class QtViewer(QSplitter):
"""Qt view for the napari Viewer model.
Parameters
----------
viewer : napari.components.ViewerModel
Napari viewer containing the rendered scene, layers, and controls.
show_welcome_screen : bool, optional
Flag to show a welcome message when no layers are present in the
canvas. Default is `False`.
Attributes
----------
canvas : vispy.scene.SceneCanvas
Canvas for rendering the current view.
console : QtConsole
IPython console terminal integrated into the napari GUI.
controls : QtLayerControlsContainer
Qt view for GUI controls.
dims : napari.qt_dims.QtDims
Dimension sliders; Qt View for Dims model.
dockConsole : QtViewerDockWidget
QWidget wrapped in a QDockWidget with forwarded viewer events.
aboutKeybindings : QtAboutKeybindings
Key bindings for the 'About' Qt dialog.
dockLayerControls : QtViewerDockWidget
QWidget wrapped in a QDockWidget with forwarded viewer events.
dockLayerList : QtViewerDockWidget
QWidget wrapped in a QDockWidget with forwarded viewer events.
layerButtons : QtLayerButtons
Button controls for napari layers.
layers : QtLayerList
Qt view for LayerList controls.
layer_to_visual : dict
Dictionary mapping napari layers with their corresponding vispy_layers.
view : vispy scene widget
View displayed by vispy canvas. Adds a vispy ViewBox as a child widget.
viewer : napari.components.ViewerModel
Napari viewer containing the rendered scene, layers, and controls.
viewerButtons : QtViewerButtons
Button controls for the napari viewer.
"""
_instances = WeakSet()
def __init__(self, viewer: ViewerModel, show_welcome_screen: bool = False):
# Avoid circular import.
from .layer_controls import QtLayerControlsContainer
super().__init__()
self._instances.add(self)
self.setAttribute(Qt.WA_DeleteOnClose)
self._show_welcome_screen = show_welcome_screen
QCoreApplication.setAttribute(
Qt.AA_UseStyleSheetPropagationInWidgetStyles, True
)
self.viewer = viewer
self.dims = QtDims(self.viewer.dims)
self.controls = QtLayerControlsContainer(self.viewer)
self.layers = QtLayerList(self.viewer.layers)
self.layerButtons = QtLayerButtons(self.viewer)
self.viewerButtons = QtViewerButtons(self.viewer)
self._key_map_handler = KeymapHandler()
self._key_map_handler.keymap_providers = [self.viewer]
self._console = None
layerList = QWidget()
layerList.setObjectName('layerList')
layerListLayout = QVBoxLayout()
layerListLayout.addWidget(self.layerButtons)
layerListLayout.addWidget(self.layers)
layerListLayout.addWidget(self.viewerButtons)
layerListLayout.setContentsMargins(8, 4, 8, 6)
layerList.setLayout(layerListLayout)
self.dockLayerList = QtViewerDockWidget(
self,
layerList,
name=trans._('layer list'),
area='left',
allowed_areas=['left', 'right'],
object_name='layer list',
close_btn=False,
)
self.dockLayerControls = QtViewerDockWidget(
self,
self.controls,
name=trans._('layer controls'),
area='left',
allowed_areas=['left', 'right'],
object_name='layer controls',
close_btn=False,
)
self.dockConsole = QtViewerDockWidget(
self,
QWidget(),
name=trans._('console'),
area='bottom',
allowed_areas=['top', 'bottom'],
object_name='console',
close_btn=False,
)
self.dockConsole.setVisible(False)
# because the console is loaded lazily in the @getter, this line just
# gets (or creates) the console when the dock console is made visible.
self.dockConsole.visibilityChanged.connect(self._ensure_connect)
# Only created if using perfmon.
self.dockPerformance = self._create_performance_dock_widget()
# This dictionary holds the corresponding vispy visual for each layer
self.layer_to_visual = {}
self._create_canvas()
# Stacked widget to provide a welcome page
self._canvas_overlay = QtWidgetOverlay(self, self.canvas.native)
self._canvas_overlay.set_welcome_visible(show_welcome_screen)
self._canvas_overlay.sig_dropped.connect(self.dropEvent)
self._canvas_overlay.leave.connect(self._leave_canvas)
self._canvas_overlay.enter.connect(self._enter_canvas)
main_widget = QWidget()
main_layout = QVBoxLayout()
main_layout.setContentsMargins(0, 2, 0, 2)
main_layout.addWidget(self._canvas_overlay)
main_layout.addWidget(self.dims)
main_layout.setSpacing(0)
main_widget.setLayout(main_layout)
self.setOrientation(Qt.Vertical)
self.addWidget(main_widget)
self._cursors = {
'cross': Qt.CrossCursor,
'forbidden': Qt.ForbiddenCursor,
'pointing': Qt.PointingHandCursor,
'standard': QCursor(),
}
self._on_active_change()
self.viewer.layers.events.inserted.connect(self._update_welcome_screen)
self.viewer.layers.events.removed.connect(self._update_welcome_screen)
self.viewer.layers.selection.events.active.connect(
self._on_active_change
)
self.viewer.camera.events.interactive.connect(self._on_interactive)
self.viewer.cursor.events.style.connect(self._on_cursor)
self.viewer.cursor.events.size.connect(self._on_cursor)
self.viewer.layers.events.reordered.connect(self._reorder_layers)
self.viewer.layers.events.inserted.connect(self._on_add_layer_change)
self.viewer.layers.events.removed.connect(self._remove_layer)
self.setAcceptDrops(True)
for layer in self.viewer.layers:
self._add_layer(layer)
self.view = self.canvas.central_widget.add_view(border_width=0)
self.camera = VispyCamera(
self.view, self.viewer.camera, self.viewer.dims
)
self.canvas.events.draw.connect(self.camera.on_draw)
# Add axes, scale bar
self._add_visuals()
# Create the experimental QtPool for octree and/or monitor.
self._qt_poll = _create_qt_poll(self, self.viewer.camera)
# Create the experimental RemoteManager for the monitor.
self._remote_manager = _create_remote_manager(
self.viewer.layers, self._qt_poll
)
# moved from the old layerlist... still feels misplaced.
# can you help me move this elsewhere?
if config.async_loading:
from .experimental.qt_chunk_receiver import QtChunkReceiver
# The QtChunkReceiver object allows the ChunkLoader to pass newly
# loaded chunks to the layers that requested them.
self.chunk_receiver = QtChunkReceiver(self.layers)
else:
self.chunk_receiver = None
# bind shortcuts stored in settings last.
self._bind_shortcuts()
def _leave_canvas(self):
"""disable status on canvas leave"""
self.viewer.status = ""
self.viewer._mouse_over_canvas = False
def _enter_canvas(self):
"""enable status on canvas enter"""
self.viewer.status = "Ready"
self.viewer._mouse_over_canvas = True
def _ensure_connect(self):
# lazy load console
id(self.console)
def _bind_shortcuts(self):
"""Bind shortcuts stored in SETTINGS to actions."""
