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package org.wordpress.android.ui.themes;
import android.app.Activity;
import android.app.Fragment;
import android.database.Cursor;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView.RecyclerListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.GridView;
import android.widget.TextView;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.ImageLoader.ImageContainer;
import com.android.volley.toolbox.ImageLoader.ImageListener;
import com.android.volley.toolbox.NetworkImageView;
import org.wordpress.android.R;
import org.wordpress.android.WordPress;
import org.wordpress.android.ui.themes.ThemeTabAdapter.ScreenshotHolder;
import org.wordpress.android.util.NetworkUtils;
import org.wordpress.android.util.helpers.SwipeToRefreshHelper;
import org.wordpress.android.util.helpers.SwipeToRefreshHelper.RefreshListener;
import org.wordpress.android.util.widgets.CustomSwipeRefreshLayout;
/**
* A fragment display the themes on a grid view.
*/
public class ThemeTabFragment extends Fragment implements OnItemClickListener, RecyclerListener {
public enum ThemeSortType {
TRENDING("Trending"),
NEWEST("Newest"),
POPULAR("Popular");
private String mTitle;
private ThemeSortType(String title) {
mTitle = title;
}
public String getTitle() {
return mTitle;
}
public static ThemeSortType getTheme(int position) {
if (position < ThemeSortType.values().length)
return ThemeSortType.values()[position];
else
return TRENDING;
}
}
public interface ThemeTabFragmentCallback {
public void onThemeSelected(String themeId);
}
protected static final String ARGS_SORT = "ARGS_SORT";
protected static final String ARGS_PAGE = "ARGS_PAGE";
protected static final String BUNDLE_SCROLL_POSTION = "BUNDLE_SCROLL_POSTION";
protected GridView mGridView;
protected TextView mEmptyView;
protected TextView mNoResultText;
protected ThemeTabAdapter mAdapter;
protected ThemeTabFragmentCallback mCallback;
protected int mSavedScrollPosition = 0;
private boolean mShouldRefreshOnStart;
private SwipeToRefreshHelper mSwipeToRefreshHelper;
public static ThemeTabFragment newInstance(ThemeSortType sort, int page) {
ThemeTabFragment fragment = new ThemeTabFragment();
Bundle args = new Bundle();
args.putInt(ARGS_SORT, sort.ordinal());
args.putInt(ARGS_PAGE, page);
fragment.setArguments(args);
return fragment;
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
mCallback = (ThemeTabFragmentCallback) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString() + " must implement ThemeTabFragmentCallback");
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.theme_tab_fragment, container, false);
setRetainInstance(true);
mNoResultText = (TextView) view.findViewById(R.id.theme_no_search_result_text);
mEmptyView = (TextView) view.findViewById(R.id.text_empty);
mGridView = (GridView) view.findViewById(R.id.theme_gridview);
mGridView.setRecyclerListener(this);
// swipe to refresh setup but not for the search view
if (!(this instanceof ThemeSearchFragment)) {
mSwipeToRefreshHelper = new SwipeToRefreshHelper(getActivity(), (CustomSwipeRefreshLayout) view.findViewById(
R.id.ptr_layout), new RefreshListener() {
@Override
public void onRefreshStarted() {
if (!isAdded()) {
return;
}
if (!NetworkUtils.checkConnection(getActivity())) {
mSwipeToRefreshHelper.setRefreshing(false);
mEmptyView.setText(R.string.no_network_title);
return;
}
if (getActivity() instanceof ThemeBrowserActivity) {
((ThemeBrowserActivity) getActivity()).fetchThemes(getArguments().getInt(ARGS_PAGE));
}
}
});
mSwipeToRefreshHelper.setRefreshing(mShouldRefreshOnStart);
}
restoreState(savedInstanceState);
return view;
}
public void setRefreshing(boolean refreshing) {
mShouldRefreshOnStart = refreshing;
if (mSwipeToRefreshHelper != null) {
mSwipeToRefreshHelper.setRefreshing(refreshing);
if (!refreshing) {
refreshView();
}
}
}
private void restoreState(Bundle savedInstanceState) {
if (savedInstanceState != null) {
mSavedScrollPosition = savedInstanceState.getInt(BUNDLE_SCROLL_POSTION, 0);
}
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
Cursor cursor = fetchThemes(getThemeSortType());
if (cursor == null) {
return;
}
mAdapter = new ThemeTabAdapter(getActivity(), cursor, false);
setEmptyViewVisible(mAdapter.getCount() == 0);
mGridView.setAdapter(mAdapter);
mGridView.setOnItemClickListener(this);
mGridView.setSelection(mSavedScrollPosition);
}
private void setEmptyViewVisible(boolean visible) {
if (getView() == null || !isAdded()) {
return;
}
mEmptyView.setVisibility(visible ? View.VISIBLE : View.GONE);
mGridView.setVisibility(visible ? View.GONE : View.VISIBLE);
if (visible && !NetworkUtils.isNetworkAvailable(getActivity())) {
mEmptyView.setText(R.string.no_network_title);
}
}
public void setEmptyViewText(int stringId) {
mEmptyView.setText(stringId);
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
if (mGridView != null)
outState.putInt(BUNDLE_SCROLL_POSTION, mGridView.getFirstVisiblePosition());
}
private ThemeSortType getThemeSortType() {
int sortType = ThemeSortType.TRENDING.ordinal();
if (getArguments().containsKey(ARGS_SORT)) {
sortType = getArguments().getInt(ARGS_SORT);
}
return ThemeSortType.getTheme(sortType);
}
/**
* Fetch themes for a given ThemeSortType.
*
* @return a db Cursor or null if current blog is null
*/
private Cursor fetchThemes(ThemeSortType themeSortType) {
if (WordPress.getCurrentBlog() == null) {
return null;
}
String blogId = String.valueOf(WordPress.getCurrentBlog().getRemoteBlogId());
switch (themeSortType) {
case POPULAR:
return WordPress.wpDB.getThemesPopularity(blogId);
case NEWEST:
return WordPress.wpDB.getThemesNewest(blogId);
case TRENDING:
default:
return WordPress.wpDB.getThemesTrending(blogId);
}
}
private void refreshView() {
Cursor cursor = fetchThemes(getThemeSortType());
if (cursor == null) {
return;
}
if (mAdapter == null) {
mAdapter = new ThemeTabAdapter(getActivity(), cursor, false);
}
if (mNoResultText.isShown()) {
mNoResultText.setVisibility(View.GONE);
}
mAdapter.changeCursor(cursor);
setEmptyViewVisible(mAdapter.getCount() == 0);
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Cursor cursor = ((ThemeTabAdapter) parent.getAdapter()).getCursor();
String themeId = cursor.getString(cursor.getColumnIndex("themeId"));
mCallback.onThemeSelected(themeId);
}
@Override
public void onMovedToScrapHeap(View view) {
// cancel image fetch requests if the view has been moved to recycler.
NetworkImageView niv = (NetworkImageView) view.findViewById(R.id.theme_grid_item_image);
if (niv != null) {
// this tag is set in the ThemeTabAdapter class
ScreenshotHolder tag = (ScreenshotHolder) niv.getTag();
if (tag != null && tag.requestURL != null) {
// need a listener to cancel request, even if the listener does nothing
ImageContainer container = WordPress.imageLoader.get(tag.requestURL, new ImageListener() {
@Override
public void onErrorResponse(VolleyError error) { }
@Override
public void onResponse(ImageContainer response, boolean isImmediate) { }
});
container.cancelRequest();
}
}
}
}
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