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/*
* jQuery UI Menu @VERSION
*
* Copyright (c) 2010 AUTHORS.txt (http://jqueryui.com/about)
* Dual licensed under the MIT (MIT-LICENSE.txt)
* and GPL (GPL-LICENSE.txt) licenses.
*
* http://docs.jquery.com/UI/Menu
*
* Depends:
* jquery.ui.core.js
* jquery.ui.widget.js
*/
(function($) {
$.widget("ui.menu", {
_create: function() {
var self = this;
this.element
.addClass("ui-menu ui-widget ui-widget-content ui-corner-all")
.attr({
role: "listbox",
"aria-activedescendant": "ui-active-menuitem"
})
.click(function( event ) {
if ( !$( event.target ).closest( ".ui-menu-item a" ).length ) {
return;
}
// temporary
event.preventDefault();
self.select( event );
});
this.refresh();
if (!this.options.input) {
this.options.input = this.element.attr("tabindex", 0);
}
this.options.input.bind("keydown.menu", function(event) {
switch (event.keyCode) {
case $.ui.keyCode.PAGE_UP:
self.previousPage();
event.preventDefault();
event.stopImmediatePropagation();
break;
case $.ui.keyCode.PAGE_DOWN:
self.nextPage();
event.preventDefault();
event.stopImmediatePropagation();
break;
case $.ui.keyCode.UP:
self.previous();
event.preventDefault();
event.stopImmediatePropagation();
break;
case $.ui.keyCode.DOWN:
self.next();
event.preventDefault();
event.stopImmediatePropagation();
break;
case $.ui.keyCode.ENTER:
self.select();
event.preventDefault();
event.stopImmediatePropagation();
break;
}
});
},
destroy: function() {
// TODO implement destroy
$.Widget.prototype.apply(this, arguments);
},
refresh: function() {
var self = this;
// don't refresh list items that are already adapted
var items = this.element.children("li:not(.ui-menu-item):has(a)")
.addClass("ui-menu-item")
.attr("role", "menuitem");
items.children("a")
.addClass("ui-corner-all")
.attr("tabindex", -1)
// mouseenter doesn't work with event delegation
.mouseenter(function( event ) {
self.activate( event, $(this).parent() );
})
.mouseleave(function() {
self.deactivate();
});
},
activate: function( event, item ) {
this.deactivate();
if (this.hasScroll()) {
var offset = item.offset().top - this.element.offset().top,
scroll = this.element.attr("scrollTop"),
elementHeight = this.element.height();
if (offset < 0) {
this.element.attr("scrollTop", scroll + offset);
} else if (offset > elementHeight) {
this.element.attr("scrollTop", scroll + offset - elementHeight + item.height());
}
}
this.active = item.eq(0)
.children("a")
.addClass("ui-state-hover")
.attr("id", "ui-active-menuitem")
.end();
this._trigger("focus", event, { item: item });
},
deactivate: function() {
if (!this.active) { return; }
this.active.children("a")
.removeClass("ui-state-hover")
.removeAttr("id");
this._trigger("blur");
this.active = null;
},
next: function(event) {
this.move("next", ".ui-menu-item:first", event);
},
previous: function(event) {
this.move("prev", ".ui-menu-item:last", event);
},
first: function() {
return this.active && !this.active.prev().length;
},
last: function() {
return this.active && !this.active.next().length;
},
move: function(direction, edge, event) {
if (!this.active) {
this.activate(event, this.element.children(edge));
return;
}
var next = this.active[direction + "All"](".ui-menu-item").eq(0);
if (next.length) {
this.activate(event, next);
} else {
this.activate(event, this.element.children(edge));
}
},
// TODO merge with previousPage
nextPage: function(event) {
if (this.hasScroll()) {
// TODO merge with no-scroll-else
if (!this.active || this.last()) {
this.activate(event, this.element.children(":first"));
return;
}
var base = this.active.offset().top,
height = this.element.height(),
result = this.element.children("li").filter(function() {
var close = $(this).offset().top - base - height + $(this).height();
// TODO improve approximation
return close < 10 && close > -10;
});
// TODO try to catch this earlier when scrollTop indicates the last page anyway
if (!result.length) {
result = this.element.children(":last");
}
this.activate(event, result);
} else {
this.activate(event, this.element.children(!this.active || this.last() ? ":first" : ":last"));
}
},
// TODO merge with nextPage
previousPage: function(event) {
if (this.hasScroll()) {
// TODO merge with no-scroll-else
if (!this.active || this.first()) {
this.activate(event, this.element.children(":last"));
return;
}
var base = this.active.offset().top,
height = this.element.height();
result = this.element.children("li").filter(function() {
var close = $(this).offset().top - base + height - $(this).height();
// TODO improve approximation
return close < 10 && close > -10;
});
// TODO try to catch this earlier when scrollTop indicates the last page anyway
if (!result.length) {
result = this.element.children(":first");
}
this.activate(event, result);
} else {
this.activate(event, this.element.children(!this.active || this.first() ? ":last" : ":first"));
}
},
hasScroll: function() {
return this.element.height() < this.element.attr("scrollHeight");
},
select: function( event ) {
this._trigger("select", event, { item: this.active });
}
});
}(jQuery));
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