self._qt_viewer)
center.layout().setContentsMargins(4, 0, 4, 0)
self.setCentralWidget(center)
self.setWindowTitle(self._qt_viewer.viewer.title)
self._maximized_flag = False
self._window_size = None
self._window_pos = None
self._old_size = None
self._positions = []
act_dlg = QtActivityDialog(self._qt_viewer._canvas_overlay)
self._qt_viewer._canvas_overlay.resized.connect(
act_dlg.move_to_bottom_right
)
act_dlg.hide()
self._activity_dialog = act_dlg
self.setStatusBar(ViewerStatusBar(self))
settings = get_settings()
# TODO:
# settings.plugins.defaults.call_order = plugin_manager.call_order()
# set the values in plugins to match the ones saved in settings
if settings.plugins.call_order is not None:
plugin_manager.set_call_order(settings.plugins.call_order)
_QtMainWindow._instances.append(self)
# since we initialize canvas before window,
# we need to manually connect them again.
handle = self.windowHandle()
if handle is not None:
handle.screenChanged.connect(
self._qt_viewer.canvas._backend.screen_changed
)
self.status_throttler = QSignalThrottler(parent=self)
self.status_throttler.setTimeout(50)
# In the GUI we expect lots of changes to the cursor position, so
# replace the direct connection with a throttled one.
with contextlib.suppress(IndexError):
viewer.cursor.events.position.disconnect(
viewer._update_status_bar_from_cursor
)
viewer.cursor.events.position.connect(self.status_throttler.throttle)
self.status_throttler.triggered.connect(
viewer._update_status_bar_from_cursor
)
def statusBar(self) -> 'ViewerStatusBar':
return super().statusBar()
@classmethod
def current(cls) -> Optional['_QtMainWindow']:
return cls._instances[-1] if cls._instances else None
@classmethod
def current_viewer(cls):
window = cls.current()
return window._qt_viewer.viewer if window else None
def event(self, e: QEvent) -> bool:
if (
e.type() == QEvent.Type.ToolTip
and self._qt_viewer.viewer.tooltip.visible
):
# globalPos is for Qt5 e.globalPosition().toPoint() is for QT6
# https://doc-snapshots.qt.io/qt6-dev/qmouseevent-obsolete.html#globalPos
pnt = (
e.globalPosition().toPoint()
if hasattr(e, "globalPosition")
else e.globalPos()
)
QToolTip.showText(pnt, self._qt_viewer.viewer.tooltip.text, self)
if e.type() == QEvent.Type.Close:
# when we close the MainWindow, remove it from the instances list
with contextlib.suppress(ValueError):
_QtMainWindow._instances.remove(self)
if e.type() in {QEvent.Type.WindowActivate, QEvent.Type.ZOrderChange}:
# upon activation or raise_, put window at the end of _instances
with contextlib.suppress(ValueError):
inst = _QtMainWindow._instances
inst.append(inst.pop(inst.index(self)))
return super().event(e)
def _load_window_settings(self):
"""
Load window layout settings from configuration.
"""
settings = get_settings()
window_position = settings.application.window_position
# It's necessary to verify if the window/position value is valid with
# the current screen.
if not window_position:
window_position = (self.x(), self.y())
else:
width, height = window_position
screen_geo = QApplication.primaryScreen().geometry()
if screen_geo.width() < width or screen_geo.height() < height:
window_position = (self.x(), self.y())
return (
settings.application.window_state,
settings.application.window_size,
window_position,
settings.application.window_maximized,
settings.application.window_fullscreen,
)
def _get_window_settings(self):
"""Return current window settings.
Symmetric to the 'set_window_settings' setter.
"""
window_fullscreen = self.isFullScreen()
if window_fullscreen:
window_maximized = self._maximized_flag
else:
window_maximized = self.isMaximized()
window_state = qbytearray_to_str(self.saveState())
return (
window_state,
self._window_size or (self.width(), self.height()),
self._window_pos or (self.x(), self.y()),
window_maximized,
window_fullscreen,
)
def _set_window_settings(
self,
window_state,
window_size,
window_position,
window_maximized,
window_fullscreen,
):
"""
Set window settings.
