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Questions tagged [event-handling]

Event handling is a coding pattern related to acting on messages between a source and one or more subscribers. A point listener in the source provides a way in which subscribed code can consume messages raised from the source.

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Event emitter npm module

I was asked to complete the task described below: Event Emitters are objects that serve as the core building block in event-driven architectures. They simplify the process of handling asynchronous ...
Sᴀᴍ Onᴇᴌᴀ's user avatar
4 votes
1 answer
224 views

Improved Event System & InputManager Using C++

I am new to C++, so please take me easy. I want to make a low-level game engine only using C++, OpenGL and GLFW. This is a continuation of Event System using C++ ; I added the suggestions from there. ...
Andrei Rost's user avatar
3 votes
2 answers
2k views

Event System using C++

I am excited to share that I have developed an event system in C++. I have always been passionate about programming and have long aspired to create a low-level game engine solely using C++, OpenGL, ...
Andrei Rost's user avatar
3 votes
1 answer
60 views

A JavaFX program to find out the mouse refresh rate v2

(See the continuation of this post in A JavaFX program to find out the mouse refresh rate v3.) (This post is a continuation of A JavaFX program to find out the mouse refresh rate.) After adopting the ...
coderodde's user avatar
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19 votes
5 answers
7k views

Using sounds in Java

I'm trying to apply sound today, and the goal in mind was a simple violin tuner. The actionListener seems repetitive/ How might I optimize it (what I tried just ...
Legato's user avatar
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18 votes
2 answers
4k views

Using events together with interfaces in VBA

Introduction Because of the limitation of VBA in using events in interfaces I was searching for a kind of workaround. For sure I also read this which also provides an approach, but I was searching for ...
AHeyne's user avatar
  • 428
10 votes
1 answer
698 views

Finger painting code

I have a very simple view that handles touch events and draws accordingly. It's nothing significant, but it does use a bit more CPU than I would like (35%). Again, it is the bare minimum (<90 lines)...
Josue Espinosa's user avatar
10 votes
1 answer
442 views

Resizable containers with VueJS

A month ago I reviewed the code in Resizable split DIVs Vue.js, suggesting that the OP use computed properties and bound styles to simplify the code (at least reducing the need to use ...
Sᴀᴍ Onᴇᴌᴀ's user avatar
9 votes
2 answers
709 views

Animated Calendar using HTML + CSS + JS

I'm a beginner developer and I'm building a calendar for smartphones. I'm using HTML, CSS and JS. I'm not entirely done with the project yet, however, I have the feeling that I'm making a messy code. ...
LUCAS DE BIAZI FERREIRA's user avatar
9 votes
3 answers
791 views

Carousel in Vanilla JavaScript

I finally got my carousel to work in JavaScript, and I want to know what you guys think about it and what I can do better. ...
Jordan Baron's user avatar
8 votes
2 answers
3k views

Overriding all Access form control AfterUpdate methods

I have a set of custom event handlers for all my textboxes and combo boxes. The reason for this is my users want the bound form (to SQL Server) to immediately push changes to the recordset, rather ...
enderland's user avatar
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8 votes
1 answer
2k views

C++ Event System - Game Engine

Introduction I have just started learning templates and experimenting with function pointers. I wanted to create an event system that met a couple of goals: Event types are PODs, and do not inherit ...
kainev's user avatar
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8 votes
1 answer
2k views

How can I condense several IBAction methods in a class with a delegate?

I have the following class: MyProtocolClass.h ...
nhgrif's user avatar
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7 votes
2 answers
252 views

eCommerce Mockup App in JS

I have completed this mockup eCommerce app using Javascript. This version can add products into a shopping cart and automatically calculate the order summary in the shopping cart. It can also delete ...
Steve Ngai's user avatar
7 votes
1 answer
204 views

My EventBus system

I decided to roll out my own EventBus system which is intended to be thread-safe. Hence a review should focus extra on thread safety apart from all regular concerns. The ...
skiwi's user avatar
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7 votes
1 answer
427 views

Threadsafe oneshot-event which fires on subscription if the event was fired in the past

Assumptions Basically, a Connection class has a "Disconnect" event. Subscribing to this event isn't thread-safe, because the disconnection may fire from another thread right before I subscribe. So ...
Oachkatzl's user avatar
  • 173
6 votes
1 answer
558 views

Resizable split DIVs Vue.js

I just started Developing Web App (Vue.js) for my company for around 1-2 months. Therefore, my knowledge and experience in HTML, CSS and Javascript is kinda shallow. I've created a custom resizable ...
Muhammad Azizi Abdul Aziz's user avatar
6 votes
1 answer
3k views

Navigation bar built from fetched JSON data

I have finally been able to create my little navigation plugin in an object-oriented way that reads the li from a JSON file. Now, is my code efficient? Especially, ...
angular_learner's user avatar
5 votes
1 answer
2k views

Copy Cell on Worksheet_Change event if some criteria is met

This code is working fine, but it looks awful (yes, I am a rookie on this thing). How can I improve it to look better? ...
user avatar
5 votes
3 answers
2k views

Subscribing an Object to its own Events

Is it appropriate for the class to subscribe to its own events like this? Should the class not subscribe, and instead move that code to before the ...
Der Kommissar's user avatar
5 votes
1 answer
355 views

