/**
* Copyright (c) 2012-2013 Nokia Corporation. All rights reserved.
* Nokia and Nokia Connecting People are registered trademarks of Nokia Corporation.
* Oracle and Java are trademarks or registered trademarks of Oracle and/or its
* affiliates. Other product and company names mentioned herein may be trademarks
* or trade names of their respective owners.
* See LICENSE.TXT for license information.
*/
package com.nokia.example.weatherapp.views;
import com.nokia.example.weatherapp.components.IconCommandFactory;
import com.nokia.example.weatherapp.components.ViewStack;
import com.nokia.example.weatherapp.resources.Resources;
import com.nokia.example.weatherapp.resources.Settings;
import com.nokia.mid.ui.IconCommand;
import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.AlertType;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
/**
* Singleton class for handling application views. Handles view switching.
*/
public class ViewMaster
implements CommandListener {
public static final int VIEW_NOVIEW = -1;
public static final int VIEW_WEATHER = 0;
public static final int VIEW_SETTINGS = 1;
public static final int VIEW_LOCATIONS = 2;
public static final int VIEW_TEMPERATURE = 3;
public static final int VIEW_WIND = 4;
public static final int VIEW_SEARCH = 5;
private static ViewMaster self = null;
private int activeView = VIEW_NOVIEW;
private final Command backCmd = new Command("Back", Command.BACK, 1);
private final Command cancelCmd = new Command("Cancel", Command.CANCEL, 1);
private final Command settingsCmd = new Command("Settings", Command.SCREEN, 2);
private final Command locationCmd = new Command("Location", Command.SCREEN, 1);
private final Command goCmd = new Command("GO", Command.OK, 1);
private Command addCmd = new Command("Add", Command.SCREEN, 2);
private Display display;
private WeatherView weatherView;
private SettingsView settingsView;
private LocationsView locationsView;
private SearchView searchView;
private ViewStack viewStack = new ViewStack();
private ViewMaster() {
}
/**
* Returns and/or instantiates ViewMaster object
* @return
*/
public static ViewMaster getInstance() {
if (self == null) {
self = new ViewMaster();
self.initialize();
}
return self;
}
public Display getDisplay() {
return display;
}
public void setDisplay(Display d) {
this.display = d;
searchView.setDisplay(d);
}
/**
* Returns view instance according to given ID
* @param id view ID
* @return View
*/
public Displayable getView(int id) {
switch (id) {
case VIEW_SETTINGS:
return settingsView;
case VIEW_LOCATIONS:
return locationsView;
case VIEW_SEARCH:
return searchView;
default:
return weatherView;
}
}
/**
* Activates previous view
*/
public synchronized void backView() {
setView(viewStack.popView());
}
/**
* Opens a view according to ID and pushes it to view stack
* @param id View ID
*/
public synchronized void openView(int id) {
if (id != activeView) {
viewStack.pushView(activeView);
setView(id);
}
}
/**
* Handles command actions
* @param cmd Selected command
* @param dsplbl The Displayable on which this event has occurred
*/
public void commandAction(Command cmd, Displayable dsplbl) {
if (cmd == backCmd || cmd == cancelCmd) {
if (activeView == VIEW_WEATHER) {
if (weatherView.getDay() != 0) {
weatherView.setDay(weatherView.getDay() - 1);
} else {
weatherView.showAdAndExit();
}
} else {
backView();
}
}
else if (cmd == locationCmd) {
openLocationsView();
}
else if (cmd == settingsCmd) {
openView(VIEW_SETTINGS);
}
else if (cmd == addCmd && activeView == VIEW_LOCATIONS) {
openView(VIEW_SEARCH);
}
else if (cmd == goCmd) {
weatherView.launchAdEndpoint();
}
}
/**
* Starts location retrieval
*/
public void startLocationFinder() {
weatherView.startOrUpdateLocationFinder();
}
/**
* Displays an alert
* @param title Title of the alert
* @param alertText The actual content of the alert
* @param type Type of the alert
*/
public void showAlert(String title, String alertText, AlertType type) {
if (!weatherView.isClosing()) {
final Alert alert = new Alert(title, alertText, null, type);
display.setCurrent(alert, getView(activeView));
}
}
public void openLocationsView() {
if (Settings.recentLocations.isEmpty()) {
openView(ViewMaster.VIEW_SEARCH);
}
else {
openView(ViewMaster.VIEW_LOCATIONS);
}
}
/**
* Instantiates all the views and sets commands to them
*/
private void initialize() {
weatherView = new WeatherView();
weatherView.addCommand(settingsCmd);
weatherView.addCommand(locationCmd);
weatherView.addCommand(backCmd);
weatherView.setCommandListener(this);
settingsView = new SettingsView();
settingsView.addCommand(backCmd);
settingsView.setCommandListener(this);
locationsView = new LocationsView();
// Replace the add command with platform specific commands
if (System.getProperty("microedition.platform").indexOf("sw_platform=S60;sw_platform_version=5.3") > -1) {
// Prevent Add turning into a check mark on Symbian Belle
addCmd = new Command("Add", Command.EXIT, 2);
}
Resources r = Resources.getInstance(locationsView.getWidth(), locationsView.getHeight());
if (IconCommandFactory.iconCommandsSupported()) {
addCmd = IconCommandFactory.getIconCommand("Add", r.getAddIcon(), r.getAddIcon(), IconCommand.SCREEN, 1);
}
locationsView.addCommand(addCmd);
locationsView.addCommand(backCmd);
locationsView.setCommandListener(this);
searchView = new SearchView();
searchView.addCommand(cancelCmd);
searchView.setCommandListener(this);
}
/**
* Sets a view to be displayed on the screen
* @param id View ID
*/
private synchronized void setView(int id) {
// Deactivate previous one
View current = (View) getView(activeView);
current.deactivate();
final Displayable next = getView(id);
display.setCurrent(next);
// Activate the next one
activeView = id;
((View) next).activate();
}
/**
* Appends or removes the GO-command button to weather view
*/
public void showGoCommmand(boolean show) {
if (show) {
weatherView.addCommand(goCmd);
}
else {
weatherView.removeCommand(goCmd);
}
}
}