Calculadora: capturando teclas ENTER, Backspace e ESC

aula202-calculadora/buttons.py

@@ -63,7 +63,9 @@ class ButtonsGrid(QGridLayout):
         print('Signal recebido por "vouApagarVocê" em', type(self).__name__)
 
     def _makeGrid(self):
-        self.display.eqRequested.connect(self.vouApagarVocê)
+        self.display.eqPressed.connect(self.vouApagarVocê)
+        self.display.delPressed.connect(self.display.backspace)
+        self.display.clearPressed.connect(self.vouApagarVocê)
 
         for rowNumber, rowData in enumerate(self._gridMask):
             for colNumber, buttonText in enumerate(rowData):

aula202-calculadora/display.py

@@ -1,11 +1,14 @@
 from PySide6.QtCore import Qt, Signal
 from PySide6.QtGui import QKeyEvent
 from PySide6.QtWidgets import QLineEdit
+from utils import isEmpty
 from variables import BIG_FONT_SIZE, MINIMUM_WIDTH, TEXT_MARGIN
 
 
 class Display(QLineEdit):
-    eqRequested = Signal()
+    eqPressed = Signal()
+    delPressed = Signal()
+    clearPressed = Signal()
 
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
@@ -20,12 +23,31 @@ class Display(QLineEdit):
         self.setTextMargins(*margins)
 
     def keyPressEvent(self, event: QKeyEvent) -> None:
+        text = event.text().strip()
         key = event.key()
         KEYS = Qt.Key
 
         isEnter = key in [KEYS.Key_Enter, KEYS.Key_Return]
+        isDelete = key in [KEYS.Key_Backspace, KEYS.Key_Delete]
+        isEsc = key in [KEYS.Key_Escape]
 
         if isEnter:
             print('Enter pressionado, sinal emitido', type(self).__name__)
-            self.eqRequested.emit()
+            self.eqPressed.emit()
             return event.ignore()
+
+        if isDelete:
+            print('isDelete pressionado, sinal emitido', type(self).__name__)
+            self.delPressed.emit()
+            return event.ignore()
+
+        if isEsc:
+            print('isEsc pressionado, sinal emitido', type(self).__name__)
+            self.clearPressed.emit()
+            return event.ignore()
+
+        # Não passar daqui se não tiver texto
+        if isEmpty(text):
+            return event.ignore()
+
+        print('Texto', text)