create buffer list window that you can't interact with

src/core/core.odin

@@ -1,5 +1,7 @@
 package core
 
+import "vendor:raylib"
+
 Mode :: enum {
     Normal,
     Insert,
@@ -8,6 +10,13 @@ Mode :: enum {
 State :: struct {
     mode: Mode,
     should_close: bool,
-    buffers: [dynamic]FileBuffer,
+    screen_height: i32,
+    screen_width: i32,
+    font: raylib.Font,
+
     current_buffer: int,
+    buffers: [dynamic]FileBuffer,
+
+    buffer_list_window_is_visible: bool,
+    buffer_list_window_selected_buffer: int,
 }

src/core/file_buffer.odin

@@ -732,12 +732,17 @@ update_glyph_buffer :: proc(buffer: ^FileBuffer) {
     }
 }
 
-draw_file_buffer :: proc(state: ^State, buffer: ^FileBuffer, x: int, y: int, font: raylib.Font) {
+draw_file_buffer :: proc(state: ^State, buffer: ^FileBuffer, x: int, y: int, font: raylib.Font, show_line_numbers: bool = true) {
     update_glyph_buffer(buffer);
     color_buffer(buffer);
 
+    padding := 0;
+    if show_line_numbers {
+        padding = line_number_padding;
+    }
+
     begin := buffer.top_line;
-    cursor_x := x + line_number_padding + buffer.cursor.col * source_font_width;
+    cursor_x := x + padding + buffer.cursor.col * source_font_width;
     cursor_y := y + buffer.cursor.line * source_font_height;
 
     cursor_y -= begin * source_font_height;
@@ -760,7 +765,7 @@ draw_file_buffer :: proc(state: ^State, buffer: ^FileBuffer, x: int, y: int, fon
         }
 
         if num_line_break > 0 {
-            cursor_x = x + line_number_padding + line_length * source_font_width;
+            cursor_x = x + padding + line_length * source_font_width;
             cursor_y = cursor_y + num_line_break * source_font_height;
         } else {
             cursor_x += line_length * source_font_width;
@@ -772,11 +777,12 @@ draw_file_buffer :: proc(state: ^State, buffer: ^FileBuffer, x: int, y: int, fon
     for j in 0..<buffer.glyph_buffer_height {
         text_y := y + source_font_height * j;
 
-        // Line Numbers
+        if show_line_numbers {
             raylib.DrawTextEx(font, raylib.TextFormat("%d", begin + j + 1), raylib.Vector2 { f32(x), f32(text_y) }, source_font_height, 0, raylib.DARKGRAY);
+        }
 
         for i in 0..<buffer.glyph_buffer_width {
-            text_x := x + line_number_padding + i * source_font_width;
+            text_x := x + padding + i * source_font_width;
             glyph := buffer.glyph_buffer[i + j * buffer.glyph_buffer_width];
 
             if glyph.codepoint == 0 { break; }

src/main.odin

@@ -87,7 +87,9 @@ switch_to_buffer :: proc(state: ^State, item: ^ui.MenuBarItem) {
 }
 
 main :: proc() {
-    state: State;
+    state := State {
+        buffer_list_window_is_visible = true,
+    };
 
     for arg in os.args[1:] {
         buffer, err := core.new_file_buffer(context.allocator, arg);
@@ -114,6 +116,7 @@ main :: proc() {
     raylib.SetExitKey(.KEY_NULL);
 
     font := raylib.LoadFont("../c_editor/Mx437_ToshibaSat_8x16.ttf");
+    state.font = font;
     menu_bar_state := ui.MenuBarState{
         items = []ui.MenuBarItem {
             ui.MenuBarItem {
@@ -124,13 +127,13 @@ main :: proc() {
     };
 
     for !raylib.WindowShouldClose() && !state.should_close {
-        screen_width := raylib.GetScreenWidth();
+        state.screen_width = raylib.GetScreenWidth();
-        screen_height := raylib.GetScreenHeight();
+        state.screen_height = raylib.GetScreenHeight();
         mouse_pos := raylib.GetMousePosition();
 
         buffer := &state.buffers[state.current_buffer];
 
-        buffer.glyph_buffer_height = math.min(256, int((screen_height - 32 - core.source_font_height) / core.source_font_height));
+        buffer.glyph_buffer_height = math.min(256, int((state.screen_height - 32 - core.source_font_height) / core.source_font_height));
 
         {
             raylib.BeginDrawing();
@@ -138,28 +141,31 @@ main :: proc() {
 
             raylib.ClearBackground(theme.get_palette_raylib_color(.Background));
             core.draw_file_buffer(&state, buffer, 32, core.source_font_height, font);
-            ui.draw_menu_bar(&menu_bar_state, 0, 0, screen_width, screen_height, font, core.source_font_height);
+            ui.draw_menu_bar(&menu_bar_state, 0, 0, state.screen_width, state.screen_height, font, core.source_font_height);
 
