Calculadora: keyPressEvent do QLineEdit e criando um Signal

aula202-calculadora/buttons.py

@@ -59,7 +59,12 @@ class ButtonsGrid(QGridLayout):
         self._equation = value
         self.info.setText(value)
 
+    def vouApagarVocê(self):
+        print('Signal recebido por "vouApagarVocê" em', type(self).__name__)
+
     def _makeGrid(self):
+        self.display.eqRequested.connect(self.vouApagarVocê)
+
         for rowNumber, rowData in enumerate(self._gridMask):
             for colNumber, buttonText in enumerate(rowData):
                 button = Button(buttonText)
@@ -81,7 +86,7 @@ class ButtonsGrid(QGridLayout):
         if text == 'C':
             self._connectButtonClicked(button, self._clear)
 
-        if text in 'D':
+        if text == 'D':
             self._connectButtonClicked(button, self.display.backspace)
 
         if text in '+-/*^':
@@ -90,7 +95,7 @@ class ButtonsGrid(QGridLayout):
                 self._makeSlot(self._operatorClicked, button)
             )
 
-        if text in '=':
+        if text == '=':
             self._connectButtonClicked(button, self._eq)
 
     def _makeSlot(self, func, *args, **kwargs):

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()