for action, shortcuts in get_settings().shortcuts.shortcuts.items():
action_manager.unbind_shortcut(action)
for shortcut in shortcuts:
action_manager.bind_shortcut(action, shortcut)
def _create_canvas(self) -> None:
"""Create the canvas and hook up events."""
self.canvas = VispyCanvas(
keys=None,
vsync=True,
parent=self,
size=self.viewer._canvas_size[::-1],
)
self.canvas.events.draw.connect(self.dims.enable_play)
self.canvas.events.mouse_double_click.connect(
self.on_mouse_double_click
)
self.canvas.events.mouse_move.connect(self.on_mouse_move)
self.canvas.events.mouse_press.connect(self.on_mouse_press)
self.canvas.events.mouse_release.connect(self.on_mouse_release)
self.canvas.events.key_press.connect(
self._key_map_handler.on_key_press
)
self.canvas.events.key_release.connect(
self._key_map_handler.on_key_release
)
self.canvas.events.mouse_wheel.connect(self.on_mouse_wheel)
self.canvas.events.draw.connect(self.on_draw)
self.canvas.events.resize.connect(self.on_resize)
self.canvas.bgcolor = transform_color(
get_theme(self.viewer.theme, False).canvas.as_hex()
)[0]
theme = self.viewer.events.theme
on_theme_change = self.canvas._on_theme_change
theme.connect(on_theme_change)
self.canvas.destroyed.connect(self._diconnect_theme)
def _diconnect_theme(self):
self.viewer.events.theme.disconnect(self.canvas._on_theme_change)
def _add_visuals(self) -> None:
"""Add visuals for axes, scale bar, and welcome text."""
self.axes = VispyAxesOverlay(
self.viewer,
parent=self.view.scene,
order=1e6,
)
self.scale_bar = VispyScaleBarOverlay(
self.viewer,
parent=self.view,
order=1e6 + 1,
)
self.canvas.events.resize.connect(self.scale_bar._on_position_change)
self.text_overlay = VispyTextOverlay(
self.viewer,
parent=self.view,
order=1e6 + 2,
)
self.canvas.events.resize.connect(
self.text_overlay._on_position_change
)
self.interaction_box_visual = VispyInteractionBox(
self.viewer, parent=self.view.scene, order=1e6 + 3
)
self.interaction_box_mousebindings = InteractionBoxMouseBindings(
self.viewer, self.interaction_box_visual
)
def _create_performance_dock_widget(self):
"""Create the dock widget that shows performance metrics."""
if perf.USE_PERFMON:
return QtViewerDockWidget(
self,
QtPerformance(),
name=trans._('performance'),
area='bottom',
)
return None
@property
def console(self):
"""QtConsole: iPython console terminal integrated into the napari GUI."""
if self._console is None:
try:
from napari_console import QtConsole
import napari
with warnings.catch_warnings():
warnings.filterwarnings("ignore")
self.console = QtConsole(self.viewer)
self.console.push(
{'napari': napari, 'action_manager': action_manager}
)
except ModuleNotFoundError:
warnings.warn(
trans._(
'napari-console not found. It can be installed with'
' "pip install napari_console"'
)
)
self._console = None
except ImportError:
traceback.print_exc()
warnings.warn(
trans._(
'error importing napari-console. See console for full error.'
)
)
self._console = None
return self._console
@console.setter
def console(self, console):
self._console = console
if console is not None:
self.dockConsole.setWidget(console)
console.setParent(self.dockConsole)
def _on_active_change(self):
"""When active layer changes change keymap handler."""
self._key_map_handler.keymap_providers = (
[self.viewer]
if self.viewer.layers.selection.active is None
else [self.viewer.layers.selection.active, self.viewer]
)
def _on_add_layer_change(self, event):
"""When a layer is added, set its parent and order.
Parameters
----------
event : napari.utils.event.Event
The napari event that triggered this method.
"""
layer = event.value
self._add_layer(layer)
def _add_layer(self, layer):
"""When a layer is added, set its parent and order.
Parameters
----------
layer : napari.layers.Layer
Layer to be added.
"""
vispy_layer = create_vispy_visual(layer)
# QtPoll is experimental.
if self._qt_poll is not None:
# QtPoll will call VipyBaseImage._on_poll() when the camera
# moves or the timer goes off.
self._qt_poll.events.poll.connect(vispy_layer._on_poll)
# In the other direction, some visuals need to tell QtPoll to
# start polling. When they receive new data they need to be
# polled to load it, even if the camera is not moving.
if vispy_layer.events is not None:
vispy_layer.events.loaded.connect(self._qt_poll.wake_up)
vispy_layer.node.parent = self.view.scene
self.layer_to_visual[layer] = vispy_layer
self._reorder_layers()
def _remove_layer(self, event):
"""When a layer is removed, remove its parent.
Parameters
----------
event : napari.utils.event.Event
The napari event that triggered this method.
"""
layer = event.value
vispy_layer = self.layer_to_visual[layer]
vispy_layer.close()
del vispy_layer
del self.layer_to_visual[layer]
self._reorder_layers()
def _reorder_layers(self):
"""When the list is reordered, propagate changes to draw order."""
for i, layer in enumerate(self.viewer.layers):
vispy_layer = self.layer_to_visual[layer]
vispy_layer.order = i
self.canvas._draw_order.clear()
self.canvas.update()
def _save_layers_dialog(self, selected=False):
"""Save layers (all or selected) to disk, using ``LayerList.save()``.
Parameters
----------
selected : bool
If True, only layers that are selected in the viewer will be saved.
By default, all layers are saved.
"""
msg = ''
if not len(self.viewer.layers):
msg = trans._("There are no layers in the viewer to save")
elif selected and not len(self.viewer.layers.selection):
msg = trans._(
'Please select one or more layers to save,'
'\nor use "Save all layers..."'