Symmetric to the 'get_window_settings' accessor.
"""
self.setUpdatesEnabled(False)
self.setWindowState(Qt.WindowState.WindowNoState)
if window_position:
window_position = QPoint(*window_position)
self.move(window_position)
if window_size:
window_size = QSize(*window_size)
self.resize(window_size)
if window_state:
self.restoreState(str_to_qbytearray(window_state))
# Toggling the console visibility is disabled when it is not
# available, so ensure that it is hidden.
if in_ipython():
self._qt_viewer.dockConsole.setVisible(False)
if window_fullscreen:
self.setWindowState(Qt.WindowState.WindowFullScreen)
self._maximized_flag = window_maximized
elif window_maximized:
self.setWindowState(Qt.WindowState.WindowMaximized)
self.setUpdatesEnabled(True)
def _save_current_window_settings(self):
"""Save the current geometry of the main window."""
(
window_state,
window_size,
window_position,
window_maximized,
window_fullscreen,
) = self._get_window_settings()
settings = get_settings()
if settings.application.save_window_geometry:
settings.application.window_maximized = window_maximized
settings.application.window_fullscreen = window_fullscreen
settings.application.window_position = window_position
settings.application.window_size = window_size
settings.application.window_statusbar = (
not self.statusBar().isHidden()
)
if settings.application.save_window_state:
settings.application.window_state = window_state
def close(self, quit_app=False, confirm_need=False):
"""Override to handle closing app or just the window."""
if hasattr(self.status_throttler, "_timer"):
self.status_throttler._timer.stop()
if not quit_app and not self._qt_viewer.viewer.layers:
return super().close()
if (
not confirm_need
or not get_settings().application.confirm_close_window
or ConfirmCloseDialog(self, quit_app).exec_() == QDialog.Accepted
):
self._quit_app = quit_app
return super().close()
def close_window(self):
"""Close active dialog or active window."""
parent = QApplication.focusWidget()
while parent is not None:
if isinstance(parent, QMainWindow):
self.close()
break
if isinstance(parent, QDialog):
parent.close()
break
try:
parent = parent.parent()
except AttributeError:
parent = getattr(parent, "_parent", None)
def show(self, block=False):
super().show()
self._qt_viewer.setFocus()
if block:
self._ev = QEventLoop()
self._ev.exec()
def changeEvent(self, event):
"""Handle window state changes."""
if event.type() == QEvent.Type.WindowStateChange:
# TODO: handle maximization issue. When double clicking on the
# title bar on Mac the resizeEvent is called an varying amount
# of times which makes it hard to track the original size before
# maximization.
condition = (
self.isMaximized() if os.name == "nt" else self.isFullScreen()
)
if condition and self._old_size is not None:
if self._positions and len(self._positions) > 1:
self._window_pos = self._positions[-2]
self._window_size = (
self._old_size.width(),
self._old_size.height(),
)
else:
self._old_size = None
self._window_pos = None
self._window_size = None
self._positions = []
super().changeEvent(event)
def resizeEvent(self, event):
"""Override to handle original size before maximizing."""
# the first resize event will have nonsense positions that we dont
# want to store (and potentially restore)
if event.oldSize().isValid():
self._old_size = event.oldSize()
self._positions.append((self.x(), self.y()))
if self._positions and len(self._positions) >= 2:
self._window_pos = self._positions[-2]
self._positions = self._positions[-2:]
super().resizeEvent(event)
def closeEvent(self, event):
"""This method will be called when the main window is closing.
Regardless of whether cmd Q, cmd W, or the close button is used...
