prism | prism window manager
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QUESTION
I have a function called:
...ANSWER
Answered 2022-Mar-19 at 18:11I'm not familiar with the idioms for that package, but I'd be tempted to use castOptic equality
to turn the identity Iso
into a Prism
. That seems to get the idea across pretty well. However, I would expect that in most contexts you wouldn't actually need to convert it to a Prism
; you can presumably use polymorphic functions (like preview
and review
) that will accept an Iso
as well as a Prism
.
In your case, I suspect the right approach would be to write something like
QUESTION
I'm unable to automatically derive instances using DerivingVia
on any type that uses types from optics-core
like Prism'
; the error I get from compiler is:
ANSWER
Answered 2022-Mar-15 at 23:46Generally speaking, profunctor optics (such as those used in the lens
and optics
packages) aren't directly coercible. Roughly speaking, the internal representation of a prism is something like:
QUESTION
A type Prism' s a = Prism s s a a
(hackage) can be thought of as a relation between some structure s
and its member a
, such that you can always produce the structure from the member (a -> s
), but can only optionally retrieve the member from the structure (s -> Maybe a
).
This model is helpful in relating a sum type to one of its constructors ... as well as (more relevant here) in route encoding and decoding. If s
is the encoded route URL, and a
is the route type, then we have a -> s
representing the encoding function (always succeeds), and s -> Maybe a
representing the decoding function (can fail).
Now, on to these pairs of functions, I want to add a "context" argument that is to be used in the encoding and decoding process (imagine that the decoding process needs to "look up" some database before successfully producing a relevant route). Basically:
...ANSWER
Answered 2022-Mar-15 at 15:18I'm with @HTNW. You should just be able to define:
QUESTION
I use JavaFX with Java 8 and i set this properties before launching my app
System.setProperty("prism.forceGPU","true");
System.setProperty("prism.order","d3d,sw");
The verbose mode for prism gives me this :
ANSWER
Answered 2022-Mar-09 at 05:23For those who are trying to solve a similar issue, it might be coming from the java.exe executable not using the gpu you want as a default device, you can change that in Windows' settings.
QUESTION
I am trying to access a nested record using lenses and prisms in Haskell:
...ANSWER
Answered 2022-Mar-01 at 21:09Updated: As per comments, I've fixed some errors and added a few asides in [[double square brackets]].
Here's how/why your first mMistake
works...
A prism is an optic that focus on a "part" that may or may not be present in the "whole". [[Technically, it focuses on the sort of part that can be used to reconstruct an entire whole, so it really pertains to a whole that can come in several alternative forms (as in the case of a sum type), with the "part" being one of those alternative forms. However, if you're only using a prism for viewing and not setting, this added functionality isn't too important.]]
In your example, both _StateRun
and _Just
are prisms. The _Just
prism focuses on the a
part of a Maybe a
whole. Such an a
may or may not be present. If the Maybe a
value is Just x
for some x :: a
, the part a
is present and has value x
, and that's what _Just
focuses on. If the Maybe a
value is Nothing
, then the part a
is not present, and _Just
doesn't focus on anything.
It's somewhat similar for your prism _StateRun
. If the whole StateStep
is a StateRun x y
value, then _StateRun
focuses on that "part", represented as a tuple of the fields of the StateRun
constructor, namely (x, y) :: (Int, Maybe Text)
. On the other hand, if the whole StateStep
is a StatePause
, that part isn't present, and the prism doesn't focus on anything.
When you compose prisms, like _StateRun
and _Just
, and lenses, like stStep
and _2
, you create a new optic that combines the composed series of focusing operations.
[[As was pointed out in the comments, this new optic isn't a prism; it's "only" traversal. In fact, it's a specific kind of traversal, called an "affine traversal". A run-of-the-mill traversal can focus on zero or more parts, while an affine traversal focuses on exactly zero (part not present) or one (unique part present). The lens
library doesn't make the distinction between affine traversals and other sorts of traversals, though. The reason the new optic is "only" an affine traversal instead of a prism relates to that earlier technical point. Once you add lenses, you remove your ability to reconstruct the entire "whole" from a single "part". Again, if you're only using the optics for viewing, not setting, it won't really matter.]]
