/*************************************************************************/
/** Copyright.                                                          **/
/** FileName: SGUI_ScrollBar.c                                          **/
/** Author: XuYulin                                                     **/
/** Description: Create and display a scrollbar on screen.              **/
/*************************************************************************/

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

//=======================================================================//
//= Function define.                                                    =//
//=======================================================================//
/*************************************************************************/
/** Function Name:  SGUI_ScrollBar_Initialize                           **/
/** Purpose:        Initialize a scroll bar structure.                  **/
/** Params:                                                             **/
/** @ pstObj[in]:   Scroll bar object pointer.                          **/
/** @ pcstInitParam[in]: Initialize parameter data.                     **/
/** Return:         None.                                               **/
/*************************************************************************/
void SGUI_ScrollBar_Initialize(SGUI_SCROLLBAR_STRUCT* pstObj, const SGUI_SCROLLBAR_PARAM* pcstInitParam)
{
    /*----------------------------------*/
    /* Process                          */
    /*----------------------------------*/
    if((NULL != pstObj) && (NULL != pcstInitParam))
    {
        SGUI_SystemIF_MemorySet(pstObj, 0x00, sizeof(SGUI_SCROLLBAR_STRUCT));
        SGUI_SystemIF_MemoryCopy(&(pstObj->stParam), (void*)pcstInitParam, sizeof(SGUI_SCROLLBAR_PARAM));
    }
}

/*************************************************************************/
/** Function Name:  SGUI_ScrollBar_SetValue                             **/
/** Purpose:        Initialize a scroll bar structure.                  **/
/** Params:                                                             **/
/** @ pstObj[in]:   Scroll bar object pointer.                          **/
/** @ sNewValue[in]: New value will be set.                             **/
/** Return:         None.                                               **/
/*************************************************************************/
void SGUI_ScrollBar_SetValue(SGUI_SCROLLBAR_STRUCT* pstObj, SGUI_SIZE sNewValue)
{
    if(NULL != pstObj)
    {
        if(sNewValue > pstObj->stParam.sMaxValue)
        {
            pstObj->stData.sValue = pstObj->stParam.sMaxValue;
        }
        else
        {
            pstObj->stData.sValue = sNewValue;
        }
    }
}

/*************************************************************************/
/** Function Name:  SGUI_ScrollBar_RefreshScrollBar                     **/
/** Purpose:        Display or update a scroll bar.                     **/
/** Resources:      Scroll bar data structure.                          **/
/** Params:                                                             **/
/** @ pstObj[in]:   Scroll bar data structure pointer.                  **/
/** Return:         None.                                               **/
/** Notice:         None.                                               **/
/*************************************************************************/
void SGUI_ScrollBar_Repaint(SGUI_SCR_DEV* pstDeviceIF, SGUI_SCROLLBAR_STRUCT* pstObj)
{
    /*----------------------------------*/
    /* Variable Declaration             */
    /*----------------------------------*/
    SGUI_INT                    uiScrollBlockPos;
    SGUI_SIZE                   uiScrollBlockSize;

    /*----------------------------------*/
    /* Initialize                       */
    /*----------------------------------*/
    if(SGUI_SCROLLBAR_VERTICAL == pstObj->stParam.eDirection)
    {
        uiScrollBlockSize = pstObj->stParam.stLayout.iWidth-2;
    }
    else
    {
        uiScrollBlockSize = pstObj->stParam.stLayout.iHeight-2;
    }

    /*----------------------------------*/
    /* Process                          */
    /*----------------------------------*/
    if(((pstObj->stParam.stLayout.iHeight > 2) && (pstObj->stParam.stLayout.iWidth > 2)) && (pstObj->stParam.stLayout.iHeight != pstObj->stParam.stLayout.iWidth))
    {
        // Check new value must be less then max value.
        if(pstObj->stData.sValue > pstObj->stParam.sMaxValue)
        {
            pstObj->stData.sValue = pstObj->stParam.sMaxValue;
        }
        // Draw scroll bar edge.
        SGUI_Basic_DrawRectangle3(pstDeviceIF, &(pstObj->stParam.stLayout), SGUI_COLOR_FRGCLR, SGUI_COLOR_BKGCLR);
        if(SGUI_SCROLLBAR_VERTICAL == pstObj->stParam.eDirection)
        {
            // Value lower limit is 0, scroll blocks must be greater then 0.
            if(pstObj->stParam.sMaxValue > 0)
            {
                uiScrollBlockPos = pstObj->stParam.stLayout.iY+1+((pstObj->stParam.stLayout.iHeight-uiScrollBlockSize-2)*pstObj->stData.sValue/pstObj->stParam.sMaxValue);
                // Redraw process block
                SGUI_Basic_DrawRectangle1(pstDeviceIF, pstObj->stParam.stLayout.iX+1, uiScrollBlockPos,
                                        uiScrollBlockSize, uiScrollBlockSize, SGUI_COLOR_FRGCLR, SGUI_COLOR_FRGCLR);
            }
            else
            {
                SGUI_Basic_DrawRectangle1(pstDeviceIF, pstObj->stParam.stLayout.iX+1, pstObj->stParam.stLayout.iY+1,
                                        uiScrollBlockSize, uiScrollBlockSize, SGUI_COLOR_FRGCLR, SGUI_COLOR_FRGCLR);
            }
        }
        else // Horizontal
        {
            // Value lower limit is 0, scroll blocks must be greater then 0.
            if(pstObj->stParam.sMaxValue > 0)
            {
                uiScrollBlockPos = pstObj->stParam.stLayout.iX+1+((pstObj->stParam.stLayout.iWidth-uiScrollBlockSize-2)*pstObj->stData.sValue/pstObj->stParam.sMaxValue);
                // Redraw process block
                SGUI_Basic_DrawRectangle1(pstDeviceIF, uiScrollBlockPos, pstObj->stParam.stLayout.iY+1,
                                        uiScrollBlockSize, uiScrollBlockSize, SGUI_COLOR_FRGCLR, SGUI_COLOR_FRGCLR);
            }
            else
            {
                SGUI_Basic_DrawRectangle1(pstDeviceIF, pstObj->stParam.stLayout.iX+1, pstObj->stParam.stLayout.iY+1,
                                        uiScrollBlockSize, uiScrollBlockSize, SGUI_COLOR_FRGCLR, SGUI_COLOR_FRGCLR);
            }
        }
    }
}