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// HyperLink.cpp : implementation file
//
// HyperLink static control.
//
// Copyright (C) 1997, 1998 Giancarlo Iovino (giancarlo@saria.com)
// All rights reserved. May not be sold for profit.
//
// This code is based on CHyperlink by Chris Maunder.
// "GotoURL" function by Stuart Patterson appeared in the Aug, 1997
// Windows Developer's Journal.
// "Default hand cursor" from Paul DiLascia's Jan 1998 MSJ article.
#include <stdafx.h>
#include "HyperLink.h"
#if defined(_DEBUG) && !defined(MMGR)
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
#define TOOLTIP_ID 1
#define SETBITS(dw, bits) (dw |= bits)
#define CLEARBITS(dw, bits) (dw &= ~(bits))
#define BITSET(dw, bit) (((dw) & (bit)) != 0L)
/////////////////////////////////////////////////////////////////////////////
// CHyperLink
const DWORD CHyperLink::StyleUnderline = 0x00000001; // Underline bit
const DWORD CHyperLink::StyleUseHover = 0x00000002; // Hand over coloring bit
const DWORD CHyperLink::StyleAutoSize = 0x00000004; // Auto size bit
const DWORD CHyperLink::StyleDownClick = 0x00000008; // Down click mode bit
const DWORD CHyperLink::StyleGetFocusOnClick = 0x00000010; // Get focus on click bit
const DWORD CHyperLink::StyleNoHandCursor = 0x00000020; // No hand cursor bit
const DWORD CHyperLink::StyleNoActiveColor = 0x00000040; // No active color bit
COLORREF CHyperLink::g_crLinkColor = RGB(0, 0, 255); // Blue
COLORREF CHyperLink::g_crActiveColor = RGB(0, 128, 128); // Dark cyan
COLORREF CHyperLink::g_crVisitedColor = RGB(128, 0, 128); // Purple
COLORREF CHyperLink::g_crHoverColor = RGB(255, 0, 0 ); // Red
HCURSOR CHyperLink::g_hLinkCursor = NULL; // No cursor
CHyperLink::CHyperLink()
{
m_bOverControl = FALSE; // Cursor not yet over control
m_bVisited = FALSE; // Link has not been visited yet
m_bLinkActive = FALSE; // Control doesn't own the focus yet
m_strURL.Empty(); // Set URL to an empty string
// Set default styles
m_dwStyle = StyleUnderline|StyleAutoSize|StyleGetFocusOnClick;
}
CHyperLink::~CHyperLink()
{
m_Font.DeleteObject();
}
IMPLEMENT_DYNAMIC(CHyperLink, CStatic)
BEGIN_MESSAGE_MAP(CHyperLink, CStatic)
//{{AFX_MSG_MAP(CHyperLink)
ON_WM_CTLCOLOR_REFLECT()
ON_WM_SETCURSOR()
ON_WM_MOUSEMOVE()
ON_WM_LBUTTONUP()
ON_WM_SETFOCUS()
ON_WM_KILLFOCUS()
ON_WM_KEYDOWN()
ON_WM_NCHITTEST()
ON_WM_LBUTTONDOWN()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CHyperLink message handlers
BOOL CHyperLink::PreTranslateMessage(MSG* pMsg)
{
m_ToolTip.RelayEvent(pMsg);
return CStatic::PreTranslateMessage(pMsg);
}
void CHyperLink::PreSubclassWindow()
{
// If the URL string is empty try to set it to the window text
if (m_strURL.IsEmpty())
GetWindowText(m_strURL);
// Check that the window text isn't empty.
// If it is, set it as URL string.
CString strWndText;
GetWindowText(strWndText);
if (strWndText.IsEmpty()) {
// Set the URL string as the window text
ASSERT(!m_strURL.IsEmpty()); // window text and URL both NULL!
