filterwidget.cpp Example File

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  #include "filterwidget.h"

  #include <QIcon>
  #include <QPixmap>
  #include <QImage>
  #include <QMenu>
  #include <QAction>
  #include <QActionGroup>
  #include <QToolButton>
  #include <QWidgetAction>
  #include <QDebug>

  FilterWidget::FilterWidget(QWidget *parent)
      : QLineEdit(parent)
      , m_patternGroup(new QActionGroup(this))
  {
      setClearButtonEnabled(true);
      connect(this, &QLineEdit::textChanged, this, &FilterWidget::filterChanged);

      QMenu *menu = new QMenu(this);
      m_caseSensitivityAction = menu->addAction(tr("Case Sensitive"));
      m_caseSensitivityAction->setCheckable(true);
      connect(m_caseSensitivityAction, &QAction::toggled, this, &FilterWidget::filterChanged);

      menu->addSeparator();
      m_patternGroup->setExclusive(true);
      QAction *patternAction = menu->addAction("Fixed String");
      patternAction->setData(QVariant(int(QRegExp::FixedString)));
      patternAction->setCheckable(true);
      patternAction->setChecked(true);
      m_patternGroup->addAction(patternAction);
      patternAction = menu->addAction("Regular Expression");
      patternAction->setCheckable(true);
      patternAction->setData(QVariant(int(QRegExp::RegExp2)));
      m_patternGroup->addAction(patternAction);
      patternAction = menu->addAction("Wildcard");
      patternAction->setCheckable(true);
      patternAction->setData(QVariant(int(QRegExp::Wildcard)));
      m_patternGroup->addAction(patternAction);
      connect(m_patternGroup, &QActionGroup::triggered, this, &FilterWidget::filterChanged);

      const QIcon icon = QIcon(QPixmap(":/images/find.png"));
      QToolButton *optionsButton = new QToolButton;
  #ifndef QT_NO_CURSOR
      optionsButton->setCursor(Qt::ArrowCursor);
  #endif
      optionsButton->setFocusPolicy(Qt::NoFocus);
      optionsButton->setStyleSheet("* { border: none; }");
      optionsButton->setIcon(icon);
      optionsButton->setMenu(menu);
      optionsButton->setPopupMode(QToolButton::InstantPopup);

      QWidgetAction *optionsAction = new QWidgetAction(this);
      optionsAction->setDefaultWidget(optionsButton);
      addAction(optionsAction, QLineEdit::LeadingPosition);
  }

  Qt::CaseSensitivity FilterWidget::caseSensitivity() const
  {
      return m_caseSensitivityAction->isChecked() ? Qt::CaseSensitive : Qt::CaseInsensitive;
  }

  void FilterWidget::setCaseSensitivity(Qt::CaseSensitivity cs)
  {
      m_caseSensitivityAction->setChecked(cs == Qt::CaseSensitive);
  }

  static inline QRegExp::PatternSyntax patternSyntaxFromAction(const QAction *a)
  {
      return static_cast<QRegExp::PatternSyntax>(a->data().toInt());
  }

  QRegExp::PatternSyntax FilterWidget::patternSyntax() const
  {
      return patternSyntaxFromAction(m_patternGroup->checkedAction());
  }

  void FilterWidget::setPatternSyntax(QRegExp::PatternSyntax s)
  {
      foreach (QAction *a, m_patternGroup->actions()) {
          if (patternSyntaxFromAction(a) == s) {
              a->setChecked(true);
              break;
          }
      }
  }