的QTabWidget选项卡的颜色变化 [英] Change color of QTabWidget tab's

问题描述

我要定制一个QTabWidget，让每一个标签都有它自己的背景颜色。我知道，这不能用样式表来完成，所以我子类QTabBar，改变它的paintEvent。然后，我取代QTabWidget的默认QTabBar用我自己的实现。然而，翼片的背景颜色不发生变化。有谁知道我缺少的是什么？

I want to customize a QTabWidget, so that every tab has it's own background color. I know, that this cannot be done with stylesheets, so I subclassed QTabBar and changed it's paintEvent. Then, I replaced the default QTabBar of QTabWidget with my own implementation. However, the background color of the tabs doesn't change. Does anybody know what I am missing?

下面是说明我的问题，一个小演示应用程序：

Here is a small demo application which illustrates my problem:

from PyQt4 import QtGui 

import sys

class coloredTabBar(QtGui.QTabBar):
    def __init__(self, parent = None):
        QtGui.QTabBar.__init__(self, parent)

    def paintEvent(self, event):
        p = QtGui.QStylePainter(self)
        painter = QtGui.QPainter(self)
        for index in range(self.count()): #for all tabs
            tab = QtGui.QStyleOptionTabV3() #create styled tab
            self.initStyleOption(tab, index) #initialize with default values
            #change background color to red
            tab.palette.setColor(QtGui.QPalette.Base, QtGui.QColor(255, 0, 0)) 
            p.drawControl(QtGui.QStyle.CE_TabBarTab, tab) #draw tab


class coloredTabWidget(QtGui.QTabWidget):
    def __init__(self, parent = None):
        QtGui.QTabWidget.__init__(self, parent)

        coloredTabs = coloredTabBar()
        self.setTabBar(coloredTabs) #replace default tabBar with my own implementation

if __name__ == "__main__":     
    app = QtGui.QApplication(sys.argv)

    tabWidget = coloredTabWidget()

    tabWidget.addTab(QtGui.QWidget(), "Hello")
    tabWidget.addTab(QtGui.QWidget(), "World")

    tabWidget.show()

    sys.exit(app.exec_())

亲切的问候

伯恩哈德

推荐答案

您使用了错误的调色板作用。您需要 QPalette.Window ，这是一般的小部件背景色，而不是 QPalette.Base ，这是更专业的元素，如编辑的控件：

You're using the wrong palette role. You need QPalette.Window, which is the general widget background color, rather than QPalette.Base, which is for more specialized elements like edit-controls:

tab.palette.setColor(QtGui.QPalette.Window, QtGui.QColor(255, 0, 0))

然而，你应该知道，以这种方式画的标签将无法在所有的平台上工作。这是因为一些Windows和Mac风格的使用像素图绘制标签的时候，所以不要拿调色板变化考虑进去。看到这个<一个href=\"https://wiki.qt.io/Qt_project_org_faq#Why_does_nothing_happen_when_I_set_the_palette_background_color_on_a_QPushButton_in_some_styles.3F\"相对=nofollow> Qt的常见问题解答更多的细节。

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