"""
if (
event.spontaneous()
and get_settings().application.confirm_close_window
and self._qt_viewer.viewer.layers
and ConfirmCloseDialog(self, False).exec_() != QDialog.Accepted
):
event.ignore()
return
if self._ev and self._ev.isRunning():
self._ev.quit()
# Close any floating dockwidgets
for dock in self.findChildren(QtViewerDockWidget):
if isinstance(dock, QWidget) and dock.isFloating():
dock.setFloating(False)
self._save_current_window_settings()
# On some versions of Darwin, exiting while fullscreen seems to tickle
# some bug deep in NSWindow. This forces the fullscreen keybinding
# test to complete its draw cycle, then pop back out of fullscreen.
if self.isFullScreen():
self.showNormal()
for _ in range(5):
time.sleep(0.1)
QApplication.processEvents()
if self._quit_app:
quit_app()
event.accept()
def restart(self):
"""Restart the napari application in a detached process."""
process = QProcess()
process.setProgram(sys.executable)
if not running_as_bundled_app():
process.setArguments(sys.argv)
process.startDetached()
self.close(quit_app=True)
@staticmethod
@Slot(Notification)
def show_notification(notification: Notification):
"""Show notification coming from a thread."""
NapariQtNotification.show_notification(notification)
[docs]class Window:
"""Application window that contains the menu bar and viewer.
Parameters
----------
viewer : napari.components.ViewerModel
Contained viewer widget.
Attributes
----------
file_menu : qtpy.QtWidgets.QMenu
File menu.
help_menu : qtpy.QtWidgets.QMenu
Help menu.
main_menu : qtpy.QtWidgets.QMainWindow.menuBar
Main menubar.
view_menu : qtpy.QtWidgets.QMenu
View menu.
window_menu : qtpy.QtWidgets.QMenu
Window menu.
"""
def __init__(self, viewer: 'Viewer', *, show: bool = True):
# create QApplication if it doesn't already exist
get_app()
# Dictionary holding dock widgets
self._dock_widgets: Dict[
str, QtViewerDockWidget
] = WeakValueDictionary()
self._unnamed_dockwidget_count = 1
# Connect the Viewer and create the Main Window
self._qt_window = _QtMainWindow(viewer)
# connect theme events before collecting plugin-provided themes
# to ensure icons from the plugins are generated correctly.
_themes.events.added.connect(self._add_theme)
_themes.events.removed.connect(self._remove_theme)
# discover any themes provided by plugins
plugin_manager.discover_themes()
self._setup_existing_themes()
self._add_menus()
self._update_theme()
get_settings().appearance.events.theme.connect(self._update_theme)
self._add_viewer_dock_widget(
self._qt_viewer.dockConsole, tabify=False, menu=self.window_menu
)
self._add_viewer_dock_widget(
self._qt_viewer.dockLayerControls,
tabify=False,
menu=self.window_menu,
)
self._add_viewer_dock_widget(
self._qt_viewer.dockLayerList, tabify=False, menu=self.window_menu
)
if perf.USE_PERFMON:
self._add_viewer_dock_widget(
self._qt_viewer.dockPerformance, menu=self.window_menu
)
viewer.events.help.connect(self._help_changed)
viewer.events.title.connect(self._title_changed)
viewer.events.theme.connect(self._update_theme)
viewer.layers.events.connect(self.file_menu.update)
viewer.events.status.connect(self._status_changed)
if show:
self.show()
# Ensure the controls dock uses the minimum height
self._qt_window.resizeDocks(
[
self._qt_viewer.dockLayerControls,
self._qt_viewer.dockLayerList,
],
[self._qt_viewer.dockLayerControls.minimumHeight(), 10000],
Qt.Orientation.Vertical,
)
def _setup_existing_themes(self, connect: bool = True):
"""This function is only executed once at the startup of napari
to connect events to themes that have not been connected yet.
Parameters
----------
connect : bool
Determines whether the `connect` or `disconnect` method should be used.
"""
for theme in _themes.values():
if connect:
self._connect_theme(theme)
else:
self._disconnect_theme(theme)
def _connect_theme(self, theme):
