强制OpenLayers Markers图层在顶部绘制,并在下面有可选择的图层

Question

我有一个OpenLayers地图,它有一个光栅基础层,一个矢量图层和一个标记图层.它们以正确的顺序显示,矢量顶部的标记非常好.

但是当我添加一个SelectFeature控件并将其指向矢量图层时,它会突然在标记图层上方绘制,尽管所有努力都会提升标记图层或设置Z索引.似乎SelectFeature控件会覆盖所有绘图顺序设置.这是设计,还是我能以某种方式克服这个问题？

图层定义:

var baselayer = new OpenLayers.Layer.WMS('Norden', 
'http://{myarcgisserver}/ArcGIS/services/mylayer/MapServer/WMSServer', {
    layers :'1,2',
    transparent :false,
    width :'auto',
    height :'auto',
    filter :null
}, {
    isBaseLayer: true,
    singleTile :true,
    ratio :1,
    alpha :false,
    transitionEffect :'resize'
});

var vectorLayer = new OpenLayers.Layer.Vector("Work orders", {
    projection: new OpenLayers.Projection("EPSG:2400"),
    strategies: [new OpenLayers.Strategy.Fixed(), refresh],
    protocol: new OpenLayers.Protocol.HTTP({
        url: "/WorkOrder/WorkOrders.ashx?output=geojson",
        format: new OpenLayers.Format.GeoJSON()
    })
});

var markerlayer = new OpenLayers.Layer.Markers("Markers", {
    projection: new OpenLayers.Projection("EPSG:2400"),
    displayInLayerSwitcher: false
}
);

控件定义:

var selectctrl = new OpenLayers.Control.SelectFeature(
    vectorLayer,
    {
        clickout: true,
        toggle: false,
        multiple: false,
        hover: false,
        toggleKey: "ctrlKey", // ctrl key removes from selection
        multipleKey: "shiftKey", // shift key adds to selection
        box: false
    }
);

激活:(没有这个,图层按正确的顺序绘制)

map.addControl(selectctrl);

selectctrl.activate();

编辑:在OpenLayers.Handler.Feature中找到这个,其中"moveLayerToTop"感觉就像罪魁祸首......会尝试克服它,但如果有人知道这是不可能的,请告诉我!

/**
 * Method: activate 
 * Turn on the handler.  Returns false if the handler was already active.
 *
 * Returns:
 * {Boolean}
 */
activate: function() {
    var activated = false;
    if(OpenLayers.Handler.prototype.activate.apply(this, arguments)) {
        this.moveLayerToTop();
        this.map.events.on({
            "removelayer": this.handleMapEvents,
            "changelayer": this.handleMapEvents,
            scope: this
        });
        activated = true;
    }
    return activated;
},

Answer 1

答案 - 如果可以调用它,那就在我上面提到的激活功能中.我试图覆盖它并删除了对moveLayerToTop的调用,它就像一个魅力.

编辑:我最终将此代码添加到OL代码库外的js文件中,覆盖处理程序激活功能.这是因为否则我将失去对OpenLayers代码库更新的更改.

OpenLayers.Handler.Feature.prototype.activate = function() {
    var activated = false;
    if (OpenLayers.Handler.prototype.activate.apply(this, arguments)) {
        //this.moveLayerToTop();
        this.map.events.on({
            "removelayer": this.handleMapEvents,
            "changelayer": this.handleMapEvents,
            scope: this
        });
        activated = true;
    }
    return activated;
};