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/*
* Navigation allows movement using the arrow keys through the search results.
*
* When using this library you will need to set scrollIntoView to the
* appropriate function for your layout. Use scrollInWindow if the container
* is not scrollable and scrollInElement if the container is a separate
* scrolling region.
*/
Navigation = new function() {
this.initNavigation = function() {
var _this = this;
document.addEventListener('keydown', function(e) {
_this.onkeydown(e);
});
this.navigationActive = true;
}
this.setNavigationActive = function(state) {
this.navigationActive = state;
}
this.onkeydown = function(e) {
if (!this.navigationActive) return;
switch(e.keyCode) {
case 37: //Event.KEY_LEFT:
if (this.moveLeft()) e.preventDefault();
break;
case 38: //Event.KEY_UP:
if (e.keyCode == 38 || e.ctrlKey) {
if (this.moveUp()) e.preventDefault();
}
break;
case 39: //Event.KEY_RIGHT:
if (this.moveRight()) e.preventDefault();
break;
case 40: //Event.KEY_DOWN:
if (e.keyCode == 40 || e.ctrlKey) {
if (this.moveDown()) e.preventDefault();
}
break;
case 13: //Event.KEY_RETURN:
if (this.current) e.preventDefault();
this.select(this.current);
break;
}
if (e.ctrlKey && e.shiftKey) this.select(this.current);
}
this.moveRight = function() {
}
this.moveLeft = function() {
}
this.move = function(isDown) {
}
this.moveUp = function() {
return this.move(false);
}
this.moveDown = function() {
return this.move(true);
}
/*
* Scrolls to the given element in the scrollable element view.
*/
this.scrollInElement = function(element, view) {
var offset, viewHeight, viewScroll, height;
offset = element.offsetTop;
height = element.offsetHeight;
viewHeight = view.offsetHeight;
viewScroll = view.scrollTop;
if (offset - viewScroll + height > viewHeight) {
view.scrollTop = offset - viewHeight + height;
}
if (offset < viewScroll) {
view.scrollTop = offset;
}
}
/*
* Scrolls to the given element in the window. The second argument is
* ignored
*/
this.scrollInWindow = function(element, ignored) {
var offset, viewHeight, viewScroll, height;
offset = element.offsetTop;
height = element.offsetHeight;
viewHeight = window.innerHeight;
viewScroll = window.scrollY;
if (offset - viewScroll + height > viewHeight) {
window.scrollTo(window.scrollX, offset - viewHeight + height);
}
if (offset < viewScroll) {
window.scrollTo(window.scrollX, offset);
}
}
}
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