How to use

onChange

method

in

com.google.gwt.event.dom.client.ChangeHandler

@Override
protected void dispatch(ChangeHandler handler) {
 handler.onChange(this);
}

  public void onChange(ChosenChangeEvent event) {
    handler.onChange(null);
  }
});

  public void onChange(ChosenChangeEvent event) {
    handler.onChange(null);
  }
});

private void fireChangeEvents() {
  for (ChangeHandler ch : changeHandlerList) {
    ch.onChange(null);
  }
}

  @Override
  public void onClick( ClickEvent event )
  {
    handler.onChange( null );
  }
} );

  @Override
  public void onClick( ClickEvent event )
  {
    handler.onChange( null );
  }
} );

  public void onChange(ChosenChangeEvent event) {
    handler.onChange(null);
  }
});

@Override
protected void dispatch(ChangeHandler handler) {
 handler.onChange(this);
}

@Override
protected void dispatch(ChangeHandler handler) {
 handler.onChange(this);
}

private void fireAllCellChangeHandlers(WSCell cell, Object newValue) {
 for (ChangeHandler c : cellChangeHandlers)
  c.onChange(new CellChangeEvent(cell, newValue));
}

@Override
public HandlerRegistration addChangeHandler(final ChangeHandler handler) {
  return valueBoxBase.addChangeHandler(event -> {
    if (isEnabled()) {
      handler.onChange(event);
    }
  });
}

@Override
public HandlerRegistration addChangeHandler(final ChangeHandler handler) {
  return valueBoxBase.addChangeHandler(event -> {
    if (isEnabled()) {
      handler.onChange(event);
    }
  });
}

private void fireAllAfterCellChangeHandlers(WSCell cell) {
 for (ChangeHandler c : afterCellChangeHandlers)
  c.onChange(new CellChangeEvent(cell, cell.getCellFormat().getValue()));
}

  private void testFileName(String fileInput,
               String expected) {
    when(file.getValue()).thenReturn(fileInput);
    fileUpload.getFileChangeHandler().onChange(mock(ChangeEvent.class));
    verify(fileText).setValue(expected);
  }
}

@Test
public void testChangeAllowedRules() throws Exception {
  when(configurationType.getSelectedIndex()).thenReturn(ConfigWidget.ALLOWED_INDEX);
  when(configurationType.getValue(ConfigWidget.ALLOWED_INDEX)).thenReturn("inc");
  configWidget.init(scenarioParentWidget, path, scenario);
  configWidget.setupHandlers();
  verify(configurationType).addChangeHandler(changeHandlerCaptor.capture());
  changeHandlerCaptor.getValue().onChange(null);
  verify(scenario).setInclusive(true);
  verify(addButton).setVisible(true);
  verify(removeButton).setVisible(true);
  verify(configuredRules).setVisible(true);
}

@Test
public void testChangePreventedRules() throws Exception {
  when(configurationType.getSelectedIndex()).thenReturn(ConfigWidget.PREVENTED_INDEX);
  when(configurationType.getValue(ConfigWidget.PREVENTED_INDEX)).thenReturn("exc");
  configWidget.init(scenarioParentWidget, path, scenario);
  configWidget.setupHandlers();
  verify(configurationType).addChangeHandler(changeHandlerCaptor.capture());
  changeHandlerCaptor.getValue().onChange(null);
  verify(scenario).setInclusive(false);
  verify(addButton).setVisible(true);
  verify(removeButton).setVisible(true);
  verify(configuredRules).setVisible(true);
}

@Test
public void testChangeAllowedRules() throws Exception {
  when(configurationType.getSelectedIndex()).thenReturn(ConfigWidget.ALLOWED_INDEX);
  when(configurationType.getValue(ConfigWidget.ALLOWED_INDEX)).thenReturn("inc");
  configWidget.init(scenarioParentWidget, path, scenario);
  configWidget.setupHandlers();
  verify(configurationType).addChangeHandler(changeHandlerCaptor.capture());
  changeHandlerCaptor.getValue().onChange(null);
  verify(scenario).setInclusive(true);
  verify(addButton).setVisible(true);
  verify(removeButton).setVisible(true);
  verify(configuredRules).setVisible(true);
}

@Test
public void testChangePreventedRules() throws Exception {
  when(configurationType.getSelectedIndex()).thenReturn(ConfigWidget.PREVENTED_INDEX);
  when(configurationType.getValue(ConfigWidget.PREVENTED_INDEX)).thenReturn("exc");
  configWidget.init(scenarioParentWidget, path, scenario);
  configWidget.setupHandlers();
  verify(configurationType).addChangeHandler(changeHandlerCaptor.capture());
  changeHandlerCaptor.getValue().onChange(null);
  verify(scenario).setInclusive(false);
  verify(addButton).setVisible(true);
  verify(removeButton).setVisible(true);
  verify(configuredRules).setVisible(true);
}

  @Test
  public void testChangeAllowAllRules() throws Exception {
    final List<String> rules = new ArrayList<String>() {{
      add("rule 1");
    }};
    when(scenario.getRules()).thenReturn(rules);
    when(configurationType.getSelectedIndex()).thenReturn(ConfigWidget.ALL_ALLOWED_INDEX);
    when(configurationType.getValue(ConfigWidget.ALL_ALLOWED_INDEX)).thenReturn("all");

    configWidget.init(scenarioParentWidget, path, scenario);
    configWidget.setupHandlers();
    verify(configurationType).addChangeHandler(changeHandlerCaptor.capture());
    changeHandlerCaptor.getValue().onChange(null);

    Assertions.assertThat(rules).isEmpty();
    verify(addButton).setVisible(false);
    verify(removeButton).setVisible(false);
    verify(configuredRules).setVisible(false);
    verify(configuredRules).clear();
  }
}

  @Test
  public void testChangeAllowAllRules() throws Exception {
    final List<String> rules = new ArrayList<String>() {{
      add("rule 1");
    }};
    when(scenario.getRules()).thenReturn(rules);
    when(configurationType.getSelectedIndex()).thenReturn(ConfigWidget.ALL_ALLOWED_INDEX);
    when(configurationType.getValue(ConfigWidget.ALL_ALLOWED_INDEX)).thenReturn("all");

    configWidget.init(scenarioParentWidget, path, scenario);
    configWidget.setupHandlers();
    verify(configurationType).addChangeHandler(changeHandlerCaptor.capture());
    changeHandlerCaptor.getValue().onChange(null);

    Assertions.assertThat(rules).isEmpty();
    verify(addButton).setVisible(false);
    verify(removeButton).setVisible(false);
    verify(configuredRules).setVisible(false);
    verify(configuredRules).clear();
  }
}