UI: Code Quality Improvements - Low-Hanging Fruits to be Discussed #73781
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UI: Code Quality Improvements - Low-Hanging Fruits to be Discussed
There are many major issues with the quality of our UI code. The argument can be made that much of it is due for a complete rewrite. Such a rewrite is not a short-term goal though. For that reason we should try addressing some low-hanging fruits within regular development.
The following isn't a complete list of low hanging fruits. It's more of an initial idea list.
Reducing
bContext
dependenciesbContext
provides a handy way of passing around state information. The UI code probably relies too much on it though:wmWindow *
andbContext *
(itself also including awmWindow *
) - which window should be used? Can we rely on them being the same, or when do they differ?Ideally, I think context should only be passed to high-level operator, drawing or handler functions and the like. These should then read out needed data from context and use that to perform actions on this data as input. In-between these callbacks there should not be any access to the context.
Plan of action:
bContext *
usage in lower level functions or we it can be easily avoided (see P1250).wmWindow
,bScreen
,ScrArea
, etc.).Maybe we should also look into only actually creating a context when it's needed for callbacks. Making that easy and reliable isn't a low-hanging fruit though.
Push/pop
bContext
semanticsThere are more and more places where we temporarily override context members, which always follows the same pattern. It's a good idea to generalize this, for esthetical reasons but also to prevent errors (e.g. single variables not reset in certain execution paths). We could introduce a simple and lightweight static context stack with push and pop calls to wrap any temorary overrides.
Naming conventions
I'd like to point out a pitfall that I still stumble over occasionally after six years: the naming conventions for
ARegion
-ar
andScrArea
-sa
. When trying to access an area, it easy to mistakenly typear
, which refers to the region instead.We should avoid such ambiguous names. We should also avoid abbreviations, esp. extreme ones, for variables with non-small scope. That should further remove ambiguity and make code more readable.
For example:
ARegion
ar
region
ScrArea
sa
area
bScreen
sc
,scr
screen
PanelType
pt
panel_type
MenuType
mt
menu_type
HeaderType
ht
header_type
ColorBand
coba
color_band
ExtensionRNA
ext
rna_extension
int
x1
,x2
,y1
,y2
xmin
,width
,ymin
,height
Note that all these examples can be changed without touching DNA (afaics).
Ghost C++11 features
Ghost probably wouldn't benefit too greatly from modern C++ usage, but there are a few features that might be handy. Changes proposed here should move us closer to following the C++ guidelines: http://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines.
If in future we add more C++ to our UI code, we should follow the same rules.
override
,virtual
andfinal
keywords: Explicit usage of these terms in class hierarchies may prevent some errors. Especiallyoverride
andfinal
since they lead to a compile error on function signature mismatch (C.128).std::unique_ptr
: It's considered good practise to use smart pointers (esp.std::unique_ptr
) to manage lifetimes of C++ objects. They make object ownership explicit and enforce static sanity checks. ([R.1]], http:*isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#Rr-newdelete , [http://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#Rr-owner | R.20). We may want to add our ownmake_unique()
too, which is only available in C++17.default
anddelete
constructors and destructors: Using these may help catch some errors at compile time, make classes more compatible withstd
containers and allows optimizations for trivial operation (e.g. a= default
copy constructor makes a type "trivially copyable", which some containers and compilers optimize for) ([C.43]], http:*isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#Rc-eqdefault , [http://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#Rc-delete | C.81).std
containers in a few places. C++11 range-based for loops make iterating them far less verbose (ES.71).auto
to avoid verbosity/redundancy: While there are good reasons to be sceptical aboutauto
, there are few cases where they are definitely useful. For example in case of long type names (likestd::vector<std::unique_ptr<SomeType>>::const_iterator
). (ES.11)using
overtypedef
: Theusing
syntax to create aliases is often considered more readable. (T.43).nullptr
: More on the esthetical side of things (although may avoid some nasty surprises!), but we should use standardnullptr
instead ofNULL
. We can avoid includingstddef.h
everywhere then. (ES.47)Other, similar improvements are possible. These are just a few examples of low hanging fruits.
Various
PointerRNA
&PropertyRNA
,wmOperatorType
&PointerRNA
,ScrArea
&ARegion
).uiBut
contains data that only applies to certain button-types.uiButTab
is an example of how this can be avoided.uiBut.editstr
,uiBut.editval
,uiBut.editvec
, etc, it could beuiBut.edit_values.foo
.foo(true, false, false)
is cumbersome to use (what does each boolean mean) and leads to mistakes (using wrong order of booleans). It's better to be explicit what each value refers to by using enum types. Bitflags are also an option.const
where applicableAdded subscribers: @JulianEisel, @brecht, @ideasman42
Added subscriber: @HooglyBoogly
Coudl this be split into multiple proposals? Each are large enough to have own discussion which will get mixed up in a single task.
Changed status from 'Needs Triage' to: 'Confirmed'
Changed status from 'Confirmed' to: 'Archived'
Split into multiple tasks: #74430 (UI Code Quality: Ghost C++ Coding-Style), #74429 (UI Code Quality: bContext Management), #74432 (UI Code Quality: General, Smaller Changes). If needed we can split them further.
We could leave this open as a parent task, but we can also use #73586 for that. Closing this one for now.