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Explore all Cryptocurrency open source software, libraries, packages, source code, cloud functions and APIs.

Popular New Releases in Cryptocurrency

2.9.0

2022.3

Release 1.4.1

v0.8.4 🌈

5.7.2

vnpy

2.9.0

freqtrade

2022.3

zipline

Release 1.4.1

qlib

v0.8.4 🌈

firefly-iii

5.7.2

Popular Libraries in Cryptocurrency

Trending New libraries in Cryptocurrency

Top Authors in Cryptocurrency

1

41 Libraries

22859

2

31 Libraries

2461

3

29 Libraries

11012

4

23 Libraries

2151

5

23 Libraries

985

6

20 Libraries

2282

7

18 Libraries

317

8

16 Libraries

704

9

15 Libraries

515

10

15 Libraries

1328

1

41 Libraries

22859

2

31 Libraries

2461

3

29 Libraries

11012

4

23 Libraries

2151

5

23 Libraries

985

6

20 Libraries

2282

7

18 Libraries

317

8

16 Libraries

704

9

15 Libraries

515

10

15 Libraries

1328

Trending Kits in Cryptocurrency

build-cryptocurrency-applications

Build Cryptocurrency Applications

Understanding opensource is important for anyone getting into cryptocurrency - whether it's developers mining crypto, policymakers regulating laws around crypto, or the public transacting with crypto. The backbone of many major Cryptocurrencies (like Bitcoin) and Blockchain is open-source software. While this is a concept anyone in the tech industry will already understand, the rest of the audience may not fully grasp its relevance. Bitcoin, a peer-to-peer decentralized digital currency and probably the most popular cryptocurrency today, is open source. The design is open to the community and anyone can contribute towards making the platform better. Developers can also use Bitcoin's source code to build their own services or software. How would this differ from a privately owned cryptocurrency? Firstly, as long as crypto transactions are happening over a blockchain network the transactions are decentralized. This means there is no need for a central clearing authority and transactions happen peer-to-peer. Even with this setup, however, the body owning the cryptocurrency can apply policies and regulations to the platform. They can control the value of the currency, they can restrict its daily usage, they can limit its use to selective products/services, they can control the supply, etc. This setup can quickly become tantamount to a regulatory body like the government that maintains authority over currency and transactions, and in a sense becomes a centralized (controlled) form of currency. Open source prevents this from happening. The cryptocurrency delivers all required functionality - users can perform transactions using crypto, and no element in the network, neither the platform nor the transactions, is controlled by a central body. When you use open source crypto for applications, you own the underlying software and no entity can claim stake or influence its functionality.

popular-libraries-for-dapps

Popular Libraries for dApps

Cryptocurrency is one of the most exciting new technologies out there. It's changing the way we think about money, transactions, security, and more. dApps are the new way to get involved in cryptocurrency and share your own dApp with other users. dApps can operate autonomously using smart contracts on a peer-to-peer network of computers or a decentralized computing, blockchain system. dApps, or decentralized applications, are software that users can access via a browser or mobile phone. This is what gives them their name—they're "decentralized," meaning they don't rely on a single server. Instead, they operate autonomously using smart contracts on a peer-to-peer network of computers or a decentralized computing, blockchain system. They operate autonomously and can't be shut down or hacked into by anyone—even the creator! dApps are popular in Cryptocurrency. What kind of dApps are there? Well, you can build games like Splinterlands, trading cards like AtomicAssets, marketplaces for NFTs like OpenSea and Katana, or an exchange for cryptocurrencies like PancakeSwap. No matter what type of app you want to build, there's an open source library for it! Here's some of the most popular libraries for creating dApps:

top-12-altcoin-libraries

Top 12 Altcoin Libraries

If you've been looking for open source libraries to help you build Altcoin applications, this is the post for you. When Bitcoin was released in 2008, it blew everyone's minds. It was the first peer-to-peer currency transfer system that didn't require any intermediary—no banks, no credit card companies. It was also open source and decentralized, so everyone could use it equally. But there are lots of issues with Bitcoin as well, including scalability and security. So people started to create their own cryptocurrencies, called Altcoins. Altcoins are alternatives to bitcoins. They're often used to solve problems that have come up with bitcoin and other cryptocurrency users. What's interesting about Altcoin is that they're built on top of bitcoin's open source code, then modified to fit the needs of their developers and users. Now there are hundreds of these Altcoins out there, each doing something a little different than others. They're mostly open source and decentralized as well, but some help to solve the problems Bitcoin has with security or scalability better than others. In the past few years, the number of Altcoins has increased exponentially—just like the number of Bitcoin applications. We love seeing people use these open source libraries in their own development projects, so we're highlighting some of the popular open source libraries across Ethereum, Aave, Lucky Block, Cardano, Decentraland, Algorand and others.

