重写传单事件
我尝试重写boxzoom事件，像这样，
I try to rewrite the boxzoom event, like this,
map.on('boxzoomend', function(e) {
console.log('end')
})
但是，boxzoom 仍然缩放，我不知道如何停止它，只是在控制台中打印文本.我希望将boxzoom重写为如下
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
- 停止缩放
- 在控制台中打印文本
你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 Leaflet 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，修改您需要的方法.
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 在此之前创建 Leaflet 插件.
I recommend that you read the Leaflet tutorials, specially the ones on creating Leaflet plugins before doing this.
这个想法是扩展 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) {
...所以它不是缩放，而是打印东西:
...so that instead of zooming, it just prints things:
...
console.log(bounds);
this._map.fire('boxzoomend', {boxZoomBounds: bounds});
}
}
正如教程所解释的，挂钩处理程序并为其提供一些地图选项:
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);
当我们这样做时，默认禁用所有地图实例的默认 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});
整个事情看起来像 这个工作示例.
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