在 QComboBox 中显示项目但不在其弹出列表中 [英] Show item in a QComboBox but not in its popup list

问题描述

我有一些代码可以使用组合框来显示产品列表.我想在组合框中显示选择产品":

I have some code to use a combobox to show a list of products. I would like to show "Select product" in the combobox:

products = ["Select product", "223", "51443" , "7335"]

但我不希望用户能够选择选择产品"项目.我只是想让用户知道这个组合框是用来选择产品的，我不想用 QLabel 来识别它.

but I do not want the user to be able to select the "Select product" item. I just want the user to know what this combobox is used for selecting the product, and I do not wish to use QLabel to identify it.

page.comboBox.addItems(products)
page.comboBox.setPlaceHolderText("Please select")
page.comboBox.setGeometry(150, 30, 105, 40)

推荐答案

弹出列表中的项目可以这样隐藏:

An item in the popup list can be hidden like this:

self.combo.view().setRowHidden(0, True)

但是，这仍然允许使用键盘或鼠标滚轮选择隐藏的项目.为了防止这种情况，可以在连接到 activated 信号的插槽中禁用隐藏项目.这意味着一旦做出了有效的选择，该消息将不再显示.要恢复它(例如在重置表单时)，只需重新启用该项目即可.

However, this still allows the hidden item to be selected using the keyboard or mouse-wheel. To prevent this, the hidden item can be disabled in a slot connected to the activated signal. This means that once a valid choice has been made, the message is never shown again. To get it back (e.g. when resetting the form), the item can simply be re-enabled.

这是一个实现所有这些的基本演示:

Here is a basic demo that implements all that:

import sys
from PyQt5 import QtCore, QtWidgets

class Window(QtWidgets.QWidget):
    def __init__(self):
        super(Window, self).__init__()
        self.button = QtWidgets.QPushButton('Reset')
        self.button.clicked.connect(self.handleReset)
        self.combo = QtWidgets.QComboBox()
        layout = QtWidgets.QHBoxLayout(self)
        layout.addWidget(self.combo)
        layout.addWidget(self.button)
        products = ['Select product', '223', '51443' , '7335']
        self.combo.addItems(products)
        self.combo.view().setRowHidden(0, True)
        self.combo.activated.connect(self.showComboMessage)

    def showComboMessage(self, index=-1, enable=False):
        if index:
            self.combo.model().item(0).setEnabled(enable)

    def handleReset(self):
        self.showComboMessage(enable=True)
        self.combo.setCurrentIndex(0)

if __name__ == '__main__':

    app = QtWidgets.QApplication(sys.argv)
    window = Window()
    window.setWindowTitle('Combo Demo')
    window.setGeometry(600, 100, 100, 75)
    window.show()
    sys.exit(app.exec_())

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