[PyQt] why is mouseMoveEvent not reached in QMainWindow object

[Brian Kelley]

You need to turn mouse tracking on, it is off by default:

http://doc.trolltech.com/4.6/qwidget.html#mouseTracking-prop

Brian Kelley

On Apr 28, 2010, at 9:37 AM, Christopher M. Nahler wrote:

> I am new to PyQt4 and trying to find my way ... here n the first example 
> code I am successfully trying to display the mouse coordinates in a 
> little app using a QWidget object as main window. Below is another try 
> where I would like to display the mouse coordinates in the status bar of 
> a QMainWindow object. Somehow I cannot reach the mouseMoveEvent 
> function. What am I doing wrong?
> 
> import sys
> from PyQt4.QtCore import *
> from PyQt4.QtGui import *
> 
> class MainWindow(QWidget):
> 
>     def __init__(self, parent=None):
>         super(MainWindow, self).__init__(parent)
> 
>         self.setMouseTracking(True)
>         self.text = QString()
> 
>         self.resize(400, 200)
>         self.move(100, 100)
>         self.setWindowTitle("MouseMoveTest")
>         self.update()
> 
>     def paintEvent(self, event):
>         painter = QPainter(self)
>         painter.drawText(self.rect(), Qt.AlignCenter, self.text)
> 
>     def mouseMoveEvent(self, event):
>         curPos = QCursor.pos()
>         self.text = " mouse @ %d / %d " % (curPos.x(), curPos.y())
>         self.update()
> 
> app = QApplication(sys.argv)
> form = MainWindow()
> form.show()
> app.exec_()
> 
> --------------------------------------
> 
> import sys
> from PyQt4.QtCore import *
> from PyQt4.QtGui import *
> 
> SCREEN_BORDER = 100
> 
> class myLabel(QLabel):
>     def __init__(self, parent=None):
>         super(myLabel, self).__init__(parent)
>         curPos = QCursor.pos()
>         self.setText(" mouse @ %d / %d " % (curPos.x(), curPos.y()))
>         self.update()
> 
>     def paintEvent(self, event):
>         painter = QPainter(self)
>         painter.drawText(self.rect(), Qt.AlignCenter, self.text())
> 
> 
> class MainWindow(QMainWindow):
> 
>     def __init__(self, parent=None):
>         super(MainWindow, self).__init__(parent)
> 
>         self.imageLabel = QLabel()
>         self.setCentralWidget(self.imageLabel)
> 
>         # statusbar
>         status = self.statusBar()
>         status.setSizeGripEnabled(False)
> 
>         # add label for mouse coords in statusbar
>         self.coordsLabel = myLabel()
>         status.addPermanentWidget(self.coordsLabel)
>         status.showMessage("Ready", 5000)
> 
> 
>     def mouseMoveEvent(self, event):
>         curPos = QCursor.pos()
>         print curPos
>         self.coordsLabel.setText(" mouse @ %d / %d " % (curPos.x(), 
> curPos.y()))
>         self.coordsLabel.update()
>         super(MainWindow, self).mouseMoveEvent(event)
> 
> if __name__ == "__main__":
> 
>     import sys
> 
>     # setup application object
>     app = QApplication(sys.argv)
> 
>     # create (parent) main window
>     mainWindow = MainWindow()
>     rect = QApplication.desktop().availableGeometry()
>     mainWindow.setGeometry(rect.x() + SCREEN_BORDER,
>                            rect.y() + SCREEN_BORDER,
>                            rect.width() - 2 * SCREEN_BORDER,
>                            rect.height() - 2 * SCREEN_BORDER)
>     mainWindow.setMinimumSize(900, 700)
> 
> mainWindow.setWindowIcon(QIcon("D:\UDaten\pyqt\chap12\DesignerTest.bmp"))
>     mainWindow.setWindowTitle("DesignerTest")
>     mainWindow.show()
> 
>     # run application object
>     sys.exit(app.exec_())
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