www.pudn.com > skinscrollbar_demo.zip > hyperlink.cpp, change:2006-12-22,size:14638b


// HyperLink.cpp : implementation file 
// 
// HyperLink static control. Will open the default browser with the given URL 
// when the user clicks on the link. 
// 
// Copyright (C) 1997 - 1999 Chris Maunder 
// All rights reserved. May not be sold for profit. 
// 
// Thanks to Pål K. Tønder for auto-size and window caption changes. 
// 
// "GotoURL" function by Stuart Patterson 
// As seen in the August, 1997 Windows Developer's Journal. 
// Copyright 1997 by Miller Freeman, Inc. All rights reserved. 
// Modified by Chris Maunder to use TCHARs instead of chars. 
// 
// "Default hand cursor" from Paul DiLascia's Jan 1998 MSJ article. 
// 
// 2/29/00 -- P. Shaffer standard font mod. 
 
#include "stdafx.h" 
#include "HyperLink.h" 
 
#include "atlconv.h"    // for Unicode conversion - requires #include <afxdisp.h> // MFC OLE automation classes 
 
#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;                 // No cursor as yet 
    m_crLinkColour      = RGB(  0,   0, 238);   // Blue 
    m_crVisitedColour   = RGB( 85,  26, 139);   // Purple 
    m_crHoverColour     = RGB(255,   0,   0);   // Red 
    m_bOverControl      = FALSE;                // Cursor not yet over control 
    m_bVisited          = FALSE;                // Hasn't been visited yet. 
    m_nUnderline        = ulHover;              // Underline the link? 
    m_bAdjustToFit      = TRUE;                 // Resize the window to fit the text? 
    m_strURL.Empty(); 
    m_nTimerID          = 100; 
} 
 
CHyperLink::~CHyperLink() 
{ 
    m_UnderlineFont.DeleteObject(); 
} 
 
///////////////////////////////////////////////////////////////////////////// 
// CHyperLink overrides 
 
BOOL CHyperLink::DestroyWindow()  
{ 
    KillTimer(m_nTimerID); 
	 
	return CStatic::DestroyWindow(); 
} 
 
BOOL CHyperLink::PreTranslateMessage(MSG* pMsg)  
{ 
    m_ToolTip.RelayEvent(pMsg); 
    return CStatic::PreTranslateMessage(pMsg); 
} 
 
 
void CHyperLink::PreSubclassWindow()  
{ 
    // We want to get mouse clicks via STN_CLICKED 
    DWORD dwStyle = GetStyle(); 
    ::SetWindowLong(GetSafeHwnd(), GWL_STYLE, dwStyle | SS_NOTIFY); 
     
    // Set the URL as the window text 
    if (m_strURL.IsEmpty()) 
        GetWindowText(m_strURL); 
 
    // Check that the window text isn't empty. If it is, set it as the URL. 
    CString strWndText; 
    GetWindowText(strWndText); 
    if (strWndText.IsEmpty())  
    { 
        ASSERT(!m_strURL.IsEmpty());    // Window and URL both NULL. DUH! 
        SetWindowText(m_strURL); 
    } 
 
	CFont* pFont = GetFont(); 
	if (!pFont) 
	{ 
		HFONT hFont = (HFONT)GetStockObject(DEFAULT_GUI_FONT); 
		if (hFont == NULL) 
			hFont = (HFONT) GetStockObject(ANSI_VAR_FONT); 
		if (hFont) 
			pFont = CFont::FromHandle(hFont); 
	} 
	ASSERT(pFont->GetSafeHandle()); 
 
    // Create the underline font 
    LOGFONT lf; 
    pFont->GetLogFont(&lf); 
	m_StdFont.CreateFontIndirect(&lf); 
    lf.lfUnderline = (BYTE) TRUE; 
    m_UnderlineFont.CreateFontIndirect(&lf); 
 
    PositionWindow();        // Adjust size of window to fit URL if necessary 
    SetDefaultCursor();      // Try and load up a "hand" cursor 
    SetUnderline(); 
 
    // Create the tooltip 
    CRect rect;  
    GetClientRect(rect); 
    m_ToolTip.Create(this); 
    m_ToolTip.AddTool(this, m_strURL, rect, TOOLTIP_ID); 
 
    CStatic::PreSubclassWindow(); 
} 
 
BEGIN_MESSAGE_MAP(CHyperLink, CStatic) 
    //{{AFX_MSG_MAP(CHyperLink) 
    ON_WM_CTLCOLOR_REFLECT() 
    ON_WM_SETCURSOR() 
    ON_WM_MOUSEMOVE() 
	ON_WM_TIMER() 
    ON_CONTROL_REFLECT(STN_CLICKED, OnClicked) 
	ON_WM_ERASEBKGND() 
	//}}AFX_MSG_MAP 
END_MESSAGE_MAP() 
 
