Window::set_scale_factor()

[npwoods]

Many applications have a technique for changing the scale (e.g. CTRL with the mouse wheel in Google Chrome). It would be very easy to implement similar features in Slint if we had Window::set_scale_factor() or the equivalent

[ogoffart]

What is your use case?
There is the SLINT_SCALE_FACTOR env variable that works with the winit backend at least.
For the MCU backend, there is a way to set the scale factor from slint-build crate config.
If you're writing your own platform, you can dispatch a window event to change the scale factor.

[npwoods]

I suppose my thinking is that I would like to implement a window level zoom/scale functionality similar to Google Chrome. Below is a screenshot of Chrome being scaled to 75%; imagine if I could invoke something along the lines of window.set_scale_factor(0.75); to do the same thing.

I realize that this is probably outside the scope of Slint's current notion of scale_factor, which is probably just to support displays with different DPIs. But I would argue that it should be possible to leverage this infrastructure to support this other use case.

[soulchainer]

@npwoods @ogoffart Could this be related to #9382, or is it something else?

[ogoffart]

That's mostly unrelated. Although maybe would fit the usecase if one scale the window.