Delphi让窗体感知鼠标的进入与移出并自动隐藏与显示窗口

Delphi让窗体感知鼠标的进入与移出并自动隐藏与显示窗口

const
WM_MouseEnter = $B013;
WM_MouseLeave = $B014;
type
TfrmMain = class(TForm)
       .
       .
    Timer1: TTimer;
    procedure Timer1Timer(Sender: TObject);
protected
    procedure WMMouseEnter(var Msg: TMessage); message WM_MouseEnter;
end;
implementation
{$R *.dfm}


procedure TfrmMain.WMMouseEnter(var Msg: TMessage);
begin
if(Top<0) then
begin
    Top := 0;
    //为保证下拉窗体后呈现在最前面
    SetWindowPos(Handle,HWND_TOPMOST, 0, 0, 0, 0, SWP_NOMOVE or SWP_NOSIZE); //将窗体推到最前
    SetWindowPos(Handle,HWND_NOTOPMOST, 0, 0, 0, 0, SWP_NOMOVE or SWP_NOSIZE);//然后取消窗体最前
end;
Timer1.Enabled := True;
end;
//依赖定时器定时检查鼠标是否还在窗体范围内，这样此能避免因为快速移动鼠标而丢失MOUSELEAVE事件