qgsratiolockbutton.h

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/***************************************************************************
    qgsratiolockbutton.cpp - Lock button
     --------------------------------------
    Date                 : July, 2017
    Copyright            : (C) 2017 by Mathieu Pellerin
    Email                : nirvn dot asia 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 QGSLOCKBUTTON_H
#define QGSLOCKBUTTON_H

#include "qgsratiolockbutton.h"

#include <QToolButton>
#include "qgis_gui.h"
#include "qgis_sip.h"

#include <QPointer>
class QDoubleSpinBox;

class GUI_EXPORT QgsRatioLockButton : public QToolButton
{
    Q_OBJECT
    Q_PROPERTY( bool locked READ locked WRITE setLocked )

  public:

    QgsRatioLockButton( QWidget *parent SIP_TRANSFERTHIS = nullptr );

    void setLocked( bool locked );

    bool locked() const { return mLocked; }

    void setWidthSpinBox( QDoubleSpinBox *widget );

    void setHeightSpinBox( QDoubleSpinBox *widget );

    void resetRatio();

  signals:

    void lockChanged( bool locked );

  protected:

    void changeEvent( QEvent *e ) override;
    void showEvent( QShowEvent *e ) override;
    void resizeEvent( QResizeEvent *event ) override;

  private:

    void drawButton();

    bool mLocked = false;

    QPointer< QDoubleSpinBox > mWidthSpinBox;
    double mPrevWidth = 0;
    QPointer< QDoubleSpinBox > mHeightSpinBox;
    double mPrevHeight = 0;
    bool mUpdatingRatio = false;

  private slots:

    void buttonClicked();

    void widthSpinBoxChanged( double value );
    void heightSpinBoxChanged( double value );

};

#endif