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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�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. #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�l K. T�nder 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 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);