Draggable.prototype.updateLimits = function () {
var that = this;
//initial translation offsets
var initXY = that.getCoords();
//calc initial coords
that.prevX = initXY[0];
that.prevY = initXY[1];
that.initX = initXY[0];
that.initY = initXY[1];
//container rect might be outside the vp, so calc absolute offsets
//zero-position offsets, with translation(0,0)
var thatOffsets = offsets(that.element);
that.initOffsetX = thatOffsets.left - that.prevX;
that.initOffsetY = thatOffsets.top - that.prevY;
that.offsets = thatOffsets;
//handle parent case
var within = that.within;
if (that.within === 'parent' || that.within === true) {
within = that.element.parentNode;
}
within = within || doc;
//absolute offsets of a container
var withinOffsets = offsets(within);
if (within === win && that._isFixed) {
withinOffsets.top -= win.pageYOffset;
withinOffsets.left -= win.pageXOffset;
withinOffsets.bottom -= win.pageYOffset;
withinOffsets.right -= win.pageXOffset;
}
that.withinOffsets = withinOffsets;
//calculate movement limits - pin width might be wider than constraints
that.overflowX = that.pin.width - withinOffsets.width;
that.overflowY = that.pin.height - withinOffsets.height;
that.limits = {
left: withinOffsets.left - that.initOffsetX - that.pin[0] - (that.overflowX < 0 ? 0 : that.overflowX),
top: withinOffsets.top - that.initOffsetY - that.pin[1] - (that.overflowY < 0 ? 0 : that.overflowY),
right: that.overflowX > 0 ? 0 : withinOffsets.right - that.initOffsetX - that.pin[2],
bottom: (that.overflowY > 0 ? 0 : withinOffsets.bottom - that.initOffsetY - that.pin[3])
};
};
that.dropTargets.forEach(function (dropTarget) {
var targetRect = offsets(dropTarget);
if (intersect(thatRect, targetRect, that.droppableTolerance)) {
if (that.droppableClass) {
dropTarget.classList.add(that.droppableClass);
}
if (!that.dropTarget) {
that.dropTarget = dropTarget;
emit(that, 'dragover', dropTarget);
emit(dropTarget, 'dragover', that);
}
}
else {
if (that.dropTarget) {
emit(that, 'dragout', dropTarget);
emit(dropTarget, 'dragout', that);
that.dropTarget = null;
}
if (that.droppableClass) {
dropTarget.classList.remove(that.droppableClass);
}
}
});