)
if msg:
raise OSError(trans._("Nothing to save"))
# prepare list of extensions for drop down menu.
ext_str, writers = _extension_string_for_layers(
list(self.viewer.layers.selection)
if selected
else self.viewer.layers
)
msg = trans._("selected") if selected else trans._("all")
dlg = QFileDialog()
hist = get_save_history()
dlg.setHistory(hist)
filename, selected_filter = dlg.getSaveFileName(
parent=self,
caption=trans._('Save {msg} layers', msg=msg),
directory=hist[0], # home dir by default,
filter=ext_str,
options=(
QFileDialog.DontUseNativeDialog
if in_ipython()
else QFileDialog.Options()
),
)
logging.debug(
f'QFileDialog - filename: {filename or None} '
f'selected_filter: {selected_filter or None}'
)
if filename:
writer = _npe2_decode_selected_filter(
ext_str, selected_filter, writers
)
with warnings.catch_warnings(record=True) as wa:
saved = self.viewer.layers.save(
filename, selected=selected, _writer=writer
)
logging.debug(f'Saved {saved}')
error_messages = "\n".join(str(x.message.args[0]) for x in wa)
if not saved:
raise OSError(
trans._(
"File {filename} save failed.\n{error_messages}",
deferred=True,
filename=filename,
error_messages=error_messages,
)
)
else:
update_save_history(saved[0])
def _update_welcome_screen(self):
"""Update welcome screen display based on layer count."""
if self._show_welcome_screen:
self._canvas_overlay.set_welcome_visible(not self.viewer.layers)
def _screenshot(self, flash=True):
"""Capture a screenshot of the Vispy canvas.
Parameters
----------
flash : bool
Flag to indicate whether flash animation should be shown after
the screenshot was captured.
"""
# CAN REMOVE THIS AFTER DEPRECATION IS DONE, see self.screenshot.
img = self.canvas.native.grabFramebuffer()
if flash:
from .utils import add_flash_animation
# Here we are actually applying the effect to the `_canvas_overlay`
# and not # the `native` widget because it does not work on the
# `native` widget. It's probably because the widget is in a stack
# with the `QtWelcomeWidget`.
add_flash_animation(self._canvas_overlay)
return img
def screenshot(self, path=None, flash=True):
"""Take currently displayed screen and convert to an image array.
Parameters
----------
path : str
Filename for saving screenshot image.
flash : bool
Flag to indicate whether flash animation should be shown after
the screenshot was captured.
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(flash))
if path is not None:
imsave(path, img) # scikit-image imsave method
return img
def clipboard(self, flash=True):
"""Take a screenshot of the currently displayed screen and copy the
image to the clipboard.
Parameters
----------
flash : bool
Flag to indicate whether flash animation should be shown after
the screenshot was captured.
"""
cb = QGuiApplication.clipboard()
cb.setImage(self._screenshot(flash))
def _screenshot_dialog(self):
"""Save screenshot of current display, default .png"""
hist = get_save_history()
dial = ScreenshotDialog(self.screenshot, self, hist[0], hist)
if dial.exec_():
update_save_history(dial.selectedFiles()[0])
def _open_files_dialog(self):
"""Add files from the menubar."""
dlg = QFileDialog()
hist = get_open_history()
dlg.setHistory(hist)
filenames, _ = dlg.getOpenFileNames(
parent=self,
caption=trans._('Select file(s)...'),
directory=hist[0],
options=(
QFileDialog.DontUseNativeDialog
if in_ipython()
else QFileDialog.Options()
),
)
if (filenames != []) and (filenames is not None):
for filename in filenames:
self._qt_open([filename], stack=False)
update_open_history(filenames[0])
def _open_files_dialog_as_stack_dialog(self):
"""Add files as a stack, from the menubar."""
dlg = QFileDialog()
hist = get_open_history()
dlg.setHistory(hist)
filenames, _ = dlg.getOpenFileNames(
parent=self,
caption=trans._('Select files...'),
directory=hist[0], # home dir by default
options=(
QFileDialog.DontUseNativeDialog
if in_ipython()
else QFileDialog.Options()
),
)
if (filenames != []) and (filenames is not None):
self._qt_open(filenames, stack=True)
update_open_history(filenames[0])
def _open_folder_dialog(self):
"""Add a folder of files from the menubar."""
dlg = QFileDialog()
hist = get_open_history()
dlg.setHistory(hist)
folder = dlg.getExistingDirectory(
parent=self,
caption=trans._('Select folder...'),
directory=hist[0], # home dir by default
options=(
QFileDialog.DontUseNativeDialog
if in_ipython()
else QFileDialog.Options()
),
)
if folder not in {'', None}:
self._qt_open([folder], stack=False)
update_open_history(folder)
def _qt_open(
self,
filenames: List[str],
stack: bool,
plugin: str = None,
layer_type: str = None,
**kwargs,
):
"""Open files, potentially popping reader dialog for plugin selection.
Call ViewerModel._open_or_raise_error and catch errors that could
be fixed by user making a plugin choice.
Parameters
----------
filenames : List[str]
paths to open
stack : bool
whether to stack files or not
"""
try:
self.viewer.open(
filenames,
stack=stack,
plugin=plugin,
layer_type=layer_type,
**kwargs,
)
except ReaderPluginError as e:
handle_gui_reading(
filenames,
self,
stack,
e.reader_plugin,
e,
layer_type=layer_type,
**kwargs,
)
except MultipleReaderError:
handle_gui_reading(filenames, self, stack, **kwargs)
def _toggle_chunk_outlines(self):
"""Toggle whether we are drawing outlines around the chunks."""
from ..layers.image.experimental.octree_image import _OctreeImageBase
for layer in self.viewer.layers:
if isinstance(layer, _OctreeImageBase):
layer.display.show_grid = not layer.display.show_grid
def _on_interactive(self):
"""Link interactive attributes of view and viewer."""
self.view.interactive = self.viewer.camera.interactive
def _on_cursor(self):
"""Set the appearance of the mouse cursor."""
cursor = self.viewer.cursor.style
# Scale size by zoom if needed
if self.viewer.cursor.scaled:
size = self.viewer.cursor.size * self.viewer.camera.zoom
else:
size = self.viewer.cursor.size
if cursor == 'square':
# make sure the square fits within the current canvas
if size < 8 or size > (
min(*self.viewer.window._qt_viewer.canvas.size) - 4
):
q_cursor = self._cursors['cross']
else:
q_cursor = QCursor(square_pixmap(size))
elif cursor == 'circle':
q_cursor = QCursor(circle_pixmap(size))
elif cursor == 'crosshair':
q_cursor = QCursor(crosshair_pixmap())
else:
q_cursor = self._cursors[cursor]
self.canvas.native.setCursor(q_cursor)
def toggle_console_visibility(self, event=None):
"""Toggle console visible and not visible.
Imports the console the first time it is requested.
