Interface EventFocusChangedListenerIf

EventFocusChangedListenerIf is an interface that defines a contract for classes that wish to listen for changes in focus in a tabular data structure, such as a data grid or spreadsheet. Listener classes should implement the onFocusChanged method which would be triggered whenever focus changes in the data grid.

Overview

This interface ensures a consistent API for classes that need to react to changes in focus in the data grid. The table grid or data grid components will typically iterate over an array of EventFocusChangedListenerIf listeners and call the onFocusChanged method on each one when the focus within the grid changes. This could be due to user interactions such as clicking on a different cell or programmatically changing the cell focus.

Usage

Implement EventFocusChangedListenerIf if you want to create a class that reacts to changes in focus.

class MyFocusChangeListener implements EventFocusChangedListenerIf {
  onFocusChanged(model: FocusModelIf): void {
    console.log('Focus changed: ', model.getFocus());
  }
}
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Use the addEventFocusChangedListener method from FocusModelIf to add your listener to the queue.

focusModel.addEventFocusChangedListener(new MyFocusChangeListener());
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See Also

• FocusModelIf for focus management.
• EventAdapter for a class that implements this and other listener interfaces.

Method

onFocusChanged - method to be called with an instance of the FocusModelIf interface whenever a focus event occurs