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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.dom.TagName');
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(goog.dom.TagName.CANVAS);
if (goog.isDef(opt_width)) {
canvas.width = opt_width;
}
if (goog.isDef(opt_height)) {
canvas.height = opt_height;
}
return canvas.getContext('2d');
};
/**
* @enum {boolean}
*/
ol.dom.BrowserFeature = {
USE_MS_MATRIX_TRANSFORM: ol.LEGACY_IE_SUPPORT && ol.IS_LEGACY_IE,
USE_MS_ALPHA_FILTER: ol.LEGACY_IE_SUPPORT && ol.IS_LEGACY_IE
};
/**
* 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 (!goog.isDef(canUseCssTransform)) {
goog.asserts.assert(!goog.isNull(document.body),
'document.body should not be null');
if (!goog.global.getComputedStyle) {
// this browser is ancient
canUseCssTransform = false;
} else {
var el = goog.dom.createElement(goog.dom.TagName.P),
has2d,
transforms = {
'webkitTransform': '-webkit-transform',
'OTransform': '-o-transform',
'msTransform': '-ms-transform',
'MozTransform': '-moz-transform',
'transform': 'transform'
};
goog.dom.appendChild(document.body, 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 (!goog.isDef(canUseCssTransform3D)) {
goog.asserts.assert(!goog.isNull(document.body),
'document.body should not be null');
if (!goog.global.getComputedStyle) {
// this browser is ancient
canUseCssTransform3D = false;
} else {
var el = goog.dom.createElement(goog.dom.TagName.P),
has3d,
transforms = {
'webkitTransform': '-webkit-transform',
'OTransform': '-o-transform',
'msTransform': '-ms-transform',
'MozTransform': '-moz-transform',
'transform': 'transform'
};
goog.dom.appendChild(document.body, 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 && !ol.IS_LEGACY_IE) {
element.style.transformOrigin = '0 0';
}
};
/**
* Sets the opacity of an element, in an IE-compatible way
* @param {!Element} element Element
* @param {number} value Opacity, [0..1]
*/
ol.dom.setOpacity = function(element, value) {
if (ol.dom.BrowserFeature.USE_MS_ALPHA_FILTER) {
/** @type {string} */
var filter = element.currentStyle.filter;
/** @type {RegExp} */
var regex;
/** @type {string} */
var alpha;
if (goog.userAgent.VERSION == '8.0') {
regex = /progid:DXImageTransform\.Microsoft\.Alpha\(.*?\)/i;
alpha = 'progid:DXImageTransform.Microsoft.Alpha(Opacity=' +
(value * 100) + ')';
} else {
regex = /alpha\(.*?\)/i;
alpha = 'alpha(opacity=' + (value * 100) + ')';
}
var newFilter = filter.replace(regex, alpha);
if (newFilter === filter) {
// no replace was made? just append the new alpha filter instead
newFilter += ' ' + alpha;
}
element.style.filter = newFilter;
// Fix to apply filter to absolutely-positioned children element
if (element.currentStyle.zIndex === 'auto') {
element.style.zIndex = 0;
}
} else {
element.style.opacity = value;
}
};
/**
* Sets the IE matrix transform without replacing other filters
* @private
* @param {!Element} element Element
* @param {string} value The new progid string
*/
ol.dom.setIEMatrix_ = function(element, value) {
var filter = element.currentStyle.filter;
var newFilter =
filter.replace(/progid:DXImageTransform.Microsoft.Matrix\(.*?\)/i, value);
if (newFilter === filter) {
newFilter = ' ' + value;
}
element.style.filter = newFilter;
// Fix to apply filter to absolutely-positioned children element
if (element.currentStyle.zIndex === 'auto') {
element.style.zIndex = 0;
}
};
/**
* @param {!Element} element Element.
* @param {goog.vec.Mat4.Number} transform Matrix.
* @param {number=} opt_precision Precision.
* @param {Element=} opt_translationElement Required for IE7-8
*/
ol.dom.transformElement2D =
function(element, transform, opt_precision, opt_translationElement) {
// using matrix() causes gaps in Chrome and Firefox on Mac OS X, so prefer
// matrix3d()
var i;
if (ol.dom.canUseCssTransform3D()) {
var value3D;
if (goog.isDef(opt_precision)) {
/** @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 (goog.isDef(opt_precision)) {
/** @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 if (ol.dom.BrowserFeature.USE_MS_MATRIX_TRANSFORM) {
var m11 = goog.vec.Mat4.getElement(transform, 0, 0),
m12 = goog.vec.Mat4.getElement(transform, 0, 1),
m21 = goog.vec.Mat4.getElement(transform, 1, 0),
m22 = goog.vec.Mat4.getElement(transform, 1, 1),
dx = goog.vec.Mat4.getElement(transform, 0, 3),
dy = goog.vec.Mat4.getElement(transform, 1, 3);
// See: http://msdn.microsoft.com/en-us/library/ms533014(v=vs.85).aspx
// and: http://extremelysatisfactorytotalitarianism.com/blog/?p=1002
// @TODO: fix terrible IE bbox rotation issue.
var s = 'progid:DXImageTransform.Microsoft.Matrix(';
s += 'sizingMethod="auto expand"';
s += ',M11=' + m11.toFixed(opt_precision || 20);
s += ',M12=' + m12.toFixed(opt_precision || 20);
s += ',M21=' + m21.toFixed(opt_precision || 20);
s += ',M22=' + m22.toFixed(opt_precision || 20);
s += ')';
ol.dom.setIEMatrix_(element, s);
// scale = m11 = m22 = target resolution [m/px] / current res [m/px]
// dx = (viewport width [px] / 2) * scale
// + (layer.x [m] - view.x [m]) / target resolution [m / px]
// except that we're positioning the child element relative to the
// viewport, not the map.
// dividing by the scale factor isn't the exact correction, but it's
// close enough that you can barely tell unless you're looking for it
dx /= m11;
dy /= m22;
opt_translationElement.style.left = Math.round(dx) + 'px';
opt_translationElement.style.top = Math.round(dy) + 'px';
} 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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