stylesheetdialog.cpp Example File

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  #include "mainwindow.h"
  #include "stylesheetdialog.h"
  #include "ui_stylesheetdialog.h"

  StylesheetDialog::StylesheetDialog(QWidget *parent) :
      QDialog(parent),
      ui(new Ui::StylesheetDialog)
  {
      ui->setupUi(this);

      connect(ui->styleSheetList, &QListWidget::currentItemChanged, this, &StylesheetDialog::currentStyleSheetChanged);
      connect(ui->styleSheetList, &QListWidget::itemClicked, this, &StylesheetDialog::listItemClicked);
      connect(ui->fileNameEdit, &QLineEdit::textChanged, this, &StylesheetDialog::fileNameChanged);

      connect(ui->addButton, &QPushButton::clicked, this, &StylesheetDialog::addButtonClicked);
      connect(ui->removeButton, &QPushButton::clicked, this, &StylesheetDialog::removeButtonClicked);

      QSettings settings;
      settings.beginGroup("styleSheets");
      for (auto name : settings.allKeys()) {
          QListWidgetItem *listItem = new QListWidgetItem(name,  ui->styleSheetList);
          listItem->setFlags(listItem->flags() | Qt::ItemIsUserCheckable);
          bool checked = settings.value(name).value<StyleSheet>().second;
          listItem->setCheckState(checked ? Qt::Checked : Qt::Unchecked);
      }
      settings.endGroup();
  }

  StylesheetDialog::~StylesheetDialog()
  {
      delete ui;
  }

  void StylesheetDialog::currentStyleSheetChanged(QListWidgetItem *current, QListWidgetItem *previous)
  {
      if (!previous) {
          // Select the first item on startup
          ui->styleSheetList->setCurrentItem(current);
      }

      if (!current) {
          ui->fileNameEdit->setText(QString());
          ui->sourceCodeEdit->setPlainText(QString());
          return;
      }

      QSettings settings;
      settings.beginGroup("styleSheets");
      ui->fileNameEdit->setText(current->text());
      const QString source = settings.value(current->text()).value<StyleSheet>().first;
      ui->sourceCodeEdit->setPlainText(source);
      settings.endGroup();
  }

  void StylesheetDialog::listItemClicked(QListWidgetItem *item)
  {
      MainWindow *window = static_cast<MainWindow *>(parent());
      const QString name = item->text();
      bool checkedStateChanged =
              (item->checkState() == Qt::Checked && !window->hasStyleSheet(name)) ||
              (item->checkState() == Qt::Unchecked && window->hasStyleSheet(name));
      if (!checkedStateChanged)
          return;

      QSettings settings;
      settings.beginGroup("styleSheets");
      const QString source = settings.value(name).value<StyleSheet>().first;

      if (item->checkState() == Qt::Checked) {
          settings.setValue(name, QVariant::fromValue(qMakePair(source, true)));
          window->insertStyleSheet(name, source, true);
      } else {
          settings.setValue(name, QVariant::fromValue(qMakePair(source, false)));
          window->removeStyleSheet(name, true);
      }

      settings.endGroup();
  }

  void StylesheetDialog::fileNameChanged(const QString &text)
  {
      QList<QListWidgetItem *> items = ui->styleSheetList->findItems(text, Qt::MatchFixedString);
      if (items.size())
          ui->addButton->setEnabled(false);
      else
          ui->addButton->setEnabled(true);
  }

  void StylesheetDialog::addButtonClicked()
  {
      const QString name = ui->fileNameEdit->text();
      const QString source = ui->sourceCodeEdit->toPlainText();
      if (name.isEmpty() || source.isEmpty())
          return;

      QListWidgetItem *listItem = new QListWidgetItem(ui->fileNameEdit->text(),  ui->styleSheetList);
      listItem->setFlags(listItem->flags() | Qt::ItemIsUserCheckable);
      listItem->setCheckState(Qt::Checked);

      MainWindow *window = static_cast<MainWindow *>(parent());
      window->insertStyleSheet(name, source, true);

      QSettings settings;
      settings.beginGroup("styleSheets");
      settings.setValue(name, QVariant::fromValue(qMakePair(source, true)));
      settings.endGroup();

      ui->addButton->setEnabled(false);
  }

  void StylesheetDialog::removeButtonClicked()
  {
      if (ui->styleSheetList->selectedItems().isEmpty())
          return;

      MainWindow *window = static_cast<MainWindow *>(parent());
      QSettings settings;
      settings.beginGroup("styleSheets");

      QListWidgetItem *item = ui->styleSheetList->selectedItems().first();
      const QString name = item->text();
      window->removeStyleSheet(name, true);
      settings.remove(name);
      delete item;

      settings.endGroup();
  }