前因:
本來想用MFC做一個按不了的按鈕(鼠標移動到按鈕上方,按鈕就會移走),使用WM_MOUSEMOVE消息發現
鼠標在按鈕上時不會給父窗口發送WM_MOUSEMOVE消息
解決辦法:
使用SetCapture()函數捕獲鼠標消息
setCapture捕獲以下鼠標事件:onmousedown、onmouseup、onclick、ondblclick、onmouseover和onmouseout
其中剛好有我們需要捕獲到的消息,不過這個函數有點霸道,捕獲期間不能做別的事件,所以需要及時釋放
釋放使用ReleaseCapture()函數
注意:
SetCapture()函數貌似需要程序擁有管理員權限
void CBiaoBai1Dlg::OnMouseMove(UINT nFlags, CPoint point)
{
// TODO: 在此添加消息處理程序代碼和/或調用默認值
CDialogEx::OnMouseMove(nFlags, point);
//設置鼠標捕獲
SetCapture();
//獲取不同意按鈕位置(相對於顯示屏左上角的)
CRect rect_disagree;
m_Disagree_Button.GetWindowRect(&rect_disagree);
//獲取同意按鈕位置
CRect rect_agree;
m_agree.GetWindowRect(&rect_agree);
//獲取考慮按鈕位置
CRect rect_think;
m_think.GetWindowRect(&rect_think);
//獲取不同意按鈕寬和高
int height = rect_disagree.Height();
int width = rect_disagree.Width();
//將客戶端坐標轉換為屏幕坐標
ClientToScreen(&point);
//判斷鼠標是否落在同意與考慮按鈕上
//如果落在他們上,就釋放鼠標捕獲
if (rect_agree.PtInRect(point) || rect_think.PtInRect(point))
{
//釋放鼠標捕獲
ReleaseCapture();
}
rect_disagree.NormalizeRect();
BOOL ret = PtInRect(rect_disagree,point);
if (ret)
{
//獲取客戶端大小
CRect rect;
GetClientRect(&rect);
//確定隨機移動的范圍在客戶端內
//如果落在同意與考慮按鈕上就再次隨機
int re_x;
int re_y;
CPoint point_youxia;
CPoint point_youshang;
CPoint point_zuoxia;
do
{
re_x = rand() % (rect.right - width);
re_y = rand() % (rect.bottom - height);
point.SetPoint(re_x, re_y);
//將客戶端坐標轉換為屏幕坐標
ClientToScreen(&point);
point_youxia.SetPoint(point.x + width, point.y + height);
point_youshang.SetPoint(point.x + width, point.y);
point_zuoxia.SetPoint(point.x, point.y + height);
} while (rect_agree.PtInRect(point) || rect_think.PtInRect(point)
|| rect_agree.PtInRect(point_youxia) || rect_think.PtInRect(point_youxia)
|| rect_agree.PtInRect(point_youshang) || rect_think.PtInRect(point_youshang)
|| rect_agree.PtInRect(point_zuoxia) || rect_think.PtInRect(point_zuoxia));
rect.SetRect(re_x, re_y, re_x + width, re_y + height);
m_Disagree_Button.MoveWindow(&rect, TRUE);
}
}
