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resizablescrollbar: refined timeline scrollbar resizing to be more accurate

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itsmattkc
2020-03-11 14:11:12 +11:00
parent 2d57f22f3a
commit c338e6d99d
3 changed files with 41 additions and 18 deletions
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app/widget/timebased/timebased.cpp
+17 -1
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@@ -81,7 +81,22 @@ void TimeBasedWidget::UpdateMaximumScroll()
void TimeBasedWidget::ScrollBarResized(const double &multiplier)
{
SetScale(GetScale() * multiplier);
QScrollBar* bar = static_cast<QScrollBar*>(sender());
int current_max = bar->maximum();
double proposed_max = static_cast<double>(current_max) * multiplier;
proposed_max = proposed_max - (bar->width() * 0.5 / multiplier) + (bar->width() * 0.5);
double corrected_scale;
if (current_max == 0) {
corrected_scale = multiplier;
} else {
corrected_scale = (proposed_max / static_cast<double>(current_max));
}
SetScale(GetScale() * corrected_scale);
}
TimeRuler *TimeBasedWidget::ruler() const
@@ -146,6 +161,7 @@ void TimeBasedWidget::SetTimebase(const rational &timebase)
void TimeBasedWidget::SetScale(const double &scale)
{
// Simple QObject slot wrapper around TimelineScaledObject::SetScale()
TimelineScaledObject::SetScale(scale);
}