/*
*********************************************************************************************************
*                                                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     : Implementation of scrollbar widget
---------------------------END-OF-HEADER------------------------------
*/

#include <stdlib.h>
#include <string.h>
#include "GUI_Protected.h"
#include "SCROLLBAR_Private.h"
#include "WIDGET.h"
#include "WM_Intern.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

#ifndef SCROLLBAR_DEFAULT_WIDTH
  #define SCROLLBAR_DEFAULT_WIDTH 11
#endif

/*********************************************************************
*
*       Module internal data
*
**********************************************************************
*/

GUI_COLOR SCROLLBAR__aDefaultBkColor[2] = {SCROLLBAR_BKCOLOR0_DEFAULT, SCROLLBAR_BKCOLOR1_DEFAULT};
GUI_COLOR SCROLLBAR__aDefaultColor[2]   = {SCROLLBAR_COLOR0_DEFAULT, SCROLLBAR_COLOR1_DEFAULT};
I16       SCROLLBAR__DefaultWidth       =  SCROLLBAR_DEFAULT_WIDTH;

/*********************************************************************
*
*       Static routines
*
**********************************************************************
*/
/*********************************************************************
*
*       _GetArrowSize
*
*/
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;
}

/*********************************************************************
*
*       _WIDGET__RECT2VRECT
*
* Purpose:
*   Convert rectangle in real coordinates into virtual coordinates
*
* Add. info:
*   This function could eventualy be made none-static and move into
*   a module of its own.
*/
static void _WIDGET__RECT2VRECT(const WIDGET* pWidget, GUI_RECT* pRect) {
  if (pWidget->State & WIDGET_STATE_VERTICAL) {
    int xSize = pWidget->Win.Rect.x1 - pWidget->Win.Rect.x0 + 1;
    int x0, x1;
    x0 = pRect->x0;
    x1 = pRect->x1;
    pRect->x0 = pRect->y0;
    pRect->x1 = pRect->y1;
    pRect->y1 = xSize - 1 - x0;
    pRect->y0 = xSize - 1 - x1;
  }
}

