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fix(memory leak): refactor NoBigComboStyle -> singleton

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Signed-off-by: Rachel Powers <508861+Ryex@users.noreply.github.com>
This commit is contained in:
Rachel Powers 2023-05-27 23:22:40 -07:00
parent c81cb59b4b
commit 37420405c7
1 changed files with 31 additions and 2 deletions
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33
launcher/ui/pages/instance/ManagedPackPage.cpp
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@ -41,8 +41,38 @@ class NoBigComboBoxStyle : public QProxyStyle {
return QProxyStyle::styleHint(hint, option, widget, returnData);
}
// clang-format on
static NoBigComboBoxStyle* GetInstance(QStyle* style);
private:
static QMap<QStyle*, NoBigComboBoxStyle*> s_singleton_instances_;
static std::mutex s_singleton_instances_mutex_;
};
QMap<QStyle*, NoBigComboBoxStyle*> NoBigComboBoxStyle::s_singleton_instances_ = {};
std::mutex NoBigComboBoxStyle::s_singleton_instances_mutex_;
/**
* QProxyStyle and QStyle objects object to being freed even if all the widgets using them are gone
* so make singlestons tied to the lifetime of the application to clean them up and ensure they arn't
* being remade over and over agian leaking memory.
* */
NoBigComboBoxStyle* NoBigComboBoxStyle::GetInstance(QStyle* style)
{
std::lock_guard<std::mutex> lock(s_singleton_instances_mutex_);
auto inst_iter = s_singleton_instances_.constFind(style);
NoBigComboBoxStyle* inst = nullptr;
if(inst_iter == s_singleton_instances_.constEnd() || *inst_iter == nullptr) {
inst = new NoBigComboBoxStyle(style);
inst->setParent(APPLICATION);
s_singleton_instances_.insert(style, inst);
qDebug() << "QProxyStyle NoBigComboBox created for" << style->objectName() << style;
} else {
inst = *inst_iter;
}
return inst;
}
ManagedPackPage* ManagedPackPage::createPage(BaseInstance* inst, QString type, QWidget* parent)
{
if (type == "modrinth")
@ -63,8 +93,7 @@ ManagedPackPage::ManagedPackPage(BaseInstance* inst, InstanceWindow* instance_wi
// NOTE: GTK2 themes crash with the proxy style.
// This seems like an upstream bug, so there's not much else that can be done.
if (!QStyleFactory::keys().contains("gtk2")){
auto comboStyle = new NoBigComboBoxStyle(ui->versionsComboBox->style());
comboStyle->setParent(APPLICATION); // make sure this gets cleaned up (setting to simply `this` causes it to be freed too soon)
auto comboStyle = NoBigComboBoxStyle::GetInstance(ui->versionsComboBox->style());
ui->versionsComboBox->setStyle(comboStyle);
}