A simple visualization of a flat list is done.

src/list.c

@@ -4,6 +4,7 @@
 #include <SDL2/SDL_surface.h>
 #include <SDL2/SDL_ttf.h>
 #include <stdlib.h>
+#include <string.h>
 
 #define DEFAULTLISTSIZE 64
 #define MINWIDTH 100
@@ -38,11 +39,14 @@ void AddStringToList(char* text, List* list) {
 
 void ListFontSizeHasChanged(SDL_Renderer* renderer, TTF_Font* font, List* list) {
     TextureDetails* details = GetTextureFromCache(list->TextureCache, 0);
+    char buffer[100] = { 0 };
+
+    snprintf(buffer, sizeof(buffer), "Character Pointer Array Start: %p | Struct, List (Flat Array)", list->Strings[0]);
 
     SDL_Rect textSize;
 
-    TTF_SizeUTF8(font, "List (Array)", &textSize.w, &textSize.h);
-    SDL_Surface* surface = TTF_RenderText_Shaded(font, "List (Array)", (SDL_Color){255, 255, 255, 0}, (SDL_Color){0, 0, 0, 0});
+    TTF_SizeUTF8(font, buffer, &textSize.w, &textSize.h);
+    SDL_Surface* surface = TTF_RenderText_Shaded(font, buffer, (SDL_Color){255, 255, 255, 0}, (SDL_Color){0, 0, 0, 0});
 
     SDL_Texture* tex = SDL_CreateTextureFromSurface(renderer, surface);
 
@@ -52,13 +56,17 @@ void ListFontSizeHasChanged(SDL_Renderer* renderer, TTF_Font* font, List* list)
     else details = AddTextureToCache(tex, textSize, list->TextureCache);
 
     for (int i = 0; i < list->Size; i++) {
+        memset(buffer, '\0', 100);
+
         TextureDetails* details = GetTextureFromCache(list->TextureCache, i+1);
         char* item = list->Strings[i];
 
+        snprintf(buffer, sizeof(buffer), "%p: %s", item, item);
+
         SDL_Rect textSize;
 
-        TTF_SizeUTF8(font, item, &textSize.w, &textSize.h);
-        SDL_Surface* surface = TTF_RenderText_Shaded(font, item, (SDL_Color){255, 255, 255, 0}, (SDL_Color){0, 0, 0, 0});
+        TTF_SizeUTF8(font, buffer, &textSize.w, &textSize.h);
+        SDL_Surface* surface = TTF_RenderText_Shaded(font, buffer, (SDL_Color){255, 255, 255, 0}, (SDL_Color){0, 0, 0, 0});
 
         SDL_Texture* tex = SDL_CreateTextureFromSurface(renderer, surface);
 
@@ -69,43 +77,52 @@ void ListFontSizeHasChanged(SDL_Renderer* renderer, TTF_Font* font, List* list)
     }
 }
 
-void RenderStructHeader(SDL_Renderer* renderer, TTF_Font* font, unsigned short fontSize, SDL_FRect* cursor, TextureFontCache* cache) {
-    TextureDetails* details = GetTextureFromCache(cache, 0);
-    
+void RenderStructHeader(SDL_Renderer* renderer, SDL_FRect* cursor, List* list) {
+    TextureDetails* details = GetTextureFromCache(list->TextureCache, 0);
+    SDL_FRect textPosition;
 
