bitmapslider.cpp

MiniCA V2.0版本源码。《小型CA系统V2.1含源码》发表以来

// BitmapSlider.cpp : implementation file
//

#include "stdafx.h"
#include "BitmapSlider.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
//
// CBitmapSlider v1.5
//
// It's free for everywhere - 16/September/2003 - Joon-ho Ryu
//
/////////////////////////////////////////////////////////////////////////////


CBitmapSlider::CBitmapSlider()
{
	m_nPos = m_nMin = 0;
	m_nMax = 100;
	m_nPage = 20;

	m_nMarginLeft = m_nMarginRight = m_nMarginTop = m_nMarginBottom = 0;
	m_nThumbWidth = m_nThumbHeight = 0;

	m_bChannel = m_bVertical = m_bThumb = m_bLButtonDown = FALSE;

	m_bFocusRect = m_bFocus = FALSE;
	m_bDrawFocusRect = TRUE;

	m_bEnable = TRUE;

	m_nThumbBgX = m_nThumbBgY = -1;
}

CBitmapSlider::~CBitmapSlider()
{
}


BEGIN_MESSAGE_MAP(CBitmapSlider, CStatic)
	//{{AFX_MSG_MAP(CBitmapSlider)
	ON_WM_ERASEBKGND()
	ON_WM_PAINT()
	ON_WM_LBUTTONDOWN()
	ON_WM_MOUSEMOVE()
	ON_WM_LBUTTONUP()
	ON_WM_GETDLGCODE()
	ON_WM_KEYDOWN()
	ON_WM_KILLFOCUS()
	ON_WM_SETFOCUS()
	ON_WM_CREATE()
	ON_WM_DESTROY()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CBitmapSlider message handlers

BOOL CBitmapSlider::OnEraseBkgnd(CDC* pDC) 
{	
	// Do not erase background for the transparency effect
	return TRUE;
}

// Draw channel and thumb
//
void CBitmapSlider::OnPaint() 
{
	CPaintDC dcOrigin(this);

	// "Flicker Free Drawing In MFC" by Keith Rule
	CMemDC dc( &dcOrigin, &m_rect, m_bTransparentChannel );

	CDC dcMem;
	dcMem.CreateCompatibleDC( &dc );

	CBitmap *pbmTmp;

	// Delete focus rectangle for transparent channel
	if( m_bFocusRect && ( m_bTransparentChannel || !m_bChannel ) ) {

		dc.DrawFocusRect( m_rect );
		m_bFocusRect = FALSE;
	}

	// Draw channel
	if( m_bChannel ) {

		pbmTmp = dcMem.SelectObject( &m_bmChannel );

		// There is a bitmap for active channel
		if( m_bChannelActive && m_bEnable ) {

			// Vertical slider
			if( m_bVertical ) {

				// Lower part
				DrawBitmap( &dc, 0, Pos2Pixel(m_nPos),
					m_nWidth, m_nHeight - Pos2Pixel(m_nPos),
					&dcMem, 0, Pos2Pixel(m_nPos),
					&m_bmChannelActiveMask, m_bTransparentChannel );

				dcMem.SelectObject( &m_bmChannelActive );

				// Upper part
				DrawBitmap( &dc, 0, 0, m_nWidth, Pos2Pixel(m_nPos),
					&dcMem, 0, 0, &m_bmChannelMask, m_bTransparentChannel );

			// Horizontal slider
			} else {

				// Right side
				DrawBitmap( &dc, Pos2Pixel(m_nPos), 0,
					m_nWidth - Pos2Pixel(m_nPos), m_nHeight,
					&dcMem, Pos2Pixel(m_nPos), 0, 
					&m_bmChannelActiveMask, m_bTransparentChannel );

				dcMem.SelectObject( &m_bmChannelActive );

				// Left side
				DrawBitmap( &dc, 0, 0, Pos2Pixel(m_nPos), m_nHeight,
					&dcMem, 0, 0, &m_bmChannelMask, m_bTransparentChannel );
			}

		// Only one bitmap for channel
		} else {

			DrawBitmap( &dc, 0, 0, m_nWidth, m_nHeight,
				&dcMem, 0, 0, &m_bmChannelMask, m_bTransparentChannel );

		}

		dcMem.SelectObject( pbmTmp );
	}

	// If there is a bitmap to restore background image of a thumb
	if( m_nThumbBgX != -1 ) {

		RestoreBackground(
			&dc, m_nThumbBgX, m_nThumbBgY,
			m_nThumbWidth, m_nThumbHeight, &m_bmThumbBg );

		m_nThumbBgX = -1;
	}

	// Draw thumb
	if( m_bThumb && m_bEnable ) {

		if( m_bThumbActive && m_bLButtonDown )
			pbmTmp = dcMem.SelectObject( &m_bmThumbActive ); // Active thumb
		else
			pbmTmp = dcMem.SelectObject( &m_bmThumb ); // Normal thumb

