phaser/docs/DOM.js.html
2014-11-15 20:01:46 +00:00

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<h1 class="page-title">Source: D:/wamp/www/phaser/src/system/DOM.js</h1>
<section>
<article>
<pre class="sunlight-highlight-javascript linenums">/**
* @author Richard Davey &lt;rich@photonstorm.com>
* @copyright 2014 Photon Storm Ltd.
* @license {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
*/
/**
* DOM utility class.
*
* Provides a useful Window and Element functions as well as cross-browser compatibility buffer.
*
* @class Phaser.DOM
* @static
*/
Phaser.DOM = {
/**
* Get the DOM offset values of any given element
*
* @method Phaser.DOM.getOffset
* @param {DOMElement} element - The targeted element that we want to retrieve the offset.
* @param {Phaser.Point} [point] - The point we want to take the x/y values of the offset.
* @return {Phaser.Point} - A point objet with the offsetX and Y as its properties.
*/
getOffset: function (element, point) {
point = point || new Phaser.Point();
var box = element.getBoundingClientRect();
var clientTop = element.clientTop || document.body.clientTop || 0;
var clientLeft = element.clientLeft || document.body.clientLeft || 0;
// Without this check Chrome is now throwing console warnings about strict vs. quirks :(
var scrollTop = 0;
var scrollLeft = 0;
if (document.compatMode === 'CSS1Compat')
{
scrollTop = window.pageYOffset || document.documentElement.scrollTop || element.scrollTop || 0;
scrollLeft = window.pageXOffset || document.documentElement.scrollLeft || element.scrollLeft || 0;
}
else
{
scrollTop = window.pageYOffset || document.body.scrollTop || element.scrollTop || 0;
scrollLeft = window.pageXOffset || document.body.scrollLeft || element.scrollLeft || 0;
}
point.x = box.left + scrollLeft - clientLeft;
point.y = box.top + scrollTop - clientTop;
return point;
},
/**
* A cross-browser element.getBoundingClientRect method with optional cushion.
*
* Returns a plain object containing the properties `top/bottom/left/right/width/height` with respect to the top-left corner of the current viewport.
* Its properties match the native rectangle.
* The cushion parameter is an amount of pixels (+/-) to cushion the element.
* It adjusts the measurements such that it is possible to detect when an element is near the viewport.
*
* @method Phaser.DOM.getBounds
* @param {DOMElement|Object} element - The element or stack (uses first item) to get the bounds for. If none given it defaults to the Phaser game canvas.
* @param {number} [cushion] - A +/- pixel adjustment amount.
* @return {Object|boolean} A plain object containing the properties `top/bottom/left/right/width/height` or `false` if a non-valid element is given.
*/
getBounds: function (element, cushion) {
if (typeof cushion === 'undefined') { cushion = 0; }
element = element && !element.nodeType ? element[0] : element;
if (!element || element.nodeType !== 1)
{
return false;
}
else
{
return this.calibrate(element.getBoundingClientRect(), cushion);
}
},
/**
* Calibrates element coordinates for `inViewport` checks.
*
* @method Phaser.DOM.calibrate
* @private
* @param {Object} coords - An object containing the following properties: `{top: number, right: number, bottom: number, left: number}`
* @param {number} [cushion] - A value to adjust the coordinates by.
* @return {Object} The calibrated element coordinates
*/
calibrate: function (coords, cushion) {
cushion = +cushion || 0;
var output = { width: 0, height: 0, left: 0, right: 0, top: 0, bottom: 0 };
output.width = (output.right = coords.right + cushion) - (output.left = coords.left - cushion);
output.height = (output.bottom = coords.bottom + cushion) - (output.top = coords.top - cushion);
return output;
},
/**
* Get the viewport aspect ratio (or the aspect ratio of an object or element)
* @link http://w3.org/TR/css3-mediaqueries/#orientation
*
* @method Phaser.DOM.getAspectRatio
* @param {(DOMElement|Object)} [object=(viewport)] - Optional object. Must have public `width` and `height` properties or methods.
* @return {number} The aspect ratio.
*/
getAspectRatio: function (object) {
object = null == object ? this.getViewport() : 1 === object.nodeType ? this.getElementBounds(object) : object;
var w = object['width'];
var h = object['height'];
if (typeof w === 'function')
{
w = w.call(object);
}
if (typeof h === 'function')
{
h = h.call(object);
}
return w / h;
},
/**
* Get the viewport dimensions.
*
* @method Phaser.DOM#getViewport
* @protected
*/
getViewport: function () {
return {
width: this.viewportWidth,
height: this.viewportHeight
};
},
/**
* Tests if the given DOM element is within the viewport.
*
* The optional cushion parameter allows you to specify a distance.
*
* inViewport(element, 100) is `true` if the element is in the viewport or 100px near it.
* inViewport(element, -100) is `true` if the element is in the viewport or at least 100px near it.
*
* @method Phaser.DOM.inViewport
* @param {DOMElement|Object} element - The DOM element to check. If no element is given it defaults to the Phaser game canvas.
* @param {number} [cushion] - The cushion allows you to specify a distance within which the element must be within the viewport.
