我正在尝试检测鼠标进入/离开消息CM_MOUSEENTER
和CM_MOUSELEAVE
,但它没有抓住它。我在这里做错了什么?
type
TMyControl = class(TCustomControl)
private
procedure CMMouseEnter(var Message: TMessage); message CM_MOUSEENTER;
procedure CMMouseLeave(var Message: TMessage); message CM_MOUSELEAVE;
procedure WMNCHitTest(var Message: TWMNCHitTest); message WM_NCHITTEST;
end;
procedure TMyControl.CMMouseEnter(var Message: TMessage);
begin
//Handle mouse entering
//Breakpoint never reached, procedure never called
end;
procedure TMyControl.CMMouseLeave(var Message: TMessage);
begin
//Handle mouse leaving
//Breakpoint never reached, procedure never called
end;
procedure TMyControl.WMNCHitTest(var Message: TWMNCHitTest);
var
Ch: Bool;
begin
if csDesigning in ComponentState then
Message.Result := HTCLIENT
else begin
Ch:= False;
//Do checks and pass `Ch:= True;` if something changed...
if Ch then Invalidate;
end;
end;
答案 0 :(得分:7)
我想出了我的问题:我也在使用WM_NCHITTEST
,我没有通过inherited;
。我添加了这个,现在它工作正常。