/usr/lib/python3/dist-packages/ginga/rv/Channel.py is in python3-ginga 2.6.1-2.
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# Channel.py -- Channel class for the Ginga reference viewer.
#
# This is open-source software licensed under a BSD license.
# Please see the file LICENSE.txt for details.
#
import threading
import time
from datetime import datetime
from ginga.misc import Bunch, Datasrc, Callback, Future
class ChannelError(Exception):
pass
class Channel(Callback.Callbacks):
"""Class to manage a channel.
Parameters
----------
name : str
Name of the channel.
fv : `~ginga.rv.Control.GingaShell`
The reference viewer shell.
settings : `~ginga.misc.Settings.SettingGroup`
Channel settings.
datasrc : `~ginga.misc.Datasrc.Datasrc`
Data cache.
"""
def __init__(self, name, fv, settings, datasrc=None):
super(Channel, self).__init__()
self.logger = fv.logger
self.fv = fv
self.settings = settings
self.logger = fv.logger
self.lock = threading.RLock()
# CHANNEL ATTRIBUTES
self.name = name
self.widget = None
self.container = None
self.workspace = None
self.opmon = None
# this is the image viewer we are connected to
self.fitsimage = None
# this is the currently active viewer
self.viewer = None
self.viewers = []
self.viewer_dict = {}
if datasrc is None:
num_images = self.settings.get('numImages', 1)
datasrc = Datasrc.Datasrc(num_images)
self.datasrc = datasrc
self.cursor = -1
self.history = []
self.image_index = {}
# external entities can attach stuff via this attribute
self.extdata = Bunch.Bunch()
self._configure_sort()
self.settings.getSetting('sort_order').add_callback(
'set', self._sort_changed_ext_cb)
def connect_viewer(self, viewer):
if not viewer in self.viewers:
self.viewers.append(viewer)
self.viewer_dict[viewer.vname] = viewer
def move_image_to(self, imname, channel):
if self == channel:
return
self.copy_image_to(imname, channel)
self.remove_image(imname)
def copy_image_to(self, imname, channel, silent=False):
if self == channel:
return
try:
# copy image to other channel's datasrc if still
# in memory
image = self.datasrc[imname]
except KeyError:
# transfer image info
info = self.image_index[imname]
channel._add_info(info)
return
#channel.datasrc[imname] = image
channel.add_image(image, silent=silent)
def remove_image(self, imname):
if self.datasrc.has_key(imname):
self.datasrc.remove(imname)
info = self.remove_history(imname)
return info
def get_image_names(self):
return [ info.name for info in self.history ]
def get_loaded_image(self, imname):
"""Get an image from memory.
Parameters
----------
imname : str
Key, usually image name and extension.
Returns
-------
image
Image object.
Raises
------
KeyError
Image is not in memory.
"""
image = self.datasrc[imname]
return image
def add_image(self, image, silent=False, bulk_add=False):
imname = image.get('name', None)
assert imname is not None, \
ValueError("image has no name")
self.logger.debug("Adding image '%s' in channel %s" % (
imname, self.name))
self.datasrc[imname] = image
idx = image.get('idx', None)
path = image.get('path', None)
image_loader = image.get('image_loader', None)
image_future = image.get('image_future', None)
info = self.add_history(imname, path,
image_loader=image_loader,
image_future=image_future,
idx=idx)
# we'll get notified if an image changes and can update
# metadata and make a chained callback
image.add_callback('modified', self._image_modified_cb)
if not silent:
if not bulk_add:
self._add_image_update(image, info)
return
# By using gui_do() here, more images may be bulk added
# before the _add_image_update executes--it will then
# only update the gui for the latest image, which saves
# work
self.fv.gui_do(self._add_image_update, image, info)
def add_image_info(self, info):
image_loader = info.get('image_loader', self.fv.load_image)
# create an image_future if one does not exist
image_future = info.get('image_future', None)
if (image_future is None) and (info.path is not None):
image_future = Future.Future()
image_future.freeze(image_loader, info.path)
info = self.add_history(info.name, info.path,
image_loader=image_loader,
image_future=image_future)
self.fv.make_async_gui_callback('add-image-info', self, info)
def get_image_info(self, imname):
return self.image_index[imname]
def _add_image_update(self, image, info):
self.fv.make_async_gui_callback('add-image', self.name, image, info)
current = self.datasrc.youngest()
curname = current.get('name')
self.logger.debug("image=%s youngest=%s" % (image.get('name'), curname))
if current != image:
return
# switch to current image?
if self.settings['switchnew']:
self.logger.debug("switching to new image '%s'" % (curname))
self.switch_image(image)
if self.settings['raisenew']:
channel = self.fv.get_current_channel()
if channel != self:
self.fv.change_channel(self.name)
def _image_modified_cb(self, image):
imname = image.get('name')
info = self.image_index[imname]
info.time_modified = datetime.utcnow()
self.logger.debug("image modified; making chained callback")
self.fv.make_async_gui_callback('add-image-info', self, info)
def refresh_cursor_image(self):
info = self.history[self.cursor]
if self.datasrc.has_key(info.name):
# image still in memory
image = self.datasrc[info.name]
self.switch_image(image)
else:
self.switch_name(info.name)
def prev_image(self, loop=True):
with self.lock:
self.logger.debug("Previous image")
if self.cursor <= 0:
n = len(self.history) - 1
if (not loop) or (n < 0):
self.logger.error("No previous image!")
