dialog.cpp Example File

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  #include <QtWidgets>

  #include "dialog.h"

  #define MESSAGE \
      Dialog::tr("<p>Message boxes have a caption, a text, " \
                 "and any number of buttons, each with standard or custom texts." \
                 "<p>Click a button to close the message box. Pressing the Esc button " \
                 "will activate the detected escape button (if any).")
  #define MESSAGE_DETAILS \
      Dialog::tr("If a message box has detailed text, the user can reveal it " \
                 "by pressing the Show Details... button.")

  class DialogOptionsWidget : public QGroupBox
  {
  public:
      explicit DialogOptionsWidget(QWidget *parent = 0);

      void addCheckBox(const QString &text, int value);
      void addSpacer();
      int value() const;

  private:
      typedef QPair<QCheckBox *, int> CheckBoxEntry;
      QVBoxLayout *layout;
      QList<CheckBoxEntry> checkBoxEntries;
  };

  DialogOptionsWidget::DialogOptionsWidget(QWidget *parent) :
      QGroupBox(parent) , layout(new QVBoxLayout)
  {
      setTitle(Dialog::tr("Options"));
      setLayout(layout);
  }

  void DialogOptionsWidget::addCheckBox(const QString &text, int value)
  {
      QCheckBox *checkBox = new QCheckBox(text);
      layout->addWidget(checkBox);
      checkBoxEntries.append(CheckBoxEntry(checkBox, value));
  }

  void DialogOptionsWidget::addSpacer()
  {
      layout->addItem(new QSpacerItem(0, 0, QSizePolicy::Ignored, QSizePolicy::MinimumExpanding));
  }

  int DialogOptionsWidget::value() const
  {
      int result = 0;
      foreach (const CheckBoxEntry &checkboxEntry, checkBoxEntries)
          if (checkboxEntry.first->isChecked())
              result |= checkboxEntry.second;
      return result;
  }

  Dialog::Dialog(QWidget *parent)
      : QWidget(parent)
  {
      QVBoxLayout *verticalLayout;
      if (QGuiApplication::styleHints()->showIsFullScreen() || QGuiApplication::styleHints()->showIsMaximized()) {
          QHBoxLayout *horizontalLayout = new QHBoxLayout(this);
          QGroupBox *groupBox = new QGroupBox(QGuiApplication::applicationDisplayName(), this);
          horizontalLayout->addWidget(groupBox);
          verticalLayout = new QVBoxLayout(groupBox);
      } else {
          verticalLayout = new QVBoxLayout(this);
      }

      QToolBox *toolbox = new QToolBox;
      verticalLayout->addWidget(toolbox);

      errorMessageDialog = new QErrorMessage(this);

      int frameStyle = QFrame::Sunken | QFrame::Panel;

      integerLabel = new QLabel;
      integerLabel->setFrameStyle(frameStyle);
      QPushButton *integerButton =
              new QPushButton(tr("QInputDialog::get&Int()"));

      doubleLabel = new QLabel;
      doubleLabel->setFrameStyle(frameStyle);
      QPushButton *doubleButton =
              new QPushButton(tr("QInputDialog::get&Double()"));

      itemLabel = new QLabel;
      itemLabel->setFrameStyle(frameStyle);
      QPushButton *itemButton = new QPushButton(tr("QInputDialog::getIte&m()"));

      textLabel = new QLabel;
      textLabel->setFrameStyle(frameStyle);
      QPushButton *textButton = new QPushButton(tr("QInputDialog::get&Text()"));

      multiLineTextLabel = new QLabel;
      multiLineTextLabel->setFrameStyle(frameStyle);
      QPushButton *multiLineTextButton = new QPushButton(tr("QInputDialog::get&MultiLineText()"));

      colorLabel = new QLabel;
      colorLabel->setFrameStyle(frameStyle);
      QPushButton *colorButton = new QPushButton(tr("QColorDialog::get&Color()"));

      fontLabel = new QLabel;
      fontLabel->setFrameStyle(frameStyle);
      QPushButton *fontButton = new QPushButton(tr("QFontDialog::get&Font()"));

