lazily initialize settings pages

src/widgets/dialogs/SettingsDialog.cpp

@@ -107,7 +107,8 @@ void SettingsDialog::filterElements(const QString &text)
     for (auto &&tab : this->tabs_)
     {
         // filterElements returns true if anything on the page matches the search query
-        tab->setVisible(tab->page()->filterElements(text));
+        tab->setVisible(tab->name().contains(text, Qt::CaseInsensitive) ||
+                        tab->page()->filterElements(text));
     }
 
     // find next visible page
@@ -157,36 +158,30 @@ void SettingsDialog::addTabs()
 
     this->ui_.tabContainer->setContentsMargins(0, 20, 0, 20);
 
-    this->addTab(new GeneralPage, ":/settings/about.svg");
-
+    // clang-format off
+    this->addTab([]{return new GeneralPage;},          "General",        ":/settings/about.svg");
     this->ui_.tabContainer->addSpacing(16);
-
-    this->addTab(new AccountsPage, ":/settings/accounts.svg");
-
+    this->addTab([]{return new AccountsPage;},         "Accounts",       ":/settings/accounts.svg");
     this->ui_.tabContainer->addSpacing(16);
-
-    this->addTab(new CommandPage, ":/settings/commands.svg");
-    this->addTab(new HighlightingPage, ":/settings/notifications.svg");
-    this->addTab(new IgnoresPage, ":/settings/ignore.svg");
-
+    this->addTab([]{return new CommandPage;},          "Commands",       ":/settings/commands.svg");
+    this->addTab([]{return new HighlightingPage;},     "Highlights",     ":/settings/notifications.svg");
+    this->addTab([]{return new IgnoresPage;},          "Ignores",        ":/settings/ignore.svg");
     this->ui_.tabContainer->addSpacing(16);
-
-    this->addTab(new KeyboardSettingsPage, ":/settings/keybinds.svg");
-    this->addTab(new ModerationPage, ":/settings/moderation.svg");
-    this->addTab(new NotificationPage, ":/settings/notification2.svg");
-    this->addTab(new ExternalToolsPage, ":/settings/externaltools.svg");
-
+    this->addTab([]{return new KeyboardSettingsPage;}, "Keybindings",    ":/settings/keybinds.svg");
+    this->addTab([]{return new ModerationPage;},       "Moderation",     ":/settings/moderation.svg");
+    this->addTab([]{return new NotificationPage;},     "Notifications",  ":/settings/notification2.svg");
+    this->addTab([]{return new ExternalToolsPage;},    "External tools", ":/settings/externaltools.svg");
     this->ui_.tabContainer->addStretch(1);
-    this->addTab(new AboutPage, ":/settings/about.svg", Qt::AlignBottom);
+    this->addTab([]{return new AboutPage;},            "About",          ":/settings/about.svg", Qt::AlignBottom);
+    // clang-format on
 }
 
-void SettingsDialog::addTab(SettingsPage *page, const QString &iconPath,
+void SettingsDialog::addTab(std::function<SettingsPage *()> page,
+                            const QString &name, const QString &iconPath,
                             Qt::Alignment alignment)
 {
-    auto tab = new SettingsDialogTab(this, page, iconPath);
-    page->setTab(tab);
+    auto tab = new SettingsDialogTab(this, std::move(page), name, iconPath);
 
-    this->ui_.pageStack->addWidget(page);
     this->ui_.tabContainer->addWidget(tab, 0, alignment);
     this->tabs_.push_back(tab);
 
@@ -198,6 +193,15 @@ void SettingsDialog::addTab(SettingsPage *page, const QString &iconPath,
 
 void SettingsDialog::selectTab(SettingsDialogTab *tab, bool byUser)
 {
+    // add page if it's not been added yet
+    [&] {
+        for (int i = 0; i < this->ui_.pageStack->count(); i++)
+            if (this->ui_.pageStack->itemAt(i)->widget() == tab->page())
+                return;
+
+        this->ui_.pageStack->addWidget(tab->page());
+    }();
+
     this->ui_.pageStack->setCurrentWidget(tab->page());
 
     if (this->selectedTab_ != nullptr)
@@ -231,18 +235,13 @@ SettingsDialogTab *SettingsDialog::tab(SettingsTabId id)
     return nullptr;
 }
 
