ContactBook/HyperLink.cpp

// HyperLink.cpp : implementation file
//
// HyperLink static control. Will open the default browser with the given URL
// when the user clicks on the link.
//
// Copyright Chris Maunder, 1997
// Feel free to use and distribute.
//
// "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,

#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_crLinkColour	  = RGB(0, 0, 238);		// Blue
	m_crVisitedColour = RGB(85, 26, 139);	// Purple
	m_bVisited		  = FALSE;				// Hasn't been visited yet.
	m_bUnderline	  = TRUE;				// Underline the link?
	m_strURL.Empty();
}

CHyperLink::~CHyperLink()
{
	if ((HFONT)m_Font)
		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()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CHyperLink message handlers

BOOL CHyperLink::PreTranslateMessage(MSG* pMsg) 
{
	m_ToolTip.RelayEvent(pMsg);
	return CStatic::PreTranslateMessage(pMsg);
}

HBRUSH CHyperLink::CtlColor(CDC* pDC, UINT nCtlColor) 
{
	ASSERT(nCtlColor == CTLCOLOR_STATIC);

	// Set the approriate colour
	if (m_bVisited)
		pDC->SetTextColor(m_crVisitedColour);
	else
		pDC->SetTextColor(m_crLinkColour);

	// Set underline font if required
	if (m_bUnderline) {

		if (!(HFONT)m_Font) {			// Create font only once.
			LOGFONT lf;
			GetFont()->GetLogFont(&lf);
			lf.lfUnderline = TRUE;
			m_Font.CreateFontIndirect(&lf);
		}

		pDC->SelectObject(&m_Font);
	}

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

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

void CHyperLink::PreSubclassWindow() 
{
	// We want to get mouse clicks via STN_CLICKED
	DWORD dwStyle = GetStyle();
	::SetWindowLong(m_hWnd, 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);
	}

	PositionWindow();		// Adjust size of window to fit URL if necessary

	// Load up the hyperlink cursor
	m_hLinkCursor = AfxGetApp()->LoadStandardCursor(IDC_ARROW);

	// Create the tooltip
	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;
	PositionWindow();
	m_ToolTip.UpdateTipText(strURL, this, TOOLTIP_ID);
}

void CHyperLink::SetColours(COLORREF crLinkColour, COLORREF crVisitedColour) 
{ 
	m_crLinkColour    = crLinkColour; 
	m_crVisitedColour = crVisitedColour; 
	Invalidate(); 
}

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

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

void CHyperLink::SetAutoSize(BOOL bAutoSize /* = TRUE */)
{
	m_bAdjustToFit = bAutoSize;
	PositionWindow();
}

void CHyperLink::PositionWindow()
{
	if (!m_bAdjustToFit) return;

	CRect rect;
	GetWindowRect(rect);

	CString strWndText;
	GetWindowText(strWndText);

	CWnd* pParent = GetParent();
	if (pParent)
		pParent->ScreenToClient(rect);

	CDC* pDC = GetDC();
	CSize Extent = pDC->GetTextExtent(strWndText);
	ReleaseDC(pDC);

	DWORD dwStyle = GetStyle();

	if (dwStyle & SS_CENTERIMAGE)
		rect.DeflateRect(0, (rect.Height() - Extent.cy)/2);
	else
		rect.bottom = rect.top + Extent.cy;

	if (dwStyle & SS_CENTER)   
		rect.DeflateRect((rect.Width() - Extent.cx)/2, 0);
	else if (dwStyle & SS_RIGHT) 
		rect.left  = rect.right - Extent.cx;
	else // SS_LEFT = 0, so we can't test for it explicitly 
		rect.right = rect.left + Extent.cx;

	SetWindowPos(NULL, rect.left, rect.top, rect.Width(), rect.Height(), SWP_NOZORDER);
}

/////////////////////////////////////////////////////////////////////////////
// CHyperLink implementation

void CHyperLink::OnClicked()
{
	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
}

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("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 = strstr(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);
				result = (HINSTANCE) WinExec(key,showcmd);
            }
        }
	}

    return result;
}