| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except |
| * in compliance with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software distributed under the License |
| * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express |
| * or implied. See the License for the specific language governing permissions and limitations under |
| * the License. |
| */ |
| package android.support.v17.leanback.widget; |
| |
| /** |
| * Interface for receiving notification when a row or item becomes selected. The concept of |
| * current selection is different than focus. A row or item can be selected without having focus; |
| * for example, when a row header view gains focus then the corresponding row view becomes selected. |
| */ |
| public interface OnItemViewSelectedListener { |
| /** |
| * Called when the a row or a new item becomes selected. |
| * <p> |
| * For a non {@link ListRow} case, parameter item may be null. Event is fired when |
| * selection changes between rows, regardless if row view has focus or not. |
| * <p> |
| * For a {@link ListRow} case, parameter item is null if the list row is empty. |
| * </p> |
| * <p> |
| * In the case of a grid, the row parameter is always null. |
| * </p> |
| * <li> |
| * Row has focus: event is fired when focus changes between children of the row. |
| * </li> |
| * <li> |
| * No row has focus: the event is fired with the currently selected row and last |
| * focused item in the row. |
| * </li> |
| * |
| * @param itemViewHolder The view holder of the item that is currently selected. |
| * @param item The item that is currently selected. |
| * @param rowViewHolder The view holder of the row that is currently selected. |
| * @param row The row that is currently selected. |
| */ |
| public void onItemSelected(Presenter.ViewHolder itemViewHolder, Object item, |
| RowPresenter.ViewHolder rowViewHolder, Row row); |
| } |