refactor layout.h into single file per Node* classes

engine/node_button_custom.cpp

@@ -0,0 +1,73 @@
+#include "pch.h"
+#include "log.h"
+#include "node_button_custom.h"
+
+Node* NodeButtonCustom::clone_instantiate() const
+{
+    return new NodeButtonCustom();
+}
+
+void NodeButtonCustom::clone_copy(Node* dest) const
+{
+    NodeBorder::clone_copy(dest);
+    NodeButtonCustom* n = static_cast<NodeButtonCustom*>(dest);
+    n->color_normal = color_normal;
+    n->color_hover = color_hover;
+    n->color_down = color_down;
+    n->m_mouse_ignore = false;
+    n->m_color = color_normal;
+}
+
+void NodeButtonCustom::loaded()
+{
+    NodeBorder::loaded();
+    //m_thinkness = 1;
+    //m_border_color = glm::vec4(0, 0, 0, 1);
+    m_color = color_normal;
+    m_mouse_ignore = false;
+}
+
+void NodeButtonCustom::set_color(const glm::vec4& c)
+{
+    color_normal = c;
+    m_color = color_normal;
+}
+
+kEventResult NodeButtonCustom::handle_event(Event* e)
+{
+    NodeBorder::handle_event(e);
+    switch (e->m_type)
+    {
+    case kEventType::MouseEnter:
+        m_color = color_hover;
+        break;
+    case kEventType::MouseLeave:
+        m_color = color_normal;
+        break;
+    case kEventType::MouseDownL:
+        m_color = color_down;
+        break;
+    case kEventType::MouseUpL:
+        m_color = m_mouse_inside ? color_hover : color_normal;
+        if (m_mouse_inside && on_click != nullptr)
+            on_click(this);
+        break;
+    default:
+        return kEventResult::Available;
+        break;
+    }
+    return kEventResult::Consumed;
+}
+
+void NodeButtonCustom::parse_attributes(kAttribute ka, const tinyxml2::XMLAttribute* attr)
+{
+    NodeBorder::parse_attributes(ka, attr);
+    switch (ka)
+    {
+    case kAttribute::Color:
+        color_normal = m_color;
+        break;
+    default:
+        break;
+    }
+}