Mapper.add_mapping() - Code Metrics - Inspection of "Merge branch 'master' into pulsed_with_queued_conn..." - Ulm-IQO/qudi - Measure and Improve Code Quality continuously with Scrutinizer

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Mapper.add_mapping() F

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148

Duplication

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cc	17
dl	0
loc	148
rs	2
c	7
b	0
f	4

How to fix Long Method Complexity

# -*- coding: utf-8 -*-
"""
This file contains the Qudi mapper module.

Qudi is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

Qudi is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with Qudi. If not, see <http://www.gnu.org/licenses/>.

Copyright (c) the Qudi Developers. See the COPYRIGHT.txt file at the
top-level directory of this distribution and at <https://github.com/Ulm-IQO/qudi/>
"""


from qtpy.QtCore import QCoreApplication
from qtpy.QtCore import QObject
from qtpy.QtCore import QThread
from qtpy.QtCore import QTimer
from qtpy.QtWidgets import QAbstractButton
from qtpy.QtWidgets import QAbstractSlider
from qtpy.QtWidgets import QComboBox
from qtpy.QtWidgets import QDoubleSpinBox
from qtpy.QtWidgets import QLineEdit
from qtpy.QtWidgets import QPlainTextEdit
from qtpy.QtWidgets import QSpinBox

import functools

SUBMIT_POLICY_AUTO = 0
"""automatically submit changes"""
SUBMIT_POLICY_MANUAL = 1
"""wait with submitting changes until submit() is called"""


class Converter():
    """
    Class for converting data between display and storage (i.e. widget and
    model).
    """
    def widget_to_model(self, data):
        """
        Converts data in the format given by the widget and converts it
        to the model data format.

        Parameter:
        ==========
        data: object data to be converted

        Returns:
        ========
        out: object converted data
        """
        return data

    def model_to_widget(self, data):
        """
        Converts data in the format given by the model and converts it
        to the widget data format.

        Parameter:
        ==========
        data: object data to be converted

        Returns:
        ========
        out: object converted data
        """
        return data


class Mapper():
    """
    The Mapper connects a Qt widget for displaying and editing certain data
    types with a model property or setter and getter functions. The model can
    be e.g. a logic or a hardware module.

    Usage Example:
    ==============

    We assume to have a logic module which is connected to our GUI via a
    connector and we can access it by the `logic_module` variable. We
    further assume that this logic module has a string property called
    `some_value` and a signal `some_value_changed` which is emitted when the
    property is changed programmatically.
    In the GUI module we have defined a QLineEdit, e.g. by
    ```
    lineedit = QLineEdit()
    ```
    In the on_activate method of the GUI module, we define the following
    mapping between the line edit and the logic property:
    ```
    def on_activate(self, e):
        self.mapper = Mapper()
        self.mapper.add_mapping(self.lineedit, self.logic_module,
                'some_value', 'some_value_changed')
    ```
    Now, if the user changes the string in the lineedit, the property of the
    logic module is changed. If the logic module's property is changed
    programmatically, the change is automatically displayed in the GUI.

    If the GUI module is deactivated we should delete all mappings:
    ```
    def on_deactivate(self, e):
        self.mapper.clear_mapping()
    ```
    """

    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        self._submit_policy = SUBMIT_POLICY_AUTO
        self._mappings = {}

    def _get_property_from_widget(self, widget):
        """
        Returns the property name we determined from the widget's type.
        """
        if isinstance(widget, QAbstractButton):
            return 'checked'
        elif isinstance(widget, QComboBox):
            return 'currentIndex'
        elif isinstance(widget, QLineEdit):
            return 'text'
        elif (isinstance(widget, (QSpinBox, QDoubleSpinBox, QAbstractSlider)):
            return 'value'
        elif isinstance(widget, QPlainTextEdit):
            return 'plainText'
        else:
            raise Exception('Property of widget {0} could not be '
                            'determined.'.format(repr(widget)))

    def add_mapping(self,
                    widget,
                    model,
                    model_getter,
                    model_property_notifier=None,
                    model_setter=None,
                    widget_property_name='',
                    widget_property_notifier=None,
                    converter=None):
        """
        Adds a mapping.

