Java 类android.support.v4.widget.DrawerLayout.DrawerListener 实例源码

public static Observable<Irrelevant> close(final DrawerLayout drawer) {
    return Observable.create(emitter -> {
        drawer.closeDrawer(GravityCompat.START);
        DrawerListener listener = new DrawerLayout.SimpleDrawerListener() {
            @Override
            public void onDrawerSlide(View drawerView, float slideOffset) {
                if (slideOffset < OFFSET_THRESHOLD) {
                    emitter.onNext(Irrelevant.INSTANCE);
                    emitter.onComplete();
                    drawer.removeDrawerListener(this);
                }
            }
        };
        drawer.addDrawerListener(listener);
    });
}

/**
 * Returns a {@link ViewAction} that adds an {@link IdlingDrawerListener} as a drawer listener to
 * the {@link DrawerLayout}. The idling drawer listener wraps any listener that already exists.
 */
private static ViewAction registerListener() {
  return new ViewAction() {
    @Override
    public Matcher<View> getConstraints() {
      return isAssignableFrom(DrawerLayout.class);
    }

    @Override
    public String getDescription() {
      return "register idling drawer listener";
    }

    @Override
    public void perform(UiController uiController, View view) {
      DrawerLayout drawer = (DrawerLayout) view;
      DrawerListener existingListener = getDrawerListener(drawer);
      if (existingListener instanceof IdlingDrawerListener) {
        // listener is already registered. No need to assign.
        return;
      }
      drawer.setDrawerListener(IdlingDrawerListener.getInstance(existingListener));
    }
  };
}

private static IdlingDrawerListener getInstance(DrawerListener parentListener) {
  if (instance == null) {
    instance = new IdlingDrawerListener();
    Espresso.registerIdlingResources(instance);
  }
  instance.setParentListener(parentListener);
  return instance;
}

public void setDrawerListener(DrawerListener drawerListener, boolean oneTimeListener) {
    this.drawerListener = drawerListener;
    this.oneTimeListener = oneTimeListener; 
}

public final void setDrawerListener(DrawerLayout.DrawerListener paramDrawerListener)
{
  this.mDrawerListener = paramDrawerListener;
}

public void setParentListener(@Nullable DrawerListener parentListener) {
  this.parentListener = parentListener;
}