On Sun, 16 Jan 2011 17:41:34 +0100 Hans-Peter Diettrich <drdiettri...@aol.com> wrote:
> Mattias Gaertner schrieb: > > > Graeme, how does the fpgui writer support circles? > > For example: > > > > object Edit1: TEdit > > AnchorSideLeft.Control = Label1 > > end > > object Label1: TLabel > > AnchorSideTop.Control = Edit1 > > end > > Same question: how does LCL streaming support this? > > Circular references are something what never should be allowed, IMO. To > me it suggests a bad design of AnchorDocking, and of AutoSize as well. Any dependency between components can create this problem. >From the layout pov the above is not a circle, because one dependency is horizontally and one is vertically. Forward references happen quite often in lfm files. For example the form's ActiveControl property references a control that is streamed after the properties. How does TReader do it: It keeps a list of open references and sets them as soon as the component is created. One simple solution for the pascal writer could be: first create all components and then set the properties. But then the code is somewhat harder to read. TReader can even load multiple root components with circle dependencies. The IDE supports this too, but I guess this is hardly used and only a minor limitation for the pascal writer. Graeme, how have you solved the problem? Mattias -- _______________________________________________ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
