rangeslider.c

读取音乐光盘磁道为磁盘文件的DLL源码

  w = rc.right;
  h = rc.bottom;

#if 1
  if ( !lpr->hCompDC )
    lpr->hCompDC = CreateCompatibleDC( hDC );
  hCompDC = lpr->hCompDC;
  if ( !lpr->hBmp )
    lpr->hBmp = CreateCompatibleBitmap( hDC, w, h );
  hBmp = lpr->hBmp;
#else
  hCompDC = CreateCompatibleDC( hDC );
  hBmp = CreateCompatibleBitmap( hDC, w, h );
#endif
  SelectObject( hCompDC, hBmp );

  FillRect( hCompDC, &rc, lpr->hBackground );

  // Draw the tic marks
  SelectObject( hCompDC, lpr->hBlackPen );
  for( i = 0; i < lpr->numTics; i++ )
    {
      xOfs = ((w - 7) * lpr->tic[i] / (lpr->max - lpr->min)) + 3;
      pt[0].x = xOfs; pt[0].y = 15;
      pt[1].x = xOfs; pt[1].y = 19;
      Polyline( hCompDC, pt, 2 );
      pt[0].y = 24 + HEIGHTSLIDER;
      pt[1].y = 20 + HEIGHTSLIDER;
      Polyline( hCompDC, pt, 2 );
    }

#if 0
  pt[0].x = w - 4; pt[0].y = 15;
  pt[1].x = w - 4; pt[1].y = 19;
  Polyline( hCompDC, pt, 2 );

  pt[0].x = w - 4; pt[0].y = 24 + HEIGHTSLIDER;
  pt[1].x = w - 4; pt[1].y = 20 + HEIGHTSLIDER;
  Polyline( hCompDC, pt, 2 );
#endif

  rc.left = 1;
  rc.right = w - 1;
  rc.top = 20;
  rc.bottom = rc.top + HEIGHTSLIDER;
  FillRect( hCompDC, &rc, (HBRUSH)GetStockObject( WHITE_BRUSH ) );

  // draw 3-d edge
  SelectObject( hCompDC, lpr->hDkGreyPen );
  pt[0].x = rc.left; pt[0].y = rc.top + HEIGHTSLIDER - 2;
  pt[1].x = rc.left; pt[1].y = rc.top; 
  pt[2].x = rc.right - 1; pt[2].y = rc.top;
  Polyline( hCompDC, pt, 3 );

  SelectObject( hCompDC, lpr->hBlackPen );
  pt[0].x++;  pt[0].y--;
  pt[1].x++;  pt[1].y++;
  pt[2].x--;  pt[2].y++;
  Polyline( hCompDC, pt, 3 );

  SelectObject( hCompDC, lpr->hLtGreyPen );
  pt[0].y++;
  pt[1].x = rc.right-2; pt[1].y = pt[0].y;
  pt[2].x = rc.right-2; pt[2].y--;
  Polyline( hCompDC, pt, 3 );

  rc.top += 2;
  rc.bottom -= 2;
  rc.left = ((w - 7) * lpr->start / (lpr->max - lpr->min)) + 3;
  // we have to increment the right corner, since FillRect fills up to, but
  // not including the right and bottom edges.
  rc.right = ((w - 7) * lpr->finish / (lpr->max - lpr->min)) + 4;

  FillRect( hCompDC, &rc, lpr->hGreenBrush );

  BitBlt( hDC, 0, 0, w, h, hCompDC, 0, 0, SRCCOPY );

  rc.left = 3;
  rc.right = w - 4;
  rc.top = 20;
  rc.bottom = rc.top + HEIGHTSLIDER;

  //xOfs = (rc.right - rc.left) * lpr->start / (lpr->max - lpr->min);
  xOfs = (w-7) * lpr->start / (lpr->max - lpr->min);
  SelectObject( hCompDC, lpr->hTop );
  BitBlt( hDC, xOfs, 0, 7, 14, hCompDC, 0, 0, SRCCOPY );

  xOfs = (w-7) * lpr->finish / (lpr->max - lpr->min);
  SelectObject( hCompDC, lpr->hBottom );

