概述

通过比例系数来实现高分屏适配，软件的每个UI组件尺寸都要乘以比例系数，以达到适配高分辨率的目的

实现

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win32:{
QT += winextras
}

#include <QApplication>
#ifdef Q_OS_WIN
#include "windows.h"
#endif

void getWindowScaleFactor()
{
    double scaleFactor = 1.0;
#ifdef Q_OS_WIN
    int nWidth = GetSystemMetrics(SM_CXSCREEN);
#else
    QRectF rect = QApplication::desktop()->screenGeometry();
    int nWidth = rect.width();
#endif

    if(nWidth >= 3840 )
    {
          scaleFactor = 2.0;
    }
    else if(nWidth < 3840 && nWidth > 1366 )
    {
          scaleFactor = 1.0;
    }
    else if(nWidth <= 1366  && nWidth > 800 )
    {
          scaleFactor = 0.8;
    }
    else if(nWidth <= 800)
    {
          scaleFactor = 0.5;
    }

    //各类靠property获取比例系数
    QApplication::instance()->setProperty("scalefactor", dScaleFactor); 
    return;
}