Digital Watch Sample Overview

The Digital Watch sample application demonstrates how you can create a simple digital watch application.

The following figure illustrates the main screen of the Digital Watch.

Figure: Digital Watch screen

The application opens with the main screen that shows the current time, date, and battery status.

When the ambient mode is enabled, the watch application with a limited UI can be displayed on the idle screen to reduce power consumption.

Prerequisites

To ensure proper application execution, the following privilege must be set:

• http://tizen.org/privilege/alarm

Source Files

You can create and view the sample application project, including the source files, in the IDE.

Implementation

Application Layout

Create the main page, which consists of battery, time, and date sections:

<!-- index.html -->
<div id='digital-body'>
   <div id='battery-rec'></div>
   <div id='battery-fill'></div>
   <div id='rec-time'>
      <div id='str-hours'></div>
      <div id='str-console'>:</div>
      <div id='str-minutes'></div>
      <div id='str-ampm'></div>
   </div>

   <div id='rec-string-time'>
      <div id='str-day'></div>
   </div>
</div>

Configuration

The config.xml file contains the application information required to install and launch the application. The category name (http://tizen.org/category/wearable_clock) defines the application to be installed as a wearable clock application.

To enable a custom UI for the ambient mode, set the ambient_support attribute to enable.

<?xml version="1.0" encoding="UTF-8"?>
<widget xmlns="http://www.w3.org/ns/widgets">
   <tizen:category name="http://tizen.org/category/wearable_clock" />
   <tizen:application id="PxRGFrcVm7.DigitalWatch" package="PxRGFrcVm7" 
                      required_version="2.3" ambient_support="enable"/>

   <!--Get timetick events, occuring once a minute to enable the UI to be updated-->
   <tizen:privilege name="http://tizen.org/privilege/alarm"/>
   <tizen:setting background-support="disable" encryption="disable" hwkey-event="enable"/>
</widget>

Battery Events

To handle battery events:

1. Add an event handler for the battery events:

   battery.addEventListener('chargingchange', getBatteryState);
   battery.addEventListener('chargingtimechange', getBatteryState);
   battery.addEventListener('dischargingtimechange', getBatteryState);
   battery.addEventListener('levelchange', getBatteryState);
   

2. Calculate the battery level using the battery.level attribute in the getBatteryState() method:

   function getBatteryState()
   {
      var batteryLevel = Math.floor(battery.level * 10),
          batteryFill = document.getElementById('battery-fill');
          batteryLevel = batteryLevel + 1;
          batteryFill.style.width = batteryLevel + "%";
   }
   

Current Time

To get the current time data:

1. Get the current time object:

   date = tizen.time.getCurrentDateTime();
   

2. Get the current weekday (MON - SUN):

   day = date.getDay();
   

3. Get the current month (0 - 11) and day (1 - 31):

   month = date.getMonth() + 1,
   day = date.getDate();
   

4. Get the current hour (0 - 23), minutes (0 - 59), and seconds (0 - 59):

   str_hours = date.getHours();
   str_minutes = date.getMinutes();
   str_second = date.getSeconds();
   

Ambient Events

To handle the ambient events:

• The ambientmodechanged event occurs as the status of the device screen power changes:

  /* Event listener for ambientmodechanged */
  window.addEventListener('ambientmodechanged', function(e)
  {
     if (e.detail.ambientMode === true)
     {
        /* Rendering the ambient mode UI */
        ambientDigitalWatch();
     }
     else
     {
        /* Rendering the normal UI */
        initDigitalWatch();
     }
  });
  

• The timetick event occurs at a 1-second interval in the ambient mode:

  /* Event listener for timetick */
  window.addEventListener('timetick', function()
  {
     ambientDigitalWatch();
  });