/*************************************************************************/
/** Copyright.															**/
/** FileName: SGUI_ItemsBase.c											**/
/** Author: XuYulin														**/
/** Version: 1.0.0.0													**/
/** Description: Simple GUI items base interface, used to extend list	**/
/**				components .											**/
/*************************************************************************/

//=======================================================================//
//= Include files.													    =//
//=======================================================================//
#include "SGUI_ItemsBase.h"

//=======================================================================//
//= User Macro definition.											    =//
//=======================================================================//
#define		ITEM_EDGE_WIDTH						(1)
#define		ITEM_HEIGHT(FONT)					((FONT)->iHeight+(ITEM_EDGE_WIDTH*2))

//=======================================================================//
//= Static function declaration.									    =//
//=======================================================================//

//=======================================================================//
//= Function define.										            =//
//=======================================================================//
/*************************************************************************/
/** Function Name:	SGUI_ItemsBase_Initialize							**/
/** Purpose:		Initialize a items-base object data.				**/
/** Params:																**/
/** @ pstObj[in]:	Pointer of items-base object will be initialized.	**/
/** @ pstFontRes[in]: Font resource object pointer.						**/
/** Return:			None.												**/
/*************************************************************************/
void SGUI_ItemsBase_Initialize(SGUI_ITEMS_BASE* pstObj, const SGUI_FONT_RES* pstFontRes)
{
	/*----------------------------------*/
	/* Process							*/
	/*----------------------------------*/
	if((NULL != pstObj) && (NULL != pstFontRes))
	{
		pstObj->pstFontRes = pstFontRes;
		pstObj->iSelection = 0;
		pstObj->iVisibleItems = (pstObj->stLayout.iHeight-1)/ITEM_HEIGHT(pstObj->pstFontRes)+1;
		pstObj->iPageStartIndex = 0;
		pstObj->iPageEndIndex = 0;
		pstObj->iItemPaintOffset = 0;
	}
}

void SGUI_ItemsBase_BintItemsData(SGUI_ITEMS_BASE* pstObj, SGUI_ITEMS_ITEM* pstItemsData, SGUI_INT iItemsCount)
{
	/*----------------------------------*/
	/* Process							*/
	/*----------------------------------*/
	if((NULL != pstObj) && (NULL != pstItemsData) && (iItemsCount > 0))
	{
		pstObj->iSelection = 0;
		pstObj->iVisibleItems = (pstObj->stLayout.iHeight-1)/ITEM_HEIGHT(pstObj->pstFontRes)+1;
		pstObj->iPageStartIndex = 0;
		pstObj->iPageEndIndex = pstObj->iVisibleItems - 1;
		pstObj->pstItems = pstItemsData;
		pstObj->iCount = iItemsCount;
	}
}

void SGUI_ItemsBase_Repaint(SGUI_SCR_DEV* pstDeviceIF, SGUI_ITEMS_BASE* pstObj)
{
	/*----------------------------------*/
	/* Variable Declaration				*/
	/*----------------------------------*/
	SGUI_RECT_AREA				stItemPaintArea;
	SGUI_POINT					stItemTextPos;
	SGUI_INT					iItemIndex;
	SGUI_CSZSTR					cszItemText;

	/*----------------------------------*/
	/* Initialize						*/
	/*----------------------------------*/
	stItemTextPos.iPosX =		1;

