hyperlink.cpp

C++编程实践与技巧一书各章节的源码

// HyperLink.cpp : implementation file
//

#include "stdafx.h"
#include "HyperLink.h"

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

#define TOOLTIP_ID 1

/////////////////////////////////////////////////////////////////////////////
// CHyperLink

CHyperLink::CHyperLink()
{
    m_hLinkCursor       = NULL;                 // 不使用光标
    m_crLinkColour      = RGB(  0,   0, 238);   // 兰色
    m_crVisitedColour   = RGB( 85,  26, 139);   // 紫色
    m_crHoverColour     = ::GetSysColor(COLOR_HIGHLIGHT);
    m_bOverControl      = FALSE;                //无光标
    m_bVisited          = FALSE;                // 没有使用过
    m_bUnderline        = TRUE;                 // 是否在超级连接下有下划线
    m_strURL.Empty();
}

CHyperLink::~CHyperLink()
{
    m_Font.DeleteObject();
}

BEGIN_MESSAGE_MAP(CHyperLink, CStatic)
    //{{AFX_MSG_MAP(CHyperLink)
    ON_CONTROL_REFLECT(STN_CLICKED, OnClicked)
    ON_WM_CTLCOLOR_REFLECT()
    ON_WM_SETCURSOR()
    ON_WM_MOUSEMOVE()
    //}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CHyperLink message handlers
//消息转发
BOOL CHyperLink::PreTranslateMessage(MSG* pMsg) 
{
    m_ToolTip.RelayEvent(pMsg);
    return CStatic::PreTranslateMessage(pMsg);
}
//单击超级连接时的事件响应函数
void CHyperLink::OnClicked()
{
    int result = (int)GotoURL(m_strURL, SW_SHOW);
    m_bVisited = (result > HINSTANCE_ERROR);
    if (!m_bVisited) {
        MessageBeep(MB_ICONEXCLAMATION);     // 不能执行超级连接
    } else 
        SetVisited();                        //  重绘超级连接中参观过的颜色
}

//更新超级连接控件颜色
HBRUSH CHyperLink::CtlColor(CDC* pDC, UINT nCtlColor) 
{
    ASSERT(nCtlColor == CTLCOLOR_STATIC);

    if (m_bOverControl)
        pDC->SetTextColor(m_crHoverColour);
    else if (m_bVisited)
        pDC->SetTextColor(m_crVisitedColour);
    else
        pDC->SetTextColor(m_crLinkColour);

    // transparent text.
    pDC->SetBkMode(TRANSPARENT);
    return (HBRUSH)GetStockObject(NULL_BRUSH);
}

//当鼠标在超级连接控件上移动时的时间处理函数
void CHyperLink::OnMouseMove(UINT nFlags, CPoint point) 
{
    CStatic::OnMouseMove(nFlags, point);

    if (m_bOverControl)        // 光标目前在超级连接控件之上
    {
        CRect rect;
        GetClientRect(rect);

        if (!rect.PtInRect(point))
        {
            m_bOverControl = FALSE;
            ReleaseCapture();
            RedrawWindow();
            return;
        }
    }
    else                      // 光标移过超级连接控件
    {
        m_bOverControl = TRUE;
        RedrawWindow();
        SetCapture();
    }
}

//设置光标
BOOL CHyperLink::OnSetCursor(CWnd* /*pWnd*/, UINT /*nHitTest*/, UINT /*message*/) 
{
    if (m_hLinkCursor)
    {
        ::SetCursor(m_hLinkCursor);
        return TRUE;
    }
    return FALSE;
}


void CHyperLink::PreSubclassWindow() 
{
    
    DWORD dwStyle = GetStyle();
    ::SetWindowLong(GetSafeHwnd(), GWL_STYLE, dwStyle | SS_NOTIFY);
    
    if (m_strURL.IsEmpty())
        GetWindowText(m_strURL);

    CString strWndText;
    GetWindowText(strWndText);
    if (strWndText.IsEmpty()) {
        ASSERT(!m_strURL.IsEmpty());   
        SetWindowText(m_strURL);
    }

    // 创建字体
    LOGFONT lf;
    GetFont()->GetLogFont(&lf);
    lf.lfUnderline = m_bUnderline;
    m_Font.CreateFontIndirect(&lf);
    SetFont(&m_Font);

    //PositionWindow();        // Adjust size of window to fit URL if necessary
    SetDefaultCursor();      // Try and load up a "hand" cursor

    // 创建控件提示
    CRect rect; 
    GetClientRect(rect);
    m_ToolTip.Create(this);
    m_ToolTip.AddTool(this, m_strURL, rect, TOOLTIP_ID);

    CStatic::PreSubclassWindow();
}

/////////////////////////////////////////////////////////////////////////////
// CHyperLink operations

void CHyperLink::SetURL(CString strURL)
{
    m_strURL = strURL;

    if (::IsWindow(GetSafeHwnd())) {
        m_ToolTip.UpdateTipText(strURL, this, TOOLTIP_ID);
    }
}

