Signal
destroyed
objectNameChanged
Function
事件处理
event(self, event): 事件处理函数，用于处理所有发送到该对象的事件。installEventFilter(self, filterObj): 安装事件过滤器到该对象。removeEventFilter(self, filterObj): 移除之前安装的事件过滤器。
import sys
from PySide6.QtWidgets import QApplication, QPushButton, QMainWindow, QLabel
from PySide6.QtCore import QObject, QEvent
class EventFilter(QObject):
def eventFilter(self, obj, event):
# 当按钮被点击时
if event.type() == QEvent.MouseButtonPress:
print("Button clicked - event filter")
return True
return False
class MyWindow(QMainWindow):
def __init__(self):
super().__init__()
# 创建按钮
self.button = QPushButton("Click me", self)
self.button.setGeometry(50,50, 100, 50)
self.button.pressed.connect(lambda:print("!"))
self.button1 = QPushButton("change mode", self)
self.button1.setGeometry(200,50, 100, 50)
self.button1.pressed.connect(self.change)
# 创建事件过滤器并安装
self.filter = EventFilter()
self.button.installEventFilter(self.filter)
self.installed=True
self.label = QLabel("Event label", self)
self.label.setGeometry(100, 150, 200, 30)
def event(self, event):
# 处理窗口本身的事件
if event.type() == QEvent.MouseButtonPress:
self.label.setText("Window clicked")
return True
return super().event(event)
def change(self,):
if self.installed:
self.button.removeEventFilter(self.filter)
self.installed=False
else:
self.button.installEventFilter(self.filter)
self.installed=True
if __name__=='__main__':
app = QApplication(sys.argv)
window = MyWindow()
window.show()
sys.exit(app.exec())对象属性和元对象系统
setProperty(self, name, value): 设置对象的属性。property(self, name): 获取对象的属性。objectName(self): 获取对象的名称。setObjectName(self, name): 设置对象的名称。metaObject(self): 获取对象的元对象信息，包含信号、槽、属性等信息。
import sys
from PySide6.QtWidgets import QApplication, QMainWindow, QPushButton, QLabel
class MyWindow(QMainWindow):
def __init__(self):
super().__init__()
# 设置窗口的名称
self.setObjectName("MainWindow")
# 创建一个按钮，并设置一些属性
self.button = QPushButton("Click me", self)
self.button.setObjectName("MyButton")
self.button.setProperty("type", "pushbutton")
self.button.setGeometry(50, 50, 100, 30)
# 创建一个标签来显示信息
self.label = QLabel("", self)
self.label.setGeometry(50, 100, 300, 50)
button_type = self.button.property("type")
button_name = self.button.objectName()
meta_obj = self.button.metaObject().className()
self.label.setText(f"Button Name: {button_name}\n"
f"Button Type: {button_type}\n"
f"Meta Object Class: {meta_obj}")
# 连接按钮的信号
self.button.clicked.connect(self.on_button_clicked)
def on_button_clicked(self):
# 获取按钮的属性并显示在标签上
self.label.setObjectName('test')
self.label.setProperty('name', 'test1')
print(self.label.property('name'),self.label.objectName())
app = QApplication(sys.argv)
window = MyWindow()
window.show()
sys.exit(app.exec())对象的父子关系
parent(self): 返回对象的父对象。setParent(self, parent): 设置对象的父对象。findChild(self, type, name): 查找满足条件的第一个子对象。findChildren(self, type, name): 查找所有符合条件的子对象。children(self): 返回对象的直接子对象列表。deleteLater(self): 将对象标记为删除，当控制权返回到事件循环时，对象将被删除。inherits(self, className): 检查对象是否继承自指定的类。isWidgetType(self): 判断该对象是否是一个小部件。isWindowType(self): 判断该对象是否是一个窗口。
import sys
from PySide6.QtWidgets import QApplication, QMainWindow, QPushButton
import pprint
class MyWindow(QMainWindow):
def __init__(self):
super().__init__()
self.setObjectName("MainWindow")
# 创建一个按钮，并设置一些属性
self.button = QPushButton("Click me")
self.button.setParent(self)
self.button.objectNameChanged.connect(lambda:print("name chageed"))
self.button.setObjectName("MyButton")
self.button.setProperty("type", "pushbutton")
self.button.setGeometry(50, 50, 100, 30)
print(
self.button.isWidgetType(),
self.button.isWindowType(),
self.isWindowType(),
)
pprint.pprint([self.button.parent(),
self.findChild(QPushButton),
self.children()])
# 连接按钮的信号
self.button.clicked.connect(self.on_button_clicked)
self.button.destroyed.connect(lambda:print("delete!!"))
