/*
* 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);
}