CString CHyperLink::GetURL() const
{ 
    return m_strURL;   
}

void CHyperLink::SetColours(COLORREF crLinkColour, COLORREF crVisitedColour,
                            COLORREF crHoverColour /* = -1 */) 
{ 
    m_crLinkColour    = crLinkColour; 
    m_crVisitedColour = crVisitedColour;

	if (crHoverColour == -1)
		m_crHoverColour = ::GetSysColor(COLOR_HIGHLIGHT);
	else
		m_crHoverColour = crHoverColour;

    if (::IsWindow(m_hWnd))
        Invalidate(); 
}

COLORREF CHyperLink::GetLinkColour() const
{ 
    return m_crLinkColour; 
}

COLORREF CHyperLink::GetVisitedColour() const
{
    return m_crVisitedColour; 
}

COLORREF CHyperLink::GetHoverColour() const
{
    return m_crHoverColour;
}

void CHyperLink::SetVisited(BOOL bVisited /* = TRUE */) 
{ 
    m_bVisited = bVisited; 

    if (::IsWindow(GetSafeHwnd()))
        Invalidate(); 
}

BOOL CHyperLink::GetVisited() const
{ 
    return m_bVisited; 
}

void CHyperLink::SetLinkCursor(HCURSOR hCursor)
{ 
    m_hLinkCursor = hCursor;
    if (m_hLinkCursor == NULL)
        SetDefaultCursor();
}

HCURSOR CHyperLink::GetLinkCursor() const
{
    return m_hLinkCursor;
}

void CHyperLink::SetUnderline(BOOL bUnderline /* = TRUE */)
{
    m_bUnderline = bUnderline;

    if (::IsWindow(GetSafeHwnd()))
    {
        LOGFONT lf;
        GetFont()->GetLogFont(&lf);
        lf.lfUnderline = m_bUnderline;

        m_Font.DeleteObject();
        m_Font.CreateFontIndirect(&lf);
        SetFont(&m_Font);

        Invalidate(); 
    }
}

BOOL CHyperLink::GetUnderline() const
{ 
    return m_bUnderline; 
}

/////////////////////////////////////////////////////////////////////////////
// CHyperLink implementation
//设置默认光标，从winhlp32.exe文件中获取光标
void CHyperLink::SetDefaultCursor()
{
    if (m_hLinkCursor == NULL)                
    {
        // 获取Windows目录
        CString strWndDir;
        GetWindowsDirectory(strWndDir.GetBuffer(MAX_PATH), MAX_PATH);
        strWndDir.ReleaseBuffer();

        strWndDir += _T("\\winhlp32.exe");
        // 从winhlp32.exe中接收106#光标，是个手形光标
        HMODULE hModule = LoadLibrary(strWndDir);
        if (hModule) {
            HCURSOR hHandCursor = ::LoadCursor(hModule, MAKEINTRESOURCE(106));
            if (hHandCursor)
                m_hLinkCursor = CopyCursor(hHandCursor);
        }
        FreeLibrary(hModule);
    }
}


HINSTANCE CHyperLink::GotoURL(LPCTSTR url, int showcmd)
{
    TCHAR key[MAX_PATH + MAX_PATH];

    // 试图使用ShellExecute()函数打开指定的url
    HINSTANCE result = ShellExecute(NULL, _T("open"), url, NULL,NULL, showcmd);

    // 如果打开失败，则使用htmlfile键来获取打开该文件的程序
    if ((UINT)result <= HINSTANCE_ERROR) {

        if (GetRegKey(HKEY_CLASSES_ROOT, _T("htmlfile"), key) == ERROR_SUCCESS) {
            lstrcat(key, _T("\\shell\\open\\command"));
			//去掉程序中的参数
            if (GetRegKey(HKEY_CLASSES_ROOT,key,key) == ERROR_SUCCESS) {
                TCHAR *pos;
                pos = _tcsstr(key, _T("\"%1\""));
                if (pos == NULL) {               
                    pos = strstr(key, _T("%1")); 
                    if (pos == NULL)                   // 程序没有参数
                        pos = key+lstrlen(key)-1;
                    else
                        *pos = '\0';                   // 删除参数
                }
                else
                    *pos = '\0';                       // 删除参数

                lstrcat(pos, _T(" "));//程序后面加一个空格
                lstrcat(pos, url);
				//打开指定的URL
                result = (HINSTANCE) WinExec(key,showcmd);
            }
        }
    }

    return result;
}
//读取注册表中某一主键的子键值
LONG CHyperLink::GetRegKey(HKEY key, LPCTSTR subkey, LPTSTR retdata)
{
    HKEY hkey;
    LONG retval = RegOpenKeyEx(key, subkey, 0, KEY_QUERY_VALUE, &hkey);

    if (retval == ERROR_SUCCESS) {
        long datasize = MAX_PATH;
        TCHAR data[MAX_PATH];
        RegQueryValue(hkey, NULL, data, &datasize);
        lstrcpy(retdata,data);
        RegCloseKey(hkey);
    }

    return retval;
}