ultrasonic-app-subsonic-android/src/com/thejoshwa/ultrasonic/androidapp/activity/HelpActivity.java

/*
 This file is part of Subsonic.

 Subsonic 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.

 Subsonic 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 Subsonic.  If not, see <http://www.gnu.org/licenses/>.

 Copyright 2009 (C) Sindre Mehus
 */

package com.thejoshwa.ultrasonic.androidapp.activity;

import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
import android.widget.ImageView;
import com.thejoshwa.ultrasonic.androidapp.R;
import com.thejoshwa.ultrasonic.androidapp.util.Constants;
import com.thejoshwa.ultrasonic.androidapp.util.Util;
import net.simonvt.menudrawer.MenuDrawer;
import net.simonvt.menudrawer.Position;

/**
 * An HTML-based help screen with Back and Done buttons at the bottom.
 *
 * @author Sindre Mehus
 */
public final class HelpActivity extends Activity implements OnClickListener {
	private static final String TAG = HelpActivity.class.getSimpleName();
    private WebView webView;
    private ImageView backButton;
    private ImageView stopButton;
    private ImageView forwardButton;
    
    private static final String STATE_MENUDRAWER = "com.thejoshwa.ultrasonic.androidapp.menuDrawer";
    private static final String STATE_ACTIVE_VIEW_ID = "com.thejoshwa.ultrasonic.androidapp.activeViewId";
    private static final String STATE_ACTIVE_POSITION = "com.thejoshwa.ultrasonic.androidapp.activePosition";
    
    public MenuDrawer menuDrawer;    
    private int activePosition = 1;
    private int menuActiveViewId;
    View chatMenuItem = null;
    View bookmarksMenuItem = null;
    View menuMain = null;

    @Override
    protected void onCreate(Bundle bundle) {
        applyTheme();
        super.onCreate(bundle);
        getWindow().requestFeature(Window.FEATURE_INDETERMINATE_PROGRESS);

        setContentView(R.layout.help);
        
        if (bundle != null) {
            activePosition = bundle.getInt(STATE_ACTIVE_POSITION);
            menuActiveViewId = bundle.getInt(STATE_ACTIVE_VIEW_ID);
        }
        
        menuDrawer = MenuDrawer.attach(this, MenuDrawer.MENU_DRAG_WINDOW, Position.LEFT);
        menuDrawer.setMenuView(R.layout.menu_main);
        
        chatMenuItem = findViewById(R.id.menu_chat);
        bookmarksMenuItem = findViewById(R.id.menu_bookmarks);
        
        findViewById(R.id.menu_home).setOnClickListener(this);
        findViewById(R.id.menu_browse).setOnClickListener(this);
        findViewById(R.id.menu_search).setOnClickListener(this);
        findViewById(R.id.menu_playlists).setOnClickListener(this);
        chatMenuItem.setOnClickListener(this);
        bookmarksMenuItem.setOnClickListener(this);
        findViewById(R.id.menu_now_playing).setOnClickListener(this);
        findViewById(R.id.menu_settings).setOnClickListener(this);
        findViewById(R.id.menu_about).setOnClickListener(this);
        findViewById(R.id.menu_exit).setOnClickListener(this);

        getActionBar().setDisplayHomeAsUpEnabled(true);
        
        View aboutMenuItem = findViewById(R.id.menu_about);
        menuDrawer.setActiveView(aboutMenuItem);
        
        webView = (WebView) findViewById(R.id.help_contents);
        webView.getSettings().setJavaScriptEnabled(true);
        webView.setWebViewClient(new HelpClient());
        
        if (bundle != null) {
            webView.restoreState(bundle);
        } else {
            webView.loadUrl(getResources().getString(R.string.help_url));
        }

        backButton = (ImageView) findViewById(R.id.help_back);
        backButton.setOnClickListener(new Button.OnClickListener() {
            @Override
            public void onClick(View view) {
                webView.goBack();
            }
        });
        
        stopButton = (ImageView) findViewById(R.id.help_stop);
        stopButton.setOnClickListener(new Button.OnClickListener() {
            @Override
            public void onClick(View view) {
                webView.stopLoading();
                setProgressBarIndeterminateVisibility(false);
            }
        });

        forwardButton = (ImageView) findViewById(R.id.help_forward);
        forwardButton.setOnClickListener(new Button.OnClickListener() {
            @Override
            public void onClick(View view) {
                webView.goForward();
            }
        });        
    }
    
	@Override
	protected void onPostCreate(Bundle bundle) {
		super.onPostCreate(bundle);
        
        int visibility = Util.isOffline(this) ? View.GONE : View.VISIBLE;
        chatMenuItem.setVisibility(visibility);
        bookmarksMenuItem.setVisibility(visibility);
	}

