/*
*********************************************************************************************************
*                                                uC/GUI
*                        Universal graphic software for embedded applications
*
*                       (c) Copyright 2002, Micrium Inc., Weston, FL
*                       (c) Copyright 2002, SEGGER Microcontroller Systeme GmbH
*
*              礐/GUI is protected by international copyright laws. Knowledge of the
*              source code may not be used to write a similar product. This file may
*              only be used in accordance with a license and should not be redistributed
*              in any way. We appreciate your understanding and fairness.
*
----------------------------------------------------------------------
File        : SCROLLBAR.c
Purpose     : SCROLLBAR for new emWin GSC widgets
---------------------------END-OF-HEADER------------------------------
*/

#include <stdlib.h>
#include <string.h>
#include "GUI_Private.h"
#include "SCROLLBAR.h"
#include "Widget.h"


#if GUI_WINSUPPORT

/*********************************************************************
*
*       Private config defaults
*
**********************************************************************
*/

/* Support for 3D effects */
#ifndef SCROLLBAR_USE_3D
  #define SCROLLBAR_USE_3D 1
#endif

/* Define colors */
#ifndef SCROLLBAR_BKCOLOR0_DEFAULT
  #define SCROLLBAR_BKCOLOR0_DEFAULT 0x808080
#endif

#ifndef SCROLLBAR_BKCOLOR1_DEFAULT
  #define SCROLLBAR_BKCOLOR1_DEFAULT GUI_BLACK
#endif

#ifndef SCROLLBAR_COLOR0_DEFAULT
  #define SCROLLBAR_COLOR0_DEFAULT 0xc0c0c0
#endif

#ifndef SCROLLBAR_COLOR1_DEFAULT
  #define SCROLLBAR_COLOR1_DEFAULT GUI_BLACK
#endif


/*********************************************************************
*
*       Object definition
*
**********************************************************************
*/

typedef struct {
  WIDGET Widget;
  GUI_COLOR aBkColor[2];
  GUI_COLOR aColor[2];
  int NumItems, v, PageSize;
  #if GUI_DEBUG_LEVEL >1
    int DebugId;
  #endif  
} SCROLLBAR_Obj;

typedef struct {
  int x1_LeftArrow;
  int x0_Thumb;
  int x1_Thumb;
  int x0_RightArrow;
  int xSizeMoveable;
  int ThumbSize;
} POSITIONS;

/*********************************************************************
*
*       Static data
*
**********************************************************************
*/

I16 _DefaultWidth = 11;

/*********************************************************************
*
*       Macros for internal use
*
**********************************************************************
*/

#define SCROLLBAR_ID 0x4544   /* Magic numer, should be unique if possible */

#define SCROLLBAR_H2P(h) (SCROLLBAR_Obj*) WM_H2P(h)

#ifdef _DEBUG
  #define SCROLLBAR_ASSERT_IS_VALID_PTR(p) DEBUG_ERROROUT_IF(p->DebugId != SCROLLBAR_ID, "xxx.c: Wrong handle type or Object not init'ed")
  #define SCROLLBAR_INIT_ID(p)   p->DebugId = SCROLLBAR_ID
  #define SCROLLBAR_DEINIT_ID(p) p->DebugId = SCROLLBAR_ID+1
#else
  #define SCROLLBAR_ASSERT_IS_VALID_PTR(p)
  #define SCROLLBAR_INIT_ID(p)
  #define SCROLLBAR_DEINIT_ID(p)
#endif

/*********************************************************************
*
*       Static routines
*
**********************************************************************
*/
static int _GetArrowSize(SCROLLBAR_Obj* pObj) {
  unsigned int r;
  unsigned int xSize = WIDGET__GetXSize(&pObj->Widget);
  unsigned int ySize = WIDGET__GetYSize(&pObj->Widget);
  r = ySize/2 + 5;
  if (r > xSize-5)
    r = xSize-5;
  return r;
}

/*********************************************************************
*
*       _GetPositions

  Calculates all positions required for drawing or for mouse / touch
  evaluation.
*/
static void _GetPositions(SCROLLBAR_Obj* pObj, POSITIONS* pPos) {
  int xSizeArrow, xSize, xSizeMoveable, ThumbSize, NumItems, xSizeThumbArea;
  NumItems      = pObj->NumItems;
  xSize         = WIDGET__GetXSize(&pObj->Widget);
  xSizeArrow    = _GetArrowSize(pObj);
  xSizeThumbArea= xSize - 2*xSizeArrow;     /* Number of pixels available for thumb and movement */
  ThumbSize     = GUI__DivideRound(xSizeThumbArea * pObj->PageSize, NumItems);
  if (ThumbSize < 4)
    ThumbSize = 4;
  xSizeMoveable = xSizeThumbArea - ThumbSize;
  pPos->x1_LeftArrow  = xSizeArrow-1;
  pPos->x0_RightArrow = xSize - xSizeArrow;
  pPos->x0_Thumb      = pPos->x1_LeftArrow + 1+ GUI__DivideRound(xSizeMoveable * pObj->v, NumItems - pObj->PageSize);
  pPos->x1_Thumb      = pPos->x0_Thumb + ThumbSize - 1;
  pPos->xSizeMoveable = xSizeMoveable;
  pPos->ThumbSize     = ThumbSize;
}

