import sys
from PyQt5.Qt import *
# from PyQt5 import QtGui
class MyWindow(QWidget):
def __init__(self):
super().__init__()
self.setWindowTitle('事件消息')
self.resize(500, 500)
self.move(200, 200)
def showEvent(self, QShowEvent):
print('窗口被展示了')
def closeEvent(self, QCloseEvent):
print('窗口被关闭了')
def moveEvent(self, QMoveEvent):
print('窗口移动')
def resizeEvent(self, QResizeEvent):
print('窗口大小被改变了')
def enterEvent(self, QEvent):
print('鼠标进来了')
self.setStyleSheet('background-color: green;')
def leaveEvent(self, QEvent):
print('鼠标离开')
self.setStyleSheet('background-color: yellow;')
def mousePressEvent(self, QMouseEvent):
print('鼠标按下')
def mouseReleaseEvent(self, QMouseEvent):
print('鼠标松开')
def mouseDoubleClickEvent(self, QMouseEvent):
print('鼠标双击')
def mouseMoveEvent(self, QMouseEvent):
print('鼠标移动')
def keyPressEvent(self, QKeyEvent):
print('键盘按下')
def keyReleaseEvent(self, QKeyEvent):
print('键盘松开')
app = QApplication(sys.argv)
window = MyWindow()
window.show()
sys.exit(app.exec_())
# 按哪个控件就会执行相应鼠标事件的方法
import sys
from PyQt5.Qt import *
class Window(QWidget):
def mousePressEvent(self, QMouseEvent):
print('顶层窗口鼠标按下')
class midWindow(QWidget):
def mousePressEvent(self, QMouseEvent):
print('中间控件按下')
class Label(QLabel):
def mousePressEvent(self, QMouseEvent):
print('标签控件按下')
app = QApplication(sys.argv)
window = Window()
window.setWindowTitle('事件转发')
window.resize(500, 500)
mid_window = midWindow(window)
mid_window.resize(300, 300)
mid_window.setAttribute(Qt.WA_StyledBackground, True)
mid_window.setStyleSheet('background-color: yellow;')
label = Label(mid_window)
label.setText('Label!!!')
label.move(100, 100)
label.setStyleSheet('background-color: red;')
window.show()
sys.exit(app.exec_())
如果将label中的鼠标按下事件的方法删除,按下鼠标,则会将该事件消息传递给父控件mid_window,并执行mid_window中的鼠标事件方法。
两个特殊方法:
class Label(QLabel):
def mousePressEvent(self, QMouseEvent):
print('标签控件按下')
QMouseEvent.accepted() # 接收了事件,不用往父控件传递了
# 此时会输出:标签控件按下
# QMouseEvent.ignored() # 忽略了事件,继续往父控件传递。
# 此时会输出:标签控件按下 中间控件按下
案例1.
import sys
from PyQt5.Qt import *
class MyLabel(QLabel):
def enterEvent(self, *args, **kwargs):
print("鼠标进入")
self.setText("欢迎光临")
def leaveEvent(self, *args, **kwargs):
print("鼠标离开")
self.setText("谢谢惠顾")
app = QApplication(sys.argv)
window = QWidget()
window.setWindowTitle("案例1")
window.resize(500, 500)
label = MyLabel(window)
label.resize(200, 200)
label.move(100, 100)
label.setStyleSheet("background-color: cyan;")
window.show()
sys.exit(app.exec_())
案例2.
import sys
from PyQt5.Qt import *
class MyLabel(QLabel):
def keyPressEvent(self, evt):
QKeyEvent
print("xx")
# if evt.key() == Qt.Key_Tab:
# print("用户点击了Tab键位")
# 修饰键位 Ctrl 并且 普通键位 s
# if evt.modifiers() == Qt.ControlModifier and evt.key() == Qt.Key_S:
# print("ctrl + Shift + A被点击了")
if evt.modifiers() == Qt.ControlModifier | Qt.ShiftModifier and evt.key() ==
Qt.Key_A:
print("Ctrl + Shift + A被点击了")
app = QApplication(sys.argv)
window = QWidget()
window.setWindowTitle("案例2")
window.resize(500, 500)
label = MyLabel(window)
label.resize(200, 200)
label.move(100, 100)
label.setStyleSheet("background-color: cyan;")
label.grabKeyboard()
window.show()
sys.exit(app.exec_())