Use QtPy abstraction layer (#144). GHA tests with PySide2 and PyQt5 (#146)

- Use `qtpy` as virtual Qt binding package. GHA unit tests are run with PySide2 and PyQt5 (#146)
- Add `pyqt_env.yml`  and `pyside_env.yml` environment files (#146)
- Update `CONTRIBUTING.md`, `README.md` and add documentation file (#146)

Co-authored-by: Sam Tygier <[email protected]> Danica Sugic <[email protected]>

Author: paskino

.github/workflows/test.yml

@@ -10,14 +10,17 @@ jobs:
     strategy:
       matrix:
         python: [3.8, 3.11]
+        qtbindings: ['PySide2', 'PyQt5']
     steps:
     - uses: actions/checkout@v4
       with:
         fetch-depth: 0
     - uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python }}
+        qt-bindings: ${{ matrix.qtbindings }}
     - run: pip install -U .[dev]
+    - run: pip install ${{ matrix.qtbindings }}
     - run: pytest
   deploy:
     needs: [test]

CHANGELOG.md

@@ -1,3 +1,8 @@
+# Version 2.0.0
+- Use `qtpy` as virtual Qt binding package. GHA unit tests are run with PySide2 and PyQt5 (#146)
+- Add `pyqt_env.yml`  and `pyside_env.yml` environment files (#146)
+- Update `CONTRIBUTING.md`, `README.md` and add documentation file (#146)
+
 # Version 1.0.2
 - Upgrade python to 3.8 in `test.yml` (#171)
 - Rename `/scripts` directory to `/recipe` (#161)

CONTRIBUTING.md

@@ -32,6 +32,15 @@ cd eqt
 mamba env create -f recipe/eqt_env.yml
 ```
 
+`eqt` uses the [`qtpy`](https://github.com/spyder-ide/qtpy) abstraction layer for Qt bindings, meaning that it works with either PySide or PyQt bindings. Thus, `eqt_env` does not depend on either. The environment can be updated with either `pyside2` or `pyqt5`, as follows.
+```sh
+mamba env update --name eqt_env --file pyside_env.yml
+```
+or
+```sh
+mamba env update --name eqt_env --file pyqt_env.yml
+```
+
 4. Activate the environment:
 ```sh
 mamba activate eqt_env

Documentation.md

@@ -0,0 +1,78 @@
+# Documentation for eqt
+
+## Running asynchronous tasks
+
+To run a function in a separate thread we use a `Worker` which is a subclass of a `QRunnable`.
+
+For the `Worker` to work one needs to define:
+
+1. the function that does what you need
+2. Optional callback methods to get the status of the thread by means of `QtCore.QSignal`s
+
+On [initialisation](https://github.com/TomographicImaging/eqt/blob/535e487d09d928713d7d6aa1123657597627c4b0/eqt/threading/QtThreading.py#L32-L38) of the `Worker` the user needs to pass the function that has to run in the thread, i.e. `fn` below, and additional optional positional and keyword arguments, which will be passed on to the actual function that is run in the `QRunnable`.
+
+```python
+class Worker(QtCore.QRunnable):
+    def __init__(self, fn, *args, **kwargs):
+        self.fn = fn
+        self.args = args
+        self.kwargs = kwargs
+        self.signals = WorkerSignals()
+```
+
+In practice the user will need to pass to the `Worker` as many parameters as there are listed in the [function](https://github.com/TomographicImaging/eqt/blob/535e487d09d928713d7d6aa1123657597627c4b0/eqt/threading/QtThreading.py#L56) to be run.
+
+```python
+result = self.fn(*self.args, **self.kwargs)
+```
+
+But `Worker` will [add](https://github.com/TomographicImaging/eqt/blob/535e487d09d928713d7d6aa1123657597627c4b0/eqt/threading/QtThreading.py#L41-L43) to the `**kwargs` the following `QSignal`.
+
+```python
+        # Add progress callback to kwargs
+        self.kwargs['progress_callback'] = self.signals.progress
+        self.kwargs['message_callback'] = self.signals.message
+        self.kwargs['status_callback'] = self.signals.status
+```
+
+Therefore it is advisable to always have `**kwargs` in the function `fn` signature so that you can access the `QSignal` and emit the signal required. For instance one could emit a progress by:
+
+```python
+def fn(num_iter, **kwargs):
+    progress_callback = kwargs.get('progress_callback', None)
+    for i in range(num_iter):
+        do_something
+        if progress_callback is not None:
+            progress_callback.emit( i )
+```
+
+### Passing a signal to a Worker
+
+This is done just after one has defined the `Worker`:
+
+```python
+def handle_progress(num_iter):
+    # do something with the progress
+    print ("Current progress is ", num_iter)
+
+worker = Worker(fn, 10)
+worker.signals.progress.connect(handle_progress)
+```
+
+So, each time `fn` comes to `progress_callback.emit( i )` the function `handle_progress` will be called with the parameter `i` of its `for` loop.
+
+### Signals available
+
+The signals that are available in the `Worker` class are defined in [`WorkerSignal`](https://github.com/TomographicImaging/eqt/blob/535e487d09d928713d7d6aa1123657597627c4b0/eqt/threading/QtThreading.py#L66) and are the following. Below you can also see the type of data that each signal can emit.
+
+```python
+finished = QtCore.Signal()
+error = QtCore.Signal(tuple)
+result = QtCore.Signal(object)
+
+progress = QtCore.Signal(int)
+message = QtCore.Signal(str)
+status = QtCore.Signal(tuple)
+```
+
+Read more on [Qt signals and slots](https://doc.qt.io/qt-5/signalsandslots.html) and on how to use them in [PySide2](https://wiki.qt.io/Qt_for_Python_Signals_and_Slots).

