mainwindow.cpp Example File

todos-cpp/mainwindow.cpp

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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);
  }