/*
 * Copyright 2008 ZXing authors
 *
 * 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 com.google.zxing.client.android;

import android.app.Activity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.webkit.WebView;

/**
 * An HTML-based help screen.
 * 
 * @author dswitkin@google.com (Daniel Switkin)
 */
public final class HelpActivity extends Activity {

	private static final String BASE_URL = "file:///android_asset/html-" + LocaleManager.getTranslatedAssetLanguage() + '/';

	private WebView webView;

	@Override
	protected void onCreate(Bundle icicle) {
		super.onCreate(icicle);
		setContentView(R.layout.help);

		webView = (WebView) findViewById(R.id.help_contents);

		if (icicle == null) {
			webView.loadUrl(BASE_URL + "index.html");
		} else {
			webView.restoreState(icicle);
		}
	}

	@Override
	protected void onSaveInstanceState(Bundle state) {
		String url = webView.getUrl();
		if (url != null && !url.isEmpty()) {
			webView.saveState(state);
		}
	}

	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		if (keyCode == KeyEvent.KEYCODE_BACK && webView.canGoBack()) {
			webView.goBack();
			return true;
		}
		return super.onKeyDown(keyCode, event);
	}

}
