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Fix "scroll here" feature of scrollbar (#10311)

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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).

(cherry picked from commit 4d7b912ca1)
This commit is contained in:
Guillaume Munch 2016-07-29 21:27:13 +01:00
parent 8acc5b85c4
commit 49ce94f636
2 changed files with 9 additions and 4 deletions
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6
src/BufferView.cpp
View File

@ -565,6 +565,12 @@ void BufferView::updateScrollbar()
d->scrollbarParameters_.max -= minVisiblePart();
else
d->scrollbarParameters_.max -= d->scrollbarParameters_.page_step;
// 0 must be inside the range as it denotes the current position
if (d->scrollbarParameters_.max < 0)
d->scrollbarParameters_.max = 0;
if (d->scrollbarParameters_.min > 0)
d->scrollbarParameters_.min = 0;
}

7
src/frontends/qt4/GuiWorkArea.cpp
View File

@ -675,10 +675,9 @@ void GuiWorkArea::toggleCursor()
void GuiWorkArea::Private::updateScrollbar()
{
ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
// WARNING: don't touch at the scrollbar value like this:
// verticalScrollBar()->setValue(scroll_.position);
// because this would cause a recursive signal/slot calling with
// GuiWorkArea::scrollTo
// Block signals to prevent setRange() and setSliderPosition from causing
// recursive calls via the signal valueChanged. (#10311)
QSignalBlocker blocker(p->verticalScrollBar());
p->verticalScrollBar()->setRange(scroll_.min, scroll_.max);
p->verticalScrollBar()->setPageStep(scroll_.page_step);
p->verticalScrollBar()->setSingleStep(scroll_.single_step);