        Parameters
        ==========
        widget QtWidget A widget displaying some data. You want to map this
                        widget to model data
        model  object   Instance of a class holding model data (e.g. a logic
                        or hardware module)
        model_getter property/callable either a property holding the data to
                                       be displayed in widget or a getter
                                       method to retrieve data from the model
                                       was changed.
        model_property_notifier Signal A signal that is fired when the data
                                       was changed.
                                       Default: None. If None then data
                                       changes are not monitored and the
                                       widget is not updated.
        model_setter callable A setter method which is called to set data to
                              the model.
                              If model_getter is a property the setter can be
                              determined from this property and model_setter
                              is ignored if it is None. If it is not None
                              always this callable is used.
                              Default: None
        widget_property_name str The name of the pyqtProperty of the widget
                                 used to map the data.
                                 Default: ''
                                 If it is an empty string the relevant
                                 property is guessed from the widget's type.
        widget_property_notifier Signal Notifier signal which is fired by the
                                        widget when the data changed. If None
                                        this is determined directly from the
                                        property.
                                        Example usage:
                                        QLineEdit().editingFinished
                                        Default: None
        converter Converter converter instance for converting data between
                            widget display and model.
                            Default: None

        """
        # guess widget property if not specified
        if widget_property_name == '':
            widget_property_name = self._get_property_from_widget(widget)

        # define key of mapping
        key = (widget, widget_property_name)

        # check if already exists
        if key in self._mappings:
            raise Exception('Property {0} of widget {1} already mapped.'
                            ''.format(widget_property_name, repr(widget)))

        # check if widget property is available
        index = widget.metaObject().indexOfProperty(widget_property_name)
        if index == -1:
            raise Exception('Property ''{0}'' of widget ''{1}'' not '
                            'available.'.format(widget_property_name,
                                                widget.__class__.__name__))

        meta_property = widget.metaObject().property(index)

        # widget property notifier
        if widget_property_notifier is None:
            # check that widget property as a notify signal
            if not meta_property.hasNotifySignal():
                raise Exception('Property ''{0}'' of widget ''{1}'' has '
                                'no notify signal.'.format(
                                    widget_property_name,
                                    widget.__class__.__name__))
            widget_property_notifier = getattr(
                widget,
                meta_property.notifySignal().name().data().decode('utf8'))

        # check that widget property is readable
        if not meta_property.isReadable():
            raise Exception('Property ''{0}'' of widget ''{1}'' is not '
                            'readable.'.format(widget_property_name,
                                               widget.__class__.__name__))
        widget_property_getter = meta_property.read
        # check that widget property is writable if requested
        if not meta_property.isWritable():
            raise Exception('Property ''{0}'' of widget ''{1}'' is not '
                            'writable.'.format(widget_property_name,
                                               widget.__class__.__name__))
        widget_property_setter = meta_property.write

        if isinstance(model_getter, str):
            # check if it is a property
            attr = getattr(model.__class__, model_getter, None)
            if attr is None:
                raise Exception('Model has no attribute {0}'.format(
                    model_getter))
            if isinstance(attr, property):
                # retrieve getter from property
                model_property_name = model_getter
                model_getter = functools.partial(attr.fget, model)
                # if no setter was specified, get it from the property
                if model_setter is None:
                    model_setter = functools.partial(attr.fset, model)
                    if model_getter is None:
                        raise Exception('Attribute {0} of model is readonly.'
                                        ''.format(model_property_name))
        if isinstance(model_setter, str):
            model_setter_name = model_setter
            model_setter = getattr(model, model_setter)
            if not callable(model_setter):
                raise Exception('{0} is not callable'.format(
                    model_setter_name))
        if isinstance(model_property_notifier, str):
            model_property_notifier = getattr(model, model_property_notifier)

        # connect to widget property notifier
        widget_property_notifier_slot = functools.partial(
            self._on_widget_property_notification, key)
        widget_property_notifier.connect(widget_property_notifier_slot)

