extension-src/bmap/BMapView.ts

/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements.  See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership.  The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License.  You may obtain a copy of the License at
*
*   http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied.  See the License for the
* specific language governing permissions and limitations
* under the License.
*/

import { extendComponentView, util as zrUtil } from 'echarts';
import { BMapModel, COMPONENT_MAIN_TYPE_BMAP } from './BMapModel';
import { bmapLib, ECExtensionAPI, ECGlobalModel } from './BMapCoordSys';


function isEmptyObject(obj: object) {
    for (const key in obj) {
        if (obj.hasOwnProperty(key)) {
            return false;
        }
    }
    return true;
}

const proto = {

    type: COMPONENT_MAIN_TYPE_BMAP,

    _oldMoveHandler: undefined as bmapLib.Callback,
    _oldZoomEndHandler: undefined as bmapLib.Callback,

    render: function (bMapModel: BMapModel, ecModel: ECGlobalModel, api: ECExtensionAPI): void {
        let rendering = true;

        const bmap = bMapModel.getBMap();
        const viewportRoot = api.getZr().painter.getViewportRoot();
        const coordSys = bMapModel.coordinateSystem;
        const moveHandler = function () {
            if (rendering) {
                return;
            }
            const offsetEl = viewportRoot.parentNode.parentNode.parentNode as HTMLElement;
            const mapOffset = [
                -parseInt(offsetEl.style.left, 10) || 0,
                -parseInt(offsetEl.style.top, 10) || 0
            ];
            // only update style when map offset changed
            const viewportRootStyle = viewportRoot.style;
            const offsetLeft = mapOffset[0] + 'px';
            const offsetTop = mapOffset[1] + 'px';
            if (viewportRootStyle.left !== offsetLeft) {
                viewportRootStyle.left = offsetLeft;
            }
            if (viewportRootStyle.top !== offsetTop) {
                viewportRootStyle.top = offsetTop;
            }

            coordSys.setMapOffset(mapOffset);
            bMapModel.__mapOffset = mapOffset;

            api.dispatchAction({
                type: 'bmapRoam',
                animation: {
                    duration: 0
                }
            });
        };

        function zoomEndHandler() {
            if (rendering) {
                return;
            }
            api.dispatchAction({
                type: 'bmapRoam',
                animation: {
                    duration: 0
                }
            });
        }

        bmap.removeEventListener('moving', this._oldMoveHandler);
        bmap.removeEventListener('moveend', this._oldMoveHandler);
        bmap.removeEventListener('zoomend', this._oldZoomEndHandler);
        bmap.addEventListener('moving', moveHandler);
        bmap.addEventListener('moveend', moveHandler);
        bmap.addEventListener('zoomend', zoomEndHandler);

        this._oldMoveHandler = moveHandler;
        this._oldZoomEndHandler = zoomEndHandler;

        const roam = bMapModel.get('roam');
        if (roam && roam !== 'scale') {
            bmap.enableDragging();
        }
        else {
            bmap.disableDragging();
        }
        if (roam && roam !== 'move') {
            bmap.enableScrollWheelZoom();
            bmap.enableDoubleClickZoom();
            bmap.enablePinchToZoom();
        }
        else {
            bmap.disableScrollWheelZoom();
            bmap.disableDoubleClickZoom();
            bmap.disablePinchToZoom();
        }

        /* map 2.0 */
        const originalStyle = bMapModel.__mapStyle;

        const newMapStyle = bMapModel.get('mapStyle') || {};
        // FIXME, Not use JSON methods
        const mapStyleStr = JSON.stringify(newMapStyle);
        if (JSON.stringify(originalStyle) !== mapStyleStr) {
            // FIXME May have blank tile when dragging if setMapStyle
            if (!isEmptyObject(newMapStyle)) {
                bmap.setMapStyle(zrUtil.clone(newMapStyle));
            }
            bMapModel.__mapStyle = JSON.parse(mapStyleStr);
        }

        /* map 3.0 */
        const originalStyle2 = bMapModel.__mapStyle2;

        const newMapStyle2 = bMapModel.get('mapStyleV2') || {};
        // FIXME, Not use JSON methods
        const mapStyleStr2 = JSON.stringify(newMapStyle2);
        if (JSON.stringify(originalStyle2) !== mapStyleStr2) {
            // FIXME May have blank tile when dragging if setMapStyle
            if (!isEmptyObject(newMapStyle2)) {
                bmap.setMapStyleV2(zrUtil.clone(newMapStyle2));
            }
            bMapModel.__mapStyle2 = JSON.parse(mapStyleStr2);
        }

        rendering = false;
    }
};

extendComponentView(proto);