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Make really sure to wait for previews after zoom changes

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Relying on the fact that the timer is not active anymore does not
guarantee that the previews at the correct zoom are ready because
the regeneration process may take several seconds and during this
time the zoom factor may be changed again. So, we need an additional
guard for assuring that everything has settled down.
This commit is contained in:
Enrico Forestieri 2015-06-21 11:21:59 +02:00
parent dd09a5cabc
commit 2973108a62
1 changed files with 7 additions and 3 deletions
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10
src/graphics/PreviewLoader.cpp
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@ -254,6 +254,8 @@ private:
mutable int font_scaling_factor_;
///
QTimer * delay_refresh_;
///
bool finished_generating_;
/// We don't own this
static lyx::Converter const * pconverter_;
@ -402,7 +404,7 @@ namespace lyx {
namespace graphics {
PreviewLoader::Impl::Impl(PreviewLoader & p, Buffer const & b)
: parent_(p), buffer_(b)
: parent_(p), buffer_(b), finished_generating_(true)
{
font_scaling_factor_ = int(buffer_.fontScalingFactor());
if (!pconverter_)
@ -437,8 +439,8 @@ PreviewLoader::Impl::preview(string const & latex_snippet) const
// has not been changed for about 1 second.
delay_refresh_->start(1000);
}
// Don't try to access the cache until we are finished.
if (delay_refresh_->isActive())
// Don't try to access the cache until we are done.
if (delay_refresh_->isActive() || !finished_generating_)
return 0;
Cache::const_iterator it = cache_.find(latex_snippet);
return (it == cache_.end()) ? 0 : it->second.get();
@ -452,6 +454,7 @@ void PreviewLoader::Impl::refreshPreviews()
Cache::const_iterator cend = cache_.end();
while (cit != cend)
parent_.remove((cit++)->first);
finished_generating_ = false;
buffer_.updatePreviews();
}
@ -788,6 +791,7 @@ void PreviewLoader::Impl::finishedGenerating(pid_t pid, int retval)
for (; nit != nend; ++nit) {
imageReady(*nit->get());
}
finished_generating_ = true;
}