143 lines
3.6 KiB
JavaScript
143 lines
3.6 KiB
JavaScript
/*
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* Navigation allows movement using the arrow keys through the search results.
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*
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* When using this library you will need to set scrollIntoView to the
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* appropriate function for your layout. Use scrollInWindow if the container
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* is not scrollable and scrollInElement if the container is a separate
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* scrolling region.
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*/
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Navigation = new function() {
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this.initNavigation = function() {
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var _this = this;
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$(document).keydown(function(e) {
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_this.onkeydown(e);
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}).keyup(function(e) {
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_this.onkeyup(e);
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});
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this.navigationActive = true;
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}
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this.setNavigationActive = function(state) {
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this.navigationActive = state;
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this.clearMoveTimeout();
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}
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this.onkeyup = function(e) {
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if (!this.navigationActive) return;
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switch(e.keyCode) {
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case 37: //Event.KEY_LEFT:
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case 38: //Event.KEY_UP:
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case 39: //Event.KEY_RIGHT:
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case 40: //Event.KEY_DOWN:
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this.clearMoveTimeout();
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break;
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}
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}
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this.onkeydown = function(e) {
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if (!this.navigationActive) return;
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switch(e.keyCode) {
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case 37: //Event.KEY_LEFT:
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if (this.moveLeft()) e.preventDefault();
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break;
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case 38: //Event.KEY_UP:
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if (e.keyCode == 38 || e.ctrlKey) {
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if (this.moveUp()) e.preventDefault();
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this.startMoveTimeout(false);
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}
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break;
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case 39: //Event.KEY_RIGHT:
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if (this.moveRight()) e.preventDefault();
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break;
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case 40: //Event.KEY_DOWN:
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if (e.keyCode == 40 || e.ctrlKey) {
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if (this.moveDown()) e.preventDefault();
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this.startMoveTimeout(true);
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}
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break;
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case 13: //Event.KEY_RETURN:
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if (this.$current)
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e.preventDefault();
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this.select(this.$current);
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break;
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}
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if (e.ctrlKey && e.shiftKey) this.select(this.$current);
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}
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this.clearMoveTimeout = function() {
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clearTimeout(this.moveTimeout);
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this.moveTimeout = null;
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}
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this.startMoveTimeout = function(isDown) {
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if (!$.browser.mozilla && !$.browser.opera) return;
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if (this.moveTimeout) this.clearMoveTimeout();
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var _this = this;
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var go = function() {
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if (!_this.moveTimeout) return;
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_this[isDown ? 'moveDown' : 'moveUp']();
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_this.moveTimout = setTimeout(go, 100);
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}
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this.moveTimeout = setTimeout(go, 200);
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}
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this.moveRight = function() {
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}
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this.moveLeft = function() {
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}
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this.move = function(isDown) {
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}
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this.moveUp = function() {
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return this.move(false);
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}
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this.moveDown = function() {
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return this.move(true);
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}
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/*
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* Scrolls to the given element in the scrollable element view.
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*/
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this.scrollInElement = function(element, view) {
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var offset, viewHeight, viewScroll, height;
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offset = element.offsetTop;
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height = element.offsetHeight;
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viewHeight = view.offsetHeight;
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viewScroll = view.scrollTop;
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if (offset - viewScroll + height > viewHeight) {
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view.scrollTop = offset - viewHeight + height;
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}
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if (offset < viewScroll) {
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view.scrollTop = offset;
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}
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}
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/*
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* Scrolls to the given element in the window. The second argument is
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* ignored
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*/
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this.scrollInWindow = function(element, ignored) {
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var offset, viewHeight, viewScroll, height;
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offset = element.offsetTop;
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height = element.offsetHeight;
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viewHeight = window.innerHeight;
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viewScroll = window.scrollY;
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if (offset - viewScroll + height > viewHeight) {
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window.scrollTo(window.scrollX, offset - viewHeight + height);
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}
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if (offset < viewScroll) {
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window.scrollTo(window.scrollX, offset);
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}
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}
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}
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