    @Override
    public void onResume() {
        super.onResume();
    }

    @Override
    protected void onSaveInstanceState(Bundle state) {
        webView.saveState(state);
        super.onSaveInstanceState(state);
        state.putParcelable(STATE_MENUDRAWER, menuDrawer.saveState());
        state.putInt(STATE_ACTIVE_VIEW_ID, menuActiveViewId);
        state.putInt(STATE_ACTIVE_POSITION, activePosition);
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK) {
            if (webView.canGoBack()) {
                webView.goBack();
                return true;
            }
        }
        return super.onKeyDown(keyCode, event);
    }
    
    private void applyTheme() {
        String theme = Util.getTheme(this);
        
        if ("dark".equalsIgnoreCase(theme) || "fullscreen".equalsIgnoreCase(theme)) {
            setTheme(R.style.UltraSonicTheme);
        } else if ("light".equalsIgnoreCase(theme) || "fullscreenlight".equalsIgnoreCase(theme)) {
            setTheme(R.style.UltraSonicTheme_Light);
        }
    }
    
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        	case android.R.id.home:
        		menuDrawer.toggleMenu();
        		return true;
        }

        return super.onOptionsItemSelected(item);
    }
    
    @Override
    protected void onRestoreInstanceState(Bundle state) {
        super.onRestoreInstanceState(state);
        menuDrawer.restoreState(state.getParcelable(STATE_MENUDRAWER));
    }

    @Override
    public void onBackPressed() {
        final int drawerState = menuDrawer.getDrawerState();
        
        if (drawerState == MenuDrawer.STATE_OPEN || drawerState == MenuDrawer.STATE_OPENING) {
            menuDrawer.closeMenu();
            return;
        }
        
        finish();

        super.onBackPressed();
    }

    @Override
    public void onClick(View v) {
        menuActiveViewId = v.getId();
        
        Intent intent;
        
        switch (menuActiveViewId) {
    		case R.id.menu_home:
    			intent = new Intent(this, MainActivity.class);
    			intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    			Util.startActivityWithoutTransition(this, intent);
    			break;
    		case R.id.menu_browse:
    			intent = new Intent(this, SelectArtistActivity.class);
    			intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    			Util.startActivityWithoutTransition(this, intent);
    			break;
    		case R.id.menu_search:
    			intent = new Intent(this, SearchActivity.class);
    			intent.putExtra(Constants.INTENT_EXTRA_REQUEST_SEARCH, true);
    			Util.startActivityWithoutTransition(this, intent);
    			break;
    		case R.id.menu_playlists:
    			intent = new Intent(this, SelectPlaylistActivity.class);
    			intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    			Util.startActivityWithoutTransition(this, intent);
    			break;
    		case R.id.menu_chat:
    			Util.startActivityWithoutTransition(this, ChatActivity.class);
    			break;
    		case R.id.menu_bookmarks:
    			Util.startActivityWithoutTransition(this, BookmarkActivity.class);
    			break;     			
    		case R.id.menu_now_playing:
    			Util.startActivityWithoutTransition(this, DownloadActivity.class);
    			break;
    		case R.id.menu_settings:
    			Util.startActivityWithoutTransition(this, SettingsActivity.class);
    			break;
    		case R.id.menu_about:
    			Util.startActivityWithoutTransition(this, HelpActivity.class);
    			break;
    		case R.id.menu_exit:
    			intent = new Intent(this, MainActivity.class);
    			intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    			intent.putExtra(Constants.INTENT_EXTRA_NAME_EXIT, true);
    			Util.startActivityWithoutTransition(this, intent);
    			break;
        }
        
        menuDrawer.closeMenu();
    }

    private final class HelpClient extends WebViewClient {
        @Override
        public void onLoadResource(WebView webView, String url) {
            setProgressBarIndeterminateVisibility(true);
            super.onLoadResource(webView, url);
        }

        @Override
        public void onPageFinished(WebView view, String url) {
            setProgressBarIndeterminateVisibility(false);
            String versionName = null;
            
    		try {
    			versionName = getPackageManager().getPackageInfo(getPackageName(), 0).versionName;
    		} catch (NameNotFoundException e) {
    			Log.e(TAG, e.getMessage(), e);
    		}
    		
    		String title = view.getTitle() + " (" + versionName + ")";
    		getActionBar().setSubtitle(title);
    		
            backButton.setEnabled(view.canGoBack());
            forwardButton.setEnabled(view.canGoForward());
        }

        @Override
        public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
            Util.toast(HelpActivity.this, description);
        }
    }
}