Calculadora: keyPressEvent do QLineEdit e criando um Signal

aula202-calculadora/display.py

@@ -1,9 +1,12 @@
-from PySide6.QtCore import Qt
+from PySide6.QtCore import Qt, Signal
+from PySide6.QtGui import QKeyEvent
 from PySide6.QtWidgets import QLineEdit
 from variables import BIG_FONT_SIZE, MINIMUM_WIDTH, TEXT_MARGIN
 
 
 class Display(QLineEdit):
+    eqRequested = Signal()
+
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
         self.configStyle()
@@ -15,3 +18,14 @@ class Display(QLineEdit):
         self.setMinimumWidth(MINIMUM_WIDTH)
         self.setAlignment(Qt.AlignmentFlag.AlignRight)
         self.setTextMargins(*margins)
+
+    def keyPressEvent(self, event: QKeyEvent) -> None:
+        key = event.key()
+        KEYS = Qt.Key
+
+        isEnter = key in [KEYS.Key_Enter, KEYS.Key_Return]
+
+        if isEnter:
+            print('Enter pressionado, sinal emitido', type(self).__name__)
+            self.eqRequested.emit()
+            return event.ignore()