        # if model_notify_signal was specified, connect to it
        model_property_notifier_slot = None
        if model_property_notifier is not None:
            model_property_notifier_slot = functools.partial(
                self._on_model_notification, key)
            model_property_notifier.connect(model_property_notifier_slot)
        # save mapping
        self._mappings[key] = {
            'widget_property_name': widget_property_name,
            'widget_property_getter': widget_property_getter,
            'widget_property_setter': widget_property_setter,
            'widget_property_notifier': widget_property_notifier,
            'widget_property_notifier_slot': widget_property_notifier_slot,
            'widget_property_notifications_disabled': False,
            'model': model,
            'model_property_setter': model_setter,
            'model_property_getter': model_getter,
            'model_property_notifier': model_property_notifier,
            'model_property_notifier_slot': model_property_notifier_slot,
            'model_property_notifications_disabled': False,
            'converter': converter}

    def _on_widget_property_notification(self, key, *args):
        """
        Event handler for widget property change notification. Used with
        functools.partial to get the widget as first parameter.

        Parameters
        ==========
        key: (QtWidget, str) The key consisting of widget and property name,
                             the notification signal was emitted from.
        args*: List list of event parameters
        """
        widget, widget_property_name = key
        if self._mappings[key]['widget_property_notifications_disabled']:
            return
        if self._submit_policy == SUBMIT_POLICY_AUTO:
            self._mappings[key][
                'model_property_notifications_disabled'] = True
            try:
                # get value
                value = self._mappings[key]['widget_property_getter'](
                    widget)
                # convert it if requested
                if self._mappings[key]['converter'] is not None:
                    value = self._mappings[key][
                        'converter'].widget_to_model(value)
                # set it to model
                self._mappings[key]['model_property_setter'](value)
            finally:
                self._mappings[key][
                    'model_property_notifications_disabled'] = False
        else:
            pass

    def _on_model_notification(self, key, *args):
        """
        Event handler for model data change notification. Used with
        functools.partial to get the widget as first parameter.

        Parameters
        ==========
        key: (QtWidget, str) The key consisting of widget and property name
                             the notification signal was emitted from.
        args*: List list of event parameters
        """
        widget, widget_property_name = key
        mapping = self._mappings[key]
        # get value from model
        value = self._mappings[key]['model_property_getter']()

        # are updates disabled?
        if self._mappings[key]['model_property_notifications_disabled']:
            # but check if value has changed first
            # get value from widget
            value_widget = self._mappings[key]['widget_property_getter'](
                widget)
            # convert it if requested
            if self._mappings[key]['converter'] is not None:
                value_widget = self._mappings[key][
                    'converter'].widget_to_model(value_widget)
            # accept changes, stop if nothing has changed
            if (value == value_widget):
                return

        # convert value if requested
        if self._mappings[key]['converter'] is not None:
            value = self._mappings[key]['converter'].model_to_widget(value)

        # update widget
        self._mappings[key][
            'widget_property_notifications_disabled'] = True
        try:
            self._mappings[key]['widget_property_setter'](widget, value)
        finally:
            self._mappings[key][
                'widget_property_notifications_disabled'] = False

    def clear_mapping(self):
        """
        Clears all mappings.
        """
        # convert iterator to list because the _mappings dictionary will
        # change its size during iteration
        for key in list(self._mappings.keys()):
            self.remove_mapping(key)

    def remove_mapping(self, widget, widget_property_name=''):
        """
        Removes the mapping which maps the QtWidget widget to some model data.

        Parameters
        ==========
        widget: QtWidget/(QtWidget, str) widget the mapping is attached to
                                  or a tuple containing the widget and the
                                  widget's property name
        widget_property_name: str name of the property of the widget we are
                                  dealing with. If '' it will be determined
                                  from the widget.
                                  Default: ''
        """
        if isinstance(widget, tuple):
            widget, widget_property_name = widget
        # guess widget property if not specified
        if widget_property_name == '':
            widget_property_name = self._get_property_from_widget(widget)
        # define key
        key = (widget, widget_property_name)
        # check that key has a mapping
        if not key in self._mappings:
            raise Exception('Widget {0} is not mapped.'.format(repr(widget)))
        # disconnect signals
        self._mappings[key]['widget_property_notifier'].disconnect(
            self._mappings[key]['widget_property_notifier_slot'])
        if self._mappings[key]['model_property_notifier'] is not None:
            self._mappings[key]['model_property_notifier'].disconnect(
                self._mappings[key]['model_property_notifier_slot'])
        # remove from dictionary
        del self._mappings[key]

    @property
    def submit_policy(self):
        """
        Returns the submit policy.
        """
        return self._submit_policy

    @submit_policy.setter
    def submit_policy(self, policy):
        """
        Sets submit policy.

