eez-open
[LVGL] Background color does not work for most components
Describe the bug For some components (I can confirm label, image and container) the background color does not appear.
To Reproduce Steps to reproduce the behavior:
- create a LVGL project (8.x)
- add a label to the screen
- change background color
- nothing happens, neither in the preview, nor when you click run, nor when I upload it to my device/screen
Expected behavior For the background color to change.
Screenshots
Desktop (please complete the following information):
- OS: [macOS]
- Version [15.1.1]
- Apple M2
** LVGL version (if used)**
- 8.x
Additional context It will change the code of screens.c, button works without problems and the code looks basically identical. Potentially related issue: #644
Oh, that is an embarrassing oversight on my side, thanks for the fast response.
I would suggest setting that to 255 on default (when color is set).
So for anybody finding this with similar problems: First check the opacity, some components have it set to 255 as the default value, some don't. You can set a new style, change it to the default value you want and than use that as the new default for the component.
The issue I had and why I opened this issue: If you have a smaller screen make sure you can actually see all the UI elements. There is a button at the top right (within every sub-window) to enlarge it. I thought I was going insane, sometimes things would work sometimes not, turns out I couldn't see all the settings and I was changing things in 'selected part'/'Ticks part' etc. and was wondering why none of the changes would do anything to the default behavior.
We are using LVGL default values for the opacity. For example, Button widget has 255 opacity by default and Label widget has 0.
I would suggest setting that to 255 on default (when color is set).
This makes sense. We can change opacity to 255 if it was 0 when color is changed.