README.md

@@ -4,12 +4,13 @@
 
 Templates & tools to develop Qt GUIs in Python.
 
-One use case is accepting user input while running another task asynchronously (so that the UI is still responsive).
-
+Some example classes are
 1. `UIFormWidget`: a class to help creating Qt forms programmatically, useable in `QDockWidgets` and `QWidget`
 2. `FormDialog`: a `QDialog` with a form inside with <kbd>OK</kbd> and <kbd>Cancel</kbd> buttons
 3. `Worker`: a class that defines a `QRunnable` to handle worker thread setup, signals and wrap up
 
+One use case is accepting a user input while running another task asynchronously (so that the UI is still responsive).
+
 ## Installation
 
 Via `pip`/`conda`/`mamba`, i.e. any of the following:
@@ -18,86 +19,16 @@ Via `pip`/`conda`/`mamba`, i.e. any of the following:
 - `conda install -c conda-forge eqt`
 - `mamba install -c conda-forge eqt`
 
-## Examples
-
-See the [`examples`](examples) directory, e.g. how to launch a `QDialog` with a form inside using `eqt`'s [`QWidget`](examples/dialog_example.py) or [`FormDialog`](examples/dialog_example_2.py).
-
-### Running asynchronous tasks
-
-To run a function in a separate thread we use a `Worker` which is a subclass of a `QRunnable`.
-
-For the `Worker` to work one needs to define:
-
-1. the function that does what you need
-2. Optional callback methods to get the status of the thread by means of `QtCore.QSignal`s
-
-On [initialisation](https://github.com/TomographicImaging/eqt/blob/535e487d09d928713d7d6aa1123657597627c4b0/eqt/threading/QtThreading.py#L32-L38) of the `Worker` the user needs to pass the function that has to run in the thread, i.e. `fn` below, and additional optional positional and keyword arguments, which will be passed on to the actual function that is run in the `QRunnable`.
-
-```python
-class Worker(QtCore.QRunnable):
-    def __init__(self, fn, *args, **kwargs):
-        self.fn = fn
-        self.args = args
-        self.kwargs = kwargs
-        self.signals = WorkerSignals()
-```
-
-In practice the user will need to pass to the `Worker` as many parameters as there are listed in the [function](https://github.com/TomographicImaging/eqt/blob/535e487d09d928713d7d6aa1123657597627c4b0/eqt/threading/QtThreading.py#L56) to be run.
-
-```python
-result = self.fn(*self.args, **self.kwargs)
-```
 
-But `Worker` will [add](https://github.com/TomographicImaging/eqt/blob/535e487d09d928713d7d6aa1123657597627c4b0/eqt/threading/QtThreading.py#L41-L43) to the `**kwargs` the following `QSignal`.
+#### Note:
+`eqt` uses the [`qtpy`](https://github.com/spyder-ide/qtpy) abstraction layer for Qt bindings, meaning that it works with either PySide or PyQt bindings. Thus, the package does not depend on either. If the environment does not already have a Qt binding then the user *must* install either `pyside2` or `pyqt5`.
 
