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CommonStyle/QSlider: use drawLines() instead single drawLine() calls

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Optimize the painting of the tickmarks by collecting all lines to draw
in a vector and then passing all to the painter instead calling
drawLine() for every single tickmark.

Change-Id: Ic75e733a02fbf6143d21d4630f6a6d6de913f16c
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>
(cherry picked from commit 83ab7d21150115fbbe954af7d87f1597bf65d206)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
This commit is contained in:
Christian Ehrlicher 2023-12-29 15:27:46 +01:00 committed by Qt Cherry-pick Bot
parent 5278624b62
commit 656576d3b4
1 changed files with 10 additions and 8 deletions
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10
src/widgets/styles/qfusionstyle.cpp
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@ -2785,6 +2785,7 @@ void QFusionStyle::drawComplexControl(ComplexControl control, const QStyleOption
int v = slider->minimum;
int len = proxy()->pixelMetric(PM_SliderLength, slider, widget);
QVector<QLine> lines;
while (v <= slider->maximum + 1) {
if (v == slider->maximum + 1 && interval == 1)
break;
@ -2798,20 +2799,20 @@ void QFusionStyle::drawComplexControl(ComplexControl control, const QStyleOption
if (horizontal) {
if (ticksAbove) {
painter->drawLine(pos, slider->rect.top() + extra,
lines += QLine(pos, slider->rect.top() + extra,
pos, slider->rect.top() + tickSize);
}
if (ticksBelow) {
painter->drawLine(pos, slider->rect.bottom() - extra,
lines += QLine(pos, slider->rect.bottom() - extra,
pos, slider->rect.bottom() - tickSize);
}
} else {
if (ticksAbove) {
painter->drawLine(slider->rect.left() + extra, pos,
lines += QLine(slider->rect.left() + extra, pos,
slider->rect.left() + tickSize, pos);
}
if (ticksBelow) {
painter->drawLine(slider->rect.right() - extra, pos,
lines += QLine(slider->rect.right() - extra, pos,
slider->rect.right() - tickSize, pos);
}
}
@ -2821,6 +2822,7 @@ void QFusionStyle::drawComplexControl(ComplexControl control, const QStyleOption
break;
v = nextInterval;
}
painter->drawLines(lines);
}
// draw handle
if ((option->subControls & SC_SliderHandle) ) {