CStatic::SetWindowText(m_strURL);
}
// Get the current window font
CFont* pFont = GetFont();
if (pFont != NULL) {
LOGFONT lf;
pFont->GetLogFont(&lf);
lf.lfUnderline = BITSET(m_dwStyle, StyleUnderline);
if (m_Font.CreateFontIndirect(&lf))
CStatic::SetFont(&m_Font);
// Adjust window size to fit URL if necessary
AdjustWindow();
}
else {
// if GetFont() returns NULL then probably the static
// control is not of a text type: it's better to set
// auto-resizing off
CLEARBITS(m_dwStyle,StyleAutoSize);
}
if (!BITSET(m_dwStyle,StyleNoHandCursor))
SetDefaultCursor(); // Try to load an "hand" cursor
// Create the tooltip
CRect rect;
GetClientRect(rect);
m_ToolTip.Create(this);
m_ToolTip.AddTool(this, m_strURL, rect, TOOLTIP_ID);
CStatic::PreSubclassWindow();
}
// Handler for WM_CTLCOLOR reflected message (see message map)
HBRUSH CHyperLink::CtlColor(CDC* pDC, UINT nCtlColor)
{
ASSERT(nCtlColor == CTLCOLOR_STATIC);
if (m_bOverControl && BITSET(m_dwStyle,StyleUseHover))
pDC->SetTextColor(g_crHoverColor);
else if (!BITSET(m_dwStyle,StyleNoActiveColor) && m_bLinkActive)
pDC->SetTextColor(g_crActiveColor);
else if (m_bVisited)
pDC->SetTextColor(g_crVisitedColor);
else
pDC->SetTextColor(g_crLinkColor);
// Set transparent drawing mode
pDC->SetBkMode(TRANSPARENT);
return (HBRUSH)GetStockObject(NULL_BRUSH);
}
void CHyperLink::OnMouseMove(UINT nFlags, CPoint point)
{
if (m_bOverControl) // Cursor currently over control
{
CRect rect;
GetClientRect(rect);
if (!rect.PtInRect(point))
{
m_bOverControl = FALSE;
ReleaseCapture();
Invalidate();
return;
}
}
else // Cursor has left control area
{
m_bOverControl = TRUE;
Invalidate();
SetCapture();
}
}
//////////////////////////////////////////////////////////////////////////
// "Normally, a static control does not get mouse events unless it has
// SS_NOTIFY. This achieves the same effect as SS_NOTIFY, but it's fewer
// lines of code and more reliable than turning on SS_NOTIFY in OnCtlColor
// because Windows doesn't send WM_CTLCOLOR to bitmap static controls."
// (Paul DiLascia)
LRESULT CHyperLink::OnNcHitTest(CPoint /*point*/)
{
return HTCLIENT;
}
void CHyperLink::OnLButtonDown(UINT /*nFlags*/, CPoint /*point*/)
{
if (BITSET(m_dwStyle,StyleGetFocusOnClick))
SetFocus(); // Set the focus and make the link active
if (BITSET(m_dwStyle,StyleDownClick))
FollowLink();
m_bLinkActive = TRUE;
}
void CHyperLink::OnLButtonUp(UINT /*nFlags*/, CPoint /*point*/)
{
if (m_bLinkActive && !BITSET(m_dwStyle,StyleDownClick))
FollowLink();
}
BOOL CHyperLink::OnSetCursor(CWnd* /*pWnd*/, UINT /*nHitTest*/, UINT /*message*/)
{
if (g_hLinkCursor)
{
::SetCursor(g_hLinkCursor);
return TRUE;
}
return FALSE;
}
void CHyperLink::OnSetFocus(CWnd* /*pOldWnd*/)
{
m_bLinkActive = TRUE;
Invalidate(); // Repaint to set the focus
}
void CHyperLink::OnKillFocus(CWnd* /*pNewWnd*/)
{
// Assume that control lost focus = mouse out
// this avoid troubles with the Hover color
m_bOverControl = FALSE;
m_bLinkActive = FALSE;
Invalidate(); // Repaint to unset the focus
}
void CHyperLink::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)
{
if (nChar == VK_SPACE)
FollowLink();
else
CStatic::OnKeyDown(nChar, nRepCnt, nFlags);
}
/////////////////////////////////////////////////////////////////////////////
// CHyperLink operations
void CHyperLink::SetColors( COLORREF crLinkColor,
COLORREF crActiveColor,
COLORREF crVisitedColor,
COLORREF crHoverColor /* = -1 */)
{
g_crLinkColor = crLinkColor;
