pyqt5 QListView setModel QAbstractListModel

代码：

# todict
# https://github.com/SiggiGue/qdictionarytree

# 本文
# https://www.learnpyqt.com/courses/model-views/modelview-architecture/

import sys
import json
from PyQt5 import QtCore, QtGui, QtWidgets, uic
from PyQt5.QtCore import *
import sys
import sys
from PyQt5.QtWidgets import QWidget, QToolTip, QApplication
from PyQt5.QtGui import QFont
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
import sys

# There is interesting way
# no need to compile...
# I am wondering if this works to exe file..since it's make file less

tick = QtGui.QImage('tick2.png')

class TodoModel(QtCore.QAbstractListModel):
    def __init__(self, *args, todos=None, **kwargs):
        super(TodoModel, self).__init__(*args, **kwargs)
        self.todos = todos or []

    def data(self, index, role):
        if role == Qt.DisplayRole:
            _, text = self.todos[index.row()]
            return text

        if role == Qt.DecorationRole:
            status, _ = self.todos[index.row()]
            if status:
                return tick

    def rowCount(self, index):
        return len(self.todos)


class MainWindow(QtWidgets.QMainWindow):
    def __init__(self):

        QtWidgets.QMainWindow.__init__(self)

        self.setObjectName("MainWindow")
        self.resize(461, 476)

        self.centralwidget = QtWidgets.QWidget(self)
        self.top_layout = QVBoxLayout()
        self.centralwidget.setLayout(self.top_layout)

        self.completeButton = QtWidgets.QPushButton("Complete")
        self.deleteButton = QtWidgets.QPushButton("Delete")
        self.addButton = QtWidgets.QPushButton("Add Todo")
        self.todoEdit = QtWidgets.QLineEdit()


        self.todoView = QtWidgets.QListView()

        self.top_layout.addWidget(self.todoView)
        self.mid_layout = QHBoxLayout()
        self.mid_layout.addWidget(self.completeButton)
        self.mid_layout.addWidget(self.deleteButton)
        self.top_layout.addLayout(self.mid_layout)
        self.top_layout.addWidget(self.todoEdit)
        self.top_layout.addWidget(self.addButton)

        self.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(self)
        self.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(self)

        self.setStatusBar(self.statusbar)


        self.setWindowTitle("Todo")


        self.model = TodoModel()
        self.load()
        self.todoView.setModel(self.model)
        self.addButton.pressed.connect(self.add)
        self.deleteButton.pressed.connect(self.delete)
        self.completeButton.pressed.connect(self.complete)

    def add(self):
        """
        Add an item to our todo list, getting the text from the QLineEdit .todoEdit
        and then clearing it.
        """
        text = self.todoEdit.text()
        if text: # Don't add empty strings.
            # Access the list via the model.
            self.model.todos.append((False, text))
            # Trigger refresh.
            self.model.layoutChanged.emit()
            # Empty the input
            self.todoEdit.setText("")
            self.save()

    def delete(self):
        # use .selectedIndexes to get index, which is a list with one elt
        indexes = self.todoView.selectedIndexes()
        if indexes:
            # Indexes is a list of a single item in single-select mode.
            index = indexes[0]
            # Remove the item and refresh.
            del self.model.todos[index.row()]
            self.model.layoutChanged.emit()
            # Clear the selection (as it is no longer valid).
            self.todoView.clearSelection()
            self.save()

    def complete(self):
        indexes = self.todoView.selectedIndexes()
        if indexes:
            index = indexes[0]
            row = index.row()
            status, text = self.model.todos[row]
            self.model.todos[row] = (True, text)
            # .dataChanged takes top-left and bottom right, which are equal
            # for a single selection.
            self.model.dataChanged.emit(index, index)
            # Clear the selection (as it is no longer valid).
            self.todoView.clearSelection()
            self.save()

    # how you persist the data
    def load(self):
        try:
            with open('data.json', 'r') as f:
                self.model.todos = json.load(f)
        except Exception:
            pass

    def save(self):
        with open('data.json', 'w') as f:
            data = json.dump(self.model.todos, f)


app = QtWidgets.QApplication(sys.argv)
window = MainWindow()
window.show()
app.exec_()

tick2.png 图形

data.json 的 内容为：

[[true, "aa"], [true, "bb"], [false, "cc"]]

演示效果：

class TodoModel(QtCore.QAbstractListModel):
里面的def data(self, index, role): 函数