重写Leaflet事件 [英] Rewrite Leaflet event

问题描述

我尝试像这样重写boxzoom事件

I try to rewrite the boxzoom event, like this,

map.on('boxzoomend', function(e) {
    console.log('end')
})

但是，boxzoom仍在缩放，我不知道如何停止它，而只是在控制台中打印文本.我希望将boxzoom重写为以下内容

However, the boxzoom still zoomed and I have no idea how to stop it and just print text in console. I hope to rewrite boxzoom as the following

1. 停止缩放
2. 在控制台中打印文本

您能提供重写事件的正确方法吗?谢谢.

Can you provide correct way to rewrite the event? Thank you.

推荐答案

缩放不是在boxzoomend事件中执行，而是在BoxZoom处理程序中执行.让我引用传单源代码来自src/map/handler/Map.BoxZoom.js :

The zooming is not performed in the boxzoomend event, but rather in the BoxZoom handler. Let me quote the Leaflet source code from src/map/handler/Map.BoxZoom.js:

_onMouseUp: function (e) {

    ...

    this._map
        .fitBounds(bounds)
        .fire('boxzoomend', {boxZoomBounds: bounds});
},

实现所需功能的更好方法是创建一个扩展BoxZoom处理程序的新处理程序，修改所需的方法.

A better way to achieve the functionality you want is to create a new handler that extends the BoxZoom handler, modifying the methods that you need.

我建议您阅读传单教程，尤其是

I recommend that you read the Leaflet tutorials, specially the ones on creating Leaflet plugins before doing this.

想法是扩展BoxZoom处理程序:

The idea is to extend the BoxZoom handler:

L.Map.BoxPrinter = L.Map.BoxZoom.extend({

...修改_onMouseUp方法...

...modifying the _onMouseUp method...

    _onMouseUp: function (e) {

...因此它不会缩放，而只是打印内容:

...so that instead of zooming, it just prints things:

        ...
        console.log(bounds);
        this._map.fire('boxzoomend', {boxZoomBounds: bounds});
   }
}

并且如本教程所述，钩住处理程序并为其提供一些映射选项:

And as the tutorial explains, hook the handler and provide some map options for it:

L.Map.mergeOptions({boxPrinter: true});
L.Map.addInitHook('addHandler', 'boxPrinter', L.Map.BoxPrinter);

在使用此功能时，默认情况下，为所有地图实例禁用默认的BoxZoom处理程序:

While we're at it, disable the default BoxZoom handler for all map instances by default:

L.Map.mergeOptions({boxZoom: false});

在此工作示例中

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