python-QListView中的复选框选择 [英] python - checkbox selection in QListView

问题描述

因此，我开发了一个带有复选框的简单对话框，该对话框允许用户从列表中选择一个或多个项目.除了标准的确定"和取消"按钮外，它还添加了全选"和取消全选"按钮，使用户可以一次检查/取消选中所有项目(这对于大型列表而言非常方便).

So, I developed a simple dialog with a checkbox, which allows the user to select one or several items from a list. Besides the standard OK and Cancel buttons, it adds Select All and Unselect All buttons, allowing the user to check/uncheck all items at once (this comes handy for large lists).

import os, sys
from PyQt4 import Qt, QtCore, QtGui

class ChecklistDialog(QtGui.QDialog):
    def __init__(self, name, stringlist=None, checked=False, icon=None, parent=None):
        super(ChecklistDialog, self).__init__(parent)

        self.name = name
        self.icon = icon
        self.model = QtGui.QStandardItemModel()
        self.listView = QtGui.QListView()

        if stringlist is not None:
            for i in range(len(stringlist)):
                item = QtGui.QStandardItem(stringlist[i])
                item.setCheckable(True)
                check = QtCore.Qt.Checked if checked else QtCore.Qt.Unchecked
                item.setCheckState(check)
                self.model.appendRow(item)

        self.listView.setModel(self.model)

        self.okButton = QtGui.QPushButton("OK")
        self.cancelButton = QtGui.QPushButton("Cancel")
        self.selectButton = QtGui.QPushButton("Select All")
        self.unselectButton = QtGui.QPushButton("Unselect All")

        hbox = QtGui.QHBoxLayout()
        hbox.addStretch(1)
        hbox.addWidget(self.okButton)
        hbox.addWidget(self.cancelButton)
        hbox.addWidget(self.selectButton)
        hbox.addWidget(self.unselectButton)

        vbox = QtGui.QVBoxLayout()
        vbox.addWidget(self.listView)
        vbox.addStretch(1)
        vbox.addLayout(hbox)

        self.setLayout(vbox)    
        #self.setLayout(layout)
        self.setWindowTitle(self.name)
        if self.icon is not None: self.setWindowIcon(self.icon)

        self.okButton.clicked.connect(self.accept)
        self.cancelButton.clicked.connect(self.reject)
        self.selectButton.clicked.connect(self.select)
        self.unselectButton.clicked.connect(self.unselect)

    def reject(self):
        QtGui.QDialog.reject(self)

    def accept(self):
        self.choices = []
        i = 0
        while self.model.item(i):
            if self.model.item(i).checkState():
                self.choices.append(self.model.item(i).text())
            i += 1
        QtGui.QDialog.accept(self)

    def select(self):
        i = 0
        while self.model.item(i):
            item = self.model.item(i)
            if not item.checkState():
                item.setCheckState(True)
            i += 1

    def unselect(self):
        i = 0
        while self.model.item(i):
            item = self.model.item(i)
            item.setCheckState(False)
            i += 1  

if __name__ == "__main__":
    fruits = ["Banana", "Apple", "Elderberry", "Clementine", "Fig",
        "Guava", "Mango", "Honeydew Melon", "Date", "Watermelon",
        "Tangerine", "Ugli Fruit", "Juniperberry", "Kiwi", "Lemon",
        "Nectarine", "Plum", "Raspberry", "Strawberry", "Orange"]
    app = QtGui.QApplication(sys.argv)
    form = ChecklistDialog("Fruit", fruits, checked=True)
    if form.exec_():
        print("\n".join([str(s) for s in form.choices]))

上面的代码有效，但是我为QListView的奇怪行为所困扰:当对话框显示时，如果将"check"参数设置为True，则所有选中的复选框都会带有"X"标记(如预期的那样).但是，当单击全选"按钮时，复选框将变为灰色(尽管已正确选择了项目).我希望它们以"X"标记显示，以便向用户呈现一致的外观.

The above code works, but I am bothered by the strange behaviour of QListView: when the dialog is display with the "check" parameter turned to True, all checkbozes appear selected with an "X" mark (as expected). However, when the Select All button is clicked, the checkboxes are instead grayed (although the items are correctly selected). I would prefer that they be displayed with an "X" mark, in order to present a consistent appearence to the user.

