在Retina显示屏中带有QOpenGLWIdget的Qt MainWindow显示错误的大小 [英] Qt MainWindow with QOpenGLWIdget in Retina display displays wrong size

问题描述

我有一个MainWindow的Qt应用程序.

I have a Qt application with a MainWindow.

我在其中嵌入了QOpenGLWidget.一切正常，直到我开始使用Apple Retina显示器并以High DPI模式运行我的应用程序:我的QOpenGLWidget只是它原本应该具有的大小的1/4(即，它仅填充了屏幕的左下角部分)应该填充的区域).此小部件正在显示原始OpenGL数据(实际上是一个OpenSceneGraph上下文)

I embed a QOpenGLWidget in it. Everything works fine until I start using an Apple Retina Display and run my app in High DPI mode: my QOpenGLWidget is just 1/4 of the size it was supposed to have (i.e., it only fills the bottom-left part of the area it is supposed to fill). This widget is displaying raw OpenGL data (actually, an OpenSceneGraph context)

该怎么办?

推荐答案

发现，对于OpenGL相关的小部件和事件，目前最好的选择是使用QPaintDevice::devicePixelRatio()(

Found out that the best option for now, for OpenGL related widgets and events, is to use the QPaintDevice::devicePixelRatio() (http://doc.qt.io/qt-5/qpaintdevice.html#devicePixelRatio)

这意味着将所有使用像素坐标的内容相乘，即鼠标事件，调整大小事件等等.示例:

This implies multiplying everything that uses pixel coordinates, i.e., mouse events, resizing events, and so on. Example:

void MyGLWidget::resizeGL(int width, int height) {
  width *= Application::desktop()->devicePixelRatio(); 
  height *= Application::desktop()->devicePixelRatio(); 

  ...
  // Continue with previous code

}

在Retina/HighDPI显示器中以低分辨率模式运行时，或在常规显示器中运行时，该比例为1，因此对我来说似乎是可移植的.

When running in low resolution mode in a Retina/HighDPI display, or when running in a regular display, this ratio is 1, so this seems portable to me.

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