# connect events to update theme. Here, we don't want to pass the event
# since it won't have the right `value` attribute.
theme.events.background.connect(self._update_theme_no_event)
theme.events.foreground.connect(self._update_theme_no_event)
theme.events.primary.connect(self._update_theme_no_event)
theme.events.secondary.connect(self._update_theme_no_event)
theme.events.highlight.connect(self._update_theme_no_event)
theme.events.text.connect(self._update_theme_no_event)
theme.events.warning.connect(self._update_theme_no_event)
theme.events.current.connect(self._update_theme_no_event)
theme.events.icon.connect(self._update_theme_no_event)
theme.events.canvas.connect(
lambda _: self._qt_viewer.canvas._set_theme_change(
get_settings().appearance.theme
)
)
# connect console-specific attributes only if QtConsole
# is present. The `console` is called which might slow
# things down a little.
if self._qt_viewer._console:
theme.events.console.connect(self._qt_viewer.console._update_theme)
theme.events.syntax_style.connect(
self._qt_viewer.console._update_theme
)
def _disconnect_theme(self, theme):
theme.events.background.disconnect(self._update_theme_no_event)
theme.events.foreground.disconnect(self._update_theme_no_event)
theme.events.primary.disconnect(self._update_theme_no_event)
theme.events.secondary.disconnect(self._update_theme_no_event)
theme.events.highlight.disconnect(self._update_theme_no_event)
theme.events.text.disconnect(self._update_theme_no_event)
theme.events.warning.disconnect(self._update_theme_no_event)
theme.events.current.disconnect(self._update_theme_no_event)
theme.events.icon.disconnect(self._update_theme_no_event)
theme.events.canvas.disconnect(
lambda _: self._qt_viewer.canvas._set_theme_change(
get_settings().appearance.theme
)
)
# disconnect console-specific attributes only if QtConsole
# is present and they were previously connected
if self._qt_viewer._console:
theme.events.console.disconnect(
self._qt_viewer.console._update_theme
)
theme.events.syntax_style.disconnect(
self._qt_viewer.console._update_theme
)
def _add_theme(self, event):
"""Add new theme and connect events."""
theme = event.value
self._connect_theme(theme)
def _remove_theme(self, event):
"""Remove theme and disconnect events."""
theme = event.value
self._disconnect_theme(theme)
@property
def qt_viewer(self):
warnings.warn(
trans._(
'Public access to Window.qt_viewer is deprecated and will be removed in\nv0.5.0. It is considered an "implementation detail" of the napari\napplication, not part of the napari viewer model. If your use case\nrequires access to qt_viewer, please open an issue to discuss.',
deferred=True,
),
category=FutureWarning,
stacklevel=2,
)
return self._qt_window._qt_viewer
@property
def _qt_viewer(self):
# this is starting to be "vestigial"... this property could be removed
return self._qt_window._qt_viewer
@property
def _status_bar(self):
# TODO: remove from window
return self._qt_window.statusBar()
def _add_menus(self):
"""Add menubar to napari app."""
# TODO: move this to _QMainWindow... but then all of the Menu()
# items will not have easy access to the methods on this Window obj.
self.main_menu = self._qt_window.menuBar()
# Menubar shortcuts are only active when the menubar is visible.
# Therefore, we set a global shortcut not associated with the menubar
# to toggle visibility, *but*, in order to not shadow the menubar
# shortcut, we disable it, and only enable it when the menubar is
# hidden. See this stackoverflow link for details:
# https://stackoverflow.com/questions/50537642/how-to-keep-the-shortcuts-of-a-hidden-widget-in-pyqt5
self._main_menu_shortcut = QShortcut('Ctrl+M', self._qt_window)
self._main_menu_shortcut.setEnabled(False)
self._main_menu_shortcut.activated.connect(
self._toggle_menubar_visible
)
self.file_menu = menus.FileMenu(self)
self.main_menu.addMenu(self.file_menu)
self.view_menu = menus.ViewMenu(self)
self.main_menu.addMenu(self.view_menu)
self.window_menu = menus.WindowMenu(self)
self.main_menu.addMenu(self.window_menu)
self.plugins_menu = menus.PluginsMenu(self)
self.main_menu.addMenu(self.plugins_menu)
self.help_menu = menus.HelpMenu(self)
self.main_menu.addMenu(self.help_menu)
if perf.USE_PERFMON:
self._debug_menu = menus.DebugMenu(self)
self.main_menu.addMenu(self._debug_menu)
def _toggle_menubar_visible(self):
"""Toggle visibility of app menubar.