  BitBlt( hDC, xOfs, 25 + HEIGHTSLIDER, 7, 14, hCompDC, 0, 0, SRCCOPY );

  //DeleteDC( hCompDC );
  //DeleteObject( hBmp );

  EndPaint( hWnd, &p );
}


BOOL sliderHandleLButtonDown( HWND hWnd, LPRANGESLIDERSTRUCT lpr, 
			      LPARAM lParam )
{
  POINTS pt = MAKEPOINTS( lParam );

  if ( !lpr->bInDrag )
    {
      if ( SliderHitTest( hWnd, TOPSLIDER, lParam, lpr ) )
	{
	  SetCapture( hWnd );
	  lpr->bInDrag = TRUE;
	  lpr->which = TOPSLIDER;
	}
      else if ( SliderHitTest( hWnd, BOTTOMSLIDER, lParam, lpr ) )
	{
	  SetCapture( hWnd );
	  lpr->bInDrag = TRUE;
	  lpr->which = BOTTOMSLIDER;
	  lpr->xOfsStart = (lpr->rc.right - 7) * lpr->finish / (lpr->max - lpr->min) + 3;
	}
      else if ( SliderLeftHitTest( hWnd, TOPSLIDER, lParam, lpr ) )
	{
	  SendMessage( hWnd, RSB_SNAP, TOPSLIDER, 0 );
	  return TRUE;
	}
      else if ( SliderLeftHitTest( hWnd, BOTTOMSLIDER, lParam, lpr ) )
	{
	  SendMessage( hWnd, RSB_SNAP, BOTTOMSLIDER, 0 );
	  return TRUE;
	}
      else if ( SliderRightHitTest( hWnd, TOPSLIDER, lParam, lpr ) )
	{
	  SendMessage( hWnd, RSB_SNAP, TOPSLIDER, 1 );
	  return TRUE;
	}
      else if ( SliderRightHitTest( hWnd, BOTTOMSLIDER, lParam, lpr ) )
	{
	  SendMessage( hWnd, RSB_SNAP, BOTTOMSLIDER, 1 );
	  return TRUE;
	}
      if ( lpr->bInDrag )
	{
	  lpr->xStart = pt.x;
	  lpr->yStart = pt.y;
	}
    }

  return FALSE;
}


BOOL sliderHandleLButtonUp( HWND hWnd, LPRANGESLIDERSTRUCT lpr, LPARAM lParam )
{
  if ( lpr->bInDrag )
    {
      ReleaseCapture();
      lpr->bInDrag = FALSE;
      SendSliderNotifyChanged( hWnd, lpr );
    }

  return FALSE;
}


#if 0
  rc.left = ((w - 7) * lpr->start / (lpr->max - lpr->min)) + 3;
  rc.right = ((w - 7) * lpr->finish / (lpr->max - lpr->min)) + 3;
#endif



BOOL sliderHandleMouseMove( HWND hWnd, LPRANGESLIDERSTRUCT lpr, LPARAM lParam )
{
  int xOfs;
  POINTS pt;
  DWORD dwNewValue;

  pt = MAKEPOINTS( lParam );

  if ( lpr->bInDrag )
    {
      xOfs = pt.x - 3;
      if ( xOfs < 0 )
	xOfs = 0;
      else if ( xOfs > (lpr->rc.right - 7) )
	xOfs = lpr->rc.right - 7;

      switch( lpr->which )
	{
	case TOPSLIDER:
	  dwNewValue = xOfs * (lpr->max - lpr->min) / (lpr->rc.right - 7);
	  if ( SendSliderNotifyChanging( hWnd, lpr, dwNewValue ) )
	    {
	      lpr->start = dwNewValue;
	      //SendSliderNotifyChanged( hWnd, lpr );
	    }
	  return TRUE;

	case BOTTOMSLIDER:
	  dwNewValue = xOfs * (lpr->max - lpr->min) / (lpr->rc.right - 7);
	  if ( SendSliderNotifyChanging( hWnd, lpr, dwNewValue ) )
	    {
	      lpr->finish = dwNewValue;
	      //SendSliderNotifyChanged( hWnd, lpr );
	    }
	  return TRUE;
	}
    }

