How to Disable GUI Button in Java

Question

so I have this small piece of code for my GUI   import java awt BorderLayout  import java awt Component  import java awt Dimension   import javax swing JButton  import javax swing JFrame  import javax swing JPanel  import javax swing border EmptyBorder  import javax swing BoxLayout  import javax swing JSeparator  import java awt event ActionListener  import java awt event ActionEvent    public class IPGUI extends JFrame implements ActionListener        private static JPanel contentPane      private static boolean btn1Clicked   false      private static boolean btn2Clicked   false      private static boolean btn3Clicked   false      private static boolean btn4Clicked   false         Create the frame     public IPGUI                    Sets frame properties         setTitle  IP Extractor            setDefaultCloseOperation JFrame EXIT ON CLOSE           setBounds 100  100  250  300           contentPane   new JPanel            contentPane setBorder new EmptyBorder 5  5  5  5            contentPane setLayout new BorderLayout 0  0            setContentPane contentPane              Creates new JPanel with boxlayout         JPanel panel   new JPanel            contentPane add panel  BorderLayout CENTER           panel setLayout new BoxLayout panel  BoxLayout Y AXIS                               New Button                            JButton btnConvertDocuments   new JButton  1  Convert Documents            btnConvertDocuments setAlignmentX Component CENTER ALIGNMENT           btnConvertDocuments setMaximumSize new Dimension 160  0            btnConvertDocuments setPreferredSize new Dimension 0  50             panel add btnConvertDocuments            btnConvertDocuments setActionCommand  w            btnConvertDocuments addActionListener  ActionListener  this            if  btn1Clicked    true                        btnConvertDocuments setEnabled false                      JSeparator separator 3   new JSeparator            panel add separator 3                              New Button                            JButton btnExtractImages   new JButton  2  Extract Images            btnExtractImages setAlignmentX Component CENTER ALIGNMENT           btnExtractImages setMaximumSize new Dimension 160  0            btnExtractImages setPreferredSize new Dimension 0  50             panel add btnExtractImages            btnExtractImages setActionCommand  x            btnExtractImages addActionListener  ActionListener  this             if  btn2Clicked    true                          btnExtractImages setEnabled false                       JSeparator separator 2   new JSeparator            panel add separator 2                              New Button                            JButton btnParseRIDValues   new JButton  3  Parse rId Values            btnParseRIDValues setAlignmentX Component CENTER ALIGNMENT           btnParseRIDValues setMaximumSize new Dimension 160  0            btnParseRIDValues setPreferredSize new Dimension 0  50             panel add btnParseRIDValues            btnParseRIDValues setActionCommand  y            btnParseRIDValues addActionListener  ActionListener  this            if  btn3Clicked    true                        btnParseRIDValues setEnabled false                      JSeparator separator 1   new JSeparator            panel add separator 1                              New Button                            JButton btnParseImageInfo   new JButton  4  Parse Image Info             btnParseImageInfo setAlignmentX Component CENTER ALIGNMENT           btnParseImageInfo setMaximumSize new Dimension 160  0            btnParseImageInfo setPreferredSize new Dimension 0  50             panel add btnParseImageInfo            btnParseImageInfo setActionCommand  z            btnParseImageInfo addActionListener  ActionListener  this            if  btn4Clicked    true                        btnParseImageInfo setEnabled false                        public void actionPerformed ActionEvent event                 String command   event getActionCommand             if  command equals  w                          FileConverter fc   new FileConverter                btn1Clicked   true                    else if  command equals  x                          ImageExtractor ie   new ImageExtractor                btn2Clicked   true                    else if  command equals  y                           XMLIDParser xip   new XMLIDParser                btn3Clicked   true                    else if  command equals  z                           XMLTagParser xtp   new XMLTagParser                btn4Clicked   true                          The part I want to focus specifically  is this conditional    if  btn1Clicked    true                        btnConvertDocuments setEnabled false               So my belief is that what that command should do is this  once the button is clicked and the action performed method is called  btnClicked should be set to true  thus that button should then become disabled   Can someone explain where am I going wrong here  or if I have the right idea here  Thank you in advance for any input

User · Answer

Once you ve created the frame the part of the code with your conditional isn t going to get entered  To put it another way  at the time you execute the test if  btn1Clicked    true    the button has not only not been clicked yet  it hasn t even been displayed to the user    Lose the booleans and move the line with the btnConvertDocuments setEnabled false  into your actionListener  Make the buttons instance variables  do not make them static variables   Alternatively you could keep the buttons as local variables and assign each of them their own anonymous inner class listener

User · Answer

Is there a reason you are not doing something like   public class IPGUI extends JFrame implements ActionListener        private static JPanel contentPane       private JButton btnConvertDocuments      private JButton btnExtractImages      private JButton btnParseRIDValues      private JButton btnParseImageInfo       public IPGUI                               btnConvertDocuments   new JButton  1  Convert Documents                          btnExtractImages   new JButton  2  Extract Images                            etc             public void actionPerformed ActionEvent event                 String command   event getActionCommand             if  command equals  w                          FileConverter fc   new FileConverter                btnConvertDocuments setEnabled  false                      else if  command equals  x                          ImageExtractor ie   new ImageExtractor                btnExtractImages setEnabled  false                          etc                The if statement with your disabling code won t get called unless you keep calling the IPGUI constructor