"""
if in_ipython():
return
# force instantiation of console if not already instantiated
_ = self.console
viz = not self.dockConsole.isVisible()
# modulate visibility at the dock widget level as console is dockable
self.dockConsole.setVisible(viz)
if self.dockConsole.isFloating():
self.dockConsole.setFloating(True)
if viz:
self.dockConsole.raise_()
self.viewerButtons.consoleButton.setProperty(
'expanded', self.dockConsole.isVisible()
)
self.viewerButtons.consoleButton.style().unpolish(
self.viewerButtons.consoleButton
)
self.viewerButtons.consoleButton.style().polish(
self.viewerButtons.consoleButton
)
def _map_canvas2world(self, position):
"""Map position from canvas pixels into world coordinates.
Parameters
----------
position : 2-tuple
Position in canvas (x, y).
Returns
-------
coords : tuple
Position in world coordinates, matches the total dimensionality
of the viewer.
"""
nd = self.viewer.dims.ndisplay
transform = self.view.scene.transform
mapped_position = transform.imap(list(position))[:nd]
position_world_slice = mapped_position[::-1]
# handle position for 3D views of 2D data
nd_point = len(self.viewer.dims.point)
if nd_point < nd:
position_world_slice = position_world_slice[-nd_point:]
position_world = list(self.viewer.dims.point)
for i, d in enumerate(self.viewer.dims.displayed):
position_world[d] = position_world_slice[i]
return tuple(position_world)
@property
def _canvas_corners_in_world(self):
"""Location of the corners of canvas in world coordinates.
Returns
-------
corners : 2-tuple
Coordinates of top left and bottom right canvas pixel in the world.
"""
# Find corners of canvas in world coordinates
top_left = self._map_canvas2world([0, 0])
bottom_right = self._map_canvas2world(self.canvas.size)
return np.array([top_left, bottom_right])
def on_resize(self, event):
"""Called whenever canvas is resized.
event : vispy.util.event.Event
The vispy event that triggered this method.
"""
self.viewer._canvas_size = tuple(self.canvas.size[::-1])
def _process_mouse_event(self, mouse_callbacks, event):
"""Add properties to the mouse event before passing the event to the
napari events system. Called whenever the mouse moves or is clicked.
As such, care should be taken to reduce the overhead in this function.
In future work, we should consider limiting the frequency at which
it is called.
This method adds following:
position: the position of the click in world coordinates.
view_direction: a unit vector giving the direction of the camera in
world coordinates.
up_direction: a unit vector giving the direction of the camera that is
up in world coordinates.
dims_displayed: a list of the dimensions currently being displayed
in the viewer. This comes from viewer.dims.displayed.
dims_point: the indices for the data in view in world coordinates.
This comes from viewer.dims.point
Parameters
----------
mouse_callbacks : function
Mouse callbacks function.
event : vispy.event.Event
The vispy event that triggered this method.
"""
if event.pos is None:
return
# Add the view ray to the event
event.view_direction = self.viewer.camera.calculate_nd_view_direction(
self.viewer.dims.ndim, self.viewer.dims.displayed
)
event.up_direction = self.viewer.camera.calculate_nd_up_direction(
self.viewer.dims.ndim, self.viewer.dims.displayed
)
# Update the cursor position
self.viewer.cursor._view_direction = event.view_direction
self.viewer.cursor.position = self._map_canvas2world(list(event.pos))
# Add the cursor position to the event
event.position = self.viewer.cursor.position
# Add the displayed dimensions to the event
event.dims_displayed = list(self.viewer.dims.displayed)
# Add the current dims indices
event.dims_point = list(self.viewer.dims.point)
# Put a read only wrapper on the event
event = ReadOnlyWrapper(event)
mouse_callbacks(self.viewer, event)
layer = self.viewer.layers.selection.active
if layer is not None:
mouse_callbacks(layer, event)
def on_mouse_wheel(self, event):
"""Called whenever mouse wheel activated in canvas.
Parameters
----------
event : vispy.event.Event
The vispy event that triggered this method.
"""
self._process_mouse_event(mouse_wheel_callbacks, event)
def on_mouse_double_click(self, event):
"""Called whenever a mouse double-click happen on the canvas
Parameters
----------
event : vispy.event.Event
The vispy event that triggered this method. The `event.type` will always be `mouse_double_click`
Notes
-----
Note that this triggers in addition to the usual mouse press and mouse release.
Therefore a double click from the user will likely triggers the following event in sequence:
- mouse_press
- mouse_release
- mouse_double_click
- mouse_release
"""
self._process_mouse_event(mouse_double_click_callbacks, event)
def on_mouse_press(self, event):
"""Called whenever mouse pressed in canvas.
Parameters
----------
event : vispy.event.Event
The vispy event that triggered this method.
"""
self._process_mouse_event(mouse_press_callbacks, event)
def on_mouse_move(self, event):
"""Called whenever mouse moves over canvas.
Parameters
----------
event : vispy.event.Event
The vispy event that triggered this method.
"""
self._process_mouse_event(mouse_move_callbacks, event)
def on_mouse_release(self, event):
"""Called whenever mouse released in canvas.
Parameters
----------
event : vispy.event.Event
The vispy event that triggered this method.
"""
self._process_mouse_event(mouse_release_callbacks, event)
def on_draw(self, event):
"""Called whenever the canvas is drawn.
This is triggered from vispy whenever new data is sent to the canvas or
the camera is moved and is connected in the `QtViewer`.
"""
for layer in self.viewer.layers:
if layer.ndim <= self.viewer.dims.ndim:
nd = len(layer._displayed_axes)
if nd > self.viewer.dims.ndisplay:
displayed_axes = layer._displayed_axes
else:
displayed_axes = self.viewer.dims.displayed[-nd:]
layer._update_draw(
scale_factor=1 / self.viewer.camera.zoom,
corner_pixels_displayed=self._canvas_corners_in_world[
:, displayed_axes
],
shape_threshold=self.canvas.size,
)
def set_welcome_visible(self, visible):
"""Show welcome screen widget."""
self._show_welcome_screen = visible
self._canvas_overlay.set_welcome_visible(visible)
def keyPressEvent(self, event):
"""Called whenever a key is pressed.
Parameters
----------
event : qtpy.QtCore.QEvent
Event from the Qt context.
"""
self.canvas._backend._keyEvent(self.canvas.events.key_press, event)
event.accept()
def keyReleaseEvent(self, event):
"""Called whenever a key is released.
Parameters
----------
event : qtpy.QtCore.QEvent
Event from the Qt context.
