/*

 File: iPhoneOrientation.js 

 Abstract: Defines JavaScript functionality for the iPhoneOrientation sample.

           Detects iPhone or iPod touch orientation events, determines the devices' orientation,

           sets the html body's class attribute according to the current orientation, and

           displays a descriptive message on the "Handling iPhone or iPod touch Orientation Events" page.

 Version: <1.0>

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 */

/* updateOrientation checks the current orientation, sets the body's class attribute to portrait, landscapeLeft, or landscapeRight, 

   and displays a descriptive message on "Handling iPhone or iPod touch Orientation Events".  */

function updateOrientation()

{

    /*window.orientation returns a value that indicates whether iPhone is in portrait mode, landscape mode with the screen turned to the

      left, or landscape mode with the screen turned to the right. */

    var orientation=window.orientation;

    switch(orientation)

    {

        case 0:

                /* If in portrait mode, sets the body's class attribute to portrait. Consequently, all style definitions matching the body[class="portrait"] declaration

                   in the iPhoneOrientation.css file will be selected and used to style "Handling iPhone or iPod touch Orientation Events". */

                document.body.setAttribute("class","portrait");

                /* Add a descriptive message on "Handling iPhone or iPod touch Orientation Events"  */

                document.getElementById("currentOrientation").innerHTML="Now in portrait orientation (Home button on the bottom).";

                break;  

        case 90:

                /* If in landscape mode with the screen turned to the left, sets the body's class attribute to landscapeLeft. In this case, all style definitions matching the

                   body[class="landscapeLeft"] declaration in the iPhoneOrientation.css file will be selected and used to style "Handling iPhone or iPod touch Orientation Events". */

                document.body.setAttribute("class","landscapeLeft");

                document.getElementById("currentOrientation").innerHTML="Now in landscape orientation and turned to the left (Home button to the right).";

                break;

        case -90:   

                /* If in landscape mode with the screen turned to the right, sets the body's class attribute to landscapeRight. Here, all style definitions matching the 

                   body[class="landscapeRight"] declaration in the iPhoneOrientation.css file will be selected and used to style "Handling iPhone or iPod touch Orientation Events". */

                document.body.setAttribute("class","landscapeRight");

                document.getElementById("currentOrientation").innerHTML="Now in landscape orientation and turned to the right (Home button to the left).";

                break;

    }

}

// Point to the updateOrientation function when iPhone switches between portrait and landscape modes.

window.onorientationchange=updateOrientation;