通过 QStardItemModel() 在 QTreeView()-Object 中存储和检索 items/rows 上的数据

Question

我正在将 SQLite 数据库中的数据填充到 PyQt5 TreeView 控件 (QTreeView) 中。数据通过 QStandardItemModel() 写入。

问题：我想记住每行的 row_id，而不显示它。我曾经在查询中 select 它但隐藏了该列。但是当从索引为 0 的列中查询 row_id 时，这会失败，因为它不可见。

我不知道 a.) 如何存储 row_id 以便 b.) 稍后检索它。我想遍历 selected 行并使用相应的 row_id 执行一些操作（例如批量删除、批量编辑、批量复制等）

model.setData 总是需要一个列索引...Qt.UserRole 似乎无法检索数据。

代码：

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import sys
from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *

class App(QWidget):
    MAIL_RANGE = 4
    ID, FROM, SUBJECT, DATE = range(MAIL_RANGE)

    def __init__(self):
        super().__init__()      
        self.left = 10
        self.top = 10
        self.width = 640
        self.height = 240
        self.initUI()

        self.dataView.setSelectionMode(QAbstractItemView.ExtendedSelection)  #  <- enable selection of rows in tree
        self.dataView.setEditTriggers(QAbstractItemView.NoEditTriggers)      #  <- disable editing items in tree

        for i in range(0, 2):
            self.dataView.resizeColumnToContents(i)

        self.pbOk = QPushButton(self)
        self.pbOk.setText("Ok")
        self.pbOk.move(400,0)
        self.pbOk.show()

        # connect handlers
        self.dataView.doubleClicked.connect(self.on_dataView_doubleClicked)
        self.pbOk.clicked.connect(self.on_pbOk_clicked)

    def on_dataView_doubleClicked(self):
        print("on_dataView_doubleClicked() called.")

    def on_pbOk_clicked(self):
        print("on_pbOk_clicked() called.")

        # get all IDs
        message: str = ""
        col_ind: int = 0
        for item in self.dataView.selectedIndexes():
            if col_ind % (self.MAIL_RANGE) == 0:  # indicates a row beginning
                text = item.data(Qt.DisplayRole)  # or ix.data()
                message = message + "\n" + str(text)
                self.create_dialog(text)
            col_ind += 1
        print(message)

    def create_dialog(self, id):
        print("dialog called for " + str(id))
        myDlg = QDialog(self)
        lbl = QLabel(myDlg)
        lbl.setText("Hello id: " + str(id))        
        myDlg.show()
        myDlg.resize(300,200)

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

        self.dataGroupBox = QGroupBox("Inbox")
        self.dataView = QTreeView()
        self.dataView.setRootIsDecorated(False)
        self.dataView.setAlternatingRowColors(True)        

        dataLayout = QHBoxLayout()
        dataLayout.addWidget(self.dataView)
        self.dataGroupBox.setLayout(dataLayout)

        model = self.createMailModel(self)
        self.dataView.setModel(model)
        self.addMail(model, 1, 'service@github.com', 'Your Github Donation','03/25/2017 02:05 PM')
        self.addMail(model, 2, 'support@github.com', 'Github Projects','02/02/2017 03:05 PM')
        self.addMail(model, 3, 'service@phone.com', 'Your Phone Bill','01/01/2017 04:05 PM')
        self.addMail(model, 4, 'service@abc.com', 'aaaYour Github Donation','03/25/2017 02:05 PM')
        self.addMail(model, 5, 'support@def.com', 'bbbGithub Projects','02/02/2017 03:05 PM')
        self.addMail(model, 6, 'service@xyz.com', 'cccYour Phone Bill','01/01/2017 04:05 PM')

        self.dataView.setColumnHidden(0, True)

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

        self.show()

    def createMailModel(self,parent):
        model = QStandardItemModel(0, self.MAIL_RANGE, parent)
        model.setHeaderData(self.ID, Qt.Horizontal, "ID")
        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, mailID, mailFrom, subject, date):
        model.insertRow(0)
        model.setData(model.index(0, self.ID), mailID)
        model.setData(model.index(0, self.FROM), mailFrom)
        model.setData(model.index(0, self.SUBJECT), subject)
        model.setData(model.index(0, self.DATE), date)        

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

总结：

1.) 在 addMail() 上，我想将 ID 添加到插入的行。

2.) 在 on_pbOk_clicked() 事件中，我想遍历 selected 行并获取每一行的所有 ID。

如果我将 ID 添加为单独的列，我以后将无法检索它，因为这不适用于隐藏的列。

Answer 1

当您确定选择是按行进行时，只需获取行并对其进行迭代，在这种情况下，使用 set 获取选定的行并在列上进行迭代。

def on_pbOk_clicked(self):
    message: str = ""
    rows = set(ix.row() for ix in self.dataView.selectedIndexes())
    for row in rows:
        values_for_row = []
        for col in range(App.MAIL_RANGE):
            it = self.dataView.model().item(row, col)
            values_for_row.append(it.text())
        text = " ".join(values_for_row)
        self.create_dialog(text)
        message += "\n" + text
    print(message)

通过 QStardItemModel() 在 QTreeView()-Object 中存储和检索 items/rows 上的数据

store and retrieve data on items/rows in a QTreeView()-Object via QStardItemModel()

python

pyqt

qtreeview

qstandarditemmodel

pyqt5