"""
self.canvas._backend._keyEvent(self.canvas.events.key_release, event)
event.accept()
def dragEnterEvent(self, event):
"""Ignore event if not dragging & dropping a file or URL to open.
Using event.ignore() here allows the event to pass through the
parent widget to its child widget, otherwise the parent widget
would catch the event and not pass it on to the child widget.
Parameters
----------
event : qtpy.QtCore.QEvent
Event from the Qt context.
"""
if event.mimeData().hasUrls():
event.accept()
else:
event.ignore()
def dropEvent(self, event):
"""Add local files and web URLS with drag and drop.
For each file, attempt to open with existing associated reader
(if available). If no reader is associated or opening fails,
and more than one reader is available, open dialog and ask
user to choose among available readers. User can choose to persist
this choice.
Parameters
----------
event : qtpy.QtCore.QEvent
Event from the Qt context.
"""
shift_down = QGuiApplication.keyboardModifiers() & Qt.ShiftModifier
filenames = []
for url in event.mimeData().urls():
if url.isLocalFile():
# directories get a trailing "/", Path conversion removes it
filenames.append(str(Path(url.toLocalFile())))
else:
filenames.append(url.toString())
# if trying to open as a stack, open with any available reader
if shift_down:
self._qt_open(filenames, stack=bool(shift_down))
return
for filename in filenames:
self._qt_open([filename], stack=bool(shift_down))
def closeEvent(self, event):
"""Cleanup and close.
Parameters
----------
event : qtpy.QtCore.QEvent
Event from the Qt context.
"""
self.layers.close()
# if the viewer.QtDims object is playing an axis, we need to terminate
# the AnimationThread before close, otherwise it will cauyse a segFault
# or Abort trap. (calling stop() when no animation is occurring is also
# not a problem)
self.dims.stop()
self.canvas.native.deleteLater()
if self._console is not None:
self.console.close()
self.dockConsole.deleteLater()
event.accept()
class QtViewer(QSplitter):
"""Qt view for the napari Viewer model.
Parameters
----------
viewer : napari.components.ViewerModel
Napari viewer containing the rendered scene, layers, and controls.
show_welcome_screen : bool, optional
Flag to show a welcome message when no layers are present in the
canvas. Default is `False`.
Attributes
----------
canvas : vispy.scene.SceneCanvas
Canvas for rendering the current view.
console : QtConsole
iPython console terminal integrated into the napari GUI.
controls : QtLayerControlsContainer
Qt view for GUI controls.
dims : napari.qt_dims.QtDims
Dimension sliders; Qt View for Dims model.
dockConsole : QtViewerDockWidget
QWidget wrapped in a QDockWidget with forwarded viewer events.
aboutKeybindings : QtAboutKeybindings
Key bindings for the 'About' Qt dialog.
dockLayerControls : QtViewerDockWidget
QWidget wrapped in a QDockWidget with forwarded viewer events.
dockLayerList : QtViewerDockWidget
QWidget wrapped in a QDockWidget with forwarded viewer events.
layerButtons : QtLayerButtons
Button controls for napari layers.
layers : QtLayerList
Qt view for LayerList controls.
layer_to_visual : dict
Dictionary mapping napari layers with their corresponding vispy_layers.
view : vispy scene widget
View displayed by vispy canvas. Adds a vispy ViewBox as a child widget.
viewer : napari.components.ViewerModel
Napari viewer containing the rendered scene, layers, and controls.
viewerButtons : QtViewerButtons
Button controls for the napari viewer.
"""
def __init__(self, viewer: Viewer, show_welcome_screen: bool = False):
# Avoid circular import.
from .layer_controls import QtLayerControlsContainer
super().__init__()
self.setAttribute(Qt.WA_DeleteOnClose)
self._show_welcome_screen = show_welcome_screen
QCoreApplication.setAttribute(
Qt.AA_UseStyleSheetPropagationInWidgetStyles, True
)
self.viewer = viewer
self.dims = QtDims(self.viewer.dims)
self.controls = QtLayerControlsContainer(self.viewer)
self.layers = QtLayerList(self.viewer.layers)
self.layerButtons = QtLayerButtons(self.viewer)
self.viewerButtons = QtViewerButtons(self.viewer)
self._key_map_handler = KeymapHandler()
self._key_map_handler.keymap_providers = [self.viewer]
self._key_bindings_dialog = None
self._console = None
layerList = QWidget()
layerList.setObjectName('layerList')
layerListLayout = QVBoxLayout()
layerListLayout.addWidget(self.layerButtons)
layerListLayout.addWidget(self.layers)
layerListLayout.addWidget(self.viewerButtons)
layerListLayout.setContentsMargins(8, 4, 8, 6)
layerList.setLayout(layerListLayout)
activityDock = QtActivityDock()
activityDock.setObjectName('activityDock')
self.dockLayerList = QtViewerDockWidget(
self,
layerList,
name=trans._('layer list'),
area='left',
allowed_areas=['left', 'right'],
object_name='layer list',
)
self.dockLayerControls = QtViewerDockWidget(
self,
self.controls,
name=trans._('layer controls'),
area='left',
allowed_areas=['left', 'right'],
object_name='layer controls',
)
self.activityDock = QtViewerDockWidget(
self,
activityDock,
name=trans._('activity dock'),
area='right',
allowed_areas=['right', 'bottom'],
object_name='activity dock',
)
self.dockConsole = QtViewerDockWidget(
self,
QWidget(),
name=trans._('console'),
area='bottom',
allowed_areas=['top', 'bottom'],
object_name='console',
)
self.dockConsole.setVisible(False)
# because the console is loaded lazily in the @getter, this line just
# gets (or creates) the console when the dock console is made visible.
self.dockConsole.visibilityChanged.connect(
lambda visible: self.console if visible else None
)
self.dockLayerControls.visibilityChanged.connect(self._constrain_width)
self.dockLayerList.setMaximumWidth(258)
self.dockLayerList.setMinimumWidth(258)
self.activityDock.setVisible(False)
