added slider, mouse capture in Node, desaturated icons

engine/layout.h

@@ -51,6 +51,7 @@ enum class kWidget : uint16_t
     Icon      = const_hash("icon"),
     Button    = const_hash("button"),
     ButtonCustom = const_hash("button-custom"),
+    SliderCursor = const_hash("slider-cursor"),
     PopupMenu = const_hash("popup-menu"),
     Viewport  = const_hash("viewport"),
     Ref       = const_hash("ref"),
@@ -126,6 +127,8 @@ public:
     uint16_t m_nodeID;
     std::string m_nodeID_s;
     std::vector<std::unique_ptr<Node>> m_children;
+    Node* current_mouse_capture = nullptr;
+    bool m_mouse_captured = false;
 
     glm::mat4 m_proj;
     glm::mat4 m_mvp;
@@ -204,6 +207,11 @@ public:
     void SetPositioning(YGPositionType value) { YGNodeStyleSetPositionType(y_node, value); }
     void SetAspectRatio(float ar) { YGNodeStyleSetAspectRatio(y_node, ar); }
 
+    glm::vec2 GetPosition() { return{ YGNodeLayoutGetLeft(y_node), YGNodeLayoutGetTop(y_node) }; }
+    float GetWidth() { return YGNodeLayoutGetWidth(y_node); }
+    float GetHeight() { return YGNodeLayoutGetHeight(y_node); }
+    glm::vec2 GetSize() { return { GetWidth(), GetHeight() }; }
+
     glm::vec4 rect_intersection(glm::vec4 a, glm::vec4 b)
     {
         // convert from [x,y,w,h] to [x1,y1,x2,y1]
@@ -257,6 +265,8 @@ public:
     virtual void loaded() { }
     void add_child(Node* n);
     void remove_child(Node* n);
+    void mouse_capture() { root()->current_mouse_capture = this; m_mouse_captured = true; }
+    void mouse_release() { root()->current_mouse_capture = nullptr;  m_mouse_captured = false; }
 
 //     class iterator
 //     {
@@ -876,3 +886,47 @@ public:
         return kEventResult::Consumed;
     }
 };
+
+class NodeSliderCursor : public NodeButtonCustom
+{
+public:
+    glm::vec2 drag_start;
+    glm::vec2 drag_diff;
+    bool dragging = false;
+    glm::vec2 old_pos;
+    virtual Node* clone_instantiate() const override { return new NodeSliderCursor(); }
+    virtual void clone_copy(Node* dest) const override
+    {
+        NodeButtonCustom::clone_copy(dest);
+        NodeSliderCursor* n = static_cast<NodeSliderCursor*>(dest);
+    }
+    virtual kEventResult handle_event(Event* e) override
+    {
+        NodeBorder::handle_event(e);
+        switch (e->m_type)
+        {
+        case kEventType::MouseDownL:
+            drag_start = ((MouseEvent*)e)->m_pos;
+            dragging = true;
+            mouse_capture();
+            break;
+        case kEventType::MouseUpL:
+            mouse_release();
+            dragging = false;
+            break;
+        case kEventType::MouseMove:
+            if (dragging)
+            {
+                float pw = parent->GetWidth();
+                float w = GetWidth();
+                drag_diff = ((MouseEvent*)e)->m_pos - drag_start;
+                float x = glm::clamp<float>(drag_diff.x, 0, pw - w);
+                SetPosition(x, 0);
+            }
+            break;
+        default:
+            break;
+        }
+        return kEventResult::Consumed;
+    }
+};