-void SettingsDialog::selectPage(SettingsPage *page)
-{
-    assert(page);
-    assert(page->tab());
-
-    this->selectTab(page->tab());
-}
-
 void SettingsDialog::showDialog(SettingsDialogPreference preferredTab)
 {
     static SettingsDialog *instance = new SettingsDialog();
-    instance->refresh();
+    static bool hasShownBefore = false;
+    if (hasShownBefore)
+        instance->refresh();
+    hasShownBefore = true;
 
     switch (preferredTab)
     {

src/widgets/dialogs/SettingsDialog.hpp

@@ -6,6 +6,7 @@
 #include <QStackedLayout>
 #include <QVBoxLayout>
 #include <QWidget>
+#include <functional>
 #include <pajlada/settings/setting.hpp>
 #include "widgets/helper/SettingsDialogTab.hpp"
 
@@ -49,10 +50,10 @@ class SettingsDialog : public BaseWindow
 
     void initUi();
     void addTabs();
-    void addTab(SettingsPage *page, const QString &iconPath,
+    void addTab(std::function<SettingsPage *()> page, const QString &name,
+                const QString &iconPath,
                 Qt::Alignment alignment = Qt::AlignTop);
     void selectTab(SettingsDialogTab *tab, const bool byUser = true);
-    void selectPage(SettingsPage *page);
     void selectTab(SettingsTabId id);
     SettingsDialogTab *tab(SettingsTabId id);
     void filterElements(const QString &query);

src/widgets/helper/SettingsDialogTab.cpp

@@ -8,14 +8,16 @@
 namespace chatterino {
 
 SettingsDialogTab::SettingsDialogTab(SettingsDialog *_dialog,
-                                     SettingsPage *_page, QString imageFileName,
+                                     std::function<SettingsPage *()> _lazyPage,
+                                     const QString &name, QString imageFileName,
                                      SettingsTabId id)
     : BaseWidget(_dialog)
     , dialog_(_dialog)
-    , page_(_page)
+    , lazyPage_(std::move(_lazyPage))
     , id_(id)
+    , name_(name)
 {
-    this->ui_.labelText = page_->getName();
+    this->ui_.labelText = name;
     this->ui_.icon.addFile(imageFileName);
 
     this->setCursor(QCursor(Qt::PointingHandCursor));
@@ -38,6 +40,11 @@ void SettingsDialogTab::setSelected(bool _selected)
 
 SettingsPage *SettingsDialogTab::page()
 {
+    if (this->page_)
+        return this->page_;
+
+    this->page_ = this->lazyPage_();
+    this->page_->setTab(this);
     return this->page_;
 }
 
@@ -74,6 +81,11 @@ void SettingsDialogTab::mousePressEvent(QMouseEvent *event)
     this->setFocus();
 }
 
+const QString &SettingsDialogTab::name() const
+{
+    return name_;
+}
+
 SettingsTabId SettingsDialogTab::id() const
 {
     return id_;

src/widgets/helper/SettingsDialogTab.hpp

@@ -5,6 +5,7 @@
 #include <QIcon>
 #include <QPaintEvent>
 #include <QWidget>
+#include <functional>
 
 namespace chatterino {
 
@@ -22,13 +23,17 @@ class SettingsDialogTab : public BaseWidget
     Q_OBJECT
 
 public:
-    SettingsDialogTab(SettingsDialog *dialog_, SettingsPage *page_,
-                      QString imageFileName, SettingsTabId id = {});
+    SettingsDialogTab(SettingsDialog *dialog_,
+                      std::function<SettingsPage *()> page_,
+                      const QString &name, QString imageFileName,
+                      SettingsTabId id = {});
 
     void setSelected(bool selected_);
     SettingsPage *page();
     SettingsTabId id() const;
 
+    const QString &name() const;
+
 signals:
     void selectedChanged(bool);
 
@@ -42,9 +47,11 @@ class SettingsDialogTab : public BaseWidget
     } ui_;
 
     // Parent settings dialog
-    SettingsDialog *dialog_;
-    SettingsPage *page_;
+    SettingsDialog *dialog_{};
+    SettingsPage *page_{};
+    std::function<SettingsPage *()> lazyPage_;
     SettingsTabId id_;
+    QString name_;
 
     bool selected_ = false;
 };

src/widgets/settingspages/AboutPage.cpp

@@ -18,7 +18,6 @@
 namespace chatterino {
 
 AboutPage::AboutPage()
-    : SettingsPage("About")
 {
     LayoutCreator<AboutPage> layoutCreator(this);
 

src/widgets/settingspages/AccountsPage.cpp

@@ -17,7 +17,6 @@
 namespace chatterino {
 
 AccountsPage::AccountsPage()
-    : SettingsPage("Accounts")
 {
     auto *app = getApp();
 

