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LibGUI: Fix GDirectoryModel lifetime bug.

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Thumbnail generation callbacks were getting called after the class was already being destroyed causing a crash to occur.
This commit is contained in:
Brandon Scott 2019-10-01 20:49:10 -05:00 • committed by Andreas Kling
parent 9da121f837
commit 17597f4681
2 changed files with 9 additions and 2 deletions
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8
Libraries/LibGUI/GDirectoryModel.cpp
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@ -126,14 +126,20 @@ bool GDirectoryModel::fetch_thumbnail_for(const Entry& entry)
s_thumbnail_cache.set(path, nullptr); s_thumbnail_cache.set(path, nullptr);
m_thumbnail_progress_total++; m_thumbnail_progress_total++;
auto directory_model = make_weak_ptr();
LibThread::BackgroundAction<RefPtr<GraphicsBitmap>>::create( LibThread::BackgroundAction<RefPtr<GraphicsBitmap>>::create(
[path] { [path] {
return render_thumbnail(path); return render_thumbnail(path);
}, },
[this, path](auto thumbnail) { [this, path, directory_model](auto thumbnail) {
s_thumbnail_cache.set(path, move(thumbnail)); s_thumbnail_cache.set(path, move(thumbnail));
// class was destroyed, no need to update progress or call any event handlers.
if (directory_model.is_null())
return;
m_thumbnail_progress++; m_thumbnail_progress++;
if (on_thumbnail_progress) if (on_thumbnail_progress)
on_thumbnail_progress(m_thumbnail_progress, m_thumbnail_progress_total); on_thumbnail_progress(m_thumbnail_progress, m_thumbnail_progress_total);

3
Libraries/LibGUI/GDirectoryModel.h
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@ -5,7 +5,8 @@
#include <LibGUI/GModel.h> #include <LibGUI/GModel.h>
#include <sys/stat.h> #include <sys/stat.h>
class GDirectoryModel final : public GModel { class GDirectoryModel final : public GModel
, public Weakable<GDirectoryModel> {
public: public:
static NonnullRefPtr<GDirectoryModel> create() { return adopt(*new GDirectoryModel); } static NonnullRefPtr<GDirectoryModel> create() { return adopt(*new GDirectoryModel); }
virtual ~GDirectoryModel() override; virtual ~GDirectoryModel() override;