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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; $(document).keydown(function(e) { _this.onkeydown(e); }).keyup(function(e) { _this.onkeyup(e); }); this.navigationActive = true; } this.setNavigationActive = function(state) { this.navigationActive = state; this.clearMoveTimeout(); } this.onkeyup = function(e) { if (!this.navigationActive) return; switch(e.keyCode) { case 37: //Event.KEY_LEFT: case 38: //Event.KEY_UP: case 39: //Event.KEY_RIGHT: case 40: //Event.KEY_DOWN: this.clearMoveTimeout(); break; } } this.onkeydown = function(e) { if (!this.navigationActive) return; switch(e.keyCode) { case 37: //Event.KEY_LEFT: if (this.moveLeft()) e.preventDefault(); break; case 38: //Event.KEY_UP: if (e.keyCode == 38 \|\| e.ctrlKey) { if (this.moveUp()) e.preventDefault(); this.startMoveTimeout(false); } break; case 39: //Event.KEY_RIGHT: if (this.moveRight()) e.preventDefault(); break; case 40: //Event.KEY_DOWN: if (e.keyCode == 40 \|\| e.ctrlKey) { if (this.moveDown()) e.preventDefault(); this.startMoveTimeout(true); } break; case 13: //Event.KEY_RETURN: if (this.$current) e.preventDefault(); this.select(this.$current); break; } if (e.ctrlKey && e.shiftKey) this.select(this.$current); } this.clearMoveTimeout = function() { clearTimeout(this.moveTimeout); this.moveTimeout = null; } this.startMoveTimeout = function(isDown) { if (!$.browser.mozilla && !$.browser.opera) return; if (this.moveTimeout) this.clearMoveTimeout(); var _this = this; var go = function() { if (!_this.moveTimeout) return; _this[isDown ? 'moveDown' : 'moveUp'](); _this.moveTimout = setTimeout(go, 100); } this.moveTimeout = setTimeout(go, 200); } 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); } } }