common/include/QtWidgets/qdesktopwidget.h

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#ifndef QDESKTOPWIDGET_H
#define QDESKTOPWIDGET_H

#include <QtWidgets/qwidget.h>

QT_BEGIN_NAMESPACE


class QApplication;
class QDesktopWidgetPrivate;

class Q_WIDGETS_EXPORT QDesktopWidget : public QWidget
{
    Q_OBJECT
    Q_PROPERTY(bool virtualDesktop READ isVirtualDesktop)
    Q_PROPERTY(int screenCount READ screenCount NOTIFY screenCountChanged)
    Q_PROPERTY(int primaryScreen READ primaryScreen)
public:
    QDesktopWidget();
    ~QDesktopWidget();

    bool isVirtualDesktop() const;

    int numScreens() const;
    int screenCount() const;
    int primaryScreen() const;

    int screenNumber(const QWidget *widget = 0) const;
    int screenNumber(const QPoint &) const;

    QWidget *screen(int screen = -1);

    const QRect screenGeometry(int screen = -1) const;
    const QRect screenGeometry(const QWidget *widget) const;
    const QRect screenGeometry(const QPoint &point) const
    { return screenGeometry(screenNumber(point)); }

    const QRect availableGeometry(int screen = -1) const;
    const QRect availableGeometry(const QWidget *widget) const;
    const QRect availableGeometry(const QPoint &point) const
    { return availableGeometry(screenNumber(point)); }

Q_SIGNALS:
    void resized(int);
    void workAreaResized(int);
    void screenCountChanged(int);

protected:
    void resizeEvent(QResizeEvent *e) Q_DECL_OVERRIDE;

private:
    Q_DISABLE_COPY(QDesktopWidget)
    Q_DECLARE_PRIVATE(QDesktopWidget)
    Q_PRIVATE_SLOT(d_func(), void _q_updateScreens())
    Q_PRIVATE_SLOT(d_func(), void _q_availableGeometryChanged())

    friend class QApplication;
    friend class QApplicationPrivate;
};

inline int QDesktopWidget::screenCount() const
{ return numScreens(); }

QT_END_NAMESPACE

#endif // QDESKTOPWIDGET_H