add 'onmouseenter', 'onmouseleave' ui events

src/graphics/ui/GUI.cpp

@@ -144,6 +144,28 @@ void GUI::actMouse(float delta, const CursorState& cursor) {
         }
     }
     this->hover = hover;
+    auto node = hover;
+    while (node) {
+        if (mouseOver.find(hover) != mouseOver.end()) {
+            break;   
+        }
+        mouseOver.insert(node);
+        node->setMouseOver(true);
+        auto parent = node->getParent();
+        if (parent) {
+            node = parent->shared_from_this();
+        }
+    }
+
+    for (auto it = mouseOver.begin(); it != mouseOver.end(); ) {
+        auto node = *it;
+        if (node->isInside(cursor.pos)) {
+            ++it;
+            continue;
+        }
+        node->setMouseOver(false);
+        it = mouseOver.erase(it);
+    }
 
     if (input.jclicked(Mousecode::BUTTON_1)) {
         if (pressed == nullptr && this->hover) {

src/graphics/ui/GUI.hpp

@@ -2,6 +2,7 @@
 
 #include "delegates.hpp"
 
+#include <set>
 #include <queue>
 #include <memory>
 #include <vector>
@@ -80,6 +81,7 @@ namespace gui {
         std::unique_ptr<Camera> uicamera;
         std::shared_ptr<Menu> menu;
         std::queue<runnable> postRunnables;
+        std::set<std::shared_ptr<UINode>> mouseOver;
 
         PageLoaderFunc pagesLoader;
 

src/graphics/ui/elements/UINode.cpp

@@ -52,6 +52,10 @@ void UINode::setHover(bool flag) {
         return;
     }
     hover = flag;
+    actions.notify(flag ? UIAction::MOUSE_ENTER : UIAction::MOUSE_LEAVE, gui);
+}
+
+void UINode::setMouseOver(bool flag) {
     actions.notify(flag ? UIAction::MOUSE_OVER : UIAction::MOUSE_OUT, gui);
 }
 

src/graphics/ui/elements/UINode.hpp

@@ -59,7 +59,9 @@ namespace gui {
         DEFOCUS,
         RIGHT_CLICK,
         MOUSE_OVER,
-        MOUSE_OUT
+        MOUSE_OUT,
+        MOUSE_ENTER,
+        MOUSE_LEAVE,
     };
 
     using ActionsSet = TaggedCallbacksSet<UIAction, GUI&>;
@@ -170,8 +172,11 @@ namespace gui {
         virtual void setHover(bool flag);
         bool isHover() const;
 
+        void setMouseOver(bool flag);
+
         virtual void setParent(UINode* node);
         UINode* getParent() const;
+        std::shared_ptr<UINode> getParentShared() const;
 
         /// @brief Set element color (doesn't affect inner elements).
         /// Also replaces hover color to avoid adding extra properties

src/graphics/ui/gui_xml.cpp

@@ -186,6 +186,8 @@ static void read_uinode(
     register_action(node, reader, element, "ondoubleclick", UIAction::DOUBLE_CLICK);
     register_action(node, reader, element, "onmouseover", UIAction::MOUSE_OVER);
     register_action(node, reader, element, "onmouseout", UIAction::MOUSE_OUT);
+    register_action(node, reader, element, "onmouseenter", UIAction::MOUSE_ENTER);
+    register_action(node, reader, element, "onmouseleave", UIAction::MOUSE_LEAVE);
 }
 
 static void read_container_impl(