mainwindow.cpp Example File

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  #include "mainwindow.h"
  #include "treemodel.h"

  #include <QFile>

  MainWindow::MainWindow(QWidget *parent)
      : QMainWindow(parent)
  {
      setupUi(this);

      QStringList headers;
      headers << tr("Title") << tr("Description");

      QFile file(":/default.txt");
      file.open(QIODevice::ReadOnly);
      TreeModel *model = new TreeModel(headers, file.readAll());
      file.close();

      view->setModel(model);
      for (int column = 0; column < model->columnCount(); ++column)
          view->resizeColumnToContents(column);

      connect(exitAction, &QAction::triggered, qApp, &QCoreApplication::quit);

      connect(view->selectionModel(), &QItemSelectionModel::selectionChanged,
              this, &MainWindow::updateActions);

      connect(actionsMenu, &QMenu::aboutToShow, this, &MainWindow::updateActions);
      connect(insertRowAction, &QAction::triggered, this, &MainWindow::insertRow);
      connect(insertColumnAction, &QAction::triggered, this, &MainWindow::insertColumn);
      connect(removeRowAction, &QAction::triggered, this, &MainWindow::removeRow);
      connect(removeColumnAction, &QAction::triggered, this, &MainWindow::removeColumn);
      connect(insertChildAction, &QAction::triggered, this, &MainWindow::insertChild);

      updateActions();
  }

  void MainWindow::insertChild()
  {
      QModelIndex index = view->selectionModel()->currentIndex();
      QAbstractItemModel *model = view->model();

      if (model->columnCount(index) == 0) {
          if (!model->insertColumn(0, index))
              return;
      }

      if (!model->insertRow(0, index))
          return;

      for (int column = 0; column < model->columnCount(index); ++column) {
          QModelIndex child = model->index(0, column, index);
          model->setData(child, QVariant("[No data]"), Qt::EditRole);
          if (!model->headerData(column, Qt::Horizontal).isValid())
              model->setHeaderData(column, Qt::Horizontal, QVariant("[No header]"), Qt::EditRole);
      }

      view->selectionModel()->setCurrentIndex(model->index(0, 0, index),
                                              QItemSelectionModel::ClearAndSelect);
      updateActions();
  }

  bool MainWindow::insertColumn()
  {
      QAbstractItemModel *model = view->model();
      int column = view->selectionModel()->currentIndex().column();

      // Insert a column in the parent item.
      bool changed = model->insertColumn(column + 1);
      if (changed)
          model->setHeaderData(column + 1, Qt::Horizontal, QVariant("[No header]"), Qt::EditRole);

      updateActions();

      return changed;
  }

  void MainWindow::insertRow()
  {
      QModelIndex index = view->selectionModel()->currentIndex();
      QAbstractItemModel *model = view->model();

      if (!model->insertRow(index.row()+1, index.parent()))
          return;

      updateActions();

      for (int column = 0; column < model->columnCount(index.parent()); ++column) {
          QModelIndex child = model->index(index.row()+1, column, index.parent());
          model->setData(child, QVariant("[No data]"), Qt::EditRole);
      }
  }

  bool MainWindow::removeColumn()
  {
      QAbstractItemModel *model = view->model();
      int column = view->selectionModel()->currentIndex().column();

      // Insert columns in each child of the parent item.
      bool changed = model->removeColumn(column);

      if (changed)
          updateActions();

      return changed;
  }

  void MainWindow::removeRow()
  {
      QModelIndex index = view->selectionModel()->currentIndex();
      QAbstractItemModel *model = view->model();
      if (model->removeRow(index.row(), index.parent()))
          updateActions();
  }

  void MainWindow::updateActions()
  {
      bool hasSelection = !view->selectionModel()->selection().isEmpty();
      removeRowAction->setEnabled(hasSelection);
      removeColumnAction->setEnabled(hasSelection);

      bool hasCurrent = view->selectionModel()->currentIndex().isValid();
      insertRowAction->setEnabled(hasCurrent);
      insertColumnAction->setEnabled(hasCurrent);

      if (hasCurrent) {
          view->closePersistentEditor(view->selectionModel()->currentIndex());

          int row = view->selectionModel()->currentIndex().row();
          int column = view->selectionModel()->currentIndex().column();
          if (view->selectionModel()->currentIndex().parent().isValid())
              statusBar()->showMessage(tr("Position: (%1,%2)").arg(row).arg(column));
          else
              statusBar()->showMessage(tr("Position: (%1,%2) in top level").arg(row).arg(column));
      }
  }