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Position drag element relative to mousedown on original draggable #36

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Position drag element relative to mousedown on original draggable #36

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19 changes: 13 additions & 6 deletions lib/knockout.dragdrop.js
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Original file line number Diff line number Diff line change
Expand Up @@ -178,19 +178,20 @@
this.dirty = false;
};

function DragElement(element) {
function DragElement(element, eventOffset) {
this.element = element;
toggleClass(this.element, 'drag-element', true);
this.element.style.position = 'fixed';
this.element.style.zIndex = 9998;
this.element.addEventListener('selectstart', function () { return false; }, true);
this.eventOffset = eventOffset || { top: 0, left: 0 };
}

DragElement.prototype.updatePosition = function (event) {
this.element.style.top = (event.pageY - window.pageYOffset) + 'px';
this.element.style.left = (event.pageX - window.pageXOffset) + 'px';
this.element.style.top = (getEventCoord(event, 'pageY') - window.pageYOffset) + 'px';
this.element.style.left = (getEventCoord(event, 'pageX') - window.pageXOffset) + 'px';
this.element.style.top = (event.pageY - window.pageYOffset - this.eventOffset.top) + 'px';
this.element.style.left = (event.pageX - window.pageXOffset - this.eventOffset.left) + 'px';
this.element.style.top = (getEventCoord(event, 'pageY') - window.pageYOffset - this.eventOffset.top) + 'px';
this.element.style.left = (getEventCoord(event, 'pageX') - window.pageXOffset - this.eventOffset.left) + 'px';
};

DragElement.prototype.remove = function () {
Expand Down Expand Up @@ -535,7 +536,13 @@

var dragElement = null;
if (typeof options.element === 'undefined') {
dragElement = new DragElement(createCloneProxyElement());
var bodyRect = document.body.getBoundingClientRect();
var elemRect = element.getBoundingClientRect();
var eventOffset = {
top: startEvent.pageY - elemRect.top + bodyRect.top,
left: startEvent.pageX - elemRect.left + bodyRect.left,
};
dragElement = new DragElement(createCloneProxyElement(), eventOffset);
}

var overlay = document.createElement('div');
Expand Down