SystemMonitor: Convert most widgets to a failable factory

I didn't convert widgets that don't do any failable tasks currently
or are lazy-initialized.

Userland/Applications/SystemMonitor/ProcessFileDescriptorMapWidget.cpp

@@ -15,34 +15,37 @@ REGISTER_WIDGET(SystemMonitor, ProcessFileDescriptorMapWidget)
 
 namespace SystemMonitor {
 
-ProcessFileDescriptorMapWidget::ProcessFileDescriptorMapWidget()
+ErrorOr<NonnullRefPtr<ProcessFileDescriptorMapWidget>> ProcessFileDescriptorMapWidget::try_create()
 {
-    set_layout<GUI::VerticalBoxLayout>(4);
-    m_table_view = add<GUI::TableView>();
+    auto widget = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) ProcessFileDescriptorMapWidget()));
+    TRY(widget->try_set_layout<GUI::VerticalBoxLayout>(4));
+    widget->m_table_view = TRY(widget->try_add<GUI::TableView>());
 
     Vector<GUI::JsonArrayModel::FieldSpec> pid_fds_fields;
-    pid_fds_fields.empend("fd", "FD"_short_string, Gfx::TextAlignment::CenterRight);
-    pid_fds_fields.empend("class", "Class"_short_string, Gfx::TextAlignment::CenterLeft);
-    pid_fds_fields.empend("offset", "Offset"_short_string, Gfx::TextAlignment::CenterRight);
-    pid_fds_fields.empend("absolute_path", "Path"_short_string, Gfx::TextAlignment::CenterLeft);
-    pid_fds_fields.empend("Access"_short_string, Gfx::TextAlignment::CenterLeft, [](auto& object) {
+    TRY(pid_fds_fields.try_empend("fd", "FD"_short_string, Gfx::TextAlignment::CenterRight));
+    TRY(pid_fds_fields.try_empend("class", "Class"_short_string, Gfx::TextAlignment::CenterLeft));
+    TRY(pid_fds_fields.try_empend("offset", "Offset"_short_string, Gfx::TextAlignment::CenterRight));
+    TRY(pid_fds_fields.try_empend("absolute_path", "Path"_short_string, Gfx::TextAlignment::CenterLeft));
+    TRY(pid_fds_fields.try_empend("Access"_short_string, Gfx::TextAlignment::CenterLeft, [](auto& object) {
         return object.get_bool("seekable"sv).value_or(false) ? "Seekable" : "Sequential";
-    });
-    pid_fds_fields.empend("Blocking"_string.release_value_but_fixme_should_propagate_errors(), Gfx::TextAlignment::CenterLeft, [](auto& object) {
+    }));
+    TRY(pid_fds_fields.try_empend(TRY("Blocking"_string), Gfx::TextAlignment::CenterLeft, [](auto& object) {
         return object.get_bool("blocking"sv).value_or(false) ? "Blocking" : "Nonblocking";
-    });
-    pid_fds_fields.empend("On exec"_short_string, Gfx::TextAlignment::CenterLeft, [](auto& object) {
+    }));
+    TRY(pid_fds_fields.try_empend("On exec"_short_string, Gfx::TextAlignment::CenterLeft, [](auto& object) {
         return object.get_bool("cloexec"sv).value_or(false) ? "Close" : "Keep";
-    });
-    pid_fds_fields.empend("Can read"_string.release_value_but_fixme_should_propagate_errors(), Gfx::TextAlignment::CenterLeft, [](auto& object) {
+    }));
+    TRY(pid_fds_fields.try_empend(TRY("Can read"_string), Gfx::TextAlignment::CenterLeft, [](auto& object) {
         return object.get_bool("can_read"sv).value_or(false) ? "Yes" : "No";
-    });
-    pid_fds_fields.empend("Can write"_string.release_value_but_fixme_should_propagate_errors(), Gfx::TextAlignment::CenterLeft, [](auto& object) {
+    }));
+    TRY(pid_fds_fields.try_empend(TRY("Can write"_string), Gfx::TextAlignment::CenterLeft, [](auto& object) {
         return object.get_bool("can_write"sv).value_or(false) ? "Yes" : "No";
-    });
+    }));
 
-    m_model = GUI::JsonArrayModel::create({}, move(pid_fds_fields));
-    m_table_view->set_model(MUST(GUI::SortingProxyModel::create(*m_model)));
+    widget->m_model = GUI::JsonArrayModel::create({}, move(pid_fds_fields));
+    widget->m_table_view->set_model(TRY(GUI::SortingProxyModel::create(*widget->m_model)));
+
+    return widget;
 }
 
 void ProcessFileDescriptorMapWidget::set_pid(pid_t pid)

