[Interest] DPI

igor.mironchik at gmail.com igor.mironchik at gmail.com
Sun Feb 23 17:17:59 CET 2014

You are right.

QScreen is more reliable than QDesktopWidget.

At least QScreen makes calculations, handles system's calls, etc...

-----Original Message----- 
From: Allan Sandfeld Jensen
Sent: Sunday, February 23, 2014 4:54 PM
To: igor.mironchik at gmail.com
Cc: interest at qt-project.org ; Andre Somers
Subject: Re: [Interest] DPI

On Sunday 23 February 2014, igor.mironchik at gmail.com wrote:
> QScreen::physicalDotsPerInch returns the same value as
> QDesktopWidget::physicalDpi.
> But why do you think that QScreen::physicalDotsPerInch more reliable?
> P.S. I did not look at the Qt code yet, but I guess that I have to do 
> it...
QScreen is a more direct source, and it has more raw data. A QWidget can 
been moved from one screen to another, or overlap multiple screens, all 
its screen specific information less direct and more error-prone.

Too bad QScreen didn't have the information you needed though.


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