【发布时间】：2021-11-24 00:09:08
【问题描述】：
我的无窗口框架中的这段代码是一个类似于按钮的区域，但有些代码我只想运行一次，直到鼠标下次移动到该区域为止。 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;
}
然后在 WM_MOUSEMOVE 中处理 CreateMouseEvent：
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;
}
而且我也会给这个问题一个图片！ http://db.vertexstudio.xyz/lnk/PanelPic/debuginf.png
任何解决方案？谢谢！
【问题讨论】：
-
每次鼠标移到按钮上时，您都会调用
CreateSimpleButtonEx。你是故意的吗？您似乎期望局部变量nst的值会在调用之间以某种方式保留。 -
这里我只想在鼠标离开时运行一次：if (val == 0) //Leave { nst = 1; InvalidateRect(hWnd, &rc, 0); //必须只运行一次，直到下次鼠标离开，否则会导致大量资源（CPU）占用 }
-
如果我创建了一个全局变量，并且面板中有多个 MouseEvent 会导致另一个错误
-
所以你需要设计一种方法来为每个按钮单独维护持久状态。
-
基本上，您想要实现假设的
WM_MOUSEENTER消息。请参阅Why is there no WM_MOUSEENTER message? 了解如何做到这一点。