c++ WINAPI如何只运行一次鼠标事件?

Question

这段代码在我的无窗口框架中是一个像按钮一样的区域，但是有些代码我想只运行一次，直到鼠标下次移动到该区域。所有这些代码都在WM_MOUSEMOVE中。

int ClickAreaPtInfo(HWND hWnd, int x, int y, int sizex, int sizey, LPARAM lParam,int &value)
{
POINT pt;
pt.x = LOWORD(lParam);
pt.y = HIWORD(lParam);
RECT rect;
GetClientRect(hWnd, &rect);
RECT  rc = { x,y,x + sizex,y + sizey };
if (PtInRect(&rc, pt))
{
value = 1;
return -1;
}
else
{
value = 0;
return -1;
}
return -1;
}
int _CreateMouseEvent(HWND hWnd, int x, int y, int sizex, int sizey, LPARAM lParam,RUNFUN function(), const wchar_t* Panelid, const wchar_t* CtlName)
{
int val = 0;
int msg = 0;

//int ist = 0;            int istprev = 0;
RECT winrc;
GetClientRect(hWnd, &winrc);
RECT rc;
RectTypeConvert(rc,x, y, sizex, sizey);
if (Panelid == PanelID)
{
int nst = 1;
//OutputDebugString(L"HOVER!n");
msg = 1;
ClickAreaPtInfo(hWnd, x, y, sizex, sizey, lParam, val);
if (val == 1)
{
if (ClickMsg == 1) //Click(Get from WM_LBUTTONUP)
{
ClickMsg = 0;
function();
}
else
{
//It must be run for only once until the mouse leave next time,or it will  lead to a lot of resource occupation
if (CtlName == L"Button") //HOVER
{
if (nst == 1)
{
HDC hdc = GetDC(hWnd);
CreateSimpleButtonEx(hWnd, hdc, x, y, sizex, sizey, UICOLOR_GREENSEA, 1, ButtonText);
ReleaseDC(hWnd, hdc);
nst = 0;
return 0;
}
else
{
nst = 0;
return 0;
}
return 0;
}
if (CtlName == L"CloseButton") ///HOVER
{
if (nst == 1)
{
HDC hdc = GetDC(hWnd);
CreateRect(hWnd, hdc, x, y, sizex, sizey, UICOLOR_PEACHRED);
PanelDrawCloseBtn(hWnd, hdc, rc.right - 40, 0, 40, 40, 12, UICOLOR_WHITE);
ReleaseDC(hWnd, hdc);
nst = 0;
return 0;
}
else
{
nst = 0;
return 0;
}
return 0;
}
else
{
return 0;
}
}
}
if (val == 0) //Leave
{
nst = 1;
InvalidateRect(hWnd, &rc, 0); //It must be run for only once until the mouse leave next time,or it will  lead to a lot of resource(CPU) occupation

}
}
if (Panelid == PrevPanelID)
{
msg = 1;
}
else
{
msg = 0;
}

return 0;
}

then handle CreateMouseEvent in WM_MOUSEMOVE:

case WM_MOUSEMOVE:
{
CreateMouseEvent(hWnd, 20, 60, 140, 40, lParam, test, L"Init",L"Button");
CreateMouseEvent(hWnd, 20, 120, 140, 40, lParam, test3, L"Init", L"Button");
CreateMouseEvent(hWnd, 20, 180, 140, 40, lParam, btn3, L"Init",L"Button");
CreateMouseEvent(hWnd, rc.right - 40, 0, 40, 40, lParam, CloseWindow, L"Init",L"CloseButton");
break;
}

我也会给这个问题一个图片!http://db.vertexstudio.xyz/lnk/PanelPic/debuginf.png

解决方案吗?谢谢!

Answer 1

你的一些问题已经在上面提到过了。

在你的例子中有一些变量没有定义，既不是类型也不是值，但我至少可以推断出一些。

同样，在一些地方，你试图直接比较一个C风格的字符串指针(不是std::string!)和另一个C风格的字符串指针。

if (Panelid == PanelID) is one place

if (CtlName == L"Button") //HOVER  === is another
if (CtlName == L"CloseButton") ///HOVER another

你可以使用int _wcsnicmp( const wchar_t *string1,const wchar_t *string2, size_t count);或者任何你的编译器支持的东西。也可以直接使用std::wstring

至于点击，你需要保存你用GetClientRect(hWnd, &winrc);得到的rect，它需要持久性，即保存在函数之外并可访问。然后与这个矩形进行比较，并做出相应的动作。