/*********************************************************************
*
*       _DrawTriangle
*/
static void _DrawTriangle(WIDGET* pWidget, int x, int y, int Size, int Inc) {
  if (pWidget->State & WIDGET_STATE_VERTICAL) {
    for (; Size >= 0; Size--, x += Inc) {
      GUI_DrawHLine(x, y - Size, y + Size);
    }
  } else {
    for (; Size >= 0; Size--, x += Inc) {
      GUI_DrawVLine(x, y - Size, y + Size);
    }
  }
}

/*********************************************************************
*
*       _Paint
*/
static void _Paint(SCROLLBAR_Obj* pObj) {
  int xArrow, ArrowSize, ArrowOff;
  POSITIONS Pos;
  GUI_RECT r, rClient;
  /*
    Get / calc position info
  */
  _GetPositions(pObj, &Pos);
  xArrow = _GetArrowSize(pObj);
  WIDGET__GetClientRect(&pObj->Widget, &rClient);
  r = rClient;
  ArrowSize = ((r.y1 - r.y0) /3) - 1;
  /*
    Draw the thumb area ( optimized ... We could also fill using GUI_Clear())
  */
  GUI_SetColor(pObj->aBkColor[0]);
  r = rClient;
  r.x0 = Pos.x1_LeftArrow + 1;
  r.x1 = Pos.x0_Thumb - 1;
  WIDGET__FillRectEx(&pObj->Widget, &r);
  r.x0 = Pos.x1_Thumb + 1;
  r.x1 = Pos.x0_RightArrow - 1;
  WIDGET__FillRectEx(&pObj->Widget, &r);
  /*
    Draw left Arrow
  */
  ArrowOff = 3 + ArrowSize+ ArrowSize/3;
  GUI_SetColor(pObj->aColor[0]);
  r = rClient;
  r.x1 = xArrow-1;
  WIDGET__FillRectEx(&pObj->Widget, &r);
  GUI_SetColor(pObj->aBkColor[1]);
  _DrawTriangle(&pObj->Widget, r.x0 + ArrowOff, (r.y1 - r.y0) >> 1, ArrowSize, -1);
  WIDGET__EFFECT_DrawUpRect(&pObj->Widget, &r);
  /*
    Draw right Arrow
  */
  GUI_SetColor(pObj->aColor[0]);
  r = rClient;
  r.x0 = r.x1 - (xArrow - 1);
  WIDGET__FillRectEx(&pObj->Widget, &r);
  GUI_SetColor(pObj->aBkColor[1]);
  _DrawTriangle(&pObj->Widget, r.x1 - ArrowOff, (r.y1 - r.y0) >> 1, ArrowSize, 1);
  WIDGET__EFFECT_DrawUpRect(&pObj->Widget, &r);
  /*
    Draw Thumb
  */
  r = rClient;
  r.x0 = Pos.x0_Thumb;
  r.x1 = Pos.x1_Thumb;
  GUI_SetColor(pObj->aColor[0]);
  WIDGET__FillRectEx(&pObj->Widget, &r);
  WIDGET__EFFECT_DrawUpRect(&pObj->Widget, &r);
}


/*********************************************************************
*
*       _OnTouch
*/
static void _OnTouch(SCROLLBAR_Handle hObj, SCROLLBAR_Obj* pObj, WM_MESSAGE*pMsg) {
  POSITIONS Pos;
  GUI_TOUCH_tState* pState = (GUI_TOUCH_tState*)pMsg->Data.p;
  if (pMsg->Data.p) {  /* Something happened in our area (pressed or released) */
    if (pState->Pressed) {
      int Sel;
      int Range;
      int x;
      Sel = pObj->v;
      _GetPositions(pObj, &Pos);
      Range = pObj->NumItems - pObj->PageSize;
      /* Swap mouse coordinates if necessary */
      if (pObj->Widget.State & WIDGET_STATE_VERTICAL) {
        int t = pState->x;
        pState->x = pState->y;
        pState->y = t;
      }
      x = pState->x;
      if (x <= Pos.x1_LeftArrow) {         /* left arrow (line left) */
        Sel--;
      } else if (x < Pos.x0_Thumb) {       /* left area  (page left) */
        Sel -= pObj->PageSize;
      } else if (x <= Pos.x1_Thumb) {      /* Thumb area */
        if (Pos.xSizeMoveable > 0) {
          x = x - Pos.ThumbSize/2 - Pos.x1_LeftArrow-1;
          Sel = GUI__DivideRound(Range * x, Pos.xSizeMoveable);
        }
      } else if (x < Pos.x0_RightArrow) {  /* right area (page right) */
        Sel += pObj->PageSize;
      } else {
        Sel++;
      }