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| // FIXME add tests for browser features (Modernizr?)
goog.provide('ol.dom');
goog.provide('ol.dom.BrowserFeature');
goog.require('goog.asserts');
goog.require('goog.dom');
goog.require('goog.userAgent');
goog.require('goog.vec.Mat4');
goog.require('ol');
/**
* Create an html canvas element and returns its 2d context.
* @param {number=} opt_width Canvas width.
* @param {number=} opt_height Canvas height.
* @return {CanvasRenderingContext2D}
*/
ol.dom.createCanvasContext2D = function(opt_width, opt_height) {
var canvas = goog.dom.createElement('CANVAS');
if (opt_width) {
canvas.width = opt_width;
}
if (opt_height) {
canvas.height = opt_height;
}
return canvas.getContext('2d');
};
/**
* Detect 2d transform.
* Adapted from http://stackoverflow.com/q/5661671/130442
* http://caniuse.com/#feat=transforms2d
* @return {boolean}
*/
ol.dom.canUseCssTransform = (function() {
var canUseCssTransform;
return function() {
if (canUseCssTransform === undefined) {
goog.asserts.assert(document.body,
'document.body should not be null');
if (!goog.global.getComputedStyle) {
// this browser is ancient
canUseCssTransform = false;
} else {
var el = goog.dom.createElement('P'),
has2d,
transforms = {
'webkitTransform': '-webkit-transform',
'OTransform': '-o-transform',
'msTransform': '-ms-transform',
'MozTransform': '-moz-transform',
'transform': 'transform'
};
document.body.appendChild(el);
for (var t in transforms) {
if (t in el.style) {
el.style[t] = 'translate(1px,1px)';
has2d = goog.global.getComputedStyle(el).getPropertyValue(
transforms[t]);
}
}
goog.dom.removeNode(el);
canUseCssTransform = (has2d && has2d !== 'none');
}
}
return canUseCssTransform;
};
}());
/**
* Detect 3d transform.
* Adapted from http://stackoverflow.com/q/5661671/130442
* http://caniuse.com/#feat=transforms3d
* @return {boolean}
*/
ol.dom.canUseCssTransform3D = (function() {
var canUseCssTransform3D;
return function() {
if (canUseCssTransform3D === undefined) {
goog.asserts.assert(document.body,
'document.body should not be null');
if (!goog.global.getComputedStyle) {
// this browser is ancient
canUseCssTransform3D = false;
} else {
var el = goog.dom.createElement('P'),
has3d,
transforms = {
'webkitTransform': '-webkit-transform',
'OTransform': '-o-transform',
'msTransform': '-ms-transform',
'MozTransform': '-moz-transform',
'transform': 'transform'
};
document.body.appendChild(el);
for (var t in transforms) {
if (t in el.style) {
el.style[t] = 'translate3d(1px,1px,1px)';
has3d = goog.global.getComputedStyle(el).getPropertyValue(
transforms[t]);
}
}
goog.dom.removeNode(el);
canUseCssTransform3D = (has3d && has3d !== 'none');
}
}
return canUseCssTransform3D;
};
}());
/**
* @param {Element} element Element.
* @param {string} value Value.
*/
ol.dom.setTransform = function(element, value) {
var style = element.style;
style.WebkitTransform = value;
style.MozTransform = value;
style.OTransform = value;
style.msTransform = value;
style.transform = value;
// IE 9+ seems to assume transform-origin: 100% 100%; for some unknown reason
if (goog.userAgent.IE && goog.userAgent.isVersionOrHigher('9.0')) {
element.style.transformOrigin = '0 0';
}
};
/**
* @param {!Element} element Element.
* @param {goog.vec.Mat4.Number} transform Matrix.
* @param {number=} opt_precision Precision.
*/
ol.dom.transformElement2D = function(element, transform, opt_precision) {
// using matrix() causes gaps in Chrome and Firefox on Mac OS X, so prefer
// matrix3d()
var i;
if (ol.dom.canUseCssTransform3D()) {
var value3D;
if (opt_precision !== undefined) {
/** @type {Array.<string>} */
var strings3D = new Array(16);
for (i = 0; i < 16; ++i) {
strings3D[i] = transform[i].toFixed(opt_precision);
}
value3D = strings3D.join(',');
} else {
value3D = transform.join(',');
}
ol.dom.setTransform(element, 'matrix3d(' + value3D + ')');
} else if (ol.dom.canUseCssTransform()) {
/** @type {Array.<number>} */
var transform2D = [
goog.vec.Mat4.getElement(transform, 0, 0),
goog.vec.Mat4.getElement(transform, 1, 0),
goog.vec.Mat4.getElement(transform, 0, 1),
goog.vec.Mat4.getElement(transform, 1, 1),
goog.vec.Mat4.getElement(transform, 0, 3),
goog.vec.Mat4.getElement(transform, 1, 3)
];
var value2D;
if (opt_precision !== undefined) {
/** @type {Array.<string>} */
var strings2D = new Array(6);
for (i = 0; i < 6; ++i) {
strings2D[i] = transform2D[i].toFixed(opt_precision);
}
value2D = strings2D.join(',');
} else {
value2D = transform2D.join(',');
}
ol.dom.setTransform(element, 'matrix(' + value2D + ')');
} else {
element.style.left =
Math.round(goog.vec.Mat4.getElement(transform, 0, 3)) + 'px';
element.style.top =
Math.round(goog.vec.Mat4.getElement(transform, 1, 3)) + 'px';
// TODO: Add scaling here. This isn't quite as simple as multiplying
// width/height, because that only changes the container size, not the
// content size.
}
};
/**
* Get the current computed width for the given element including margin,
* padding and border.
* Equivalent to jQuery's `$(el).outerWidth(true)`.
* @param {!Element} element Element.
* @return {number}
*/
ol.dom.outerWidth = function(element) {
var width = element.offsetWidth;
var style = element.currentStyle || window.getComputedStyle(element);
width += parseInt(style.marginLeft, 10) + parseInt(style.marginRight, 10);
return width;
};
/**
* Get the current computed height for the given element including margin,
* padding and border.
* Equivalent to jQuery's `$(el).outerHeight(true)`.
* @param {!Element} element Element.
* @return {number}
*/
ol.dom.outerHeight = function(element) {
var height = element.offsetHeight;
var style = element.currentStyle || window.getComputedStyle(element);
height += parseInt(style.marginTop, 10) + parseInt(style.marginBottom, 10);
return height;
};
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