mybutton.cpp

一个永远按不到的按钮

// MyButton.cpp : implementation file
//

#include "stdafx.h"
#include "Button.h"
#include "MyButton.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CMyButton

CMyButton::CMyButton()
{
	m_nJumpDistance=10; //移动的距离
}

CMyButton::~CMyButton()
{
}


BEGIN_MESSAGE_MAP(CMyButton, CButton)
	//{{AFX_MSG_MAP(CMyButton)
	ON_WM_MOUSEMOVE()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMyButton message handlers

void CMyButton::OnMouseMove(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	CWnd *pParent=GetParent();
	if(!pParent)pParent=GetDesktopWindow();
	CRect ParentRect;
	pParent->GetClientRect(ParentRect);
	ClientToScreen(&point);
	pParent->ScreenToClient(&point);
	CRect ButtonRect;
	GetWindowRect(ButtonRect);
	pParent->ScreenToClient(ButtonRect);
	CPoint Center=ButtonRect.CenterPoint();
	CSize CriticalSize(ButtonRect.Width()/6,ButtonRect.Height()/6);
	CRect NewButtonRect=ButtonRect;
	if(point.x-CriticalSize.cx>Center.x)
	{
		if(ButtonRect.left>ParentRect.left+ButtonRect.Width()+m_nJumpDistance)
			NewButtonRect-=CSize(ButtonRect.right-point.x+m_nJumpDistance,0);
		else
			NewButtonRect+=CSize(point.x-ButtonRect.left+m_nJumpDistance,0);
	}
	else if(point.x+CriticalSize.cx<Center.x)
	{
		if(ButtonRect.right<ParentRect.right-ButtonRect.Width()-m_nJumpDistance)
			NewButtonRect+=CSize(point.x-ButtonRect.left+m_nJumpDistance,0);
		else
			NewButtonRect-=CSize(ButtonRect.right-point.x+m_nJumpDistance,0);
	}
	if(point.y-CriticalSize.cy>Center.y)
	{
		if(ButtonRect.top>ParentRect.top+ButtonRect.Height()+m_nJumpDistance)
			NewButtonRect-=CSize(0,ButtonRect.bottom-point.y+m_nJumpDistance);
		else
			NewButtonRect+=CSize(0,point.y-ButtonRect.top+m_nJumpDistance);
	}
	else if(point.y+CriticalSize.cy<Center.y)
	{
		if(ButtonRect.bottom<ParentRect.bottom-ButtonRect.Height()-m_nJumpDistance)
			NewButtonRect+=CSize(0,point.y-ButtonRect.top+m_nJumpDistance);
		else
			NewButtonRect-=CSize(0,ButtonRect.bottom-point.y+m_nJumpDistance);
	}
	MoveWindow(NewButtonRect);
	RedrawWindow();
	CButton::OnMouseMove(nFlags, point);
}