mainwindow.cpp Example File | Enginio C++ Classes and Examples 1.1

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- Enginio C++ Examples - Todos
- mainwindow.cpp Example File
- Enginio 1.1.2 Reference Documentation

# mainwindow.cpp Example File

todos-cpp/mainwindow.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
    ** Contact: http://www.qt-project.org/legal
    **
    ** This file is part of the 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
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    **   * Redistributions of source code must retain the above copyright
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    **     of its contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
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    #include <QtWidgets/qframe.h>
    #include <QtWidgets/qlabel.h>
    #include <QtWidgets/qlistview.h>
    #include <QtWidgets/qpushbutton.h>
    #include <QtWidgets/qtoolbar.h>
    #include <QtWidgets/qinputdialog.h>
    #include <QtWidgets/qlayout.h>

    #include <QtCore/qjsondocument.h>
    #include <QtCore/qjsonobject.h>

    #include <Enginio/enginioclient.h>
    #include <Enginio/enginioreply.h>

    // To get the backend right, we use a helper class in the example.
    // Usually one would just insert the backend information below.
    #include "backendhelper.h"

    #include "mainwindow.h"
    #include "todosmodel.h"

    MainWindow::MainWindow(QWidget *parent)
        : QMainWindow(parent)
    {
        setWindowTitle(QStringLiteral("Enginio TODO example"));

        QByteArray EnginioBackendId = backendId("todo");

        m_client = new EnginioClient(this);
        m_client->setBackendId(EnginioBackendId);

        QObject::connect(m_client, &EnginioClient::error, this, &MainWindow::error);

        m_model = new TodosModel(this);
        m_model->setClient(m_client);

        QJsonObject query;
        query["objectType"] = QString::fromUtf8("objects.todos");
        m_model->setQuery(query);

        QToolBar *toolBar = new QToolBar(this);
        m_addNewButton = new QPushButton(toolBar);
        m_addNewButton->setText("&Add");
        QObject::connect(m_addNewButton, &QPushButton::clicked, this, &MainWindow::appendItem);

        m_removeButton = new QPushButton(toolBar);
        m_removeButton->setText("&Remove");
        m_removeButton->setEnabled(false);
        QObject::connect(m_removeButton, &QPushButton::clicked, this, &MainWindow::removeItem);

        m_toggleButton = new QPushButton(toolBar);
        m_toggleButton->setText("&Toggle Completed");
        m_toggleButton->setEnabled(false);
        QObject::connect(m_toggleButton, &QPushButton::clicked, this, &MainWindow::toggleCompleted);

        toolBar->addWidget(m_addNewButton);
        toolBar->addWidget(m_removeButton);
        toolBar->addWidget(m_toggleButton);

        m_view = new QTreeView(this);
        m_view->setAlternatingRowColors(true);
        QFrame *frame = new QFrame(this);
        QVBoxLayout *windowLayout = new QVBoxLayout(frame);
        windowLayout->addWidget(m_view);
        windowLayout->addWidget(toolBar);
        setCentralWidget(frame);

        m_view->setModel(m_model);

        m_view->setSelectionModel(new QItemSelectionModel(m_model, m_model));
        QObject::connect(m_view->selectionModel(), &QItemSelectionModel::selectionChanged, this, &MainWindow::selectionChanged);
    }

    QSize MainWindow::sizeHint() const
    {
        return QSize(400, 600);
    }

    void MainWindow::error(EnginioReply *error)
    {
        qWarning() << Q_FUNC_INFO << error;
    }

    void MainWindow::removeItem()
    {
        QModelIndex index = m_view->currentIndex();
        EnginioReply *reply = m_model->remove(index.row());
        QObject::connect(reply, &EnginioReply::finished, reply, &EnginioReply::deleteLater);
    }

    void MainWindow::appendItem()
    {
        bool ok;
        QString text = QInputDialog::getText(this, tr("Create a new To Do")
                                             , tr("Title:"), QLineEdit::Normal
                                             , "", &ok);
        if (ok && !text.isEmpty()){
            QJsonObject object;
            object["title"] = text;
            object["completed"] = false; // By default a new To Do is not completed
            EnginioReply *reply = m_model->append(object);
            QObject::connect(reply, &EnginioReply::finished, reply, &EnginioReply::deleteLater);
        }
    }

    void MainWindow::toggleCompleted()
    {
        QModelIndex index = m_view->currentIndex();
        bool completed = m_model->data(index, m_model->CompletedRole).toBool();
        m_model->setData(index, QVariant(!completed), TodosModel::CompletedRole);
    }

    void MainWindow::selectionChanged(const QItemSelection &selected, const QItemSelection &deselected)
    {
        Q_UNUSED(deselected);
        bool value = selected.count();
        m_removeButton->setEnabled(value);
        m_toggleButton->setEnabled(value);
    }