[Interest] Qt-12 with Dark Theme on MacOS Mojave

[Till Oliver Knoll]

> Am 21.12.2018 um 08:26 schrieb coroberti . <coroberti at gmail.com>:
> 
>> On Thu, Dec 20, 2018 at 9:33 PM Mike Krus <mike.krus at kdab.com> wrote:
> 
>> Hi
>> 
>> I’ve been tracking QEvent::PaletteChange events, like this:
>> 
>> bool MainWindow::event(QEvent *event)
>> {
>>     if (event->type() == QEvent::PaletteChange) {
>>         QPalette p = palette();
>>         m_clearColor = p.color(QPalette::Base);
>>         emit clearColorChanged(m_clearColor);
>>     }
>> 
>>     return QMainWindow::event(event);
>> }
>> 
>> Event gets sent when switching between themes…
>> 
>> Of course, I’m just using the base colour as is, not trying to figure out if it’s light or dark…
>> 
>> Hope this helps,
>> 
>> Mike
>> 
>> > On 20 Dec 2018, at 18:48, coroberti . <coroberti at gmail.com> wrote:
>> > 
>> > Hi,
>> > Qt-12 well manages the colors of QWidgets - great job of Qt-developers. Thank you!
>> > 
>> > When some background colors are managed by the application,
>> > how to figure out whether it's Light or Dark theme currently in use?
>> > 
>> > Another question is how to get notification about the switch between the themes?
>> 
> 
> Hi Mike,
> Thank you for your reply and the proposed direction.
> 
> It looks like what's left for me is to explore how to figure out from 
> QPalette mapping to the standard themes.

A practical approach could be:

* If the background colour („background role“) is „darker than some threshold (brightness)“, then the user selected dark mode
* Otherwise light mode

:)

Cheers, Oliver
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