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