diff --git a/ArchitectureColoredPainting/ArchitectureColoredPainting.vcxproj b/ArchitectureColoredPainting/ArchitectureColoredPainting.vcxproj
index 1c52dfd..6aaae03 100644
--- a/ArchitectureColoredPainting/ArchitectureColoredPainting.vcxproj
+++ b/ArchitectureColoredPainting/ArchitectureColoredPainting.vcxproj
@@ -99,7 +99,10 @@
   <ItemGroup>
     <ClCompile Include="src\CaptionButton.cpp" />
     <ClCompile Include="src\Editor\EditorWidget.cpp" />
+    <ClCompile Include="src\Editor\ElementManager.cpp" />
     <ClCompile Include="src\Editor\GraphicElement.cpp" />
+    <ClCompile Include="src\Editor\LayerManager.cpp" />
+    <ClCompile Include="src\Editor\LayerWrapper.cpp" />
     <ClCompile Include="src\IconWidget.cpp" />
     <ClCompile Include="src\main.cpp" />
     <ClCompile Include="src\MainWindow.cpp" />
@@ -151,7 +154,11 @@
   </ItemGroup>
   <ItemGroup>
     <QtMoc Include="src\MainWindow.h" />
+    <ClInclude Include="src\Editor\ElementManager.h" />
     <ClInclude Include="src\Editor\GraphicElement.h" />
+    <ClInclude Include="src\Editor\LayerManager.h" />
+    <ClInclude Include="src\Editor\LayerStyle.h" />
+    <ClInclude Include="src\Editor\LayerWrapper.h" />
     <ClInclude Include="src\Renderer\Painting\Element.h" />
     <ClInclude Include="src\Renderer\Painting\Painting.h" />
     <ClInclude Include="src\SvgParser.h" />
diff --git a/ArchitectureColoredPainting/ArchitectureColoredPainting.vcxproj.filters b/ArchitectureColoredPainting/ArchitectureColoredPainting.vcxproj.filters
index b73c477..1d9364f 100644
--- a/ArchitectureColoredPainting/ArchitectureColoredPainting.vcxproj.filters
+++ b/ArchitectureColoredPainting/ArchitectureColoredPainting.vcxproj.filters
@@ -129,6 +129,15 @@
     <ClCompile Include="src\Editor\GraphicElement.cpp">
       <Filter>Source Files\Editor</Filter>
     </ClCompile>
+    <ClCompile Include="src\Editor\ElementManager.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="src\Editor\LayerManager.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="src\Editor\LayerWrapper.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <QtMoc Include="src\Renderer\RendererGLWidget.h">
@@ -272,6 +281,18 @@
     <ClInclude Include="src\Editor\GraphicElement.h">
       <Filter>Header Files\Editor</Filter>
     </ClInclude>
+    <ClInclude Include="src\Editor\ElementManager.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="src\Editor\LayerManager.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="src\Editor\LayerStyle.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="src\Editor\LayerWrapper.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <QtRcc Include="MainWindow.qrc">
diff --git a/ArchitectureColoredPainting/src/Editor/ElementManager.cpp b/ArchitectureColoredPainting/src/Editor/ElementManager.cpp
new file mode 100644
index 0000000..af7cbde
--- /dev/null
+++ b/ArchitectureColoredPainting/src/Editor/ElementManager.cpp
@@ -0,0 +1,15 @@
+#include "ElementManager.h"
+ElementManager *ElementManager::getInstance()
+{
+    return nullptr;
+}
+void ElementManager::addElement(GraphicElement *element)
+{
+}
+void ElementManager::removeElement(GraphicElement *pElement)
+{
+}
+GraphicElement *ElementManager::getElementById(int index)
+{
+    return nullptr;
+}
diff --git a/ArchitectureColoredPainting/src/Editor/ElementManager.h b/ArchitectureColoredPainting/src/Editor/ElementManager.h
new file mode 100644
index 0000000..0397576
--- /dev/null