		// Vertical slider
		if( m_bVertical ) {

			// Background image is need to be restored
			if( m_bTransparentChannel || !m_bChannel ) {

				m_nThumbBgX = m_nMarginLeft;
				m_nThumbBgY = Pos2Pixel(m_nPos) - m_nThumbHeight/2;

				CopyBackground(
					&dc, m_nThumbBgX, m_nThumbBgY,
					m_nThumbWidth, m_nThumbHeight, &m_bmThumbBg );
			}

			DrawBitmap(
				&dc, m_nMarginLeft, Pos2Pixel(m_nPos) - m_nThumbHeight/2,
				m_nThumbWidth, m_nThumbHeight,
				&dcMem, 0, 0, &m_bmThumbMask, m_bTransparentThumb );

		// Horizontal slider
		} else {

			// Background image is need to be restored
			if( m_bTransparentChannel || !m_bChannel ) {

				m_nThumbBgX = Pos2Pixel(m_nPos) - m_nThumbWidth/2;
				m_nThumbBgY = m_nMarginTop;

				CopyBackground(
					&dc, m_nThumbBgX, m_nThumbBgY,
					m_nThumbWidth, m_nThumbHeight, &m_bmThumbBg );
			}

			DrawBitmap(
				&dc, Pos2Pixel(m_nPos) - m_nThumbWidth/2, m_nMarginTop,
				m_nThumbWidth, m_nThumbHeight,
				&dcMem, 0, 0, &m_bmThumbMask, m_bTransparentThumb );

		} // if horizontal

		dcMem.SelectObject( pbmTmp );

	} // if draw thumb

	// Draw focus rectangle
	if( m_bDrawFocusRect && m_bFocus && m_bEnable ) {

		dc.DrawFocusRect( m_rect );
		m_bFocusRect = TRUE;
	}

	dcMem.DeleteDC();
}

// Sets the maximum range for the slider.
//
// Parameters:
//		[IN]	nMax
//				Maximum position for the slider.
//		[IN]	bRedraw
//				TRUE to redraw after the range is set.
//				FALSE to only change maximum position.
//
void CBitmapSlider::SetRangeMax(int nMax, BOOL bRedraw)
{
	m_nMax = nMax;
	if( bRedraw )
		Invalidate();
}

// Sets the minimum range for the slider.
//
// Parameters:
//		[IN]	nMin
//				Minimum position for the slider.
//		[IN]	bRedraw
//				TRUE to redraw after the range is set.
//				FALSE to only change minimum position.
//
void CBitmapSlider::SetRangeMin(int nMin, BOOL bRedraw)
{
	m_nMin = nMin;
	if( bRedraw )
		Invalidate();
}

// Sets the range (minimum and maximum positions) for the slider.
//
// Parameters:
//		[IN]	nMin
//				Minimum position for the slider.
//		[IN]	nMax
//				Maximum position for the slider.
//		[IN]	bRedraw
//				TRUE to redraw after the range is set.
//				FALSE to only change the range.
//
void CBitmapSlider::SetRange(int nMin, int nMax, BOOL bRedraw)
{
	SetRangeMin( nMin, FALSE );
	SetRangeMax( nMax, bRedraw );
}

// Sets the current position of the slider.
//
// Parameters:
//		[IN]	nPos
//				Specifies the new slider position.
//
void CBitmapSlider::SetPos(int nPos)
{
	m_nPos = nPos;

	// Boundary check
	if( m_nPos > m_nMax )
		m_nPos = m_nMax;
	if( m_nPos < m_nMin )
		m_nPos = m_nMin;

	Invalidate();
}

// Sets the size of the page for a control.
//
// Parameters:
//		[IN]	nSize
//				The new page size of the control.
//
// Return value:
//		The previous page size.
//
int CBitmapSlider::SetPageSize(int nSize)
{
	int nRet = m_nPage;

	m_nPage = nSize;

	return nRet;
}

// Sets the left, top, right, and bottom margins for a control
//
void CBitmapSlider::SetMargin(int nLeft, int nTop, int nRight, int nBottom )
{
	SetMarginLeft( nLeft );
	SetMarginTop( nTop );
	SetMarginRight( nRight );
	SetMarginBottom( nBottom );
}

// Enables or disables control.
//
//		[IN]	bEnable
//				TRUE to enable control.
//				FALSE to disable control.
//
void CBitmapSlider::Enable(BOOL bEnable)
{
	m_bEnable = bEnable;

