I'm confused about the Window size Parameter... I want to open my Windows in Full HD, but the Window...

# compose-desktop

[Stefan Oltmann]

I'm confused about the Window size Parameter... I want to open my Windows in Full HD, but the Window has a completely different size... ?

[Igor Demin]

Window size uses density-independent pixels.

It means width=800 means 1600 pixels with DPI=2.0 (on high-retina displays on macOs).

It is more explicit in the new window API, as there we specify 800.dp, not just 800

[Stefan Oltmann]

I thought so, but if I define a width of 1280 and screenshot the resulting window it's 1664 pixels. My scale is 2.0 regarding to LocalDensity.currrent

[Stefan Oltmann]

How can I specify that in dp using the new API? I don't see that in the tutorial.

[Igor Demin]

See this

You need to pass size argument:

val state = rememberWindowState(size = WindowSize(800.dp, 600.dp))

Probably we need to add this information to the tutorial 🤔

[Stefan Oltmann]

Ok, thank you 🙂

[Stefan Oltmann]

Maybe that's a bug because using the new API results in the same display resolutions on macOS.

I defined 1920/2 als my wished Window size and the resulting size is 2144

[Igor Demin]

But it the same as in the old API

So, if you have 1664 pixels window on screenshot with width=1280 and LocalDensity.current=2.0, probably something somewhere doesn't work as expected.

Either in Compose, or in the screenshot tool.

This width is measured on a screenshot of the entire screen, or on a screenshot of just single window?

[Stefan Oltmann]

single window screenshot

[Stefan Oltmann]

Using macOS Screenshot tool

[Igor Demin]

Try to make a screenshot of the entire screen and calculate size manually - relative to the width of the screenshot

[Igor Demin]

I defined 1920/2 als my wished Window size and the resulting size is 2144

Note that, window has horizontal insets (border and shadow). The size of the window includes them

[Igor Demin]

To know what insets are, you can use Swing interop:
window.insets
(they are in density-independent pixels too)

[Stefan Oltmann]

Ok, thank you. That helped me a lot.

And yes, you are right. I have some tooling problem. I wasn't aware that the Screenshots made with macOS build-in app have a lot of padding for the shadows.

[Stefan Oltmann]

Didn't expect that. So everything is fine and I switched to the new API. Thank you again