/*
 * This file is subject to the terms of the GFX License. If a copy of
 * the license was not distributed with this file, you can obtain one at:
 *
 *              http://ugfx.io/license.html
 */

/*
 * @file    src/gwin/gwin_class.h
 * @brief   GWIN Graphic window subsystem header file.
 *
 * @defgroup Internal Internal
 * @ingroup GWIN
 *
 * @note	These definitions are normally not used by an application program. They are useful
 * 			only if you want to create your own custom GWIN window or widget.
 * @note	To access these definitions you must include "src/gwin/gwin_class.h" in your source file.
 *
 * @{
 */
#ifndef _CLASS_GWIN_H
#define _CLASS_GWIN_H

#if GFX_USE_GWIN || defined(__DOXYGEN__)

/**
 * @brief	The predefined flags for a Window
 * @{
 */
#define GWIN_FIRST_CONTROL_FLAG			0x00000001			/**< 8 bits free for the control to use. Don't change this value as it is relied upon definitions in widget header files. */
#define GWIN_LAST_CONTROL_FLAG			0x00000080			/**< 8 bits free for the control to use */
#define GWIN_FLG_VISIBLE				0x00000100			/**< The window is "visible" */
#define GWIN_FLG_SYSVISIBLE				0x00000200			/**< The window is visible after parents are tested */
#define GWIN_FLG_ENABLED				0x00000400			/**< The window is "enabled" */
#define GWIN_FLG_SYSENABLED				0x00000800			/**< The window is enabled after parents are tested */
#define GWIN_FLG_DYNAMIC				0x00001000			/**< The GWIN structure is allocated */
#define GWIN_FLG_ALLOCTXT				0x00002000			/**< The text/label is allocated */
#define GWIN_FLG_NEEDREDRAW				0x00004000			/**< Redraw is needed but has been delayed */
#define GWIN_FLG_BGREDRAW				0x00008000			/**< On redraw, if not visible redraw the revealed under-side */
#define GWIN_FLG_SUPERMASK				0x000F0000			/**< The bit mask to leave just the window superclass type */
#define GWIN_FLG_WIDGET					0x00010000			/**< This is a widget */
#define GWIN_FLG_CONTAINER				0x00020000			/**< This is a container */
#define GWIN_FLG_MINIMIZED				0x00100000			/**< The window is minimized */
#define GWIN_FLG_MAXIMIZED				0x00200000			/**< The window is maximized */
#define GWIN_FLG_MOUSECAPTURE			0x00400000			/**< The window has captured the mouse */
#define GWIN_FLG_FLASHING				0x00800000			/**< The window is flashing - see the _gwinFlashState boolean */
#define GWIN_FIRST_WM_FLAG				0x01000000			/**< 8 bits free for the window manager to use */
#define GWIN_LAST_WM_FLAG				0x80000000			/**< 8 bits free for the window manager to use */
/** @} */

/**
 * @brief	The Virtual Method Table for a GWIN window
 * @{
 */
typedef struct gwinVMT {
	const char *		classname;						/**< The GWIN classname (mandatory) */
	gMemSize			size;							/**< The size of the class object */
	void (*Destroy)		(GWindowObject *gh);			/**< The GWIN destroy function (optional) */
	void (*Redraw)		(GWindowObject *gh);			/**< The GWIN redraw routine (optional) */
	void (*AfterClear)	(GWindowObject *gh);			/**< The GWIN after-clear function (optional) */
} gwinVMT;
/** @} */

#if GWIN_NEED_WIDGET || defined(__DOXYGEN__)

	/**
	 * @brief	An toggle/dial instance is not being used
	 */
	#define GWIDGET_NO_INSTANCE		((gU16)-1)

	/**
	 * @brief	The source handle that widgets use when sending events
	 */
	#define GWIDGET_SOURCE			((GSourceHandle)(void *)_gwidgetCreate)

