BaseGridWidgetKeyboardHandler.java 文件源码

@Override
public void onKeyDown(final KeyDownEvent event) {
    final GridWidget selectedGridWidget = getSelectedGridWidget();
    if (selectedGridWidget == null) {
        return;
    }

    final KeyboardOperation operation = getOperation(event);
    if (operation == null) {
        return;
    }

    final boolean redraw = operation.perform(selectedGridWidget,
                                             event.isShiftKeyDown(),
                                             event.isControlKeyDown());

    event.preventDefault();
    event.stopPropagation();

    flushDOMElements(selectedGridWidget);

    if (redraw) {
        gridLayer.draw();
    }
}