myslider.cpp

刚上传内容的相关CODEC不能单独上传。于是

// MySlider.cpp : implementation file
//

#include "stdafx.h"
#include "magicscissors.h"
#include "MySlider.h"

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

/////////////////////////////////////////////////////////////////////////////
// CMySlider
#define	IDM_SCROLL		WM_USER+1
#define	IDM_SCROLL_MOVE	WM_USER+2

CMySlider::CMySlider()
{
	m_nMin = 0;
	m_nMax = 100;
	m_nPos = 0;
	m_bClick = FALSE;
	m_bEnable = FALSE;
	m_bSet = FALSE;
	m_pSelect = NULL;
}

CMySlider::~CMySlider()
{
	if( m_pSelect ) delete [] m_pSelect;
}


BEGIN_MESSAGE_MAP(CMySlider, CStatic)
	//{{AFX_MSG_MAP(CMySlider)
	ON_WM_PAINT()
	ON_WM_ERASEBKGND()
	ON_WM_LBUTTONDOWN()
	ON_WM_MOUSEMOVE()
	ON_WM_LBUTTONUP()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMySlider message handlers

void CMySlider::OnPaint() 
{
	CPaintDC dc(this); // device context for painting
	
	// TODO: Add your message handler code here
	CRect wndRect,rect;
	GetClientRect(&rect);
	wndRect = rect;

	CDC MemDC;
	MemDC.CreateCompatibleDC(&dc);
	CBitmap bitmap;
	bitmap.CreateCompatibleBitmap( &dc, wndRect.Width(), wndRect.Height() );
	CBitmap* pBitmap = MemDC.SelectObject(&bitmap);

	int w = rect.Width()-4;
	float inc = (float)w/(m_nMax-m_nMin);
	int pos = (int)((m_nPos-m_nMin)*inc+0.5);
	
	CBrush* pBrush = (CBrush*)MemDC.SelectStockObject(WHITE_BRUSH);
	MemDC.Rectangle( rect );
	
	CBrush brush;

	// draw guide
	if( m_bEnable )
		brush.CreateSolidBrush(RGB(100,230,100));
	else
		brush.CreateSolidBrush(RGB(160,160,160));
	
	MemDC.SelectObject(&brush);
	rect.left += 2;
	rect.right -= 2;
	rect.top += 4;
	rect.bottom -= 4;
	MemDC.Rectangle(rect);
	///////////////////

	CPen pen;
	pen.CreatePen(PS_SOLID, 1, RGB(255,0,0));
	CPen* pPen = MemDC.SelectObject(&pen);
	// draw selection
	if( m_bEnable )
	{
		int sp,l,h;
		h = rect.top+1;
		l = rect.bottom-1;
		for( int i = 0 ; i < (m_nMax-m_nMin) ; i++ )
		{			
			if( m_pSelect[i] )
			{
				sp = (int)((i+m_nMin)*inc+0.5)+rect.left;
				MemDC.MoveTo(sp,h);
				MemDC.LineTo(sp,l);
			}
		}
	}
	MemDC.SelectObject(pPen);

	brush.DeleteObject();
	// draw picker
	if( m_bEnable )
		brush.CreateSolidBrush(RGB(128,128,230));
	else
		brush.CreateSolidBrush(RGB(128,128,128));
	MemDC.SelectObject(&brush);		
	rect.left = pos;
	rect.right = pos+4;
	rect.top -= 2;
	rect.bottom += 2;	
	MemDC.Rectangle(rect);
	
	////////////////////
	MemDC.SelectObject(pBrush);

	dc.BitBlt( 0, 0, wndRect.Width(), wndRect.Height(), &MemDC, 0, 0, SRCCOPY );
	MemDC.SelectObject(pBitmap);

	// Do not call CStatic::OnPaint() for painting messages
}

BOOL CMySlider::OnEraseBkgnd(CDC* pDC) 
{
	// TODO: Add your message handler code here and/or call default	
	return TRUE;
	//return CStatic::OnEraseBkgnd(pDC);
}

void CMySlider::OnLButtonDown(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	if( m_bEnable )
	{
		m_bSet = TRUE;
		CRect rect;
		GetClientRect(&rect);
		int w = rect.Width();
		float inc = (float)w/(m_nMax-m_nMin);
		int pos = (int)(point.x/inc+0.5);
		m_nPos = pos+m_nMin;
		if( m_nPos < 0 ) m_nPos = 0;
		if( m_nPos > m_nMax ) m_nPos = m_nMax;
		Invalidate();
		m_bClick = TRUE;	
		SetCapture();
	}
	CStatic::OnLButtonDown(nFlags, point);
}

void CMySlider::OnMouseMove(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	if( m_bEnable )
	{
		if( nFlags & MK_LBUTTON  && m_bClick )
		{
			CRect rect;
			GetClientRect(&rect);
			int w = rect.Width();
			float inc = (float)w/(m_nMax-m_nMin);
			int pos = (int)(point.x/inc+0.5);
			m_nPos = pos+m_nMin;
			if( m_nPos < 0 ) m_nPos = 0;
			if( m_nPos > m_nMax ) m_nPos = m_nMax;
			Invalidate();
			GetParent()->SendMessage( IDM_SCROLL_MOVE, m_nPos, 0 );
		}
	}
	CStatic::OnMouseMove(nFlags, point);
}

void CMySlider::OnLButtonUp(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	if( m_bEnable )
	{
		m_bClick = FALSE;	
		CStatic::OnLButtonUp(nFlags, point);
		ReleaseCapture();
		GetParent()->SendMessage( IDM_SCROLL, m_nPos, 0 );
		m_bSet = FALSE;
	}
	CStatic::OnLButtonUp(nFlags, point);
}

void CMySlider::SetRange(int min, int max)
{
	m_nMin = min;
	m_nMax = max;
	if( m_pSelect ) delete [] m_pSelect;
	m_pSelect = new BYTE[max-min];
	memset(m_pSelect, 0, (max-min) );
}

void CMySlider::SetPos(int n)
{
	if( m_bSet ) return;
	m_nPos = n;
	if( m_hWnd )
		Invalidate();
}

int CMySlider::GetPos()
{
	return m_nPos;
}

void CMySlider::Enable(BOOL bEnable)
{
	m_bEnable = bEnable;
}

void CMySlider::SetSelect(int n)
{
	if( m_pSelect )
		m_pSelect[n-m_nMin] = 1;
}