如何根据作为输入的列表正确排序 QTreeView 中的列

Question

基本上我显示的是一个有 20 列的 QTreeView。我希望用户 re-arrange 列并按下保存按钮以将排序存储为 ini-file 中的列表。在启动程序时，我想根据 ini-file.

中的设置 re-order 列

我将原始列顺序存储为“list_origin”中的列表。所需的顺序在“list_custom”中。例如

list_origin=['From', 'Subject', 'Date']
list_custom=['Date', 'Subject', 'From']

现在的问题是，当我使用 model headers moveSection() 命令移动列时，原始索引有时不再正确，因为列可能会插入中间并因此失去它们的来源位置索引。

请参见下面的示例：按下“将列重新排列为 Date/Subject/From”按钮将创建不需要的列顺序。如何根据 list_custom?

按所需顺序排列列

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# file: treeView_FindCol.py

import sys
from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
def find_col_by_name(tree_obj, col_name: str) -> int:
    """ Returns found column position as integer, else -1 """
    pos_found: int = -1
    model = tree_obj.model()
    if model:
        for col in range(model.columnCount()):
            header = model.headerData(col, Qt.Horizontal, Qt.DisplayRole)
            if str(header) == col_name:
                pos_found = col
    return pos_found
def find_col_by_index(tree_obj, col_index: int) -> int:
    """ Returns found column position as integer, else -1 """
    pos_found: int = -1
    model = tree_obj.model()
    header = tree_obj.header()

    pos_found = header.visualIndex(col_index)
    header_txt = model.headerData(pos_found, Qt.Horizontal, Qt.DisplayRole)

    return pos_found

class App(QWidget):
    FROM, SUBJECT, DATE = range(3)

    def __init__(self):
        super().__init__()
        self.title = 'PyQt5 Treeview Example - pythonspot.com'
        self.left = 800
        self.top = 200
        self.width = 640
        self.height = 240
        self.initUI()

    def initUI(self):
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.width, self.height)

        pushButton = QPushButton("Rearrange cols to Date/Subject/From")

        groupBox = QGroupBox("Inbox")
        treeView = QTreeView()
        treeView.setRootIsDecorated(False)
        treeView.setAlternatingRowColors(True)

        pushButton.clicked.connect(lambda: self.rearrange_column_layout(treeView))

        dataLayout = QHBoxLayout()
        dataLayout.addWidget(treeView)
        dataLayout.addWidget(pushButton)

        groupBox.setLayout(dataLayout)

        model = self.createMailModel(self)
        treeView.setModel(model)
        self.addMail(model, 'service@github.com', 'Your Github Donation','03/25/2017 02:05 PM')
        self.addMail(model, 'support@github.com', 'Github Projects','02/02/2017 03:05 PM')
        self.addMail(model, 'service@phone.com', 'Your Phone Bill','01/01/2017 04:05 PM')
        self.addMail(model, 'service@abc.com', 'aaaYour Github Donation','03/25/2017 02:05 PM')
        self.addMail(model, 'support@def.com', 'bbbGithub Projects','02/02/2017 03:05 PM')
        self.addMail(model, 'service@xyz.com', 'cccYour Phone Bill','01/01/2017 04:05 PM')

        mainLayout = QVBoxLayout()
        mainLayout.addWidget(groupBox)
        self.setLayout(mainLayout)

        self.show()

    def createMailModel(self,parent):
        model = QStandardItemModel(0, 3, parent)
        model.setHeaderData(self.FROM, Qt.Horizontal, "From")
        model.setHeaderData(self.SUBJECT, Qt.Horizontal, "Subject")
        model.setHeaderData(self.DATE, Qt.Horizontal, "Date")
        return model

    def addMail(self,model, mailFrom, subject, date):
        model.insertRow(0)
        model.setData(model.index(0, self.FROM), mailFrom)
        model.setData(model.index(0, self.SUBJECT), subject)
        model.setData(model.index(0, self.DATE), date)

    def rearrange_column_layout(self, treeView):
        print("restore_column_layout() called.")

        list_custom: list = ['Date', 'Subject', 'From']
        list_origin: list = []
        model = treeView.model()
        header = treeView.header()
        col_count = model.columnCount()
        for col_search_index in range(col_count):
            col_found = header.visualIndex(col_search_index)
            header_txt = model.headerData(col_search_index, Qt.Horizontal, Qt.DisplayRole)
            list_origin.append(header_txt)
        print(f"{list_origin=}")
        print(f"{list_custom=}")
        pos_custom: int = 0
        pos_origin_last: int = 0
        for item_custom in list_custom:
            pos_origin: int = 0
            for item_origin in list_origin:
                if item_custom == item_origin:
                    msg_txt = f"moving col '{item_origin}' from {pos_origin} to {pos_custom}."
                    print(msg_txt)
                    QMessageBox.information(self, f"{item_origin}", msg_txt)
                    header.moveSection(pos_origin, pos_custom)
                    pos_origin_last = pos_origin
                pos_origin += 1
            pos_custom += 1


if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = App()
    sys.exit(app.exec_())

我想根据输入列表设置列顺序

"list_origin" 包含原始顺序的 header 名称，例如 list_origin=['From', 'Subject', 'Date']

"list_custom" 是我的 QTreeView 中列的所需顺序，例如 list_custom=['Date', 'Subject', 'From']

现在我正在遍历自定义列表，并希望使用 header moveSection() 放置基于此位置的列。

所以算法基本上是：

step1: 从自定义列表的索引 0 开始，它是“日期”

step2：从origin列表中获取“Date”的位置，即2。

第三步：调用 moveSection(2,0)

跟踪输出：

将 col 'Date' 从 2 移动到 0。

将 col 'Subject' 从 1 移动到 1。

将 col 'From' 从 0 移动到 2。

但无论如何，结果是“发件人”/“主题”/“日期”(!) 而不是所需的“日期”/“主题”/“发件人”。

Answer 1

由于视觉顺序在循环内发生变化，因此逻辑是在迭代时获取每个元素的索引：

def rearrange_column_layout(self, treeView):
    to_list = ["Date", "Subject", "From"]

    header = treeView.header()
    model = treeView.model()
    for i, c in enumerate(to_list[:-1]):
        from_list = [
            model.headerData(header.logicalIndex(visual_index), Qt.Horizontal)
            for visual_index in range(header.count())
        ]
        j = from_list.index(c)
        header.moveSection(j, i)

如何根据作为输入的列表正确排序 QTreeView 中的列

How to properly order columns in a QTreeView based on a list as input

python

pyqt

pyqt5

qtreeview