listview - GitPress.io

Example Python program listview.py This program creates a PyQt GUI Python version 3.x or newer. To check the Python version use:

python --version

Modules

from PyQt5 import QtCore, QtGui, QtWidgets, uic
from PyQt5.QtCore import Qt
import sys

Classes

class EmptyModel(QtCore.QStringListModel):
class StringListModel(QtCore.QStringListModel):
class SelectableModel(EmptyModel):

Methods

def init(self, n):
def rowCount(self, parent):
def data(self, index, role):
def init(self, data):
def rowCount(self, parent):
def data(self, index, role):
def init(self, n):
def select(self, index):

Code

Example Python PyQt program :

from PyQt5 import QtCore, QtGui, QtWidgets, uic
from PyQt5.QtCore import Qt


COLORS = [QtGui.QColor(n) for n in ['pink', 'skyblue', 'red']]


class EmptyModel(QtCore.QStringListModel):
    '''データの個数だけを記録し、要素の値はインデックスから計算する。'''

    def __init__(self, n):
        super().__init__()
        self.n = n

    def rowCount(self, parent):
        return self.n

    def data(self, index, role):
        i = index.row()
        if role == Qt.DisplayRole:      return i * i
        elif role == Qt.BackgroundRole: return COLORS[i % 2]


class StringListModel(QtCore.QStringListModel):
    '''self.data にデータを保存する。'''

    def __init__(self, data):
        super().__init__()
        self.data = data

    def rowCount(self, parent):
        return len(self.data)

    def data(self, index, role):
        i = index.row()
        if role == Qt.DisplayRole:      return self.data[i]
        elif role == Qt.BackgroundRole: return COLORS[i % 2]


class SelectableModel(EmptyModel):
    '''クリックされたデータを表示する'''

    def __init__(self, n):
        super().__init__(n)

    def select(self, index):
        print('{1}@{0}'.format(index.row(), self.data(index, Qt.DisplayRole)))


if __name__ == '__main__':
    import sys

    app = QtWidgets.QApplication(sys.argv)

    models = [EmptyModel(100),
              StringListModel([str(i * i) for i in range(100)]),
              SelectableModel(100)]

    for model in models:
        view = QtWidgets.QListView()
        view.setModel(model)
        view.setWindowTitle(model.__class__.__doc__)
        if model == models[2]:
            view.clicked.connect(view.model().select)
        view.show()
        app.exec()

Useful Links

Articles: https://python-commandments.org/
PyQt: https://pythonpyqt.com/
Tutorial: https://pythonprogramminglanguage.com/