Anyway, consider the optic (affine traversal):
QUESTION
here is a puzzle that I keep on bumping into and that, I believe, no previous SO question has been addressing: How can I best use the lens
library to set or get values within a State
monad managing a nested data structure that involves Map
s when I know for a fact that certain keys are present in the maps involved?
ANSWER
Answered 2022-Feb-09 at 11:43If you are sure that the key is present then you can use fromJust
to turn the Maybe User
into a User
:
QUESTION
I am conducting a study of a number of patients with a disease, and using an ordinal scale assessment of functional status at 3 different time points. I want to connect multiple groups in stacked bar charts across these time points.
I looked at these topics and havent gotten it to work using these suggestions:
How to position lines at the edges of stacked bar charts
Draw lines between different elements in a stacked bar plot
Please see the graphical representation of how I ultimately want this figure to look from R (generated in PRISM) of the frequencies of each of these 6 ordinal values across the three time points (top group has no patients with ordinal score 3,5,6):
Data:
...ANSWER
Answered 2022-Jan-24 at 17:15I don't think there is an easy way of doing this, you'd have to (semi)-manually add these lines yourself. What I'm proposing below comes from this answer, but applied to your case. In essence, it exploits the fact that geom_area()
is also stackable like the bar chart is. The downside is that you'll manually have to punch in coordinates for the positions where bars start and end, and you have to do it for each pair of stacked bars.
QUESTION
I'd like to use Prism in a WinUI 3 app, and I saw the Prism v8.1 release.
Additionally Prism 8.1 offers a new Prism.Uno.WInUI platform target for those wishing to build either native WinUI3, or Cross Platform WinUI 3 apps with Uno Platform.
I'm confused about Uno. I'm not using Uno, can I still use Prism in a WinUI 3 app without using Uno?
If yes, which packages do I need to install and in which projects? (I'd like to use DryIoc)
I guess Prism.DryIoc.Uno.WinUI must be added to the WinUI 3 app project.
But what about the other packages for using Prism?
...ANSWER
Answered 2022-Jan-10 at 12:59If you specifically want to use 'Dryloc', you could try to use one of these Nuget packages:
- Prism.Container.Extensions
- Prism.DryIoc.Extensions
They should both be of general use and not target a specific UI technology.
If you install 'Prism.DryIoc.Extensions' using the Nuget-Package manager, dependent packages should be installed automatically.
See Github - Prism.Container.Extensions
Note there is also a package 'Prism.Core' that does not target a specific UI framework either. If contains features like an event aggregator.
QUESTION
I have built my app with JavaFX 11 and now I need to distribute it. I have chosen to distribute it in two ways: cross-platform fat-jar (I know, I know, it is discouraged, but that is not the point) and platform specific image created with jlink.
I am building on Linux Mint 20.1. I am using Maven and creating runtime image with javafx-maven-plugin
. I have JDKs for both platforms on my Linux machine and pointed to the corresponding jmods
folder in pom.xml
.
The built fat-jar works on both Linux and Windows where both have installed the latest Java SDK (11.0.12).
The image for Linux also works without problems.
However, the image for Windows does not run and the output of -Dprism.verbose=true
is this:
ANSWER
Answered 2021-Oct-17 at 17:16java.lang.UnsatisfiedLinkError: no prism_sw in java.library.path
Means you're definitely missing some dlls from your library path, although this could only be a part of the problem.
When you download javafx sdk for windows from this link, you get a zip with the following structure:
The bin folder contains all the natives you need to run JavaFx (on windows, or the platform you downloaded the sdk for)
Note that you don't always need all the natives, jfxwebkit.dll for example is only needed when you work with javafx-web.
You need to extract them somewhere and add the folder you extracted them in to the library path when you run the java program
QUESTION
I've been stuck on this error now for a few days. I've googled the heck out it and tried at least a dozen different proposed solutions in various forms...
My project runs fine, UNTIL I attempt to use a specific library called MonacoFX, which, according to the GitHub page, was developed in Java 13 (I'm using Java 16.0.1 for this project). The documentation for the library is straight forward, you instantiate the library like you do with most libraries, then you simply use it. However, as soon as I attempt to instantiate it, I get this error at runtime:
...ANSWER
Answered 2021-Oct-31 at 01:43How to debug dependencies
Include the maven dependency plugin in your project.
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