# Only created if using perfmon.
self.dockPerformance = self._create_performance_dock_widget()
# This dictionary holds the corresponding vispy visual for each layer
self.layer_to_visual = {}
action_manager.register_action(
"napari:toggle_console_visibility",
self.toggle_console_visibility,
trans._("Show/Hide IPython console"),
self.viewer,
)
action_manager.bind_button(
'napari:toggle_console_visibility',
self.viewerButtons.consoleButton,
)
action_manager.bind_shortcut(
'napari:toggle_console_visibility', 'Control-Shift-C'
)
self._create_canvas()
# Stacked widget to provide a welcome page
self._canvas_overlay = QtWidgetOverlay(self, self.canvas.native)
self._canvas_overlay.set_welcome_visible(show_welcome_screen)
self._canvas_overlay.sig_dropped.connect(self.dropEvent)
main_widget = QWidget()
main_layout = QVBoxLayout()
main_layout.setContentsMargins(10, 22, 10, 2)
main_layout.addWidget(self._canvas_overlay)
main_layout.addWidget(self.dims)
main_layout.setSpacing(10)
main_widget.setLayout(main_layout)
self.setOrientation(Qt.Vertical)
self.addWidget(main_widget)
self._cursors = {
'cross': Qt.CrossCursor,
'forbidden': Qt.ForbiddenCursor,
'pointing': Qt.PointingHandCursor,
'standard': QCursor(),
}
self._on_active_change()
self.viewer.layers.events.inserted.connect(self._update_welcome_screen)
self.viewer.layers.events.removed.connect(self._update_welcome_screen)
self.viewer.layers.selection.events.active.connect(
self._on_active_change
)
self.viewer.camera.events.interactive.connect(self._on_interactive)
self.viewer.cursor.events.style.connect(self._on_cursor)
self.viewer.cursor.events.size.connect(self._on_cursor)
self.viewer.layers.events.reordered.connect(self._reorder_layers)
self.viewer.layers.events.inserted.connect(self._on_add_layer_change)
self.viewer.layers.events.removed.connect(self._remove_layer)
# stop any animations whenever the layers change
self.viewer.events.layers_change.connect(lambda x: self.dims.stop())
self.setAcceptDrops(True)
for layer in self.viewer.layers:
self._add_layer(layer)
self.view = self.canvas.central_widget.add_view()
self.camera = VispyCamera(
self.view, self.viewer.camera, self.viewer.dims
)
self.canvas.connect(self.camera.on_draw)
# Add axes, scale bar
self._add_visuals()
# Create the experimental QtPool for octree and/or monitor.
self._qt_poll = _create_qt_poll(self, self.viewer.camera)
# Create the experimental RemoteManager for the monitor.
self._remote_manager = _create_remote_manager(
self.viewer.layers, self._qt_poll
)
# moved from the old layerlist... still feels misplaced.
# can you help me move this elsewhere?
if config.async_loading:
from .experimental.qt_chunk_receiver import QtChunkReceiver
# The QtChunkReceiver object allows the ChunkLoader to pass newly
# loaded chunks to the layers that requested them.
self.chunk_receiver = QtChunkReceiver(self.layers)
else:
self.chunk_receiver = None
def _create_canvas(self) -> None:
"""Create the canvas and hook up events."""
self.canvas = VispyCanvas(
keys=None,
vsync=True,
parent=self,
size=self.viewer._canvas_size[::-1],
)
self.canvas.events.draw.connect(self.dims.enable_play)
self.canvas.connect(self.on_mouse_move)
self.canvas.connect(self.on_mouse_press)
self.canvas.connect(self.on_mouse_release)
self.canvas.connect(self._key_map_handler.on_key_press)
self.canvas.connect(self._key_map_handler.on_key_release)
self.canvas.connect(self.on_mouse_wheel)
self.canvas.connect(self.on_draw)
self.canvas.connect(self.on_resize)
self.canvas.bgcolor = get_theme(self.viewer.theme)['canvas']
theme = self.viewer.events.theme
on_theme_change = self.canvas._on_theme_change
theme.connect(on_theme_change)
def disconnect():
# strange EventEmitter has no attribute _callbacks errors sometimes
# maybe some sort of cleanup race condition?
with suppress(AttributeError):
theme.disconnect(on_theme_change)
self.canvas.destroyed.connect(disconnect)
def _add_visuals(self) -> None:
"""Add visuals for axes, scale bar, and welcome text."""
self.axes = VispyAxesVisual(
self.viewer,
parent=self.view.scene,
order=1e6,
)
self.scale_bar = VispyScaleBarVisual(
self.viewer,
parent=self.view,
order=1e6 + 1,
)
self.canvas.events.resize.connect(self.scale_bar._on_position_change)
self.text_overlay = VispyTextVisual(
self.viewer,
parent=self.view,
order=1e6 + 2,
)
self.canvas.events.resize.connect(
self.text_overlay._on_position_change
)
def _create_performance_dock_widget(self):
"""Create the dock widget that shows performance metrics."""
if perf.USE_PERFMON:
return QtViewerDockWidget(
self,
QtPerformance(),
name=trans._('performance'),
area='bottom',
shortcut='Ctrl+Shift+P',
)
return None
@property
def console(self):
"""QtConsole: iPython console terminal integrated into the napari GUI."""
if self._console is None:
try:
from napari_console import QtConsole
import napari
self.console = QtConsole(self.viewer)
self.console.push({'napari': napari})
except ImportError:
warnings.warn(
trans._(
'napari-console not found. It can be installed with'
' "pip install napari_console"'
)
)
self._console = None
return self._console
@console.setter
def console(self, console):
self._console = console
if console is not None:
self.dockConsole.setWidget(console)
def _constrain_width(self, event):
"""Allow the layer controls to be wider, only if floated.
Parameters
----------
event : napari.utils.event.Event
The napari event that triggered this method.
"""
if self.dockLayerControls.isFloating():
self.controls.setMaximumWidth(700)
else:
self.controls.setMaximumWidth(220)
def _on_active_change(self, event=None):
"""When active layer changes change keymap handler.
Parameters
----------
event : napari.utils.event.Event
The napari event that triggered this method.
"""
active_layer = self.viewer.layers.selection.active
if active_layer in self._key_map_handler.keymap_providers:
self._key_map_handler.keymap_providers.remove(active_layer)
if active_layer is not None:
self._key_map_handler.keymap_providers.insert(0, active_layer)
# If a QtAboutKeyBindings exists, update its text.
if self._key_bindings_dialog is not None:
self._key_bindings_dialog.update_active_layer()
def _on_add_layer_change(self, event):
"""When a layer is added, set its parent and order.
Parameters
----------
event : napari.utils.event.Event
The napari event that triggered this method.
"""
layer = event.value
self._add_layer(layer)
def _add_layer(self, layer):
"""When a layer is added, set its parent and order.
Parameters
----------
layer : napari.layers.Layer
Layer to be added.
