三、程序代码
////////////////////////////////////////////////////////////////////////////
#ifndef _HYPRILNK_H
#define _HYPRILNK_H
// Simple text hyperlink derived from CString
class CHyperlink : public CString {
public:
CHyperlink(LPCTSTR lpLink = NULL) : CString(lpLink) { }
~CHyperlink() { }
const CHyperlink& operator=(LPCTSTR lpsz) {
CString::operator=(lpsz);
return *this;
}
operator LPCTSTR() {
return CString::operator LPCTSTR();
}
virtual HINSTANCE Navigate() {
return IsEmpty() ? NULL :
ShellExecute(0, _T("open"), *this, 0, 0, SW_SHOWNORMAL);
}
};
#endif
/////////////////////////////////////////////////////////////////////////////////
#ifndef _STATLINK_H
#define _STATLINK_H
#include "HyprLink.h"
class CStaticLink : public CStatic {
public:
DECLARE_DYNAMIC(CStaticLink)
CStaticLink(LPCTSTR lpText = NULL, BOOL bDeleteOnDestroy=FALSE);
~CStaticLink() { }
// Hyperlink contains URL/filename. If NULL, I will use the window text.
// (GetWindowText) to get the target.
CHyperlink m_link;
COLORREF m_color;
// Default colors you can change
// These are global, so they're the same for all links.
static COLORREF g_colorUnvisited;
static COLORREF g_colorVisited;
static HCURSOR g_hCursorLink;
protected:
CFont m_font; // underline font for text control
BOOL m_bDeleteOnDestroy; // delete object when window destroyed?
virtual void PostNcDestroy();
// message handlers
DECLARE_MESSAGE_MAP()
afx_msg UINT OnNcHitTest(CPoint point);
afx_msg HBRUSH CtlColor(CDC* pDC, UINT nCtlColor);
afx_msg void OnLButtonDown(UINT nFlags, CPoint point);
afx_msg BOOL OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message);
};
#endif _STATLINK_H
/////////////////////////////////////////////////////////////////////////
#include "StdAfx.h"
#include "StatLink.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
COLORREF CStaticLink::g_colorUnvisited = RGB(0,0,255); // blue
COLORREF CStaticLink::g_colorVisited = RGB(128,0,128); // purple
HCURSOR CStaticLink::g_hCursorLink = NULL;
IMPLEMENT_DYNAMIC(CStaticLink, CStatic)
BEGIN_MESSAGE_MAP(CStaticLink, CStatic)
ON_WM_NCHITTEST()
ON_WM_CTLCOLOR_REFLECT()
ON_WM_LBUTTONDOWN()
ON_WM_SETCURSOR()
END_MESSAGE_MAP()
///////////////////
// Constructor sets default colors = blue/purple.
// bDeleteOnDestroy is used internally by PixieLib in CPixieDlg.
CStaticLink::CStaticLink(LPCTSTR lpText, BOOL bDeleteOnDestroy)
{
m_link = lpText; // link text (NULL ==> window text)
m_color = g_colorUnvisited; // not visited yet
m_bDeleteOnDestroy = bDeleteOnDestroy; // delete object with window?
}
//////////////////
// 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.
//
UINT CStaticLink::OnNcHitTest(CPoint point)
{
return HTCLIENT;
}
//////////////////
// Handle reflected WM_CTLCOLOR to set custom control color.
// For a text control, use visited/unvisited colors and underline font.
// For non-text controls, do nothing. Also ensures SS_NOTIFY is on.
//
HBRUSH CStaticLink::CtlColor(CDC* pDC, UINT nCtlColor)
{
ASSERT(nCtlColor == CTLCOLOR_STATIC);
DWORD dwStyle = GetStyle();
HBRUSH hbr = NULL;
if ((dwStyle & 0xFF) <= SS_RIGHT) {
// this is a text control: set up font and colors
if (!(HFONT)m_font) {
// first time init: create font
LOGFONT lf;
GetFont()->GetObject(sizeof(lf), &lf);
lf.lfUnderline = TRUE;
m_font.CreateFontIndirect(&lf);
}
// use underline font and visited/unvisited colors
pDC->SelectObject(&m_font);
pDC->SetTextColor(m_color);
pDC->SetBkMode(TRANSPARENT);
// return hollow brush to preserve parent background color
hbr = (HBRUSH)::GetStockObject(HOLLOW_BRUSH);
}
return hbr;
}
/////////////////
// Handle mouse click: navigate link
//
void CStaticLink::OnLButtonDown(UINT nFlags, CPoint point)
{
if (m_link.IsEmpty()) {
// no link: try to load from resource string or window text
m_link.LoadString(GetDlgCtrlID()) || (GetWindowText(m_link),1);
if (m_link.IsEmpty())
return;
}
// Call ShellExecute to run the file.
