QtQuick wrong Device Pixel Ratio (DPR) when using multiple screens with different DPR

bdg85

Hi,

I have a retina mac book pro connected with a bigger screen:
Screen1: LCD (retina, devicePixelRatio=2) 1280x800 (in device points)
Screen2: LED Cinema Display (non retina, devicePixelRatio=1) 1920x1200

The problem is this:
If my QtQuick main window starts in Screen2, it detects the wrong screen (Screen1). Therefore, if I drag the window to Screen1, no signal is raised that the monitor is changed. This prevents me to update my OpenGL renderer with the new devicePixelRatio.

I have written a simple test application in QML to show this:

import QtQuick 2.4
import QtQuick.Controls 1.3
import QtQuick.Window 2.2

ApplicationWindow {
    id: appWin
    title: qsTr("Hello World")
    width: 440
    height: 320
    visible: true

    Screen.onDevicePixelRatioChanged: {
        console.log("dpr changed");
        dprSignalId.text = "dpr changed at seconds: " + new Date().getSeconds();
    }

    Column{
       Text{
           id: screenTextId
           text: Screen.name + " " + Screen.devicePixelRatio + " " + Screen.width + "x" + Screen.height
       }
       Text{
           id: dprSignalId
       }
    }
}

bdg85

Anyone?

Just ask if the question was unclear: I may add further details.

mrjj

@bdg85

Your question is very clear. ( and i dont even know quick)

Im just wondering if you would have better luck in the QT Quick group
as what I have seen here is mostly c++

bdg85

Thank you for the advice!
I'll post there straight away.

Feel free to remove this one for cross-posting issues.

mrjj

@bdg85
Well unlike other forums
cross-posting is not really frown upon here :)

Good luck

SGaist

@mrjj well… It depends ;) Asking to move the post to a better suited sub-forum is the usual thing to do

@bdg85 Did you check the bug report system ? IIRC, there was something about that (but I can't be 100% positive)

mrjj

@SGaist Oh - my bad- ok, And my move, you mean delete and post again. I assume.

SGaist

No no, you can ask an moderator or admin to do that

mrjj

@SGaist Aha, and you are a moderator or how would i spot one?

SGaist

I looks like currently there's no easy way like a badge for that, would be nice though. Yes I am

mrjj

@SGaist
Oh ok, so the flag icon is not for that. ? So say i had a post that needed moving. Would I then message you or post a "please move" or how would one go about it ? Maybe this not the right place to ask. just wondering.

SGaist

The flag is to tell moderator that there might be something fishy with a post/thread like content unrelated to Qt, spam etc. and they should look at it.

To move a thread, you would start a chat with a moderator to ask to move your thread when you see it's not in the right section.

mrjj

Is there any way to see from profile if they are a mod/admin ?
thank you for the clarification.

SGaist

Currently it doesn't seem so

You're welcome