Userland/Applications/SystemMonitor/ProcessFileDescriptorMapWidget.h

@@ -12,15 +12,17 @@
 namespace SystemMonitor {
 
 class ProcessFileDescriptorMapWidget final : public GUI::Widget {
-    C_OBJECT(ProcessFileDescriptorMapWidget);
+    C_OBJECT_ABSTRACT(ProcessFileDescriptorMapWidget)
 
 public:
     virtual ~ProcessFileDescriptorMapWidget() override = default;
 
+    static ErrorOr<NonnullRefPtr<ProcessFileDescriptorMapWidget>> try_create();
+
     void set_pid(pid_t);
 
 private:
-    ProcessFileDescriptorMapWidget();
+    ProcessFileDescriptorMapWidget() = default;
 
     RefPtr<GUI::TableView> m_table_view;
     RefPtr<GUI::JsonArrayModel> m_model;

Userland/Applications/SystemMonitor/ProcessMemoryMapWidget.cpp

@@ -49,19 +49,21 @@ public:
     }
 };
 
-ProcessMemoryMapWidget::ProcessMemoryMapWidget()
+ErrorOr<NonnullRefPtr<ProcessMemoryMapWidget>> ProcessMemoryMapWidget::try_create()
 {
-    set_layout<GUI::VerticalBoxLayout>(4);
-    m_table_view = add<GUI::TableView>();
+    auto widget = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) ProcessMemoryMapWidget()));
+    TRY(widget->try_set_layout<GUI::VerticalBoxLayout>(4));
+    widget->m_table_view = TRY(widget->try_add<GUI::TableView>());
+
     Vector<GUI::JsonArrayModel::FieldSpec> pid_vm_fields;
-    pid_vm_fields.empend(
+    TRY(pid_vm_fields.try_empend(
         "Address"_short_string, Gfx::TextAlignment::CenterLeft,
         [](auto& object) { return DeprecatedString::formatted("{:p}", object.get_u64("address"sv).value_or(0)); },
-        [](auto& object) { return object.get_u64("address"sv).value_or(0); });
-    pid_vm_fields.empend("size", "Size"_short_string, Gfx::TextAlignment::CenterRight);
-    pid_vm_fields.empend("amount_resident", "Resident"_string.release_value_but_fixme_should_propagate_errors(), Gfx::TextAlignment::CenterRight);
-    pid_vm_fields.empend("amount_dirty", "Dirty"_short_string, Gfx::TextAlignment::CenterRight);
-    pid_vm_fields.empend("Access"_short_string, Gfx::TextAlignment::CenterLeft, [](auto& object) {
+        [](auto& object) { return object.get_u64("address"sv).value_or(0); }));
+    TRY(pid_vm_fields.try_empend("size", "Size"_short_string, Gfx::TextAlignment::CenterRight));
+    TRY(pid_vm_fields.try_empend("amount_resident", TRY("Resident"_string), Gfx::TextAlignment::CenterRight));
+    TRY(pid_vm_fields.try_empend("amount_dirty", "Dirty"_short_string, Gfx::TextAlignment::CenterRight));
+    TRY(pid_vm_fields.try_empend("Access"_short_string, Gfx::TextAlignment::CenterLeft, [](auto& object) {
         StringBuilder builder;
         if (object.get_bool("readable"sv).value_or(false))
             builder.append('R');
@@ -76,20 +78,20 @@ ProcessMemoryMapWidget::ProcessMemoryMapWidget()
         if (object.get_bool("stack"sv).value_or(false))
             builder.append('T');
         return builder.to_deprecated_string();
-    });
-    pid_vm_fields.empend("VMObject type"_string.release_value_but_fixme_should_propagate_errors(), Gfx::TextAlignment::CenterLeft, [](auto& object) {
+    }));
+    TRY(pid_vm_fields.try_empend(TRY("VMObject type"_string), Gfx::TextAlignment::CenterLeft, [](auto& object) {
         auto type = object.get_deprecated_string("vmobject"sv).value_or({});
         if (type.ends_with("VMObject"sv))
             type = type.substring(0, type.length() - 8);
         return type;
-    });
-    pid_vm_fields.empend("Purgeable"_string.release_value_but_fixme_should_propagate_errors(), Gfx::TextAlignment::CenterLeft, [](auto& object) {
+    }));
+    TRY(pid_vm_fields.try_empend(TRY("Purgeable"_string), Gfx::TextAlignment::CenterLeft, [](auto& object) {
         if (object.get_bool("volatile"sv).value_or(false))
             return "Volatile";
         return "Non-volatile";
-    });
-    pid_vm_fields.empend(
-        "Page map"_string.release_value_but_fixme_should_propagate_errors(), Gfx::TextAlignment::CenterLeft,
+    }));
+    TRY(pid_vm_fields.try_empend(
+        TRY("Page map"_string), Gfx::TextAlignment::CenterLeft,
         [](auto&) {
             return GUI::Variant();
         },
@@ -99,17 +101,19 @@ ProcessMemoryMapWidget::ProcessMemoryMapWidget()
         [](JsonObject const& object) {
             auto pagemap = object.get_deprecated_string("pagemap"sv).value_or({});
             return pagemap;
-        });
-    pid_vm_fields.empend("cow_pages", "# CoW"_short_string, Gfx::TextAlignment::CenterRight);
-    pid_vm_fields.empend("name", "Name"_short_string, Gfx::TextAlignment::CenterLeft);
-    m_json_model = GUI::JsonArrayModel::create({}, move(pid_vm_fields));
-    m_table_view->set_model(MUST(GUI::SortingProxyModel::create(*m_json_model)));
+        }));
+    TRY(pid_vm_fields.try_empend("cow_pages", "# CoW"_short_string, Gfx::TextAlignment::CenterRight));
+    TRY(pid_vm_fields.try_empend("name", "Name"_short_string, Gfx::TextAlignment::CenterLeft));
+    widget->m_json_model = GUI::JsonArrayModel::create({}, move(pid_vm_fields));
+    widget->m_table_view->set_model(TRY(GUI::SortingProxyModel::create(*widget->m_json_model)));
 
