add SpacerNode & bring back Dispatch

loader/include/Geode/cocos/base_nodes/Layout.hpp

@@ -23,7 +23,7 @@ class CCNode;
  */
 class GEODE_DLL Layout : public CCObject {
 protected:
-    CCArray* getNodesToPosition(CCNode* forNode);
+    CCArray* getNodesToPosition(CCNode* forNode) const;
 
     bool m_ignoreInvisibleChildren = false;
 
@@ -37,6 +37,11 @@ public:
      */
     virtual void apply(CCNode* on) = 0;
 
+    /**
+     * Get how much space this layout would like to take up for a given target
+     */
+    virtual CCSize getSizeHint(CCNode* on) const = 0;
+
     void ignoreInvisibleChildren(bool ignore);
     bool isIgnoreInvisibleChildren() const;
 
@@ -262,6 +267,7 @@ public:
     static AxisLayout* create(Axis axis = Axis::Row);
 
     void apply(CCNode* on) override;
+    CCSize getSizeHint(CCNode* on) const override;
 
     Axis getAxis() const;
     AxisAlignment getAxisAlignment() const;

loader/include/Geode/cocos/base_nodes/SpacerNode.hpp

@@ -0,0 +1,59 @@
+#pragma once
+
+#include "CCNode.h"
+
+NS_CC_BEGIN
+
+#pragma warning(push)
+#pragma warning(disable: 4275)
+
+/**
+ * A node for controlling spacing in Layouts. When a Layout is applied, if 
+ * space is left over, the remaining space is divided among all SpacerNodes in 
+ * the Layout. The space each node gets is the proprotion between its growth 
+ * factor and the sum of all the SpacerNodes' growth factors in the Layout
+ * @example
+ * node->addChild(SpacerNode::create(1));
+ * node->addChild(SpacerNode::create(2));
+ * node->addChild(SpacerNode::create(1));
+ * node->updateLayout();
+ * // Total SpacerNode growth sum is 1 + 2 + 1 = 4
+ * // So s1 and s3 get 1/4 of the remaining space and s2 gets 2/4
+ * @note If you want to specify a minimum width for a SpacerNode, add 
+ * AxisLayoutOptions for it and use setLength
+ */
+class GEODE_DLL SpacerNode : public CCNode {
+protected:
+    size_t m_grow;
+
+    bool init(size_t grow);
+
+public:
+    /**
+     * Create a new spacer node. When the layout is applied, 
+     * if there is space left over the remaining space is distributed among 
+     * all spacer nodes in proportion to the sum of all the spacers' grow 
+     * factors (akin to CSS flew grow)
+     * @param grow The grow factor for this node. Default is 1
+    */
+    static SpacerNode* create(size_t grow = 1);
+
+    /**
+     * Set the grow factor for this spacer node. When the layout is applied, 
+     * if there is space left over the remaining space is distributed among 
+     * all spacer nodes in proportion to the sum of all the spacers' grow 
+     * factors (akin to CSS flew grow)
+     * @param grow The new grow factor for this node. Default is 1
+     * @note Make sure to call updateLayout on the spacer's parent afterwards
+    */
+    void setGrow(size_t grow);
+
+    /**
+     * Get the grow factor for this spacer node
+     */
+    size_t getGrow() const;
+};
+
+#pragma warning(pop)
+
+NS_CC_END

loader/include/Geode/cocos/include/cocos2d.h

@@ -59,6 +59,7 @@ THE SOFTWARE.
 // base_nodes
 #include "../base_nodes/CCNode.h"
 #include "../base_nodes/CCAtlasNode.h"
+#include "../base_nodes/SpacerNode.hpp"
 
 // cocoa
 #include "../cocoa/CCAffineTransform.h"

loader/include/Geode/loader/Dispatch.hpp

@@ -9,42 +9,41 @@
 namespace geode {
     // Mod interoperability
 
-    // todo: update to new event system
+    template <class... Args>
+    class DispatchEvent : public Event {
+    protected:
+        std::string m_id;
+        std::tuple<Args...> m_args;
     
-    // template <typename... Args>
-    // class DispatchEvent : public Event {
-    //     std::string m_selector;
-    //     std::tuple<Args...> m_args;
+    public:
+        DispatchEvent(std::string const& id, Args&&... args)
+          : m_id(id), m_args(std::make_tuple(args...)) {}
         