        Submit policy can either be SUBMIT_POLICY_AUTO or
        SUBMIT_POLICY_MANUAL. If the submit policy is auto then changes in
        the widgets are automatically submitted to the model. If manual
        call submit() to submit it.

        Parameters
        ==========
        policy: enum submit policy
        """
        if policy not in [SUBMIT_POLICY_AUTO, SUBMIT_POLICY_MANUAL]:
            raise Exception('Unknown submit policy ''{0}'''.format(policy))
        self._submit_policy = policy

    def submit(self):
        """
        Submits the current values stored in the widgets to the models.
        """
        # make sure it is called from main thread
        if (not QThread.currentThread() == QCoreApplication.instance(
        ).thread()):
            QTimer.singleShot(0, self.submit)
            return

        submit_policy = self._submit_policy
        self.submit_policy = SUBMIT_POLICY_AUTO
        try:
            for key in self._mappings:
                self._on_widget_property_notification(key)
        finally:
            self.submit_policy = submit_policy

    def revert(self):
        """
        Takes the data stored in the models and displays them in the widgets.
        """
        # make sure it is called from main thread
        if (not QThread.currentThread() == QCoreApplication.instance(
        ).thread()):
            QTimer.singleShot(0, self.revert)
            return

        for key in self._mappings:
            self._on_model_notification(key)