g_crActiveColor = crActiveColor;
g_crVisitedColor = crVisitedColor;
if (crHoverColor == -1)
g_crHoverColor = ::GetSysColor(COLOR_HIGHLIGHT);
else
g_crHoverColor = crHoverColor;
}
void CHyperLink::SetColors(HYPERLINKCOLORS& linkColors) {
g_crLinkColor = linkColors.crLink;
g_crActiveColor = linkColors.crActive;
g_crVisitedColor = linkColors.crVisited;
g_crHoverColor = linkColors.crHover;
}
void CHyperLink::GetColors(HYPERLINKCOLORS& linkColors) {
linkColors.crLink = g_crLinkColor;
linkColors.crActive = g_crActiveColor;
linkColors.crVisited = g_crVisitedColor;
linkColors.crHover = g_crHoverColor;
}
void CHyperLink::SetLinkCursor(HCURSOR hCursor) {
ASSERT(hCursor != NULL);
g_hLinkCursor = hCursor;
if (g_hLinkCursor == NULL)
SetDefaultCursor();
}
HCURSOR CHyperLink::GetLinkCursor() {
return g_hLinkCursor;
}
BOOL CHyperLink:: ModifyLinkStyle(DWORD dwRemove, DWORD dwAdd,
BOOL bApply /* =TRUE */)
{
// Check if we are adding and removing the same style
if ((dwRemove & dwAdd) != 0L)
return FALSE;
// Remove old styles and set the new ones
CLEARBITS(m_dwStyle, dwRemove);
SETBITS(m_dwStyle, dwAdd);
if (bApply && ::IsWindow(GetSafeHwnd())) {
// If possible, APPLY the new styles on the fly
if (BITSET(dwAdd,StyleUnderline) || BITSET(dwRemove,StyleUnderline))
SwitchUnderline();
if (BITSET(dwAdd,StyleAutoSize))
AdjustWindow();
if (BITSET(dwRemove,StyleUseHover))
Invalidate();
}
return TRUE;
}
DWORD CHyperLink::GetLinkStyle() const {
return m_dwStyle;
}
void CHyperLink::SetURL(CString strURL)
{
m_strURL = strURL;
if (::IsWindow(GetSafeHwnd())) {
ShowWindow(SW_HIDE);
AdjustWindow();
m_ToolTip.UpdateTipText(strURL, this, TOOLTIP_ID);
ShowWindow(SW_SHOW);
}
}
CString CHyperLink::GetURL() const {
return m_strURL;
}
void CHyperLink::SetWindowText(LPCTSTR lpszText)
{
ASSERT(lpszText != NULL);
if (::IsWindow(GetSafeHwnd())) {
// Set the window text and adjust its size while the window
// is kept hidden in order to allow dynamic modification
ShowWindow(SW_HIDE); // Hide window
// Call the base class SetWindowText()
CStatic::SetWindowText(lpszText);
// Resize the control if necessary
AdjustWindow();
ShowWindow(SW_SHOW); // Show window
}
}
void CHyperLink::SetFont(CFont* pFont)
{
ASSERT(::IsWindow(GetSafeHwnd()));
ASSERT(pFont != NULL);
// Set the window font and adjust its size while the window
// is kept hidden in order to allow dynamic modification
ShowWindow(SW_HIDE); // Hide window
LOGFONT lf;
// Create the new font
pFont->GetLogFont(&lf);
m_Font.DeleteObject();
m_Font.CreateFontIndirect(&lf);
// Call the base class SetFont()
CStatic::SetFont(&m_Font);
// Resize the control if necessary
AdjustWindow();
ShowWindow(SW_SHOW); // Show window
}
// Function to set underline on/off
void CHyperLink::SwitchUnderline()
{
LOGFONT lf;
CFont* pFont = GetFont();
if (pFont != NULL) {
pFont->GetLogFont(&lf);
lf.lfUnderline = BITSET(m_dwStyle,StyleUnderline);
m_Font.DeleteObject();
m_Font.CreateFontIndirect(&lf);
SetFont(&m_Font);
}
}
// Move and resize the window so that its client area has the same size
// as the hyperlink text. This prevents the hyperlink cursor being active
// when it is not over the text.
void CHyperLink::AdjustWindow()
{
ASSERT(::IsWindow(GetSafeHwnd()));
if (!BITSET(m_dwStyle,StyleAutoSize))
return;
// Get the current window rect
CRect rcWnd;
GetWindowRect(rcWnd);
// For a child CWnd object, window rect is relative to the
// upper-left corner of the parent window’s client area.