-    m_table_view->set_column_painting_delegate(7, make<PagemapPaintingDelegate>());
+    widget->m_table_view->set_column_painting_delegate(7, TRY(try_make<PagemapPaintingDelegate>()));
 
-    m_table_view->set_key_column_and_sort_order(0, GUI::SortOrder::Ascending);
-    m_timer = add<Core::Timer>(1000, [this] { refresh(); });
-    m_timer->start();
+    widget->m_table_view->set_key_column_and_sort_order(0, GUI::SortOrder::Ascending);
+    widget->m_timer = TRY(widget->try_add<Core::Timer>(1000, [widget] { widget->refresh(); }));
+    widget->m_timer->start();
+
+    return widget;
 }
 
 void ProcessMemoryMapWidget::set_pid(pid_t pid)

Userland/Applications/SystemMonitor/ProcessMemoryMapWidget.h

@@ -12,16 +12,19 @@
 namespace SystemMonitor {
 
 class ProcessMemoryMapWidget final : public GUI::Widget {
-    C_OBJECT(ProcessMemoryMapWidget);
+    C_OBJECT_ABSTRACT(ProcessMemoryMapWidget);
 
 public:
     virtual ~ProcessMemoryMapWidget() override = default;
 
+    static ErrorOr<NonnullRefPtr<ProcessMemoryMapWidget>> try_create();
+
     void set_pid(pid_t);
     void refresh();
 
 private:
-    ProcessMemoryMapWidget();
+    ProcessMemoryMapWidget() = default;
+
     RefPtr<GUI::TableView> m_table_view;
     RefPtr<GUI::JsonArrayModel> m_json_model;
     pid_t m_pid { -1 };

Userland/Applications/SystemMonitor/ProcessStateWidget.cpp

@@ -93,13 +93,15 @@ private:
     pid_t m_pid { -1 };
 };
 
-ProcessStateWidget::ProcessStateWidget()
+ErrorOr<NonnullRefPtr<ProcessStateWidget>> ProcessStateWidget::try_create()
 {
-    set_layout<GUI::VerticalBoxLayout>(4);
-    m_table_view = add<GUI::TableView>();
-    m_table_view->set_model(adopt_ref(*new ProcessStateModel(ProcessModel::the(), 0)));
-    m_table_view->column_header().set_visible(false);
-    m_table_view->column_header().set_section_size(0, 90);
+    auto widget = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) ProcessStateWidget()));
+    TRY(widget->try_set_layout<GUI::VerticalBoxLayout>(4));
+    widget->m_table_view = TRY(widget->try_add<GUI::TableView>());
+    widget->m_table_view->set_model(TRY(try_make_ref_counted<ProcessStateModel>(ProcessModel::the(), 0)));
+    widget->m_table_view->column_header().set_visible(false);
+    widget->m_table_view->column_header().set_section_size(0, 90);
+    return widget;
 }
 
 void ProcessStateWidget::set_pid(pid_t pid)

Userland/Applications/SystemMonitor/ProcessStateWidget.h

@@ -12,15 +12,18 @@
 namespace SystemMonitor {
 
 class ProcessStateWidget final : public GUI::Widget {
-    C_OBJECT(ProcessStateWidget);
+    C_OBJECT_ABSTRACT(ProcessStateWidget);
 
 public:
     virtual ~ProcessStateWidget() override = default;
 
+    static ErrorOr<NonnullRefPtr<ProcessStateWidget>> try_create();
+
     void set_pid(pid_t);
 
 private:
-    ProcessStateWidget();
+    ProcessStateWidget() = default;
+
     RefPtr<GUI::TableView> m_table_view;
 };
 