top-chainlink-libraries

Top ChainLink Libraries

It's an exciting time to be a developer on the ChainLink network! ChainLink is a cryptocurrency with a goal of incentivizing a global network of computers to provide reliable, real-world data to smart contracts running on top of blockchains. The ChainLink network is a decentralized oracle network that provides reliable, tamper-proof inputs and outputs for complex smart contracts on any blockchain. It's not only about the data itself; it's also about the ability for disparate blockchains and systems to talk to each other. A blockchain can't function without data from sources outside its own ecosystem. So Chainlink allows you to use external APIs and information sources (like sports scores, weather forecasts, flight schedules, and more) in your smart contract. Here are open source libraries that are popular for ChainLink use cases across Chainlink Nodes, Services for using the Chainlink API, Connecting Chainlink to other services and Community resources Note: These are not the only tools that can be used for ChainLink projects, but they are popular and well-loved by developers. We encourage you to explore some of these resources to figure out what works best for your project.

build-cryptocurrency-applications

Build Cryptocurrency Applications

Understanding opensource is important for anyone getting into cryptocurrency - whether it's developers mining crypto, policymakers regulating laws around crypto, or the public transacting with crypto. The backbone of many major Cryptocurrencies (like Bitcoin) and Blockchain is open-source software. While this is a concept anyone in the tech industry will already understand, the rest of the audience may not fully grasp its relevance. Bitcoin, a peer-to-peer decentralized digital currency and probably the most popular cryptocurrency today, is open source. The design is open to the community and anyone can contribute towards making the platform better. Developers can also use Bitcoin's source code to build their own services or software. How would this differ from a privately owned cryptocurrency? Firstly, as long as crypto transactions are happening over a blockchain network the transactions are decentralized. This means there is no need for a central clearing authority and transactions happen peer-to-peer. Even with this setup, however, the body owning the cryptocurrency can apply policies and regulations to the platform. They can control the value of the currency, they can restrict its daily usage, they can limit its use to selective products/services, they can control the supply, etc. This setup can quickly become tantamount to a regulatory body like the government that maintains authority over currency and transactions, and in a sense becomes a centralized (controlled) form of currency. Open source prevents this from happening. The cryptocurrency delivers all required functionality - users can perform transactions using crypto, and no element in the network, neither the platform nor the transactions, is controlled by a central body. When you use open source crypto for applications, you own the underlying software and no entity can claim stake or influence its functionality.

top-12-altcoin-libraries

Top 12 Altcoin Libraries

If you've been looking for open source libraries to help you build Altcoin applications, this is the post for you. When Bitcoin was released in 2008, it blew everyone's minds. It was the first peer-to-peer currency transfer system that didn't require any intermediary—no banks, no credit card companies. It was also open source and decentralized, so everyone could use it equally. But there are lots of issues with Bitcoin as well, including scalability and security. So people started to create their own cryptocurrencies, called Altcoins. Altcoins are alternatives to bitcoins. They're often used to solve problems that have come up with bitcoin and other cryptocurrency users. What's interesting about Altcoin is that they're built on top of bitcoin's open source code, then modified to fit the needs of their developers and users. Now there are hundreds of these Altcoins out there, each doing something a little different than others. They're mostly open source and decentralized as well, but some help to solve the problems Bitcoin has with security or scalability better than others. In the past few years, the number of Altcoins has increased exponentially—just like the number of Bitcoin applications. We love seeing people use these open source libraries in their own development projects, so we're highlighting some of the popular open source libraries across Ethereum, Aave, Lucky Block, Cardano, Decentraland, Algorand and others.

Trending Discussions on Cryptocurrency

    Flutter - How to refresh a Widget on button Click?
    Find element by Xpath. How to split the element I don't want inside the Xpath
    Can't use Selenium to find elements. Try to avoid deprecated commands warning, got result only one element. (on Colab)
    How to programmatically validate Tether (TRC20) Wallet Addresses in PHP?
    Custom Loss Function - Keras
    Running python file on windows CMD vs VScode
    How to turn HTML widget code into NEXTjs code to use in an app (CoinMarketCap Price Marquee Ticker)
    How can I properly graph these two datasets using Pandas in Matplotlib?
    For each item update database
    Why are certain time values not plotting on this graph?

