Qt 1.6 | Enginio Manual | Enginio C++ Examples - Todos | mainwindow.cpp Example File

Qt 1.6.3 Reference Documentation

# 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);
      }