UiLoader.createWidget() - Code Metrics - spyder-ide/qtpy - Measure and Improve Code Quality continuously with Scrutinizer

UiLoader.createWidget() C
last analyzed 2018-06-13 07:28 UTC

↳ Parent: UiLoader

Complexity

Conditions

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	7
dl	0
loc	36
rs	5.5
c	0
b	0
f	0

import os

from . import PYSIDE, PYSIDE2, PYQT4, PYQT5
from .QtWidgets import QComboBox


if PYQT5:

    from PyQt5.uic import *

elif PYQT4:

    from PyQt4.uic import *

else:

    __all__ = ['loadUi']

    # In PySide, loadUi does not exist, so we define it using QUiLoader, and
    # then make sure we expose that function. This is adapted from qt-helpers
    # which was released under a 3-clause BSD license:
    # qt-helpers - a common front-end to various Qt modules
    #
    # Copyright (c) 2015, Chris Beaumont and Thomas Robitaille
    #
    # All rights reserved.
    #
    # Redistribution and use in source and binary forms, with or without
    # modification, are permitted provided that the following conditions are
    # met:
    #
    #  * Redistributions of source code must retain the above copyright
    #    notice, this list of conditions and the following disclaimer.
    #  * Redistributions in binary form must reproduce the above copyright
    #    notice, this list of conditions and the following disclaimer in the
    #    documentation and/or other materials provided with the
    #    distribution.
    #  * Neither the name of the Glue project nor the names of its contributors
    #    may be used to endorse or promote products derived from this software
    #    without specific prior written permission.
    #
    # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
    # IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
    # THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
    # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
    # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
    # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
    # PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
    # PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
    # LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
    # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
    # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    #
    # Which itself was based on the solution at
    #
    # https://gist.github.com/cpbotha/1b42a20c8f3eb9bb7cb8
    #
    # which was released under the MIT license:
    #
    # Copyright (c) 2011 Sebastian Wiesner <[email protected]>
    # Modifications by Charl Botha <[email protected]>
    #
    # Permission is hereby granted, free of charge, to any person obtaining a
    # copy of this software and associated documentation files (the "Software"),
    # to deal in the Software without restriction, including without limitation
    # the rights to use, copy, modify, merge, publish, distribute, sublicense,
    # and/or sell copies of the Software, and to permit persons to whom the
    # Software is furnished to do so, subject to the following conditions:
    #
    # The above copyright notice and this permission notice shall be included in
    # all copies or substantial portions of the Software.
    #
    # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
    # THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
    # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
    # DEALINGS IN THE SOFTWARE.

    if PYSIDE:
        from PySide.QtCore import QMetaObject
        from PySide.QtUiTools import QUiLoader
    elif PYSIDE2:
        from PySide2.QtCore import QMetaObject
        from PySide2.QtUiTools import QUiLoader

    class UiLoader(QUiLoader):
        """
        Subclass of :class:`~PySide.QtUiTools.QUiLoader` to create the user
        interface in a base instance.

        Unlike :class:`~PySide.QtUiTools.QUiLoader` itself this class does not
        create a new instance of the top-level widget, but creates the user
        interface in an existing instance of the top-level class if needed.

        This mimics the behaviour of :func:`PyQt4.uic.loadUi`.
        """

        def __init__(self, baseinstance, customWidgets=None):
            """
            Create a loader for the given ``baseinstance``.

            The user interface is created in ``baseinstance``, which must be an
            instance of the top-level class in the user interface to load, or a
            subclass thereof.

            ``customWidgets`` is a dictionary mapping from class name to class
            object for custom widgets. Usually, this should be done by calling
            registerCustomWidget on the QUiLoader, but with PySide 1.1.2 on
            Ubuntu 12.04 x86_64 this causes a segfault.

            ``parent`` is the parent object of this loader.
            """

            QUiLoader.__init__(self, baseinstance)

            self.baseinstance = baseinstance

            if customWidgets is None:
                self.customWidgets = {}
            else:
                self.customWidgets = customWidgets

        def createWidget(self, class_name, parent=None, name=''):
            """
            Function that is called for each widget defined in ui file,
            overridden here to populate baseinstance instead.
            """

            if parent is None and self.baseinstance:
                # supposed to create the top-level widget, return the base
                # instance instead
                return self.baseinstance

            else:

                # For some reason, Line is not in the list of available
                # widgets, but works fine, so we have to special case it here.
                if class_name in self.availableWidgets() or class_name == 'Line':
                    # create a new widget for child widgets
                    widget = QUiLoader.createWidget(self, class_name, parent, name)

                else:
                    # If not in the list of availableWidgets, must be a custom
                    # widget. This will raise KeyError if the user has not
                    # supplied the relevant class_name in the dictionary or if
                    # customWidgets is empty.
                    try:
                        widget = self.customWidgets[class_name](parent)
                    except KeyError:
                        raise Exception('No custom widget ' + class_name + ' '
                                        'found in customWidgets')

                if self.baseinstance:
                    # set an attribute for the new child widget on the base
                    # instance, just like PyQt4.uic.loadUi does.
                    setattr(self.baseinstance, name, widget)

                return widget

    def _get_custom_widgets(ui_file):
        """
        This function is used to parse a ui file and look for the <customwidgets>
        section, then automatically load all the custom widget classes.
        """

        import sys
        import importlib
        from xml.etree.ElementTree import ElementTree

