DisplayLink | Per-frame actions for SwiftUI | Frontend Framework library

 by   timdonnelly Swift Version: 0.2.0 License: BSD-2-Clause

kandi X-RAY | DisplayLink Summary

kandi X-RAY | DisplayLink Summary

DisplayLink is a Swift library typically used in User Interface, Frontend Framework applications. DisplayLink has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

A simplified DisplayLink abstraction for all platforms (including iOS, tvOS, watchOS, macOS, Linux). Includes a Combine publisher with SwiftUI integration for CADisplayLink.
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            kandi-support Support

              DisplayLink has a low active ecosystem.
              It has 37 star(s) with 1 fork(s). There are 2 watchers for this library.
              OutlinedDot
              It had no major release in the last 12 months.
              There are 0 open issues and 1 have been closed. There are no pull requests.
              It has a neutral sentiment in the developer community.
              The latest version of DisplayLink is 0.2.0

            kandi-Quality Quality

              DisplayLink has 0 bugs and 0 code smells.

            kandi-Security Security

              DisplayLink has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              DisplayLink code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              DisplayLink is licensed under the BSD-2-Clause License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              DisplayLink releases are available to install and integrate.
              Installation instructions are not available. Examples and code snippets are available.

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            DisplayLink Key Features

            No Key Features are available at this moment for DisplayLink.

            DisplayLink Examples and Code Snippets

            DisplayLink
            Swiftdot img1Lines of Code : 27dot img1License : Permissive (BSD-2-Clause)
            copy iconCopy
            public final class DisplayLink : Publisher {
                public typealias Output = Frame
                public typealias Failure = Never
            }
            
            extension DisplayLink {
                public struct Frame {
                    public var timestamp: TimeInterval
                    public var duration: TimeInt  

            Community Discussions

            QUESTION

            How to animate a view in a circular motion using its real-time position coordinates?
            Asked 2022-Apr-16 at 04:08

            I'm currently working on a SwiftUI project, and in order to detect intersections/collisions, I need real-time coordinates, which SwiftUI animations cannot offer. After doing some research, I came across a wonderful question by Kike regarding how to get the real-time coordinates of a view when it is moving/transitioning. And Pylyp Dukhov's answer to that topic recommended utilizing CADisplayLink to calculate the position for each frame and provided a workable solution that did return the real time values when transitioning. But I'm so unfamiliar with CADisplayLink and creating custom animations that I'm not sure I'll be able to bend it to function the way I want it to.

            So this is the animation I want to achieve using CADisplayLink that animates the orange circle view in a circular motion using its position coordinates and repeats forever:

            Here is the SwiftUI code:

            ...

            ANSWER

            Answered 2022-Apr-16 at 04:08

            Inside Position you're calculating position related to whole screen. But .position modifier requires value related to the parent view size.

            You need to make your calculations based on the parent size, you can use such sizeReader for this purpose:

            Source https://stackoverflow.com/questions/71888914

            QUESTION

            I want to take user input and save it as a variable in JS for my electron application
            Asked 2022-Jan-01 at 05:25

            So I'm making my first electron app after a 7 hour js crash course and 1 semester of AP Computer Science Principles so I'm pretty new, so bare with me. Im making a shop script app in electron and I have a preliminary basic UI setup in electron with a main.js file which handles the opening of the app and UI stuff. Now I wanted to make the first content script part of the app that actually does stuff (save.js). Essentially the finished UI will have 4 user input fields and I need to take those inputs from the html input/form and save them as variables, then display them on the screen. My variables will be (link, price range, Brand, Model). From the course I took I tried to use document.getElementById in a variable and then using .textContent in an onclick function, so that when the html button is pressed it displays the user input on a section of the page. It didn't work, so I tried this approach and it still doesn't return the input into the UI. Any help is appreciated.

            Here is the save.js:

            ...

            ANSWER

            Answered 2022-Jan-01 at 05:25

            QUESTION

            Telerik Sitefinity Add Property User
            Asked 2021-Nov-16 at 17:54

            In my Sitefinity back-end there is a user section that I would like to add some setting. Something like DisplayLink where it would be a boolean value that I can set on Login of the user. Is there a way I can do that? I am using sf 14 and can't find anyway to add some setting for the user.

            ...

            ANSWER

            Answered 2021-Nov-16 at 17:54

            I believe this is what you need ...map the view externally and modify.

            However keep in mind these views pull in the XHR JSON and you just expose it to the grid... Open your console and view the XHR network traffic to see the JSON object per user. There's a "Comment" field you might be able to leverage, but man the best way would be to just use a ROLE... because they can be filtered, and already come across in that JSON.