This function also disables or enables a global keyboard shortcut to
show the menubar, since menubar shortcuts are only available while the
menubar is visible.
"""
self.main_menu.setVisible(not self.main_menu.isVisible())
self._main_menu_shortcut.setEnabled(not self.main_menu.isVisible())
def _toggle_fullscreen(self):
"""Toggle fullscreen mode."""
if self._qt_window.isFullScreen():
self._qt_window.showNormal()
else:
self._qt_window.showFullScreen()
def _toggle_play(self):
"""Toggle play."""
if self._qt_viewer.dims.is_playing:
self._qt_viewer.dims.stop()
else:
axis = self._qt_viewer.viewer.dims.last_used or 0
self._qt_viewer.dims.play(axis)
def _add_plugin_function_widget(self, plugin_name: str, widget_name: str):
"""Add plugin function widget if not already added.
Parameters
----------
plugin_name : str
Name of a plugin providing a widget
widget_name : str, optional
Name of a widget provided by `plugin_name`. If `None`, and the
specified plugin provides only a single widget, that widget will be
returned, otherwise a ValueError will be raised, by default None
"""
full_name = plugin_menu_item_template.format(plugin_name, widget_name)
if full_name in self._dock_widgets:
return
func = plugin_manager._function_widgets[plugin_name][widget_name]
# Add function widget
return self.add_function_widget(
func, name=full_name, area=None, allowed_areas=None
)
def _add_viewer_dock_widget(
self, dock_widget: QtViewerDockWidget, tabify=False, menu=None
):
"""Add a QtViewerDockWidget to the main window
If other widgets already present in area then will tabify.
Parameters
----------
dock_widget : QtViewerDockWidget
`dock_widget` will be added to the main window.
tabify : bool
Flag to tabify dockwidget or not.
"""
# Find if any othe dock widgets are currently in area
current_dws_in_area = [
dw
for dw in self._qt_window.findChildren(QDockWidget)
if self._qt_window.dockWidgetArea(dw) == dock_widget.qt_area
]
self._qt_window.addDockWidget(dock_widget.qt_area, dock_widget)
# If another dock widget present in area then tabify
if current_dws_in_area:
if tabify:
self._qt_window.tabifyDockWidget(
current_dws_in_area[-1], dock_widget
)
dock_widget.show()
dock_widget.raise_()
elif dock_widget.area in ('right', 'left'):
_wdg = current_dws_in_area + [dock_widget]
# add sizes to push lower widgets up
sizes = list(range(1, len(_wdg) * 4, 4))
self._qt_window.resizeDocks(
_wdg, sizes, Qt.Orientation.Vertical
)
if menu:
action = dock_widget.toggleViewAction()
action.setStatusTip(dock_widget.name)
action.setText(dock_widget.name)
import warnings
with warnings.catch_warnings():
warnings.simplefilter("ignore", FutureWarning)
# deprecating with 0.4.8, but let's try to keep compatibility.
shortcut = dock_widget.shortcut
if shortcut is not None:
action.setShortcut(shortcut)
menu.addAction(action)
# self.window_menu.addAction(action)
# see #3663, to fix #3624 more generally
dock_widget.setFloating(False)
def _remove_dock_widget(self, event=None):
names = list(self._dock_widgets.keys())
for widget_name in names:
if event.value in widget_name:
# remove this widget
widget = self._dock_widgets[widget_name]
self.remove_dock_widget(widget)
[docs] def resize(self, width, height):
"""Resize the window.
Parameters
----------
width : int
Width in logical pixels.
height : int
Height in logical pixels.
"""
self._qt_window.resize(width, height)
[docs] def set_geometry(self, left, top, width, height):
"""Set the geometry of the widget
Parameters
----------
left : int
X coordinate of the upper left border.
top : int
Y coordinate of the upper left border.
width : int
Width of the rectangle shape of the window.
height : int
Height of the rectangle shape of the window.
"""
self._qt_window.setGeometry(left, top, width, height)
[docs] def geometry(self) -> Tuple[int, int, int, int]:
"""Get the geometry of the widget
Returns
-------
left : int
X coordinate of the upper left border.
top : int
Y coordinate of the upper left border.
width : int
Width of the rectangle shape of the window.
height : int
Height of the rectangle shape of the window.
