// 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, 1998 Chris Maunder (chrismaunder@codeguru.com)
// All rights reserved. May not be sold for profit.
//
// Thanks to P�l K. T�nder 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.
//
#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
BEGIN_MESSAGE_MAP(CHyperLink, CStatic)
//{{AFX_MSG_MAP(CHyperLink)
ON_CONTROL_REFLECT(STN_CLICKED, OnClicked)
ON_WM_CTLCOLOR_REFLECT()
ON_WM_TIMER()
ON_WM_SETCURSOR()
ON_WM_DESTROY()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CHyperLink
CHyperLink::CHyperLink()
{
m_hLinkCursor = NULL; // No cursor as yet
m_crLinkColor = RGB( 0, 0, 255); // Blue
m_crVisitedColor = RGB( 85, 26, 139); // Purple
m_crHoverColor = RGB( 255, 0, 0); // Red
m_bOverControl = FALSE; // Cursor not yet over control
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()
{
m_Font.DeleteObject();
if (m_hLinkCursor)
DestroyCursor(m_hLinkCursor);
}
/////////////////////////////////////////////////////////////////////////////
// CHyperLink message handlers
BOOL CHyperLink::PreTranslateMessage(MSG* pMsg)
{
m_ToolTip.RelayEvent(pMsg);
return CStatic::PreTranslateMessage(pMsg);
}
void CHyperLink::OnClicked()
{
m_bVisited = TRUE; //(result > HINSTANCE_ERROR);
SetVisited(); // Repaint to show visited Color
GotoURL(m_strURL, SW_SHOW);
}
HBRUSH CHyperLink::CtlColor(CDC* pDC, UINT)
{
if (m_bOverControl)
pDC->SetTextColor(m_crHoverColor);
else if (m_bVisited)
pDC->SetTextColor(m_crVisitedColor);
else
pDC->SetTextColor(m_crLinkColor);
// transparent text.
pDC->SetBkMode(TRANSPARENT);
return (HBRUSH)GetStockObject(NULL_BRUSH);
}
BOOL CHyperLink::OnSetCursor(CWnd* /*pWnd*/, UINT /*nHitTest*/, UINT /*message*/)
{
if (m_hLinkCursor)
{
::SetCursor(m_hLinkCursor);
return TRUE;
}
return FALSE;
}
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);
}
// Create the font
LOGFONT lf;
GetFont()->GetLogFont(&lf);
lf.lfUnderline = (unsigned char) 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
// Create the tooltip
CRect rect;
GetClientRect(rect);
m_ToolTip.Create(this);
m_ToolTip.AddTool(this, m_strURL, rect, TOOLTIP_ID);
SetTimer(1, 100, NULL);
CStatic::PreSubclassWindow();
}
/////////////////////////////////////////////////////////////////////////////
// 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::SetColors(COLORREF crLinkColor, COLORREF crVisitedColor,
COLORREF crHoverColor /* = -1 */)
{
m_crLinkColor = crLinkColor;
m_crVisitedColor = crVisitedColor;
if (crHoverColor == -1)
m_crHoverColor = ::GetSysColor(COLOR_HIGHLIGHT);
else
m_crHoverColor = crHoverColor;
if (::IsWindow(m_hWnd))
Invalidate();
}
COLORREF CHyperLink::GetLinkColor() const
{
return m_crLinkColor;
}
COLORREF CHyperLink::GetVisitedColor() const
{
return m_crVisitedColor;
}
COLORREF CHyperLink::GetHoverColor() const
{
return m_crHoverColor;
}
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 = (unsigned char) m_bUnderline;
m_Font.DeleteObject();
m_Font.CreateFontIndirect(&lf);
SetFont(&m_Font);
Invalidate();
}
}
BOOL CHyperLink::GetUnderline() const
{
return m_bUnderline;
}
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.
//
void CHyperLink::PositionWindow()
{
if (!::IsWindow(GetSafeHwnd()) || !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();
CFont* pOldFont = pDC->SelectObject(&m_Font);
CSize Extent = pDC->GetTextExtent(strWndText);
pDC->SelectObject(pOldFont);
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
// 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);
*retdata = 0;
if (retval == ERROR_SUCCESS)
{
long datasize = MAX_PATH;
TCHAR data[MAX_PATH];
retval = RegQueryValue(hkey, NULL, data, &datasize);
if (retval == ERROR_SUCCESS)
{
lstrcpy(retdata, data);
RegCloseKey(hkey);
}
}
return retval;
}
void CHyperLink::ReportError(int nError)
{
CString str;
CString strError;
strError.Format(_T("Unknown error (%d) occurred."), nError);
str = _T("Unable to open hyperlink:\n\n") + strError;
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 = _T('\0'); // Remove the parameter
}
else
*pos = _T('\0'); // Remove the parameter
lstrcat(pos, _T(" "));
lstrcat(pos, url);
result = (HINSTANCE) WinExec((LPSTR)key,showcmd);
}
}
}
return result;
}
void CHyperLink::OnTimer(UINT)
{
CPoint point;
::GetCursorPos(&point);
CRect rect;
GetWindowRect(&rect);
if (rect.PtInRect(point)) // Cursor is currently over control
{
m_bOverControl = TRUE;
}
else
{
m_bOverControl = FALSE;
}
RedrawWindow();
}
void CHyperLink::OnDestroy()
{
KillTimer(1);
CStatic::OnDestroy();
}