# Copyright (C) 2013 Riverbank Computing Limited. # Copyright (C) 2022 The Qt Company Ltd. # SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause import sys from PySide6.QtCore import Qt, Signal, Slot from PySide6.QtWidgets import (QApplication, QDialog, QGridLayout, QHBoxLayout, QLabel, QLineEdit, QMessageBox, QPushButton, QTextEdit, QVBoxLayout, QWidget) class SortedDict(dict): class Iterator(object): def __init__(self, sorted_dict): self._dict = sorted_dict self._keys = sorted(self._dict.keys()) self._nr_items = len(self._keys) self._idx = 0 def __iter__(self): return self def next(self): if self._idx >= self._nr_items: raise StopIteration key = self._keys[self._idx] value = self._dict[key] self._idx += 1 return key, value __next__ = next def __iter__(self): return SortedDict.Iterator(self) iterkeys = __iter__ class AddressBook(QWidget): NavigationMode, AddingMode, EditingMode = range(3) def __init__(self, parent=None): super().__init__(parent) self.contacts = SortedDict() self._old_name = '' self._old_address = '' self._current_mode = self.NavigationMode name_label = QLabel("Name:") self._name_line = QLineEdit() self._name_line.setReadOnly(True) address_label = QLabel("Address:") self._address_text = QTextEdit() self._address_text.setReadOnly(True) self._add_button = QPushButton("&Add") self._edit_button = QPushButton("&Edit") self._edit_button.setEnabled(False) self._remove_button = QPushButton("&Remove") self._remove_button.setEnabled(False) self._submit_button = QPushButton("&Submit") self._submit_button.hide() self._cancel_button = QPushButton("&Cancel") self._cancel_button.hide() self._next_button = QPushButton("&Next") self._next_button.setEnabled(False) self._previous_button = QPushButton("&Previous") self._previous_button.setEnabled(False) self._add_button.clicked.connect(self.add_contact) self._submit_button.clicked.connect(self.submit_contact) self._edit_button.clicked.connect(self.edit_contact) self._remove_button.clicked.connect(self.remove_contact) self._cancel_button.clicked.connect(self.cancel) self._next_button.clicked.connect(self.next) self._previous_button.clicked.connect(self.previous) button_layout_1 = QVBoxLayout() button_layout_1.addWidget(self._add_button) button_layout_1.addWidget(self._edit_button) button_layout_1.addWidget(self._remove_button) button_layout_1.addWidget(self._submit_button) button_layout_1.addWidget(self._cancel_button) button_layout_1.addStretch() button_layout_2 = QHBoxLayout() button_layout_2.addWidget(self._previous_button) button_layout_2.addWidget(self._next_button) main_layout = QGridLayout() main_layout.addWidget(name_label, 0, 0) main_layout.addWidget(self._name_line, 0, 1) main_layout.addWidget(address_label, 1, 0, Qt.AlignTop) main_layout.addWidget(self._address_text, 1, 1) main_layout.addLayout(button_layout_1, 1, 2) main_layout.addLayout(button_layout_2, 3, 1) self.setLayout(main_layout) self.setWindowTitle("Simple Address Book") def add_contact(self): self._old_name = self._name_line.text() self._old_address = self._address_text.toPlainText() self._name_line.clear() self._address_text.clear() self.update_interface(self.AddingMode) def edit_contact(self): self._old_name = self._name_line.text() self._old_address = self._address_text.toPlainText() self.update_interface(self.EditingMode) def submit_contact(self): name = self._name_line.text() address = self._address_text.toPlainText() if name == "" or address == "": QMessageBox.information(self, "Empty Field", "Please enter a name and address.") return if self._current_mode == self.AddingMode: if name not in self.contacts: self.contacts[name] = address QMessageBox.information(self, "Add Successful", f'"{name}" has been added to your address book.') else: QMessageBox.information(self, "Add Unsuccessful", f'Sorry, "{name}" is already in your address book.') return elif self._current_mode == self.EditingMode: if self._old_name != name: if name not in self.contacts: QMessageBox.information(self, "Edit Successful", f'"{self.oldName}" has been edited in your address book.') del self.contacts[self._old_name] self.contacts[name] = address else: QMessageBox.information(self, "Edit Unsuccessful", f'Sorry, "{name}" is already in your address book.') return elif self._old_address != address: QMessageBox.information(self, "Edit Successful", f'"{name}" has been edited in your address book.') self.contacts[name] = address self.update_interface(self.NavigationMode) def cancel(self): self._name_line.setText(self._old_name) self._address_text.setText(self._old_address) self.update_interface(self.NavigationMode) def remove_contact(self): name = self._name_line.text() address = self._address_text.toPlainText() if name in self.contacts: button = QMessageBox.question(self, "Confirm Remove", f'Are you sure you want to remove "{name}"?', QMessageBox.Yes | QMessageBox.No) if button == QMessageBox.Yes: self.previous() del self.contacts[name] QMessageBox.information(self, "Remove Successful", f'"{name}" has been removed from your address book.') self.update_interface(self.NavigationMode) def next(self): name = self._name_line.text() it = iter(self.contacts) try: while True: this_name, _ = it.next() if this_name == name: next_name, next_address = it.next() break except StopIteration: next_name, next_address = iter(self.contacts).next() self._name_line.setText(next_name) self._address_text.setText(next_address) def previous(self): name = self._name_line.text() prev_name = prev_address = None for this_name, this_address in self.contacts: if this_name == name: break prev_name = this_name prev_address = this_address else: self._name_line.clear() self._address_text.clear() return if prev_name is None: for prev_name, prev_address in self.contacts: pass self._name_line.setText(prev_name) self._address_text.setText(prev_address) def update_interface(self, mode): self._current_mode = mode if self._current_mode in (self.AddingMode, self.EditingMode): self._name_line.setReadOnly(False) self._name_line.setFocus(Qt.OtherFocusReason) self._address_text.setReadOnly(False) self._add_button.setEnabled(False) self._edit_button.setEnabled(False) self._remove_button.setEnabled(False) self._next_button.setEnabled(False) self._previous_button.setEnabled(False) self._submit_button.show() self._cancel_button.show() elif self._current_mode == self.NavigationMode: if not self.contacts: self._name_line.clear() self._address_text.clear() self._name_line.setReadOnly(True) self._address_text.setReadOnly(True) self._add_button.setEnabled(True) number = len(self.contacts) self._edit_button.setEnabled(number >= 1) self._remove_button.setEnabled(number >= 1) self._next_button.setEnabled(number > 1) self._previous_button.setEnabled(number > 1) self._submit_button.hide() self._cancel_button.hide() if __name__ == '__main__': app = QApplication(sys.argv) address_book = AddressBook() address_book.show() sys.exit(app.exec())