        # Parse the UI file
        etree = ElementTree()
        ui = etree.parse(ui_file)

        # Get the customwidgets section
        custom_widgets = ui.find('customwidgets')

        if custom_widgets is None:
            return {}

        custom_widget_classes = {}

        for custom_widget in custom_widgets.getchildren():

            cw_class = custom_widget.find('class').text
            cw_header = custom_widget.find('header').text

            module = importlib.import_module(cw_header)

            custom_widget_classes[cw_class] = getattr(module, cw_class)

        return custom_widget_classes

    def loadUi(uifile, baseinstance=None, workingDirectory=None):
        """
        Dynamically load a user interface from the given ``uifile``.

        ``uifile`` is a string containing a file name of the UI file to load.

        If ``baseinstance`` is ``None``, the a new instance of the top-level
        widget will be created. Otherwise, the user interface is created within
        the given ``baseinstance``. In this case ``baseinstance`` must be an
        instance of the top-level widget class in the UI file to load, or a
        subclass thereof. In other words, if you've created a ``QMainWindow``
        interface in the designer, ``baseinstance`` must be a ``QMainWindow``
        or a subclass thereof, too. You cannot load a ``QMainWindow`` UI file
        with a plain :class:`~PySide.QtGui.QWidget` as ``baseinstance``.

        :method:`~PySide.QtCore.QMetaObject.connectSlotsByName()` is called on
        the created user interface, so you can implemented your slots according
        to its conventions in your widget class.

        Return ``baseinstance``, if ``baseinstance`` is not ``None``. Otherwise
        return the newly created instance of the user interface.
        """

        # We parse the UI file and import any required custom widgets
        customWidgets = _get_custom_widgets(uifile)

        loader = UiLoader(baseinstance, customWidgets)

        if workingDirectory is not None:
            loader.setWorkingDirectory(workingDirectory)

        widget = loader.load(uifile)
        QMetaObject.connectSlotsByName(widget)
        return widget