	// If control is disabled during dragging
	if( !m_bEnable && m_bLButtonDown ) {

		m_bLButtonDown = FALSE;
		ReleaseCapture();
	}

	Invalidate();
}

// Specify whether draw focus rectangle or not.
//
//		[IN]	bDraw
//				TRUE to draw focus rectangle.
//				FALSE to hide focus rectangle.
//
//		[IN]	bRedraw
//				TRUE to redraw status is changed.
//				FALSE to only change the status.
//
void CBitmapSlider::DrawFocusRect(BOOL bDraw, BOOL bRedraw)
{
	m_bDrawFocusRect = bDraw;

	if( bRedraw )
		Invalidate();
}

// Load bitmaps for a channel
//
// Parameters:
//		[IN]	nChannelID
//				ID number of the bitmap resource of the channel.
//		[IN]	nActiveID
//				ID number of the bitmap resource of the active channel.
//		[IN]	bTransparent
//				TRUE to apply transparency effect.
//				FALSE to display normal bitmap.
//		[IN]	clrpTransColor
//				RGB color to treat as transparent.
//		[IN]	iTransPixelX
//				Logical x-coordinate of a point.
//				It's color will be treated as transparent.
//		[IN]	iTransPixelY
//				Logical y-coordinate of a point.
//				It's color will be treated as transparent.
//
// Return value:
//		TRUE
//			Function succeedes.
//		FALSE
//			Function failes to load bitmaps.
//
BOOL CBitmapSlider::SetBitmapChannel(
	UINT nChannelID, UINT nActiveID , BOOL bTransparent,
	COLORREF clrpTransColor, int iTransPixelX, int iTransPixelY )
{
	// This control will not have any bitmap for channel
	if( !nChannelID ) {

		m_bChannel = FALSE;

		m_bmChannel.DeleteObject();
		m_bmChannelMask.DeleteObject();
		m_bmChannelActive.DeleteObject();
		m_bmChannelActiveMask.DeleteObject();
	
		return TRUE;
	}

	// load a bitmap
	m_bmChannel.DeleteObject();

	if( !m_bmChannel.LoadBitmap( nChannelID ) )
		return FALSE;

	// Prepare mask for transparency effect.
	if( bTransparent ) {

		PrepareMask( &m_bmChannel, &m_bmChannelMask,
			clrpTransColor, iTransPixelX, iTransPixelY );
	}

	// Load a bitmap for active state.
	if( nActiveID ) {

		m_bmChannelActive.DeleteObject();

		if( !m_bmChannelActive.LoadBitmap( nActiveID ) ) {

			m_bmChannel.DeleteObject();
			if( bTransparent )
				m_bmChannelMask.DeleteObject();

			return FALSE;
		}

		if( bTransparent ) {

			PrepareMask( &m_bmChannelActive, &m_bmChannelActiveMask,
				clrpTransColor, iTransPixelX, iTransPixelY );
		}
		
		m_bChannelActive = TRUE;

	// There is no bitmap for active state.
	} else
		m_bChannelActive = FALSE;

	// Get size of bitmap.
	BITMAP	bitmap;
	m_bmChannel.GetBitmap( &bitmap );

	m_nWidth = bitmap.bmWidth;
	m_nHeight = bitmap.bmHeight;

	// Compare size
	if( m_bChannelActive ) {

		BITMAP	bitmap;
		m_bmChannelActive.GetBitmap( &bitmap );

		ASSERT( m_nWidth == bitmap.bmWidth && m_nHeight == bitmap.bmHeight );
	}

	// Change size of control as same as the bitmap.
	SetWindowPos(NULL, 0, 0, m_nWidth, m_nHeight, SWP_NOZORDER | SWP_NOMOVE);

	GetClientRect( &m_rect );

	m_bTransparentChannel = bTransparent;
	m_bChannel = TRUE;

	return TRUE;
}

// Load bitmaps for a thumb
//
// Parameters:
//		[IN]	nThumbID
//				ID number of the bitmap resource of the thumb
//		[IN]	nActiveID
//				ID number of the bitmap resource of the active thumb
//		[IN]	bTransparent
//				TRUE to apply transparency effect
//				FALSE to display normal bitmap
//		[IN]	clrpTransColor
//				RGB color to treat as transparent
//		[IN]	iTransPixelX
//				Logical x-coordinate of a point.
//				It's color will be treated as transparent
//		[IN]	iTransPixelY
//				Logical y-coordinate of a point.
//				It's color will be treated as transparent
//
// Return value:
//		TRUE
//			Function succeedes.
//		FALSE
//			Function failes to load bitmaps.
//
BOOL CBitmapSlider::SetBitmapThumb(
	UINT nThumbID, UINT nActiveID, BOOL bTransparent,
	COLORREF clrpTransColor, int iTransPixelX, int iTransPixelY )
{
	// This control will not have bitmap
	if( !nThumbID ) {

		m_bThumb = FALSE;

		m_bmThumb.DeleteObject();
		m_bmThumbMask.DeleteObject();
		m_bmThumbActive.DeleteObject();
		m_bmThumbActiveMask.DeleteObject();
		m_bmThumbBg.DeleteObject();

		return TRUE;
	}

	// load a bitmap
	m_bmThumb.DeleteObject();

	if( !m_bmThumb.LoadBitmap( nThumbID ) )
		return FALSE;