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path: root/examples/widgets/tutorials/addressbook/part6.py
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#############################################################################
##
## Copyright (C) 2013 Riverbank Computing Limited.
## Copyright (C) 2021 The Qt Company Ltd.
## Contact: http://www.qt.io/licensing/
##
## This file is part of the Qt for Python examples of the Qt Toolkit.
##
## $QT_BEGIN_LICENSE:BSD$
## You may use this file under the terms of the BSD license as follows:
##
## "Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following conditions are
## met:
##   * Redistributions of source code must retain the above copyright
##     notice, this list of conditions and the following disclaimer.
##   * Redistributions in binary form must reproduce the above copyright
##     notice, this list of conditions and the following disclaimer in
##     the documentation and/or other materials provided with the
##     distribution.
##   * Neither the name of The Qt Company Ltd nor the names of its
##     contributors may be used to endorse or promote products derived
##     from this software without specific prior written permission.
##
##
## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
##
## $QT_END_LICENSE$
##
#############################################################################

import pickle
import sys

from PySide6.QtCore import QFile, QIODevice, QTextStream, Qt, Signal, Slot
from PySide6.QtWidgets import (QApplication, QDialog, QFileDialog,
                               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(AddressBook, self).__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._find_button = QPushButton("&Find")
        self._find_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._load_button = QPushButton("&Load...")
        self._load_button.setToolTip("Load contacts from a file")
        self._save_button = QPushButton("Sa&ve...")
        self._save_button.setToolTip("Save contacts to a file")
        self._save_button.setEnabled(False)

        self.dialog = FindDialog()

        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._find_button.clicked.connect(self.find_contact)
        self._cancel_button.clicked.connect(self.cancel)
        self._next_button.clicked.connect(self.next)
        self._previous_button.clicked.connect(self.previous)
        self._load_button.clicked.connect(self.load_from_file)
        self._save_button.clicked.connect(self.save_to_file)

        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._find_button)
        button_layout_1.addWidget(self._submit_button)
        button_layout_1.addWidget(self._cancel_button)
        button_layout_1.addWidget(self._load_button)
        button_layout_1.addWidget(self._save_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, 2, 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 find_contact(self):
        self.dialog.show()

        if self.dialog.exec_() == QDialog.Accepted:
            contact_name = self.dialog.get_find_text()

            if contact_name in self.contacts:
                self._name_line.setText(contact_name)
                self._address_text.setText(self.contacts[contact_name])
            else:
                QMessageBox.information(self, "Contact Not Found",
                        f'Sorry, "{contact_name}" is not in your address book.')
                return

        self.update_interface(self.NavigationMode)

    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()

            self._load_button.setEnabled(False)
            self._save_button.setEnabled(False)

        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._find_button.setEnabled(number > 2)
            self._next_button.setEnabled(number > 1)
            self._previous_button.setEnabled(number >1 )

            self._submit_button.hide()
            self._cancel_button.hide()

            self._load_button.setEnabled(True)
            self._save_button.setEnabled(number >= 1)

    def save_to_file(self):
        fileName,_ = QFileDialog.getSaveFileName(self,
                "Save Address Book", '',
                "Address Book (*.abk);;All Files (*)")

        if not fileName:
            return

        try:
            out_file = open(str(fileName), 'wb')
        except IOError:
            QMessageBox.information(self, "Unable to open file",
                    f'There was an error opening "{fileName}"')
            return

        pickle.dump(self.contacts, out_file)
        out_file.close()

    def load_from_file(self):
        fileName,_ = QFileDialog.getOpenFileName(self,
                "Open Address Book", '',
                "Address Book (*.abk);;All Files (*)")

        if not fileName:
            return

        try:
            in_file = open(str(fileName), 'rb')
        except IOError:
            QMessageBox.information(self, "Unable to open file",
                    f'There was an error opening "{fileName}"')
            return

        self.contacts = pickle.load(in_file)
        in_file.close()

        if len(self.contacts) == 0:
            QMessageBox.information(self, "No contacts in file",
                    "The file you are attempting to open contains no "
                    "contacts.")
        else:
            for name, address in self.contacts:
                self._name_line.setText(name)
                self._address_text.setText(address)

        self.update_interface(self.NavigationMode)


class FindDialog(QDialog):
    def __init__(self, parent=None):
        super(FindDialog, self).__init__(parent)

        find_label = QLabel("Enter the name of a contact:")
        self._line_edit = QLineEdit()

        self._find_button = QPushButton("&Find")
        self._find_text = ''

        layout = QHBoxLayout()
        layout.addWidget(find_label)
        layout.addWidget(self._line_edit)
        layout.addWidget(self._find_button)

        self.setLayout(layout)
        self.setWindowTitle("Find a Contact")

        self._find_button.clicked.connect(self.find_clicked)
        self._find_button.clicked.connect(self.accept)

    def find_clicked(self):
        text = self._line_edit.text()

        if not text:
            QMessageBox.information(self, "Empty Field",
                    "Please enter a name.")
            return

        self._find_text = text
        self._line_edit.clear()
        self.hide()

    def get_find_text(self):
        return self._find_text


if __name__ == '__main__':
    app = QApplication(sys.argv)

    address_book = AddressBook()
    address_book.show()

    sys.exit(app.exec_())