Extract pages into components

cli/component.cpp

@@ -0,0 +1,28 @@
+#include "component.hpp"
+
+namespace katja
+{
+    ftxui::Element WelcomePage::Render()
+    {
+        return ftxui::text("Select an action in the menu.");
+    }
+
+    UpdatesPage::UpdatesPage(std::vector<package_identifier>&& updatable)
+        : updatable(std::move(updatable))
+    {
+    }
+
+    ftxui::Element UpdatesPage::Render()
+    {
+        std::vector<std::shared_ptr<ftxui::Node>> lines;
+
+        for (const auto& package_identifier : this->updatable)
+        {
+            auto line = ftxui::text(package_identifier.to_string()) | color(ftxui::Color::SkyBlue2);
+            lines.push_back(line);
+        }
+        ftxui::Element summary = ftxui::text(" Updates (" + std::to_string(lines.size()) + ")");
+
+        return ftxui::window(summary, ftxui::vbox(lines));
+    }
+}

cli/component.hpp

@@ -6,28 +6,22 @@
 
 namespace katja
 {
-class UpdatesPage : public ftxui::ComponentBase
-{
-    std::vector<package_identifier> updatable;
-
-public:
-    explicit UpdatesPage(std::vector<package_identifier>&& updatable)
-        : updatable(std::move(updatable))
+    class WelcomePage final : public ftxui::ComponentBase
     {
-    }
+        ftxui::Element Render() override;
+    };
 
-    ftxui::Element Render() override
+    class UpdatesPage final : public ftxui::ComponentBase
     {
-        std::vector<std::shared_ptr<ftxui::Node>> lines;
+        std::vector<package_identifier> updatable;
 
-        for (const auto& package_identifier : this->updatable)
-        {
-            auto line = ftxui::text(package_identifier.to_string()) | color(ftxui::Color::SkyBlue2);
-            lines.push_back(line);
-        }
-        ftxui::Element summary = ftxui::text(" Updates (" + std::to_string(lines.size()) + ")");
+    public:
+        explicit UpdatesPage(std::vector<package_identifier>&& updatable);
 
-        return ftxui::window(summary, ftxui::vbox(lines));
-    }
-};
+        ftxui::Element Render() override;
+    };
+
+    class SearchPage final : public ftxui::ComponentBase
+    {
+    };
 }

cli/main.cpp

@@ -9,6 +9,46 @@
 #include "katja/database.hpp"
 #include "component.hpp"
 
+class MyContainer final : public ftxui::ComponentBase
+{
+public:
+    std::vector<std::string> menu_entries;
+    std::vector<ftxui::Component> menu_pages;
+    int menu_selected{ 0 };
+    ftxui::Component menu;
+    std::function<void()> on_enter;
+
+    MyContainer(std::vector<std::pair<std::string, ftxui::Component>> pages)
+    {
+        std::transform(std::cbegin(pages), std::cend(pages), std::back_inserter(this->menu_entries),
+                [](const std::pair<std::string, ftxui::Component>& pair) { return pair.first; });
+        std::transform(std::cbegin(pages), std::cend(pages), std::back_inserter(this->menu_pages),
+                [](const std::pair<std::string, ftxui::Component>& pair) { return pair.second; });
+
+        ftxui::MenuOption menu_option = ftxui::MenuOption::Horizontal();
+        menu = ftxui::Menu(&this->menu_entries, &this->menu_selected, menu_option);
+    }
+
+    ftxui::Element Render() override
+    {
+        return ftxui::vbox({
+            this->menu->Render(),
+            this->menu_pages.at(this->menu_selected)->Render()
+        });
+    }
+
+    bool OnEvent(ftxui::Event event) override
+    {
+        if (event.character() == "q")
+        {
+            on_enter();
+            return true;
+        }
+        return menu->OnEvent(event);
+    }
+};
+
+
 int main(int argc, const char **argv)
 {
     auto configuration = toml::parse("config/katja.toml");
@@ -21,22 +61,15 @@ int main(int argc, const char **argv)
         auto updates = repository.get_updates(installed_database);
 
         auto screen = ftxui::ScreenInteractive::Fullscreen();
-        std::vector<std::string> menu_entries = {
-            "Updates",
-            "Search",
-            "Quit"
-        };
-        int menu_selected = 0;
-        ftxui::MenuOption menu_option = ftxui::MenuOption::Horizontal();
-        menu_option.on_enter = screen.ExitLoopClosure();
-        ftxui::Component menu = ftxui::Menu(&menu_entries, &menu_selected, menu_option);
 
-        auto custom_component = std::make_shared<katja::UpdatesPage>(std::move(updates));
-        ftxui::Component renderer = ftxui::Container::Vertical({
-                menu,
-                custom_component
+        auto container = std::make_shared<MyContainer>(std::vector<std::pair<std::string, ftxui::Component>>{
+            { "Home", std::make_shared<katja::WelcomePage>() },
+            { "Updates", std::make_shared<katja::UpdatesPage>(std::move(updates)) },
+            { "Search", std::make_shared<katja::SearchPage>() }
         });
-        screen.Loop(renderer);
+        container->on_enter = screen.ExitLoopClosure();
+
+        screen.Loop(container);
     }
     return EXIT_SUCCESS;
 }