QGraphicsItem always selected

[prashant]

Hi,

This is related to PyQt and I am kind of beginner here.

To show a that particular QGraphicsItem is selected you have to set a property:

self.setFlag(QtGui.QGraphicsItem.ItemIsSelectable)

self.setFlag(QtGui.QGraphicsItem.ItemIsSelectable)

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and in "paint" event, you can draw something to show that item has been selected.

def paint(self, painter, option, widget):
    if option.state and QtGui.QStyle.State_Selected:
            painter.setPen(QtCore.Qt.green)

def paint(self, painter, option, widget):
    if option.state and QtGui.QStyle.State_Selected:
            painter.setPen(QtCore.Qt.green)

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It looks pretty easy but it is not working as it has to. To confirm that I did some changes in the example graphicsview>elasticnodes.pyw that comes with PyQt and eventually I encountered the same problem there also.

First change is to add property:

self.setFlag(QtGui.QGraphicsItem.ItemIsSelectable)

self.setFlag(QtGui.QGraphicsItem.ItemIsSelectable)

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and second change is to draw something is paint event:

if option.state and QtGui.QStyle.State_Selected:
            painter.setPen(QtCore.Qt.green)
            painter.setBrush(QtCore.Qt.NoBrush)
            painter.drawRect(0,0, 10, 10)

if option.state and QtGui.QStyle.State_Selected:
            painter.setPen(QtCore.Qt.green)
            painter.setBrush(QtCore.Qt.NoBrush)
            painter.drawRect(0,0, 10, 10)

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and resulting image is:


As you can see there are small green color rectangles on every node.

Is it a bug? Is there any property of QGraphicsView that needs to be set/unset to resolve this problem?

Cheers

Prashant

Python 2.5.2
PyQt-Py2.5-gpl-4.4.3-1
Win XP, 32 Bit

[wysota]

Is "and" a bitwise or a bytewise operator in Python? By quickly inspecting Python docs it seems you should use "&" instead of "and".

[prashant]

Thanks......