* @return {boolean} True if the element is within the viewport, or within `cushion` distance from it.
*/
inViewport: function (element, cushion) {
var r = this.getElementBounds(element, cushion);
return !!r && r.bottom >= 0 && r.right >= 0 && r.top &lt;= this.viewportWidth && r.left &lt;= this.viewportHeight;
},
/**
* Returns the device screen orientation.
*
* Orientation values: 'portrait-primary', 'landscape-primary', 'portrait-secondary', 'landscape-secondary'.
*
* Order of resolving:
* - Screen Orientation API, or variation of - Future track. Most desktop and mobile browsers.
* - Screen size ratio check - If fallback is 'screen', suited for desktops.
* - Viewport size ratio check - If fallback is 'viewport', suited for mobile.
* - window.orientation - If fallback is 'window.orientation', non-recommended track.
* - Media query
* - Viewport size ratio check (probably only IE9 and legacy mobile gets here..)
*
* See
* - https://w3c.github.io/screen-orientation/ (conflicts with mozOrientation/msOrientation)
* - https://developer.mozilla.org/en-US/docs/Web/API/Screen.orientation (mozOrientation)
* - http://msdn.microsoft.com/en-us/library/ie/dn342934(v=vs.85).aspx
* - https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Testing_media_queries
* - http://stackoverflow.com/questions/4917664/detect-viewport-orientation
* - http://www.matthewgifford.com/blog/2011/12/22/a-misconception-about-window-orientation
*
* @method Phaser.DOM.getScreenOrientation
* @protected
* @param {string} [primaryFallback=(none)] - Specify 'screen', 'viewport', or 'window.orientation'.
*/
getScreenOrientation: function (primaryFallback) {
var screen = window.screen;
var orientation = screen.orientation || screen.mozOrientation || screen.msOrientation;
if (orientation && typeof orientation.type === 'string')
{
// Screen Orientation API specification
return orientation.type;
}
else if (typeof orientation === 'string')
{
// moz/ms-orientation are strings
return orientation;
}
var PORTRAIT = 'portrait-primary';
var LANDSCAPE = 'landscape-primary';
if (primaryFallback === 'screen')
{
return (screen.height > screen.width) ? PORTRAIT : LANDSCAPE;
}
else if (primaryFallback === 'viewport')
{
return (this.viewportHeight > this.viewportWidth) ? PORTRAIT : LANDSCAPE;
}
else if (primaryFallback === 'window.orientation' && typeof window.orientation === 'number')
{
// This may change by device based on "natural" orientation.
return (window.orientation === 0 || window.orientation === 180) ? PORTRAIT : LANDSCAPE;
}
else if (window.matchMedia)
{
if (window.matchMedia("(orientation: portrait)").matches)
{
return PORTRAIT;
}
else if (window.matchMedia("(orientation: landscape)").matches)
{
return LANDSCAPE;
}
}
return (this.viewportHeight > this.viewportWidth) ? PORTRAIT : LANDSCAPE;
}
};
/**
* A cross-browser window.scrollX.
*
* @name Phaser.DOM.scrollX
* @property {number} scrollX
* @readonly
* @protected
*/
Object.defineProperty(Phaser.DOM, "scrollX", {
get: function () {
return window.pageXOffset || document.documentElement.scrollLeft;
}
});
/**
* A cross-browser window.scrollY.
*
* @name Phaser.DOM.scrollY
* @property {number} scrollY
* @readonly
* @protected
*/
Object.defineProperty(Phaser.DOM, "scrollY", {
get: function () {
return window.pageYOffset || document.documentElement.scrollTop;
}
});
/**
* Gets the viewport width in pixels.
*
* @name Phaser.DOM.viewportWidth
* @property {number} viewportWidth
* @readonly
* @protected
*/
Object.defineProperty(Phaser.DOM, "viewportWidth", {
get: function () {
var a = document.documentElement.clientWidth;
var b = window.innerWidth;
return a &lt; b ? b : a;
}
});
/**
* Gets the viewport height in pixels.
*
* @name Phaser.DOM.viewportHeight
* @property {number} viewportHeight
* @readonly
* @protected
*/
Object.defineProperty(Phaser.DOM, "viewportHeight", {
get: function () {
var a = document.documentElement.clientHeight;
var b = window.innerHeight;
return a &lt; b ? b : a;
}
});
/**
* Gets the document width in pixels.
*
* @name Phaser.DOM.documentWidth
* @property {number} documentWidth
* @readonly
* @protected
*/
Object.defineProperty(Phaser.DOM, "documentWidth", {
get: function () {
var d = document.documentElement;
return Math.max(d.clientWidth, d.offsetWidth, d.scrollWidth);
}
});
/**
* Gets the document height in pixels.
*
* @name Phaser.DOM.documentHeight
* @property {number} documentHeight
* @readonly
* @protected
*/
Object.defineProperty(Phaser.DOM, "documentHeight", {
get: function () {
var d = document.documentElement;
return Math.max(d.clientHeight, d.offsetHeight, d.scrollHeight);
}
});
</pre>
</article>
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Phaser Copyright © 2012-2014 Photon Storm Ltd.
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