"""
rect = self._qt_window.geometry()
return rect.left(), rect.top(), rect.width(), rect.height()
[docs] def show(self, *, block=False):
"""Resize, show, and bring forward the window.
Raises
------
RuntimeError
If the viewer.window has already been closed and deleted.
"""
settings = get_settings()
try:
self._qt_window.show(block=block)
except (AttributeError, RuntimeError):
raise RuntimeError(
trans._(
"This viewer has already been closed and deleted. Please create a new one.",
deferred=True,
)
)
if settings.application.first_time:
settings.application.first_time = False
try:
self._qt_window.resize(self._qt_window.layout().sizeHint())
except (AttributeError, RuntimeError):
raise RuntimeError(
trans._(
"This viewer has already been closed and deleted. Please create a new one.",
deferred=True,
)
)
else:
try:
if settings.application.save_window_geometry:
self._qt_window._set_window_settings(
*self._qt_window._load_window_settings()
)
except Exception as err:
import warnings
warnings.warn(
trans._(
"The window geometry settings could not be loaded due to the following error: {err}",
deferred=True,
err=err,
),
category=RuntimeWarning,
stacklevel=2,
)
# Resize axis labels now that window is shown
self._qt_viewer.dims._resize_axis_labels()
# We want to bring the viewer to the front when
# A) it is our own event loop OR we are running in jupyter
# B) it is not the first time a QMainWindow is being created
# `app_name` will be "napari" iff the application was instantiated in
# get_app(). isActiveWindow() will be True if it is the second time a
# _qt_window has been created.
# See #721, #732, #735, #795, #1594
app_name = QApplication.instance().applicationName()
if (
app_name == 'napari' or in_jupyter()
) and self._qt_window.isActiveWindow():
self.activate()
[docs] def activate(self):
"""Make the viewer the currently active window."""
self._qt_window.raise_() # for macOS
self._qt_window.activateWindow() # for Windows
def _update_theme_no_event(self):
self._update_theme()
def _update_theme(self, event=None):
"""Update widget color theme."""
settings = get_settings()
with contextlib.suppress(AttributeError, RuntimeError):
if event:
value = event.value
self._qt_viewer.viewer.theme = value
settings.appearance.theme = value
else:
value = (
get_system_theme()
if settings.appearance.theme == "system"
else self._qt_viewer.viewer.theme
)
self._qt_window.setStyleSheet(get_stylesheet(value))
def _status_changed(self, event):
"""Update status bar.
Parameters
----------
event : napari.utils.event.Event
The napari event that triggered this method.
"""
if isinstance(event.value, str):
self._status_bar.setStatusText(event.value)
else:
status_info = event.value
self._status_bar.setStatusText(
layer_base=status_info['layer_base'],
source_type=status_info['source_type'],
plugin=status_info['plugin'],
coordinates=status_info['coordinates'],
)
def _title_changed(self, event):
"""Update window title.
Parameters
----------
event : napari.utils.event.Event
The napari event that triggered this method.
"""
self._qt_window.setWindowTitle(event.value)
def _help_changed(self, event):
"""Update help message on status bar.
Parameters
----------
event : napari.utils.event.Event
The napari event that triggered this method.
"""
self._status_bar.setHelpText(event.value)
def _restart(self):
"""Restart the napari application."""
self._qt_window.restart()
def _screenshot(
self, size=None, scale=None, flash=True, canvas_only=False
) -> 'QImage':
"""Capture screenshot of the currently displayed viewer.
Parameters
----------
flash : bool
Flag to indicate whether flash animation should be shown after
the screenshot was captured.
size : tuple (int, int)
Size (resolution) of the screenshot. By default, the currently displayed size.
Only used if `canvas_only` is True.
scale : float
Scale factor used to increase resolution of canvas for the screenshot. By default, the currently displayed resolution.
Only used if `canvas_only` is True.
canvas_only : bool
If True, screenshot shows only the image display canvas, and
if False include the napari viewer frame in the screenshot,
By default, True.
