I can now display 10 slides.

main.cpp

@@ -5,25 +5,80 @@
 #include <deque>
 #include <iostream>
 #include <nlohmann/json.hpp>
+#include "dbc.hpp"
+#include <memory>
 
 constexpr const int WINDOW_WIDTH=1280;
 constexpr const int WINDOW_HEIGHT=720;
 constexpr const int FRAME_LIMIT=60;
 constexpr const bool VSYNC=true;
 
-using std::string, std::wstring;
+using std::string, std::wstring, std::shared_ptr, std::make_shared;
 using nlohmann::json;
 
+struct Slide {
+  guecs::UI $gui;
+  wstring $title;
+  wstring $content;
+  bool $initialized = false;
+
+  Slide(const string& title, const string& content) :
+    $title(guecs::to_wstring(title)),
+    $content(guecs::to_wstring(content))
+  {
+  }
+
+  void init(lel::Cell& cell) {
+    if(!$initialized) {
+      $initialized = true;
+
+      $gui.position(cell.x, cell.y, cell.w, cell.h);
+      $gui.layout(
+          "[=*%(300,200)title|_|_]"
+          "[_|_|_]"
+          "[=*%(300,300)content|_|_]"
+          "[_|_|_]"
+          "[_|_|_]");
+
+      auto title = $gui.entity("title");
+      $gui.set<guecs::Text>(title, {
+          $title, 124});
+
+      auto content = $gui.entity("content");
+      $gui.set<guecs::Text>(content, {
+          $content,
+          56, guecs::THEME.TEXT_COLOR, 20});
+
+      $gui.init();
+    }
+  }
+
+  void render(sf::RenderWindow& window) {
+    $gui.render(window);
+    // $gui.debug_layout(window);
+  }
+};
+
+using SlideDeck = std::vector<Slide>;
+
+
 struct SlidesUI {
   guecs::UI $gui;
+  shared_ptr<SlideDeck> $slides = nullptr;
+  size_t $current = 0;
+
+  SlidesUI(shared_ptr<SlideDeck> slides) {
+    dbc::check(slides != nullptr, "slides is null");
+    dbc::check(slides->size() > 0, "slide deck is empy");
+    $slides = slides;
+    $current = 0;
 
-  SlidesUI() {
     $gui.position(0, 0, WINDOW_WIDTH, WINDOW_HEIGHT);
     $gui.layout(
         "[t_left|t_center|t_right]"
-        "[m_left|*%(300,200)title|_|_|m_right]"
+        "[m_left|*%(300,400)slide|_|_|m_right]"
+        "[_|_|_|_|_]"
         "[_|_|_|_|_]"
-        "[_|*%(300,300)content|_|_|_]"
         "[_|_|_|_|_]"
         "[_|_|_|_|_]"
         "[b_left|b_center|b_right]"
@@ -35,37 +90,66 @@ struct SlidesUI {
     bg.set_color(guecs::THEME.BG_COLOR_DARK);
     $gui.set<guecs::Background>($gui.MAIN, bg);
 
-    auto title = $gui.entity("title");
+    show_slide();
-    $gui.set<guecs::Text>(title, {
-        L"Title Thing\n", 124});
-
-    auto content = $gui.entity("content");
-    $gui.set<guecs::Text>(content, {
-        L"* Sample 2\n"
-        L"* Sample 3\n",
-        56, guecs::THEME.TEXT_COLOR, 20});
 
     $gui.init();
   }
 
-  void set_data(json& data) {
+  Slide& current() {
-    (void)data;
+    return $slides->at($current);
+  }
+
+  void next_slide() {
+    if($current < $slides->size() - 1) {
+      $current++;
+      show_slide();
+    }
+  }
+
+  void prev_slide() {
+    if($current > 0) {
+      $current--;
+      show_slide();
+    }
+  }
+
+  void show_slide() {
+    auto& slide = current();
+    auto& cell = $gui.cell_for("slide");
+    slide.init(cell);
   }
 
   void render(sf::RenderWindow& window) {
     $gui.render(window);
+
+    auto& slide = current();
+    slide.render(window);
+
     // $gui.debug_layout(window);
   }
 
   void mouse(float x, float y, guecs::Modifiers mods) {
     $gui.mouse(x, y, mods);
+
+    if(mods.test(guecs::ModBit::left)) {
+      next_slide();
+    } else if(mods.test(guecs::ModBit::right)) {
+      prev_slide();
+    }
   }
 };
 
 
-json parse_slides(const std::string& md_file) {
+shared_ptr<SlideDeck> parse_slides(const string& md_file) {
+  shared_ptr<SlideDeck> slides = make_shared<SlideDeck>();
+
+  for(int i = 0; i < 10; i++) {
+    slides->emplace_back(fmt::format("Title {}", i),"content");
+  }
+
   (void)md_file;
-  return {};
+
+  return slides;
 }
 
 int main() {
@@ -77,9 +161,8 @@ int main() {
   window.setVerticalSyncEnabled(VSYNC);
 
   auto data = parse_slides("some_bullshit.md");
-  SlidesUI slides;
+  SlidesUI slides(data);
   slides.init();
-  slides.set_data(data);
 
   while(window.isOpen()) {
     while (const auto event = window.pollEvent()) {
@@ -88,9 +171,12 @@ int main() {
       }
 
       if(const auto* mouse = event->getIf<sf::Event::MouseButtonPressed>()) {
+        sf::Vector2f pos = window.mapPixelToCoords(mouse->position);
+
         if(mouse->button == sf::Mouse::Button::Left) {
-          sf::Vector2f pos = window.mapPixelToCoords(mouse->position);
+          slides.mouse(pos.x, pos.y, {1 << guecs::ModBit::left});
-          slides.mouse(pos.x, pos.y, {});
+        } else if(mouse->button == sf::Mouse::Button::Right) {
+          slides.mouse(pos.x, pos.y, {1 << guecs::ModBit::right});
         }
       }
     }