1			# -- coding: utf-8 --
2			"""
3			This file contains the Qudi mapper module.
4
5			Qudi is free software: you can redistribute it and/or modify
6			it under the terms of the GNU General Public License as published by
7			the Free Software Foundation, either version 3 of the License, or
8			(at your option) any later version.
9
10			Qudi is distributed in the hope that it will be useful,
11			but WITHOUT ANY WARRANTY; without even the implied warranty of
12			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13			GNU General Public License for more details.
14
15			You should have received a copy of the GNU General Public License
16			along with Qudi. If not, see <http://www.gnu.org/licenses/>.
17
18			Copyright (c) the Qudi Developers. See the COPYRIGHT.txt file at the
19			top-level directory of this distribution and at <https://github.com/Ulm-IQO/qudi/>
20			"""
21
22
23			from qtpy.QtCore import QCoreApplication
24			from qtpy.QtCore import QObject
25			from qtpy.QtCore import QThread
26			from qtpy.QtCore import QTimer
27			from qtpy.QtWidgets import QAbstractButton
28			from qtpy.QtWidgets import QAbstractSlider
29			from qtpy.QtWidgets import QComboBox
30			from qtpy.QtWidgets import QDoubleSpinBox
31			from qtpy.QtWidgets import QLineEdit
32			from qtpy.QtWidgets import QPlainTextEdit
33			from qtpy.QtWidgets import QSpinBox
34
35			import functools
36
37			SUBMIT_POLICY_AUTO = 0
38			"""automatically submit changes"""
39			SUBMIT_POLICY_MANUAL = 1
40			"""wait with submitting changes until submit() is called"""
41
42
43			class Converter():
44			"""
45			Class for converting data between display and storage (i.e. widget and
46			model).
47			"""
48			def widget_to_model(self, data):
49			"""
50			Converts data in the format given by the widget and converts it
51			to the model data format.
52
53			Parameter:
54			==========
55			data: object data to be converted
56
57			Returns:
58			========
59			out: object converted data
60			"""
61			return data
62
63			def model_to_widget(self, data):
64			"""
65			Converts data in the format given by the model and converts it
66			to the widget data format.
67
68			Parameter:
69			==========
70			data: object data to be converted
71
72			Returns:
73			========
74			out: object converted data
75			"""
76			return data
77
78
79			class Mapper():
80			"""
81			The Mapper connects a Qt widget for displaying and editing certain data
82			types with a model property or setter and getter functions. The model can
83			be e.g. a logic or a hardware module.
84
85			Usage Example:
86			==============
87
88			We assume to have a logic module which is connected to our GUI via a
89			connector and we can access it by the `logic_module` variable. We
90			further assume that this logic module has a string property called
91			`some_value` and a signal `some_value_changed` which is emitted when the
92			property is changed programmatically.
93			In the GUI module we have defined a QLineEdit, e.g. by
94			```
95			lineedit = QLineEdit()
96			```
97			In the on_activate method of the GUI module, we define the following
98			mapping between the line edit and the logic property:
99			```
100			def on_activate(self, e):
101			self.mapper = Mapper()
102			self.mapper.add_mapping(self.lineedit, self.logic_module,
103			'some_value', 'some_value_changed')
104			```
105			Now, if the user changes the string in the lineedit, the property of the
106			logic module is changed. If the logic module's property is changed
107			programmatically, the change is automatically displayed in the GUI.
108
109			If the GUI module is deactivated we should delete all mappings:
110			```
111			def on_deactivate(self, e):
112			self.mapper.clear_mapping()
113			```
114			"""
115
116			def __init__(self, **kwargs):
117			super().__init__(**kwargs)
118			self._submit_policy = SUBMIT_POLICY_AUTO
119			self._mappings = {}
120
121			def _get_property_from_widget(self, widget):
122			"""
123			Returns the property name we determined from the widget's type.
124			"""
125			if isinstance(widget, QAbstractButton):
126			return 'checked'
127			elif isinstance(widget, QComboBox):
128			return 'currentIndex'
129			elif isinstance(widget, QLineEdit):
130			return 'text'
131			elif (isinstance(widget, (QSpinBox, QDoubleSpinBox, QAbstractSlider)):
132			return 'value'
133			elif isinstance(widget, QPlainTextEdit):
134			return 'plainText'
135			else:
136			raise Exception('Property of widget {0} could not be '
137			'determined.'.format(repr(widget)))
138
139			def add_mapping(self,
140			widget,
141			model,
142			model_getter,
143			model_property_notifier=None,
144			model_setter=None,
145			widget_property_name='',
146			widget_property_notifier=None,
147			converter=None):
148			"""
149			Adds a mapping.
150
151			Parameters
152			==========
153			widget QtWidget A widget displaying some data. You want to map this
154			widget to model data
155			model object Instance of a class holding model data (e.g. a logic
156			or hardware module)
157			model_getter property/callable either a property holding the data to
158			be displayed in widget or a getter
159			method to retrieve data from the model
160			was changed.
161			model_property_notifier Signal A signal that is fired when the data
162			was changed.
163			Default: None. If None then data
164			changes are not monitored and the
165			widget is not updated.
166			model_setter callable A setter method which is called to set data to
167			the model.
168			If model_getter is a property the setter can be