      directoryLabel = new QLabel;
      directoryLabel->setFrameStyle(frameStyle);
      QPushButton *directoryButton =
              new QPushButton(tr("QFileDialog::getE&xistingDirectory()"));

      openFileNameLabel = new QLabel;
      openFileNameLabel->setFrameStyle(frameStyle);
      QPushButton *openFileNameButton =
              new QPushButton(tr("QFileDialog::get&OpenFileName()"));

      openFileNamesLabel = new QLabel;
      openFileNamesLabel->setFrameStyle(frameStyle);
      QPushButton *openFileNamesButton =
              new QPushButton(tr("QFileDialog::&getOpenFileNames()"));

      saveFileNameLabel = new QLabel;
      saveFileNameLabel->setFrameStyle(frameStyle);
      QPushButton *saveFileNameButton =
              new QPushButton(tr("QFileDialog::get&SaveFileName()"));

      criticalLabel = new QLabel;
      criticalLabel->setFrameStyle(frameStyle);
      QPushButton *criticalButton =
              new QPushButton(tr("QMessageBox::critica&l()"));

      informationLabel = new QLabel;
      informationLabel->setFrameStyle(frameStyle);
      QPushButton *informationButton =
              new QPushButton(tr("QMessageBox::i&nformation()"));

      questionLabel = new QLabel;
      questionLabel->setFrameStyle(frameStyle);
      QPushButton *questionButton =
              new QPushButton(tr("QMessageBox::&question()"));

      warningLabel = new QLabel;
      warningLabel->setFrameStyle(frameStyle);
      QPushButton *warningButton = new QPushButton(tr("QMessageBox::&warning()"));

      errorLabel = new QLabel;
      errorLabel->setFrameStyle(frameStyle);
      QPushButton *errorButton =
              new QPushButton(tr("QErrorMessage::showM&essage()"));

      connect(integerButton, &QAbstractButton::clicked, this, &Dialog::setInteger);
      connect(doubleButton, &QAbstractButton::clicked, this, &Dialog::setDouble);
      connect(itemButton, &QAbstractButton::clicked, this, &Dialog::setItem);
      connect(textButton, &QAbstractButton::clicked, this, &Dialog::setText);
      connect(multiLineTextButton, &QAbstractButton::clicked, this, &Dialog::setMultiLineText);
      connect(colorButton, &QAbstractButton::clicked, this, &Dialog::setColor);
      connect(fontButton, &QAbstractButton::clicked, this, &Dialog::setFont);
      connect(directoryButton, &QAbstractButton::clicked,
              this, &Dialog::setExistingDirectory);
      connect(openFileNameButton, &QAbstractButton::clicked,
              this, &Dialog::setOpenFileName);
      connect(openFileNamesButton, &QAbstractButton::clicked,
              this, &Dialog::setOpenFileNames);
      connect(saveFileNameButton, &QAbstractButton::clicked,
              this, &Dialog::setSaveFileName);
      connect(criticalButton, &QAbstractButton::clicked, this, &Dialog::criticalMessage);
      connect(informationButton, &QAbstractButton::clicked,
              this, &Dialog::informationMessage);
      connect(questionButton, &QAbstractButton::clicked, this, &Dialog::questionMessage);
      connect(warningButton, &QAbstractButton::clicked, this, &Dialog::warningMessage);
      connect(errorButton, &QAbstractButton::clicked, this, &Dialog::errorMessage);

      QWidget *page = new QWidget;
      QGridLayout *layout = new QGridLayout(page);
      layout->setColumnStretch(1, 1);
      layout->setColumnMinimumWidth(1, 250);
      layout->addWidget(integerButton, 0, 0);
      layout->addWidget(integerLabel, 0, 1);
      layout->addWidget(doubleButton, 1, 0);
      layout->addWidget(doubleLabel, 1, 1);
      layout->addWidget(itemButton, 2, 0);
      layout->addWidget(itemLabel, 2, 1);
      layout->addWidget(textButton, 3, 0);
      layout->addWidget(textLabel, 3, 1);
      layout->addWidget(multiLineTextButton, 4, 0);
      layout->addWidget(multiLineTextLabel, 4, 1);
      layout->addItem(new QSpacerItem(0, 0, QSizePolicy::Ignored, QSizePolicy::MinimumExpanding), 5, 0);
      toolbox->addItem(page, tr("Input Dialogs"));

