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List:       pykde
Subject:    Re: [PyQt] why is mouseMoveEvent not reached in QMainWindow object
From:       Brian Kelley <kelley () eyesopen ! com>
Date:       2010-04-29 13:18:50
Message-ID: F536B8BB-4C2F-44C2-9271-6EA95FF82678 () eyesopen ! com
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You need to have a:

def mouseMoveEvent(...)

for each widget, i.e. the mainwindow.mouseMoveEvent doesn't see mouse events from the \
GraphicsView since these are accepted by the graphics view and not propagated.

Briefly looking at your code, I would move the mouseMove function to the GraphicsView \
(you might need to send in the coordinate label to the constructor).

Brian

On Apr 29, 2010, at 8:38 AM, <christopher.nahler@papermodels.at> \
<christopher.nahler@papermodels.at> wrote:

> 
> I have expanded my working code where I replace the central QLabel widget
> with a scene and view. Now the mouse tracking works when the cursor is over
> the status bar and the label in the statusbar but not over the graphics
> view. But when I press the mouse button and move out of the statusbar area
> into the graphics view area the tracking works. Just not when I move the
> mouse without clicking over the view. I am guessing this has to do with the
> rubberbanding? Or have I missed something else?
> 
> The view has setMouseTracking set to True and the scene does not have this
> function. 
> 
> from PyQt4.QtCore import *
> from PyQt4.QtGui import *
> 
> SCREEN_BORDER = 100
> 
> class GraphicsView(QGraphicsView):
> def __init__(self, parent=None):
> super(GraphicsView, self).__init__(parent)
> self.setMouseTracking(True)
> self.setDragMode(QGraphicsView.RubberBandDrag)
> 
> #def wheelEvent(self, event):
> #factor = 1.41 ** (-event.delta() / 240.0)
> #self.scale(factor, factor)
> 
> 
> class MouseCoordinates(QLabel):
> 
> def __init__(self, parent=None):
> super(MouseCoordinates, self).__init__(parent)
> self.setMouseTracking(True)
> self.curPos = None
> self.setText(QString())
> self.update()
> 
> def paintEvent(self, event):
> painter = QPainter(self)
> self.curPos = QCursor.pos()
> self.setText(" mouse @ %d / %d " % (self.curPos.x(),
> self.curPos.y()))
> painter.drawText(self.rect(), Qt.AlignCenter, self.text())
> 
> 
> class MainWindow(QMainWindow):
> 
> def __init__(self, parent=None):
> super(MainWindow, self).__init__(parent)
> self.setMouseTracking(True)
> 
> self.scene = QGraphicsScene(self)
> self.scene.setSceneRect(QRectF(0, 0, 800, 600))
> 
> # draw border
> self.scene.addRect(QRectF(0, 0, 800, 600), 
> QPen(Qt.darkGray, 1, Qt.DotLine),
> QBrush(Qt.lightGray))
> 
> # save the current rect as parent object (canvas) for drawing
> self.background = self.scene.items()[0]
> 
> myObj = QGraphicsRectItem(QRectF(100, 100, 200, 200), parent =
> self.background, scene = self.scene)
> myPen = QPen(Qt.black, 1, Qt.SolidLine)
> myBrush = QBrush(Qt.white, Qt.SolidPattern)
> myObj.setFlag(QGraphicsItem.ItemIsMovable, True)
> myObj.setFlag(QGraphicsItem.ItemIsSelectable, True)
> myObj.setPen(myPen)
> myObj.setBrush(myBrush)
> 
> # add view
> self.view = GraphicsView()
> # self.view.setMouseTracking(True) # set in class already
> self.view.setScene(self.scene)
> self.setCentralWidget(self.view)
> 
> self.coordsLabel = MouseCoordinates()
> #self.coordsLabel.setFrameStyle(QFrame.StyledPanel|QFrame.Sunken)
> status = self.statusBar()
> status.setMouseTracking(True)
> status.setSizeGripEnabled(False)
> status.addPermanentWidget(self.coordsLabel)
> status.showMessage("Ready", 5000)
> 
> 
> def mouseMoveEvent(self, event):
> 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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