Table of contents
1. The actual combat scene
Practical scenario: How to create PyQt6 event objects in Python
2. Main points of knowledge
Three, rookie combat
The event object is a Python object that contains a series of attributes describing the event, depending on the triggering event.
import sys
from PyQt6.QtCore import Qt
from PyQt6.QtWidgets import QWidget, QApplication, QGridLayout, QLabel
class Example(QWidget):
def __init__(self):
super().__init__()
self.initUI()
def initUI(self):
grid = QGridLayout()
x = 0
y = 0
self.text = f'x: {x}, y: {y}'
self.label = QLabel(self.text, self)
grid.addWidget(self.label, 0, 0, Qt.Alignment.AlignTop)
self.setMouseTracking(True)
self.setLayout(grid)
self.setGeometry(300, 300, 450, 300)
self.setWindowTitle('Event object')
self.show()
def mouseMoveEvent(self, e):
x = int(e.position().x())
y = int(e.position().y())
text = f'x: {x}, y: {y}'
self.label.setText(text)
def main():
app = QApplication(sys.argv)
ex = Example()
sys.exit(app.exec())
if __name__ == '__main__':
main()In this example, in the label component, the coordinates of the mouse are displayed.
self.setMouseTracking(True)Mouse tracking is disabled by default. When the mouse is moved, the component can only receive events when the mouse is pressed. Turn on mouse tracking, and you can also receive events by moving the mouse without pressing the mouse button.
def mouseMoveEvent(self, e):
x = int(e.position().x())
y = int(e.position().y())
...e is the event object, which contains the data when the event was triggered. Through the position().x() and e.position().y() method, the coordinate value of the mouse can be obtained.
self.text = f'x: {x}, y: {y}'
self.label = QLabel(self.text, self)
Coordinate values x and y are displayed in the QLabel component.
Rookie combat, keep learning!