            Another thing to note, is this is an OLD UI screen and likely will get revamped in the next few releases of Sitefinity rendering everything you're doing pointless... (have to re-do it with likely the new AdminApp Extensions)

            Source https://stackoverflow.com/questions/69993367

            QUESTION

            Batch script: extract text after/before last/first occurrence of characters and store it in array
            Asked 2021-Sep-10 at 20:00

            Suppose I have the following content in my file under "%userprofile%\~.txt":

            ...

            ANSWER

            Answered 2021-Sep-10 at 20:00

            An alternative is to make use of powershell regex to do this:

            Source https://stackoverflow.com/questions/69134343

            QUESTION

            Core Graphics with DisplayLink Unexpected Behavior
            Asked 2021-Jul-01 at 22:35

            I'm trying to learn Core Graphics and am having trouble understanding the behavior of the code I've written, which uses a subclassed UIView and an override of the draw(_ rect:) function.

            I've written a basic bouncing ball demo. Any number of random balls are created with random position and speed. They then bounce around the screen.

            My issue is the way that the balls appear to move is unexpected and there is a lot of flicker. Here is the sequence inside for loops to iterate through all balls:

            1. Check for collisions.
            2. If there is a collision with the wall, multiply speed by -1.
            3. Increment ball position by ball speed.

            I'm currently not clearing the context, so I would expect the existing balls to stay put. Instead they seem to slide smoothly along with the ball that's moving. I'd like to understand why this is the case.

            Here is an image of how the current code runs at 4 fps so that you can see how the shapes are being drawn and shift back and forth:

            Here is my code:

            ...

            ANSWER

            Answered 2021-Jul-01 at 21:38

            There are a lot of misunderstandings here, so I'll try to take them one by one:

            • CADisplayLink does not promise it will call your step method every 1/60 of a second. There's a reason the property is called preferred frames per second. It's just a hint to the system of what you'd like. It may call you less often, and in any case there will be some amount of error.

            • To perform your own animations by hand, you need to look at what time is actually attached to the given frame, and use that to determine where things are. The CADisplayLink includes a timestamp to let you know that. You can't just increment by speed. You need to multiply speed by actual time to determine distance.

            • "I'm currently not clearing the context, so I would expect the existing balls to stay put." Every time draw(rect:) is called, you receive a fresh context. It is your responsibility to draw everything for the current frame. There is no persistence between frames. (Core Animation generally provides those kinds of features by efficiently composing CALayers together; but you've chosen to use Core Graphics, and there you need to draw everything every time. We generally do not use Core Graphics this way.)

            • myView.setNeedsDisplay() does not mean "draw this frame right now." It means "the next time you're going to draw, this view needs to be redrawn." Depending on exactly when the CADisplayLink fires, you may drop a frame, or you might not. Using Core Graphics, you would need to update all the circle's locations before calling setNeedsDisplay(). Then draw(rect:) should just draw them, not compute what they are. (CADisplayLink is really designed to work with CALayers, though, and NSView drawing isn't designed to be updated so often, so this still may be a little tricky to keep smooth.)

            The more normal way to create this system would be to generate a CAShapeLayer for each ball and position them on the NSView's layer. Then in the CADisplayLink callback, you would adjust their positions based on the timestamp of the next frame. Alternately, you could just set up a repeating NSTimer or DispatchTimerSource (rather than a CADisplayLink) at something well below the screen refresh speed (like 1/20 s) and move the layer positions in that callback. This would be nice and simple and avoid the complexities of CADisplayLink (which is much more powerful, but expects you to use the timestamp and consider other soft real-time concerns).

            Source https://stackoverflow.com/questions/68215858

            QUESTION

            onClick of a btn i want to get it's sibling(input box) value with useRef and copyToClipboard, setState for that btn to Copied
            Asked 2021-May-29 at 05:49

            I'm using a shorten URL API when the user passes a valid link, i fetch API and render the shortened URL with "map medthod" to make them into a list. It has a btn next to each mapped "shortened URL" where onClick i try to copyToClipboard and change state of btn from Copy to Copied. The problem is currently it only works fine if i have 1 item(on click btn works fine with copyToClipboard) but if i have 2 buttons and i click the very 1st btn to copyToClipboard it's focusing the last item in mapped list and copying the value of (last item) 2nd btn and also setting state for all btns to copied. I also don't understand why i can't see li tags with keys in console when i pass them the keys. can someone help me out. I just want to copyToClipboard that input value of the btn i have clicked. here's what it looks like - image of onCLick of 1st btn 2nd btn gets focus & image of no keys in console & apparently they aren't in a list? Here is the code below

            ...

