Fusion: better support dark themes in the dial

A UI in dark mode will have a dark background. Pick a light color to
draw the notches. Since in the mac style, the dark mode's 'dark' color
is lighter than the 'light' color, pick whichever is lighter.

Change-Id: I333ea95b80d7a19504000877337b28839b4a8b9f
Reviewed-by: Doris Verria <doris.verria@qt.io>
(cherry picked from commit 38114b83250cc9b14069d41935fb8822475de45a)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
This commit is contained in:
Volker Hilsheimer 2022-07-15 08:52:43 +02:00 committed by Qt Cherry-pick Bot
parent 68ebfc4c2f
commit 85077365c0

View File

@ -226,7 +226,7 @@ QPolygonF calcLines(const QStyleOptionSlider *dial)
void drawDial(const QStyleOptionSlider *option, QPainter *painter)
{
QPalette pal = option->palette;
const QPalette pal = option->palette;
QColor buttonColor = pal.button().color();
const int width = option->rect.width();
const int height = option->rect.height();
@ -240,7 +240,11 @@ void drawDial(const QStyleOptionSlider *option, QPainter *painter)
// Draw notches
if (option->subControls & QStyle::SC_DialTickmarks) {
painter->setPen(option->palette.dark().color().darker(120));
const bool inverted = pal.window().color().lightness() < pal.text().color().lightness()
&& pal.light().color().lightness() > pal.dark().color().lightness();
const QColor notchColor = inverted ? pal.light().color().lighter(120)
: pal.dark().color().darker(120);
painter->setPen(notchColor);
painter->drawLines(QStyleHelper::calcLines(option));
}