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# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
import sys
from pathlib import Path
from PySide6.QtCore import (QAbstractItemModel, QItemSelectionModel,
QModelIndex, Qt, Slot)
from PySide6.QtWidgets import (QAbstractItemView, QMainWindow, QTreeView,
QWidget)
from PySide6.QtTest import QAbstractItemModelTester
from treemodel import TreeModel
class MainWindow(QMainWindow):
def __init__(self, parent: QWidget = None):
super().__init__(parent)
self.resize(573, 468)
self.view = QTreeView()
self.view.setAlternatingRowColors(True)
self.view.setSelectionBehavior(QAbstractItemView.SelectItems)
self.view.setHorizontalScrollMode(QAbstractItemView.ScrollPerPixel)
self.view.setAnimated(False)
self.view.setAllColumnsShowFocus(True)
self.setCentralWidget(self.view)
menubar = self.menuBar()
file_menu = menubar.addMenu("&File")
self.exit_action = file_menu.addAction("E&xit")
self.exit_action.setShortcut("Ctrl+Q")
self.exit_action.triggered.connect(self.close)
actions_menu = menubar.addMenu("&Actions")
actions_menu.triggered.connect(self.update_actions)
self.insert_row_action = actions_menu.addAction("Insert Row")
self.insert_row_action.setShortcut("Ctrl+I, R")
self.insert_row_action.triggered.connect(self.insert_row)
self.insert_column_action = actions_menu.addAction("Insert Column")
self.insert_column_action.setShortcut("Ctrl+I, C")
self.insert_column_action.triggered.connect(self.insert_column)
actions_menu.addSeparator()
self.remove_row_action = actions_menu.addAction("Remove Row")
self.remove_row_action.setShortcut("Ctrl+R, R")
self.remove_row_action.triggered.connect(self.remove_row)
self.remove_column_action = actions_menu.addAction("Remove Column")
self.remove_column_action.setShortcut("Ctrl+R, C")
self.remove_column_action.triggered.connect(self.remove_column)
actions_menu.addSeparator()
self.insert_child_action = actions_menu.addAction("Insert Child")
self.insert_child_action.setShortcut("Ctrl+N")
self.insert_child_action.triggered.connect(self.insert_child)
help_menu = menubar.addMenu("&Help")
about_qt_action = help_menu.addAction("About Qt", qApp.aboutQt) # noqa: F821
about_qt_action.setShortcut("F1")
self.setWindowTitle("Editable Tree Model")
headers = ["Title", "Description"]
file = Path(__file__).parent / "default.txt"
self.model = TreeModel(headers, file.read_text(), self)
if "-t" in sys.argv:
QAbstractItemModelTester(self.model, self)
self.view.setModel(self.model)
self.view.expandAll()
for column in range(self.model.columnCount()):
self.view.resizeColumnToContents(column)
selection_model = self.view.selectionModel()
selection_model.selectionChanged.connect(self.update_actions)
self.update_actions()
@Slot()
def insert_child(self) -> None:
selection_model = self.view.selectionModel()
index: QModelIndex = selection_model.currentIndex()
model: QAbstractItemModel = self.view.model()
if model.columnCount(index) == 0:
if not model.insertColumn(0, index):
return
if not model.insertRow(0, index):
return
for column in range(model.columnCount(index)):
child: QModelIndex = model.index(0, column, index)
model.setData(child, "[No data]", Qt.EditRole)
if not model.headerData(column, Qt.Horizontal):
model.setHeaderData(column, Qt.Horizontal, "[No header]",
Qt.EditRole)
selection_model.setCurrentIndex(
model.index(0, 0, index), QItemSelectionModel.ClearAndSelect
)
self.update_actions()
@Slot()
def insert_column(self) -> None:
model: QAbstractItemModel = self.view.model()
column: int = self.view.selectionModel().currentIndex().column()
changed: bool = model.insertColumn(column + 1)
if changed:
model.setHeaderData(column + 1, Qt.Horizontal, "[No header]",
Qt.EditRole)
self.update_actions()
@Slot()
def insert_row(self) -> None:
index: QModelIndex = self.view.selectionModel().currentIndex()
model: QAbstractItemModel = self.view.model()
parent: QModelIndex = index.parent()
if not model.insertRow(index.row() + 1, parent):
return
self.update_actions()
for column in range(model.columnCount(parent)):
child: QModelIndex = model.index(index.row() + 1, column, parent)
model.setData(child, "[No data]", Qt.EditRole)
@Slot()
def remove_column(self) -> None:
model: QAbstractItemModel = self.view.model()
column: int = self.view.selectionModel().currentIndex().column()
if model.removeColumn(column):
self.update_actions()
@Slot()
def remove_row(self) -> None:
index: QModelIndex = self.view.selectionModel().currentIndex()
model: QAbstractItemModel = self.view.model()
if model.removeRow(index.row(), index.parent()):
self.update_actions()
@Slot()
def update_actions(self) -> None:
selection_model = self.view.selectionModel()
has_selection: bool = not selection_model.selection().isEmpty()
self.remove_row_action.setEnabled(has_selection)
self.remove_column_action.setEnabled(has_selection)
current_index = selection_model.currentIndex()
has_current: bool = current_index.isValid()
self.insert_row_action.setEnabled(has_current)
self.insert_column_action.setEnabled(has_current)
if has_current:
self.view.closePersistentEditor(current_index)
msg = f"Position: ({current_index.row()},{current_index.column()})"
if not current_index.parent().isValid():
msg += " in top level"
self.statusBar().showMessage(msg)
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