d3/src/event/drag.js at master · blehman/d3

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import "../core/document";

import "../core/vendor";

import "../selection/on";

var d3_event_dragSelect = d3_vendorSymbol(d3_documentElement.style, "userSelect"),

d3_event_dragId = 0;

function d3_event_dragSuppress() {

var name = ".dragsuppress-" + ++d3_event_dragId,

touchmove = "touchmove" + name,

selectstart = "selectstart" + name,

dragstart = "dragstart" + name,

click = "click" + name,

w = d3.select(d3_window).on(touchmove, d3_eventPreventDefault).on(selectstart, d3_eventPreventDefault).on(dragstart, d3_eventPreventDefault),

style = d3_documentElement.style,

select = style[d3_event_dragSelect];

style[d3_event_dragSelect] = "none";

return function(suppressClick) {

w.on(name, null);

style[d3_event_dragSelect] = select;

if (suppressClick) { // suppress the next click, but only if it’s immediate

function off() { w.on(click, null); }

w.on(click, function() { d3_eventPreventDefault(); off(); }, true);

setTimeout(off, 0);

}

};

}