我試圖檢測鼠標輸入/離開消息CM_MOUSEENTER
和CM_MOUSELEAVE
但它沒有捕捉到它。我在這裏做錯了什麼?鼠標輸入/離開消息不起作用?
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;
我的第一個評論是不使用斷點來監測這些東西。切換到調試器時,UI交互總是搞砸了。使用類似Codesite的東西將消息發送到另一個窗口,並確保在監視時不要改變焦點。 – mj2008