Pyqt5 label滚动

可以使用QLabel和QTimer来实现滚动效果。以下是一个示例代码：

from PyQt5.QtCore import Qt, QTimer
from PyQt5.QtGui import QFontMetrics
from PyQt5.QtWidgets import QLabel

class ScrollingLabel(QLabel):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.setAlignment(Qt.AlignLeft | Qt.AlignVCenter)
        self.setWordWrap(False)
        self.timer = QTimer(self)
        self.timer.timeout.connect(self.scroll)
        self.offset = 0

    def setText(self, text):
        super().setText(text)
        fm = QFontMetrics(self.font())
        self.textWidth = fm.width(text)
        self.offset = 0

    def startScroll(self, speed=50):
        self.timer.start(speed)

    def stopScroll(self):
        self.timer.stop()

    def scroll(self):
        self.offset -= 1
        if -self.offset >= self.textWidth:
            self.offset = self.width()
        self.update()

    def paintEvent(self, event):
        painter = self.painter()
        clip = event.rect()
        painter.setClipRect(clip)
        painter.translate(self.offset, 0)
        super().paintEvent(event)
        if self.offset < 0:
            painter.translate(self.textWidth, 0)
            super().paintEvent(event)

使用示例：

from PyQt5.QtWidgets import QApplication, QWidget, QVBoxLayout
app = QApplication([])
window = QWidget()
layout = QVBoxLayout()
label = ScrollingLabel()
label.setText("Hello, World! This is a scrolling label.")
label.startScroll(50) # 设置滚动速度
layout.addWidget(label)
window.setLayout(layout)
window.show()
app.exec_()

这样就可以在窗口中创建一个可以滚动的QLabel了。