mainwindow.cpp Example File

itemviews/editabletreemodel/mainwindow.cpp
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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)); } }