vc 对话框实现文字从左向右(或从右向左)循环滚动显示

[ly506ren]

我现在想在对话框中做一个跑马灯的程序，要求把放在一个static中的文字在整个屏幕从左至右或从右至左水平循环滚动，要求不能太闪，我看论坛中说用双缓冲做，但是具体细节我还不太会，谁告诉我怎么做？最好是有源代码参考下。谢谢！

[hankcs]

上面的代码很精彩，学习了

[dengzikun]

先用定时器移动static窗口看看效果，不行再考虑复杂的方法。

[Hiiishe]

#pragma once


// CGoGoStatic

class CGoGoStatic : public CStatic
{
	DECLARE_DYNAMIC(CGoGoStatic)

public:
	CGoGoStatic();
	virtual ~CGoGoStatic();

	void GoGo();
	void Stop();
	void EndGoGo();

protected:
	DECLARE_MESSAGE_MAP()
	CPoint m_ptStart;
	CSize m_szText;

	BOOL m_bIsGoing;

public:
	afx_msg void OnTimer(UINT nIDEvent);
	afx_msg void OnPaint();
	virtual BOOL PreTranslateMessage(MSG* pMsg);
protected:
	virtual BOOL OnWndMsg(UINT message, WPARAM wParam, LPARAM lParam, LRESULT* pResult);
public:
	afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);
	afx_msg void OnMouseMove(UINT nFlags, CPoint point);
	afx_msg BOOL OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message);
	afx_msg BOOL OnEraseBkgnd(CDC* pDC);
};

// GoGoStatic.cpp : 实现文件
//

#include "stdafx.h"
#include ".\gogostatic.h"

#define ID_TIMER_GOGO 888888
#define ID_TIMER_MOUSELEAVED 888889

// CGoGoStatic

IMPLEMENT_DYNAMIC(CGoGoStatic, CStatic)
CGoGoStatic::CGoGoStatic()
: m_ptStart(0)
, m_szText(0)
, m_bIsGoing(FALSE)
{
}

CGoGoStatic::~CGoGoStatic()
{
}


BEGIN_MESSAGE_MAP(CGoGoStatic, CStatic)
	ON_WM_TIMER()
	ON_WM_PAINT()
	ON_WM_CREATE()
	ON_WM_MOUSEMOVE()
	ON_WM_SETCURSOR()
	ON_WM_ERASEBKGND()
END_MESSAGE_MAP()



// CGoGoStatic 消息处理程序

void CGoGoStatic::OnPaint()
{
	CPaintDC dc(this); // device context for painting
	CString strText;
	GetWindowText(strText);
	CRect rtClient;
	GetClientRect(&rtClient);
	CRgn rgnClip;
	rgnClip.CreateRectRgn(rtClient.left, rtClient.top, rtClient.right, rtClient.bottom);
	dc.SelectClipRgn(&rgnClip);
	int nOldBkMode = dc.SetBkMode(TRANSPARENT);
	CGdiObject* pOldObj = dc.SelectStockObject(DEFAULT_GUI_FONT);
	m_szText = dc.GetTextExtent(strText);
	dc.TextOut(m_ptStart.x, m_ptStart.y, strText);
	dc.SelectObject(pOldObj);
	dc.SetBkMode(nOldBkMode);
	dc.SelectClipRgn(NULL);
}

void CGoGoStatic::OnTimer(UINT nIDEvent)
{
	// TODO: 在此添加消息处理程序代码和/或调用默认值
	if ( nIDEvent == ID_TIMER_GOGO )
	{
		m_ptStart.x -= 2;

		CRect rtClient;
		GetClientRect(&rtClient);
		rtClient.NormalizeRect();
		if ( m_ptStart.x+m_szText.cx < rtClient.left )
			m_ptStart.x = rtClient.right - 2;

		ShowWindow(SW_HIDE);
		ShowWindow(SW_NORMAL);
	}
	if ( nIDEvent == ID_TIMER_MOUSELEAVED )
	{
		CPoint pt;
		::GetCursorPos(&pt);
		ScreenToClient(&pt);
		CRect rtClient;
		GetClientRect(&rtClient);
		rtClient.NormalizeRect();
		if (!rtClient.PtInRect(pt))
		{
			GoGo();
			KillTimer(ID_TIMER_MOUSELEAVED);
		}
	}

	CStatic::OnTimer(nIDEvent);
}

BOOL CGoGoStatic::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message)
{
	CPoint pt;
	::GetCursorPos(&pt);
	ScreenToClient(&pt);
	CRect rectText(m_ptStart.x, m_ptStart.y, m_szText.cx, m_szText.cy);
	rectText.NormalizeRect();
	if (rectText.PtInRect(pt))
	{
		AfxGetApp()->LoadStandardCursor(IDC_CROSS);
		return TRUE;
	}

	return CStatic::OnSetCursor(pWnd, nHitTest, message);
}

void CGoGoStatic::GoGo()
{
	KillTimer(ID_TIMER_GOGO);
	SetTimer(ID_TIMER_GOGO, 100, NULL);
	m_bIsGoing = TRUE;
}

void CGoGoStatic::Stop()
{
	KillTimer(ID_TIMER_GOGO);
	m_bIsGoing = FALSE;
}

void CGoGoStatic::EndGoGo()
{
	KillTimer(ID_TIMER_GOGO);
	m_ptStart = 0;
	m_bIsGoing = FALSE;
	ShowWindow(SW_HIDE);
	ShowWindow(SW_NORMAL);
}

BOOL CGoGoStatic::PreTranslateMessage(MSG* pMsg)
{
	if (pMsg->hwnd == m_hWnd)
	{
		switch(pMsg->message)
		{
		case WM_MOUSEHOVER:
			{
				Stop();
				break;
			}
		case WM_MOUSELEAVE:
			{
				GoGo();
				break;
			}
		case WM_LBUTTONDOWN:
			{
				//GoGo();
				break;
			}
		default:break;
		}
	}


	return CStatic::PreTranslateMessage(pMsg);
}

BOOL CGoGoStatic::OnWndMsg(UINT message, WPARAM wParam, LPARAM lParam, LRESULT* pResult)
{
	// TODO: 在此添加专用代码和/或调用基类
	switch(message)
	{
	case WM_MOUSEHOVER:
		{
			Stop();
			break;
		}
	case WM_MOUSELEAVE:
		{
			GoGo();
			break;
		}
	case WM_LBUTTONDOWN:
		{
			//GoGo();
			break;
		}
	default:break;
	}
	return CStatic::OnWndMsg(message, wParam, lParam, pResult);
}

int CGoGoStatic::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
	if (CStatic::OnCreate(lpCreateStruct) == -1)
		return -1;

	// TODO:  在此添加您专用的创建代码

	return 0;
}

void CGoGoStatic::OnMouseMove(UINT nFlags, CPoint point)
{
	// TODO: 在此添加消息处理程序代码和/或调用默认值
	if (m_bIsGoing)
	{
		Stop();
		SetTimer(ID_TIMER_MOUSELEAVED, 500, NULL);
	}

	CStatic::OnMouseMove(nFlags, point);
}
BOOL CGoGoStatic::OnEraseBkgnd(CDC* pDC)
{
	// TODO: 在此添加消息处理程序代码和/或调用默认值
	return TRUE;
}