Discern between virtual and abstract class bindings

* Previous "virtual" classes (which can't be instantiated) are not corretly named "abstract".
* Added a new "virtual" category for classes, they can't be instantiated from the editor, but can be inherited from script and extensions.
* Converted a large amount of classes from "abstract" to "virtual" where it makes sense.

Most classes that make sense have been converted. Missing:

* Physics servers
* VideoStream
* Script* classes.

which will go in a separate PR due to the complexity involved.

1 files changed, 33 insertions, 0 deletions

diff --git a/scene/resources/style_box.cpp b/scene/resources/style_box.cpp
index 5afd424e03..fe52761482 100644
--- a/scene/resources/style_box.cpp
+++ b/scene/resources/style_box.cpp
@@ -34,10 +34,28 @@
 
 #include <limits.h>
 
+float StyleBox::get_style_margin(Side p_side) const {
+	float ret;
+	if (GDVIRTUAL_REQUIRED_CALL(_get_style_margin, p_side, ret)) {
+		return ret;
+	}
+	return 0;
+}
 bool StyleBox::test_mask(const Point2 &p_point, const Rect2 &p_rect) const {
+	bool ret;
+	if (GDVIRTUAL_CALL(_test_mask, p_point, p_rect, ret)) {
+		return ret;
+	}
+
 	return true;
 }
 
+void StyleBox::draw(RID p_canvas_item, const Rect2 &p_rect) const {
+	if (GDVIRTUAL_REQUIRED_CALL(_draw, p_canvas_item, p_rect)) {
+		return;
+	}
+}
+
 void StyleBox::set_default_margin(Side p_side, float p_value) {
 	ERR_FAIL_INDEX((int)p_side, 4);
 
@@ -74,10 +92,19 @@ Point2 StyleBox::get_offset() const {
 }
 
 Size2 StyleBox::get_center_size() const {
+	Size2 ret;
+	if (GDVIRTUAL_CALL(_get_center_size, ret)) {
+		return ret;
+	}
+
 	return Size2();
 }
 
 Rect2 StyleBox::get_draw_rect(const Rect2 &p_rect) const {
+	Rect2 ret;
+	if (GDVIRTUAL_CALL(_get_draw_rect, p_rect, ret)) {
+		return ret;
+	}
 	return p_rect;
 }
 
@@ -100,6 +127,12 @@ void StyleBox::_bind_methods() {
 	ADD_PROPERTYI(PropertyInfo(Variant::FLOAT, "content_margin_right", PROPERTY_HINT_RANGE, "-1,2048,1"), "set_default_margin", "get_default_margin", SIDE_RIGHT);
 	ADD_PROPERTYI(PropertyInfo(Variant::FLOAT, "content_margin_top", PROPERTY_HINT_RANGE, "-1,2048,1"), "set_default_margin", "get_default_margin", SIDE_TOP);
 	ADD_PROPERTYI(PropertyInfo(Variant::FLOAT, "content_margin_bottom", PROPERTY_HINT_RANGE, "-1,2048,1"), "set_default_margin", "get_default_margin", SIDE_BOTTOM);
+
+	GDVIRTUAL_BIND(_get_style_margin, "side")
+	GDVIRTUAL_BIND(_test_mask, "point", "rect")
+	GDVIRTUAL_BIND(_get_center_size)
+	GDVIRTUAL_BIND(_get_draw_rect, "rect")
+	GDVIRTUAL_BIND(_draw, "to_canvas_item", "rect")
 }
 
 StyleBox::StyleBox() {