[Add] Line numbers to the editor.

client/src/terminal.cpp

@@ -13,7 +13,7 @@
 Terminal::Terminal(GameState* game_state)
     : _game_state(game_state), _should_close(false), _scroll_offset(0),
       _prompt(""), _pending_action({ActionType::NONE}) {
-  _input_view = std::make_unique<TextView>(&_input_buffer, false);
+  _input_view = std::make_unique<TextView>(&_input_buffer, false, false);
 }
 
 Terminal::~Terminal(void) {}
@@ -141,11 +141,16 @@ void Terminal::render(const RenderContext& context, int x, int y_screen, int y_g
   /* Render text view for the input right after prompt. */
   float input_x_pos = x + padding + (prompt_str.length() * 8.5f); /* Estimate width */
   float input_width = width - (input_x_pos-x);
-  _input_view->render(context.ui_renderer, input_x_pos, prompt_line_y, input_width, 
-                      line_height, context.show_cursor);
+  _input_view->render_text_content(context.ui_renderer, input_x_pos, prompt_line_y, input_width, line_height);
 
   context.ui_renderer->flush_text();
 
   /* Disable scissor test. */
   glDisable(GL_SCISSOR_TEST);
+
+  if(context.show_cursor) {
+    context.ui_renderer->begin_shapes();
+    _input_view->render_cursor(context.ui_renderer, input_x_pos, prompt_line_y, input_width, line_height);
+    context.ui_renderer->flush_shapes();
+  }
 }

client/src/ui/editor.cpp

@@ -6,7 +6,7 @@
 Editor::Editor(void)
     : _should_close(false), _pending_action({ActionType::NONE}),
       _filename("untitled.txt") {
-  _view = std::make_unique<TextView>(&_buffer, true);
+  _view = std::make_unique<TextView>(&_buffer, true, true);
   _menu_bar = std::make_unique<MenuBar>(25);
   _menu_bar->add_menu("File");
   _menu_bar->add_menu_item("File", "Save", [this]() {
@@ -17,7 +17,7 @@ Editor::Editor(void)
 Editor::Editor(const std::string& filename)
     : _should_close(false), _pending_action({ActionType::NONE}),
       _filename(filename) {
-  _view = std::make_unique<TextView>(&_buffer, true);
+  _view = std::make_unique<TextView>(&_buffer, true, true);
   _menu_bar = std::make_unique<MenuBar>(25);
   _menu_bar->add_menu("File");
   _menu_bar->add_menu_item("File", "Save", [this]() {
@@ -58,15 +58,20 @@ void Editor::render(const RenderContext& context, int x, int y_screen, int y_gl,
   context.ui_renderer->flush_shapes();
 
   /* Pass 2: Main text view. */
-  _view->render(context.ui_renderer, x, content_y, width, content_height, context.show_cursor);
-
-  /* Pass 3: Menu bar text and dropdown. */
   context.ui_renderer->begin_text();
-  _menu_bar->render_bar_text(context.ui_renderer, x, y_screen, width);
+  _view->render_text_content(context.ui_renderer, x, content_y, width, content_height);
   context.ui_renderer->flush_text();
 
-  /* Pass 4: Dropdown menu. */
+  /* Pass 3: Editor cursor. */
+  if(context.show_cursor) {
+    context.ui_renderer->begin_shapes();
+    _view->render_cursor(context.ui_renderer, x, content_y, width, content_height);
+    context.ui_renderer->flush_shapes();
+  }
+
+  /* Pass 4: Menu bar text and dropdown. */
   context.ui_renderer->begin_text();
+  _menu_bar->render_bar_text(context.ui_renderer, x, y_screen, width);
   _menu_bar->render_dropdown(context.ui_renderer, x, y_screen, width);
   context.ui_renderer->flush_text();
 }

client/src/ui/text_view.cpp

@@ -1,11 +1,16 @@
 #include <SDL3/SDL_events.h>
+#include <string>
+
 #include "text_view.h"
-#include "gfx/txt_renderer.h"
 #include "gfx/types.h"
 #include "ui/text_buffer.h"
+#include "ui/ui_renderer.h"
 
-TextView::TextView(TextBuffer* buffer, bool handle_ret) : _buffer(buffer),
-    _scroll_offset(0), _handle_ret(handle_ret) {}
+TextView::TextView(TextBuffer* buffer, bool handle_ret, bool show_line_numbers) :
+      _buffer(buffer),
+      _scroll_offset(0),
+      _handle_ret(handle_ret),
+      _show_line_numbers(show_line_numbers) {}
 