+++ b/ArchitectureColoredPainting/src/Editor/ElementManager.h
@@ -0,0 +1,19 @@
+#pragma once
+#include "GraphicElement.h"
+#include <vector>
+using std::vector;
+class ElementManager
+{
+  private:
+    static ElementManager *INSTANCE;
+    vector<GraphicElement> mElements;
+
+  public:
+    static ElementManager *getInstance();
+    void addElement(GraphicElement *element);
+    void removeElement(GraphicElement *pElement);
+    /**
+     *  only used in initialization
+     */
+    GraphicElement *getElementById(int index);
+};
diff --git a/ArchitectureColoredPainting/src/Editor/LayerManager.cpp b/ArchitectureColoredPainting/src/Editor/LayerManager.cpp
new file mode 100644
index 0000000..8c36f08
--- /dev/null
+++ b/ArchitectureColoredPainting/src/Editor/LayerManager.cpp
@@ -0,0 +1,5 @@
+#include "LayerManager.h"
+
+void LayerManager::paint(QPainter *painter) const
+{
+}
diff --git a/ArchitectureColoredPainting/src/Editor/LayerManager.h b/ArchitectureColoredPainting/src/Editor/LayerManager.h
new file mode 100644
index 0000000..02653a8
--- /dev/null
+++ b/ArchitectureColoredPainting/src/Editor/LayerManager.h
@@ -0,0 +1,18 @@
+#pragma once
+#include "LayerWrapper.h"
+#include <QPainter>
+#include <utility>
+#include <vector>
+using std::pair;
+using std::vector;
+class LayerManager
+{
+  private:
+    using LayerPtrs = vector<LayerWrapper *>;
+    LayerWrapper root;
+    LayerPtrs selectedLayers;
+    LayerPtrs involvedLeafLayersCache;
+
+  public:
+    void paint(QPainter *painter) const;
+};
diff --git a/ArchitectureColoredPainting/src/Editor/LayerStyle.h b/ArchitectureColoredPainting/src/Editor/LayerStyle.h
new file mode 100644
index 0000000..d3966ab
--- /dev/null
+++ b/ArchitectureColoredPainting/src/Editor/LayerStyle.h
@@ -0,0 +1,6 @@
+#pragma once
+class LayerStyle
+{
+  public:
+    virtual void apply() = 0;
+};
diff --git a/ArchitectureColoredPainting/src/Editor/LayerWrapper.cpp b/ArchitectureColoredPainting/src/Editor/LayerWrapper.cpp
new file mode 100644
index 0000000..6f5dcb1
--- /dev/null
+++ b/ArchitectureColoredPainting/src/Editor/LayerWrapper.cpp
@@ -0,0 +1,11 @@
+#include "LayerWrapper.h"
+
+void LayerWrapper::applyStyles(SimpleElement &element)
+{
+}
+void FolderLayerWrapper::addChild(LayerWrapper *child)
+{
+}
+void FolderLayerWrapper::removeChild(LayerWrapper *child)
+{
+}
diff --git a/ArchitectureColoredPainting/src/Editor/LayerWrapper.h b/ArchitectureColoredPainting/src/Editor/LayerWrapper.h
new file mode 100644
index 0000000..426f88f
--- /dev/null
+++ b/ArchitectureColoredPainting/src/Editor/LayerWrapper.h
@@ -0,0 +1,37 @@
+#pragma once
+#include "GraphicElement.h"
+#include "LayerStyle.h"
+#include <QLine>
+#include <QPoint>
+#include <memory>
+#include <vector>
+using std::shared_ptr;
+using std::vector;
+class LayerWrapper
+{
+  protected:
+    shared_ptr<LayerWrapper> parent;
+    QPointF referencePoint;
+    vector<LayerStyle> styles;
+    QPainterPath cache;
+
+  public:
+    void applyStyles(SimpleElement &element); // invoke by manager, then invoke parent's applyStyles
+    // todo: provide atomic operations for Events
+};
+
+class FolderLayerWrapper : public LayerWrapper
+{
+  private:
+    vector<shared_ptr<LayerWrapper>> children;
+
+  public:
+    void addChild(LayerWrapper *child);
+    void removeChild(LayerWrapper *child);
+};
+
+class LeafLayerWrapper : public LayerWrapper
+{
+  private:
+    shared_ptr<SimpleElement> wrappedElement;
+};