I am trying to write a compound component which is derived from TDummy. The component source is:
TMyObjectType=(otCube,otSphere);
TMyGameObject=class(TDummy)
private
FObj:TCustomMesh;
FMyObjectType: TMyObjectType;
procedure SetMyObjectType(const Value: TMyObjectType);
public
constructor Create(AOwner:TComponent);override;
destructor Destroy;override;
property MyObjectType:TMyObjectType read FMyObjectType write SetMyObjectType;
end;
{ TMyGameObject }
constructor TMyGameObject.Create(AOwner: TComponent);
begin
inherited;
MyObjectType:=otCube;
end;
destructor TMyGameObject.Destroy;
begin
FObj.Parent.RemoveObject(FObj);
FreeAndNil(FObj);
inherited;
end;
procedure TMyGameObject.SetMyObjectType(const Value: TMyObjectType);
begin
FMyObjectType := Value;
if(Assigned(FObj))then begin
FObj.Parent.RemoveObject(FObj);
FreeAndNil(FObj);
end;
case FMyObjectType of
otCube: FObj:=TCube.Create(Self);
otSphere: FObj:=TSphere.Create(Self);
end;
FObj.SetSubComponent(True);
FObj.Parent:=Self;
end;
after I register the component and put one instance on a TViewport3D in the code of a Tbutton I try to change the MyObjectType to otSphere.
MyGameObject1.MyObjectType:=otSphere;
but it seems there is nothing happening. So I wrote a piece of code as fallow.
procedure MyParseObj(obj:TFmxObject;var s:string);
var
i: Integer;
a:string;
begin
s:=s+obj.ClassName+'(';
a:='';
for i := 0 to obj.ChildrenCount-1 do begin
s:=s+a;
MyParseObj(obj.Children.Items[i],s);
a:=',';
end;
s:=s+')'
end;
and call it in another button.
procedure TForm1.Button2Click(Sender: TObject);
var s:string;
begin
s:='';
MyParseObj(myGameObject1,s);
ShowMessage(s);
end;
the result was strange. if I press the button2 result is: TMyGameObject(TCube(),TCube())
and when I press the button1 and after that press button2 result is: TMyGameObject(TCube(),TSphere())
why there is two TCustomMesh as child in my object? (TCube and TSphere are derived from TCustomMesh) how can I fix this?
and there is another test that I performed. if I create the object not in design time it work properly. problem happens if I put an instance of TMyGameObject in design time.