///////////////////////////////////////////////////////////////////////////// 
// CHyperLink message handlers 
 
void CHyperLink::OnClicked() 
{ 
    m_bOverControl = FALSE; 
	int result = (int)GotoURL(m_strURL, SW_SHOW); 
	m_bVisited = (result > HINSTANCE_ERROR); 
    if (!m_bVisited) 
    { 
        MessageBeep(MB_ICONEXCLAMATION);     // Unable to follow link 
        ReportError(result); 
    } 
    else  
        SetVisited();                        // Repaint to show visited colour 
} 
 
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); 
} 
 
void CHyperLink::OnMouseMove(UINT nFlags, CPoint point)  
{ 
    if (!m_bOverControl)        // Cursor has just moved over control 
    { 
        m_bOverControl = TRUE; 
 
        if (m_nUnderline == ulHover) 
            SetFont(&m_UnderlineFont); 
        Invalidate(); 
 
        SetTimer(m_nTimerID, 100, NULL); 
    } 
    CStatic::OnMouseMove(nFlags, point); 
} 
 
void CHyperLink::OnTimer(UINT nIDEvent)  
{ 
    CPoint p(GetMessagePos()); 
    ScreenToClient(&p); 
 
    CRect rect; 
    GetClientRect(rect); 
    if (!rect.PtInRect(p)) 
    { 
        m_bOverControl = FALSE; 
        KillTimer(m_nTimerID); 
 
        if (m_nUnderline != ulAlways) 
            SetFont(&m_StdFont); 
        rect.bottom+=10; 
        InvalidateRect(rect); 
    } 
     
	CStatic::OnTimer(nIDEvent); 
} 
 
BOOL CHyperLink::OnSetCursor(CWnd* /*pWnd*/, UINT /*nHitTest*/, UINT /*message*/)  
{ 
    if (m_hLinkCursor) 
    { 
        ::SetCursor(m_hLinkCursor); 
        return TRUE; 
    } 
    return FALSE; 
} 
 
BOOL CHyperLink::OnEraseBkgnd(CDC* pDC)  
{ 
    CRect rect; 
    GetClientRect(rect); 
    pDC->FillSolidRect(rect, ::GetSysColor(COLOR_3DFACE)); 
 
    return TRUE; 
} 
 
///////////////////////////////////////////////////////////////////////////// 
// CHyperLink operations 
 
void CHyperLink::SetURL(CString strURL) 
{ 
    m_strURL = strURL; 
 
    if (::IsWindow(GetSafeHwnd())) { 
        PositionWindow(); 
        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(int nUnderline /*=ulHover*/) 
{ 
    if (m_nUnderline == nUnderline) 
        return; 
 
    if (::IsWindow(GetSafeHwnd())) 
    { 
        if (nUnderline == ulAlways) 
            SetFont(&m_UnderlineFont); 
        else 
            SetFont(&m_StdFont); 
 
        Invalidate();  
    } 
 
    m_nUnderline = nUnderline; 
} 
 
int CHyperLink::GetUnderline() const 
{  
    return m_nUnderline;  
} 
 
void CHyperLink::SetAutoSize(BOOL bAutoSize /* = TRUE */) 
{ 
    m_bAdjustToFit = bAutoSize; 
 
    if (::IsWindow(GetSafeHwnd())) 
        PositionWindow(); 
} 
 
BOOL CHyperLink::GetAutoSize() const 
{  
    return m_bAdjustToFit;  
} 
 
 
// Move and resize the window so that the window is the same size 
// as the hyperlink text. This stops the hyperlink cursor being active 
// when it is not directly over the text. If the text is left justified 
// then the window is merely shrunk, but if it is centred or right 
// justified then the window will have to be moved as well. 
// 
// Suggested by Pål K. Tønder  
 
void CHyperLink::PositionWindow() 
{ 
    if (!::IsWindow(GetSafeHwnd()) || !m_bAdjustToFit)  
        return; 
 
    // Get the current window position 
    CRect WndRect, ClientRect; 
    GetWindowRect(WndRect); 
    GetClientRect(ClientRect); 
 
    ClientToScreen(ClientRect); 
 
    CWnd* pParent = GetParent(); 
    if (pParent) 
    { 
        pParent->ScreenToClient(WndRect); 
        pParent->ScreenToClient(ClientRect); 
    } 
 
    // Get the size of the window text 
    CString strWndText; 
    GetWindowText(strWndText); 
 
    CDC* pDC = GetDC(); 
    CFont* pOldFont = pDC->SelectObject(&m_UnderlineFont); 
    CSize Extent = pDC->GetTextExtent(strWndText); 
    pDC->SelectObject(pOldFont); 
    ReleaseDC(pDC); 
 
    // Adjust for window borders 
    Extent.cx += WndRect.Width() - ClientRect.Width();  
    Extent.cy += WndRect.Height() - ClientRect.Height();  
 
    // Get the text justification via the window style 
    DWORD dwStyle = GetStyle(); 
 
