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Subclass for form |
Sun, Nov 1 2015 5:28 PM | Permanent Link |
Christian Kaufmann | I try this:
// For this class I have a .wbf file TFViewEntryIndividual = class(TForm) protected procedure Init; virtual; abstract; end; // then I define two sub classes TFViewEntryIndividualByAthlete = class(TFViewEntryIndividual) protected procedure Init; override; end; TFViewEntryIndividualByEvent = class(TFViewEntryIndividual) protected procedure Init; override; end; The reason for this is, I just register view classes (class of TForm) and depending on the menu click, the objects are created on the fly. The code above fails because the usage of ClassName in TFormControl.LoadFromResource. Unfortunately I didn't find a solution where I can work with "reference to function". I just can create a list of classes and then my generic code for the menu item click looks like this: procedure TFMain.SideMenuClick(Sender: TObject); var l : TBSMenuLabel; begin l := TBSMenuLabel(Sender); l.Selected := True; if Assigned(FView) then FView.Free; FView := FViews[l.Tag].Create(Self); end; FViews is an array of "class of TFormControl". Any suggestions on how this could be solved? ` cu Christian |
Mon, Nov 2 2015 2:13 PM | Permanent Link |
Tim Young [Elevate Software] Elevate Software, Inc. timyoung@elevatesoft.com | Christian,
<< The code above fails because the usage of ClassName in TFormControl.LoadFromResource. >> Yes, there's really no way around this - the class name dictates which form resource to load. << Unfortunately I didn't find a solution where I can work with "reference to function". >> In EWB, you can use references to functions/procedures in the same way as you can method references: http://www.elevatesoft.com/manual?action=viewtopic&id=ewb2&topic=Type_Declarations (the last example) EWB uses an array of function references for the animation easing calculations. Tim Young Elevate Software www.elevatesoft.com |
Mon, Nov 2 2015 2:48 PM | Permanent Link |
Christian Kaufmann | Tim Young [Elevate Software] wrote:
> In EWB, you can use references to functions/procedures in the same way as you can method > references: > > http://www.elevatesoft.com/manual?action=viewtopic&id=ewb2&topic=Type_Declarations > > (the last example) Sounds good. But it seems, it doesn't work with class methods. I tried this: TBSViewPanel = class(TFormControl) public class function GenerateView(AOwner: TComponent): TBSViewPanel; virtual; end; TBSViewGenerateFunc = function(AOwner: TComponent): TBSViewPanel; TMyView = class(TBSViewPanel) ... end; Now TMyView.GenerateView is not accepted as parameter of type TBSViewGenerateFunc. [Error] main.wbs (148,3): There is no function or procedure declaration that matches the RegisterMenu(MEntry, TFViewEntryMeet.GenerateView()) reference Does it have to be a global method? cu Christian |
Mon, Nov 2 2015 3:10 PM | Permanent Link |
Tim Young [Elevate Software] Elevate Software, Inc. timyoung@elevatesoft.com | Christian,
<< Now TMyView.GenerateView is not accepted as parameter of type TBSViewGenerateFunc. >> Please post all of the code relevant to what you're trying to do, especially the actual RegisterMenu call. Tim Young Elevate Software www.elevatesoft.com |
Mon, Nov 2 2015 3:12 PM | Permanent Link |
Tim Young [Elevate Software] Elevate Software, Inc. timyoung@elevatesoft.com | Christian,
Actually, never mind - I spotted the issue. You forgot the "of object" part for your method type declaration: TBSViewGenerateFunc = function(AOwner: TComponent): TBSViewPanel of object; <<<<<<<<< Tim Young Elevate Software www.elevatesoft.com |
Mon, Nov 2 2015 4:04 PM | Permanent Link |
Christian Kaufmann | Tim Young [Elevate Software] wrote:
> > TBSViewGenerateFunc = function(AOwner: TComponent): TBSViewPanel of object; <<<<<<<<< > Thanks. cu Christian |
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