"""
vispy_layer = create_vispy_visual(layer)
# QtPoll is experimental.
if self._qt_poll is not None:
# QtPoll will call VipyBaseImage._on_poll() when the camera
# moves or the timer goes off.
self._qt_poll.events.poll.connect(vispy_layer._on_poll)
# In the other direction, some visuals need to tell QtPoll to
# start polling. When they receive new data they need to be
# polled to load it, even if the camera is not moving.
if vispy_layer.events is not None:
vispy_layer.events.loaded.connect(self._qt_poll.wake_up)
vispy_layer.node.parent = self.view.scene
vispy_layer.order = len(self.viewer.layers) - 1
self.layer_to_visual[layer] = vispy_layer
def _remove_layer(self, event):
"""When a layer is removed, remove its parent.
Parameters
----------
event : napari.utils.event.Event
The napari event that triggered this method.
"""
layer = event.value
vispy_layer = self.layer_to_visual[layer]
vispy_layer.close()
del vispy_layer
self._reorder_layers(None)
def _reorder_layers(self, event):
"""When the list is reordered, propagate changes to draw order.
Parameters
----------
event : napari.utils.event.Event
The napari event that triggered this method.
"""
for i, layer in enumerate(self.viewer.layers):
vispy_layer = self.layer_to_visual[layer]
vispy_layer.order = i
self.canvas._draw_order.clear()
self.canvas.update()
def _save_layers_dialog(self, selected=False):
"""Save layers (all or selected) to disk, using ``LayerList.save()``.
Parameters
----------
selected : bool
If True, only layers that are selected in the viewer will be saved.
By default, all layers are saved.
"""
msg = ''
if not len(self.viewer.layers):
msg = trans._("There are no layers in the viewer to save")
elif selected and not len(self.viewer.layers.selection):
msg = trans._(
'Please select one or more layers to save,'
'\nor use "Save all layers..."'
)
if msg:
raise OSError(trans._("Nothing to save"))
# prepare list of extensions for drop down menu.
if selected and len(self.viewer.layers.selection) == 1:
selected_layer = list(self.viewer.layers.selection)[0]
# single selected layer.
if selected_layer._type_string == 'image':
ext = imsave_extensions()
ext_list = []
for val in ext:
ext_list.append("*" + val)
ext_str = ';;'.join(ext_list)
ext_str = trans._(
"All Files (*);; Image file types:;;{ext_str}",
ext_str=ext_str,
)
elif selected_layer._type_string == 'points':
ext_str = trans._("All Files (*);; *.csv;;")
else:
# layer other than image or points
ext_str = trans._("All Files (*);;")
else:
# multiple layers.
ext_str = trans._("All Files (*);;")
msg = trans._("selected") if selected else trans._("all")
dlg = QFileDialog()
hist = get_save_history()
dlg.setHistory(hist)
filename, _ = dlg.getSaveFileName(
parent=self,
caption=trans._('Save {msg} layers', msg=msg),
directory=hist[0], # home dir by default,
filter=ext_str,
)
if filename:
with warnings.catch_warnings(record=True) as wa:
saved = self.viewer.layers.save(filename, selected=selected)
error_messages = "\n".join(
[str(x.message.args[0]) for x in wa]
)
if not saved:
raise OSError(
trans._(
"File {filename} save failed.\n{error_messages}",
deferred=True,
filename=filename,
error_messages=error_messages,
)
)
else:
update_save_history(saved[0])
def _update_welcome_screen(self, event=None):
"""Update welcome screen display based on layer count.
Parameters
----------
event : napari.utils.event.Event
The napari event that triggered this method.
"""
if self._show_welcome_screen:
self._canvas_overlay.set_welcome_visible(not self.viewer.layers)
def screenshot(self, path=None):
"""Take currently displayed screen and convert to an image array.
Parameters
----------
path : str
Filename for saving screenshot image.
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.canvas.native.grabFramebuffer())
if path is not None:
imsave(path, img) # scikit-image imsave method
return img
def _screenshot_dialog(self):
"""Save screenshot of current display, default .png"""
hist = get_save_history()
dial = ScreenshotDialog(self.screenshot, self, hist[0], hist)
if dial.exec_():
update_save_history(dial.selectedFiles()[0])
def _open_files_dialog(self):
"""Add files from the menubar."""
dlg = QFileDialog()
hist = get_open_history()
dlg.setHistory(hist)
filenames, _ = dlg.getOpenFileNames(
parent=self,
caption=trans._('Select file(s)...'),
directory=hist[0],
)
if (filenames != []) and (filenames is not None):
self.viewer.open(filenames)
update_open_history(filenames[0])
def _open_files_dialog_as_stack_dialog(self):
"""Add files as a stack, from the menubar."""
dlg = QFileDialog()
hist = get_open_history()
dlg.setHistory(hist)
filenames, _ = dlg.getOpenFileNames(
parent=self,
caption=trans._('Select files...'),
directory=hist[0], # home dir by default
)
if (filenames != []) and (filenames is not None):
self.viewer.open(filenames, stack=True)
update_open_history(filenames[0])
def _open_folder_dialog(self):
"""Add a folder of files from the menubar."""
dlg = QFileDialog()
hist = get_open_history()
dlg.setHistory(hist)
folder = dlg.getExistingDirectory(
parent=self,
caption=trans._('Select folder...'),
directory=hist[0], # home dir by default
)
if folder not in {'', None}:
self.viewer.open([folder])
update_open_history(folder)
def _toggle_chunk_outlines(self):
"""Toggle whether we are drawing outlines around the chunks."""
from ..layers.image.experimental.octree_image import _OctreeImageBase
for layer in self.viewer.layers:
if isinstance(layer, _OctreeImageBase):
layer.display.show_grid = not layer.display.show_grid
def _on_interactive(self, event):
"""Link interactive attributes of view and viewer.
Parameters
----------
event : napari.utils.event.Event
The napari event that triggered this method.
"""
self.view.interactive = self.viewer.camera.interactive
def _on_cursor(self, event):
"""Set the appearance of the mouse cursor.
Parameters
----------
event : napari.utils.event.Event
The napari event that triggered this method.
"""
cursor = self.viewer.cursor.style
# Scale size by zoom if needed
if self.viewer.cursor.scaled:
size = self.viewer.cursor.size * self.viewer.camera.zoom
else:
size = self.viewer.cursor.size
if cursor == 'square':
# make sure the square fits within the current canvas
if size < 8 or size > (
min(*self.viewer.window.qt_viewer.canvas.size) - 4
):
q_cursor = self._cursors['cross']
else:
q_cursor = QCursor(square_pixmap(size))
elif cursor == 'circle':
q_cursor = QCursor(circle_pixmap(size))
else:
q_cursor = self._cursors[cursor]
self.canvas.native.setCursor(q_cursor)
def toggle_console_visibility(self, event=None):
"""Toggle console visible and not visible.
