qgsscreenhelper.h

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/***************************************************************************
     qgsscreenhelper.h
     ---------------
    Date                 : August 2022
    Copyright            : (C) 2022 by Nyall Dawson
    Email                : nyall dot dawson at gmail dot com
 ***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
#ifndef QGSSCREENHELPER_H
#define QGSSCREENHELPER_H
 
#include "qgis_gui.h"
#include "qgis_sip.h"
 
#include <QObject>
#include <QRect>
 
class QWidget;
class QScreen;
class QWindow;

class GUI_EXPORT QgsScreenHelper : public QObject
{
    Q_OBJECT
 
  public:
    QgsScreenHelper( QWidget *parent SIP_TRANSFERTHIS );

    QScreen *screen();

    QWindow *windowHandle();

    double screenDpi() const { return mScreenDpi; }

    QRect availableGeometry() const { return mAvailableGeometry; }
 
  signals:

    void screenDpiChanged( double dpi );

    void availableGeometryChanged( const QRect &geometry );
 
  protected:
    bool eventFilter( QObject *watched, QEvent *event ) override;
 
  private slots:
 
    void updateDevicePixelFromScreen();
    void updateAvailableGeometryFromScreen();
 
  private:
    QWidget *mWidget = nullptr;
 
    double mScreenDpi = 96.0;
    QMetaObject::Connection mScreenDpiChangedConnection;
 
    QRect mAvailableGeometry;
    QMetaObject::Connection mAvailableGeometryChangedConnection;
};
 
 
#endif // QGSSCREENHELPER_H