// For an URL, this means opening it in the browser.
//
HINSTANCE h = m_link.Navigate();
if ((UINT)h > 32) { // success!
m_color = g_colorVisited; // change color
Invalidate(); // repaint
} else {
MessageBeep(0); // unable to execute file!
TRACE(_T("*** WARNING: CStaticLink: unable to navigate link %s/n"),(LPCTSTR)m_link);
}
}
//////////////////
// Set "hand" cursor to cue user that this is a link. If app has not set
// g_hCursorLink, then try to get the cursor from winhlp32.exe,
// resource 106, which is a pointing finger. This is a bit of a kludge,
// but it works.
//
BOOL CStaticLink::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message)
{
if (g_hCursorLink == NULL) {
static bTriedOnce = FALSE;
if (!bTriedOnce) {
CString windir;
GetWindowsDirectory(windir.GetBuffer(MAX_PATH), MAX_PATH);
windir.ReleaseBuffer();
windir += _T("//winhlp32.exe");
HMODULE hModule = LoadLibrary(windir);
if (hModule) {
g_hCursorLink = CopyCursor(::LoadCursor(hModule, MAKEINTRESOURCE(106)));
}
FreeLibrary(hModule);
bTriedOnce = TRUE;
}
}
if (g_hCursorLink) {
::SetCursor(g_hCursorLink);
return TRUE;
}
return FALSE;
}
//////////////////
// Normally, a control class is not destoyed when the window is;
// however, CPixieDlg creates static controls with "new" instead of
// as class members, so it's convenient to allow the option of destroying
// object with window. In applications where you want the object to be
// destoyed along with the window, you can call constructor with
// bDeleteOnDestroy=TRUE.
//
void CStaticLink::PostNcDestroy()
{
if (m_bDeleteOnDestroy)
delete this;
}
//////////////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "resource.h"
#include "TraceWin.h"
#include "StatLink.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
class CMyDialog : public CDialog {
public:
CMyDialog(CWnd* pParent = NULL);
~CMyDialog();
//protected:
private:
HICON m_hIcon;
CStaticLink m_wndLink1; // web links
CStaticLink m_wndLink2;
// the button cursor
HCURSOR m_hButtonCursor;
virtual BOOL OnInitDialog();
afx_msg void OnPaint();
afx_msg HCURSOR OnQueryDragIcon();
afx_msg BOOL OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT msg);
DECLARE_MESSAGE_MAP()
};
BEGIN_MESSAGE_MAP(CMyDialog, CDialog)
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
ON_WM_SETCURSOR()
END_MESSAGE_MAP()
CMyDialog::CMyDialog(CWnd* pParent /*=NULL*/)
: CDialog(IDD_MYDIALOG, pParent)
{}
CMyDialog::~CMyDialog()
{}
//////////////////
// Initialize dialog
//
BOOL CMyDialog::OnInitDialog()
{
CDialog::OnInitDialog();
// set up hyperlinks
m_wndLink1.m_link = _T("http://www.vckbase.com");
m_wndLink2.m_link = _T("mailto:vckbase@public.hk.hi.cn");
m_wndLink1.SubclassDlgItem(IDC_PDURL, this);
m_wndLink2.SubclassDlgItem(IDC_MSDNURL, this);
// Set the icon for this dialog. The framework does this automatically
// when the application's main window is not a dialog
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
SetIcon(m_hIcon, TRUE); // Set big icon
SetIcon(m_hIcon, FALSE); // Set small icon
// load button cursor
m_hButtonCursor = AfxGetApp()->LoadCursor(IDC_MYHAND);
return TRUE; // return TRUE unless you set the focus to a control
}
//////////////////
// Set cursor if mouse is over a button.
//
BOOL CMyDialog::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT msg)
{
CString sClassName;
::GetClassName(pWnd->GetSafeHwnd(),sClassName.GetBuffer(80),80);
if (sClassName=="Button" && m_hButtonCursor) {
::SetCursor(m_hButtonCursor);
return TRUE;
}
return CDialog::OnSetCursor(pWnd, nHitTest, msg);
} |
四、小结
本文不仅介绍了动态改变程序中的鼠标形状，还介绍了如何实现静态文本的超连接，读者朋友可以将这部分代码修改后应用到自己开放的应用程序中，例如在程序中添加自己的网页和邮箱地址等，我想这一定是件很令人鼓舞的事情吧。
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