CWnd* pParent = GetParent();
if (pParent)
pParent->ScreenToClient(rcWnd);
// Get the current client rect
CRect rcClient;
GetClientRect(rcClient);
// Calc border size based on window and client rects
int borderWidth = rcWnd.Width() - rcClient.Width();
int borderHeight = rcWnd.Height() - rcClient.Height();
// Get the extent of 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 style
DWORD dwStyle = GetStyle();
// Recalc window size and position based on text justification
if (BITSET(dwStyle, SS_CENTERIMAGE))
rcWnd.DeflateRect(0, (rcWnd.Height() - Extent.cy) / 2);
else
rcWnd.bottom = rcWnd.top + Extent.cy;
if (BITSET(dwStyle, SS_CENTER))
rcWnd.DeflateRect((rcWnd.Width() - Extent.cx) / 2, 0);
else if (BITSET(dwStyle,SS_RIGHT))
rcWnd.left = rcWnd.right - Extent.cx;
else // SS_LEFT
rcWnd.right = rcWnd.left + Extent.cx;
// Move and resize the window
MoveWindow(rcWnd.left, rcWnd.top, rcWnd.Width() + borderWidth,
rcWnd.Height() + borderHeight);
}
void CHyperLink::SetVisited(BOOL bVisited /* = TRUE */) {
m_bVisited = bVisited;
}
BOOL CHyperLink::IsVisited() const {
return m_bVisited;
}
/////////////////////////////////////////////////////////////////////////////
// CHyperLink implementation
// The following function appeared in Paul DiLascia's Jan 1998
// MSJ articles. It loads a "hand" cursor from "winhlp32.exe"
// resources
void CHyperLink::SetDefaultCursor()
{
if (g_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)
g_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);
if (retval == ERROR_SUCCESS) {
long datasize = MAX_PATH;
TCHAR data[MAX_PATH];
RegQueryValue(hkey, NULL, data, &datasize);
lstrcpy(retdata,data);
RegCloseKey(hkey);
}
return retval;
}
// Error report function
void CHyperLink::ReportError(int nError)
{
CString str;
switch (nError) {
case 0: str = _T("The operating system is out\nof memory or resources."); break;
case ERROR_FILE_NOT_FOUND: str = _T("The specified file was not found."); break;
case ERROR_PATH_NOT_FOUND: str = _T("The specified path was not found."); break;
case ERROR_BAD_FORMAT: str = _T("The .EXE file is invalid\n(non-Win32 .EXE or error in .EXE image)."); break;
case SE_ERR_ACCESSDENIED: str = _T("The operating system denied\naccess to the specified file."); break;
case SE_ERR_ASSOCINCOMPLETE: str = _T("The filename association is\nincomplete or invalid."); break;
case SE_ERR_DDEBUSY: str = _T("The DDE transaction could not\nbe completed because other DDE transactions\nwere being processed."); break;
case SE_ERR_DDEFAIL: str = _T("The DDE transaction failed."); break;
case SE_ERR_DDETIMEOUT: str = _T("The DDE transaction could not\nbe completed because the request timed out."); break;
case SE_ERR_DLLNOTFOUND: str = _T("The specified dynamic-link library was not found."); break;
//case SE_ERR_FNF: str = _T("Windows 95 only: The specified file was not found."); break;
case SE_ERR_NOASSOC: str = _T("There is no application associated\nwith the given filename extension."); break;
case SE_ERR_OOM: str = _T("There was not enough memory to complete the operation."); break;
//case SE_ERR_PNF: str = _T("The specified path was not found."); break;
case SE_ERR_SHARE: str = _T("A sharing violation occurred. "); break;
default: str.Format(_T("Unknown Error (%d) occurred."), nError); break;
}
str = "Can't open link:\n\n" + str;
AfxMessageBox(str, MB_ICONEXCLAMATION | MB_OK);
}
// "GotoURL" function by Stuart Patterson
// As seen in the August, 1997 Windows Developer's Journal.
HINSTANCE CHyperLink::GotoURL(LPCTSTR url, int showcmd)
{
USES_CONVERSION;
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);
result = (HINSTANCE)WinExec(T2A(key), showcmd);
PROCESS_INFORMATION ProcessInformation;
STARTUPINFO startupinfo;
memset(&startupinfo, 0, sizeof(startupinfo));
startupinfo.cb = sizeof(startupinfo);
CreateProcess(0, key, 0, 0, 0, 0, 0, 0, &startupinfo, &ProcessInformation);
}
}
}
return result;
}
// Activate the link
void CHyperLink::FollowLink()
{
int result = (int) GotoURL(m_strURL, SW_SHOW);
if (result <= HINSTANCE_ERROR) {
MessageBeep(MB_ICONEXCLAMATION); // Unable to follow link
ReportError(result);
} else {
// Mark link as visited and repaint window
m_bVisited = TRUE;
Invalidate();
}
}
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