CODEWITHSUNDEEP
pythonpyqt4keypress
JoeMicro
JoeMicro

Reputation: 183

How to capture the Key_tab event

i am trying to capture the key_tab event, but no luck. i realized that it only works if there are no other widgets so the cursor has no where to go only then can i get the event to return. here is a simplified code sample.

class MyCombo(QComboBox):

    def __init__(self, parent=None):
        super(MyCombo, self).__init__(parent)
        self.setEditable(True)

    def keyPressEvent(self, event):
        if (event.type() == QEvent.KeyPress) and (event.key() == Qt.Key_Tab):
            print "tab pressed"
        elif event.key() == Qt.Key_Return:
            print "return pressed"
        else:
            QComboBox.keyPressEvent(self, event)

class Form_1(QDialog):

    def __init__(self, parent=None):
        super(Form_1, self).__init__(parent)
        self.combo = MyCombo()
        self.line = QLineEdit()
        layout = QVBoxLayout()
        layout.addWidget(self.combo)
        layout.addWidget(self.line)
        self.setLayout(layout)

app = QApplication(sys.argv)
form = Form_1()
form.show()
app.exec_()

if i comment out the following two lines

self.line = QLineEdit()
layout.addWidget(self.line)

then it works fine, because there is only one widget left on the form.

where am i going wrong?

Cheers, Joe

Upvotes: 2

Views: 3029

Answers (1)

JoeMicro
JoeMicro

Reputation: 183

Apparently the Key_Tab press event is never passed to any handler but to the setFocus() so in order to intercept the Key_Tab event, we need to implement the event() method itself. so here is the new code:

class MyCombo(QComboBox):

    def __init__(self, parent=None):
        super(MyCombo, self).__init__(parent)
        self.setEditable(True)

    def keyPressEvent(self, event):
        if event.key() == Qt.Key_Return:
            print "return pressed"
        else:
            QComboBox.keyPressEvent(self, event)

    def event(self, event):
        if event.type() == QEvent.KeyPress and event.key() == Qt.Key_Tab:
            print "tab pressed"
            return False
        return QWidget.event(self, event)

class Form_1(QDialog):

    def __init__(self, parent=None):
        super(Form_1, self).__init__(parent)
        self.combo = MyCombo()
        self.line = QLineEdit()
        layout = QVBoxLayout()
        layout.addWidget(self.combo)
        layout.addWidget(self.line)
        self.setLayout(layout)

Upvotes: 1

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