1			import os
2
3			from . import PYSIDE, PYSIDE2, PYQT4, PYQT5
4			from .QtWidgets import QComboBox
5
6
7			if PYQT5:
8
9			from PyQt5.uic import *
10
11			elif PYQT4:
12
13			from PyQt4.uic import *
14
15			else:
16
17			__all__ = ['loadUi']
18
19			# In PySide, loadUi does not exist, so we define it using QUiLoader, and
20			# then make sure we expose that function. This is adapted from qt-helpers
21			# which was released under a 3-clause BSD license:
22			# qt-helpers - a common front-end to various Qt modules
23			#
24			# Copyright (c) 2015, Chris Beaumont and Thomas Robitaille
25			#
26			# All rights reserved.
27			#
28			# Redistribution and use in source and binary forms, with or without
29			# modification, are permitted provided that the following conditions are
30			# met:
31			#
32			# * Redistributions of source code must retain the above copyright
33			# notice, this list of conditions and the following disclaimer.
34			# * Redistributions in binary form must reproduce the above copyright
35			# notice, this list of conditions and the following disclaimer in the
36			# documentation and/or other materials provided with the
37			# distribution.
38			# * Neither the name of the Glue project nor the names of its contributors
39			# may be used to endorse or promote products derived from this software
40			# without specific prior written permission.
41			#
42			# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
43			# IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
44			# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
45			# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
46			# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
47			# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
48			# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
49			# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
50			# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
51			# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
52			# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
53			#
54			# Which itself was based on the solution at
55			#
56			# https://gist.github.com/cpbotha/1b42a20c8f3eb9bb7cb8
57			#
58			# which was released under the MIT license:
59			#
60			# Copyright (c) 2011 Sebastian Wiesner <[email protected]>
61			# Modifications by Charl Botha <[email protected]>
62			#
63			# Permission is hereby granted, free of charge, to any person obtaining a
64			# copy of this software and associated documentation files (the "Software"),
65			# to deal in the Software without restriction, including without limitation
66			# the rights to use, copy, modify, merge, publish, distribute, sublicense,
67			# and/or sell copies of the Software, and to permit persons to whom the
68			# Software is furnished to do so, subject to the following conditions:
69			#
70			# The above copyright notice and this permission notice shall be included in
71			# all copies or substantial portions of the Software.
72			#
73			# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
74			# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
75			# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
76			# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
77			# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
78			# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
79			# DEALINGS IN THE SOFTWARE.
80
81			if PYSIDE:
82			from PySide.QtCore import QMetaObject
83			from PySide.QtUiTools import QUiLoader
84			elif PYSIDE2:
85			from PySide2.QtCore import QMetaObject
86			from PySide2.QtUiTools import QUiLoader
87
88			class UiLoader(QUiLoader):
89			"""
90			Subclass of :class:`~PySide.QtUiTools.QUiLoader` to create the user
91			interface in a base instance.
92
93			Unlike :class:`~PySide.QtUiTools.QUiLoader` itself this class does not
94			create a new instance of the top-level widget, but creates the user
95			interface in an existing instance of the top-level class if needed.
96
97			This mimics the behaviour of :func:`PyQt4.uic.loadUi`.
98			"""
99
100			def __init__(self, baseinstance, customWidgets=None):
101			"""
102			Create a loader for the given ``baseinstance``.
103
104			The user interface is created in ``baseinstance``, which must be an
105			instance of the top-level class in the user interface to load, or a
106			subclass thereof.
107
108			``customWidgets`` is a dictionary mapping from class name to class
109			object for custom widgets. Usually, this should be done by calling
110			registerCustomWidget on the QUiLoader, but with PySide 1.1.2 on
111			Ubuntu 12.04 x86_64 this causes a segfault.
112
113			``parent`` is the parent object of this loader.
114			"""
115
116			QUiLoader.__init__(self, baseinstance)
117
118			self.baseinstance = baseinstance
119
120			if customWidgets is None:
121			self.customWidgets = {}
122			else:
123			self.customWidgets = customWidgets
124
125			def createWidget(self, class_name, parent=None, name=''):
126			"""
127			Function that is called for each widget defined in ui file,
128			overridden here to populate baseinstance instead.
129			"""
130
131			if parent is None and self.baseinstance:
132			# supposed to create the top-level widget, return the base
133			# instance instead
134			return self.baseinstance
135
136			else:
137
138			# For some reason, Line is not in the list of available
139			# widgets, but works fine, so we have to special case it here.
140			if class_name in self.availableWidgets() or class_name == 'Line':
141			# create a new widget for child widgets
142			widget = QUiLoader.createWidget(self, class_name, parent, name)
143
144			else:
145			# If not in the list of availableWidgets, must be a custom
146			# widget. This will raise KeyError if the user has not
147			# supplied the relevant class_name in the dictionary or if
148			# customWidgets is empty.
149			try:
150			widget = self.customWidgets[class_name](parent)
151			except KeyError:
152			raise Exception('No custom widget ' + class_name + ' '
153			'found in customWidgets')
154
155			if self.baseinstance:
156			# set an attribute for the new child widget on the base
157			# instance, just like PyQt4.uic.loadUi does.
158			setattr(self.baseinstance, name, widget)
159
160			return widget
161
162			def _get_custom_widgets(ui_file):
163			"""
164			This function is used to parse a ui file and look for the <customwidgets>
165			section, then automatically load all the custom widget classes.
166			"""
167
168			import sys
169			import importlib
170			from xml.etree.ElementTree import ElementTree
171
172			# Parse the UI file
173			etree = ElementTree()
174			ui = etree.parse(ui_file)
175
176			# Get the customwidgets section
177			custom_widgets = ui.find('customwidgets')
178
179			if custom_widgets is None:
180			return {}
181
182			custom_widget_classes = {}
183
184			for custom_widget in custom_widgets.getchildren():
185
186			cw_class = custom_widget.find('class').text
187			cw_header = custom_widget.find('header').text
188
189			module = importlib.import_module(cw_header)
190
191			custom_widget_classes[cw_class] = getattr(module, cw_class)
192
193			return custom_widget_classes
194
195			def loadUi(uifile, baseinstance=None, workingDirectory=None):
196			"""
197			Dynamically load a user interface from the given ``uifile``.
198
199			``uifile`` is a string containing a file name of the UI file to load.
200
201			If ``baseinstance`` is ``None``, the a new instance of the top-level
202			widget will be created. Otherwise, the user interface is created within
203			the given ``baseinstance``. In this case ``baseinstance`` must be an
204			instance of the top-level widget class in the UI file to load, or a
205			subclass thereof. In other words, if you've created a ``QMainWindow``
206			interface in the designer, ``baseinstance`` must be a ``QMainWindow``
207			or a subclass thereof, too. You cannot load a ``QMainWindow`` UI file
208			with a plain :class:`~PySide.QtGui.QWidget` as ``baseinstance``.
209
210			:method:`~PySide.QtCore.QMetaObject.connectSlotsByName()` is called on
211			the created user interface, so you can implemented your slots according
212			to its conventions in your widget class.
213
214			Return ``baseinstance``, if ``baseinstance`` is not ``None``. Otherwise
215			return the newly created instance of the user interface.
216			"""
217
218			# We parse the UI file and import any required custom widgets
219			customWidgets = _get_custom_widgets(uifile)
220
221			loader = UiLoader(baseinstance, customWidgets)
222
223			if workingDirectory is not None:
224			loader.setWorkingDirectory(workingDirectory)
225
226			widget = loader.load(uifile)
227			QMetaObject.connectSlotsByName(widget)
228			return widget
229

spyder-ide / qtpy

UiLoader.createWidget() C last analyzed 2018-06-13 07:28 UTC

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UiLoader.createWidget() C
last analyzed 2018-06-13 07:28 UTC