Imports the console the first time it is requested.
"""
# force instantiation of console if not already instantiated
_ = self.console
viz = not self.dockConsole.isVisible()
# modulate visibility at the dock widget level as console is dockable
self.dockConsole.setVisible(viz)
if self.dockConsole.isFloating():
self.dockConsole.setFloating(True)
if viz:
self.dockConsole.raise_()
self.viewerButtons.consoleButton.setProperty(
'expanded', self.dockConsole.isVisible()
)
self.viewerButtons.consoleButton.style().unpolish(
self.viewerButtons.consoleButton
)
self.viewerButtons.consoleButton.style().polish(
self.viewerButtons.consoleButton
)
def show_key_bindings_dialog(self, event=None):
if self._key_bindings_dialog is None:
self._key_bindings_dialog = QtAboutKeyBindings(
self.viewer, self._key_map_handler, parent=self
)
# make sure the dialog is shown
self._key_bindings_dialog.show()
# make sure the the dialog gets focus
self._key_bindings_dialog.raise_() # for macOS
self._key_bindings_dialog.activateWindow() # for Windows
def _map_canvas2world(self, position):
"""Map position from canvas pixels into world coordinates.
Parameters
----------
position : 2-tuple
Position in canvas (x, y).
Returns
-------
coords : tuple
Position in world coordinates, matches the total dimensionality
of the viewer.
"""
nd = self.viewer.dims.ndisplay
transform = self.view.camera.transform.inverse
mapped_position = transform.map(list(position))[:nd]
position_world_slice = mapped_position[::-1]
position_world = list(self.viewer.dims.point)
for i, d in enumerate(self.viewer.dims.displayed):
position_world[d] = position_world_slice[i]
return tuple(position_world)
@property
def _canvas_corners_in_world(self):
"""Location of the corners of canvas in world coordinates.
Returns
-------
corners : 2-tuple
Coordinates of top left and bottom right canvas pixel in the world.
"""
# Find corners of canvas in world coordinates
top_left = self._map_canvas2world([0, 0])
bottom_right = self._map_canvas2world(self.canvas.size)
return np.array([top_left, bottom_right])
def on_resize(self, event):
"""Called whenever canvas is resized.
event : vispy.util.event.Event
The vispy event that triggered this method.
"""
self.viewer._canvas_size = tuple(self.canvas.size[::-1])
def _process_mouse_event(self, mouse_callbacks, event):
"""Called whenever mouse pressed in canvas.
Parameters
----------
mouse_callbacks : function
Mouse callbacks function.
event : vispy.event.Event
The vispy event that triggered this method.
"""
if event.pos is None:
return
# Update the cursor position
self.viewer.cursor.position = self._map_canvas2world(list(event.pos))
# Add the cursor position to the event
event.position = self.viewer.cursor.position
# Put a read only wrapper on the event
event = ReadOnlyWrapper(event)
mouse_callbacks(self.viewer, event)
layer = self.viewer.layers.selection.active
if layer is not None:
mouse_callbacks(layer, event)
def on_mouse_wheel(self, event):
"""Called whenever mouse wheel activated in canvas.
Parameters
----------
event : vispy.event.Event
The vispy event that triggered this method.
"""
self._process_mouse_event(mouse_wheel_callbacks, event)
def on_mouse_press(self, event):
"""Called whenever mouse pressed in canvas.
Parameters
----------
event : vispy.event.Event
The vispy event that triggered this method.
"""
self._process_mouse_event(mouse_press_callbacks, event)
def on_mouse_move(self, event):
"""Called whenever mouse moves over canvas.
Parameters
----------
event : vispy.event.Event
The vispy event that triggered this method.
"""
self._process_mouse_event(mouse_move_callbacks, event)
def on_mouse_release(self, event):
"""Called whenever mouse released in canvas.
Parameters
----------
event : vispy.event.Event
The vispy event that triggered this method.
"""
self._process_mouse_event(mouse_release_callbacks, event)
def on_draw(self, event):
"""Called whenever the canvas is drawn.
This is triggered from vispy whenever new data is sent to the canvas or
the camera is moved and is connected in the `QtViewer`.
"""
for layer in self.viewer.layers:
if layer.ndim <= self.viewer.dims.ndim:
layer._update_draw(
scale_factor=1 / self.viewer.camera.zoom,
corner_pixels=self._canvas_corners_in_world[
:, -layer.ndim :
],
shape_threshold=self.canvas.size,
)
def set_welcome_visible(self, visible):
"""Show welcome screen widget."""
self._show_welcome_screen = visible
self._canvas_overlay.set_welcome_visible(visible)
def keyPressEvent(self, event):
"""Called whenever a key is pressed.
Parameters
----------
event : qtpy.QtCore.QEvent
Event from the Qt context.
"""
self.canvas._backend._keyEvent(self.canvas.events.key_press, event)
event.accept()
def keyReleaseEvent(self, event):
"""Called whenever a key is released.
Parameters
----------
event : qtpy.QtCore.QEvent
Event from the Qt context.
"""
self.canvas._backend._keyEvent(self.canvas.events.key_release, event)
event.accept()
def dragEnterEvent(self, event):
"""Ignore event if not dragging & dropping a file or URL to open.
Using event.ignore() here allows the event to pass through the
parent widget to its child widget, otherwise the parent widget
would catch the event and not pass it on to the child widget.
Parameters
----------
event : qtpy.QtCore.QEvent
Event from the Qt context.
"""
if event.mimeData().hasUrls():
event.accept()
else:
event.ignore()
def dropEvent(self, event):
"""Add local files and web URLS with drag and drop.
Parameters
----------
event : qtpy.QtCore.QEvent
Event from the Qt context.
"""
shift_down = QGuiApplication.keyboardModifiers() & Qt.ShiftModifier
filenames = []
for url in event.mimeData().urls():
if url.isLocalFile():
filenames.append(url.toLocalFile())
else:
filenames.append(url.toString())
self.viewer.open(filenames, stack=bool(shift_down))
def closeEvent(self, event):
"""Cleanup and close.
Parameters
----------
event : qtpy.QtCore.QEvent
Event from the Qt context.
"""
self.layers.close()
# if the viewer.QtDims object is playing an axis, we need to terminate
# the AnimationThread before close, otherwise it will cauyse a segFault
# or Abort trap. (calling stop() when no animation is occurring is also
# not a problem)
self.dims.stop()
self.canvas.native.deleteLater()
if self._console is not None:
self.console.close()
self.dockConsole.deleteLater()
event.accept()