-```python
-        # Add progress callback to kwargs
-        self.kwargs['progress_callback'] = self.signals.progress
-        self.kwargs['message_callback'] = self.signals.message
-        self.kwargs['status_callback'] = self.signals.status
-```
-
-Therefore it is advisable to always have `**kwargs` in the function `fn` signature so that you can access the `QSignal` and emit the signal required. For instance one could emit a progress by:
-
-```python
-def fn(num_iter, **kwargs):
-    progress_callback = kwargs.get('progress_callback', None)
-    for i in range(num_iter):
-        do_something
-        if progress_callback is not None:
-            progress_callback.emit( i )
-```
-
-### Passing a signal to a Worker
-
-This is done just after one has defined the `Worker`:
-
-```python
-def handle_progress(num_iter):
-    # do something with the progress
-    print ("Current progress is ", num_iter)
-
-worker = Worker(fn, 10)
-worker.signals.progress.connect(handle_progress)
-```
-
-So, each time `fn` comes to `progress_callback.emit( i )` the function `handle_progress` will be called with the parameter `i` of its `for` loop.
-
-### Signals available
-
-The signals that are available in the `Worker` class are defined in [`WorkerSignal`](https://github.com/TomographicImaging/eqt/blob/535e487d09d928713d7d6aa1123657597627c4b0/eqt/threading/QtThreading.py#L66) and are the following. Below you can also see the type of data that each signal can emit.
-
-```python
-finished = QtCore.Signal()
-error = QtCore.Signal(tuple)
-result = QtCore.Signal(object)
+## Examples
 
-progress = QtCore.Signal(int)
-message = QtCore.Signal(str)
-status = QtCore.Signal(tuple)
-```
+See the [`examples`](examples) directory, e.g. how to launch a `QDialog` with a form inside using `eqt`'s [`QWidget`](examples/dialog_example.py) or [`FormDialog`](examples/dialog_example_2.py).
 
-Read more on [Qt signals and slots](https://doc.qt.io/qt-5/signalsandslots.html) and on how to use them in [PySide2](https://wiki.qt.io/Qt_for_Python_Signals_and_Slots).
+## Documentation
+See [Documentation.md](./Documentation.md).
 
 ## Developer Contribution Guide
 See [CONTRIBUTING.md](./CONTRIBUTING.md).

eqt/threading/QtThreading.py

@@ -7,8 +7,8 @@
 # https://www.geeksforgeeks.org/migrate-pyqt5-app-to-pyside2
 import traceback
 
-from PySide2 import QtCore
-from PySide2.QtCore import Slot
+from qtpy import QtCore
+from qtpy.QtCore import Slot
 
 
 class Worker(QtCore.QRunnable):

eqt/ui/FormDialog.py

@@ -1,4 +1,4 @@
-from PySide2 import QtCore, QtWidgets
+from qtpy import QtCore, QtWidgets
 
 from . import UIFormFactory
 

eqt/ui/MainWindowWithProgressDialogs.py

@@ -1,9 +1,9 @@
 import qdarkstyle
-from PySide2.QtCore import QSettings, QThreadPool
-from PySide2.QtGui import QKeySequence
-from PySide2.QtWidgets import QAction, QMainWindow
 from qdarkstyle.dark.palette import DarkPalette
 from qdarkstyle.light.palette import LightPalette
+from qtpy.QtCore import QSettings, QThreadPool
+from qtpy.QtGui import QKeySequence
+from qtpy.QtWidgets import QAction, QMainWindow
 
 from .ProgressTimerDialog import ProgressTimerDialog
 from .SessionDialogs import AppSettingsDialog

eqt/ui/MainWindowWithSessionManagement.py

@@ -4,8 +4,8 @@
 from datetime import datetime
 from functools import partial
 
-from PySide2.QtGui import QCloseEvent, QKeySequence
-from PySide2.QtWidgets import QAction
+from qtpy.QtGui import QCloseEvent, QKeySequence
+from qtpy.QtWidgets import QAction
 
 from ..io import zip_directory
 from ..threading import Worker

eqt/ui/NoBorderScrollArea.py

@@ -1,7 +1,7 @@
 import re
 
 import qdarkstyle
-from PySide2.QtWidgets import QPushButton, QScrollArea, QWidget
+from qtpy.QtWidgets import QPushButton, QScrollArea, QWidget
 
 
 class NoBorderScrollArea(QScrollArea):