169			determined from this property and model_setter
170			is ignored if it is None. If it is not None
171			always this callable is used.
172			Default: None
173			widget_property_name str The name of the pyqtProperty of the widget
174			used to map the data.
175			Default: ''
176			If it is an empty string the relevant
177			property is guessed from the widget's type.
178			widget_property_notifier Signal Notifier signal which is fired by the
179			widget when the data changed. If None
180			this is determined directly from the
181			property.
182			Example usage:
183			QLineEdit().editingFinished
184			Default: None
185			converter Converter converter instance for converting data between
186			widget display and model.
187			Default: None
188
189			"""
190			# guess widget property if not specified
191			if widget_property_name == '':
192			widget_property_name = self._get_property_from_widget(widget)
193
194			# define key of mapping
195			key = (widget, widget_property_name)
196
197			# check if already exists
198			if key in self._mappings:
199			raise Exception('Property {0} of widget {1} already mapped.'
200			''.format(widget_property_name, repr(widget)))
201
202			# check if widget property is available
203			index = widget.metaObject().indexOfProperty(widget_property_name)
204			if index == -1:
205			raise Exception('Property ''{0}'' of widget ''{1}'' not '
206			'available.'.format(widget_property_name,
207			widget.__class__.__name__))
208
209			meta_property = widget.metaObject().property(index)
210
211			# widget property notifier
212			if widget_property_notifier is None:
213			# check that widget property as a notify signal
214			if not meta_property.hasNotifySignal():
215			raise Exception('Property ''{0}'' of widget ''{1}'' has '
216			'no notify signal.'.format(
217			widget_property_name,
218			widget.__class__.__name__))
219			widget_property_notifier = getattr(
220			widget,
221			meta_property.notifySignal().name().data().decode('utf8'))
222
223			# check that widget property is readable
224			if not meta_property.isReadable():
225			raise Exception('Property ''{0}'' of widget ''{1}'' is not '
226			'readable.'.format(widget_property_name,
227			widget.__class__.__name__))
228			widget_property_getter = meta_property.read
229			# check that widget property is writable if requested
230			if not meta_property.isWritable():
231			raise Exception('Property ''{0}'' of widget ''{1}'' is not '
232			'writable.'.format(widget_property_name,
233			widget.__class__.__name__))
234			widget_property_setter = meta_property.write
235
236			if isinstance(model_getter, str):
237			# check if it is a property
238			attr = getattr(model.__class__, model_getter, None)
239			if attr is None:
240			raise Exception('Model has no attribute {0}'.format(
241			model_getter))
242			if isinstance(attr, property):
243			# retrieve getter from property
244			model_property_name = model_getter
245			model_getter = functools.partial(attr.fget, model)
246			# if no setter was specified, get it from the property
247			if model_setter is None:
248			model_setter = functools.partial(attr.fset, model)
249			if model_getter is None:
250			raise Exception('Attribute {0} of model is readonly.'
251			''.format(model_property_name))
252			if isinstance(model_setter, str):
253			model_setter_name = model_setter
254			model_setter = getattr(model, model_setter)
255			if not callable(model_setter):
256			raise Exception('{0} is not callable'.format(
257			model_setter_name))
258			if isinstance(model_property_notifier, str):
259			model_property_notifier = getattr(model, model_property_notifier)
260
261			# connect to widget property notifier
262			widget_property_notifier_slot = functools.partial(
263			self._on_widget_property_notification, key)
264			widget_property_notifier.connect(widget_property_notifier_slot)
265
266			# if model_notify_signal was specified, connect to it
267			model_property_notifier_slot = None
268			if model_property_notifier is not None:
269			model_property_notifier_slot = functools.partial(
270			self._on_model_notification, key)
271			model_property_notifier.connect(model_property_notifier_slot)
272			# save mapping
273			self._mappings[key] = {
274			'widget_property_name': widget_property_name,
275			'widget_property_getter': widget_property_getter,
276			'widget_property_setter': widget_property_setter,
277			'widget_property_notifier': widget_property_notifier,
278			'widget_property_notifier_slot': widget_property_notifier_slot,
279			'widget_property_notifications_disabled': False,
280			'model': model,
281			'model_property_setter': model_setter,
282			'model_property_getter': model_getter,
283			'model_property_notifier': model_property_notifier,
284			'model_property_notifier_slot': model_property_notifier_slot,
285			'model_property_notifications_disabled': False,
286			'converter': converter}
287
288			def _on_widget_property_notification(self, key, *args):
289			"""
290			Event handler for widget property change notification. Used with
291			functools.partial to get the widget as first parameter.
292
293			Parameters
294			==========
295			key: (QtWidget, str) The key consisting of widget and property name,
296			the notification signal was emitted from.
297			args*: List list of event parameters
298			"""
299			widget, widget_property_name = key
300			if self._mappings[key]['widget_property_notifications_disabled']:
301			return
302			if self._submit_policy == SUBMIT_POLICY_AUTO:
303			self._mappings[key][
