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Fix "scroll here" feature of scrollbar (#10311)
Prevent setRange() from causing a recursive call to scrollTo(). Reduces three calls of scrollTo() to one call for all scrolling functions of the scroll bar (e.g. clicking on the arrow, dragging, or clicking somewhere on the scrollbar).
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@ -564,6 +564,12 @@ void BufferView::updateScrollbar()
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d->scrollbarParameters_.max -= minVisiblePart();
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else
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d->scrollbarParameters_.max -= d->scrollbarParameters_.page_step;
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// 0 must be inside the range as it denotes the current position
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if (d->scrollbarParameters_.max < 0)
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d->scrollbarParameters_.max = 0;
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if (d->scrollbarParameters_.min > 0)
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d->scrollbarParameters_.min = 0;
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}
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@ -671,10 +671,9 @@ void GuiWorkArea::toggleCursor()
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void GuiWorkArea::Private::updateScrollbar()
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{
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ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
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// WARNING: don't touch at the scrollbar value like this:
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// verticalScrollBar()->setValue(scroll_.position);
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// because this would cause a recursive signal/slot calling with
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// GuiWorkArea::scrollTo
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// Block signals to prevent setRange() and setSliderPosition from causing
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// recursive calls via the signal valueChanged. (#10311)
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QSignalBlocker blocker(p->verticalScrollBar());
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p->verticalScrollBar()->setRange(scroll_.min, scroll_.max);
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p->verticalScrollBar()->setPageStep(scroll_.page_step);
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p->verticalScrollBar()->setSingleStep(scroll_.single_step);
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