On Fri, Sep 18, 2015 at 1:38 AM, Pavlo Dyachenko <upa...@gmail.com> wrote:
> Hi QT team, I posted a question on the forum about high DPI support but > then was recommended this mailing list instead: > According to documentation here http://doc.qt.io/qt-5/highdpi.html QT > 5.4+ introduces high DPI support. However, either I’m missing something > fundamental or the current support is still in very early stages. I’m > writing a brand new application so I have a chance to do it right from the > ground up. I understand that I would have to use layouts instead of fixed > positioning etc, but there always going to be cases in which I would have > to specify, for example a minimum/maximum size of a control. I can specify > them in the editor, but these are device pixels. So if I change my Windows > settings to use 150% DPI then min/max values in the editor would be too > small. Of course I can obtain that ratio and adjust all the required values > in code, but then what kind of high DPI support does QT give for me if I > have to do everything by hand? I mean how is it different to pre QT 5.4? > > Then an interesting one is QT_DEVICE_PIXEL_RATIO environment variable. It > does exactly what I need, it multiplies all pixels set in editor by a > factor. But why is it an environment variable and not a per application > setting? Why does it only support integer values of 2, 3 etc, since we know > that Windows has settings like 125, 150% etc. and why couldn’t it > automatically read the Windows setting and set itself to that value? > > Though I have not yet tried it, my understanding is that in Qt 5.6, the support for HiDPI has been improved. See https://doc-snapshots.qt.io/qt5-5.6/highdpi.html for the most recent documentation. Adam
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