def on_button_clicked(self):
self.button.deleteLater()
app = QApplication(sys.argv)
window = MyWindow()
window.show()
sys.exit(app.exec())信号的连接和阻隔、计时器
blockSignals(self, bool):临时阻止/允许对象发出信号。返回之前的阻止状态
connectNotify(self, QMetaMethod):当一个新的信号连接到对象的槽时调用
timerEvent(self, QTimerEvent):处理计时器事件
startTimer(self, int interval, Qt.TimerType timerType=Qt.PreciseTimer):启动一个计时器
signalsBlocked(self):检查对象是否阻止了信号
import sys
from PySide6.QtCore import QObject, Signal
from PySide6.QtWidgets import QApplication, QMainWindow, QPushButton
class CustomObject(QObject):
customSignal = Signal()
def __init__(self):
super().__init__()
self.timer_id = self.startTimer(2000) # 启动计时器，每两秒触发一次
def timerEvent(self, event):
print("trigger1")
if event.timerId() == self.timer_id:
self.customSignal.emit()
def connectNotify(self, signal):
print(f"Signal '{signal.name()}' connected")
class MyWindow(QMainWindow):
def __init__(self):
super().__init__()
self.obj = CustomObject()
self.button = QPushButton("Block/dis Signal", self)
self.button.clicked.connect(self.emit_signal)
self.button.move(50, 20)
self.button = QPushButton("connect/dis", self)
self.button.clicked.connect(self.reverse_signal)
self.button.move(50, 50)
self.obj.customSignal.connect(self.test)
self.connect=True
def emit_signal(self):
block_status = not self.obj.signalsBlocked()
self.obj.blockSignals(block_status)
print(f"Signals blocked: {self.obj.signalsBlocked()}")
def reverse_signal(self):
if self.connect:
self.obj.customSignal.disconnect(self.test)
else:
self.obj.customSignal.connect(self.test)
self.connect = not self.connect
def test(self):
print("trigger2")
app = QApplication(sys.argv)
window = MyWindow()
window.show()
sys.exit(app.exec())Qthread
moveToThread(self, thread: PySide6.QtCore.QThread):
把对象从一个线程移动到另一个线程
thread（self）返回线程的地址
import sys
from PySide6.QtCore import QObject, QThread, Signal, Slot
from PySide6.QtWidgets import QApplication, QMainWindow, QPushButton, QVBoxLayout, QWidget, QLabel
import time
class Worker(QObject):
finished = Signal()
progress = Signal(int)
def run(self):
for i in range(0, 5):
time.sleep(0.5) # 模拟长时间运行的任务
self.progress.emit(i + 1)
self.finished.emit()
class MyWindow(QMainWindow):
def __init__(self):
super().__init__()
self.central_widget = QWidget()
self.layout = QVBoxLayout(self.central_widget)
self.setCentralWidget(self.central_widget)
self.label = QLabel("Task not started", self)
self.layout.addWidget(self.label)
self.button = QPushButton("Start Task", self)
self.button.clicked.connect(self.startTask)
self.layout.addWidget(self.button)
self.worker = Worker()
self.thread = QThread()
self.worker.moveToThread(self.thread)
print(self.worker.thread(),self.thread)
self.worker.finished.connect(self.thread.quit)
#self.worker.finished.connect(self.worker.deleteLater)
#self.thread.finished.connect(self.thread.deleteLater)
self.worker.progress.connect(self.reportProgress)
def startTask(self):
self.worker.finished.connect(self.taskFinished)
self.thread.started.connect(self.worker.run)
self.thread.start()
self.button.setEnabled(False)
@Slot()
def reportProgress(self, n):
self.label.setText(f"Progress: {n}")
@Slot()
def taskFinished(self):
self.label.setText("Task finished!")
self.button.setEnabled(True)
app = QApplication(sys.argv)
window = MyWindow()
window.show()
sys.exit(app.exec())