refactor layout loading to add multiple layout, templates and references

data/layout.xml

@@ -1,5 +1,8 @@
 <?xml version="1.0"?>
-<layout>
+<layout id="button">
+  
+</layout>
+<layout id="main">
   <node dir="col" wrap="0" width="100%" height="100%" pad="5">
     <!-- toolbar -->
     <border height="50" width="100%" pad="5" dir="row" color=".2">
@@ -34,8 +37,8 @@
       </plane>
       <!-- content panel -->
       <plane width="1" grow="1" height="100%" pad="30" wrap="1">
-        <border thickness="5" border-color="1" color=".4" height="100%">
-          <shape type="round-rect" width="100%" height="100%"></shape>
+        <border thickness="5" border-color="1" color=".4" height="100%" pad="10">
+          <shape type="round-rect" border-color=".5" thickness="4" width="100%" height="100%"></shape>
         </border>
       </plane>
     </plane>

engine/app.cpp

@@ -75,7 +75,7 @@ void App::init()
 #endif
     
     layout.load("data/layout.xml");
-    layout.update(width, height);
+    //layout.update(width, height);
 
     sampler.create();
     ShaderManager::create(kShader::Texture, shader_v, shader_f);
@@ -123,16 +123,16 @@ void App::update(float dt)
 
     glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
     glEnable(GL_SCISSOR_TEST);
-    for (auto& n : layout)
-    {
-
-        if (n.m_widget)
-        {
-            auto box = n.m_widget->clip;
-            glScissor(box.x, height - box.y - box.w, box.z, box.w);
-            n.m_widget->draw();
-        }
-    }
+//     for (auto& n : layout)
+//     {
+// 
+//         if (n.m_widget)
+//         {
+//             auto box = n.m_widget->clip;
+//             glScissor(box.x, height - box.y - box.w, box.z, box.w);
+//             n.m_widget->draw();
+//         }
+//     }
     glDisable(GL_SCISSOR_TEST); 
     tex.unbind();
     sampler.unbind();
@@ -142,7 +142,7 @@ void App::resize(float w, float h)
 {
     width = w;
     height = h;
-    layout.update(width, height);
+//    layout.update(width, height);
 }
 
 void App::mouse_down(int button, float x, float y)

engine/app.h

@@ -9,7 +9,7 @@ class App
 {
     Sampler sampler;
     Texture2D tex;
-    Node layout;
+    LayoutManager layout;
 public:
     static App I;
     float width;

engine/layout.cpp

@@ -21,7 +21,26 @@ void Node::update_internal(const glm::vec2& origin, const glm::mat4& proj)
     float h = YGNodeLayoutGetHeight(y_node);
     m_pos = origin + glm::vec2(x, y);
     m_size = glm::vec2(w, h);
-    m_clip = !parent ? glm::vec4(m_pos, m_size) : rect_intersection(glm::vec4(m_pos, m_size), parent->m_clip);
+
+    if (parent)
+    {
+        // correct the padding clip
+        // should not clip the padded area
+        // useful to draw decorations
+        float pt = YGNodeLayoutGetPadding(parent->y_node, YGEdgeTop);
+        float pr = YGNodeLayoutGetPadding(parent->y_node, YGEdgeRight);
+        float pb = YGNodeLayoutGetPadding(parent->y_node, YGEdgeBottom);
+        float pl = YGNodeLayoutGetPadding(parent->y_node, YGEdgeLeft);
+        glm::vec2 off_p(pl, pt);
+        glm::vec2 off_s(pr, pb);
+        m_clip = glm::vec4(m_pos - off_p, m_size + off_p + off_s);
+        m_clip = rect_intersection(m_clip, parent->m_clip);
+    }
+    else
+    {
+        m_clip = glm::vec4(m_pos, m_size);
+    }
+    
     if (m_widget)
     {
         glm::mat4 pivot = glm::translate(glm::vec3(.5f, .5f, 0.f));
@@ -151,26 +170,6 @@ void Node::parse_attributes(kAttribute ka, const tinyxml2::XMLAttribute* attr)
     }
 }
 