return True
self.cursor = n
else:
self.cursor -= 1
self.refresh_cursor_image()
return True
def next_image(self, loop=True):
with self.lock:
self.logger.debug("Next image")
n = len(self.history) - 1
if self.cursor >= n:
if (not loop) or (n < 0):
self.logger.error("No next image!")
return True
self.cursor = 0
else:
self.cursor += 1
self.refresh_cursor_image()
return True
def _add_info(self, info):
if not info in self.image_index:
self.history.append(info)
self.image_index[info.name] = info
if self.hist_sort is not None:
self.history.sort(key=self.hist_sort)
def add_history(self, imname, path, idx=None,
image_loader=None, image_future=None):
if not (imname in self.image_index):
if image_loader is None:
image_loader = self.fv.load_image
# create an image_future if one does not exist
if (image_future is None) and (path is not None):
image_future = Future.Future()
image_future.freeze(image_loader, path)
info = Bunch.Bunch(name=imname, path=path,
idx=idx,
image_loader=image_loader,
image_future=image_future,
time_added=time.time(),
time_modified=None)
self._add_info(info)
else:
# already in history
info = self.image_index[imname]
return info
def remove_history(self, imname):
if imname in self.image_index:
info = self.image_index[imname]
del self.image_index[imname]
self.history.remove(info)
return info
return None
def get_current_image(self):
return self.viewer.get_image()
def view_object(self, dataobj):
# find available viewers that can view this kind of object
vnames = self.fv.get_viewer_names(dataobj)
if len(vnames) == 0:
raise ValueError("I don't know how to view objects of type '%s'" % (
str(type(dataobj))))
self.logger.debug("available viewers are: %s" % (str(vnames)))
# for now, pick first available viewer that can view this type
vname = vnames[0]
# if we don't have this viewer type then install one in the channel
if not vname in self.viewer_dict:
self.fv.make_viewer(vname, self)
self.viewer = self.viewer_dict[vname]
# find this viewer and raise it
idx = self.viewers.index(self.viewer)
self.widget.set_index(idx)
# and load the data
self.viewer.set_image(dataobj)
def switch_image(self, image):
with self.lock:
curimage = self.get_current_image()
if curimage != image:
self.logger.debug("updating viewer...")
self.view_object(image)
# update cursor to match image
imname = image.get('name')
if imname in self.image_index:
info = self.image_index[imname]
if info in self.history:
self.cursor = self.history.index(info)
self.fv.channel_image_updated(self, image)
# Check for preloading any images into memory
preload = self.settings.get('preload_images', False)
if not preload:
return
# queue next and previous files for preloading
index = self.cursor
if index < len(self.history)-1:
info = self.history[index+1]
if info.path is not None:
self.fv.add_preload(self.name, info)
if index > 0:
info = self.history[index-1]
if info.path is not None:
self.fv.add_preload(self.name, info)
else:
self.logger.debug("Apparently no need to set image.")
def switch_name(self, imname):
if self.datasrc.has_key(imname):
# Image is still in the heap
image = self.datasrc[imname]
self.switch_image(image)
return
if not (imname in self.image_index):
errmsg = "No image by the name '%s' found" % (imname)
self.logger.error("Can't switch to image '%s': %s" % (
imname, errmsg))
raise ChannelError(errmsg)
# Do we have a way to reconstruct this image from a future?
info = self.image_index[imname]
if info.image_future is not None:
self.logger.info("Image '%s' is no longer in memory; attempting "
"reloader" % (imname))
# TODO: recode this--it's a bit messy
def _switch(image):
# this will be executed in the gui thread
self.add_image(image, silent=True)
self.switch_image(image)
# reset modified timestamp
info.time_modified = None
self.fv.make_async_gui_callback('add-image-info', self, info)
def _load_n_switch(imname, path, image_future):
# this will be executed in a non-gui thread
# reconstitute the image
image = self.fv.error_wrap(image_future.thaw)
if isinstance(image, Exception):
errmsg = "Error reconstituting image: %s" % (str(image))
self.logger.error(errmsg)
raise image
# perpetuate the image_future
image.set(image_future=image_future, name=imname, path=path)
self.fv.gui_do(_switch, image)
self.fv.nongui_do(_load_n_switch, imname, info.path,
info.image_future)
elif info.path is not None:
# Do we have a path? We can try to reload it
self.logger.debug("Image '%s' is no longer in memory; attempting "
"to load from %s" % (imname, info.path))
#self.fv.load_file(path, chname=chname)
self.fv.nongui_do(self.load_file, info.path, chname=self.name)
else:
raise ChannelError("No way to recreate image '%s'" % (imname))
def _configure_sort(self):
self.hist_sort = lambda info: info.time_added
# set sorting function
sort_order = self.settings.get('sort_order', 'loadtime')
if sort_order == 'alpha':
# sort history alphabetically
self.hist_sort = lambda info: info.name
def _sort_changed_ext_cb(self, setting, value):
self._configure_sort()
self.history.sort(key=self.hist_sort)
# END
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