Hi,
i have problem with setting QTreeWidget QPalette. If i set alpha channel for 
QTreeWidget, then alpha channel is setted for all mainwindow too. What is 
bad?

This is the test source code. I'm using PyQt-x11-gpl-4.1.1 and qt4.2.1-2

try:
        from PyQt4 import QtCore, QtGui
except:
        print "PyQt4 is not installed."
import sys

class mainWindow(QtGui.QMainWindow):
        def __init__(self,parent=None):
                apply(QtGui.QMainWindow.__init__,(self,parent))
                # central widget
                self.setCentralWidget(QtGui.QWidget(self))
                # layout
                layout=QtGui.QVBoxLayout(self.centralWidget())
                # we will see palette color change on this widget
                self.lineEdit=QtGui.QLineEdit(self)
                layout.addWidget(self.lineEdit)
                # we will change palette of this tree widget
                self.treeWidget=treeWidget(self)
                layout.addWidget(self.treeWidget)

class treeWidget(QtGui.QTreeWidget):
        def __init__(self,parent=None):
                apply(QtGui.QTreeWidget.__init__,(self,parent))
                # if we set alpha channel then alpha channel will not set only 
for tree 
widget
                # but for mainWindow.lineEdit too.
                palette=QtGui.QPalette()
                color=palette.color(QtGui.QPalette.Base)
                color.setAlpha(50) # for example 50
                palette.setColor(QtGui.QPalette.Base,color)
                self.setPalette(palette)
                
                # i tried this too
                #palette=self.viewport().palette()
                #color=palette.color(QtGui.QPalette.Base)
                #color.setAlpha(50) # for example 50
                #palette.setColor(QtGui.QPalette.Base,color)
                #self.viewport().setPalette(palette)

app = QtGui.QApplication(sys.argv)
win = mainWindow()
win.show()
sys.exit(app.exec_())

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