transdroid/app/src/main/java/org/transdroid/core/gui/navigation/SetLabelDialog.java

/* 
 * Copyright 2010-2013 Eric Kok et al.
 * 
 * Transdroid is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * Transdroid is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with Transdroid.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.transdroid.core.gui.navigation;

import android.app.AlertDialog;
import android.app.Dialog;
import android.app.DialogFragment;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.EditText;
import android.widget.ListView;

import com.nispok.snackbar.Snackbar;
import com.nispok.snackbar.SnackbarManager;

import org.transdroid.R;
import org.transdroid.core.gui.lists.SimpleListItem;

import java.security.InvalidParameterException;
import java.util.Iterator;
import java.util.List;

/**
 * A dialog fragment that allows picking a label or entering a new label to set this new label to the torrent.
 * @author Eric Kok
 */
public class SetLabelDialog extends DialogFragment {

	private OnLabelPickedListener onLabelPickedListener = null;
	private List<? extends SimpleListItem> currentLabels = null;

	public SetLabelDialog() {
		setRetainInstance(true);
	}

	/**
	 * Sets the callback for when the user is has picked a label for the target torrent.
	 * @param onLabelPickedListener The event listener to this dialog
	 * @return This dialog, for method chaining
	 */
	public SetLabelDialog setOnLabelPickedListener(OnLabelPickedListener onLabelPickedListener) {
		this.onLabelPickedListener = onLabelPickedListener;
		return this;
	}

	/**
	 * Sets the list of currently known labels as are active on the server. These are offered to the user to pick a new label for the target
	 * torrents.
	 * @param currentLabels The list of torrent labels
	 * @return This dialog, for method chaining
	 */
	public SetLabelDialog setCurrentLabels(List<Label> currentLabels) {
		// Discard the empty label in this list before storing it locally
		for (Iterator<Label> iter = currentLabels.iterator(); iter.hasNext(); ) {
			if (iter.next().isEmptyLabel()) {
				iter.remove();
			}
		}
		this.currentLabels = currentLabels;
		return this;
	}

	@Override
	public Dialog onCreateDialog(Bundle savedInstanceState) {
		if (onLabelPickedListener == null) {
			throw new InvalidParameterException("Please first set the callback listener using setOnLabelPickedListener before opening the dialog.");
		}
		if (currentLabels == null) {
			throw new InvalidParameterException(
					"Please first set the list of currently known labels before opening the dialog, even if the list is empty.");
		}
		final View setlabelFrame = getActivity().getLayoutInflater().inflate(R.layout.dialog_setlabel, null, false);
		final ListView labelsList = (ListView) setlabelFrame.findViewById(R.id.labels_list);
		final EditText newlabelEdit = (EditText) setlabelFrame.findViewById(R.id.newlabel_edit);
		if (currentLabels.size() == 0) {
			// Hide the list (and its label) if there are no labels yet
			setlabelFrame.findViewById(R.id.pick_label).setVisibility(View.GONE);
			setlabelFrame.findViewById(R.id.line1).setVisibility(View.GONE);
			setlabelFrame.findViewById(R.id.line2).setVisibility(View.GONE);
			labelsList.setVisibility(View.GONE);
		} else {
			labelsList.setAdapter(new FilterListItemAdapter(getActivity(), currentLabels));
			labelsList.setOnItemClickListener(new OnItemClickListener() {
				@Override
				public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
					onLabelPickedListener.onLabelPicked(((Label) labelsList.getItemAtPosition(position)).getName());
					dismiss();
				}
			});
		}
		return new AlertDialog.Builder(getActivity()).setView(setlabelFrame).setPositiveButton(R.string.status_update, new OnClickListener() {
			@Override
			public void onClick(DialogInterface dialog, int which) {
				// User should have provided a new label
				if (newlabelEdit.getText().toString().equals("")) {
					SnackbarManager.show(Snackbar.with(getActivity()).text(R.string.error_notalabel).colorResource(R.color.crouton_error));
					return;
				}
				onLabelPickedListener.onLabelPicked(newlabelEdit.getText().toString());
			}
		}).setNeutralButton(R.string.status_label_remove, new OnClickListener() {
			@Override
			public void onClick(DialogInterface dialog, int which) {
				onLabelPickedListener.onLabelPicked(null);
			}
		}).setNegativeButton(android.R.string.cancel, null).show();
	}

	public interface OnLabelPickedListener {
		public void onLabelPicked(String newLabel);
	}

}