  return FALSE;
}



/*
 * "Snaps" a slider either left or right to the nearest tic mark.
 *
 * wParam: which slider (TOPSLIDER or BOTTOMSLIDER)
 * lParam: left (0) or right (1)
 */
BOOL sliderHandleSnap( HWND hWnd, WPARAM wParam, BOOL bRight, LPRANGESLIDERSTRUCT lpr )
{
  int i;
  DWORD dwPos;
  DWORD dwCurrent;

  if ( (wParam != TOPSLIDER) && (wParam != BOTTOMSLIDER) )
    return FALSE;

  if ( lpr->numTics == 0 )
    return FALSE;

  if ( bRight )
    dwPos = lpr->min;
  else
    dwPos = lpr->max;

  lpr->which = (int)wParam;

  // find the leftmost or rightmost tic mark
  for( i = 0; i < lpr->numTics; i++ )
    {
      if ( bRight )
	{
	  if ( lpr->tic[i] > dwPos )
	    dwPos = lpr->tic[i];
	}
      else
	{
	  if ( lpr->tic[i] < dwPos )
	    dwPos = lpr->tic[i];
	}
    }

  dwCurrent = (wParam == TOPSLIDER)?lpr->start:lpr->finish;
  for( i = 0; i < lpr->numTics; i++ )
    {
      if ( bRight )
	{
	  if ( (lpr->tic[i] > dwCurrent) && (lpr->tic[i] < dwPos) )
	    dwPos = lpr->tic[i];
	}
      else
	{
	  if ( (lpr->tic[i] < dwCurrent) && (lpr->tic[i] > dwPos) )
	    dwPos = lpr->tic[i];
	}
    }

  lpr->which = (int)wParam;
  if ( wParam == TOPSLIDER )
    {
      if ( SendSliderNotifyChanging( hWnd, lpr, dwPos ) )
	lpr->start = dwPos;
    }
  else
    {
      if ( SendSliderNotifyChanging( hWnd, lpr, dwPos ) )
	lpr->finish = dwPos;
    }

  SendSliderNotifyChanged( hWnd, lpr );  

  return TRUE;
}


BOOL SendSliderNotifyChanging( HWND hWnd, LPRANGESLIDERSTRUCT lpr, DWORD dwNew )
{
  RSBNOTIFY rsb;

  ZeroMemory( &rsb, sizeof(rsb) );

  rsb.hdr.hwndFrom = hWnd;
  rsb.hdr.idFrom = (UINT)GetWindowLong( hWnd, GWL_ID );
  rsb.which = lpr->which;
  if ( lpr->which == TOPSLIDER )
    {
      rsb.hdr.code = RSBN_STARTCHANGING;
      rsb.newStart = dwNew;
      rsb.newFinish = lpr->finish;
    }
  else
    {
      rsb.hdr.code = RSBN_FINISHCHANGING;
      rsb.newStart = lpr->start;
      rsb.newFinish = dwNew;
    }
  rsb.start = lpr->start;
  rsb.finish = lpr->finish;

  if ( SendMessage( GetParent( hWnd ), WM_NOTIFY, (WPARAM)rsb.hdr.idFrom,
		    (LPARAM)&rsb ) )
    return TRUE;

  return FALSE;
}


BOOL SendSliderNotifyChanged( HWND hWnd, LPRANGESLIDERSTRUCT lpr )
{
  RSBNOTIFY rsb;

  ZeroMemory( &rsb, sizeof(rsb) );

  rsb.hdr.hwndFrom = hWnd;
  rsb.hdr.idFrom = (UINT)GetWindowLong( hWnd, GWL_ID );
  rsb.which = lpr->which;
  if ( lpr->which == TOPSLIDER )
    {
      rsb.hdr.code = RSBN_STARTCHANGED;
    }
  else
    {
      rsb.hdr.code = RSBN_FINISHCHANGED;
    }
  rsb.start = lpr->start;
  rsb.finish = lpr->finish;
  rsb.newStart = lpr->start;
  rsb.newFinish = lpr->finish;

  SendMessage( GetParent( hWnd ), WM_NOTIFY, (WPARAM)rsb.hdr.idFrom,
		    (LPARAM)&rsb );

  return TRUE;
}