BansheeEngine/SBansheeEngine/Include/BsScriptGUIElement.h

#pragma once

#include "BsScriptEnginePrerequisites.h"
#include "BsScriptObject.h"
#include "BsGUIOptions.h"
#include "BsGUIElementBase.h"

namespace BansheeEngine
{
	/**
	 * @brief	Interop class between C++ & CLR for all elements inheriting from
	 *			GUIElementBase.
	 */
	class BS_SCR_BE_EXPORT ScriptGUIElementBaseTBase : public ScriptObjectBase
	{
	public:
		ScriptGUIElementBaseTBase(MonoObject* instance);
		virtual ~ScriptGUIElementBaseTBase() {}

		/**
		 * @brief	Returns the underlying GUIElementBase wrapped by this object.
		 */
		GUIElementBase* getGUIElement() const { return (GUIElementBase*)mElement; }

		/**
		 * @brief	Destroys the underlying GUIElementBase.
		 */
		virtual void destroy() = 0;

		/**
		 * @brief	Checks have we destroyed the underlying GUIElementBase.
		 */
		bool isDestroyed() const { return mIsDestroyed; }

		/**
		 * @brief	Returns the parent interop object for a GUI layout or a GUI panel.
		 */
		ScriptGUILayout* getParent() const { return mParent; }

		/**
		 * @brief	Sets an interop object for a GUI layout or a panel as this object's parent.
		 */
		void setParent(ScriptGUILayout* parent) { mParent = parent; }

	protected:
		/**
		 * @brief	Initializes the interop object with a previously initialized GUI
		 *			element. You must call this before using this object.
		 */
		void initialize(GUIElementBase* element);

		/**
		 * @copydoc	ScriptObjectBase::_onManagedInstanceDeleted
		 */
		virtual void _onManagedInstanceDeleted() override;

		/**
		 * @brief	Triggered when the focus changes for the underlying GUIElementBase.
		 */
		static void onFocusChanged(MonoObject* instance, bool focus);

		bool mIsDestroyed;
		GUIElementBase* mElement;
		ScriptGUILayout* mParent;
	};

	/**
	 * @brief	A more specialized implementation of ScriptGUIElementBaseTBase that
	 *			references a specific GUI element type instead of the generic GUIElementBase.
	 */
	template <class Type>
	class TScriptGUIElementBase : public ScriptObject<Type, ScriptGUIElementBaseTBase>
	{
	public:
		virtual ~TScriptGUIElementBase() {}

	protected:
		TScriptGUIElementBase(MonoObject* instance, GUIElementBase* element)
			:ScriptObject(instance)
		{ 
			initialize(element);
		}

		/**
		 * @copydoc	ScriptObjectBase::_onManagedInstanceDeleted
		 */
		void _onManagedInstanceDeleted()
		{
			// Elements with a GUIWidget parent are destroyed automatically when widget is destroyed, but those without one
			// we need to destroy manually.
			if (getGUIElement()->_getParentWidget() == nullptr) 
				destroy();

			ScriptObject::_onManagedInstanceDeleted();
		}
	};

	/**
	 * @brief	Interop class between C++ & CLR for all elements inheriting from
	 *			GUIElement.
	 */
	class BS_SCR_BE_EXPORT ScriptGUIElementTBase : public ScriptGUIElementBaseTBase
	{
	public:
		ScriptGUIElementTBase(MonoObject* instance);
		virtual ~ScriptGUIElementTBase() {}

		/**
		 * @copydoc	ScriptGUIElementBaseTBase::destroy
		 */
		virtual void destroy() override;
	};

	/**
	 * @brief	A more specialized implementation of ScriptGUIElementTBase that
	 *			references a specific GUI element type instead of the generic GUIElement.
	 */
	template <class Type>
	class TScriptGUIElement : public ScriptObject<Type, ScriptGUIElementTBase>
	{
	public:
		virtual ~TScriptGUIElement() {}

	protected:
		TScriptGUIElement(MonoObject* instance, GUIElementBase* element)
			:ScriptObject(instance)
		{
			initialize(element);
		}

		/**
		 * @copydoc	ScriptObjectBase::_onManagedInstanceDeleted
		 */
		void _onManagedInstanceDeleted()
		{
			// Elements with a GUIWidget parent are destroyed automatically when widget is destroyed, but those without one
			// we need to destroy manually.
			if (!mIsDestroyed && getGUIElement()->_getParentWidget() == nullptr)
				destroy();

			ScriptObject::_onManagedInstanceDeleted();
		}
	};

	/**
	 * @brief	Interop class between C++ & CLR for GUIElement. This includes only base
	 *			methods belonging directly to GUIElement while specific GUI element 
	 *			implementations have their own interop classes.
	 */
	class BS_SCR_BE_EXPORT ScriptGUIElement : public ScriptObject<ScriptGUIElement>
	{
	public:
		SCRIPT_OBJ(ENGINE_ASSEMBLY, "BansheeEngine", "GUIElement")

		typedef void(__stdcall *OnFocusChangedThunkDef) (MonoObject*, bool, MonoException**);

		static OnFocusChangedThunkDef onFocusChangedThunk;

	private:
		ScriptGUIElement(MonoObject* instance);

		/************************************************************************/
		/* 								CLR HOOKS						   		*/
		/************************************************************************/
		static void internal_destroy(ScriptGUIElementBaseTBase* nativeInstance);
		static void internal_setVisible(ScriptGUIElementBaseTBase* nativeInstance, bool visible);
		static void internal_setFocus(ScriptGUIElementBaseTBase* nativeInstance, bool focus);
		static Rect2I internal_getBounds(ScriptGUIElementBaseTBase* nativeInstance);
		static void internal_setBounds(ScriptGUIElementBaseTBase* nativeInstance, Rect2I bounds);
		static Rect2I internal_getVisibleBounds(ScriptGUIElementBaseTBase* nativeInstance);
		static void internal_SetPosition(ScriptGUIElementBaseTBase* nativeInstance, INT32 x, INT32 y);
		static void internal_SetWidth(ScriptGUIElementBaseTBase* nativeInstance, UINT32 width);
		static void internal_SetFlexibleWidth(ScriptGUIElementBaseTBase* nativeInstance, UINT32 minWidth, UINT32 maxWidth);
		static void internal_SetHeight(ScriptGUIElementBaseTBase* nativeInstance, UINT32 height);
		static void internal_SetFlexibleHeight(ScriptGUIElementBaseTBase* nativeInstance, UINT32 minHeight, UINT32 maxHeight);
		static void internal_SetContextMenu(ScriptGUIElementBaseTBase* nativeInstance, ScriptContextMenu* contextMenu);
		static void internal_ResetDimensions(ScriptGUIElementBaseTBase* nativeInstance);
	};
}