refactor layout.h into single file per Node* classes

engine/node_color_quad.cpp

@@ -0,0 +1,85 @@
+#include "pch.h"
+#include "log.h"
+#include "node_color_quad.h"
+#include "shader.h"
+
+Node* NodeColorQuad::clone_instantiate() const
+{
+    return new NodeColorQuad();
+}
+
+void NodeColorQuad::clone_finalize(Node* dest) const
+{
+    auto n = (NodeColorQuad*)dest;
+    n->m_picker = (NodeBorder*)n->m_children[0].get();
+}
+
+void NodeColorQuad::init()
+{
+    m_picker = new NodeBorder;
+    m_picker->SetSize({ 20, 20 });
+    m_picker->SetPositioning(YGPositionTypeAbsolute);
+    m_picker->SetPosition(0, 0);
+    m_picker->m_thinkness = 1;
+    m_picker->m_color = glm::vec4(0);
+    add_child(m_picker);
+}
+
+void NodeColorQuad::set_value(float x, float y)
+{
+    auto sz = GetSize();
+    auto pos = glm::clamp(glm::vec2(x, y) * sz, { 0, 0 }, sz);
+    m_picker->SetPosition(pos.x, pos.y);
+    m_value = pos / glm::max({ 1,1 }, sz); // avoid div0
+    if (on_value_changed)
+        on_value_changed(this, m_value);
+}
+
+kEventResult NodeColorQuad::handle_event(Event* e)
+{
+    NodeBorder::handle_event(e);
+    switch (e->m_type)
+    {
+    case kEventType::MouseDownL:
+    {
+        dragging = true;
+        mouse_capture();
+        auto sz = GetSize();
+        auto pos = glm::clamp(((MouseEvent*)e)->m_pos - m_pos, { 0, 0 }, sz) - m_picker->GetSize() * .5f;
+        m_picker->SetPosition(pos.x, pos.y);
+        m_value = pos / glm::max({ 1,1 }, sz); // avoid div0
+        if (on_value_changed)
+            on_value_changed(this, m_value);
+    }
+    break;
+    case kEventType::MouseUpL:
+        mouse_release();
+        dragging = false;
+        break;
+    case kEventType::MouseMove:
+        if (dragging)
+        {
+            auto sz = GetSize();
+            auto pos = glm::clamp(((MouseEvent*)e)->m_pos - m_pos, { 0, 0 }, sz) - m_picker->GetSize() * .5f;
+            m_picker->SetPosition(pos.x, pos.y);
+            m_value = pos / glm::max({ 1,1 }, sz); // avoid div0
+            if (on_value_changed)
+                on_value_changed(this, m_value);
+        }
+        break;
+    default:
+        return kEventResult::Available;
+        break;
+    }
+    return kEventResult::Consumed;
+}
+
+void NodeColorQuad::draw()
+{
+    m_picker->m_border_color = m_value.y > .5f ? glm::vec4(1) : glm::vec4(0, 0, 0, 1);
+    using namespace ui;
+    ui::ShaderManager::use(kShader::ColorQuad);
+    ui::ShaderManager::u_mat4(kShaderUniform::MVP, m_mvp);
+    ui::ShaderManager::u_vec4(kShaderUniform::Col, m_color);
+    m_plane.draw_fill();
+}