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Fix scrollbar not appearing in new documents unless reloaded (#10729)

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QSignalBlocker in updateScrollbar is too strong and prevents the scroll bar from
communicating with its scroll area. The only solution to block signals between
specifically between two objects is to disconnect. This makes sense in this
case, by making updateScrollbar responsible for managing the connection in the
first place.
This commit is contained in:
Guillaume MM 2017-07-25 00:15:20 +02:00
parent 52025d5c9b
commit 764c61a08f
2 changed files with 9 additions and 8 deletions
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14
src/frontends/qt4/GuiWorkArea.cpp
View File

@ -325,10 +325,6 @@ void GuiWorkArea::init()
generateSyntheticMouseEvent();
});
// Initialize the vertical Scroll Bar
QObject::connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
this, SLOT(scrollTo(int)));
LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
<< " viewport height: " << viewport()->height());
@ -675,14 +671,18 @@ void GuiWorkArea::toggleCursor()
void GuiWorkArea::Private::updateScrollbar()
{
// Prevent setRange() and setSliderPosition from causing recursive calls via
// the signal valueChanged. (#10311)
QObject::disconnect(p->verticalScrollBar(), SIGNAL(valueChanged(int)),
p, SLOT(scrollTo(int)));
ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
// 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);
p->verticalScrollBar()->setSliderPosition(0);
// Connect to the vertical scroll bar
QObject::connect(p->verticalScrollBar(), SIGNAL(valueChanged(int)),
p, SLOT(scrollTo(int)));
}

3
src/frontends/qt4/GuiWorkArea_Private.h
View File

@ -111,7 +111,8 @@ struct GuiWorkArea::Private
void hideCursor();
/// show the cursor if it is not visible
void showCursor();
///
/// Set the range and value of the scrollbar and connect to its valueChanged
/// signal.
void updateScrollbar();
/// Change the cursor when the mouse hovers over a clickable inset
void updateCursorShape();