请参见下图.

总的来说，我的问题是:如何控制复选框在QListView中的显示方式?

In general terms, my question is: how to control the way the checkboxes are displayed in a QListView?

推荐答案

导致此问题的原因是QCheckBox的rel ="nofollow noreferrer">状态为3:

The problem is caused because the states of a QCheckBox are 3:

Qt ::未选中 0该项未选中.

Qt::Unchecked 0 The item is unchecked.

Qt :: PartiallyChecked 1该项目已部分检查.中的项目 可以部分检查分层模型中是否有部分(但不是全部) 他们的孩子被检查了.

Qt::PartiallyChecked 1 The item is partially checked. Items in hierarchical models may be partially checked if some, but not all, of their children are checked.

Qt :: Checked 2已选中该项目.

正如您所看到的，它们是整数值，当您传递True的值时，该值将转换为1，这等于Qt::PartiallyChecked的值，您会得到矩形而不是十字.

And as you see they are integer values, and when you pass the value of True this is converted to 1 which is equivalent to Qt::PartiallyChecked by those you get the rectangle instead of the cross.

解决方案是为其传递正确的值:QtCore.Qt.Checked如下所示:

The solution is to pass it the correct value: QtCore.Qt.Checked as I show below:

import sys
from PyQt4 import Qt, QtCore, QtGui


class ChecklistDialog(QtGui.QDialog):

    def __init__(
        self,
        name,
        stringlist=None,
        checked=False,
        icon=None,
        parent=None,
        ):
        super(ChecklistDialog, self).__init__(parent)

        self.name = name
        self.icon = icon
        self.model = QtGui.QStandardItemModel()
        self.listView = QtGui.QListView()

        for string in stringlist:
            item = QtGui.QStandardItem(string)
            item.setCheckable(True)
            check = \
                (QtCore.Qt.Checked if checked else QtCore.Qt.Unchecked)
            item.setCheckState(check)
            self.model.appendRow(item)

        self.listView.setModel(self.model)

        self.okButton = QtGui.QPushButton('OK')
        self.cancelButton = QtGui.QPushButton('Cancel')
        self.selectButton = QtGui.QPushButton('Select All')
        self.unselectButton = QtGui.QPushButton('Unselect All')

        hbox = QtGui.QHBoxLayout()
        hbox.addStretch(1)
        hbox.addWidget(self.okButton)
        hbox.addWidget(self.cancelButton)
        hbox.addWidget(self.selectButton)
        hbox.addWidget(self.unselectButton)

        vbox = QtGui.QVBoxLayout(self)
        vbox.addWidget(self.listView)
        vbox.addStretch(1)
        vbox.addLayout(hbox)

        self.setWindowTitle(self.name)
        if self.icon:
            self.setWindowIcon(self.icon)

        self.okButton.clicked.connect(self.onAccepted)
        self.cancelButton.clicked.connect(self.reject)
        self.selectButton.clicked.connect(self.select)
        self.unselectButton.clicked.connect(self.unselect)

    def onAccepted(self):
        self.choices = [self.model.item(i).text() for i in
                        range(self.model.rowCount())
                        if self.model.item(i).checkState()
                        == QtCore.Qt.Checked]
        self.accept()

    def select(self):
        for i in range(self.model.rowCount()):
            item = self.model.item(i)
            item.setCheckState(QtCore.Qt.Checked)

    def unselect(self):
        for i in range(self.model.rowCount()):
            item = self.model.item(i)
            item.setCheckState(QtCore.Qt.Unchecked)


if __name__ == '__main__':
    fruits = [
        'Banana',
        'Apple',
        'Elderberry',
        'Clementine',
        'Fig',
        'Guava',
        'Mango',
        'Honeydew Melon',
        'Date',
        'Watermelon',
        'Tangerine',
        'Ugli Fruit',
        'Juniperberry',
        'Kiwi',
        'Lemon',
        'Nectarine',
        'Plum',
        'Raspberry',
        'Strawberry',
        'Orange',
        ]
    app = QtGui.QApplication(sys.argv)
    form = ChecklistDialog('Fruit', fruits, checked=True)
    if form.exec_() == QtGui.QDialog.Accepted:
        print '\n'.join([str(s) for s in form.choices])

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