User · Answer

really that not possible to disable JComponent s  if output to the GUI is invoked from Listener  in all of cases  all events are inside EDT including setEnabled setVisible    JComponent s  is are disabled visible if all Events in EDT ends   there are there ways  1  safiest way would be look for GlassPane  which prevents after all MouseEvents  not KeyEvents  best code around is by camickr s  2  use multithreading with SwingWorker for separate and delay concrete event s   Action from JComponent - gt  disable JComponent s  in GUI - gt  then required Action  but there  if is possible to adds  you have to identify all actions by using myAction putProperty  String   String     3  put Enabled Visible to the invokeLater   and all Action from Listener must be wrapped into invokeAndWait     4  inside Runnable   Thread

User · Answer

Rather than using booleans  why not just set the button to false when its clicked  so you do that in your actionPerformed method  Its more efficient    if  command equals  w          FileConverter fc   new FileConverter        btnConvertDocuments setEnabled false

User · Answer

import java awt BorderLayout  import java awt Component  import java awt Dimension   import javax swing JButton  import javax swing JFrame  import javax swing JPanel  import javax swing border EmptyBorder  import javax swing BoxLayout  import javax swing JSeparator  import java awt event ActionListener  import java awt event ActionEvent    public class IPGUI extends JFrame implements ActionListener        private static JPanel contentPane       private JButton btnConvertDocuments      private JButton btnExtractImages      private JButton btnParseRIDValues      private JButton btnParseImageInfo         Create the frame     public IPGUI                    Sets frame properties         setTitle  IP Extractor            setDefaultCloseOperation JFrame EXIT ON CLOSE           setBounds 100  100  250  300           contentPane   new JPanel            contentPane setBorder new EmptyBorder 5  5  5  5            contentPane setLayout new BorderLayout 0  0            setContentPane contentPane              Creates new JPanel with boxlayout         JPanel panel   new JPanel            contentPane add panel  BorderLayout CENTER           panel setLayout new BoxLayout panel  BoxLayout Y AXIS                               New Button                            JButton btnConvertDocuments   new JButton  1  Convert Documents            btnConvertDocuments setAlignmentX Component CENTER ALIGNMENT           btnConvertDocuments setMaximumSize new Dimension 160  0            btnConvertDocuments setPreferredSize new Dimension 0  50             panel add btnConvertDocuments            btnConvertDocuments setActionCommand  w            btnConvertDocuments addActionListener  ActionListener  this            JSeparator separator 3   new JSeparator            panel add separator 3                              New Button                            btnExtractImages   new JButton  2  Extract Images            btnExtractImages setAlignmentX Component CENTER ALIGNMENT           btnExtractImages setMaximumSize new Dimension 160  0            btnExtractImages setPreferredSize new Dimension 0  50             panel add btnExtractImages            btnExtractImages setActionCommand  x            btnExtractImages addActionListener  ActionListener  this            JSeparator separator 2   new JSeparator            panel add separator 2                              New Button                            JButton btnParseRIDValues   new JButton  3  Parse rId Values            btnParseRIDValues setAlignmentX Component CENTER ALIGNMENT           btnParseRIDValues setMaximumSize new Dimension 160  0            btnParseRIDValues setPreferredSize new Dimension 0  50             panel add btnParseRIDValues            btnParseRIDValues setActionCommand  y            btnParseRIDValues addActionListener  ActionListener  this            JSeparator separator 1   new JSeparator            panel add separator 1                              New Button                            JButton btnParseImageInfo   new JButton  4  Parse Image Info             btnParseImageInfo setAlignmentX Component CENTER ALIGNMENT           btnParseImageInfo setMaximumSize new Dimension 160  0            btnParseImageInfo setPreferredSize new Dimension 0  50             panel add btnParseImageInfo            btnParseImageInfo setActionCommand  z            btnParseImageInfo addActionListener  ActionListener  this              public void actionPerformed ActionEvent event                 String command   event getActionCommand             if  command equals  w                          FileConverter fc   new FileConverter                btnConvertDocuments setEnabled false                     else if  command equals  x                          ImageExtractor ie   new ImageExtractor                btnExtractImages setEnabled false                     else if  command equals  y                           XMLIDParser xip   new XMLIDParser                btnParseRIDValues setEnabled false                     else if  command equals  z                           XMLTagParser xtp   new XMLTagParser                btnParseImageInfo setEnabled false                                 Here is the solution I came up with thanks to everyone s help  Thank you again everyone for your input  really appreciate it

User · Answer

You create the frame with button enable  do some test to see if btn1Cliked is true  and that s all   Then you have the actionPerformed method that does nothing with your button  So  if you don t have any action related  your button status will never be evaluated again

User · Answer

You should put the statement btnConvertDocuments setEnabled false   in the actionPerformed ActionEvent event  method  Your conditional above only get call once in the constructor when IPGUI object is being instantiated   if  command equals  w          FileConverter fc   new FileConverter        btn1Clicked   true      btnConvertDocuments setEnabled false

User · Answer

Rather than using booleans  why not just set the button to false when its clicked  so you do that in your actionPerformed method  Its more efficient    if  command equals  w          FileConverter fc   new FileConverter        btnConvertDocuments setEnabled false

[java] How to Disable GUI Button in Java

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