我正在使用PyQt5创建应用程序。该应用程序具有一个带有多个小部件的MainWindow。小部件之一是显示视频的QLabel对象。当我单击单选按钮时,当我将鼠标悬停在视频上时,我想跟踪光标并显示光标坐标。
我创建了一个MouseTracking类,并将QLabel对象作为window
传递给它。我已通过打印其几何图形来验证已传递给该类。但是我不知道如何将鼠标跟踪与window
相关联。这是MouseTracking类的代码。我在做什么错?
class MouseTracker(QLabel):
def __init__(self, window):
super().__init__(window)
self.window = window
self.window.setMouseTracking(True)
self.initUI()
def initUI(self):
self.label = QLabel(self)
self.label.setAlignment(Qt.AlignCenter)
self.label.setStyleSheet('background-color: white; border: 1px solid black')
self.show()
def mouseMoveEvent(self, event):
x = event.x()
y = event.y()
print("X, Y = ", x, y)
self.label.setGeometry(x+30, y-15, 90, 40)
self.label.setText('(%d, %d)' % (x, y))
在您的代码中,您启用了“窗口”的mouseTracking属性,但是您正在监视MouseTracker的mouseMoveEvent方法,这是不正确的。如果要跟踪小部件的事件而不覆盖任何方法,则必须使用事件过滤器。
在下面的示例中,我尝试根据您的描述实施您的应用程序,例如绿色的QLabel代表视频显示的QLabel。考虑到上述情况,解决方案如下:
from PyQt5 import QtCore, QtGui, QtWidgets
class MouseTracker(QtCore.QObject):
positionChanged = QtCore.pyqtSignal(QtCore.QPoint)
def __init__(self, widget):
super().__init__(widget)
self._widget = widget
self.widget.setMouseTracking(True)
self.widget.installEventFilter(self)
@property
def widget(self):
return self._widget
def eventFilter(self, o, e):
if o is self.widget and e.type() == QtCore.QEvent.MouseMove:
self.positionChanged.emit(e.pos())
return super().eventFilter(o, e)
class MainWindow(QtWidgets.QMainWindow):
def __init__(self, parent=None):
super().__init__(parent)
central_widget = QtWidgets.QWidget()
self.setCentralWidget(central_widget)
self.video_label = QtWidgets.QLabel()
self.video_label.setStyleSheet("background-color: green; border: 1px solid black")
tracker = MouseTracker(self.video_label)
tracker.positionChanged.connect(self.on_positionChanged)
lay = QtWidgets.QVBoxLayout(central_widget)
lay.addWidget(self.video_label)
lay.addWidget(QtWidgets.QLabel())
self.resize(640, 480)
self.label_position = QtWidgets.QLabel(
self.video_label, alignment=QtCore.Qt.AlignCenter
)
self.label_position.setStyleSheet('background-color: white; border: 1px solid black')
@QtCore.pyqtSlot(QtCore.QPoint)
def on_positionChanged(self, pos):
delta = QtCore.QPoint(30, -15)
self.label_position.show()
self.label_position.move(pos + delta)
self.label_position.setText("(%d, %d)" % (pos.x(), pos.y()))
self.label_position.adjustSize()
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
w = MainWindow()
w.show()
sys.exit(app.exec_())