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GUI component interaction: Difference between revisions
+Java
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<lang j>interact_run''</lang>
=={{header|Java}}==
{{works with|Swing}}
{{works with|AWT}}
There are nice GUI editors in some IDEs (Netbeans has a notoriously good one), but this GUI was not built automatically, so it's a little easier to understand.
<lang java>import java.awt.GridLayout;
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.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class Interact extends JFrame{
final JTextField numberField;
final JButton incButton, randButton;
public Interact(){
//stop the GUI threads when the user hits the X button
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
numberField = new JTextField();
incButton = new JButton("Increment");
randButton = new JButton("Random");
numberField.setText("0");//start at 0
//listen for button presses in the text field
numberField.addKeyListener(new KeyListener(){
@Override
public void keyTyped(KeyEvent e) {
//if the entered character is not a digit
if(!Character.isDigit(e.getKeyChar())){
//eat the event (i.e. stop it from being processed)
e.consume();
}
}
@Override
public void keyReleased(KeyEvent e){}
@Override
public void keyPressed(KeyEvent e){}
});
//listen for button clicks on the increment button
incButton.addActionListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent e) {
String text = numberField.getText();
if(text.isEmpty()){
numberField.setText("1");
}else{
numberField.setText((Long.valueOf(text) + 1) + "");
}
}
});
//listen for button clicks on the random button
randButton.addActionListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent e) {
//show a dialog and if they answer "Yes"
if(JOptionPane.showConfirmDialog(null, "Are you sure?") ==
JOptionPane.YES_OPTION){
//set the text field text to a random positive long
numberField.setText(Long.toString((long)(Math.random()
* Long.MAX_VALUE)));
}
}
});
//arrange the components in a grid with 2 rows and 1 column
setLayout(new GridLayout(2, 1));
//a secondary panel for arranging both buttons in one grid space in the window
JPanel buttonPanel = new JPanel();
//the buttons are in a grid with 1 row and 2 columns
buttonPanel.setLayout(new GridLayout(1, 2));
//add the buttons
buttonPanel.add(incButton);
buttonPanel.add(randButton);
//put the number field on top of the buttons
add(numberField);
add(buttonPanel);
//size the window appropriately
pack();
}
public static void main(String[] args){
new Interact().setVisible(true);
}
}</lang>
=={{header|Liberty BASIC}}==
===Input Verification===
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