helpviewer.h

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
 
#ifndef HELPVIEWER_H
#define HELPVIEWER_H
 
#include <QtCore/qglobal.h>
#include <QtCore/QUrl>
 
#include <QtGui/QFont>
#include <QtGui/QTextDocument>
 
#if defined(QT_PRINTSUPPORT_LIB) && !defined(QT_NO_PRINTER)
#include <QtPrintSupport/QPrinter>
#endif
 
#include <QtWidgets/QWidget>
 
QT_BEGIN_NAMESPACE
 
class HelpViewerPrivate;
 
class HelpViewer : public QWidget
{
    Q_OBJECT
public:
    enum FindFlag {
        FindBackward = 0x01,
        FindCaseSensitively = 0x02
    };
    Q_DECLARE_FLAGS(FindFlags, FindFlag)
 
    HelpViewer(qreal zoom, QWidget *parent = nullptr);
    ~HelpViewer() override;
 
    QFont viewerFont() const;
    void setViewerFont(const QFont &font);
 
    void scaleUp();
    void scaleDown();
 
    void resetScale();
    qreal scale() const;
 
    QString title() const;
 
    QUrl source() const;
    void reload();
    void setSource(const QUrl &url);
 
    void doSetFocus();
 
#if defined(QT_PRINTSUPPORT_LIB) && !defined(QT_NO_PRINTER)
    void print(QPrinter *printer);
#endif
 
    QString selectedText() const;
    bool isForwardAvailable() const;
    bool isBackwardAvailable() const;
 
    bool findText(const QString &text, FindFlags flags, bool incremental,
        bool fromSearch);
 
    static bool isLocalUrl(const QUrl &url);
    static bool canOpenPage(const QString &url);
    static QString mimeFromUrl(const QUrl &url);
    static bool launchWithExternalApp(const QUrl &url);
 
    // implementation detail, not a part of the interface
    bool eventFilter(QObject *src, QEvent *event) override;
 
public slots:
#if QT_CONFIG(clipboard)
    void copy();
#endif
    void home();
    void forward();
    void backward();
 
signals:
    void titleChanged();
    void copyAvailable(bool yes);
    void sourceChanged(const QUrl &url);
    void forwardAvailable(bool enabled);
    void backwardAvailable(bool enabled);
    void highlighted(const QUrl &link);
    void printRequested();
    void loadFinished();
private:
    void doSetSource(const QUrl &url, bool reload);
 
    HelpViewerPrivate *d;
};
 
QT_END_NAMESPACE
 
#endif  // HELPVIEWER_H