src/widgets/settingspages/CommandPage.cpp

@@ -33,7 +33,6 @@ namespace {
 }  // namespace
 
 CommandPage::CommandPage()
-    : SettingsPage("Commands")
 {
     auto app = getApp();
 

src/widgets/settingspages/ExternalToolsPage.cpp

@@ -12,7 +12,6 @@
 namespace chatterino {
 
 ExternalToolsPage::ExternalToolsPage()
-    : SettingsPage("External tools")
 {
     LayoutCreator<ExternalToolsPage> layoutCreator(this);
     auto layout = layoutCreator.setLayoutType<QVBoxLayout>();

src/widgets/settingspages/GeneralPage.cpp

@@ -237,7 +237,6 @@ bool SettingsLayout::filterElements(const QString &query)
 }
 
 GeneralPage::GeneralPage()
-    : SettingsPage("General")
 {
     auto y = new QVBoxLayout;
     auto scroll = new QScrollArea;
@@ -263,9 +262,7 @@ GeneralPage::GeneralPage()
 bool GeneralPage::filterElements(const QString &query)
 {
     if (this->settingsLayout_)
-        return this->settingsLayout_->filterElements(query) ||
-               this->name_.contains(query, Qt::CaseInsensitive) ||
-               query.isEmpty();
+        return this->settingsLayout_->filterElements(query) || query.isEmpty();
     else
         return false;
 }

src/widgets/settingspages/HighlightingPage.cpp

@@ -29,7 +29,6 @@
 namespace chatterino {
 
 HighlightingPage::HighlightingPage()
-    : SettingsPage("Highlights")
 {
     auto app = getApp();
     LayoutCreator<HighlightingPage> layoutCreator(this);

src/widgets/settingspages/IgnoresPage.cpp

@@ -29,7 +29,6 @@ static void addUsersTab(IgnoresPage &page, LayoutCreator<QVBoxLayout> box,
                         QStringListModel &model);
 
 IgnoresPage::IgnoresPage()
-    : SettingsPage("Ignores")
 {
     LayoutCreator<IgnoresPage> layoutCreator(this);
     auto layout = layoutCreator.setLayoutType<QVBoxLayout>();

src/widgets/settingspages/KeyboardSettingsPage.cpp

@@ -8,7 +8,6 @@
 namespace chatterino {
 
 KeyboardSettingsPage::KeyboardSettingsPage()
-    : SettingsPage("Keybindings")
 {
     auto layout =
         LayoutCreator<KeyboardSettingsPage>(this).setLayoutType<QVBoxLayout>();

src/widgets/settingspages/ModerationPage.cpp

@@ -73,7 +73,6 @@ QString fetchLogDirectorySize()
 }
 
 ModerationPage::ModerationPage()
-    : SettingsPage("Moderation")
 {
     auto app = getApp();
     LayoutCreator<ModerationPage> layoutCreator(this);

src/widgets/settingspages/NotificationPage.cpp

@@ -21,7 +21,6 @@
 namespace chatterino {
 
 NotificationPage::NotificationPage()
-    : SettingsPage("Notifications")
 {
     LayoutCreator<NotificationPage> layoutCreator(this);
     auto layout = layoutCreator.emplace<QVBoxLayout>().withoutMargin();

src/widgets/settingspages/SettingsPage.cpp

@@ -64,20 +64,13 @@ bool filterItemsRec(QObject *object, const QString &query)
     return any;
 }
 
-SettingsPage::SettingsPage(const QString &name)
-    : name_(name)
+SettingsPage::SettingsPage()
 {
 }
 
 bool SettingsPage::filterElements(const QString &query)
 {
-    return filterItemsRec(this, query) || query.isEmpty() ||
-           this->name_.contains(query, Qt::CaseInsensitive);
-}
-
-const QString &SettingsPage::getName()
-{
-    return this->name_;
+    return filterItemsRec(this, query) || query.isEmpty();
 }
 
 SettingsDialogTab *SettingsPage::tab() const

src/widgets/settingspages/SettingsPage.hpp

@@ -47,9 +47,7 @@ class SettingsPage : public QFrame
     Q_OBJECT
 
 public:
-    SettingsPage(const QString &name);
-
-    const QString &getName();
+    SettingsPage();
 
     virtual bool filterElements(const QString &query);
 
@@ -71,7 +69,6 @@ class SettingsPage : public QFrame
     }
 
 protected:
-    QString name_;
     SettingsDialogTab *tab_;
     pajlada::Signals::NoArgSignal onCancel_;
     std::vector<pajlada::Signals::ScopedConnection> managedConnections_;