// 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.
//
// 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.

#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()
// 
// Constructor, give the variables their initial values
//////////////////////////////////////////////////////////////////////
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_bAdjustToFit      = TRUE;              //resize the window to fit the text?
	m_strURL.Empty();
}

//////////////////////////////////////////////////////////////////////
// CHyperLink::~CHyperLink()
// 
// Destructor, delete our font
//////////////////////////////////////////////////////////////////////
CHyperLink::~CHyperLink()
{

  //delete our font, if we have used it
	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) 
// 
// 
//////////////////////////////////////////////////////////////////////
BOOL CHyperLink::PreTranslateMessage( MSG* pMsg) 
{

  //pass a mouse message to our tool tip control for processing
	m_ToolTip.RelayEvent( pMsg);

  //default handling of messages
	return CStatic::PreTranslateMessage( pMsg);
}

//////////////////////////////////////////////////////////////////////
// HBRUSH CHyperLink::CtlColor(CDC* pDC, UINT nCtlColor) 
// 
// 
//////////////////////////////////////////////////////////////////////
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) 
// 
// 
//////////////////////////////////////////////////////////////////////
BOOL CHyperLink::OnSetCursor( CWnd* pWnd, UINT nHitTest, UINT message) 
{

	::SetCursor( m_hLinkCursor);
	return TRUE;
}

//////////////////////////////////////////////////////////////////////
// void CHyperLink::PreSubclassWindow() 
// 
// 
//////////////////////////////////////////////////////////////////////
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())
  {

    //window and URL both empty. DUH!
		ASSERT( !m_strURL.IsEmpty());
		SetWindowText( m_strURL);
	}

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

	//load up the (standard) 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)
// 
// 
//////////////////////////////////////////////////////////////////////
void CHyperLink::SetURL( CString strURL)
{
	m_strURL = strURL;
	PositionWindow();
	m_ToolTip.UpdateTipText( strURL, this, TOOLTIP_ID);
}

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

//////////////////////////////////////////////////////////////////////
// void CHyperLink::SetVisited( BOOL bVisited /* = TRUE */) 
// 
// Link has been visited, mark the link
//////////////////////////////////////////////////////////////////////
void CHyperLink::SetVisited( BOOL bVisited /* = TRUE */) 
{ 

	m_bVisited = bVisited; 
	Invalidate(); 
}

//////////////////////////////////////////////////////////////////////
// void CHyperLink::SetUnderline(BOOL bUnderline /* = TRUE */)
// 
// Set link text to be underlined or not
//////////////////////////////////////////////////////////////////////
void CHyperLink::SetUnderline( BOOL bUnderline /* = TRUE */)
{

	m_bUnderline = bUnderline; 
	Invalidate(); 
}

//////////////////////////////////////////////////////////////////////
// void CHyperLink::SetAutoSize( BOOL bAutoSize /* = TRUE */)
// 
// Property autosizing, set to true or false
//////////////////////////////////////////////////////////////////////
void CHyperLink::SetAutoSize( BOOL bAutoSize /* = TRUE */)
{

	m_bAdjustToFit = bAutoSize;
	PositionWindow();
}

//////////////////////////////////////////////////////////////////////
// void CHyperLink::PositionWindow()
// 
// 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 (!m_bAdjustToFit) return;

	//get the current window position
	CRect rect;
	GetWindowRect( rect);

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

	//get the size of the window text
	CString strWndText;
	GetWindowText(strWndText);

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

	// 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)
		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;
  }

	// Move the window
	SetWindowPos( NULL, rect.left, rect.top, rect.Width(), 
                rect.Height(), SWP_NOZORDER);
}

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

//////////////////////////////////////////////////////////////////////
// void CHyperLink::OnClicked()
// 
// Hyperlink has been clicked by user
//////////////////////////////////////////////////////////////////////
void CHyperLink::OnClicked()
{

  //visit URL
	int result = (int)GotoURL( m_strURL, SW_SHOW);

  //check if URL has been visited
	m_bVisited = (result > HINSTANCE_ERROR);

  //something went wrong...
	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)
// 
// 
//////////////////////////////////////////////////////////////////////
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)
// 
// report error to use, error strings are defined inside the function
// and are not language dependent
//////////////////////////////////////////////////////////////////////
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;
	}

  //add some explanation
	str = "Unable to open hyperlink:\n\n" + str;

  //use a standard messagebox to display the message
	AfxMessageBox( str, MB_ICONEXCLAMATION | MB_OK);
}

//#ifdef  __cplusplus
//extern "C" {
//#endif

  //char *strstr( const char *string, const char *strCharSet );
  //unsigned char *_mbsstr( const unsigned char *string, const unsigned char *strCharSet );


//#ifdef  __cplusplus
//}
//#endif


//////////////////////////////////////////////////////////////////////
// HINSTANCE CHyperLink::GotoURL( LPCTSTR url, int showcmd)
// 
// Go to an URL, uses ShellExecute to get IE running
// ShellExecute opens or prints a specified file
//////////////////////////////////////////////////////////////////////
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);

        //run the specified application
				result = (HINSTANCE) WinExec( key,showcmd);
			}
		}
	}

	return result;
}