[Add] Multi-line rendering in TextView.

client/src/terminal.cpp

@@ -46,6 +46,7 @@ bool Terminal::close(void) { return _should_close; }
 
 void Terminal::_on_ret_press(void) {
   std::string command = _input_buffer.get_line(0);
+  _input_buffer.newline(); /* Add newline to buffer for histroy. */
   _input_buffer.clear();
 
   /* Add the command to history. */

client/src/ui/text_view.cpp

@@ -4,7 +4,7 @@
 #include "gfx/types.h"
 #include "ui/text_buffer.h"
 
-TextView::TextView(TextBuffer* buffer) : _buffer(buffer) {}
+TextView::TextView(TextBuffer* buffer) : _buffer(buffer), _scroll_offset(0) {}
 
 TextView::~TextView(void) {}
 
@@ -19,7 +19,11 @@ bool TextView::handle_event(SDL_Event* event) {
         _buffer->backspace();
         break;
       case SDLK_RETURN:
-        /* Instead of adding newline, signal that input was submitted. */
+        /*
+         * For editor, we want a real newline.
+         * For terminal, we just want to submit. No newline.
+         * We'll return true and let the parent component do the do'ing.
+         */
         return true;
         break;
       case SDLK_LEFT:
@@ -47,20 +51,35 @@ bool TextView::handle_event(SDL_Event* event) {
   return false;
 }
 
+void TextView::scroll(int amount, int content_height) {
+  _scroll_offset += amount;
+
+  if(_scroll_offset < 0) {
+    _scroll_offset = 0;
+  }
+  float line_height = 20.0f;
+  int visible_lines = content_height / line_height;
+  int max_scroll = _buffer->get_line_count() - visible_lines;
+  if(max_scroll < 0) max_scroll = 0;
+  if(_scroll_offset > max_scroll) {
+    _scroll_offset = max_scroll;
+  }
+}
+
 void TextView::render(TextRenderer* renderer, int x, int y, bool show_cursor) {
   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;
 
-  /*
-   * Just render first line (for term input) for now.
-   * The code editor would need to iterate through _buffer->get_line_count()
-   */
-  std::string line = _buffer->get_line(0);
   Point cursor_pos = _buffer->get_cursor_pos();
+  float current_y = y;
 
-  if(show_cursor) {
+  for(size_t i = _scroll_offset; i < _buffer->get_line_count(); ++i) {
+    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.
@@ -72,6 +91,7 @@ void TextView::render(TextRenderer* renderer, int x, int y, bool show_cursor) {
         line.insert(cursor_pos.col, 1, '_');
       }
     }
-
-  renderer->render_text(line.c_str(), x, y, 1.0f, text_color);
+    renderer->render_text(line.c_str(), x, current_y, 1.0f, text_color);
+    current_y -= line_height;
+  }
 }

client/src/ui/text_view.h

@@ -13,7 +13,9 @@ public:
 
   bool handle_event(SDL_Event* event);
   void render(TextRenderer* renderer, int x, int y, bool show_cursor);
+  void scroll(int amount, int content_height);
 
 private:
   TextBuffer* _buffer;
+  int _scroll_offset;
 };