Calculadora: criando um Slot com dados para o Signal "clicked" de cada botão

aula202-calculadora/buttons.py

@@ -1,3 +1,5 @@
+from display import Display
+from PySide6.QtCore import Slot
 from PySide6.QtWidgets import QGridLayout, QPushButton
 from utils import isEmpty, isNumOrDot
 from variables import MEDIUM_FONT_SIZE
@@ -13,10 +15,11 @@ class Button(QPushButton):
         font.setPixelSize(MEDIUM_FONT_SIZE)
         self.setFont(font)
         self.setMinimumSize(75, 75)
+        self.setCheckable(True)
 
 
 class ButtonsGrid(QGridLayout):
-    def __init__(self, *args, **kwargs) -> None:
+    def __init__(self, display: Display, *args, **kwargs) -> None:
         super().__init__(*args, **kwargs)
 
         self._gridMask = [
@@ -26,6 +29,7 @@ class ButtonsGrid(QGridLayout):
             ['1', '2', '3', '+'],
             ['',  '0', '.', '='],
         ]
+        self.display = display
         self._makeGrid()
 
     def _makeGrid(self):
@@ -37,3 +41,18 @@ class ButtonsGrid(QGridLayout):
                     button.setProperty('cssClass', 'specialButton')
 
                 self.addWidget(button, rowNumber, colNumber)
+                buttonSlot = self._makeButtonDisplaySlot(
+                    self._insertButtonTextToDisplay,
+                    button,
+                )
+                button.clicked.connect(buttonSlot)  # type: ignore
+
+    def _makeButtonDisplaySlot(self, func, *args, **kwargs):
+        @Slot(bool)
+        def realSlot(_):
+            func(*args, **kwargs)
+        return realSlot
+
+    def _insertButtonTextToDisplay(self, button):
+        button_text = button.text()
+        self.display.insert(button_text)

aula202-calculadora/main.py

@@ -29,7 +29,7 @@ if __name__ == '__main__':
     window.addWidgetToVLayout(display)
 
     # Grid
-    buttonsGrid = ButtonsGrid()
+    buttonsGrid = ButtonsGrid(display)
     window.vLayout.addLayout(buttonsGrid)
 
     # Executa tudo