+    textPosition.x = list->BoundingBox.x + list->BoundingBox.w * .50 - details->TextSize.w * .50;
+    textPosition.y = details->TextSize.h * .50 + list->BoundingBox.y;
+    textPosition.w = details->TextSize.w;
+    textPosition.h = details->TextSize.h;
+    
+    SDL_FRect headerBounds = {list->BoundingBox.x, list->BoundingBox.y, list->BoundingBox.w, textPosition.h * 2};
+
+    SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0);
+    
+    SDL_RenderFillRectF(renderer, &headerBounds);
+
+    SDL_SetRenderDrawColor(renderer, 255, 255, 255, 0);
+
+    SDL_RenderDrawRectF(renderer, &headerBounds);
+
+    SDL_RenderCopyF(renderer, details->Texture, NULL, &textPosition);
+
+    cursor->y = headerBounds.h;
 }
 
 void RenderList(SDL_Renderer* renderer, SDL_Point motion, List* list) {
     //SDL_Surface* surface = TTF_RenderText_Blended_Wrapped(font, list->Strings[0], (SDL_Color){255, 255, 255, 0}, 90);
-    TextureDetails* details = GetTextureFromCache(list->TextureCache, 0);
+    //TextureDetails* details = GetTextureFromCache(list->TextureCache, 0);
     SDL_FRect contentsBox = { .x = list->BoundingBox.x + list->BoundingBox.w * .125, .y = list->BoundingBox.y, .w = list->BoundingBox.w * 0.75, .h = list->BoundingBox.h * 0.15 };
 
-    SDL_RenderDrawRectF(renderer, &list->BoundingBox);
+    RenderStructHeader(renderer, &contentsBox, list);
+
+    SDL_SetRenderDrawColor(renderer, 255, 0, 0, 0);
+
+    //SDL_RenderDrawRectF(renderer, &list->BoundingBox);
 
     for (int i = 0; i < list->Size; i++) {
-        SDL_RenderDrawRectF(renderer, &contentsBox);        
+        //SDL_RenderDrawRectF(renderer, &contentsBox);        
         TextureDetails* details = GetTextureFromCache(list->TextureCache, i + 1);
 
-        SDL_FRect textArea;
-        textArea.x = contentsBox.x + contentsBox.w * 0.50 - details->TextSize.w * 0.50;
-        textArea.y = contentsBox.h * ( i + 1 );
-        textArea.w = details->TextSize.w;
-        textArea.h = details->TextSize.h;
+        //SDL_FRect textArea;
+        contentsBox.x = contentsBox.x + contentsBox.w * 0.50 - details->TextSize.w * 0.50;
+        contentsBox.w = details->TextSize.w;
+        contentsBox.h = details->TextSize.h;
 
-        SDL_RenderCopyF(renderer, details->Texture, NULL, &textArea);
+        SDL_RenderCopyF(renderer, details->Texture, NULL, &contentsBox);
+
+        contentsBox.y += details->TextSize.h * 1.15; // text.h * ( i + 1 );        
     }
-
-    SDL_FRect size;
-
-    float y = list->BoundingBox.y + motion.y - details->TextSize.h;
-
-    if (y < list->BoundingBox.y) y = 0;
-    else if (y > list->BoundingBox.h) y = list->BoundingBox.h - details->TextSize.h;
-
-    size.x = contentsBox.x;
-    size.y = y;
-    size.h = details->TextSize.h;
-    size.w = details->TextSize.w;
-
-    SDL_RenderCopyF(renderer, details->Texture, NULL, &size);
 }

src/main.c

@@ -121,8 +121,14 @@ int main(int argc, char** argv){
 
     SDL_FRect boundingBox = {SCREEN_WIDTH * 0.25, 0, SCREEN_WIDTH * 0.50, SCREEN_HEIGHT};
 
-    List* list = CreateList(boundingBox);
+    List* list = CreateList((SDL_FRect) {0, 0, SCREEN_WIDTH, SCREEN_HEIGHT});
     AddStringToList("Hello World!", list);
+    AddStringToList("Hello World!1", list);
+    AddStringToList("Hello World!2", list);
+    AddStringToList("Hello World!3", list);
+    AddStringToList("Hello World! 4", list);
+    AddStringToList("Hello World! 4 more stings! all the entries", list);
+    AddStringToList("Hello World! 4 and a reallly long sting", list);
 
     ListFontSizeHasChanged(app.renderer, GetFont(app.DefaultFontSize, app.FontCache), list);