Custom style : QWindowsStyle « Qt « C++

1. C++
2. Qt
3. QWindowsStyle

Custom style

  
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#ifndef CUSTOMSTYLE_H
#define CUSTOMSTYLE_H

#include <QWindowsStyle>

class CustomStyle : public QWindowsStyle
{
    Q_OBJECT

public:
    CustomStyle()
    ~CustomStyle() {}

    void drawPrimitive(PrimitiveElement element, const QStyleOption *option,
                       QPainter *painter, const QWidget *widget) const;
};

#endif








#include <QtGui>

#include "customstyle.h"

CustomStyle::CustomStyle()
{
    QSpinBox *spinBox = qobject_cast<QSpinBox *>(widget);
    if (spinBox) {
    }
}

void CustomStyle::drawPrimitive(PrimitiveElement element, const QStyleOption *option,
                                QPainter *painter, const QWidget *widget) const
{
    if (element == PE_IndicatorSpinUp || element == PE_IndicatorSpinDown) {
  QPolygon points(3);
  int x = option->rect.x();
  int y = option->rect.y();
  int w = option->rect.width() / 2;
  int h = option->rect.height() / 2;
  x += (option->rect.width() - w) / 2;
  y += (option->rect.height() - h) / 2;

  if (element == PE_IndicatorSpinUp) {
      points[0] = QPoint(x, y + h);
      points[1] = QPoint(x + w, y + h);
      points[2] = QPoint(x + w / 2, y);
  } else { // PE_SpinBoxDown
      points[0] = QPoint(x, y);
      points[1] = QPoint(x + w, y);
      points[2] = QPoint(x + w / 2, y + h);
  }

  if (option->state & State_Enabled) {
      painter->setPen(option->palette.mid().color());
      painter->setBrush(option->palette.buttonText());
  } else {
      painter->setPen(option->palette.buttonText().color());
      painter->setBrush(option->palette.mid());
  }
  painter->drawPolygon(points);
    } else {
  QWindowsStyle::drawPrimitive(element, option, painter, widget);
    }
}





#include <QtGui>

#include "customstyle.h"

int main(int argc, char *argv[])
{
    QApplication::setStyle(new CustomStyle);
    QApplication app(argc, argv);
    QSpinBox spinBox;
    spinBox.show();
    return app.exec();
}

   
    
  

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