HyperLink.cpp
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- // 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 P錶 K. T鴑der 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()
- {
- 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()
- {
- 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 empty. DUH!
- 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)
- {
- 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();
- }
- // 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 P錶 K. T鴑der
- 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()
- {
- 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 outnof 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 invalidn(non-Win32 .EXE or error in .EXE image)."; break;
- case SE_ERR_ACCESSDENIED: str = "The operating system deniednaccess to the specified file."; break;
- case SE_ERR_ASSOCINCOMPLETE: str = "The filename association isnincomplete or invalid."; break;
- case SE_ERR_DDEBUSY: str = "The DDE transaction could notnbe completed because other DDE transactionsnwere being processed."; break;
- case SE_ERR_DDEFAIL: str = "The DDE transaction failed."; break;
- case SE_ERR_DDETIMEOUT: str = "The DDE transaction could notnbe 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 associatednwith 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:nn" + 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 = ' '; // Remove the parameter
- }
- else
- *pos = ' '; // Remove the parameter
- lstrcat(pos, _T(" "));
- lstrcat(pos, url);
- result = (HINSTANCE) WinExec(key,showcmd);
- }
- }
- }
- return result;
- }