-    // public:
-    //     DispatchEvent(std::string const& name, Args... args) :
-    //         m_selector(name), m_args(std::make_tuple(args...)) {}
-
-    //     std::string const& selector() {
-    //         return m_selector;
-    //     }
-    // };
-
-    // template <typename... Args>
-    // class DispatchHandler : public EventHandler<DispatchEvent<Args...>> {
-    //     std::string m_selector;
-    //     utils::MiniFunction<void(Args...)> m_callback;
-
-    //     DispatchHandler(std::string const& name, utils::MiniFunction<void(Args...)> callback) :
-    //         m_selector(name), m_callback(callback) {}
-
-    // public:
-    //     bool handle(DispatchEvent<Args...>* ev) {
-    //         if (ev->name() == m_selector) {
-    //             std::apply(m_callback, ev->m_args);
-    //         }
-    //         return true;
-    //     }
-
-    //     static DispatchHandler* create(
-    //         std::string const& name, utils::MiniFunction<void(Args...)> callback
-    //     ) {
-    //         return new DispatchHandler(name, callback);
-    //     }
-    // };
+        std::tuple<Args...> getArgs() const {
+            return m_args;
+        }
+
+        std::string getID() const {
+            return m_id;
+        }
+    };
+
+    template <class... Args>
+    class DispatchFilter : public EventFilter<DispatchEvent<Args...>> {
+    protected:
+        std::string m_id;
+
+    public:
+        using Ev = DispatchEvent<Args...>;
+        using Callback = ListenerResult(Args...);
+
+        ListenerResult handle(utils::MiniFunction<Callback> fn, Ev* event) {
+            if (event->getID() == m_id) {
+                return std::apply(fn, event->getArgs());
+            }
+            return ListenerResult::Propagate;
+        }
+
+        DispatchFilter(std::string const& id) : m_id(id) {}
+    };
 }

loader/src/cocos2d-ext/Layout.cpp

@@ -50,7 +50,7 @@ bool CCNode::hasAncestor(CCNode* ancestor) {
     return false;
 }
 
-CCArray* Layout::getNodesToPosition(CCNode* on) {
+CCArray* Layout::getNodesToPosition(CCNode* on) const {
     auto arr = CCArray::create();
     for (auto child : CCArrayExt<CCNode>(on->getChildren())) {
         if (!m_ignoreInvisibleChildren || child->isVisible()) {
@@ -176,6 +176,32 @@ struct AxisLayout::Row : public CCObject {
     {
         this->autorelease();
     }
+
+    void accountSpacers(Axis axis, float availableLength) {
+        std::vector<SpacerNode*> spacers;
+        for (auto& node : CCArrayExt<CCNode>(nodes)) {
+            if (auto spacer = typeinfo_cast<SpacerNode*>(node)) {
+                spacers.push_back(spacer);
+            }
+        }
+        if (spacers.size()) {
+            auto unusedSpace = availableLength - this->axisLength;
+            size_t sum = 0;
+            for (auto& spacer : spacers) {
+                sum += spacer->getGrow();
+            }
+            for (auto& spacer : spacers) {
+                auto size = unusedSpace * spacer->getGrow() / static_cast<float>(sum);
+                if (axis == Axis::Row) {
+                    spacer->setContentSize({ size, this->crossLength });
+                }
+                else {
+                    spacer->setContentSize({ this->crossLength, size });
+                }
+            }
+            this->axisLength = availableLength;
+        }
+    }
 };
 
 struct AxisPosition {
@@ -195,6 +221,9 @@ static AxisPosition nodeAxis(CCNode* node, Axis axis, float scale) {
     if (auto toggle = typeinfo_cast<CCMenuItemToggler*>(node)) {
         scaledSize = toggle->m_offButton->getScaledContentSize();
     }
+    if (auto spacer = typeinfo_cast<SpacerNode*>(node)) {
+        scaledSize = CCSizeZero;
+    }
     auto anchor = node->getAnchorPoint();
     if (axis == Axis::Row) {
         return AxisPosition {
@@ -611,6 +640,8 @@ void AxisLayout::tryFitLayout(
     float rowEvenSpace = available.crossLength / rows->count();
 
     for (auto row : CCArrayExt<Row*>(rows)) {
+        row->accountSpacers(m_axis, available.axisLength);
+
         if (m_crossAlignment == AxisAlignment::Even) {
             rowCrossPos -= rowEvenSpace / 2 + row->crossLength / 2;
         }
@@ -756,6 +787,24 @@ void AxisLayout::apply(CCNode* on) {
     );
 }
 
+CCSize AxisLayout::getSizeHint(CCNode* on) const {
+    // Ideal is single row / column with no scaling
+    auto nodes = getNodesToPosition(on);
+    float length = 0.f;
+    float cross = 0.f;
+    for (auto& node : CCArrayExt<CCNode*>(nodes)) {
+        auto axis = nodeAxis(node, m_axis, 1.f);
+        length += axis.axisLength;
+        cross += axis.crossLength;
+    }
+    if (m_axis == Axis::Row) {
+        return { length, cross };
+    }
+    else {
+        return { cross, length };
+    }
+}
+
 AxisLayout::AxisLayout(Axis axis) : m_axis(axis) {}
 
 Axis AxisLayout::getAxis() const {
@@ -969,3 +1018,30 @@ AxisLayoutOptions* AxisLayoutOptions::setScalePriority(int priority) {
     m_scalePriority = priority;
     return this;
 }
+
+bool SpacerNode::init(size_t grow) {
+    if (!CCNode::init())
+        return false;
+    
+    m_grow = grow;
+
+    return true;
+}
+
+SpacerNode* SpacerNode::create(size_t grow) {
+    auto ret = new SpacerNode;
+    if (ret && ret->init(grow)) {
+        ret->autorelease();
+        return ret;
+    }
+    CC_SAFE_DELETE(ret);
+    return nullptr;
+}
+
+void SpacerNode::setGrow(size_t grow) {
+    m_grow = grow;
+}
+
+size_t SpacerNode::getGrow() const {
+    return m_grow;
+}