JavaTutorial #11 : How to create Delegating SP aplication using ja...

JavaTutorial #11 : How to create Delegating SP aplication using ja... | Ecency

Repository

https://github.com/dmlloyd/openjdk

What Will I Learn?

You will learn about steemconnect link for delegating SP
You will learn how to create form for this aplication
You will learn how to combine data from the form in steemconnect link

Requirements

NetBeans IDE Software
Basic Knowledge about Java Programing and Netbeans

Difficulty

Basic

Tutorial Contents

Here, I will try to create an aplication for delegating SP to another user using java Netbeans IDE. This aplication contains a form to input the destination and number of SP to be delegated. When user press the delegate button, a new window will appear where the user is that required to login using steemconnect. For more details, you can see in the picture below.

Create a form

open Netbeans IDE software then create new project
Add new JFrame Form
Add JLabel, JTextField, JButton like following screenshot

Edit Source Code

Double click on button in form design
add some method, here I use delegate() method.
Left Click on hint simbol then double click on create method "delegate"
go to delegate() method

Adding code to `delegate()` method

Create 2 string variables to accomodate destination and amount delegation from user input.

String receiveUser=user.getText();
String sp=amount.getText();

getText() is a method to get text from user input. Data that taken using getText() mehtod are in String form

Add a code to open new JFrame Form for opening steemconnect login

        final JFrame frame=new JFrame();
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        frame.setSize(1280,720);

frame the variable name for new JFrame. setDefaultCloseOperation is method to set the the exit button on right-top corner. setSize() is method to set the width and height of the new frame

Note : before adding the code above, you need to import package javax.swing.JFrame;

Initialize new JFX panel to open the mini browser

        final JFXPanel fxpanel=new JFXPanel();
        frame.add(fxpanel);

Then add following code under it

        Platform.runLater(new Runnable(){
            @Override
            public void run() {
                WebEngine engine;
                WebView wv =new WebView();
                engine=wv.getEngine();
                fxpanel.setScene(new Scene(wv));
                engine.load("https://steemconnect.com/sign/delegateVestingShares?delegator=&delegatee="+receiveUser+"&vesting_shares="+sp+"%20SP");         
            }
        });
        frame.setVisible(true);

Platform.runLater is method to run some task on JFXpanel
@Override to implement all abstract method
public void run() is run method.
WebEngine engine; Inisialize web engine
WebView wv =new WebView(); inssialize web view
engine=wv.getEngine();get view from web engine
fxpanel.setScene(new Scene(wv));set scene on JFXpanel
engine.load("https://steemconnect.com/sign/delegateVestingShares?delegator=&delegatee="+receiveUser+"&vesting_shares="+sp+"%20SP"); load the url

Modify Steemconnect URL

Here we need steemconnect URL, and this url we need to modify. steemconnect URL for delegating steem power : https://steemconnect.com/sign/delegateVestingShares?delegator=&delegatee=[UserDestination]&vesting_shares=0%[amount]SP
We modify [UserDestination] and [amount] as variable that get data from user input. So the RL become like this : "https://steemconnect.com/sign/delegateVestingShares?delegator=&delegatee="+receiveUser+"&vesting_shares="+sp+"%20SP"