Qt 5.9 | Qt Assistant Manual | Simple Text Viewer Example | findfiledialog.cpp Example File

Qt 5.9.2 Reference Documentation

# findfiledialog.cpp Example File

simpletextviewer/findfiledialog.cpp

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      #include <QtCore/QDir>
      #include <QtWidgets/QLayout>
      #include <QtWidgets/QComboBox>
      #include <QtWidgets/QTreeWidget>
      #include <QtWidgets/QLayout>
      #include <QtWidgets/QFileDialog>
      #include <QtWidgets/QDialogButtonBox>
      #include <QtWidgets/QToolButton>
      #include <QtWidgets/QPushButton>
      #include <QtWidgets/QLabel>

      #include "findfiledialog.h"
      #include "assistant.h"
      #include "textedit.h"

      FindFileDialog::FindFileDialog(TextEdit *editor, Assistant *assistant)
          : QDialog(editor)
      {
          currentAssistant = assistant;
          currentEditor = editor;

          createButtons();
          createComboBoxes();
          createFilesTree();
          createLabels();
          createLayout();

          directoryComboBox->addItem(QDir::toNativeSeparators(QDir::currentPath()));
          fileNameComboBox->addItem("*");
          findFiles();

          setWindowTitle(tr("Find File"));
      }

      void FindFileDialog::browse()
      {
          QString currentDirectory = directoryComboBox->currentText();
          QString newDirectory = QFileDialog::getExistingDirectory(this,
                                     tr("Select Directory"), currentDirectory);
          if (!newDirectory.isEmpty()) {
              directoryComboBox->addItem(QDir::toNativeSeparators(newDirectory));
              directoryComboBox->setCurrentIndex(directoryComboBox->count() - 1);
              update();
          }
      }

      void FindFileDialog::help()
      {
          currentAssistant->showDocumentation("filedialog.html");
      }

      void FindFileDialog::openFile(QTreeWidgetItem *item)
      {
          if (!item) {
              item = foundFilesTree->currentItem();
              if (!item)
                  return;
          }

          QString fileName = item->text(0);
          QString path = directoryComboBox->currentText() + QDir::separator();

          currentEditor->setContents(path + fileName);
          close();
      }

      void FindFileDialog::update()
      {
          findFiles();
          buttonBox->button(QDialogButtonBox::Open)->setEnabled(
                  foundFilesTree->topLevelItemCount() > 0);
      }

      void FindFileDialog::findFiles()
      {
          QRegExp filePattern(fileNameComboBox->currentText() + "*");
          filePattern.setPatternSyntax(QRegExp::Wildcard);

          QDir directory(directoryComboBox->currentText());

          const QStringList allFiles = directory.entryList(QDir::Files | QDir::NoSymLinks);
          QStringList matchingFiles;

          for (const QString &file : allFiles) {
              if (filePattern.exactMatch(file))
                  matchingFiles << file;
          }
          showFiles(matchingFiles);
      }

      void FindFileDialog::showFiles(const QStringList &files)
      {
          foundFilesTree->clear();

          for (int i = 0; i < files.count(); ++i) {
              QTreeWidgetItem *item = new QTreeWidgetItem(foundFilesTree);
              item->setText(0, files[i]);
          }

          if (files.count() > 0)
              foundFilesTree->setCurrentItem(foundFilesTree->topLevelItem(0));
      }

      void FindFileDialog::createButtons()
      {
          browseButton = new QToolButton;
          browseButton->setText(tr("..."));
          connect(browseButton, SIGNAL(clicked()), this, SLOT(browse()));

          buttonBox = new QDialogButtonBox(QDialogButtonBox::Open
                                           | QDialogButtonBox::Cancel
                                           | QDialogButtonBox::Help);
          connect(buttonBox, SIGNAL(accepted()), this, SLOT(openFile()));
          connect(buttonBox, SIGNAL(rejected()), this, SLOT(reject()));
          connect(buttonBox, SIGNAL(helpRequested()), this, SLOT(help()));
      }

      void FindFileDialog::createComboBoxes()
      {
          directoryComboBox = new QComboBox;
          fileNameComboBox = new QComboBox;

          fileNameComboBox->setEditable(true);
          fileNameComboBox->setSizePolicy(QSizePolicy::Expanding,
                                          QSizePolicy::Preferred);

          directoryComboBox->setMinimumContentsLength(30);
          directoryComboBox->setSizeAdjustPolicy(
                  QComboBox::AdjustToMinimumContentsLength);
          directoryComboBox->setSizePolicy(QSizePolicy::Expanding,
                                           QSizePolicy::Preferred);

          connect(fileNameComboBox, SIGNAL(editTextChanged(QString)),
                  this, SLOT(update()));
          connect(directoryComboBox, SIGNAL(currentIndexChanged(QString)),
                  this, SLOT(update()));
      }

      void FindFileDialog::createFilesTree()
      {
          foundFilesTree = new QTreeWidget;
          foundFilesTree->setColumnCount(1);
          foundFilesTree->setHeaderLabels(QStringList(tr("Matching Files")));
          foundFilesTree->setRootIsDecorated(false);
          foundFilesTree->setSelectionMode(QAbstractItemView::SingleSelection);

          connect(foundFilesTree, SIGNAL(itemActivated(QTreeWidgetItem*,int)),
                  this, SLOT(openFile(QTreeWidgetItem*)));
      }

      void FindFileDialog::createLabels()
      {
          directoryLabel = new QLabel(tr("Search in:"));
          fileNameLabel = new QLabel(tr("File name (including wildcards):"));
      }

      void FindFileDialog::createLayout()
      {
          QHBoxLayout *fileLayout = new QHBoxLayout;
          fileLayout->addWidget(fileNameLabel);
          fileLayout->addWidget(fileNameComboBox);

          QHBoxLayout *directoryLayout = new QHBoxLayout;
          directoryLayout->addWidget(directoryLabel);
          directoryLayout->addWidget(directoryComboBox);
          directoryLayout->addWidget(browseButton);

          QVBoxLayout *mainLayout = new QVBoxLayout;
          mainLayout->addLayout(fileLayout);
          mainLayout->addLayout(directoryLayout);
          mainLayout->addWidget(foundFilesTree);
          mainLayout->addStretch();
          mainLayout->addWidget(buttonBox);
          setLayout(mainLayout);
      }