- Qt 5.5
- Qt Widgets
- Custom Sort/Filter Model Example
- filterwidget.cpp Example File
- Qt 5.5.1 Reference Documentation

# filterwidget.cpp Example File

itemviews/customsortfiltermodel/filterwidget.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the examples of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** You may use this file under the terms of the BSD license as follows:
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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, SIGNAL(textChanged(QString)), this, SIGNAL(filterChanged()));

        QMenu *menu = new QMenu(this);
        m_caseSensitivityAction = menu->addAction(tr("Case Sensitive"));
        m_caseSensitivityAction->setCheckable(true);
        connect(m_caseSensitivityAction, SIGNAL(toggled(bool)), this, SIGNAL(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, SIGNAL(triggered(QAction*)), this, SIGNAL(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;
            }
        }
    }