/*********************************************************************
*
*       _CalcPositions
*
*  Calculates all positions required for drawing or for mouse / touch
*  evaluation.
*/
static void _CalcPositions(SCROLLBAR_Obj* pObj, SCROLLBAR_POSITIONS* pPos) {
  int xSizeArrow, xSize, xSizeMoveable, ThumbSize, NumItems, xSizeThumbArea;
  WM_HWIN hWin;
  GUI_RECT r, rSub;
  int x0, y0;
  r = pObj->Widget.Win.Rect;
  x0 = r.x0;
  y0 = r.y0;
  pPos->x1  = (pObj->Widget.State & WIDGET_STATE_VERTICAL) ? r.y1 : r.x1;
  /* Subtract the rectangle of the other scrollbar (if existing and visible) */
  if (pObj->Widget.Id == GUI_ID_HSCROLL) {
    hWin = WM_GetScrollbarV(pObj->Widget.Win.hParent);
    if (hWin) {
      WM_GetWindowRectEx(hWin, &rSub);
      if (r.x1 == rSub.x1) {
        r.x1 = rSub.x0 -1;
      }
    }
  }
  if (pObj->Widget.Id == GUI_ID_VSCROLL) {
    hWin = WM_GetScrollbarH(pObj->Widget.Win.hParent);
    if (hWin) {
      WM_GetWindowRectEx(hWin, &rSub);
      if (r.y1 == rSub.y1) {
        r.y1 = rSub.y0 -1;
      }
    }
  }
  /* Convert coordinates of this window */
  GUI_MoveRect(&r, -x0, -y0);
  /* Convert real into virtual coordinates */
  _WIDGET__RECT2VRECT(&pObj->Widget, &r);
  NumItems      = pObj->NumItems;
  xSize         = r.x1 - r.x0 + 1;
  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;
  }
  if (ThumbSize > xSizeThumbArea) {
    ThumbSize = xSizeThumbArea;
  }
  xSizeMoveable = xSizeThumbArea - ThumbSize;
  pPos->x0_LeftArrow  = r.x0;
  pPos->x1_LeftArrow  = xSizeArrow - 1;
  pPos->x1_RightArrow = xSize - 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 ArrowSize, ArrowOff;
  SCROLLBAR_POSITIONS Pos;
  GUI_RECT r, rClient;
  /*
    Get / calc position info
  */
  _CalcPositions(pObj, &Pos);
  WIDGET__GetClientRect(&pObj->Widget, &rClient);
  r = rClient;
  ArrowSize = ((r.y1 - r.y0) /3) - 1;
  ArrowOff = 3 + ArrowSize+ ArrowSize/3;
  /*
    Draw left Arrow
  */
  LCD_SetColor(pObj->aColor[0]);
  r = rClient;
  r.x0 = Pos.x0_LeftArrow;
  r.x1 = Pos.x1_LeftArrow;
  WIDGET__FillRectEx(&pObj->Widget, &r);
  LCD_SetColor(pObj->aBkColor[1]);
  _DrawTriangle(&pObj->Widget, r.x0 + ArrowOff, (r.y1 - r.y0) >> 1, ArrowSize, -1);
  WIDGET__EFFECT_DrawUpRect(&pObj->Widget, &r);
  /*
    Draw the thumb area which is not covered by the thumb
  */
  LCD_SetColor(pObj->aBkColor[0]);
  r.x0 = Pos.x1_LeftArrow + 1;
  r.x1 = Pos.x0_Thumb - 1;
  WIDGET__FillRectEx(&pObj->Widget, &r);
  r = rClient;
  r.x0 = Pos.x1_Thumb + 1;
  r.x1 = Pos.x0_RightArrow - 1;
  WIDGET__FillRectEx(&pObj->Widget, &r);
  /*
    Draw Thumb
  */
  r = rClient;
  r.x0 = Pos.x0_Thumb;
  r.x1 = Pos.x1_Thumb;
  LCD_SetColor(pObj->aColor[0]);
  WIDGET__FillRectEx(&pObj->Widget, &r);
  WIDGET__EFFECT_DrawUpRect(&pObj->Widget, &r);
  /*
    Draw right Arrow
  */
  LCD_SetColor(pObj->aColor[0]);
  r.x0 = Pos.x0_RightArrow;
  r.x1 = Pos.x1_RightArrow;
  WIDGET__FillRectEx(&pObj->Widget, &r);
  LCD_SetColor(pObj->aBkColor[1]);
  _DrawTriangle(&pObj->Widget, r.x1 - ArrowOff, (r.y1 - r.y0) >> 1, ArrowSize, 1);
  WIDGET__EFFECT_DrawUpRect(&pObj->Widget, &r);
  /*
    Draw overlap area (if any ...)
  */
  if (Pos.x1_RightArrow != Pos.x1) {
    r.x0 = Pos.x1_RightArrow + 1;
    r.x1 = Pos.x1;
    LCD_SetColor(pObj->aColor[0]);
    WIDGET__FillRectEx(&pObj->Widget, &r);
  }
}

/*********************************************************************
*
*       _ScrollbarPressed
*/
static void _ScrollbarPressed(SCROLLBAR_Handle hObj, SCROLLBAR_Obj* pObj) {
  WIDGET_OrState(hObj, SCROLLBAR_STATE_PRESSED);
  if (pObj->Widget.Win.Status & WM_SF_ISVIS) {
    WM_NotifyParent(hObj, WM_NOTIFICATION_CLICKED);
  }
}

/*********************************************************************
*
*       _ScrollbarReleased
*/
static void _ScrollbarReleased(SCROLLBAR_Handle hObj, SCROLLBAR_Obj* pObj) {
  WIDGET_AndState(hObj, SCROLLBAR_STATE_PRESSED);
  if (pObj->Widget.Win.Status & WM_SF_ISVIS) {
    WM_NotifyParent(hObj, WM_NOTIFICATION_RELEASED);
  }
}

/*********************************************************************
*
*       _OnTouch
*/
static void _OnTouch(SCROLLBAR_Handle hObj, SCROLLBAR_Obj* pObj, WM_MESSAGE*pMsg) {
  SCROLLBAR_POSITIONS Pos;
  GUI_PID_STATE* pState = (GUI_PID_STATE*)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;
      _CalcPositions(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) */