-void Node::load(const char* path)
-{
-    struct stat tmp_info;
-    if (stat(path, &tmp_info) != 0)
-        return;
-    if (tmp_info.st_mtime <= m_file_info.st_mtime)
-        return;
-    m_file_info = tmp_info;
-    m_path = path;
-
-    m_children.clear();
-    YGNodeReset(y_node);
-
-    tinyxml2::XMLDocument xml;
-    auto ret = xml.LoadFile(path);
-    if (ret != tinyxml2::XMLError::XML_SUCCESS)
-        return;
-    load_internal(xml.RootElement());
-}
-
 void Node::load_internal(const tinyxml2::XMLElement* x_node)
 {
     m_name = x_node->Name();
@@ -209,12 +208,53 @@ void Node::load_internal(const tinyxml2::XMLElement* x_node)
     }
 }
 
-void Node::reload()
+bool LayoutManager::load(const char* path)
 {
-    float w = YGNodeLayoutGetWidth(y_node);
-    float h = YGNodeLayoutGetHeight(y_node);
-    // avoid conflict when assigning the same string from c_str
-    std::string path_copy = m_path; 
-    load(path_copy.c_str());
-    update(w, h);
+    struct stat tmp_info;
+    if (stat(path, &tmp_info) != 0)
+        return false;
+    if (tmp_info.st_mtime <= m_file_info.st_mtime)
+        return false;
+    m_file_info = tmp_info;
+    m_path = path;
+
+    m_layouts.clear();
+
+    tinyxml2::XMLDocument xml;
+    auto ret = xml.LoadFile(path);
+    if (ret != tinyxml2::XMLError::XML_SUCCESS)
+        return false;
+
+    tinyxml2::XMLElement* current = xml.RootElement();
+    while (current)
+    {
+        auto id_str = current->Attribute("id");
+        if (!id_str)
+        {
+            printf("Layout node without id\n");
+            return false;
+        }
+        uint16_t id = const_hash(id_str);
+        auto p = m_layouts.try_emplace(id);
+        if (p.second)
+        {
+            auto& node = p.first->second;
+            node.load_internal(current);
+        }
+        else
+        {
+            printf("Layout id \"%s\" duplicated\n", id_str);
+        }
+        current = current->NextSiblingElement("layout");
+    }
+}
+
+void LayoutManager::reload()
+{
+//     float w = YGNodeLayoutGetWidth(y_node);
+//     float h = YGNodeLayoutGetHeight(y_node);
+//     // avoid conflict when assigning the same string from c_str
+//     std::string path_copy = m_path; 
+//     load(path_copy.c_str());
+//     update(w, h);
 }

engine/layout.h

@@ -39,7 +39,6 @@ enum class kShapeType : uint16_t
     Poly        = const_hash("poly"),
     RoundRect   = const_hash("round-rect"),
     Slice9      = const_hash("slice9"),
-
 };
 
 class Widget
@@ -185,8 +184,6 @@ class Node
 {
     const Node* parent{ nullptr };
     YGNodeRef y_node{ nullptr };
-    struct stat m_file_info { 0 };
-    std::string m_path;
 
 public:
     std::vector<Node> m_children;
@@ -201,7 +198,6 @@ public:
     Node(Node&& o)
     {
         m_name = std::move(o.m_name);
-        m_path = std::move(o.m_path);
         m_widget = std::move(o.m_widget);
         m_children = std::move(o.m_children);
         for (auto& c : m_children)
@@ -211,7 +207,6 @@ public:
         m_pos = o.m_pos;
         m_size = o.m_size;
         m_clip = o.m_clip;
-        m_file_info = o.m_file_info;
         o.y_node = nullptr;
         o.parent = nullptr;
     }
@@ -254,9 +249,7 @@ public:
     void update(float width, float height);
     void update_internal(const glm::vec2& origin, const glm::mat4& proj);
     void parse_attributes(kAttribute ka, const tinyxml2::XMLAttribute* attr);
-    void load(const char* path);
     void load_internal(const tinyxml2::XMLElement* x_node);
-    void reload();
     void draw();
 
     class iterator
@@ -292,3 +285,13 @@ public:
         return nullptr;
     }
 };
+
+class LayoutManager
+{
+    std::map<uint16_t, Node> m_layouts;
+    std::string m_path;
+    struct stat m_file_info { 0 };
+public:
+    bool load(const char* path);
+    void reload();
+};