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Viewing file:     Painter.js (5 KB)      -rw-r--r--

/**
 * VML Painter.
 *
 * @module zrender/vml/Painter
 */

import logError from '../core/log';
import * as vmlCore from './core';
import {each} from '../core/util';

function parseInt10(val) {
    return parseInt(val, 10);
}

/**
 * @alias module:zrender/vml/Painter
 */
function VMLPainter(root, storage) {

    vmlCore.initVML();

    this.root = root;

    this.storage = storage;

    var vmlViewport = document.createElement('div');

    var vmlRoot = document.createElement('div');

    vmlViewport.style.cssText = 'display:inline-block;overflow:hidden;position:relative;width:300px;height:150px;';

    vmlRoot.style.cssText = 'position:absolute;left:0;top:0;';

    root.appendChild(vmlViewport);

    this._vmlRoot = vmlRoot;
    this._vmlViewport = vmlViewport;

    this.resize();

    // Modify storage
    var oldDelFromStorage = storage.delFromStorage;
    var oldAddToStorage = storage.addToStorage;
    storage.delFromStorage = function (el) {
        oldDelFromStorage.call(storage, el);

        if (el) {
            el.onRemove && el.onRemove(vmlRoot);
        }
    };

    storage.addToStorage = function (el) {
        // Displayable already has a vml node
        el.onAdd && el.onAdd(vmlRoot);

        oldAddToStorage.call(storage, el);
    };

    this._firstPaint = true;
}

VMLPainter.prototype = {

    constructor: VMLPainter,

    getType: function () {
        return 'vml';
    },

    /**
     * @return {HTMLDivElement}
     */
    getViewportRoot: function () {
        return this._vmlViewport;
    },

    getViewportRootOffset: function () {
        var viewportRoot = this.getViewportRoot();
        if (viewportRoot) {
            return {
                offsetLeft: viewportRoot.offsetLeft || 0,
                offsetTop: viewportRoot.offsetTop || 0
            };
        }
    },

    /**
     * 刷新
     */
    refresh: function () {

        var list = this.storage.getDisplayList(true, true);

        this._paintList(list);
    },

    _paintList: function (list) {
        var vmlRoot = this._vmlRoot;
        for (var i = 0; i < list.length; i++) {
            var el = list[i];
            if (el.invisible || el.ignore) {
                if (!el.__alreadyNotVisible) {
                    el.onRemove(vmlRoot);
                }
                // Set as already invisible
                el.__alreadyNotVisible = true;
            }
            else {
                if (el.__alreadyNotVisible) {
                    el.onAdd(vmlRoot);
                }
                el.__alreadyNotVisible = false;
                if (el.__dirty) {
                    el.beforeBrush && el.beforeBrush();
                    (el.brushVML || el.brush).call(el, vmlRoot);
                    el.afterBrush && el.afterBrush();
                }
            }
            el.__dirty = false;
        }

        if (this._firstPaint) {
            // Detached from document at first time
            // to avoid page refreshing too many times

            // FIXME 如果每次都先 removeChild 可能会导致一些填充和描边的效果改变
            this._vmlViewport.appendChild(vmlRoot);
            this._firstPaint = false;
        }
    },

    resize: function (width, height) {
        var width = width == null ? this._getWidth() : width;
        var height = height == null ? this._getHeight() : height;

        if (this._width !== width || this._height !== height) {
            this._width = width;
            this._height = height;

            var vmlViewportStyle = this._vmlViewport.style;
            vmlViewportStyle.width = width + 'px';
            vmlViewportStyle.height = height + 'px';
        }
    },

    dispose: function () {
        this.root.innerHTML = '';

        this._vmlRoot =
        this._vmlViewport =
        this.storage = null;
    },

    getWidth: function () {
        return this._width;
    },

    getHeight: function () {
        return this._height;
    },

    clear: function () {
        if (this._vmlViewport) {
            this.root.removeChild(this._vmlViewport);
        }
    },

    _getWidth: function () {
        var root = this.root;
        var stl = root.currentStyle;

        return ((root.clientWidth || parseInt10(stl.width))
                - parseInt10(stl.paddingLeft)
                - parseInt10(stl.paddingRight)) | 0;
    },

    _getHeight: function () {
        var root = this.root;
        var stl = root.currentStyle;

        return ((root.clientHeight || parseInt10(stl.height))
                - parseInt10(stl.paddingTop)
                - parseInt10(stl.paddingBottom)) | 0;
    }
};

// Not supported methods
function createMethodNotSupport(method) {
    return function () {
        logError('In IE8.0 VML mode painter not support method "' + method + '"');
    };
}

// Unsupported methods
each([
    'getLayer', 'insertLayer', 'eachLayer', 'eachBuiltinLayer', 'eachOtherLayer', 'getLayers',
    'modLayer', 'delLayer', 'clearLayer', 'toDataURL', 'pathToImage'
], function (name) {
    VMLPainter.prototype[name] = createMethodNotSupport(name);
});

export default VMLPainter;