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* save one redraw on each change of the scrollbar.

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git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@27471 a592a061-630c-0410-9148-cb99ea01b6c8
This commit is contained in:
Stefan Schimanski 2008-11-15 18:17:20 +00:00
parent 366a2e5d2e
commit e2f312f8f0
1 changed files with 7 additions and 1 deletions
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8
src/BufferView.cpp
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@ -549,9 +549,14 @@ docstring BufferView::contextMenu(int x, int y) const
void BufferView::scrollDocView(int value) void BufferView::scrollDocView(int value)
{ {
int const offset = value - d->scrollbarParameters_.position; int const offset = value - d->scrollbarParameters_.position;
// No scrolling at all? No need to redraw anything
if (offset == 0)
return;
// If the offset is less than 2 screen height, prefer to scroll instead. // If the offset is less than 2 screen height, prefer to scroll instead.
if (abs(offset) <= 2 * height_) { if (abs(offset) <= 2 * height_) {
scroll(offset); d->anchor_ypos_ -= offset;
updateMetrics(); updateMetrics();
buffer_.changed(); buffer_.changed();
return; return;
@ -2192,6 +2197,7 @@ void BufferView::draw(frontend::Painter & pain)
if (height_ == 0 || width_ == 0) if (height_ == 0 || width_ == 0)
return; return;
LYXERR(Debug::PAINTING, "\t\t*** START DRAWING ***"); LYXERR(Debug::PAINTING, "\t\t*** START DRAWING ***");
Text & text = buffer_.text(); Text & text = buffer_.text();
TextMetrics const & tm = d->text_metrics_[&text]; TextMetrics const & tm = d->text_metrics_[&text];
int const y = tm.first().second->position(); int const y = tm.first().second->position();