CODEWITHSUNDEEP
javaswing
Nasir
Nasir

Reputation: 533

call component Listener manually

I add a listener to JCheckBox component and I want call listener manually.how do it?

myCheckBox.selected(false)

then I want to called myCheckBox listener. Do you have better idea?

Upvotes: 3

Views: 3349

Answers (3)

RobotKarel314
RobotKarel314

Reputation: 417

Instead of trying to call the Listener, why not just use a separate method?

ItemListener listener = new ItemListener() {
   public void itemStateChanged(ItemEvent e) {
      method();
   }
};
public void method() {
   //code you want to run
}

Then just call method() when you want to run the code separate from the Listener.

Upvotes: 0

Lord Farquaad
Lord Farquaad

Reputation: 707

I know I'm a bit late, but this should do the trick:

ItemListener listener = new ItemListener() {
    public void itemStateChanged(ItemEvent e) {
         //whatever your itemStateChanged() looks like.
    }
};
JCheckBox checkBox = new JCheckBox();
checkBox.addItemListener(listener);

Then, whenever you need to call it manually:

listener.itemStateChanged(
                new ItemEvent(checkBox, ItemEvent.ITEM_STATE_CHANGED, checkBox, 0));

If you created your listener anonymously, you can still access it like:

checkBox.getItemListeners()[0].itemStateChanged(
                new ItemEvent(checkBox, ItemEvent.ITEM_STATE_CHANGED, checkBox, 0));

Upvotes: 6

cpater
cpater

Reputation: 1099

I really don't know what checkBox component you use. You don't tell us which framework do you use or provide other helpful context infos.

But in general: Your listener is impl. an interface. This interface defines the callbackmethod that your component (checkBox) calls.

If you have a instance of your listener obj. you can call this method directly.

Upvotes: 0

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