python - 在 QWidget 中使用 PyQt4.QtGui.QMouseEvent

Question

我使用 PyQt4.QMainWindow 作为我的应用程序界面，我想在 QWidget 中获取鼠标的 x 和 y 坐标，并在 MainWindow 的 2 个 textBrowsers 中连续设置它们。

QWidget 的文档在这里。

QMouseEvent 的文档在这里。

这是代码

from PyQt4 import QtGui
from PyQt4.QtGui import QApplication
import sys

class Ui_MainWindow(object):
   def setupUI(self, MainWindow):
      self.textBrowser_1 = QtGui.QTextBrowser(self.tab)
      self.textBrowser_2 = QtGui.QTextBrowser(self.tab)
      self.widget_1 = QtGui.QWidget(self.tab)
      self.widget_1.setMouseTracking(True)

class MyMainScreen(QMainWindow):
def __init__(self, parent=None):
    QtGui.QMainWindow.__init__(self, parent)
    self.ui = Ui_MainWindow()   # This is from a python export from QtDesigner
    #   There is a QWidget inside that is self.ui.widget_1
    #   and 2 textBrowsers, textBrowser_1 and textBrowser_2
    #   I want to populate these 2 textBrowsers with the current x,y 
    #   coordinates.

if __name__ == "__main__":
    app = QApplication(sys.argv)
    mainscreen = MyMainScreen()           
    mainscreen.show()
    app.exec_()

Answer 1

当您应用 setMouseTracking 时，它仅适用于该小部件，而不适用于您的孩子，因此您必须在下一个解决方案中手动：

def setMouseTracking(self, flag):
    def recursive_set(parent):
        for child in parent.findChildren(QtCore.QWidget):
            child.setMouseTracking(flag)
            recursive_set(child)
    QtGui.QWidget.setMouseTracking(self, flag)
    recursive_set(self)

完整代码：

from PyQt4 import QtCore

from PyQt4 import QtGui
from PyQt4.QtGui import QApplication, QMainWindow
import sys


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.resize(800, 132)
        self.centralwidget = QtGui.QWidget(MainWindow)
        self.horizontalLayout = QtGui.QHBoxLayout(self.centralwidget)
        self.textBrowser_1 = QtGui.QTextBrowser(self.centralwidget)
        self.horizontalLayout.addWidget(self.textBrowser_1)
        self.textBrowser_2 = QtGui.QTextBrowser(self.centralwidget)
        self.horizontalLayout.addWidget(self.textBrowser_2)
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtGui.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 22))
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtGui.QStatusBar(MainWindow)
        MainWindow.setStatusBar(self.statusbar)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)


class MyMainScreen(QMainWindow):
    def __init__(self, parent=None):
        QtGui.QMainWindow.__init__(self, parent)
        self.ui = Ui_MainWindow()  # This is from a python export from QtDesigner
        self.ui.setupUi(self)
        self.setMouseTracking(True)
        self.ui.textBrowser_1.setMouseTracking(True)
        self.ui.textBrowser_2.setMouseTracking(True)
        self.ui.menubar.setMouseTracking(True)
        self.ui.statusbar.setMouseTracking(True)

    def setMouseTracking(self, flag):
        def recursive_set(parent):
            for child in parent.findChildren(QtCore.QWidget):
                child.setMouseTracking(flag)
                recursive_set(child)
        QtGui.QWidget.setMouseTracking(self, flag)
        recursive_set(self)

    def mouseMoveEvent(self, event):
        pos = event.pos()
        self.ui.textBrowser_1.append(str(pos.x()))
        self.ui.textBrowser_2.append(str(pos.y()))
        QtGui.QMainWindow.mouseMoveEvent(self, event)

if __name__ == "__main__":
    app = QApplication(sys.argv)
    mainscreen = MyMainScreen()
    mainscreen.show()
    app.exec_()

这是我的输出：