/*
* 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.app;
import android.support.annotation.ColorInt;
import android.support.v17.leanback.R;
import android.support.v17.leanback.widget.BrowseFrameLayout;
import android.support.v17.leanback.widget.OnChildLaidOutListener;
import android.support.v17.leanback.widget.OnItemViewClickedListener;
import android.support.v17.leanback.widget.OnItemViewSelectedListener;
import android.support.v17.leanback.widget.Presenter;
import android.support.v17.leanback.widget.Row;
import android.support.v17.leanback.widget.RowPresenter;
import android.support.v17.leanback.widget.TitleHelper;
import android.support.v17.leanback.widget.TitleView;
import android.support.v17.leanback.widget.VerticalGridPresenter;
import android.support.v17.leanback.widget.ObjectAdapter;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
/**
* A fragment for creating leanback vertical grids.
*
* <p>Renders a vertical grid of objects given a {@link VerticalGridPresenter} and
* an {@link ObjectAdapter}.
*/
public class VerticalGridFragment extends BrandedFragment {
private static final String TAG = "VerticalGridFragment";
private static boolean DEBUG = false;
private ObjectAdapter mAdapter;
private VerticalGridPresenter mGridPresenter;
private VerticalGridPresenter.ViewHolder mGridViewHolder;
private OnItemViewSelectedListener mOnItemViewSelectedListener;
private OnItemViewClickedListener mOnItemViewClickedListener;
private int mSelectedPosition = -1;
/**
* Sets the grid presenter.
*/
public void setGridPresenter(VerticalGridPresenter gridPresenter) {
if (gridPresenter == null) {
throw new IllegalArgumentException("Grid presenter may not be null");
}
mGridPresenter = gridPresenter;
mGridPresenter.setOnItemViewSelectedListener(mViewSelectedListener);
if (mOnItemViewClickedListener != null) {
mGridPresenter.setOnItemViewClickedListener(mOnItemViewClickedListener);
}
}
/**
* Returns the grid presenter.
*/
public VerticalGridPresenter getGridPresenter() {
return mGridPresenter;
}
/**
* Sets the object adapter for the fragment.
*/
public void setAdapter(ObjectAdapter adapter) {
mAdapter = adapter;
updateAdapter();
}
/**
* Returns the object adapter.
*/
public ObjectAdapter getAdapter() {
return mAdapter;
}
final private OnItemViewSelectedListener mViewSelectedListener =
new OnItemViewSelectedListener() {
@Override
public void onItemSelected(Presenter.ViewHolder itemViewHolder, Object item,
RowPresenter.ViewHolder rowViewHolder, Row row) {
int position = mGridViewHolder.getGridView().getSelectedPosition();
if (DEBUG) Log.v(TAG, "grid selected position " + position);
gridOnItemSelected(position);
if (mOnItemViewSelectedListener != null) {
mOnItemViewSelectedListener.onItemSelected(itemViewHolder, item,
rowViewHolder, row);
}
}
};
final private OnChildLaidOutListener mChildLaidOutListener =
new OnChildLaidOutListener() {
@Override
public void onChildLaidOut(ViewGroup parent, View view, int position, long id) {
if (position == 0) {
showOrHideTitle();
}
}
};
/**
* Sets an item selection listener.
*/
public void setOnItemViewSelectedListener(OnItemViewSelectedListener listener) {
mOnItemViewSelectedListener = listener;
}
private void gridOnItemSelected(int position) {
if (position != mSelectedPosition) {
mSelectedPosition = position;
showOrHideTitle();
}
}
private void showOrHideTitle() {
if (mGridViewHolder.getGridView().findViewHolderForAdapterPosition(mSelectedPosition)
== null) {
return;
}
if (!mGridViewHolder.getGridView().hasPreviousViewInSameRow(mSelectedPosition)) {
showTitle(true);
} else {
showTitle(false);
}
}
/**
* Sets an item clicked listener.
*/
public void setOnItemViewClickedListener(OnItemViewClickedListener listener) {
mOnItemViewClickedListener = listener;
if (mGridPresenter != null) {
mGridPresenter.setOnItemViewClickedListener(mOnItemViewClickedListener);
}
}
/**
* Returns the item clicked listener.
*/
public OnItemViewClickedListener getOnItemViewClickedListener() {
return mOnItemViewClickedListener;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
ViewGroup root = (ViewGroup) inflater.inflate(R.layout.lb_vertical_grid_fragment,
container, false);
setTitleView((TitleView) root.findViewById(R.id.browse_title_group));
return root;
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
ViewGroup gridDock = (ViewGroup) view.findViewById(R.id.browse_grid_dock);
mGridViewHolder = mGridPresenter.onCreateViewHolder(gridDock);
gridDock.addView(mGridViewHolder.view);
mGridViewHolder.getGridView().setOnChildLaidOutListener(mChildLaidOutListener);
updateAdapter();
}
private void setupFocusSearchListener() {
BrowseFrameLayout browseFrameLayout = (BrowseFrameLayout) getView().findViewById(
R.id.grid_frame);
browseFrameLayout.setOnFocusSearchListener(getTitleHelper().getOnFocusSearchListener());
}
@Override
public void onStart() {
super.onStart();
setupFocusSearchListener();
mGridViewHolder.getGridView().requestFocus();
}
@Override
public void onDestroyView() {
super.onDestroyView();
mGridViewHolder = null;
}
/**
* Sets the selected item position.
*/
public void setSelectedPosition(int position) {
mSelectedPosition = position;
if(mGridViewHolder != null && mGridViewHolder.getGridView().getAdapter() != null) {
mGridViewHolder.getGridView().setSelectedPositionSmooth(position);
}
}
private void updateAdapter() {
if (mGridViewHolder != null) {
mGridPresenter.onBindViewHolder(mGridViewHolder, mAdapter);
if (mSelectedPosition != -1) {
mGridViewHolder.getGridView().setSelectedPosition(mSelectedPosition);
}
}
}
}