From 1353ed5e44a725308292ce44d24d7cf76b0af272 Mon Sep 17 00:00:00 2001
From: Paulb23 <p_batty@hotmail.co.uk>
Date: Sat, 25 Jul 2020 18:27:35 +0100
Subject: Added Line numbers to CodeEdit

---
 scene/gui/code_edit.cpp | 86 ++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 85 insertions(+), 1 deletion(-)

(limited to 'scene/gui/code_edit.cpp')

diff --git a/scene/gui/code_edit.cpp b/scene/gui/code_edit.cpp
index 05572e71c9..3d4f8222c4 100644
--- a/scene/gui/code_edit.cpp
+++ b/scene/gui/code_edit.cpp
@@ -32,15 +32,99 @@
 
 void CodeEdit::_notification(int p_what) {
 	switch (p_what) {
+		case NOTIFICATION_THEME_CHANGED:
+		case NOTIFICATION_ENTER_TREE: {
+			set_gutter_width(line_number_gutter, (line_number_digits + 1) * cache.font->get_char_size('0').width);
+
+			line_number_color = get_theme_color("line_number_color");
+		} break;
 		case NOTIFICATION_DRAW: {
-		}
+		} break;
 	}
 }
 
+/* Line numbers */
+void CodeEdit::set_draw_line_numbers(bool p_draw) {
+	set_gutter_draw(line_number_gutter, p_draw);
+}
+
+bool CodeEdit::is_draw_line_numbers_enabled() const {
+	return is_gutter_drawn(line_number_gutter);
+}
+
+void CodeEdit::set_line_numbers_zero_padded(bool p_zero_padded) {
+	p_zero_padded ? line_number_padding = "0" : line_number_padding = " ";
+	update();
+}
+
+bool CodeEdit::is_line_numbers_zero_padded() const {
+	return line_number_padding == "0";
+}
+
+void CodeEdit::_line_number_draw_callback(int p_line, int p_gutter, const Rect2 &p_region) {
+	String fc = String::num(p_line + 1).lpad(line_number_digits, line_number_padding);
+
+	int yofs = region.position.y + (cache.row_height - cache.font->get_height()) / 2;
+	cache.font->draw(get_canvas_item(), Point2(region.position.x, yofs + cache.font->get_ascent()), fc, line_number_color);
+}
+
 void CodeEdit::_bind_methods() {
+	/* Line numbers */
+	ClassDB::bind_method(D_METHOD("_line_number_draw_callback"), &CodeEdit::_line_number_draw_callback);
+
+	ClassDB::bind_method(D_METHOD("set_draw_line_numbers", "enable"), &CodeEdit::set_draw_line_numbers);
+	ClassDB::bind_method(D_METHOD("is_draw_line_numbers_enabled"), &CodeEdit::is_draw_line_numbers_enabled);
+	ClassDB::bind_method(D_METHOD("set_line_numbers_zero_padded", "enable"), &CodeEdit::set_line_numbers_zero_padded);
+	ClassDB::bind_method(D_METHOD("is_line_numbers_zero_padded"), &CodeEdit::is_line_numbers_zero_padded);
+
+	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "draw_line_numbers"), "set_draw_line_numbers", "is_draw_line_numbers_enabled");
+	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "zero_pad_line_numbers"), "set_line_numbers_zero_padded", "is_line_numbers_zero_padded");
+}
+
+void CodeEdit::_gutter_clicked(int p_line, int p_gutter) {
+	if (p_gutter == line_number_gutter) {
+		cursor_set_line(p_line);
+		return;
+	}
+}
+
+void CodeEdit::_line_edited_from(int p_line) {
+	int line_count = get_line_count();
+	if (line_count != cached_line_count) {
+		int lc = line_count;
+		line_number_digits = 1;
+		while (lc /= 10) {
+			line_number_digits++;
+		}
+		set_gutter_width(line_number_gutter, (line_number_digits + 1) * cache.font->get_char_size('0').width);
+
+		cached_line_count = line_count;
+	}
+}
+
+void CodeEdit::_update_gutter_indexes() {
+	for (int i = 0; i < get_gutter_count(); i++) {
+		if (get_gutter_name(i) == "line_numbers") {
+			line_number_gutter = i;
+			continue;
+		}
+	}
 }
 
 CodeEdit::CodeEdit() {
+	/* Line numbers */
+	add_gutter();
+	set_gutter_name(0, "line_numbers");
+	set_gutter_draw(0, false);
+	set_gutter_type(0, GUTTER_TPYE_CUSTOM);
+	set_gutter_custom_draw(0, this, "_line_number_draw_callback");
+
+	connect("line_edited_from", callable_mp(this, &CodeEdit::_line_edited_from));
+	connect("gutter_clicked", callable_mp(this, &CodeEdit::_gutter_clicked));
+
+	connect("gutter_added", callable_mp(this, &CodeEdit::_update_gutter_indexes));
+	connect("gutter_removed", callable_mp(this, &CodeEdit::_update_gutter_indexes));
+	_update_gutter_indexes();
 }
 
 CodeEdit::~CodeEdit() {
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