CodeMirrorEditorWidget.java 文件源码

@Override
public HandlerRegistration addChangeHandler(final ChangeHandler handler) {
    if (!changeHandlerAdded) {
        changeHandlerAdded = true;
        this.codeMirror.on(this.editorOverlay, CHANGE, new EventHandlers.EventHandlerOneParameter<CMChangeEventOverlay>() {

            @Override
            public void onEvent(final CMChangeEventOverlay param) {
                LOG.fine("Change event - state clean=" + editorOverlay.getDoc().isClean(getGenerationMarker())
                         + " (generation=" + getGenerationMarker() + ").");
                fireChangeEvent();
            }
        });
    }
    return addHandler(handler, ChangeEvent.getType());
}