-            raylib.DrawRectangle(0, screen_height - core.source_font_height, screen_width, core.source_font_height, theme.get_palette_raylib_color(.Background2));
+            raylib.DrawRectangle(0, state.screen_height - core.source_font_height, state.screen_width, core.source_font_height, theme.get_palette_raylib_color(.Background2));
 
             line_info_text := raylib.TextFormat("Line: %d, Col: %d --- Slice Index: %d, Content Index: %d", buffer.cursor.line + 1, buffer.cursor.col + 1, buffer.cursor.index.slice_index, buffer.cursor.index.content_index);
             line_info_width := raylib.MeasureTextEx(font, line_info_text, core.source_font_height, 0).x;
 
             switch state.mode {
                 case .Normal:
-                    raylib.DrawRectangle(0, screen_height - core.source_font_height, 8 + len("NORMAL")*core.source_font_width, core.source_font_height, theme.get_palette_raylib_color(.Foreground4));
+                    raylib.DrawRectangle(0, state.screen_height - core.source_font_height, 8 + len("NORMAL")*core.source_font_width, core.source_font_height, theme.get_palette_raylib_color(.Foreground4));
-                    raylib.DrawRectangleV(raylib.Vector2 { f32(screen_width) - line_info_width - 8 , f32(screen_height - core.source_font_height) }, raylib.Vector2 { 8 + line_info_width, f32(core.source_font_height) }, theme.get_palette_raylib_color(.Foreground4));
+                    raylib.DrawRectangleV(raylib.Vector2 { f32(state.screen_width) - line_info_width - 8 , f32(state.screen_height - core.source_font_height) }, raylib.Vector2 { 8 + line_info_width, f32(core.source_font_height) }, theme.get_palette_raylib_color(.Foreground4));
 
-                    raylib.DrawTextEx(font, "NORMAL", raylib.Vector2 { 4, f32(screen_height - core.source_font_height) }, core.source_font_height, 0, theme.get_palette_raylib_color(.Background1));
+                    raylib.DrawTextEx(font, "NORMAL", raylib.Vector2 { 4, f32(state.screen_height - core.source_font_height) }, core.source_font_height, 0, theme.get_palette_raylib_color(.Background1));
                 case .Insert:
-                    raylib.DrawRectangle(0, screen_height - core.source_font_height, 8 + len("INSERT")*core.source_font_width, core.source_font_height, raylib.SKYBLUE);
+                    raylib.DrawRectangle(0, state.screen_height - core.source_font_height, 8 + len("INSERT")*core.source_font_width, core.source_font_height, theme.get_palette_raylib_color(.Foreground2));
-                    raylib.DrawRectangleV(raylib.Vector2 { f32(screen_width) - line_info_width - 8 , f32(screen_height - core.source_font_height) }, raylib.Vector2 { 8 + line_info_width, f32(core.source_font_height) }, raylib.SKYBLUE);
+                    raylib.DrawRectangleV(raylib.Vector2 { f32(state.screen_width) - line_info_width - 8 , f32(state.screen_height - core.source_font_height) }, raylib.Vector2 { 8 + line_info_width, f32(core.source_font_height) }, theme.get_palette_raylib_color(.Foreground2));
 
-                    raylib.DrawTextEx(font, "INSERT", raylib.Vector2 { 4, f32(screen_height - core.source_font_height) }, core.source_font_height, 0, raylib.DARKBLUE);
+                    raylib.DrawTextEx(font, "INSERT", raylib.Vector2 { 4, f32(state.screen_height - core.source_font_height) }, core.source_font_height, 0, theme.get_palette_raylib_color(.Background1));
             }
 
+            raylib.DrawTextEx(font, line_info_text, raylib.Vector2 { f32(state.screen_width) - line_info_width - 4, f32(state.screen_height - core.source_font_height) }, core.source_font_height, 0, theme.get_palette_raylib_color(.Background1));
 
-            raylib.DrawTextEx(font, line_info_text, raylib.Vector2 { f32(screen_width) - line_info_width - 4, f32(screen_height - core.source_font_height) }, core.source_font_height, 0, theme.get_palette_raylib_color(.Background1));
+            if state.buffer_list_window_is_visible {
+                ui.draw_buffer_list_window(&state);
+            }
         }
 
         switch state.mode {

src/ui/floating_window.odin

@@ -0,0 +1,52 @@
+package ui;
+
+import "core:math"
+import "vendor:raylib"
+
+import "../core"
+import "../theme"
+
+draw_buffer_list_window :: proc(state: ^core.State) {
+    win_rec := raylib.Rectangle {
+        x = f32(state.screen_width/8),
+        y = f32(state.screen_height/8),
+        width = f32(state.screen_width - state.screen_width/4),
+        height = f32(state.screen_height - state.screen_height/4),
+    };
+    raylib.DrawRectangleRec(
+        win_rec,
+        theme.get_palette_raylib_color(.Background4));
+
+    win_margin := raylib.Vector2 { f32(text_padding*2), f32(core.source_font_height) };
+
+    buffer_prev_width := (win_rec.width - win_margin.x*2) / 2;
+    buffer_prev_height := win_rec.height - win_margin.y*2;
+
+    glyph_buffer_width := int(buffer_prev_width) / core.source_font_width - 1;
+    glyph_buffer_height := int(buffer_prev_height) / core.source_font_height;
+
+    raylib.DrawRectangle(
+        i32(win_rec.x + win_rec.width / 2),
+        i32(win_rec.y + win_margin.y),
+        i32(buffer_prev_width),
+        i32(buffer_prev_height),
+        theme.get_palette_raylib_color(.Background2));
+
+    for _, index in state.buffers {
+        buffer := &state.buffers[index];
+
+        raylib.DrawTextEx(
+            state.font,
+            raylib.TextFormat("%s:%d", buffer.file_path, buffer.cursor.line+1),
+            raylib.Vector2 { win_rec.x + win_margin.x, win_rec.y + win_margin.y + f32(index * core.source_font_height) },
+            core.source_font_height,
+            0,
+            theme.get_palette_raylib_color(.Foreground2));
+
+        if index == state.buffer_list_window_selected_buffer {
+            buffer.glyph_buffer_height = glyph_buffer_height;
+            buffer.glyph_buffer_width = glyph_buffer_width;
+            core.draw_file_buffer(state, buffer, int(win_rec.x + win_margin.x + win_rec.width / 2), int(win_rec.y + win_margin.y), state.font, show_line_numbers = false);
+        }
+    }
+}