Userland/Applications/SystemMonitor/ProcessUnveiledPathsWidget.cpp

@@ -16,17 +16,19 @@ REGISTER_WIDGET(SystemMonitor, ProcessUnveiledPathsWidget)
 
 namespace SystemMonitor {
 
-ProcessUnveiledPathsWidget::ProcessUnveiledPathsWidget()
+ErrorOr<NonnullRefPtr<ProcessUnveiledPathsWidget>> ProcessUnveiledPathsWidget::try_create()
 {
-    set_layout<GUI::VerticalBoxLayout>(4);
-    m_table_view = add<GUI::TableView>();
+    auto widget = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) ProcessUnveiledPathsWidget()));
+    TRY(widget->try_set_layout<GUI::VerticalBoxLayout>(4));
+    widget->m_table_view = TRY(widget->try_add<GUI::TableView>());
 
     Vector<GUI::JsonArrayModel::FieldSpec> pid_unveil_fields;
-    pid_unveil_fields.empend("path", "Path"_short_string, Gfx::TextAlignment::CenterLeft);
-    pid_unveil_fields.empend("permissions", "Permissions"_string.release_value_but_fixme_should_propagate_errors(), Gfx::TextAlignment::CenterLeft);
+    TRY(pid_unveil_fields.try_empend("path", "Path"_short_string, Gfx::TextAlignment::CenterLeft));
+    TRY(pid_unveil_fields.try_empend("permissions", TRY("Permissions"_string), Gfx::TextAlignment::CenterLeft));
 
-    m_model = GUI::JsonArrayModel::create({}, move(pid_unveil_fields));
-    m_table_view->set_model(MUST(GUI::SortingProxyModel::create(*m_model)));
+    widget->m_model = GUI::JsonArrayModel::create({}, move(pid_unveil_fields));
+    widget->m_table_view->set_model(TRY(GUI::SortingProxyModel::create(*widget->m_model)));
+    return widget;
 }
 
 void ProcessUnveiledPathsWidget::set_pid(pid_t pid)

Userland/Applications/SystemMonitor/ProcessUnveiledPathsWidget.h

@@ -12,15 +12,17 @@
 namespace SystemMonitor {
 
 class ProcessUnveiledPathsWidget final : public GUI::Widget {
-    C_OBJECT(ProcessUnveiledPathsWidget);
+    C_OBJECT_ABSTRACT(ProcessUnveiledPathsWidget);
 
 public:
     virtual ~ProcessUnveiledPathsWidget() override = default;
 
+    static ErrorOr<NonnullRefPtr<ProcessUnveiledPathsWidget>> try_create();
+
     void set_pid(pid_t);
 
 private:
-    ProcessUnveiledPathsWidget();
+    ProcessUnveiledPathsWidget() = default;
 
     RefPtr<GUI::TableView> m_table_view;
     RefPtr<GUI::JsonArrayModel> m_model;

Userland/Applications/SystemMonitor/ThreadStackWidget.cpp

@@ -71,11 +71,13 @@ private:
     Vector<Symbolication::Symbol> m_symbols;
 };
 
-ThreadStackWidget::ThreadStackWidget()
+ErrorOr<NonnullRefPtr<ThreadStackWidget>> ThreadStackWidget::try_create()
 {
-    set_layout<GUI::VerticalBoxLayout>(4);
-    m_stack_table = add<GUI::TableView>();
-    m_stack_table->set_model(adopt_ref(*new ThreadStackModel()));
+    auto widget = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) ThreadStackWidget()));
+    TRY(widget->try_set_layout<GUI::VerticalBoxLayout>(4));
+    widget->m_stack_table = TRY(widget->try_add<GUI::TableView>());
+    widget->m_stack_table->set_model(TRY(try_make_ref_counted<ThreadStackModel>()));
+    return widget;
 }
 
 void ThreadStackWidget::show_event(GUI::ShowEvent&)

Userland/Applications/SystemMonitor/ThreadStackWidget.h

@@ -13,15 +13,17 @@
 namespace SystemMonitor {
 
 class ThreadStackWidget final : public GUI::Widget {
-    C_OBJECT(ThreadStackWidget)
+    C_OBJECT_ABSTRACT(ThreadStackWidget)
 public:
     virtual ~ThreadStackWidget() override = default;
 
+    static ErrorOr<NonnullRefPtr<ThreadStackWidget>> try_create();
+
     void set_ids(pid_t pid, pid_t tid);
     void refresh();
 
 private:
-    ThreadStackWidget();
+    ThreadStackWidget() = default;
 
     virtual void show_event(GUI::ShowEvent&) override;
     virtual void hide_event(GUI::HideEvent&) override;