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;
         }
     }
 }