            ANSWER

            Answered 2021-May-29 at 05:49

            Its because you are using a single ref for all the links

            You are looping over all the links and giving their .So the ref will always be attached to the last link input

            Maybe don't use refs and use an alternative copyToClipboard function like this one

            Source https://stackoverflow.com/questions/67747035

            QUESTION

            Can't install new kernel, hangs on DKMS installing EVDI
            Asked 2021-Apr-24 at 03:01

            Whenever I see the update manager glowing that I have an update I get annoyed and click it, so I'm almost always updating something and usually this has gone fine without any problems...

            Recently it told me there was a new kernel update, so I clicked install like I usually do but it just got stuck, for hours. When I examined the terminal output it was hanging on a DKMS installation step, so I grabbed all the active DKMS processes and found that the specific thing it was hanging on was installing something called EVDI (which is related to the DisplayLink Ubuntu driver, I think). After letting it sit there doing nothing for more than a day I killed it and had to Timeshift back to before I had done the installation as it corrupted my kernel.

            I examined the log file in /var/lib/dkms/evdi/5.2.14/build/make.log and found that it has many errors reported, and the one that starts the chain is:

            ...

            ANSWER

            Answered 2021-Apr-24 at 03:01

            Ultimately fixed by booting into an old 5.4 kernel, purging DKMS + all of the 5.8 kernels and a troublesome 5.4 kernel (had to do some things by hand as apt would not remove some directories), then reinstalling everything and updating grub from the 5.4 kernel. Just tested an update via the update manager (now running on the latest 5.8 kernel) and it worked fine! Unclear what exactly was causing the problem but glad it's fixed and hope this helps others if they stumble into something like this.

            Source https://stackoverflow.com/questions/67219975

            QUESTION

            CADisplayLink Timer Not working proper | Swift
            Asked 2021-Apr-12 at 09:23

            I've been stuck with my timer, my goal is to know for how long the user sees the post to count it as impression. what I mean is if you watch an event for more than 3 seconds it will count as Impression.

            Now for some reason the timer works not as I expected and to be honest its close to work as I want to which freaks me out cause I'm close to the solution. My problem is that sometimes the func which takes care of StalkCells is also marking posts which are not displayed for long than 3 seconds as "Impression" or count.

            Here's my Code: first my VC:

            ...

            ANSWER

            Answered 2021-Jan-17 at 18:22

            If you want to create a display link, you would generally just call CADisplayLink(target:selector:). See CADisplayLink documentation suggests that it would be something like:

            Source https://stackoverflow.com/questions/65762687

            QUESTION

            Tox: per-platform configuration for tools like flake8 and pylint
            Asked 2021-Apr-02 at 09:21

            I've got tox.ini configuration for ci both in linux and windows environments, something like that:

            ...

            ANSWER

            Answered 2021-Apr-01 at 11:55

            Maybe I miss some parts of your requirement, but running flake8 platform specific seems pretty straightforward:

            Source https://stackoverflow.com/questions/66900752

            QUESTION

            Ryzen 7 4800, Ubuntu 20.04.02: Display and/or USB problems
            Asked 2021-Mar-17 at 08:34

            Installed Ubuntu Studio 20.04 on an ASUS PN50 mini-PC with Ryzen 7 4800. Upgraded to 20.04.2, kernel 5.8.0-44-lowlatency. Memory 32 GB 3200 MHz. Installation itself was smooth. The box only runs Radeon graphics. There is no NVIDIA. The desktop is Xfce 4.14.

            I may be mixing apples and oranges, but since I can't tell (I'm not a hw freak) I'll report more than one issue. They may or may not be related, please bear with me.

            Prelude: After installation the system didn't seem to boot. Stuck with Ubuntu splash screen.

            On closer look lightdm wouldn't start. This fact kept the system waiting indefinitely.

            I modified /etc/default/grub, deleted "quiet splash", added "nomodeset". The system now boots to text. After logging in I do a manual "startx" and the box generally seems to behave well. Graphics look good, snappy response. Later I added "amdgpu.exp_hw_support=1" to grub, but I haven't noticed any difference. The gpumanager log ends with "Nothing to do".

            I'm not sure what lightdm does, but it is the default display manager:
            /etc/X11/default-display-manager: /usr/sbin/lightdm

            Here is systemctl status lightdm.service output. I'm not sure what it's telling me.

            ...

            ANSWER

            Answered 2021-Mar-17 at 08:34

            After two days of lightdm crash course, here is the answer, and it has nothing to do with Ryzen.

            One file was missing from the lightdm configuration. This is an installation from scratch, so either it's missing from the Ubuntu Studio distribution, or maybe I unwittingly deleted it myself somehow.

            The file is: /usr/share/lightdm/lightdm.conf.d/60-lightdm-gtk-greeter.conf:

            Source https://stackoverflow.com/questions/66642491

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            You can download it from GitHub.

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