panelResources.java

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.border.*;
import java.lang.*;

public class panelResources extends JPanel{
  JLabel lblWelcome ;
  JLabel lblSelectMsg ;
  JLabel lblResource ;
  JComboBox cbCollection ;
  JButton btnConfirm ;
  private int downloadPercentage = 0;

  public panelResources () {
    if (vkClient.fromServer.equalsIgnoreCase(vkClient.errorMessage[0]) || vkClient.fromServer.equalsIgnoreCase(vkClient.errorMessage[1]) || vkClient.fromServer.equalsIgnoreCase(vkClient.errorMessage[2])){
      JOptionPane.showMessageDialog(null, vkClient.getUserInput() + " " + vkClient.fromServer + " " + vkClient.serverState, "Server message", JOptionPane.INFORMATION_MESSAGE);
      //System.exit(1);
    }

    lblWelcome = new JLabel();
    lblWelcome.setText("Welcome !");
    lblWelcome.setFont(new Font("Avenir Next", 0, 50));


    lblSelectMsg = new JLabel();
    lblSelectMsg.setText("Select a resource you desired for downloading.");
    lblSelectMsg.setFont(new Font("Avenir Next", 1, 14));

    lblResource = new JLabel();
    lblResource.setText("Resources: ");
    lblResource.setFont(new Font("Avenir Next", 1, 14));

    cbCollection = new JComboBox(vkClient.resourceList);
    cbCollection.setSelectedIndex(0);
  //  cbCollection.addActionListener(this);

    btnConfirm = new JButton();
    btnConfirm.setText("CONFIRM");
    btnConfirm.setFont(new Font("Avenir Next", 1, 14));
    btnConfirm.setCursor(new Cursor(Cursor.HAND_CURSOR));
    btnConfirm.addActionListener(
      new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent eventBtnConfirm) {
            btnConfirmActionPerformed(eventBtnConfirm);
        }
      }
    );

    add(lblWelcome);
    add(lblSelectMsg);
    add(lblResource);
    add(btnConfirm);
    add(cbCollection);

//To make layout in mainPage Panel using GroupLayout.
    GroupLayout glResources = new GroupLayout(this);
    glResources.setAutoCreateContainerGaps(true);

/* --- All grouping in this section is based on Horizontal view. --- */
    glResources.setHorizontalGroup(
      glResources.createSequentialGroup()
      .addGap(206, 206, 206)
          /* --- Group up to all component to become column 1 --- */
      .addGroup(
        glResources.createParallelGroup()
          /* --- Group up lblHostName,lblPortNumber with txtPortNumber,txtHostName (ROW 1). --- */
        .addGroup(
          glResources.createParallelGroup(GroupLayout.Alignment.LEADING)
          .addGroup(
            glResources.createSequentialGroup()
            .addGap(50,50,50)
            .addComponent(lblWelcome))
            .addGroup(
              glResources.createSequentialGroup()
              .addGap(25,25,25)
              .addComponent(lblSelectMsg))
          .addGroup(
            glResources.createSequentialGroup()
            .addGap(80,80,80)
            .addComponent(lblResource)
            .addComponent(cbCollection, GroupLayout.PREFERRED_SIZE, 120,GroupLayout.PREFERRED_SIZE))
          .addComponent(btnConfirm, GroupLayout.PREFERRED_SIZE, 387,GroupLayout.PREFERRED_SIZE))
      ));

    /* --- All grouping in this section is based on Horizontal view. --- */
    glResources.setVerticalGroup(
      glResources.createSequentialGroup()
      .addGap(80, 80, 80)
      .addComponent(lblWelcome)
      .addGap(40, 40, 40)
      .addComponent(lblSelectMsg)
      .addGap(40, 40, 40)
      .addGroup(
        glResources.createParallelGroup(GroupLayout.Alignment.BASELINE)
        .addComponent(lblResource)
        .addComponent(cbCollection))
      .addGap(93, 93, 93)
      .addComponent(btnConfirm, GroupLayout.PREFERRED_SIZE, 40,GroupLayout.PREFERRED_SIZE));
      setBackground(Color.decode("#FFFFFF"));

      setLayout(glResources);
      setVisible(true);
    } /* end of panelMainPage constructor */


      private void btnConfirmActionPerformed(java.awt.event.ActionEvent eventBtnConfirm){
        vkClient.sendUserInput(cbCollection.getSelectedIndex() + 1,2); // To notify server that the user is downloading.
        JOptionPane.showMessageDialog(null, vkClient.fromServer, "Server message", JOptionPane.INFORMATION_MESSAGE);
        ImageIcon icon = new ImageIcon(panelResources.class.getResource("/loading.gif"));

        JDialog dialog = new JDialog();

        Dimension dSize = new Dimension(600, 500);
        dialog.setSize(dSize);
        dialog.setMinimumSize(dSize);
        dialog.setMaximumSize(dSize);
        dialog.setResizable(false);
        Dimension wndScreen = Toolkit.getDefaultToolkit().getScreenSize();
        dialog.setLocation(wndScreen.width/2-this.getSize().width/2, wndScreen.height/2-this.getSize().height/2);
        dialog.setBackground(Color.decode("#FFFFFF"));
        dialog.setUndecorated(true);

        JPanel panelTest = new JPanel ();

        JLabel lblImgLoading = new JLabel(icon);

        JLabel lblPercentage = new JLabel();
        lblPercentage.setFont(new Font("Avenir Next",1, 30));
        lblPercentage.setForeground(Color.decode("#708090"));

        GroupLayout glWait = new GroupLayout(panelTest);
        glWait.setAutoCreateContainerGaps(true);
        glWait.setHorizontalGroup(
          glWait.createSequentialGroup()
          .addGroup(
            glWait.createParallelGroup()
            .addComponent(lblImgLoading)
            .addGroup(
              glWait.createSequentialGroup()
              .addGap(250,250,250)
              .addComponent(lblPercentage))));
        glWait.setVerticalGroup(
        glWait.createSequentialGroup()
          .addComponent(lblImgLoading)
        //  .addGap(20,20,20)
          .addComponent(lblPercentage));

        panelTest.setLayout(glWait);
        panelTest.add(lblImgLoading);
        dialog.add(panelTest);
        dialog.pack();
        dialog.setVisible(true);
        Timer percentageTimer = new Timer (200, null);;
        //For updating download percentage
        ActionListener updatePercentage = new ActionListener(){
          public void actionPerformed(ActionEvent e) {
                int incrementValue = (int)(Math.ceil((Math.random() * 5)));
                if ((downloadPercentage += incrementValue) >= 100){
                  dialog.dispose();
                  vkClient.sendUserInput(0,3);
                  percentageTimer.stop();
                }
                lblPercentage.setText(Integer.toString(downloadPercentage) + "%");
                panelTest.repaint();
                //JOptionPane.showMessageDialog(null, Integer.toString(lblPercentage.getValue()), "Success", JOptionPane.INFORMATION_MESSAGE);
            }
          };
          //Time for updating percentage
        percentageTimer.addActionListener(updatePercentage);
        percentageTimer.start();
      }
    }