PyQt

PyQt

1. Event-loop

1. event queue

2. event loop

3. event handler

2. Signal / Slot

signal	Event loop manager	slot
action	dispatcher	store / view

callback = [1] pointer to function, [2] compare to signal-slot, callback may type-mismatch

event occur -> signal emit -> slot response

2.1 widget.signal

button.clicked.connect(slot_function) // widget.signal.connect(slot_function)

2.2 customized signal

class Example(QMainWindow):
    closeApp = pyqtSignal() 

    def __init__(self):
        super().__init__()
        self.initUI()


    def initUI(self):      
        self.closeApp.connect(self.close) // signal.connect.(slot_function) // without widget
        ...

    def mousePressEvent(self, event):
        self.closeApp.emit() // signal.emit