findfiledialog.cpp Example File

  /****************************************************************************
  **
  ** Copyright (C) 2017 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of the examples of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
  ** Commercial License Usage
  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
  ** Software or, alternatively, in accordance with the terms contained in
  ** a written agreement between you and The Qt Company. For licensing terms
  ** and conditions see https://www.qt.io/terms-conditions. For further
  ** information use the contact form at https://www.qt.io/contact-us.
  **
  ** BSD License Usage
  ** Alternatively, you may use this file under the terms of the BSD license
  ** as follows:
  **
  ** "Redistribution and use in source and binary forms, with or without
  ** modification, are permitted provided that the following conditions are
  ** met:
  **   * Redistributions of source code must retain the above copyright
  **     notice, this list of conditions and the following disclaimer.
  **   * Redistributions in binary form must reproduce the above copyright
  **     notice, this list of conditions and the following disclaimer in
  **     the documentation and/or other materials provided with the
  **     distribution.
  **   * Neither the name of The Qt Company Ltd nor the names of its
  **     contributors may be used to endorse or promote products derived
  **     from this software without specific prior written permission.
  **
  **
  ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/

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

  #include <QComboBox>
  #include <QDialogButtonBox>
  #include <QDir>
  #include <QFileDialog>
  #include <QHBoxLayout>
  #include <QLabel>
  #include <QPushButton>
  #include <QToolButton>
  #include <QTreeWidget>
  #include <QTreeWidgetItem>

  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);
  }