mainwindow.cpp Example File

mimetypes/mimetypebrowser/mainwindow.cpp
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#include "mainwindow.h" #include "mimetypemodel.h" #include <QAction> #include <QApplication> #include <QFileDialog> #include <QInputDialog> #include <QMenu> #include <QMenuBar> #include <QMessageBox> #include <QPlainTextEdit> #include <QSplitter> #include <QStatusBar> #include <QTextEdit> #include <QTreeView> #include <QFileInfo> #include <QItemSelectionModel> #include <QMimeDatabase> #include <QMimeType> MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) , m_model(new MimetypeModel(this)) , m_treeView(new QTreeView) , m_detailsText(new QTextEdit) , m_findIndex(0) { setWindowTitle(tr("Qt Mime Database Browser")); QMenu *fileMenu = menuBar()->addMenu(tr("&File")); QAction *detectFileAction = fileMenu->addAction(tr("&Detect File Type..."), this, &MainWindow::detectFile); detectFileAction->setShortcuts(QKeySequence::Open); QAction *exitAction = fileMenu->addAction(tr("E&xit"), qApp, &QApplication::closeAllWindows); exitAction->setShortcuts(QKeySequence::Quit); QMenu *findMenu = menuBar()->addMenu(tr("&Edit")); QAction *findAction = findMenu->addAction(tr("&Find..."), this, &MainWindow::find); findAction->setShortcuts(QKeySequence::Find); m_findNextAction = findMenu->addAction(tr("Find &Next"), this, &MainWindow::findNext); m_findNextAction->setShortcuts(QKeySequence::FindNext); m_findPreviousAction = findMenu->addAction(tr("Find &Previous"), this, &MainWindow::findPrevious); m_findPreviousAction->setShortcuts(QKeySequence::FindPrevious); menuBar()->addMenu(tr("&About"))->addAction(tr("&About Qt"), qApp, &QApplication::aboutQt); QSplitter *centralSplitter = new QSplitter; setCentralWidget(centralSplitter); m_treeView = new QTreeView; m_treeView->setUniformRowHeights(true); m_treeView->setModel(m_model); const auto items = m_model->findItems("application/octet-stream", Qt::MatchContains | Qt::MatchFixedString | Qt::MatchRecursive); if (!items.isEmpty()) m_treeView->expand(m_model->indexFromItem(items.constFirst())); connect(m_treeView->selectionModel(), &QItemSelectionModel::currentChanged, this, &MainWindow::currentChanged); centralSplitter->addWidget(m_treeView); m_detailsText->setReadOnly(true); centralSplitter->addWidget(m_detailsText); updateFindActions(); } void MainWindow::currentChanged(const QModelIndex &index) { if (index.isValid()) m_detailsText->setText(MimetypeModel::formatMimeTypeInfo(m_model->mimeType(index))); else m_detailsText->clear(); } void MainWindow::selectAndGoTo(const QModelIndex &index) { m_treeView->scrollTo(index, QAbstractItemView::PositionAtCenter); m_treeView->setCurrentIndex(index); } void MainWindow::detectFile() { const QString fileName = QFileDialog::getOpenFileName(this, tr("Choose File")); if (fileName.isEmpty()) return; QMimeDatabase mimeDatabase; const QFileInfo fi(fileName); const QMimeType mimeType = mimeDatabase.mimeTypeForFile(fi); const QModelIndex index = mimeType.isValid() ? m_model->indexForMimeType(mimeType.name()) : QModelIndex(); if (index.isValid()) { statusBar()->showMessage(tr("\"%1\" is of type \"%2\"").arg(fi.fileName(), mimeType.name())); selectAndGoTo(index); } else { QMessageBox::information(this, tr("Unknown File Type"), tr("The type of %1 could not be determined.") .arg(QDir::toNativeSeparators(fileName))); } } void MainWindow::updateFindActions() { const bool findNextPreviousEnabled = m_findMatches.size() > 1; m_findNextAction->setEnabled(findNextPreviousEnabled); m_findPreviousAction->setEnabled(findNextPreviousEnabled); } void MainWindow::findPrevious() { if (--m_findIndex < 0) m_findIndex = m_findMatches.size() - 1; if (m_findIndex >= 0) selectAndGoTo(m_findMatches.at(m_findIndex)); } void MainWindow::findNext() { if (++m_findIndex >= m_findMatches.size()) m_findIndex = 0; if (m_findIndex < m_findMatches.size()) selectAndGoTo(m_findMatches.at(m_findIndex)); } void MainWindow::find() { QInputDialog inputDialog(this); inputDialog.setWindowTitle(tr("Find")); inputDialog.setLabelText(tr("Text:")); if (inputDialog.exec() != QDialog::Accepted) return; const QString value = inputDialog.textValue().trimmed(); if (value.isEmpty()) return; m_findMatches.clear(); m_findIndex = 0; foreach (const QStandardItem *item, m_model->findItems(value, Qt::MatchContains | Qt::MatchFixedString | Qt::MatchRecursive)) m_findMatches.append(m_model->indexFromItem(item)); statusBar()->showMessage(tr("%n mime types match \"%1\".", 0, m_findMatches.size()).arg(value)); updateFindActions(); if (!m_findMatches.isEmpty()) selectAndGoTo(m_findMatches.constFirst()); }