DisplayLink | Per-frame actions for SwiftUI | Frontend Framework library
kandi X-RAY | DisplayLink Summary
kandi X-RAY | DisplayLink Summary
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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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of DisplayLink
DisplayLink Key Features
DisplayLink Examples and Code Snippets
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
Trending Discussions on DisplayLink
QUESTION
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 04:08Inside 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:
QUESTION
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 05:25change in JS
QUESTION
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 17:54I 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)
QUESTION
Suppose I have the following content in my file under "%userprofile%\~.txt":
...ANSWER
Answered 2021-Sep-10 at 20:00An alternative is to make use of powershell regex to do this:
QUESTION
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:
- Check for collisions.
- If there is a collision with the wall, multiply speed by -1.
- 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 21:38There 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 callingsetNeedsDisplay()
. Thendraw(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).
QUESTION
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 05:49Its 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
QUESTION
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 03:01Ultimately 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.
QUESTION
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 18:22If 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:
QUESTION
I've got tox.ini configuration for ci both in linux and windows environments, something like that:
...ANSWER
Answered 2021-Apr-01 at 11:55Maybe I miss some parts of your requirement, but running flake8
platform specific seems pretty straightforward:
QUESTION
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 08:34After 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
:
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