QUESTION

Flutter - How to refresh a Widget on button Click?

Asked 2022-Mar-01 at 10:15

I'm making an app where I plot charts of cryptocurrency. I have a file like this, that renders a chart of btc/24h in it. I'm using chart_sparkline package to plot the chart.

I have the following code, and it is not working on a button click, how do I fix this?

1import 'package:flutter/material.dart';
2import 'package:tracker/renderchart.dart';
3
4class Portfolio extends StatefulWidget {
5    @override
6    _PortfolioState createState() => _PortfolioState();
7}
8
9class _PortfolioState extends State<Portfolio> {
10    Widget portfolioChart = RenderPortfolioChart(coin: "bitcoin", days: 1);
11
12    @override
13    Widget build(BuildContext context) {
14        return Container(
15            child: Column(
16                children: [
17                    portfolioChart,
18
19                    const Padding(padding: EdgeInsets.only(top: 10.0)),
20
21                    const Text("Hello, there!", style: TextStyle(color: Colors.white)),
22
23                    const Padding(padding: EdgeInsets.only(top: 10.0)),
24
25                    ElevatedButton(
26                        onPressed: (){
27                            print("updating chart");
28                            setState(() {
29                              portfolioChart = RenderPortfolioChart(coin: "ethereum", days: 1);
30                            });
31                        },
32
33                        child: Text("ETH"),
34                    )
35                ]
36            ),
37        );
38    }
39}
40

Basically, the elevatedButton should update the chart, but it is not working in my case, how to fix this?

ANSWER

Answered 2022-Mar-01 at 10:15

I fixed this, I was passing constructor parameters of Portfolio to _PortfolioState, this won't update the values the next time. Instead of passing these values to _PortfolioState, I used widget.coin and widget.days to extract the data from the Portfolio class.

Thanks to this StackOverflow link: Passing Data to a Stateful Widget in Flutter

Source https://stackoverflow.com/questions/71293849

Community Discussions contain sources that include Stack Exchange Network

    Flutter - How to refresh a Widget on button Click?
    Find element by Xpath. How to split the element I don't want inside the Xpath
    Can't use Selenium to find elements. Try to avoid deprecated commands warning, got result only one element. (on Colab)
    How to programmatically validate Tether (TRC20) Wallet Addresses in PHP?
    Custom Loss Function - Keras
    Running python file on windows CMD vs VScode
    How to turn HTML widget code into NEXTjs code to use in an app (CoinMarketCap Price Marquee Ticker)
    How can I properly graph these two datasets using Pandas in Matplotlib?
    For each item update database
    Why are certain time values not plotting on this graph?

QUESTION

Flutter - How to refresh a Widget on button Click?

Asked 2022-Mar-01 at 10:15

I'm making an app where I plot charts of cryptocurrency. I have a file like this, that renders a chart of btc/24h in it. I'm using chart_sparkline package to plot the chart.

I have the following code, and it is not working on a button click, how do I fix this?

1import 'package:flutter/material.dart';
2import 'package:tracker/renderchart.dart';
3
4class Portfolio extends StatefulWidget {
5    @override
6    _PortfolioState createState() => _PortfolioState();
7}
8
9class _PortfolioState extends State<Portfolio> {
10    Widget portfolioChart = RenderPortfolioChart(coin: "bitcoin", days: 1);
11
12    @override
13    Widget build(BuildContext context) {
14        return Container(
15            child: Column(
16                children: [
17                    portfolioChart,
18
19                    const Padding(padding: EdgeInsets.only(top: 10.0)),
20
21                    const Text("Hello, there!", style: TextStyle(color: Colors.white)),
22
23                    const Padding(padding: EdgeInsets.only(top: 10.0)),
24
25                    ElevatedButton(
26                        onPressed: (){
27                            print("updating chart");
28                            setState(() {
29                              portfolioChart = RenderPortfolioChart(coin: "ethereum", days: 1);
30                            });
31                        },
32
33                        child: Text("ETH"),
34                    )
35                ]
36            ),
37        );
38    }
39}
40

Basically, the elevatedButton should update the chart, but it is not working in my case, how to fix this?

ANSWER

Answered 2022-Mar-01 at 10:15

I fixed this, I was passing constructor parameters of Portfolio to _PortfolioState, this won't update the values the next time. Instead of passing these values to _PortfolioState, I used widget.coin and widget.days to extract the data from the Portfolio class.

Thanks to this StackOverflow link: Passing Data to a Stateful Widget in Flutter

Source https://stackoverflow.com/questions/71293849