	/*----------------------------------*/
	/* Process							*/
	/*----------------------------------*/
	if((NULL != pstDeviceIF) && (NULL != pstObj))
	{
		// Clear background
		SGUI_Basic_DrawRectangle(pstDeviceIF, pstObj->stLayout.iPosX, pstObj->stLayout.iPosY, pstObj->stLayout.iWidth, pstObj->stLayout.iHeight, SGUI_COLOR_BKGCLR, SGUI_COLOR_BKGCLR);
		if((pstObj->iSelection > SGUI_INVALID_INDEX) && (pstObj->iSelection < pstObj->iCount))
		{
			stItemPaintArea.iPosX =	pstObj->stLayout.iPosX;
			stItemPaintArea.iPosY = pstObj->stLayout.iPosY;
			stItemPaintArea.iWidth = pstObj->stLayout.iWidth;
			/* Judge selected item is in visible area. */
			if(pstObj->iSelection < pstObj->iPageStartIndex)
			{
				pstObj->iPageStartIndex = pstObj->iSelection;
				pstObj->iPageEndIndex = pstObj->iPageStartIndex + pstObj->iVisibleItems - 1;
			}
			else if(pstObj->iSelection > pstObj->iPageEndIndex)
			{
				pstObj->iPageEndIndex = pstObj->iSelection;
				pstObj->iPageStartIndex = pstObj->iPageEndIndex - pstObj->iVisibleItems + 1;
			}
			/* Judge selected item is beginning or ending. */
			if(pstObj->iSelection == pstObj->iPageStartIndex)
			{
				pstObj->iItemPaintOffset = 0;
				stItemPaintArea.iHeight = (pstObj->iVisibleItems>1)?(ITEM_HEIGHT(pstObj->pstFontRes)):(pstObj->stLayout.iHeight);
			}
			else if(pstObj->iSelection == pstObj->iPageEndIndex)
			{
				pstObj->iItemPaintOffset = (((pstObj->stLayout.iHeight)%ITEM_HEIGHT(pstObj->pstFontRes))-ITEM_HEIGHT(pstObj->pstFontRes))%ITEM_HEIGHT(pstObj->pstFontRes);
				stItemPaintArea.iHeight = ITEM_HEIGHT(pstObj->pstFontRes)+pstObj->iItemPaintOffset;
			}
			else
			{
				stItemPaintArea.iHeight = ITEM_HEIGHT(pstObj->pstFontRes);
			}

			/* Paint first visible item. */
			iItemIndex=pstObj->iPageStartIndex;
			stItemTextPos.iPosY = pstObj->iItemPaintOffset+1;
			cszItemText = (NULL==pstObj->pstItems[iItemIndex].szVariableText)?pstObj->pstItems[iItemIndex].cszLabelText:pstObj->pstItems[iItemIndex].szVariableText;
			SGUI_Text_DrawText(pstDeviceIF, cszItemText, pstObj->pstFontRes, &stItemPaintArea, &stItemTextPos, iItemIndex==pstObj->iSelection?SGUI_DRAW_REVERSE:SGUI_DRAW_NORMAL);
			iItemIndex++;
			stItemPaintArea.iHeight = ITEM_HEIGHT(pstObj->pstFontRes);
			if(pstObj->iVisibleItems > 1)
			{
				stItemPaintArea.iPosY += ITEM_HEIGHT(pstObj->pstFontRes)+(pstObj->iItemPaintOffset);
				stItemTextPos.iPosY = 1;
				while((iItemIndex != pstObj->iPageEndIndex) && (iItemIndex < pstObj->iCount))
				{
					cszItemText = (NULL==pstObj->pstItems[iItemIndex].szVariableText)?pstObj->pstItems[iItemIndex].cszLabelText:pstObj->pstItems[iItemIndex].szVariableText;
					SGUI_Text_DrawText(pstDeviceIF, cszItemText, pstObj->pstFontRes, &stItemPaintArea, &stItemTextPos, iItemIndex==pstObj->iSelection?SGUI_DRAW_REVERSE:SGUI_DRAW_NORMAL);
					stItemPaintArea.iPosY += ITEM_HEIGHT(pstObj->pstFontRes);
					iItemIndex++;
				}
				if(iItemIndex < pstObj->iCount)
				{
					/* Paint last visible item. */
					stItemPaintArea.iHeight = (0==pstObj->iItemPaintOffset)?(pstObj->stLayout.iHeight%ITEM_HEIGHT(pstObj->pstFontRes)):(ITEM_HEIGHT(pstObj->pstFontRes));
					/* Correct last visible item height when items area height is an integer multiple of item height. */
					stItemPaintArea.iHeight = (0==stItemPaintArea.iHeight)?ITEM_HEIGHT(pstObj->pstFontRes):stItemPaintArea.iHeight;
					cszItemText = (NULL==pstObj->pstItems[iItemIndex].szVariableText)?pstObj->pstItems[iItemIndex].cszLabelText:pstObj->pstItems[iItemIndex].szVariableText;
					SGUI_Text_DrawText(pstDeviceIF, cszItemText, pstObj->pstFontRes, &stItemPaintArea, &stItemTextPos, iItemIndex==pstObj->iSelection?SGUI_DRAW_REVERSE:SGUI_DRAW_NORMAL);
				}
			}
		}
	}
}