304			'model_property_notifications_disabled'] = True
305			try:
306			# get value
307			value = self._mappings[key]['widget_property_getter'](
308			widget)
309			# convert it if requested
310			if self._mappings[key]['converter'] is not None:
311			value = self._mappings[key][
312			'converter'].widget_to_model(value)
313			# set it to model
314			self._mappings[key]['model_property_setter'](value)
315			finally:
316			self._mappings[key][
317			'model_property_notifications_disabled'] = False
318			else:
319			pass
320
321			def _on_model_notification(self, key, *args):
322			"""
323			Event handler for model data change notification. Used with
324			functools.partial to get the widget as first parameter.
325
326			Parameters
327			==========
328			key: (QtWidget, str) The key consisting of widget and property name
329			the notification signal was emitted from.
330			args*: List list of event parameters
331			"""
332			widget, widget_property_name = key
333			mapping = self._mappings[key]
334			# get value from model
335			value = self._mappings[key]['model_property_getter']()
336
337			# are updates disabled?
338			if self._mappings[key]['model_property_notifications_disabled']:
339			# but check if value has changed first
340			# get value from widget
341			value_widget = self._mappings[key]['widget_property_getter'](
342			widget)
343			# convert it if requested
344			if self._mappings[key]['converter'] is not None:
345			value_widget = self._mappings[key][
346			'converter'].widget_to_model(value_widget)
347			# accept changes, stop if nothing has changed
348			if (value == value_widget):
349			return
350
351			# convert value if requested
352			if self._mappings[key]['converter'] is not None:
353			value = self._mappings[key]['converter'].model_to_widget(value)
354
355			# update widget
356			self._mappings[key][
357			'widget_property_notifications_disabled'] = True
358			try:
359			self._mappings[key]['widget_property_setter'](widget, value)
360			finally:
361			self._mappings[key][
362			'widget_property_notifications_disabled'] = False
363
364			def clear_mapping(self):
365			"""
366			Clears all mappings.
367			"""
368			# convert iterator to list because the _mappings dictionary will
369			# change its size during iteration
370			for key in list(self._mappings.keys()):
371			self.remove_mapping(key)
372
373			def remove_mapping(self, widget, widget_property_name=''):
374			"""
375			Removes the mapping which maps the QtWidget widget to some model data.
376
377			Parameters
378			==========
379			widget: QtWidget/(QtWidget, str) widget the mapping is attached to
380			or a tuple containing the widget and the
381			widget's property name
382			widget_property_name: str name of the property of the widget we are
383			dealing with. If '' it will be determined
384			from the widget.
385			Default: ''
386			"""
387			if isinstance(widget, tuple):
388			widget, widget_property_name = widget
389			# guess widget property if not specified
390			if widget_property_name == '':
391			widget_property_name = self._get_property_from_widget(widget)
392			# define key
393			key = (widget, widget_property_name)
394			# check that key has a mapping
395			if not key in self._mappings:
396			raise Exception('Widget {0} is not mapped.'.format(repr(widget)))
397			# disconnect signals
398			self._mappings[key]['widget_property_notifier'].disconnect(
399			self._mappings[key]['widget_property_notifier_slot'])
400			if self._mappings[key]['model_property_notifier'] is not None:
401			self._mappings[key]['model_property_notifier'].disconnect(
402			self._mappings[key]['model_property_notifier_slot'])
403			# remove from dictionary
404			del self._mappings[key]
405
406			@property
407			def submit_policy(self):
408			"""
409			Returns the submit policy.
410			"""
411			return self._submit_policy
412
413			@submit_policy.setter
414			def submit_policy(self, policy):
415			"""
416			Sets submit policy.
417
418			Submit policy can either be SUBMIT_POLICY_AUTO or
419			SUBMIT_POLICY_MANUAL. If the submit policy is auto then changes in
420			the widgets are automatically submitted to the model. If manual
421			call submit() to submit it.
422
423			Parameters
424			==========
425			policy: enum submit policy
426			"""
427			if policy not in [SUBMIT_POLICY_AUTO, SUBMIT_POLICY_MANUAL]:
428			raise Exception('Unknown submit policy ''{0}'''.format(policy))
429			self._submit_policy = policy
430
431			def submit(self):
432			"""
433			Submits the current values stored in the widgets to the models.
434			"""
435			# make sure it is called from main thread
436			if (not QThread.currentThread() == QCoreApplication.instance(
437			).thread()):
438			QTimer.singleShot(0, self.submit)
439			return
440
441			submit_policy = self._submit_policy
442			self.submit_policy = SUBMIT_POLICY_AUTO
443			try:
444			for key in self._mappings:
445			self._on_widget_property_notification(key)
446			finally:
447			self.submit_policy = submit_policy
448
449			def revert(self):
450			"""
451			Takes the data stored in the models and displays them in the widgets.
452			"""
453			# make sure it is called from main thread
454			if (not QThread.currentThread() == QCoreApplication.instance(
455			).thread()):
456			QTimer.singleShot(0, self.revert)
457			return
458
459			for key in self._mappings:
460			self._on_model_notification(key)
461

Ulm-IQO / qudi

Push — pulsed_with_queued_connections ( 8830a7...cddfb2 )

Mapper.add_mapping() F

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