PyQt:如何将组合框项设置为可检查? [英] PyQt: How to set Combobox Items be Checkable?

问题描述

为了将 GUI 小部件数量保持在最低限度，我需要找到一种方法让用户可以选择下拉菜单项，这些菜单项可用于过滤掉 listWidget 项中显示的项.假设 listWidget 列出了 5 个不同类别的项目:Cat A"、Cat B"、Cat C"、Cat D"、Cat E".我可以为每个项目类别实现单选框或复选框.但是 5 个单选按钮或复选框会占用大量 GUI 空间.带有可检查项目的组合框似乎是一个正确的选择.有什么想法吗?

To keep the GUI widgets number to minimum I need to find a way to give to user a choice of pull-down menu items that could be used to filter out the displayed in a listWidget items. Let's say the listWidget lists 5 different categories of Items: "Cat A", "Cat B","Cat C","Cat D","Cat E". I could implement the radio or checkboxes for each item category. But then 5 radio buttons or checkboxes would take a lot of GUI space. A combobox with the checkable items seems to be a right choice. Any ideas?

from PyQt4 import QtGui, QtCore
import sys, os


class CheckableComboBox(QtGui.QComboBox):
    def __init__(self):    
        super(CheckableComboBox, self).__init__()

    def flags(self, index):
        return Qt.ItemIsUserCheckable | Qt.ItemIsSelectable | Qt.ItemIsEnabled


class Dialog_01(QtGui.QMainWindow):
    def __init__(self):
        super(QtGui.QMainWindow,self).__init__()

        myQWidget = QtGui.QWidget()
        myBoxLayout = QtGui.QVBoxLayout()
        myQWidget.setLayout(myBoxLayout)
        self.setCentralWidget(myQWidget)

        self.ComboBox = CheckableComboBox()
        for i in range(3):
            self.ComboBox.addItem("Combobox Item " + str(i))

        myBoxLayout.addWidget(self.ComboBox)


if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)
    dialog_1 = Dialog_01()
    dialog_1.show()
    dialog_1.resize(480,320)
    sys.exit(app.exec_())

推荐答案

这个多选组合的想法在之前出现过，但我不确定它是最好的解决方案.实际上，所需要的只是一个带有下拉菜单的工具按钮(类似于网络浏览器中的历史记录按钮).

This idea of a multi-select combo has come up before, but I'm not sure that its the best solution. Really, all that's needed is a tool-button with a drop-down menu (similar to the history buttons in a web-browser).

这是说明这两个选项的示例的更新:

Here's an update of the example that illustrates both options:

from PyQt4 import QtGui, QtCore
import sys, os

class CheckableComboBox(QtGui.QComboBox):
    def __init__(self):
        super(CheckableComboBox, self).__init__()
        self.view().pressed.connect(self.handleItemPressed)
        self.setModel(QtGui.QStandardItemModel(self))

    def handleItemPressed(self, index):
        item = self.model().itemFromIndex(index)
        if item.checkState() == QtCore.Qt.Checked:
            item.setCheckState(QtCore.Qt.Unchecked)
        else:
            item.setCheckState(QtCore.Qt.Checked)

class Dialog_01(QtGui.QMainWindow):
    def __init__(self):
        super(QtGui.QMainWindow,self).__init__()
        myQWidget = QtGui.QWidget()
        myBoxLayout = QtGui.QVBoxLayout()
        myQWidget.setLayout(myBoxLayout)
        self.setCentralWidget(myQWidget)
        self.ComboBox = CheckableComboBox()
        for i in range(3):
            self.ComboBox.addItem("Combobox Item " + str(i))
            item = self.ComboBox.model().item(i, 0)
            item.setCheckState(QtCore.Qt.Unchecked)
        self.toolbutton = QtGui.QToolButton(self)
        self.toolbutton.setText('Select Categories ')
        self.toolmenu = QtGui.QMenu(self)
        for i in range(3):
            action = self.toolmenu.addAction("Category " + str(i))
            action.setCheckable(True)
        self.toolbutton.setMenu(self.toolmenu)
        self.toolbutton.setPopupMode(QtGui.QToolButton.InstantPopup)
        myBoxLayout.addWidget(self.toolbutton)
        myBoxLayout.addWidget(self.ComboBox)

if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)
    dialog_1 = Dialog_01()
    dialog_1.show()
    dialog_1.resize(480,320)
    sys.exit(app.exec_())

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