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Viewing file:     ClippathManager.js (4.99 KB)      -rw-r--r--

/**
 * @file Manages SVG clipPath elements.
 * @author Zhang Wenli
 */

import Definable from './Definable';
import * as zrUtil from '../../core/util';
import * as matrix from '../../core/matrix';

/**
 * Manages SVG clipPath elements.
 *
 * @class
 * @extends Definable
 * @param   {number}     zrId    zrender instance id
 * @param   {SVGElement} svgRoot root of SVG document
 */
function ClippathManager(zrId, svgRoot) {
    Definable.call(this, zrId, svgRoot, 'clipPath', '__clippath_in_use__');
}


zrUtil.inherits(ClippathManager, Definable);


/**
 * Update clipPath.
 *
 * @param {Displayable} displayable displayable element
 */
ClippathManager.prototype.update = function (displayable) {
    var svgEl = this.getSvgElement(displayable);
    if (svgEl) {
        this.updateDom(svgEl, displayable.__clipPaths, false);
    }

    var textEl = this.getTextSvgElement(displayable);
    if (textEl) {
        // Make another clipPath for text, since it's transform
        // matrix is not the same with svgElement
        this.updateDom(textEl, displayable.__clipPaths, true);
    }

    this.markUsed(displayable);
};


/**
 * Create an SVGElement of displayable and create a <clipPath> of its
 * clipPath
 *
 * @param {Displayable} parentEl  parent element
 * @param {ClipPath[]}  clipPaths clipPaths of parent element
 * @param {boolean}     isText    if parent element is Text
 */
ClippathManager.prototype.updateDom = function (
    parentEl,
    clipPaths,
    isText
) {
    if (clipPaths && clipPaths.length > 0) {
        // Has clipPath, create <clipPath> with the first clipPath
        var defs = this.getDefs(true);
        var clipPath = clipPaths[0];
        var clipPathEl;
        var id;

        var dom = isText ? '_textDom' : '_dom';

        if (clipPath[dom]) {
            // Use a dom that is already in <defs>
            id = clipPath[dom].getAttribute('id');
            clipPathEl = clipPath[dom];

            // Use a dom that is already in <defs>
            if (!defs.contains(clipPathEl)) {
                // This happens when set old clipPath that has
                // been previously removed
                defs.appendChild(clipPathEl);
            }
        }
        else {
            // New <clipPath>
            id = 'zr' + this._zrId + '-clip-' + this.nextId;
            ++this.nextId;
            clipPathEl = this.createElement('clipPath');
            clipPathEl.setAttribute('id', id);
            defs.appendChild(clipPathEl);

            clipPath[dom] = clipPathEl;
        }

        // Build path and add to <clipPath>
        var svgProxy = this.getSvgProxy(clipPath);
        if (clipPath.transform
            && clipPath.parent.invTransform
            && !isText
        ) {
            /**
             * If a clipPath has a parent with transform, the transform
             * of parent should not be considered when setting transform
             * of clipPath. So we need to transform back from parent's
             * transform, which is done by multiplying parent's inverse
             * transform.
             */
            // Store old transform
            var transform = Array.prototype.slice.call(
                clipPath.transform
            );

            // Transform back from parent, and brush path
            matrix.mul(
                clipPath.transform,
                clipPath.parent.invTransform,
                clipPath.transform
            );
            svgProxy.brush(clipPath);

            // Set back transform of clipPath
            clipPath.transform = transform;
        }
        else {
            svgProxy.brush(clipPath);
        }

        var pathEl = this.getSvgElement(clipPath);

        clipPathEl.innerHTML = '';
        /**
         * Use `cloneNode()` here to appendChild to multiple parents,
         * which may happend when Text and other shapes are using the same
         * clipPath. Since Text will create an extra clipPath DOM due to
         * different transform rules.
         */
        clipPathEl.appendChild(pathEl.cloneNode());

        parentEl.setAttribute('clip-path', 'url(#' + id + ')');

        if (clipPaths.length > 1) {
            // Make the other clipPaths recursively
            this.updateDom(clipPathEl, clipPaths.slice(1), isText);
        }
    }
    else {
        // No clipPath
        if (parentEl) {
            parentEl.setAttribute('clip-path', 'none');
        }
    }
};

/**
 * Mark a single clipPath to be used
 *
 * @param {Displayable} displayable displayable element
 */
ClippathManager.prototype.markUsed = function (displayable) {
    var that = this;
    // displayable.__clipPaths can only be `null`/`undefined` or an non-empty array.
    if (displayable.__clipPaths) {
        zrUtil.each(displayable.__clipPaths, function (clipPath) {
            if (clipPath._dom) {
                Definable.prototype.markUsed.call(that, clipPath._dom);
            }
            if (clipPath._textDom) {
                Definable.prototype.markUsed.call(that, clipPath._textDom);
            }
        });
    }
};


export default ClippathManager;