aaac7fed
 liuqimichale
add
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var Definable = require("./Definable");
var zrUtil = require("../../core/util");
/**
* @file Manages SVG shadow elements.
* @author Zhang Wenli
*/
/**
* Manages SVG shadow elements.
*
* @class
* @extends Definable
* @param {number} zrId zrender instance id
* @param {SVGElement} svgRoot root of SVG document
*/
function ShadowManager(zrId, svgRoot) {
Definable.call(this, zrId, svgRoot, ['filter'], '__filter_in_use__', '_shadowDom');
}
zrUtil.inherits(ShadowManager, Definable);
/**
* Create new shadow DOM for fill or stroke if not exist,
* but will not update shadow if exists.
*
* @param {SvgElement} svgElement SVG element to paint
* @param {Displayable} displayable zrender displayable element
*/
ShadowManager.prototype.addWithoutUpdate = function (svgElement, displayable) {
if (displayable && hasShadow(displayable.style)) {
var style = displayable.style; // Create dom in <defs> if not exists
var dom;
if (style._shadowDom) {
// Gradient exists
dom = style._shadowDom;
var defs = this.getDefs(true);
if (!defs.contains(style._shadowDom)) {
// _shadowDom is no longer in defs, recreate
this.addDom(dom);
}
} else {
// New dom
dom = this.add(displayable);
}
this.markUsed(displayable);
var id = dom.getAttribute('id');
svgElement.style.filter = 'url(#' + id + ')';
}
};
/**
* Add a new shadow tag in <defs>
*
* @param {Displayable} displayable zrender displayable element
* @return {SVGFilterElement} created DOM
*/
ShadowManager.prototype.add = function (displayable) {
var dom = this.createElement('filter');
var style = displayable.style; // Set dom id with shadow id, since each shadow instance
// will have no more than one dom element.
// id may exists before for those dirty elements, in which case
// id should remain the same, and other attributes should be
// updated.
style._shadowDomId = style._shadowDomId || this.nextId++;
dom.setAttribute('id', 'zr' + this._zrId + '-shadow-' + style._shadowDomId);
this.updateDom(displayable, dom);
this.addDom(dom);
return dom;
};
/**
* Update shadow.
*
* @param {Displayable} displayable zrender displayable element
*/
ShadowManager.prototype.update = function (svgElement, displayable) {
var style = displayable.style;
if (hasShadow(style)) {
var that = this;
Definable.prototype.update.call(this, displayable, function (style) {
that.updateDom(displayable, style._shadowDom);
});
} else {
// Remove shadow
this.remove(svgElement, style);
}
};
/**
* Remove DOM and clear parent filter
*/
ShadowManager.prototype.remove = function (svgElement, style) {
if (style._shadowDomId != null) {
this.removeDom(style);
svgElement.style.filter = '';
}
};
/**
* Update shadow dom
*
* @param {Displayable} displayable zrender displayable element
* @param {SVGFilterElement} dom DOM to update
*/
ShadowManager.prototype.updateDom = function (displayable, dom) {
var domChild = dom.getElementsByTagName('feDropShadow');
if (domChild.length === 0) {
domChild = this.createElement('feDropShadow');
} else {
domChild = domChild[0];
}
var style = displayable.style;
var scaleX = displayable.scale ? displayable.scale[0] || 1 : 1;
var scaleY = displayable.scale ? displayable.scale[1] || 1 : 1; // TODO: textBoxShadowBlur is not supported yet
var offsetX, offsetY, blur, color;
if (style.shadowBlur || style.shadowOffsetX || style.shadowOffsetY) {
offsetX = style.shadowOffsetX || 0;
offsetY = style.shadowOffsetY || 0;
blur = style.shadowBlur;
color = style.shadowColor;
} else if (style.textShadowBlur) {
offsetX = style.textShadowOffsetX || 0;
offsetY = style.textShadowOffsetY || 0;
blur = style.textShadowBlur;
color = style.textShadowColor;
} else {
// Remove shadow
this.removeDom(dom, style);
return;
}
domChild.setAttribute('dx', offsetX / scaleX);
domChild.setAttribute('dy', offsetY / scaleY);
domChild.setAttribute('flood-color', color); // Divide by two here so that it looks the same as in canvas
// See: https://html.spec.whatwg.org/multipage/canvas.html#dom-context-2d-shadowblur
var stdDx = blur / 2 / scaleX;
var stdDy = blur / 2 / scaleY;
var stdDeviation = stdDx + ' ' + stdDy;
domChild.setAttribute('stdDeviation', stdDeviation); // Fix filter clipping problem
dom.setAttribute('x', '-100%');
dom.setAttribute('y', '-100%');
dom.setAttribute('width', Math.ceil(blur / 2 * 200) + '%');
dom.setAttribute('height', Math.ceil(blur / 2 * 200) + '%');
dom.appendChild(domChild); // Store dom element in shadow, to avoid creating multiple
// dom instances for the same shadow element
style._shadowDom = dom;
};
/**
* Mark a single shadow to be used
*
* @param {Displayable} displayable displayable element
*/
ShadowManager.prototype.markUsed = function (displayable) {
var style = displayable.style;
if (style && style._shadowDom) {
Definable.prototype.markUsed.call(this, style._shadowDom);
}
};
function hasShadow(style) {
// TODO: textBoxShadowBlur is not supported yet
return style && (style.shadowBlur || style.shadowOffsetX || style.shadowOffsetY || style.textShadowBlur || style.textShadowOffsetX || style.textShadowOffsetY);
}
var _default = ShadowManager;
module.exports = _default;
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