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var $, ScrollHandler;
$ = jQuery;
ScrollHandler = (function() {
function ScrollHandler(tree_widget) {
this.tree_widget = tree_widget;
this.previous_top = -1;
this.is_initialized = false;
}
ScrollHandler.prototype._initScrollParent = function() {
var $scroll_parent, getParentWithOverflow, setDocumentAsScrollParent;
getParentWithOverflow = (function(_this) {
return function() {
var css_values, el, hasOverFlow, i, len, ref;
css_values = ['overflow', 'overflow-y'];
hasOverFlow = function(el) {
var css_value, i, len, ref;
for (i = 0, len = css_values.length; i < len; i++) {
css_value = css_values[i];
if ((ref = $.css(el, css_value)) === 'auto' || ref === 'scroll') {
return true;
}
}
return false;
};
if (hasOverFlow(_this.tree_widget.$el[0])) {
return _this.tree_widget.$el;
}
ref = _this.tree_widget.$el.parents();
for (i = 0, len = ref.length; i < len; i++) {
el = ref[i];
if (hasOverFlow(el)) {
return $(el);
}
}
return null;
};
})(this);
setDocumentAsScrollParent = (function(_this) {
return function() {
_this.scroll_parent_top = 0;
return _this.$scroll_parent = null;
};
})(this);
if (this.tree_widget.$el.css('position') === 'fixed') {
setDocumentAsScrollParent();
}
$scroll_parent = getParentWithOverflow();
if ($scroll_parent && $scroll_parent.length && $scroll_parent[0].tagName !== 'HTML') {
this.$scroll_parent = $scroll_parent;
this.scroll_parent_top = this.$scroll_parent.offset().top;
} else {
setDocumentAsScrollParent();
}
return this.is_initialized = true;
};
ScrollHandler.prototype._ensureInit = function() {
if (!this.is_initialized) {
return this._initScrollParent();
}
};
ScrollHandler.prototype.checkScrolling = function() {
var hovered_area;
this._ensureInit();
hovered_area = this.tree_widget.dnd_handler.hovered_area;
if (hovered_area && hovered_area.top !== this.previous_top) {
this.previous_top = hovered_area.top;
if (this.$scroll_parent) {
return this._handleScrollingWithScrollParent(hovered_area);
} else {
return this._handleScrollingWithDocument(hovered_area);
}
}
};
ScrollHandler.prototype._handleScrollingWithScrollParent = function(area) {
var distance_bottom;
distance_bottom = this.scroll_parent_top + this.$scroll_parent[0].offsetHeight - area.bottom;
if (distance_bottom < 20) {
this.$scroll_parent[0].scrollTop += 20;
this.tree_widget.refreshHitAreas();
return this.previous_top = -1;
} else if ((area.top - this.scroll_parent_top) < 20) {
this.$scroll_parent[0].scrollTop -= 20;
this.tree_widget.refreshHitAreas();
return this.previous_top = -1;
}
};
ScrollHandler.prototype._handleScrollingWithDocument = function(area) {
var distance_top;
distance_top = area.top - $(document).scrollTop();
if (distance_top < 20) {
return $(document).scrollTop($(document).scrollTop() - 20);
} else if ($(window).height() - (area.bottom - $(document).scrollTop()) < 20) {
return $(document).scrollTop($(document).scrollTop() + 20);
}
};
ScrollHandler.prototype.scrollTo = function(top) {
var tree_top;
this._ensureInit();
if (this.$scroll_parent) {
return this.$scroll_parent[0].scrollTop = top;
} else {
tree_top = this.tree_widget.$el.offset().top;
return $(document).scrollTop(top + tree_top);
}
};
ScrollHandler.prototype.isScrolledIntoView = function(element) {
var $element, element_bottom, element_top, view_bottom, view_top;
this._ensureInit();
$element = $(element);
if (this.$scroll_parent) {
view_top = 0;
view_bottom = this.$scroll_parent.height();
element_top = $element.offset().top - this.scroll_parent_top;
element_bottom = element_top + $element.height();
} else {
view_top = $(window).scrollTop();
view_bottom = view_top + $(window).height();
element_top = $element.offset().top;
element_bottom = element_top + $element.height();
}
return (element_bottom <= view_bottom) && (element_top >= view_top);
};
return ScrollHandler;
})();
module.exports = ScrollHandler;
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