Sdk/Widget: Add Canvas system, mouse movement event for widgets (buttons react to hovering)

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SDK/include/NDK/Canvas.hpp

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+// Copyright (C) 2015 Jérôme Leclercq
+// This file is part of the "Nazara Development Kit"
+// For conditions of distribution and use, see copyright notice in Prerequesites.hpp
+
+#pragma once
+
+#ifndef NDK_CANVAS_HPP
+#define NDK_CANVAS_HPP
+
+#include <NDK/Prerequesites.hpp>
+#include <NDK/BaseWidget.hpp>
+#include <Nazara/Utility/EventHandler.hpp>
+
+namespace Ndk
+{
+	class NDK_API Canvas : public BaseWidget
+	{
+		friend BaseWidget;
+
+		public:
+			struct Padding;
+
+			inline Canvas(WorldHandle world, Nz::EventHandler& eventHandler);
+			Canvas(const Canvas&) = delete;
+			Canvas(Canvas&&) = delete;
+			~Canvas() = default;
+
+			inline const WorldHandle& GetWorld() const;
+
+			void ResizeToContent() override;
+
+			Canvas& operator=(const Canvas&) = delete;
+			Canvas& operator=(Canvas&&) = delete;
+
+		protected:
+			void Layout() override;
+
+			void NotifyWidgetUpdate(std::size_t index);
+			std::size_t RegisterWidget(BaseWidget* widget);
+			void UnregisterWidget(std::size_t index);
+
+		private:
+			void OnMouseMoved(const Nz::EventHandler* eventHandler, const Nz::WindowEvent::MouseMoveEvent& event);
+		
+			struct WidgetBox
+			{
+				BaseWidget* widget;
+				Nz::Boxf box;
+			};
+
+			NazaraSlot(Nz::EventHandler, OnMouseMoved, m_mouseMovedSlot);
+
+			std::vector<WidgetBox> m_widgetBoxes;
+			BaseWidget* m_hoveredWidget;
+			WorldHandle m_world;
+	};
+}
+
+#include <NDK/Canvas.inl>
+
+#endif // NDK_CANVAS_HPP