      const QString doNotUseNativeDialog = tr("Do not use native dialog");

      page = new QWidget;
      layout = new QGridLayout(page);
      layout->setColumnStretch(1, 1);
      layout->addWidget(colorButton, 0, 0);
      layout->addWidget(colorLabel, 0, 1);
      colorDialogOptionsWidget = new DialogOptionsWidget;
      colorDialogOptionsWidget->addCheckBox(doNotUseNativeDialog, QColorDialog::DontUseNativeDialog);
      colorDialogOptionsWidget->addCheckBox(tr("Show alpha channel") , QColorDialog::ShowAlphaChannel);
      colorDialogOptionsWidget->addCheckBox(tr("No buttons") , QColorDialog::NoButtons);
      layout->addItem(new QSpacerItem(0, 0, QSizePolicy::Ignored, QSizePolicy::MinimumExpanding), 1, 0);
      layout->addWidget(colorDialogOptionsWidget, 2, 0, 1 ,2);

      toolbox->addItem(page, tr("Color Dialog"));

      page = new QWidget;
      layout = new QGridLayout(page);
      layout->setColumnStretch(1, 1);
      layout->addWidget(fontButton, 0, 0);
      layout->addWidget(fontLabel, 0, 1);
      fontDialogOptionsWidget = new DialogOptionsWidget;
      fontDialogOptionsWidget->addCheckBox(doNotUseNativeDialog, QFontDialog::DontUseNativeDialog);
      fontDialogOptionsWidget->addCheckBox(tr("Show scalable fonts"), QFontDialog::ScalableFonts);
      fontDialogOptionsWidget->addCheckBox(tr("Show non scalable fonts"), QFontDialog::NonScalableFonts);
      fontDialogOptionsWidget->addCheckBox(tr("Show monospaced fonts"), QFontDialog::MonospacedFonts);
      fontDialogOptionsWidget->addCheckBox(tr("Show proportional fonts"), QFontDialog::ProportionalFonts);
      fontDialogOptionsWidget->addCheckBox(tr("No buttons") , QFontDialog::NoButtons);
      layout->addItem(new QSpacerItem(0, 0, QSizePolicy::Ignored, QSizePolicy::MinimumExpanding), 1, 0);
      layout->addWidget(fontDialogOptionsWidget, 2, 0, 1 ,2);
      toolbox->addItem(page, tr("Font Dialog"));

      page = new QWidget;
      layout = new QGridLayout(page);
      layout->setColumnStretch(1, 1);
      layout->addWidget(directoryButton, 0, 0);
      layout->addWidget(directoryLabel, 0, 1);
      layout->addWidget(openFileNameButton, 1, 0);
      layout->addWidget(openFileNameLabel, 1, 1);
      layout->addWidget(openFileNamesButton, 2, 0);
      layout->addWidget(openFileNamesLabel, 2, 1);
      layout->addWidget(saveFileNameButton, 3, 0);
      layout->addWidget(saveFileNameLabel, 3, 1);
      fileDialogOptionsWidget = new DialogOptionsWidget;
      fileDialogOptionsWidget->addCheckBox(doNotUseNativeDialog, QFileDialog::DontUseNativeDialog);
      fileDialogOptionsWidget->addCheckBox(tr("Show directories only"), QFileDialog::ShowDirsOnly);
      fileDialogOptionsWidget->addCheckBox(tr("Do not resolve symlinks"), QFileDialog::DontResolveSymlinks);
      fileDialogOptionsWidget->addCheckBox(tr("Do not confirm overwrite"), QFileDialog::DontConfirmOverwrite);
      fileDialogOptionsWidget->addCheckBox(tr("Do not use sheet"), QFileDialog::DontUseSheet);
      fileDialogOptionsWidget->addCheckBox(tr("Readonly"), QFileDialog::ReadOnly);
      fileDialogOptionsWidget->addCheckBox(tr("Hide name filter details"), QFileDialog::HideNameFilterDetails);
      fileDialogOptionsWidget->addCheckBox(tr("Do not use custom directory icons (Windows)"), QFileDialog::DontUseCustomDirectoryIcons);
      layout->addItem(new QSpacerItem(0, 0, QSizePolicy::Ignored, QSizePolicy::MinimumExpanding), 4, 0);
      layout->addWidget(fileDialogOptionsWidget, 5, 0, 1 ,2);
      toolbox->addItem(page, tr("File Dialogs"));

