[EXTERNAL] Explanation of different scaling factors anywhere?

Tom Schindl tom.schindl at bestsolution.at
Tue Jan 28 11:09:04 UTC 2020

I think that can not work because layouts don't take the scale factor
into account nor does stuff like ScrollView but i could be wrong.


On 27.01.20 17:29, David Grieve wrote:
> Wouldn't this just be a scale transform? 
>> -----Original Message-----
>> From: openjfx-dev <openjfx-dev-bounces at openjdk.java.net> On Behalf Of
>> Mike Hearn
>> Sent: Monday, January 27, 2020 11:00 AM
>> To: openjfx-dev at openjdk.java.net
>> Subject: [EXTERNAL] Explanation of different scaling factors anywhere?
>> Hello,
>> A feature I often miss when using non-web GUIs is support for browser style
>> zooming. In JavaFX it is quite easy to specify all font sizes in terms of "ems",
>> relative sizes ("largest") or percentages and then adjust the base font size on a
>> root node inside key handlers. This works OK but doesn't do much for images
>> or other controls, and of course most JavaFX GUI code specifies sizes in terms
>> of pixels.
>> There are various scaling factors applied to pixel sizes. There is the per-node
>> scaling transform, but this doesn't affect layout so isn't comparable to what
>> browsers do. There's a per-screen DPI, there's a "platform scale", there's a
>> "render scale" and then there's a "ui scale".
>> These seem related to hidpi/retina support and are all internal (for the
>> purposes of this question I'm happy to modify JavaFX itself).
>> Render scale seems to affect resolution without affecting positions or layout,
>> so that's not quite what I want. UI scale sounds promising but isn't
>> documented and I couldn't quite figure it out by reading the code, though I
>> could just fiddle with it and see what happens.
>> It feels like someone probably explored this before now. Is there a way to
>> effectively expand the size of every node without altering the size of the
>> containing viewport, to get browser-style layout affecting  zoom?  If not, has
>> anyone explored the complexity of the modifications required?
>> thanks,
>> -mike

Tom Schindl, CTO
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