eqt/ui/ProgressTimerDialog.py

@@ -1,9 +1,9 @@
 import time
 from time import sleep
 
-from PySide2 import QtCore
-from PySide2.QtCore import Qt, QThreadPool
-from PySide2.QtWidgets import QProgressDialog
+from qtpy import QtCore
+from qtpy.QtCore import Qt, QThreadPool
+from qtpy.QtWidgets import QProgressDialog
 
 from ..threading import Worker
 

eqt/ui/ReOrderableListWidget.py

@@ -1,4 +1,4 @@
-from PySide2 import QtCore, QtWidgets
+from qtpy import QtCore, QtWidgets
 
 
 class ReOrderableListWidget(QtWidgets.QTableWidget):

eqt/ui/SessionDialogs.py

@@ -1,7 +1,7 @@
 import os
 
-from PySide2 import QtWidgets
-from PySide2.QtWidgets import (
+from qtpy import QtWidgets
+from qtpy.QtWidgets import (
     QCheckBox,
     QComboBox,
     QFileDialog,

eqt/ui/UIFormWidget.py

@@ -1,6 +1,6 @@
 from warnings import warn
 
-from PySide2 import QtWidgets
+from qtpy import QtWidgets
 
 from .UISliderWidget import UISliderWidget
 

eqt/ui/UIMultiStepWidget.py

@@ -1,6 +1,6 @@
-from PySide2 import QtWidgets
-from PySide2.QtCore import Qt
-from PySide2.QtWidgets import QGroupBox, QHBoxLayout, QPushButton
+from qtpy import QtWidgets
+from qtpy.QtCore import Qt
+from qtpy.QtWidgets import QGroupBox, QHBoxLayout, QPushButton
 
 
 class UIMultiStepWidget(object):

eqt/ui/UISliderWidget.py

@@ -1,5 +1,5 @@
-from PySide2 import QtCore
-from PySide2.QtWidgets import QSlider
+from qtpy import QtCore
+from qtpy.QtWidgets import QSlider
 
 
 class UISliderWidget(QSlider):

eqt/ui/UIStackedWidget.py

@@ -1,6 +1,6 @@
-from PySide2 import QtWidgets
-from PySide2.QtCore import Qt
-from PySide2.QtWidgets import QHBoxLayout, QListWidget, QStackedWidget, QVBoxLayout, QWidget
+from qtpy import QtWidgets
+from qtpy.QtCore import Qt
+from qtpy.QtWidgets import QHBoxLayout, QListWidget, QStackedWidget, QVBoxLayout, QWidget
 
 from .UIFormWidget import UIFormFactory
 

examples/MainWindowWithSessionManagement_example.py

@@ -1,7 +1,7 @@
 import sys
 
-from PySide2 import QtWidgets
-from PySide2.QtWidgets import QApplication
+from qtpy import QtWidgets
+from qtpy.QtWidgets import QApplication
 
 from eqt import __version__
 from eqt.ui.MainWindowWithSessionManagement import MainWindowWithSessionManagement

examples/NoBorderScrollArea_example.py

@@ -1,7 +1,7 @@
 import sys
 
-from PySide2 import QtWidgets
-from PySide2.QtWidgets import QPushButton
+from qtpy import QtWidgets
+from qtpy.QtWidgets import QPushButton
 
 from eqt.ui.NoBorderScrollArea import NoBorderScrollArea
 

examples/advanced_dialog_example.py

@@ -1,7 +1,7 @@
 import sys
 
 import utilitiesForExamples
-from PySide2 import QtWidgets
+from qtpy import QtWidgets
 
 from eqt.ui.FormDialog import AdvancedFormDialog
 from eqt.ui.UIFormWidget import FormWidget

examples/dialog_example.py

@@ -1,6 +1,6 @@
 import sys
 
-from PySide2 import QtWidgets
+from qtpy import QtWidgets
 
 from eqt.ui import UIFormFactory
 

examples/dialog_example_2.py

@@ -1,6 +1,6 @@
 import sys
 
-from PySide2 import QtWidgets
+from qtpy import QtWidgets
 
 from eqt.ui import FormDialog
 

examples/dialog_example_3_save_default.py

@@ -1,7 +1,7 @@
 import sys
 
 import utilitiesForExamples as utex
-from PySide2 import QtWidgets
+from qtpy import QtWidgets
 
 from eqt.ui import FormDialog