      page = new QWidget;
      layout = new QGridLayout(page);
      layout->setColumnStretch(1, 1);
      layout->addWidget(criticalButton, 0, 0);
      layout->addWidget(criticalLabel, 0, 1);
      layout->addWidget(informationButton, 1, 0);
      layout->addWidget(informationLabel, 1, 1);
      layout->addWidget(questionButton, 2, 0);
      layout->addWidget(questionLabel, 2, 1);
      layout->addWidget(warningButton, 3, 0);
      layout->addWidget(warningLabel, 3, 1);
      layout->addWidget(errorButton, 4, 0);
      layout->addWidget(errorLabel, 4, 1);
      layout->addItem(new QSpacerItem(0, 0, QSizePolicy::Ignored, QSizePolicy::MinimumExpanding), 5, 0);
      toolbox->addItem(page, tr("Message Boxes"));

      setWindowTitle(QGuiApplication::applicationDisplayName());
  }

  void Dialog::setInteger()
  {
      bool ok;
      int i = QInputDialog::getInt(this, tr("QInputDialog::getInteger()"),
                                   tr("Percentage:"), 25, 0, 100, 1, &ok);
      if (ok)
          integerLabel->setText(tr("%1%").arg(i));
  }

  void Dialog::setDouble()
  {
      bool ok;
      double d = QInputDialog::getDouble(this, tr("QInputDialog::getDouble()"),
                                         tr("Amount:"), 37.56, -10000, 10000, 2, &ok);
      if (ok)
          doubleLabel->setText(QString("$%1").arg(d));
  }

  void Dialog::setItem()
  {
      QStringList items;
      items << tr("Spring") << tr("Summer") << tr("Fall") << tr("Winter");

      bool ok;
      QString item = QInputDialog::getItem(this, tr("QInputDialog::getItem()"),
                                           tr("Season:"), items, 0, false, &ok);
      if (ok && !item.isEmpty())
          itemLabel->setText(item);
  }

  void Dialog::setText()
  {
      bool ok;
      QString text = QInputDialog::getText(this, tr("QInputDialog::getText()"),
                                           tr("User name:"), QLineEdit::Normal,
                                           QDir::home().dirName(), &ok);
      if (ok && !text.isEmpty())
          textLabel->setText(text);
  }

  void Dialog::setMultiLineText()
  {
      bool ok;
      QString text = QInputDialog::getMultiLineText(this, tr("QInputDialog::getMultiLineText()"),
                                                    tr("Address:"), "John Doe\nFreedom Street", &ok);
      if (ok && !text.isEmpty())
          multiLineTextLabel->setText(text);
  }

  void Dialog::setColor()
  {
      const QColorDialog::ColorDialogOptions options = QFlag(colorDialogOptionsWidget->value());
      const QColor color = QColorDialog::getColor(Qt::green, this, "Select Color", options);

      if (color.isValid()) {
          colorLabel->setText(color.name());
          colorLabel->setPalette(QPalette(color));
          colorLabel->setAutoFillBackground(true);
      }
  }

  void Dialog::setFont()
  {
      const QFontDialog::FontDialogOptions options = QFlag(fontDialogOptionsWidget->value());
      bool ok;
      QFont font = QFontDialog::getFont(&ok, QFont(fontLabel->text()), this, "Select Font", options);
      if (ok) {
          fontLabel->setText(font.key());
          fontLabel->setFont(font);
      }
  }

  void Dialog::setExistingDirectory()
  {
      QFileDialog::Options options = QFlag(fileDialogOptionsWidget->value());
      options |= QFileDialog::DontResolveSymlinks | QFileDialog::ShowDirsOnly;
      QString directory = QFileDialog::getExistingDirectory(this,
                                  tr("QFileDialog::getExistingDirectory()"),
                                  directoryLabel->text(),
                                  options);
      if (!directory.isEmpty())
          directoryLabel->setText(directory);
  }

