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Scaling issues with PyQt5 when using mixed resolution displays #8061
Description
Activity
Does Qt provide a signal we can hook into when the window changes screens (and hence the dpi scaling)?
- added this to the milestone on Feb 10, 2017
Looks like the easiest way is to look for screenChanged then in there check if devicePixelRatio changes:
https://forum.qt.io/topic/52296/detect-changing-devicepixelratio/4
Note that this also causes issues when just showing a plot on the lower-res screen that is attached to a retina screen laptop (the fonts are two times too large and lines two times too thick) - that is, without even changing screen. I think this is something to do with the fact that the DPI device ratio is declared to be 1 for the low-res screen. If I force _dpi_ratio to return 2 then the scaling looks correct on the low-res screen (but the mouse events are then wrong...). Can people test what the behavior is like on other OSes with mixed-resolution screens?
@astrofrog can you check with v2.0.1?
- modified the milestones: , on May 7, 2017
@tacaswell - this is still an issue with 2.0.1 unfortunately
It looks like you identified at least part of the machinery we need to add (screenChanged, etc.); any chance you can have a go at implementing it?
- modified the milestones: , on May 12, 2017
All right, I'm going to take a look at this today. This has been bugging me for a while. Wish me luck.
This bug report here describes two problems:
- The figure did not properly get notified on a DPI change
- The figure is rendered with incorrect DPI settings on the low-DPI monitor if a hi-DPI monitor is available on the system as-well.
#8931 only fixes the first of the two issues. Should this bug report be reopened or a separate one be created?
@burnpanck Can you make a new issue for the second?
I have a set-up where I have a retina MBP (bottom) plugged in to a non-retina display (top).
Normally Matplotlib looks fine on retina or non-retina displays when used separately, but in the case of mixed resolutions, the fonts and the elements of the figure appear too large on the non-retina display. The following image sequence shows a matplotlib window that was created on the retina display and is then moved to the non-retina display. The same issue happens if I create the figure in the non-retina display to start with, so this is not about moving from one to the other.
I then click in the bottom right to resize the window: