The layout is now configured in a .json file so you can change it.

assets/layouts.json

@@ -0,0 +1,22 @@
+{
+  "default_ui": [
+      "[t_left|t_center|t_right]",
+      "[*%(300,500)slide|_|_|*%(200,500)alternate|_]",
+      "[_|_|_|_|_]",
+      "[_|_|_|_|_]",
+      "[_|_|_|_|_]",
+      "[_|_|_|_|_]",
+      "[_]",
+      "[title|*%(200,100)description|_|_|_]"
+  ],
+  "default_slide": [
+        "[=*%(300,200)title|_|_]",
+        "[_|_|_]",
+        "[*%(300,600)content|_|_]",
+        "[_|_|_]",
+        "[_|_|_]",
+        "[_|_|_]",
+        "[_|_|_]",
+        "[_|_|_]"
+  ]
+}

meson.build

@@ -1,7 +1,7 @@
 # clang might need _LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
 
 project('bezos-loves-slides', 'cpp',
-  version: '0.1.0',
+  version: '0.2.0',
   default_options: [
     'cpp_std=c++20',
     'cpp_args=-D_GLIBCXX_DEBUG=1 -D_GLIBCXX_DEBUG_PEDANTIC=1',
@@ -76,13 +76,14 @@ sfml_system = subproject('sfml').get_variable('sfml_system_dep')
 sfml_window = subproject('sfml').get_variable('sfml_window_dep')
 lel_guecs = subproject('lel-guecs').get_variable('lel_guecs_dep')
 lel_guecs_sfml = subproject('lel-guecs').get_variable('lel_guecs_sfml_dep')
+utf8cpp = subproject('utf8cpp').get_variable('utf8cpp_dep')
 
 dependencies += [
   fmt, json, freetype2,
   flac, ogg, vorbis, vorbisfile, vorbisenc,
   sfml_audio, sfml_graphics,
   sfml_network, sfml_system,
-  sfml_window, lel_guecs, lel_guecs_sfml
+  sfml_window, lel_guecs, lel_guecs_sfml, utf8cpp
 ]
 
 

sample/about-bezos.md

@@ -1,7 +1,8 @@
 {
   "title": "How to use Bezos",
   "description": "A short presentation on Bezos.",
-  "font_file": "assets/bold.otf"
+  "font_file": "assets/bold.otf",
+  "layouts": "assets/layouts.json"
 }
 ===
 # Bezos Slide Format

src/slides_ui.cpp

@@ -3,6 +3,7 @@
 #include <fmt/xchar.h>
 #include <deque>
 #include <iostream>
+#include <fstream>
 #include <nlohmann/json.hpp>
 #include "dbc.hpp"
 #include <memory>
@@ -25,20 +26,12 @@ Slide::Slide(const string& title, const string& content, json& config, json& dec
   config_text($content_font, $config);
 }
 
-void Slide::init(lel::Cell& cell) {
+void Slide::init(lel::Cell& cell, const std::string& layout) {
   if(!$initialized) {
     $initialized = true;
 
     $gui.position(cell.x, cell.y, cell.w, cell.h);
-    $gui.layout(
-        "[=*%(300,200)title|_|_]"
-        "[_|_|_]"
-        "[*%(300,600)content|_|_]"
-        "[_|_|_]"
-        "[_|_|_]"
-        "[_|_|_]"
-        "[_|_|_]"
-        "[_|_|_]");
+    $gui.layout(layout);
 
     auto title = $gui.entity("title");
     $gui.set<guecs::Text>(title, $title_font);
@@ -82,6 +75,7 @@ SlidesUI::SlidesUI(shared_ptr<SlideDeck> deck) {
   dbc::check(deck->slides.size() > 0, "slide deck is empy");
   $deck = deck;
   $current = 0;
+  configure_layouts();
 }
 
 void SlidesUI::set_text(const std::string& name) {
@@ -98,16 +92,7 @@ void SlidesUI::set_text(const std::string& name) {
 
 void SlidesUI::init() {
   $gui.position(0, 0, WINDOW_WIDTH, WINDOW_HEIGHT);
-  $gui.layout(
-      "[t_left|t_center|t_right]"
-      "[*%(300,500)slide|_|_|_|_]"
-      "[_|_|_|_|_]"
-      "[_|_|_|_|_]"
-      "[_|_|_|_|_]"
-      "[_|_|_|_|_]"
-      "[_]"
-      "[title|*%(200,100)description|_|_|_]"
-  );
+  $gui.layout($layouts["default_ui"]);
 
   set_text("title");
   set_text("description");
@@ -172,7 +157,8 @@ void SlidesUI::show_slide() {
   bg.init();
 
   auto& cell = $gui.cell_for("slide");
-  slide.init(cell);
+  auto& layout = $layouts["default_slide"];
+  slide.init(cell, layout);
 }
 
 void SlidesUI::render(sf::RenderWindow& window) {
@@ -204,3 +190,16 @@ void SlidesUI::handle_events(sf::RenderWindow& presenter, const sf::Event& event
     }
   }
 }
+
+void SlidesUI::configure_layouts() {
+  std::ifstream in_file{$deck->config["layouts"]};
+  json layout_config = json::parse(in_file);
+
+  for(auto& [name, layout_list] : layout_config.items()) {
+    std::string layout;
+    for(auto& line : layout_list) {
+      layout += line;
+    }
+    $layouts.try_emplace(name, layout);
+  }
+}

src/slides_ui.hpp

@@ -21,7 +21,7 @@ struct Slide {
 
   Slide() {}
 
-  void init(lel::Cell& cell);
+  void init(lel::Cell& cell, const std::string& layout);
   void render(sf::RenderWindow& window);
   void config_text(guecs::Text &result, nlohmann::json& config);
 };
@@ -36,6 +36,7 @@ struct SlideDeck {
 struct SlidesUI {
   guecs::UI $gui;
   std::shared_ptr<SlideDeck> $deck = nullptr;
+  std::unordered_map<std::string, std::string> $layouts;
   size_t $current = 0;
 
   SlidesUI(std::shared_ptr<SlideDeck> deck);
@@ -50,4 +51,5 @@ struct SlidesUI {
   void mouse(float x, float y, guecs::Modifiers mods);
   void set_text(const std::string& name);
   void handle_events(sf::RenderWindow& presenter, const sf::Event& event);
+  void configure_layouts();
 };

wraps/utf8cpp.wrap

@@ -0,0 +1,9 @@
+[wrap-git]
+directory=utf8cpp-4.0.9
+url=https://github.com/nemtrif/utfcpp.git
+revision=v4.0.9
+depth=1
+method=cmake
+
+[provide]
+utf8cpp = utf8cpp_dep