	/**
	 * @brief	The Virtual Method Table for a widget
	 * @note	A widget must have a destroy function. Either use @p _gwidgetDestroy() or use your own function
	 * 			which internally calls @p _gwidgetDestroy().
	 * @note	A widget must have a redraw function. Use @p _gwidgetRedraw().
	 * @note	If toggleroles != 0, ToggleAssign(), ToggleGet() and one or both of ToggleOff() and ToggleOn() must be specified.
	 * @note	If dialroles != 0, DialAssign(), DialGet() and DialMove() must be specified.
	 * @{
	 */
	typedef struct gwidgetVMT {
		struct gwinVMT				g;															/**< This is still a GWIN */
		void (*DefaultDraw)			(GWidgetObject *gw, void *param);							/**< The default drawing routine (mandatory) */
		#if GINPUT_NEED_MOUSE
			struct {
				void (*MouseDown)		(GWidgetObject *gw, gCoord x, gCoord y);				/**< Process mouse down events (optional) */
				void (*MouseUp)			(GWidgetObject *gw, gCoord x, gCoord y);				/**< Process mouse up events (optional) */
				void (*MouseMove)		(GWidgetObject *gw, gCoord x, gCoord y);				/**< Process mouse move events (optional) */
			};
		#endif
		#if GINPUT_NEED_KEYBOARD || GWIN_NEED_KEYBOARD
			struct {
				void (*KeyboardEvent)	(GWidgetObject *gw, GEventKeyboard *pke);				/**< Process keyboard events (optional) */
			};
		#endif
		#if GINPUT_NEED_TOGGLE
			struct {
				gU16				toggleroles;											/**< The roles supported for toggles (0->toggleroles-1) */
				void (*ToggleAssign)	(GWidgetObject *gw, gU16 role, gU16 instance);	/**< Assign a toggle to a role (optional) */
				gU16 (*ToggleGet)	(GWidgetObject *gw, gU16 role);						/**< Return the instance for a particular role (optional) */
				void (*ToggleOff)		(GWidgetObject *gw, gU16 role);						/**< Process toggle off events (optional) */
				void (*ToggleOn)		(GWidgetObject *gw, gU16 role);						/**< Process toggle on events (optional) */
			};
		#endif
		#if GINPUT_NEED_DIAL
			struct {
				gU16				dialroles;												/**< The roles supported for dials (0->dialroles-1) */
				void (*DialAssign)		(GWidgetObject *gw, gU16 role, gU16 instance);	/**< Test the role and save the dial instance handle (optional) */
				gU16 (*DialGet)		(GWidgetObject *gw, gU16 role);						/**< Return the instance for a particular role (optional) */
				void (*DialMove)		(GWidgetObject *gw, gU16 role, gU16 value, gU16 max);	/**< Process dial move events (optional) */
			};
		#endif
	} gwidgetVMT;
	/** @} */
#endif

#if GWIN_NEED_CONTAINERS || defined(__DOXYGEN__)

	/**
	 * @brief	The Virtual Method Table for a container
	 * @note	A container must have a destroy function. Either use @p _gcontainerDestroy() or use your own function
	 * 			which internally calls @p _gcontainerDestroy().
	 * @note	A container must have a gwin redraw function. Use @p _containerRedraw().
	 * @note	If toggleroles != 0, ToggleAssign(), ToggleGet() and one or both of ToggleOff() and ToggleOn() must be specified.
	 * @note	If dialroles != 0, DialAssign(), DialGet() and DialMove() must be specified.
	 * @{
	 */
	typedef struct gcontainerVMT {
		gwidgetVMT	gw;
		gCoord (*LeftBorder)		(GHandle gh);							/**< The size of the left border (mandatory) */
		gCoord (*TopBorder)		(GHandle gh);							/**< The size of the top border (mandatory) */
		gCoord (*RightBorder)		(GHandle gh);							/**< The size of the right border (mandatory) */
		gCoord (*BottomBorder)		(GHandle gh);							/**< The size of the bottom border (mandatory) */
		void (*NotifyAdd)			(GHandle gh, GHandle ghChild);			/**< Notification that a child has been added (optional) */
		void (*NotifyDelete)		(GHandle gh, GHandle ghChild);			/**< Notification that a child has been deleted (optional) */
	} gcontainerVMT;
	/** @} */
#endif

#if GWIN_NEED_WINDOWMANAGER || defined(__DOXYGEN__)
	// @note	There is only ever one instance of each GWindowManager type
	typedef struct GWindowManager {
		const struct gwmVMT	*vmt;
	} GWindowManager;

	/**
	 * @brief	The Virtual Method Table for a window manager
	 * @{
	 */
	typedef struct gwmVMT {
		void (*Init)		(void);									/**< The window manager has just been set as the current window manager */
		void (*DeInit)		(void);									/**< The window manager has just been removed as the current window manager */
		gBool (*Add)		(GHandle gh, const GWindowInit *pInit);	/**< A window has been added */
		void (*Delete)		(GHandle gh);							/**< A window has been deleted */
		void (*Redraw)		(GHandle gh);							/**< A window needs to be redraw (or undrawn) */
		void (*Size)		(GHandle gh, gCoord w, gCoord h);		/**< A window wants to be resized */
		void (*Move)		(GHandle gh, gCoord x, gCoord y);		/**< A window wants to be moved */
		void (*Raise)		(GHandle gh);							/**< A window wants to be on top */
		void (*MinMax)		(GHandle gh, GWindowMinMax minmax);		/**< A window wants to be minimized/maximised */
	} gwmVMT;
	/** @} */

	/**
	 * @brief	The current window manager
	 */
	extern	GWindowManager	*_GWINwm;
	extern	gBool			_gwinFlashState;