Two keyboard handlers for a video game character

The code below is equivalent. I can see pros and cons for both versions. Which is better: the short, clever way, or the long, ctrl+c way? Short version: ...
MaiaVictor's user avatar
  • 1,101
4 votes
2 answers
275 views

A C WinAPI program for showing the color of the screen pixel pointed to by mouse cursor with clipboard support

(See the follow-up question.) I have this program that shows a small window and that window shows a rectangle whose color is the same as the color of the pixel under the mouse cursor. Note that it ...
coderodde's user avatar
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4 votes
0 answers
171 views

"Lock-free" one-shot event manager

Giving a review to Oachkatzl and recently about some other synchronization problems (Lazy with invalidate and some node-locking list), I wanted to test my skills and redesign it in most light-weight ...
user avatar
4 votes
1 answer
69 views

Style-changing handler for an HTML drop-down box

How can I maybe do some loop that will compress the amount of JavaScript/jQuery I need to use. I have a function s3episodesChange() linked to a ...
John123's user avatar
  • 205
4 votes
0 answers
478 views

Media player subtitles in WPF - Part 2 Handlers and notifications

This is a continuation of Part 1. In this question I will present you with a single class which is the most crucial component of the whole system, it's responsible for firing notifications whenever a ...
Denis's user avatar
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4 votes
2 answers
1k views

Get array of pressed buttons using extension method

In my game, I need to detect whether any buttons/keys are pressed at all before I try to process any input. This is easy enough for keys since the XNA library provides a ...
Big McLargeHuge's user avatar
4 votes
2 answers
91 views

Initializing events on class

I wrote a simple class that substitutes all file inputs in an HTML for a more complex template and set some actions on it. The code is rather small, but I'm not used to write JavaScript. I wonder if ...
fotanus's user avatar
  • 227
3 votes
2 answers
86 views

Limit second <select> options based on the first <select>

I want to see if there's a better way to write this code, solely in Javascript. There are two kinds of sets, the first set (C7, T7, C11, T11) have four options in the first select, and then up to two ...
Liv Strawbridge's user avatar
3 votes
2 answers
932 views

jQuery dynamic toggle class function

I wrote this function that will toggle a class of a targeted element. Applying the class js_class_toggle to any element will trigger the function when clicking on ...
K.D's user avatar
  • 133
3 votes
1 answer
2k views

Unit-testing event aggregator

I have written event aggregator with the following API (just for the fun of it, I am aware that nuget has like 100 similar implementations): ...
Nikita B's user avatar
  • 13k
2 votes
1 answer
319 views

To-do app front-end in Vue 3

I have put together a To-do Application with the Slim framework on the back-end (API) and a Vue 3 front-end. I added a demo on my YouTube channel. In the main App.vue file I have: ...
Razvan Zamfir's user avatar
2 votes
1 answer
1k views

MVVM implementation using C# and XAML

I have used INotifyPropertyChanged for both Model and ViewModel. Is it correct? First of all I was trying to use ...
Pranit Kothari's user avatar
2 votes
1 answer
80 views

A JavaFX program to find out the mouse refresh rate

(See the next version here.) Intro I have this tiny JavaFX program that shows a 800x600 pixel canvas. You are supposed to drag the mouse within the canvas. When you are done dragging, the program will ...
coderodde's user avatar
  • 28.4k
2 votes
1 answer
396 views

Truncate text to some number of words when clicked

I am currently using the code below to truncate text: ...
Vaishal Patel's user avatar
1 vote
1 answer
187 views

A C WinAPI program for showing the color of the screen pixel pointed to by mouse cursor with clipboard support - follow up

(See the previous question.) Now I have incorporated some suggestions by Barmak Shemirani. See what I have: ...
coderodde's user avatar
  • 28.4k
1 vote
0 answers
963 views

Simple Pub-Sub Event Emitter

I have written a basic event emitter in JavaScript and I'd like some feedback on my design. I tried to make it as simple and minimalist as possible, as I'd like it to be understandable by anyone. I ...
Jack Wilsdon's user avatar
  • 1,651
1 vote
0 answers
43 views

A JavaFX program to find out the mouse refresh rate v3

(This post is the continuation of A JavaFX program to find out the mouse refresh rate v2.) After taking @J_H's suggestions into account, I ended up here: ...
coderodde's user avatar
  • 28.4k
1 vote
1 answer
668 views

C# Events in a Tic Tac Toe game

I am new to coding and am trying to understand events what is an annoying stage but super important I guess. I just made a Tic Tac Toe game and it is working but not really "beautiful" coded. I really ...
Pr0gr4mm3r's user avatar
1 vote
1 answer
160 views

Showing form on btn click - preventDefault of submit btn, then remove listener

I've built out a section on a page that contains multiple instances (why I'm using querySelectorAll()) of this Request Brochure form. They are using Campaign ...
Bagseye's user avatar
  • 401
1 vote
2 answers
100 views

Javascript to-do application for native Javascript

I did a simple to-do application for native Javascript. This is my first time, previously I used only jQuery. What recommendations would be useful? https://codepen.io/denibudeyko/pen/MWyEmox ...
Dan's user avatar
  • 121
0 votes
3 answers
199 views

Delayed, concurrent event stack in Java

(See the next iteration: Delayed, concurrent event stack in Java - follow-up ) Motivation I was confronted with a task of having "message events" for a GUI program. The use case is as ...
coderodde's user avatar
  • 28.4k