    // Recalc the window size and position based on the text justification 
    if (dwStyle & SS_CENTERIMAGE) 
        WndRect.DeflateRect(0, (WndRect.Height() - Extent.cy)/2); 
    else 
        WndRect.bottom = WndRect.top + Extent.cy; 
 
    if (dwStyle & SS_CENTER)    
        WndRect.DeflateRect((WndRect.Width() - Extent.cx)/2, 0); 
    else if (dwStyle & SS_RIGHT)  
        WndRect.left  = WndRect.right - Extent.cx; 
    else // SS_LEFT = 0, so we can't test for it explicitly  
        WndRect.right = WndRect.left + Extent.cx; 
 
    // Move the window 
    SetWindowPos(NULL, WndRect.left, WndRect.top, WndRect.Width(), WndRect.Height(), SWP_NOZORDER); 
} 
 
///////////////////////////////////////////////////////////////////////////// 
// CHyperLink implementation 
 
// The following appeared in Paul DiLascia's Jan 1998 MSJ articles. 
// It loads a "hand" cursor from the winhlp32.exe module 
void CHyperLink::SetDefaultCursor() 
{ 
    if (m_hLinkCursor == NULL)                // No cursor handle - load our own 
    { 
        // Get the windows directory 
        CString strWndDir; 
        GetWindowsDirectory(strWndDir.GetBuffer(MAX_PATH), MAX_PATH); 
        strWndDir.ReleaseBuffer(); 
 
        strWndDir += _T("\\winhlp32.exe"); 
        // This retrieves cursor #106 from winhlp32.exe, which is a hand pointer 
        HMODULE hModule = LoadLibrary(strWndDir); 
        if (hModule) { 
            HCURSOR hHandCursor = ::LoadCursor(hModule, MAKEINTRESOURCE(106)); 
            if (hHandCursor) 
                m_hLinkCursor = CopyCursor(hHandCursor); 
        } 
        FreeLibrary(hModule); 
    } 
} 
 
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; 
} 
 
void CHyperLink::ReportError(int nError) 
{ 
    CString str; 
    switch (nError) { 
        case 0:                       str = "The operating system is out\nof memory or resources."; break; 
        case SE_ERR_PNF:              str = "The specified path was not found."; break; 
        case SE_ERR_FNF:              str = "The specified file was not found."; break; 
        case ERROR_BAD_FORMAT:        str = "The .EXE file is invalid\n(non-Win32 .EXE or error in .EXE image)."; break; 
        case SE_ERR_ACCESSDENIED:     str = "The operating system denied\naccess to the specified file."; break; 
        case SE_ERR_ASSOCINCOMPLETE:  str = "The filename association is\nincomplete or invalid."; break; 
        case SE_ERR_DDEBUSY:          str = "The DDE transaction could not\nbe completed because other DDE transactions\nwere being processed."; break; 
        case SE_ERR_DDEFAIL:          str = "The DDE transaction failed."; break; 
        case SE_ERR_DDETIMEOUT:       str = "The DDE transaction could not\nbe completed because the request timed out."; break; 
        case SE_ERR_DLLNOTFOUND:      str = "The specified dynamic-link library was not found."; break; 
        case SE_ERR_NOASSOC:          str = "There is no application associated\nwith the given filename extension."; break; 
        case SE_ERR_OOM:              str = "There was not enough memory to complete the operation."; break; 
        case SE_ERR_SHARE:            str = "A sharing violation occurred. "; 
        default:                      str.Format(_T("Unknown Error (%d) occurred."), nError); break; 
    } 
    str = "Unable to open hyperlink:\n\n" + str; 
    AfxMessageBox(str, MB_ICONEXCLAMATION | MB_OK); 
} 
 
HINSTANCE CHyperLink::GotoURL(LPCTSTR url, int showcmd) 
{ 
    TCHAR key[MAX_PATH + MAX_PATH]; 
 
    // First try ShellExecute() 
    HINSTANCE result = ShellExecute(NULL, _T("open"), url, NULL,NULL, showcmd); 
 
    // If it failed, get the .htm regkey and lookup the program 
    if ((UINT)result <= HINSTANCE_ERROR) { 
 
        if (GetRegKey(HKEY_CLASSES_ROOT, _T(".htm"), key) == ERROR_SUCCESS) { 
            lstrcat(key, _T("\\shell\\open\\command")); 
 
            if (GetRegKey(HKEY_CLASSES_ROOT,key,key) == ERROR_SUCCESS) { 
                TCHAR *pos; 
                pos = _tcsstr(key, _T("\"%1\"")); 
                if (pos == NULL) {                     // No quotes found 
                    pos = _tcsstr(key, _T("%1"));      // Check for %1, without quotes  
                    if (pos == NULL)                   // No parameter at all... 
                        pos = key+lstrlen(key)-1; 
                    else 
                        *pos = '\0';                   // Remove the parameter 
                } 
                else 
                    *pos = '\0';                       // Remove the parameter 
 
                lstrcat(pos, _T(" ")); 
                lstrcat(pos, url); 
 
                USES_CONVERSION; 
                result = (HINSTANCE) WinExec(T2A(key),showcmd); 
            } 
        } 
    } 
 
    return result; 
}