更改QTabWidget选项卡的颜色

时间:2014-03-23 19:05:32

标签: colors background pyqt qtabwidget qtabbar

我想自定义QTabWidget,以便每个标签都有自己的背景颜色。我知道,这不能用样式表来完成,所以我将QTabBar子类化并更改了它的paintEvent。然后,我用我自己的实现替换了QTabWidget的默认QTabBar。但是,标签的背景颜色不会改变。有人知道我错过了什么吗?

这是一个小型演示应用程序,它说明了我的问题:

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

哈德

2 个答案:

答案 0 :(得分:1)

您正在使用错误的调色板角色。您需要QPalette.Window,这是常规窗口小部件背景颜色,而不是QPalette.Base,它适用于更专业的元素,如编辑控件:

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

但是,您应该知道以这种方式绘制标签不会在所有平台上运行。这是因为某些Windows和Mac样式在绘制标签时会使用像素图,因此不要考虑调色板更改。有关详细信息,请参阅此Qt FAQ

答案 1 :(得分:1)

好吧,我想我得到了一些东西。这不是最漂亮的事情,但它可以解决问题。

如果有人对如何解决这个问题有更好的了解......请告诉我。

from PyQt4 import QtGui 
from PyQt4 import QtCore

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)
        painter.save()
        for index in range(self.count()): #for all tabs

            tabRect = self.tabRect(index)
            tabRect.adjust(-1, 3, -1, -1) #ajust size of every tab (make it smaller)
            if index == 0: #make first tab red 
                color = QtGui.QColor(255, 0, 0)
            elif index == 1: #make second tab yellow
                color = QtGui.QColor(255, 255, 0)
            else: #make all other tabs blue
                color = QtGui.QColor(0, 0, 255)
            if index == self.currentIndex(): #if it's the selected tab
                color = color.lighter(130) #highlight the selected tab with a 30% lighter color
                tabRect.adjust(0, -3, 0, 1) #increase height of selected tab and remove bottom border


            brush = QtGui.QBrush(color)
            painter.fillRect(tabRect, brush)

            painter.setPen(QtGui.QPen(QtGui.QColor(QtCore.Qt.black))) #black pen (for drawing the text)
            painter.drawText(tabRect, QtCore.Qt.AlignVCenter | QtCore.Qt.AlignHCenter,
                             self.tabText(index))

            painter.setPen(QtGui.QPen(QtGui.QColor(QtCore.Qt.gray))) #gray pen (for drawing the border)
            painter.drawRect(tabRect)
        painter.restore()

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(), "Tab 1")
    tabWidget.addTab(QtGui.QWidget(), "Tab 2")
    tabWidget.addTab(QtGui.QWidget(), "Tab 3")
    tabWidget.addTab(QtGui.QWidget(), "Tab 4")

    tabWidget.show()

    sys.exit(app.exec_())