#endif

/**
 * @brief	Initialise (and allocate if necessary) the base GWIN object
 *
 * @param[in]	g		The GDisplay to use for this window
 * @param[in]	pgw		The GWindowObject structure. If NULL one is allocated from the heap
 * @param[in]	pInit	The user initialization parameters
 * @param[in]	vmt		The virtual method table for the GWIN object
 * @param[in]	flags	The default flags to use
 *
 * @return	The GHandle of the created window
 *
 * @notapi
 */
GHandle _gwindowCreate(GDisplay *g, GWindowObject *pgw, const GWindowInit *pInit, const gwinVMT *vmt, gU32 flags);

/**
 * @brief	Redraw the window after a status change.
 *
 * @param[in]	gh		The widget to redraw
 *
 * @note	Mark a window for redraw.
 * @note	The window will get redrawn at some later time.
 * @note	This call is designed to be fast and non-blocking
 *
 * @notapi
 */
void _gwinUpdate(GHandle gh);

/**
 * @brief	How to flush the redraws
 * @notes	REDRAW_WAIT			- Wait for a drawing session to be available
 * @notes	REDRAW_NOWAIT		- Do nothing if the drawing session is not available
 * @note	REDRAW_INSESSION	- We are already in a drawing session
 */
typedef enum GRedrawMethod { REDRAW_WAIT, REDRAW_NOWAIT, REDRAW_INSESSION }	GRedrawMethod;

/**
 * @brief	Flush any pending redraws in the system.
 *
 * @param[in]	how		Do we wait for the lock?
 *
 * @note	This call will attempt to flush any pending redraws
 * 			in the system. The doWait parameter tells this call
 * 			how to handle someone already holding the drawing lock.
 * 			If doWait is gTrue it waits to obtain the lock. If gFalse
 * 			and the drawing lock is free then the redraw is done
 * 			immediately. If the drawing lock was taken it will postpone the flush
 * 			on the basis that someone else will do it for us later.
 *
 * @notapi
 */
void _gwinFlushRedraws(GRedrawMethod how);

/**
 * @brief	Obtain a drawing session
 * @return	gTrue if the drawing session was obtained, gFalse if the window is not visible
 *
 * @param[in]	gh		The window
 *
 * @note	This function blocks until a drawing session is available if the window is visible
 */
gBool _gwinDrawStart(GHandle gh);

/**
 * @brief	Release a drawing session
 *
 * @param[in]	gh		The window
 */
void _gwinDrawEnd(GHandle gh);

/**
 * @brief	Destroy a window.
 *
 * @param[in]	gh		The window
 * @param[in]	how		Do we wait for the lock?
 *
 * @note	If called without the drawing lock 'how' must be REDRAW_WAIT.
 * 			If called with the drawing lock 'how' must be REDRAW_INSESSION.
 *
 * @notapi
 */
void _gwinDestroy(GHandle gh, GRedrawMethod how);

/**
 * @brief	Add a window to the window manager and set its position and size
 * @return	gTrue if successful
 *
 * @param[in]	gh		The window
 * @param[in]	pInit	The window init structure
 */
gBool _gwinWMAdd(GHandle gh, const GWindowInit *pInit);

#if GWIN_NEED_WIDGET || defined(__DOXYGEN__)
	/**
	 * @brief	Initialise (and allocate if necessary) the base Widget object
	 *
	 * @param[in]	g		The GDisplay to display this window on
	 * @param[in]	pgw		The GWidgetObject structure. If NULL one is allocated from the heap
	 * @param[in]	pInit	The user initialization parameters
	 * @param[in]	vmt		The virtual method table for the Widget object
	 *
	 * @return	The GHandle of the created widget
 	 *
	 * @notapi
	 */
	GHandle _gwidgetCreate(GDisplay *g, GWidgetObject *pgw, const GWidgetInit *pInit, const gwidgetVMT *vmt);

	/**
	 * @brief	Destroy the Widget object
	 *
	 * @param[in]	gh		The widget to destroy
	 *
	 * @notapi
	 */
	void _gwidgetDestroy(GHandle gh);

	/**
	 * @brief	Redraw the Widget object (VMT method only)
	 *
	 * @param[in]	gh		The widget to redraw
	 *
	 * @note	Do not use this routine to update a widget after a status change.
	 * 			Use @p _gwinUpdate() instead. This routine should only be used in the
	 * 			VMT.
	 *
	 * @notapi
	 */
	void _gwidgetRedraw(GHandle gh);

	/**
	 * @brief	Send a standard GWIN event.
	 *
	 * @param[in]	gh		The window
	 * @param[in]	type	The event type
	 *
	 * @note		No consideration is given to recording EVENT LOST statuses.
	 *
	 * @notapi
	 */
	void _gwinSendEvent(GHandle gh, GEventType type);

