Last updated:
0 purchases
pysidecallbacks 0.1.1
pyside-callbacks
GitHub repository: https://github.com/schang412/pyside-callbacks
A small library that provides utility decorators for simplifying the creation of PySide6 UI. This package also contains
a mypy plugin to assist in the type-checking the signals according to the parameters.
The QT Designer workflow with Python would look like this:
Use QT Designer to create main_win.ui file.
Use uic to compile main_win.ui into main_win.py
Sub-Class the class defined in main_win.py.
Connect the signals to their handlers.
import main_win
from PySide6 import QtWidgets
class MyQtApp(main_win.Ui_MainWindow, QtWidgets.QMainWindow):
def __init__(self) -> None:
super().__init__()
self.setupUi(self)
self.pushButton.clicked.connect(self.line_edit_return_pressed)
self.lineEdit.returnPressed.connect(self.line_edit_return_pressed)
def line_edit_return_pressed(self) -> None:
cmd = self.lineEdit.text()
if not cmd:
return
self.lineEdit.setText("")
self.display.appendPlainText(cmd)
However, this connection method does not inherently offer type-checking and could be improved using decorators:
import main_win
from PySide6 import QtWidgets
import pyside_callbacks
@pyside_callbacks.pyside_callbacks
class MyQtApp(main_win.Ui_MainWindow, QtWidgets.QMainWindow):
def __init__(self) -> None:
super().__init__()
self.setupUi(self)
@pyside_callbacks.widget_event("pushButton", "clicked")
@pyside_callbacks.widget_event("lineEdit", "returnPressed")
def line_edit_return_pressed(self) -> None:
cmd = self.lineEdit.text()
if not cmd:
return
self.lineEdit.setText("")
self.display.appendPlainText(cmd)
Note that we need to decorate both the class and the method because we need to add a hook to the __init__ method in order to
register the callback to the class instance. The way that we keep track of the callbacks requires that the widget_event decorator
is the outermost decorator. However, currently, the mypy plugin expects only widget_event callbacks on functions that use it.
In other words, we cannot mix @widget_event with other decorators (for example, @staticmethod).
We can also include a mypy plugin to ensure that our signals are correct. We add the pyside_callbacks_mypy plugin and suppress the errors from the uic generated file.
[tool.mypy]
plugins = [
"pyside_callbacks_mypy.plugin"
]
[[tool.mypy.overrides]]
module = "main_win"
ignore_errors = true
Adding the following lines to the example application:
@pyside_callbacks.widget_event("lineEdit", "cursorPositionChanged")
def curpos_changed(self, b: str) -> None:
print("changed cursor position!")
Then, running mypy we will find the errors:
example/my_app/app.py:34: error: Argument 2 to "curpos_changed" has incompatible type "str"; Emitted signal will expect type "int". [arg-type]
example/my_app/app.py:34: error: Too many arguments for "curpos_changed"; Emitted signal will supply ["int", "int"] [call-arg]
Found 2 errors in 1 file (checked 2 source files)
Note that we have to add a type-hint to main_win.Ui_MainWindow.setupUi otherwise dynamic types (typing.Any) will be inferred for all the widgets.
For personal and professional use. You cannot resell or redistribute these repositories in their original state.
There are no reviews.