 TextView::~TextView(void) {}
 
@@ -70,15 +75,16 @@ void TextView::scroll(int amount, int content_height) {
   }
 }
 
-void TextView::render(UIRenderer* ui_renderer, int x, int y, int width, int height,
-                      bool show_cursor) {
+void TextView::render_text_content(UIRenderer* ui_renderer, int x, int y, int width, int height) {
   if(!_buffer) return;
 
-  const Color text_color = { 1.0f, 1.0f, 1.0f };
-  float line_height = 20.0f; /* TODO: Get font metrics? */
-  float padding = 5.0f;
+  const Color text_color      = { 1.0f, 1.0f, 1.0f };
+  const Color line_num_color  = { 0.5f, 0.6f, 0.7f };
+
+  const float line_height   = 20.0f; /* TODO: Get font metrics? */
+  const float padding       = 5.0f;
+  const float gutter_width  = _show_line_numbers ? 40.0f : 0.0f;
 
-  Point cursor_pos = _buffer->get_cursor_pos();
   float current_y = y;
 
   for(size_t i = _scroll_offset; i < _buffer->get_line_count(); ++i) {
@@ -90,22 +96,34 @@ void TextView::render(UIRenderer* ui_renderer, int x, int y, int width, int heig
       break;
     }
 
-    std::string line = _buffer->get_line(i);
-
-    if(show_cursor && (int)i == cursor_pos.row) {
-      /*
-      * This hacky. we should calculate the text width
-      * up to the cursor pos to draw correctly.
-      * For now, just append an underscore.
-      */
-      if(cursor_pos.col == line.length()) {
-        line += "_";
-      } else {
-        line.insert(cursor_pos.col, 1, '_');
-      }
+    if(_show_line_numbers) {
+      /* Render line number. */
+      std::string line_num_str = std::to_string(i+1);
+      float line_num_text_width =
+        ui_renderer->get_text_renderer()->get_text_width(line_num_str.c_str(), 1.0f);
+      ui_renderer->render_text(line_num_str.c_str(), x+padding+(gutter_width-line_num_text_width-10),
+                              current_y+18, line_num_color);
     }
-    /* Add 18 to get baseline from top of the line. */
-    ui_renderer->render_text(line.c_str(), x+padding, current_y + 18, text_color);
+
+    /* Render line content. */
+    std::string line = _buffer->get_line(i);
+    ui_renderer->render_text(line.c_str(), x+padding+gutter_width, current_y+18, text_color);
     current_y += line_height;
   }
 }
+
+void TextView::render_cursor(UIRenderer* ui_renderer, int x, int y, int width, int height) {
+  const Color text_color    = { 1.0f, 1.0f, 1.0f };
+  const float line_height   = 20.0f; /* TODO: Get font metrics? */
+  const float padding       = 5.0f;
+  const float gutter_width  = _show_line_numbers ? 40.0f : 0.0f;
+  Point cursor_pos = _buffer->get_cursor_pos();
+  std::string line_before_cursor = _buffer->get_line(cursor_pos.row).substr(0, cursor_pos.col);
+  float text_width =
+  ui_renderer->get_text_renderer()->get_text_width(line_before_cursor.c_str(), 1.0f);
+  float cursor_x = x + padding + gutter_width + text_width;
+  float cursor_y = y + (cursor_pos.row - _scroll_offset) * line_height;
+  if(cursor_y >= y && cursor_y < y + height) {
+    ui_renderer->draw_rect(cursor_x, cursor_y, 2, line_height, text_color);
+  }
+}

client/src/ui/text_view.h

@@ -9,16 +9,17 @@ class TextRenderer;
 
 class TextView {
 public:
-  TextView(TextBuffer* buffer, bool handle_ret);
+  TextView(TextBuffer* buffer, bool handle_ret, bool show_line_numbers);
   ~TextView(void);
 
   bool handle_event(SDL_Event* event);
-  void render(UIRenderer* ui_renderer, int x, int y, int width, int height,
-              bool show_cursor);
   void scroll(int amount, int content_height);
+  void render_text_content(UIRenderer* ui_renderer, int x, int y, int width, int height);
+  void render_cursor(UIRenderer* ui_renderer, int x, int y, int width, int height);
 
 private:
   TextBuffer* _buffer;
   int _scroll_offset;
   bool _handle_ret;
+  bool _show_line_numbers;
 };