www.pudn.com > Mos.rar > 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 = FALSE; // 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.
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);
}
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;
}