Signal/Slots doesn't work with QSlider and QDoubleSpinBox

jsulm

I did not test this code:

void MyClass::sliderHeightChanged(int value)
{
    double diff = m_heightSpinBox->value - value;
    m_heightSpinBox->setValue(value);
    m_widthSpinBox->setValue(m_widthSpinBox->value + diff);
}

void MyClass::sliderWidthChanged(int value)
{

    double diff = m_widthSpinBox->value - value;
    m_widthSpinBox->setValue(value);
    m_HeightSpinBox->setValue(m_heightSpinBox->value + diff);
}

if (m_keepRatioCheckBox->isChecked())
{
    connect(sliderHeight, &QSlider::valueChanged, this, &MyClass::sliderHeightChanged);
    connect(sliderWidth, &QSlider::valueChanged, this, &MyClass::sliderWidthChanged);
}

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@jsulm
I have written all the Code for the Dialog in a Header file..

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@jsulm
Where can i insert your Code?

class ResizeImageDialog : public QDialog
{
Q_OBJECT

double         m_ratio;

QLabel         *m_widthLabel;
QLabel         *m_hightLabel;
QDoubleSpinBox *m_widthSpinBox;
QDoubleSpinBox *m_hightSpinBox;
QRadioButton   *m_keepRatioCheckBox;
QPushButton    *m_okButton;
QPushButton    *m_cancelButton;
QSlider        *sliderWidth;
QSlider        *sliderHeight;
QHBoxLayout    *m_widthLayout;
QHBoxLayout    *m_hightLayout;
QHBoxLayout    *m_buttonLayout;
QVBoxLayout    *m_generalLayout;


public:
ResizeImageDialog(QWidget * parent = 0, double imageWidth = 100.0, double imageHight = 100.0) : QDialog(parent)
{
   m_widthLabel = new QLabel("Breite");
   m_hightLabel = new QLabel("Höhe");

   m_widthSpinBox = new QDoubleSpinBox;
   m_widthSpinBox->setMaximum(1500);
   m_widthSpinBox->setValue(imageWidth);


   sliderHeight = new QSlider(Qt::Horizontal);
   sliderHeight->setMaximum(1500);
   sliderHeight->setMinimum(0);




   sliderWidth = new QSlider(Qt::Horizontal);
   sliderWidth->setMaximum(1500);
   sliderWidth->setMinimum(0);


   m_hightSpinBox = new QDoubleSpinBox;
   m_hightSpinBox->setMaximum(1500);
   m_hightSpinBox->setValue(imageHight);

   connect(sliderHeight, &QSlider::valueChanged, m_hightSpinBox, &QDoubleSpinBox::setValue);
   connect(sliderWidth, &QSlider::valueChanged, m_widthSpinBox, &QDoubleSpinBox::setValue);

   m_ratio = imageWidth / imageHight;

   m_keepRatioCheckBox = new QRadioButton("Keep ratio", this);
   m_keepRatioCheckBox->setChecked(false);


   if (m_keepRatioCheckBox->isChecked())
   {
      connect(sliderHeight, &QSlider::valueChanged, m_hightSpinBox, &QDoubleSpinBox::setValue);
      connect(sliderHeight, &QSlider::valueChanged, m_widthSpinBox, &QDoubleSpinBox::setValue);
      connect(sliderWidth, &QSlider::valueChanged, m_hightSpinBox, &QDoubleSpinBox::setValue);
      connect(sliderWidth, &QSlider::valueChanged, m_widthSpinBox, &QDoubleSpinBox::setValue);
      m_hightSpinBox->setValue(25.8);
   }

   
   
   
   

   m_widthLayout = new QHBoxLayout;
   m_widthLayout->addWidget(m_widthLabel);
   m_widthLayout->addWidget(m_widthSpinBox);
   m_widthLayout->addWidget(sliderWidth);

   m_hightLayout = new QHBoxLayout;
   m_hightLayout->addWidget(m_hightLabel);
   m_hightLayout->addWidget(m_hightSpinBox);
   m_hightLayout->addWidget(sliderHeight);

   m_okButton = new QPushButton("Ok");
   connect(m_okButton, SIGNAL(clicked()), this, SLOT(accept()));

   m_cancelButton = new QPushButton("Abbrechen");
   connect(m_cancelButton, SIGNAL(clicked()), this, SLOT(reject()));

   m_buttonLayout = new QHBoxLayout;
   m_buttonLayout->addStretch();
   m_buttonLayout->addWidget(m_okButton);
   m_buttonLayout->addWidget(m_cancelButton);

   m_generalLayout = new QVBoxLayout;
   m_generalLayout->addLayout(m_widthLayout);
   m_generalLayout->addLayout(m_hightLayout);
   m_generalLayout->addWidget(m_keepRatioCheckBox);
   m_generalLayout->addLayout(m_buttonLayout);
   setLayout(m_generalLayout);

   setMaximumSize(500, 300);
   resize(350, 100);
   setModal(true);
   //resize(670,630);
   setWindowTitle(tr("Bildgröße ändern"));
   setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
}

static QPair<double, double> getNewSize(QWidget * parent = 0, double imageWidth = 100.0, double imageHight = 100.0)
{
   ResizeImageDialog dlg(parent, imageWidth, imageHight);

   dlg.exec();



   QPair<double, double> size;
   size.first  = dlg.m_widthSpinBox->value();
   size.second = dlg.m_hightSpinBox->value();
   return size;
}
};


#endif // PAGESTEXTEDIT_H

A .cpp file is not there for the dialog

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@jsulm
Are there other methods for resizing an Image?

Maybe drag the Image in the Corners for resizing?