centralwidget.h

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#ifndef CENTRALWIDGET_H
#define CENTRALWIDGET_H

#include <find/ifindsupport.h>

#include <QtGui/QWidget>

QT_FORWARD_DECLARE_CLASS(QEvent)
QT_FORWARD_DECLARE_CLASS(QAction)
QT_FORWARD_DECLARE_CLASS(QStackedWidget)
QT_FORWARD_DECLARE_CLASS(QFocusEvent)

namespace Help {
    namespace Internal {

class HelpViewer;
class PrintHelper;

class CentralWidget : public QWidget
{
    Q_OBJECT

public:
    CentralWidget(QWidget *parent = 0);
    ~CentralWidget();

    static CentralWidget *instance();

    bool hasSelection() const;
    bool isForwardAvailable() const;
    bool isBackwardAvailable() const;

    HelpViewer *viewerAt(int index) const;
    HelpViewer *currentHelpViewer() const;

    void addPage(HelpViewer *page, bool fromSearch = false);
    void removePage(int index);

    int currentIndex() const;
    void setCurrentPage(HelpViewer *page);

    bool find(const QString &txt, Find::FindFlags findFlags,
        bool incremental);

public slots:
    void copy();
    void home();

    void zoomIn();
    void zoomOut();
    void resetZoom();

    void forward();
    void nextPage();

    void backward();
    void previousPage();

    void print();
    void pageSetup();
    void printPreview();

    void setSource(const QUrl &url);
    void setSourceFromSearch(const QUrl &url);
    void showTopicChooser(const QMap<QString, QUrl> &links, const QString &key);

protected:
    void focusInEvent(QFocusEvent *event);

signals:
    void currentViewerChanged();
    void sourceChanged(const QUrl &url);
    void forwardAvailable(bool available);
    void backwardAvailable(bool available);

private slots:
    void highlightSearchTerms();
    void printPreview(QPrinter *printer);
    void handleSourceChanged(const QUrl &url);

private:
    void initPrinter();
    void connectSignals(HelpViewer *page);
    bool eventFilter(QObject *object, QEvent *e);

private:
    QPrinter *printer;
    QStackedWidget *m_stackedWidget;
};

    } // namespace Internal
} // namespace Help

#endif  // CENTRALWIDGET_H