Find declaration with interfaces
lazarus / 9-Editor

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kokesssss · 2016-10-27 13:05

Hi,

I'm using pascal interfaces in my new project heavily, which turns
code navigation feature to be a bit annoying. When I call an object
instance method via interface and do a ctrl+click on that call, it
shows be the method declaration in interface (which is logical but not
practical).

Eclipse (for example) has a feature called Quick type hierarchy, which
shows implementations of given interface method. It also has Open
implementation feature, which brings a dialog where user selects which
implementation of interface method he wants to jump to.

Do someone know about a way how to do something similar in Lazarus?
Either natively, via package or via some workaround?

Thanks

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Thaddy · 2016-10-27 13:14

ctrl-shift-downarrow jumps to implementation. ctrl-shift-uparrow jumps
back to the interface section for a given piece of code..
Even if inside a procedure, function or method body, which I think
even eclipse can't do.. (eclipse is much younger)

ctrl-space or ctrl-j will open a searchable dropbox.....

Code navigation is way better than in eclipse   and much, much
faster....

Project inspector and components inspector also have powerful filtered
search/navigate options.....

This is all very well documented.

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kokesssss · 2016-10-27 13:27

Thanks, I know these shortcuts, the question is about different kind
of interface  Let me add a code example:

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i  Type  IFoo
= Interface    [SOME_GUID];     Procedure Foo;    Procedure Bar; 
End;   TFirst = Class(TObject, IFoo)    Procedure Foo;    Procedure
Bar;  End;   TSecond = Class(TObject, IFoo)    Procedure Foo;   
Procedure Bar;  End; // Implementation of the methods is irrelevant,
ommiting them// Now some procedure using the interface Procedure
Test(aFoo: IFoo);Begin  aFoo.Bar;End;  
When I ctrl+click or run FindDeclaration on Bar word in procedure
Test, code navigator puts me on the Procedure Bar; line in IFoo
declaration. Ctrl+shift+arrow does nothing, because there's no
procedure implementation - it's an interface.

I'd like to show existing implementations of method Bar and choose
where to jump - to TFirst.Bar or TSecond.Bar. That's what
aforementioned quick type hierarchy does.

Is there a way?

Thanks

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Thaddy · 2016-10-27 13:31

right click on ifoo and choose find implementation, resp declaration.
Note that implementation depends on context of the implementing class
you are working on, not all implementations.

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kokesssss · 2016-10-27 13:45

Hi,

Please see the attached screenshot, no such option there. It is
Lazarus 1.6.

I also tried on the declaration and on Interface itself. All
declarations and implementations are in one file so project shouldn't
influence this by some wrong path settings/missing files.

Thx

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Thaddy · 2016-10-27 13:48

It clearly says find declaration of bar......

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kokesssss · 2016-10-27 14:08

Yes, that will find the declaration - i.e. it will jump to Procedure
IFoo.Bar declaration. But I'd like to see somehow a list of
implementations of IFoo.Bar (or at least classes implementing IFoo).

Right clicking on IFoo and selecting Find declaration of IFoo tells
Error: identifier not found: IFoo.

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kokesssss · 2016-10-27 14:14

Eclipse example showing what I'd like to achieve. I'm looking for some
similar feature, need not to be the same (and need not to be that slow
like in eclipse ;-) )

Thanks