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Applicatie/AddPeoplePanel.java

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+package Applicatie;
+
+import java.awt.BorderLayout;
+import java.awt.Color;
+import java.awt.Dimension;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.awt.event.KeyEvent;
+import java.awt.event.KeyListener;
+
+import javax.swing.JButton;
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+import javax.swing.JOptionPane;
+import javax.swing.JPanel;
+import javax.swing.JTextField;
+
+public class AddPeoplePanel extends JFrame {
+
+	public AddPeoplePanel(Panel topPanel) {
+		super("Adding people");
+		setDefaultCloseOperation(HIDE_ON_CLOSE);
+		setResizable(false);
+		
+		JPanel mainPanel = new JPanel(new BorderLayout());
+		JLabel label;
+		JButton button;
+		
+		//Top:
+		JPanel panel = new JPanel();
+		label = new JLabel("Enter the amount of people you want to add: ");
+		panel.add(label);
+		mainPanel.add(panel,BorderLayout.NORTH);
+		//Center:
+		panel = new JPanel();
+		JTextField amountOfPeopleField = new JTextField("0");
+		amountOfPeopleField.setPreferredSize(new Dimension(100,20));
+		amountOfPeopleField.addKeyListener(new KeyListener() {
+			
+			@Override
+			public void keyTyped(KeyEvent e) {
+			}
+			
+			@Override
+			public void keyReleased(KeyEvent e) {
+				try {
+					amountOfPeopleField.setBackground(Color.WHITE);
+					int amountOfPeople = Integer.parseInt(amountOfPeopleField.getText());
+					amountOfPeopleField.setText(amountOfPeople + "");
+				}
+				catch(NumberFormatException nf) {
+					amountOfPeopleField.setBackground(Color.RED);
+				}
+			}
+			
+			@Override
+			public void keyPressed(KeyEvent e) {
+			}
+		});
+		
+		label = new JLabel("people ");
+		panel.add(amountOfPeopleField);
+		panel.add(label);
+		mainPanel.add(panel,BorderLayout.CENTER);
+		//Bottom:
+		panel = new JPanel();
+		button = new JButton("Cancel");
+		button.addActionListener(new ActionListener() {
+			
+			@Override
+			public void actionPerformed(ActionEvent e) {
+				AddPeoplePanel.this.dispose();
+			}
+		});
+		panel.add(button);
+		button = new JButton("Apply");
+		button.addActionListener(new ActionListener() {
+			
+			@Override
+			public void actionPerformed(ActionEvent e) {
+				if(amountOfPeopleField.getBackground() != Color.RED) {
+					topPanel.addVisitors(Integer.parseInt(amountOfPeopleField.getText()));
+					AddPeoplePanel.this.dispose();
+				}
+				else 
+					JOptionPane.showMessageDialog(topPanel, "Only numbers are accepted");
+			}
+		});
+		panel.add(button);
+		mainPanel.add(panel,BorderLayout.SOUTH);
+		
+		add(mainPanel);
+		
+		//Finishing off
+		pack();
+		setSize(290,150);
+		setLocationRelativeTo(null);
+		setVisible(true);
+	}
+}