On Sun, 16 Jan 2011 18:31:01 +0100 (CET) Michael Van Canneyt <mich...@freepascal.org> wrote:
> > > On Sun, 16 Jan 2011, Mattias Gaertner wrote: > > > 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. > > TForm/TDatamodule dependencies are in this category, and not so uncommon. Normally only the form references the Datamodule, so you can simply create the module before the form. I meant, that TReader and IDE even support bidirectional references. AFAIK not many programs use this. > > Graeme, how have you solved the problem? > > He has not. > I don't know of any inter-component property in fpGUI, > except parent (which must be equal to Owner anyway). Ah, well, that is a simple solution. ;) Mattias -- _______________________________________________ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
