From d3c4c4cd02fcdd54b8fb87af0297f4887b35701d Mon Sep 17 00:00:00 2001
From: Krzosa Karol <krzosa.karol@gmail.com>
Date: Tue, 2 Jul 2024 08:56:29 +0200
Subject: [PATCH] Add line number drawing

---
 src/text_editor/main.cpp | 27 +++++++++++++++++++++++----
 1 file changed, 23 insertions(+), 4 deletions(-)

diff --git a/src/text_editor/main.cpp b/src/text_editor/main.cpp
index 34d0f2f..aa998c7 100644
--- a/src/text_editor/main.cpp
+++ b/src/text_editor/main.cpp
@@ -75,7 +75,7 @@ int main() {
     InitArena(&PermArena);
     float font_size    = 64;
     float font_spacing = 1;
-    Font  font         = LoadFontEx("C:/Windows/Fonts/times.ttf", (int)font_size, NULL, 250);
+    Font  font         = LoadFontEx("C:/Windows/Fonts/consola.ttf", (int)font_size, NULL, 250);
 
     Array<Window> windows = {};
     {
@@ -419,12 +419,13 @@ int main() {
 
         ForItem(window, windows) {
             // Draw and layout window overlay
-            Vec2 mouse = GetMousePosition();
+            Vec2  mouse            = GetMousePosition();
+            Rect2 line_number_rect = {};
             {
                 window.rect               = window.start_rect;
                 Rect2 horizontal_bar_rect = CutBottom(&window.rect, 10);
                 Rect2 vertical_bar_rect   = CutRight(&window.rect, 10);
-                Rect2 line_numbers        = CutLeft(&window.rect, 50);
+                line_number_rect          = CutLeft(&window.rect, MeasureString(window.font, "1234", window.font_size, window.font_spacing).x);
 
                 DrawRectangleRec(ToRectangle(window.rect), WHITE);
 
@@ -489,7 +490,9 @@ int main() {
 
             // Mouse selection
             if (!window.mouse_selecting_hori_bar && !window.mouse_selecting_vert_bar) {
-                bool mouse_in_window = CheckCollisionPointRec(mouse, ToRectangle(window.rect));
+                bool mouse_in_window = CheckCollisionPointRec(mouse, ToRectangle(window.rect)) ||
+                                       CheckCollisionPointRec(mouse, ToRectangle(line_number_rect));
+                // @todo: fix scrolling bug when selecting on left outside the frame!!
                 if (!window.mouse_selecting && mouse_in_window) {
                     SetMouseCursor(MOUSE_CURSOR_IBEAM);
                 }
@@ -648,6 +651,22 @@ int main() {
             }
 
             EndScissorMode();
+
+            // Draw line numbers
+            {
+                Rect2 rect = line_number_rect;
+                BeginScissorMode((int)rect.min.x, (int)rect.min.y, (int)(rect.max.x - rect.min.x), (int)(rect.max.y - rect.min.y));
+                for (int64_t line = visible_line_range.min; line < visible_line_range.max; line += 1) {
+                    if (line < 0 || line >= window.layout.rows.len) continue;
+                    LayoutRow &row = window.layout.rows[line];
+
+                    Vec2 pos = {rect.min.x, row.rect.min.y + rect.min.y - window.scroll.y};
+
+                    String line_num_string = Format(FrameArena, "%lld", (long long)line);
+                    DrawTextEx(font, line_num_string.data, pos, font_size, font_spacing, LIGHTGRAY);
+                }
+                EndScissorMode();
+            }
         }
 
         Dbg_Draw();