53上位机VC MF实现热点效果按钮

qq263946146 · 2015-12-5 22:43:19

53上位机VC MF实现热点效果按钮

功能展示

一般我们人眼会追随动态的东西，当鼠标没过热点按钮时，按钮发生变化，就可以引起用户的注意，所以我们当前例程就来实现热点按钮功能，效果如图

要点提示

热点按钮的实现关键点用到了GetCursorPos()和PtInRect();

BOOL GetCursorPos( LPPOINT lpPoint // address of structure for cursorposition ); lpPoint 是一个指向[url=]POINT[/url] 结构体的指针，接收相对于桌面的鼠标位置

BOOL PtInRect( POINT point ) const;判断指定的point 是否在矩形范围内；

实现功能

1.新建基于对话框的应用程序

2.首先创建自己的按钮类；从Cbutton派生一个自己的类classCHotBtn : public CButton ，添加几个变量UINTm_nDownPic; //鼠标按下时显示的图片 UINT m_nNomalPic; //正常情况下显示的图片

UINT m_nDisablePic; //按钮失效时显示的图片 UINT m_nMovePic; //鼠标经过按钮时显示的图片 BOOL m_bIsInRect; //鼠标是否在按钮内；并在构造函数中初始化m_nDownPic = 0; m_nNomalPic = 0; m_nDisablePic = 0; m_nMovePic = 0; m_bIsInRect = FALSE;

3.添加函数PreTranslateMessage()

reSubclassWindow(); OnTimer(); DrawItem();

BOOL CHotBtn::PreTranslateMessage(MSG* pMsg)
{
if(pMsg->hwnd==this->GetSafeHwnd()&&pMsg->message==WM_KEYDOWN && pMsg->wParam==13)
{
pMsg->lParam = 0;
pMsg->message = WM_LBUTTONDOWN;
}
if(pMsg->hwnd==this->GetSafeHwnd()&&pMsg->message==WM_KEYUP && pMsg->wParam==13)
{
pMsg->lParam = 0;
pMsg->message = WM_LBUTTONUP;
}
return CButton::PreTranslateMessage(pMsg);

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void CHotBtn::PreSubclassWindow()
{
ModifyStyle(0,BS_OWNERDRAW,0);
SetTimer(1,10,NULL); //设置定时器
CButton::PreSubclassWindow();
}
void CHotBtn::OnTimer(UINT nIDEvent)
{
CPoint point; //声明Cpoint变量
GetCursorPos(&point); //获得鼠标位置
CRect rcWnd; //声明区域对象
GetWindowRect(&rcWnd); //获得按钮区域
if(rcWnd.PtInRect(point)) //判断鼠标是否在按钮上
{
if(m_bIsInRect == TRUE) //判断鼠标是否一直在按钮上
goto END; //跳转到标记
else //鼠标移动到按钮上
{
m_bIsInRect = TRUE; //设置m_IsInRect变量值
Invalidate(); //重绘按钮
}
}
else //不在按钮区域内
{
if(m_bIsInRect == FALSE) //判断鼠标一直在按钮外
goto END; //跳转到标记
else //鼠标移动到按钮外
{
Invalidate(); //重绘按钮
m_bIsInRect = FALSE; //设置m_IsInRect变量值
}
}
END: CButton::OnTimer(nIDEvent); //设置标记，调用基类方法
}

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//设置背景透明
dc.SetBkMode(TRANSPARENT);
//创建一个位图画刷
CBrush brush(m_color);
dc.SelectObject(&brush);
CPen pen(PS_NULL,1,m_color);
dc.SelectObject(&pen);
if(m_bSetToPol) dc.Polygon(m_arrays,m_nNum);
else dc.Ellipse(0,0,rect.Width(),rect.Height());
if(m_bIsPressed)
{
CPen pen(PS_DASHDOTDOT,2,RGB(0,0,0));
dc.SelectObject(&pen);
if(m_bSetToPol)
{
dc.MoveTo(m_arrays[0]);
for(int i=1;i<m_nNum;i++)
{ dc.LineTo(m_arrays[i]);
}
dc.LineTo(m_arrays[0]);
}
else dc.Ellipse(0,0,rect.Width(),rect.Height());
}
else
{
CPen pen(PS_DASHDOTDOT,2,m_color);
dc.SelectObject(&pen);
if(m_bSetToPol)
{
dc.MoveTo(m_arrays[0]);
for(int i=1;i<m_nNum;i++)
{ dc.LineTo(m_arrays[i]);
}
dc.LineTo(m_arrays[0]);
}
else dc.Ellipse(0,0,rect.Width(),rect.Height());
}

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void CHotBtn::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{
CDC dc;
dc.Attach(lpDrawItemStruct->hDC);
UINT state = lpDrawItemStruct->itemState;
CRect rect; //声明区域对象
GetClientRect(rect);
CString text;
GetWindowText(text);
if(state & ODS_DISABLED)
{
DrawBK(&dc,m_nDisablePic);
dc.SetTextColor(RGB(0,0,0));
}
else if(state&ODS_SELECTED)
{
DrawBK(&dc,m_nDownPic);
dc.SetTextColor(RGB(0,0,255));
}
else if(m_bIsInRect==TRUE)
{
DrawBK(&dc,m_nMovePic);
dc.SetTextColor(RGB(255,0,0));
}
else //默认情况下
{
DrawBK(&dc,m_nNomalPic);
dc.SetTextColor(RGB(0,0,0));
}
if(state&ODS_FOCUS)
{
CRect FocTect(rect);
FocTect.DeflateRect(2,2,2,2);
dc.DrawFocusRect(&FocTect);
lpDrawItemStruct->itemAction = ODA_FOCUS ;
}
dc.SetBkMode(TRANSPARENT);
dc.DrawText(text,&rect,DT_CENTER|DT_VCENTER|DT_SINGLELINE);
}

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<div style="text-align: center;"><font size="4">4再添加背景自绘函数DrawBK() 及对外接口函数SetBkBitmap()</font></div>void CHotBtn::DrawBK(CDC *pDC, UINT ResID)
{
if(m_nDownPic&&m_nNomalPic&&m_nDisablePic&&m_nMovePic)
{
CDC memDC;
memDC.CreateCompatibleDC(pDC);
CRect rect; //声明区域对象
GetClientRect(rect); //获得编辑框客户区域
CBitmap bitmap;
BITMAP bitStruct;
bitmap.LoadBitmap(ResID);
bitmap.GetBitmap(&bitStruct);
memDC.SelectObject(&bitmap);
pDC->StretchBlt(0,0,rect.Width(),rect.Height(),&memDC,0,0,bitStruct.bmWidth
,bitStruct.bmHeight,SRCCOPY);
memDC.DeleteDC();
bitmap.DeleteObject();
}
}
void CHotBtn::SetBkBitmap(UINT nDownPic,UINT nNomalPic,UINT nDisablePic,UINT nMovePic)
{
m_nDownPic = nDownPic; //鼠标按下时显示的图片
m_nNomalPic = nNomalPic; //正常情况下显示的图片
m_nDisablePic = nDisablePic; //按钮失效时显示的图片
m_nMovePic = nMovePic; //鼠标经过按钮时显示的图片
}