2016-07-19 15:58 GMT+03:00 Shawn Rutledge <shawn.rutle...@qt.io>: >> App should remember of couse this setting to restore it back at restart > > How should Qt encourage this? So far we have QSettings, but you need to > define your own setting. And we have not made it easy to scale all fonts > simultaneously, interactively. Bindings are too cumbersome and expensive to > be the universal solution. To avoid setting the font on every individual > Text item in a QtQuick app, for example, you can use > QGuiApplication::setFont(). But that’s just for the default. Maybe there > should be an event of some sort when you do that at runtime, which every Text > will react to, and which will then trigger the necessary layout changes. But > that would only take care of Text which uses the default font, so we need > that unit support in QML (which has been discussed for years but not done > yet) to be able to have a unit which represents the default font size, so > that larger text could have a size 1.2x as big as the default instead of an > actual point size. Or maybe the event should be sent when you do > QHighDpiScaling::setScreenFactor(), but that’s private API so far, and it’s > still not clear to me which of those Qt high dpi-things are intended to > affect only or mainly font sizes, and which of them demand everything to be > scaled even if it will cause crappy results (scaling up pixmaps or > pre-rendered widgets by non-integral ratios). The prototype zoom-slider is > in qtbase/tests/manual/highdpi, but you can see what goes wrong with that. > We need a similar test for QtQuick to see what goes wrong with dynamic > scaling there.
In Material Design guidelines [1] all font sizes are in scaleable pixels (sp). So this size could be multiplied by some factor and all fonts should scale equally. I think, it's worth to add the support of the font scale factor to the Qt (enabled by something like Qt::AA_EnableFontScaling). And platform plugin could try to get font scale factor from the OS settings and use it by default. [1] https://material.google.com/layout/units-measurements.html#units-measurements-scaleable-pixels-sp- _______________________________________________ Development mailing list Development@qt-project.org http://lists.qt-project.org/mailman/listinfo/development