  void Dialog::setOpenFileName()
  {
      const QFileDialog::Options options = QFlag(fileDialogOptionsWidget->value());
      QString selectedFilter;
      QString fileName = QFileDialog::getOpenFileName(this,
                                  tr("QFileDialog::getOpenFileName()"),
                                  openFileNameLabel->text(),
                                  tr("All Files (*);;Text Files (*.txt)"),
                                  &selectedFilter,
                                  options);
      if (!fileName.isEmpty())
          openFileNameLabel->setText(fileName);
  }

  void Dialog::setOpenFileNames()
  {
      const QFileDialog::Options options = QFlag(fileDialogOptionsWidget->value());
      QString selectedFilter;
      QStringList files = QFileDialog::getOpenFileNames(
                                  this, tr("QFileDialog::getOpenFileNames()"),
                                  openFilesPath,
                                  tr("All Files (*);;Text Files (*.txt)"),
                                  &selectedFilter,
                                  options);
      if (files.count()) {
          openFilesPath = files[0];
          openFileNamesLabel->setText(QString("[%1]").arg(files.join(", ")));
      }
  }

  void Dialog::setSaveFileName()
  {
      const QFileDialog::Options options = QFlag(fileDialogOptionsWidget->value());
      QString selectedFilter;
      QString fileName = QFileDialog::getSaveFileName(this,
                                  tr("QFileDialog::getSaveFileName()"),
                                  saveFileNameLabel->text(),
                                  tr("All Files (*);;Text Files (*.txt)"),
                                  &selectedFilter,
                                  options);
      if (!fileName.isEmpty())
          saveFileNameLabel->setText(fileName);
  }

  void Dialog::criticalMessage()
  {
      QMessageBox::StandardButton reply;
      reply = QMessageBox::critical(this, tr("QMessageBox::critical()"),
                                      MESSAGE,
                                      QMessageBox::Abort | QMessageBox::Retry | QMessageBox::Ignore);
      if (reply == QMessageBox::Abort)
          criticalLabel->setText(tr("Abort"));
      else if (reply == QMessageBox::Retry)
          criticalLabel->setText(tr("Retry"));
      else
          criticalLabel->setText(tr("Ignore"));
  }

  void Dialog::informationMessage()
  {
      QMessageBox::StandardButton reply;
      reply = QMessageBox::information(this, tr("QMessageBox::information()"), MESSAGE);
      if (reply == QMessageBox::Ok)
          informationLabel->setText(tr("OK"));
      else
          informationLabel->setText(tr("Escape"));
  }

  void Dialog::questionMessage()
  {
      QMessageBox::StandardButton reply;
      reply = QMessageBox::question(this, tr("QMessageBox::question()"),
                                      MESSAGE,
                                      QMessageBox::Yes | QMessageBox::No | QMessageBox::Cancel);
      if (reply == QMessageBox::Yes)
          questionLabel->setText(tr("Yes"));
      else if (reply == QMessageBox::No)
          questionLabel->setText(tr("No"));
      else
          questionLabel->setText(tr("Cancel"));
  }

  void Dialog::warningMessage()
  {
      QMessageBox msgBox(QMessageBox::Warning, tr("QMessageBox::warning()"),
                         MESSAGE, 0, this);
      msgBox.setDetailedText(MESSAGE_DETAILS);
      msgBox.addButton(tr("Save &Again"), QMessageBox::AcceptRole);
      msgBox.addButton(tr("&Continue"), QMessageBox::RejectRole);
      if (msgBox.exec() == QMessageBox::AcceptRole)
          warningLabel->setText(tr("Save Again"));
      else
          warningLabel->setText(tr("Continue"));

  }

  void Dialog::errorMessage()
  {
      errorMessageDialog->showMessage(
              tr("This dialog shows and remembers error messages. "
                 "If the checkbox is checked (as it is by default), "
                 "the shown message will be shown again, "
                 "but if the user unchecks the box the message "
                 "will not appear again if QErrorMessage::showMessage() "
                 "is called with the same message."));
      errorLabel->setText(tr("If the box is unchecked, the message "
                             "won't appear again."));
  }