In Pyside6 (Or C Qt), how do I set a custom QML style at runtime?-CodePudding

I want to use a custom style for my QML application. I have followed these instructions: https://doc.qt.io/qt-6/qtquickcontrols2-customize.html#creating-a-custom-style

I have a directory structure like this

MyApp/
├─ main.py
├─ QML/
│  ├─ Main.qml
├─ MyStyle/
│  ├─ qmldir
│  ├─ ToolTip.qml

I have created a style by creating a module (using a qmldir, and putting QML files inside it)

My qmldir contains

module MyStyle
ToolTip 3.0 ToolTip.qml

And ToolTip.qml contains

import QtQuick.Templates 2.0 as T
import QtQuick
import QtQuick.Controls

T.ToolTip {
    id: control
    text: qsTr("A descriptive tool tip of what the button does")

    contentItem: Text {
        text: control.text
        font: control.font
        color: "red"
    }

    background: Rectangle {
        border.color: "grey"
    }
}

I then tried to apply this in main.py (The API is very similar to the C one)

app = QApplication(sys.argv)
engine = QQmlApplicationEngine()
QQuickStyle.setStyle("MyStyle")
engine.load(QUrl.fromLocalFile(f"{os.path.dirname(__file__)}/QML/Main.qml"))
app.exec()

But during engine.load I get the error:

file:///D:/MyApp/QML/Main.qml: module "MyStyle" is not installed `QQuickStyle.setStyle`

It is interesting that the error only happens once engine.load is reached. QQuickStyle.setStyle does not give an error (however, it also does not error even if nonsense is given).

I have tried adding:

engine.registerModule("MyStyle", os.path.dirname(__file__)   "/MyStyle")

And:

engine.setImportPathList([os.path.dirname(__file__)   "/MyStyle"])

But these also does not work.

How do I install my custom style so I can use it, just like I would use:

QQuickStyle.setStyle("Material")

Thanks

edit

If I add:

engine.addPluginPath(f"{os.path.dirname(__file__)}/MyStyle")
qmlRegisterModule("MyStyle", 1, 0)

Then I do not get the error, but my ToolTip style is still not applied.

CodePudding user response：

Your directory is called Style could you test if it works when you rename it to match your style name MyStyle.

From the documentation you've shared:

The style name must match the casing of the style directory; passing mystyle or MYSTYLE is not supported.

CodePudding user response：

After lots of trial and error, I have found the answer:

app = QApplication(sys.argv)
engine = QQmlApplicationEngine()
#THIS NEEDS TO BE THE PATH WITH THE MODULE DIR, NOT THE MODULE DIR ITSELF
engine.addImportPath(f"{os.path.dirname(__file__)}")    
#NOW YOU CAN ADD IT AS A STYLE
QQuickStyle.setStyle("MyStyle")
QQuickStyle.setFallbackStyle("Material")
url = QUrl.fromLocalFile(args.qml)
engine.load(url)
ret = app.exec()