Windows 10中Qt Desktop应用程序的缩放比例不正确 [英] improper scaling of Qt Desktop application in windows 10

问题描述

我正在为Windows 10编写一个简单的Qt(窗口小部件)Gui应用程序.我正在使用Qt的5.6.0 beta版.

I'm writing a simple Qt (Widgets) Gui application for windows 10. I'm using the 5.6.0 beta version of Qt.

我遇到的问题是它根本无法缩放到我的Surfacebook的屏幕上:

The problem I'm having is that it isn't scaling right to the screen of my surfacebook at all:

很难说出来，因为SO会缩放图像，但是请注意，停靠窗口小部件标题栏控件相对于窗口标题栏控件的大小.

It's a bit hard to tell because SO scales the image, but notice how small the dock widget title bar controls are relative to the window title bar controls.

此链接讨论了缩放，但主要集中在qml/qtQuick和移动应用程序，通常还暗示，在台式机QtWidgets应用程序中，QPainter将自动确定适当的缩放比例，而显然不是.

This link from Qt talks about scaling, but it's mostly focuses on qml/qtQuick and mobile applications in general, and additionally seems to imply that in a desktop QtWidgets application, QPainter will automatically determine the proper scaling, which it clearly is not.

确保台式机，非qml Qt应用程序在高DPI显示器(尤其是Windows 10)上正确缩放的最佳方法是什么?

What's the best way to ensure that desktop, non-qml Qt applications scale properly on high-DPI monitors, specifically with windows 10?

推荐答案

Qt最近发布了有关此问题的博客文章

Qt has recently released a blog post about this issue here.

从Qt 5.6起启用了高DPI支持.在OS X平台上，本机支持High-DPI.在X11/Windows/Android上，有两种方法可以根据博客文章启用高DPI检测:

High DPI support is enabled from Qt 5.6 onward. On OS X platforms, there is native support for High-DPI. On X11/Windows/Android, there are two methods to enable high-DPI detection per the blog post:

1. 设置环境变量
2. 在程序源代码中设置属性

在系统环境变量中设置QT_AUTO_SCREEN_SCALE_FACTOR=1将解决扩展问题.

Setting QT_AUTO_SCREEN_SCALE_FACTOR=1 in your system environment variables will fix the scaling issue.

此外，在应用程序源代码中设置QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling);还应该允许自动进行高DPI缩放.

Additionally, setting QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling); in your application source code should also allow automatic high-DPI scaling.

注意:要使用属性方法，必须 在创建QApplication对象之前先设置属性 ，也就是说:

NOTICE: To use the attribute method, you must set the attribute before you create your QApplication object, that is to say:

#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication::setAttribute(Qt::AA_EnableHighDpiScaling);

    QApplication app(argc, argv);   
    return app.exec();
}

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