在 PyQt 中更改 ComboBox 的背景颜色

Change background color of ComboBox in PyQt

我正在尝试更改组合框背景的颜色。我希望它是白色的,但我不能让它有任何不同于灰色的颜色。上图是我得到的,下图是我要的。

这是我的代码:

from PyQt5 import QtWidgets, QtGui

class combodemo(QtWidgets.QWidget):
   def __init__(self, parent = None):
      super(combodemo, self).__init__(parent)

      layout = QtWidgets.QHBoxLayout()
      self.cb = QtWidgets.QComboBox()
      self.cb.addItem("1")
      self.cb.addItem("2")
      pal = self.cb.palette()
      pal.setColor(self.cb.backgroundRole(),QtGui.QColor(255,255,255))
      self.cb.setPalette(pal)
      self.cb.setAutoFillBackground(True)

      layout.addWidget(self.cb)
      self.setLayout(layout)

if __name__ == '__main__':
   app = QtWidgets.QApplication([])
   ex = combodemo()
   ex.show()
   app.exec_()

您必须更改 QPalette::Button 角色的颜色:

from PyQt5 import QtWidgets, QtGui

class combodemo(QtWidgets.QWidget):
    def __init__(self, parent = None):
        super(combodemo, self).__init__(parent)

        layout = QtWidgets.QHBoxLayout(self)

        self.cb = QtWidgets.QComboBox()
        self.cb.addItems(["1", "2"])

        pal = self.cb.palette()
        pal.setColor(QtGui.QPalette.Button, QtGui.QColor(255,255,255))
        self.cb.setPalette(pal)

        layout.addWidget(self.cb)


if __name__ == '__main__':
    import sys

    app = QtWidgets.QApplication(sys.argv)
    ex = combodemo()
    ex.show()
    sys.exit(app.exec_())

在Windows你需要:

app.setStyle("fusion")

为了避免更改整个应用程序的样式,我根据 使用了样式 sheet。

请注意,如 post 中所述,此样式 "the whole drop-down to mimic the native look, but it's not nice to do and not robust (and not portable)." 但是,由于更改应用程序的样式具有更大的影响,因此此方法适用于我的目的。

这是我的风格 sheet:

QComboBox QAbstractItemView {
  border: 1px solid grey;
  background: white;
  selection-background-color: blue;
}
QComboBox {
  background: red;
}

和代码:

from PyQt5 import QtWidgets, QtGui

class combodemo(QtWidgets.QWidget):
   def __init__(self, parent = None):
      super(combodemo, self).__init__(parent)

      layout = QtWidgets.QHBoxLayout()
      self.cb = QtWidgets.QComboBox()
      self.cb.addItem("1")
      self.cb.addItem("2")

      cbstyle =  "QComboBox QAbstractItemView {"
      cbstyle += " border: 1px solid grey;"
      cbstyle += " background: white;"
      cbstyle += " selection-background-color: blue;"
      cbstyle += " }"
      cbstyle += " QComboBox {"
      cbstyle += " background: white;"
      cbstyle += "}"
      self.cb.setStyleSheet(cbstyle)

      layout.addWidget(self.cb)
      self.setLayout(layout)

if __name__ == '__main__':
   app = QtWidgets.QApplication([])
   ex = combodemo()
   ex.show()
   app.exec_()