QIcon from theme feature

[Alexey Serebryakov]

I've try to use icon from theme, like this

QIcon icon = QIcon::fromTheme(QStringLiteral("view-refresh"));

On Linux is okay but on Windows is nothing. Why?

Ok, what the strange myth of string "view-refresh"? Looking at https://specifications.freedesktop.org/icon-naming-spec/icon-naming-spec-latest.html I found the hard coded theme names for free desktop.

Is it OS specific? Or OS desktop manager specific? How can I fix it qiuckly particular on Windows? :-)

Thanks a lot guys, that forum is very useful for beginers and expirienced user of Qt exactly!

[VRonin]

What version of Qt are you using?

[Alexey Serebryakov]

@VRonin 5.12.9

[VRonin]

Windows does not have a platform theme, you can create a custom one based on something like this example.
You can take Icons from KDE's Breeze or Oxygen, they use LGPL 3 as license

[Alexey Serebryakov]

@VRonin Oh thank you. But how it works? I need create theme and include it in my project and distribute package?

[VRonin]

@Alexey-Serebryakov said in QIcon from theme feature:

I need create theme and include it in my project and distribute package?

Yes, for example, for breeze icons using MinGW, clone the repository (git clone https://invent.kde.org/frameworks/breeze-icons.git) then run

mkdir build && cd build
cmake -G"MinGW Makefiles" -DCMAKE_BUILD_TYPE=RELEASE ../
cmake --build .

(for MSVC replace MinGW Makefiles with NMake Makefiles)

Now in build\icons\res edit with notepad breeze-icons.qrc and change the second line from <qresource> to <qresource prefix="icons/Breeze">
Finally move all the contents of this folder into your project and add breeze-icons.qrc as a resource to it.
Make sure you also distribute the license file with your app to comply with LGPL 3.
To use it when the platform theme is not available, in your main() add:

if (QIcon::themeName().isEmpty())
    QIcon::setThemeName("Breeze");