	#if (GFX_USE_GINPUT && GINPUT_NEED_KEYBOARD) || GWIN_NEED_KEYBOARD || defined(__DOXYGEN__)
		/**
		 * @brief	Move the focus off the current focus window.
		 *
		 * @note	The focus can stay on the same window if there is no other focusable window
		 *
		 * @notapi
		 */
		void _gwinMoveFocus(void);

		/**
		 * @brief	Do focus fixup's after a change of state for a window.
		 * @details	If a focus window has become invisible or disabled then
		 * 			the focus must be taken away from it. If there is no focus
		 * 			window and this window is eligible then this window becomes
		 * 			the focus.
		 *
		 * @param[in]	gh		The window
		 *
		 * @note		This routine does not actually do a redraw. It assumes that surrounding code
		 * 				will because of the change of state that lead to this being called.
		 *
		 * @notapi
		 */
		void _gwinFixFocus(GHandle gh);

		/**
		 * @brief	Draw a simple focus rectangle in the default style.
		 *
		 * @param[in]	gw		The widget
		 * @param[in]	x, y	The start x, y position (relative to the window)
		 * @param[in]	cx, cy	The width & height of the rectangle
		 *
		 * @note		Assumes the widget is in a state where it can draw.
		 * @note		Nothing is drawn if the window doesn't have focus.
		 * @note		The focus rectangle may be more than one pixel thick and may
		 * 				not be a continuous line.
		 *
		 * @notapi
		 */
		void _gwidgetDrawFocusRect(GWidgetObject *gw, gCoord x, gCoord y, gCoord cx, gCoord cy);

		/**
		 * @brief	Draw a simple focus circle in the default style.
		 *
		 * @param[in]	gw		The widget
		 * @param[in]	radius	The radius of the circle
		 *
		 * @note		Assumes the widget is in a state where it can draw.
		 * @note		Nothing is drawn if the window doesn't have focus.
		 * @note		The focus circle may be more than one pixel thick.
		 *
		 * @notapi
		 */
		#if GDISP_NEED_CIRCLE
			void _gwidgetDrawFocusCircle(GWidgetObject *gx, gCoord radius);
		#endif

	#else
		#define _gwinFixFocus(gh)
		#define _gwidgetDrawFocusRect(gh,x,y,cx,cy)
		#define _gwidgetDrawFocusCircle(gh,radius)
	#endif

	#if GWIN_NEED_FLASHING || defined(__DOXYGEN__)
		/**
		 * @brief	Convert a chosen style color set pressed/enabled etc if flashing
		 * @return	The colorset - after flashing is taken into account
		 *
		 * @param[in]	gw				The widget
		 * @param[in]	pcol			The style color set that has been chosen to reflect the state of the widget
		 * @param[in]	flashOffState	Whether the off-state should be flashed as well. If false, only the
		 * 								pressed color set is flashed.
		 */
		const GColorSet *_gwinGetFlashedColor(GWidgetObject *gw, const GColorSet *pcol, gBool flashOffState);
	#endif
#else
	#define _gwinFixFocus(gh)
#endif

#if GWIN_NEED_CONTAINERS || defined(__DOXYGEN__)
	/**
	 * @brief	Initialise (and allocate if necessary) the base Container object
	 *
	 * @param[in]	g		The GDisplay to display this window on
	 * @param[in]	pgw		The GContainerObject structure. If NULL one is allocated from the heap
	 * @param[in]	pInit	The user initialization parameters
	 * @param[in]	vmt		The virtual method table for the Container object
	 *
	 * @return	The GHandle of the created widget
 	 *
	 * @notapi
	 */
	GHandle _gcontainerCreate(GDisplay *g, GContainerObject *pgw, const GWidgetInit *pInit, const gcontainerVMT *vmt);

	/**
	 * @brief	Destroy the Container object
	 *
	 * @param[in]	gh		The container to destroy
	 *
	 * @notapi
	 */
	void _gcontainerDestroy(GHandle gh);

	/**
	 * @brief	Redraw the Container object (VMT method only)
	 *
	 * @param[in]	gh		The container to redraw
	 *
	 * @note	Do not use this routine to update a container after a status change.
	 * 			Use @p _gwinUpdate() instead. This routine should only be used in the
	 * 			VMT.
	 *
	 * @notapi
	 */
	#define _gcontainerRedraw		_gwidgetRedraw

	/**
	 * @brief	The visibility of something has changed. Ripple the changes.
	 *
	 * @note	Does not actually trigger the redraw. It just marks as ready for redraw any
	 * 			visibility changes.
	 *
	 * @notapi
	 */
	void _gwinRippleVisibility(void);

#endif

#endif /* GFX_USE_GWIN */

#endif /* _CLASS_GWIN_H */