CODEWITHSUNDEEP
javaswingjcombobox
user235236
user235236

Reputation: 467

JComboBox mouseClicked on cell

I am trying to call a function when a user clicks (with the mouse) on an item in a JComboBox; however, I don't want this event fired for any keyboard events - I only want this fired for a click on a particular cell of the dropdown (I know about addActionListener and addItemListener, but these are fired for more events than I want).

EDIT: I should have specified that mouseClicked doesn't work either - no events seem to be fired (however, they were at one point but when that happened, they fired for clicks on the text field as well), but I thought that was assumed from the title.

I have also tried the solution given here (also doesn't work): Editable JCombobox mouseclicked event not working

EDIT2: I tried the following, but still no output on click:

try {
    Field popupInBasicComboBoxUI = BasicComboBoxUI.class.getDeclaredField("popup");
    popupInBasicComboBoxUI.setAccessible(true);
    BasicComboPopup popup = (BasicComboPopup)popupInBasicComboBoxUI.get(attachedCB.getUI());

    Field scrollerInBasicComboPopup = BasicComboPopup.class.getDeclaredField("scroller");
    scrollerInBasicComboPopup.setAccessible(true);
    JScrollPane scroller = (JScrollPane)scrollerInBasicComboPopup.get(popup);

    scroller.getViewport().getView().addMouseListener(new MouseAdapter() {
      @Override
      public void mouseClicked(MouseEvent e) {
        super.mouseClicked(e);
        System.out.println("nope");
      }
    });
  }
  catch (IllegalAccessException e) {
    e.printStackTrace();
  }
  catch (NoSuchFieldException e) {
    e.printStackTrace();
  }

Upvotes: 0

Views: 790

Answers (3)

Jayfray
Jayfray

Reputation: 405

You missed adding it to the scrollPane's viewport view in the link I posted in the comments. 

Field scrollerInBasicComboPopup = BasicComboPopup.class.getDeclaredField("scroller");
scrollerInBasicComboPopup.setAccessible(true);
JScrollPane scroller = (JScrollPane) scrollerInBasicComboPopup.get(popup);
scroller.getViewport().getView().addMouseListener(listener);

Upvotes: 2

ARA
ARA

Reputation: 1316

You should use java.awt.event.ActionEvent, which is (quoted from javadoc) a

semantic event which indicates that a component-defined action occurred. This high-level event is generated by a component (such as a Button) when the component-specific action occurs (such as being pressed)...

like this:

        jComboBox.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                javax.swing.JComboBox source = (javax.swing.JComboBox)evt.getSource();
                // use getSelectedIndex to know the item if needed
                labelTextField.setText(source.getSelectedItem().toString());
            }
        });

Note getSelectedItem and getSelectedIndex and getSelectedObjects methods : this allows you to know which item has been selected and process only the items you want

Upvotes: 0

Aditya
Aditya

Reputation: 2415

Hope this helps,

jComboBox.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                jComboBoxMouseClicked(evt);//your logic here
            }            
        });

Upvotes: 0

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