Returns
-------
img : QImage
"""
from .utils import add_flash_animation
if canvas_only:
canvas = self._qt_viewer.canvas
prev_size = canvas.size
if size is not None:
if len(size) != 2:
raise ValueError(
trans._(
'screenshot size must be 2 values, got {len_size}',
len_size=len(size),
)
)
# Scale the requested size to account for HiDPI
size = tuple(
int(dim / self._qt_window.devicePixelRatio())
for dim in size
)
canvas.size = size[::-1] # invert x ad y for vispy
if scale is not None:
# multiply canvas dimensions by the scale factor to get new size
canvas.size = tuple(int(dim * scale) for dim in canvas.size)
try:
img = self._qt_viewer.canvas.native.grabFramebuffer()
if flash:
add_flash_animation(self._qt_viewer._canvas_overlay)
finally:
# make sure we always go back to the right canvas size
if size is not None or scale is not None:
canvas.size = prev_size
else:
img = self._qt_window.grab().toImage()
if flash:
add_flash_animation(self._qt_window)
return img
[docs] def screenshot(
self, path=None, size=None, scale=None, flash=True, canvas_only=False
):
"""Take currently displayed viewer and convert to an image array.
Parameters
----------
path : str
Filename for saving screenshot image.
size : tuple (int, int)
Size (resolution) of the screenshot. By default, the currently displayed size.
Only used if `canvas_only` is True.
scale : float
Scale factor used to increase resolution of canvas for the screenshot. By default, the currently displayed resolution.
Only used if `canvas_only` is True.
flash : bool
Flag to indicate whether flash animation should be shown after
the screenshot was captured.
canvas_only : bool
If True, screenshot shows only the image display canvas, and
if False include the napari viewer frame in the screenshot,
By default, True.
Returns
-------
image : array
Numpy array of type ubyte and shape (h, w, 4). Index [0, 0] is the
upper-left corner of the rendered region.
"""
img = QImg2array(self._screenshot(size, scale, flash, canvas_only))
if path is not None:
imsave(path, img) # scikit-image imsave method
return img
[docs] def clipboard(self, flash=True, canvas_only=False):
"""Copy screenshot of current viewer to the clipboard.
Parameters
----------
flash : bool
Flag to indicate whether flash animation should be shown after
the screenshot was captured.
canvas_only : bool
If True, screenshot shows only the image display canvas, and
if False include the napari viewer frame in the screenshot,
By default, True.
"""
img = self._screenshot(flash=flash, canvas_only=canvas_only)
QApplication.clipboard().setImage(img)
def _teardown(self):
"""Carry out various teardown tasks such as event disconnection."""
self._setup_existing_themes(False)
_themes.events.added.disconnect(self._add_theme)
_themes.events.removed.disconnect(self._remove_theme)
self._qt_viewer.viewer.layers.events.disconnect(self.file_menu.update)
for menu in self.file_menu._INSTANCES:
with contextlib.suppress(RuntimeError):
menu._destroy()
[docs] def close(self):
"""Close the viewer window and cleanup sub-widgets."""
# Someone is closing us twice? Only try to delete self._qt_window
# if we still have one.
if hasattr(self, '_qt_window'):
self._teardown()
self._qt_viewer.close()
self._qt_window.close()
del self._qt_window
def _instantiate_dock_widget(wdg_cls, viewer: 'Viewer'):
# if the signature is looking a for a napari viewer, pass it.
from ..viewer import Viewer
kwargs = {}
try:
sig = inspect.signature(wdg_cls.__init__)
except ValueError:
pass
else:
for param in sig.parameters.values():
if param.name == 'napari_viewer':
kwargs['napari_viewer'] = PublicOnlyProxy(viewer)
break
if param.annotation in ('napari.viewer.Viewer', Viewer):
kwargs[param.name] = PublicOnlyProxy(viewer)
break
# cannot look for param.kind == param.VAR_KEYWORD because
# QWidget allows **kwargs but errs on unknown keyword arguments
# instantiate the widget
return wdg_cls(**kwargs)