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Hyperlink.cpp
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Hyperlink.cpp
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// Copyleft 2004 Chris Korda
// This program is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 of the License, or any later version.
/*
chris korda
revision history:
rev date comments
00 26dec04 initial version
simple hyperlink control
*/
// Hyperlink.cpp : implementation file
//
#include "stdafx.h"
#include "Resource.h"
#include "Hyperlink.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
/////////////////////////////////////////////////////////////////////////////
// CHyperlink
CHyperlink::CHyperlink()
{
m_Cursor = LoadCursor(nullptr, IDC_HAND);
m_Visited = FALSE;
m_Hovering = FALSE;
m_ColorLink = RGB(0, 0, 255); // blue
m_ColorVisited = RGB(128, 0, 128); // purple
m_ColorHover = RGB(255, 0, 0); // red
}
CHyperlink::~CHyperlink()
{
}
void CHyperlink::SetUrl(LPCSTR Url)
{
m_Url = Url;
}
void CHyperlink::FitWindowToUrl()
{
// adjust window's right and bottom edges to fit URL text
CRect r;
CWnd *pParent = GetParent();
if (pParent != NULL) {
GetWindowRect(r);
pParent->ScreenToClient(r);
} else
GetClientRect(r);
CString s;
GetWindowText(s);
CDC *pDC = GetDC();
ASSERT(pDC != NULL);
CFont *pOldFont = (CFont *)pDC->SelectObject(GetFont());
CSize Extent = pDC->GetTextExtent(s);
pDC->SelectObject(pOldFont);
ReleaseDC(pDC);
r.right = r.left + Extent.cx;
r.bottom = r.top + Extent.cy;
MoveWindow(r);
}
void CHyperlink::SetUnderline(bool Enable)
{
LOGFONT lf;
if (GetFont()->GetLogFont(&lf)) {
lf.lfUnderline = TRUE;
m_Font.Detach();
m_Font.CreateFontIndirect(&lf);
SetFont(&m_Font);
FitWindowToUrl();
}
}
void CHyperlink::SetColors(COLORREF Link, COLORREF Visited, COLORREF Hover)
{
m_ColorLink = Link;
m_ColorVisited = Visited;
m_ColorHover = Hover;
Invalidate();
}
bool CHyperlink::GotoUrl(LPCSTR Url)
{
int retc = (int)ShellExecute(NULL, NULL, Url, NULL, NULL, SW_SHOWNORMAL);
return(retc > HINSTANCE_ERROR);
}
BEGIN_MESSAGE_MAP(CHyperlink, CStatic)
//{{AFX_MSG_MAP(CHyperlink)
ON_WM_CTLCOLOR_REFLECT()
ON_WM_LBUTTONDOWN()
ON_WM_SETCURSOR()
ON_WM_MOUSEMOVE()
//}}AFX_MSG_MAP
ON_MESSAGE(WM_MOUSELEAVE, OnMouseLeave)
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CHyperlink message handlers
void CHyperlink::PreSubclassWindow()
{
FitWindowToUrl();
CStatic::PreSubclassWindow();
}
HBRUSH CHyperlink::CtlColor(CDC* pDC, UINT nCtlColor)
{
pDC->SetTextColor(m_Hovering ? m_ColorHover :
(m_Visited ? m_ColorVisited : m_ColorLink));
pDC->SetBkMode(TRANSPARENT); // transparent background
return (HBRUSH)GetStockObject(NULL_BRUSH);
}
void CHyperlink::OnLButtonDown(UINT nFlags, CPoint point)
{
if (GotoUrl(m_Url))
m_Visited = TRUE;
else
AfxMessageBox(IDS_HLINK_CANT_LAUNCH);
CStatic::OnLButtonDown(nFlags, point);
}
BOOL CHyperlink::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message)
{
if (m_Cursor != NULL) {
::SetCursor(m_Cursor);
return FALSE;
}
return CStatic::OnSetCursor(pWnd, nHitTest, message);
}
void CHyperlink::OnMouseMove(UINT nFlags, CPoint point)
{
if (!m_Hovering) {
TRACKMOUSEEVENT tme;
memset(&tme, 0, sizeof(tme));
tme.cbSize = sizeof(tme);
tme.dwFlags = TME_LEAVE;
tme.hwndTrack = m_hWnd;
_TrackMouseEvent(&tme); // request WM_MOUSELEAVE notification
m_Hovering = TRUE;
Invalidate();
}
CStatic::OnMouseMove(nFlags, point);
}
LRESULT CHyperlink::OnMouseLeave(WPARAM wParam, LPARAM lParam)
{
m_Hovering = FALSE;
Invalidate();
return(0);
}