|
| 1 | +/* |
| 2 | + * Navigation allows movement using the arrow keys through the search results. |
| 3 | + * |
| 4 | + * When using this library you will need to set scrollIntoView to the |
| 5 | + * appropriate function for your layout. Use scrollInWindow if the container |
| 6 | + * is not scrollable and scrollInElement if the container is a separate |
| 7 | + * scrolling region. |
| 8 | + */ |
| 9 | +Navigation = new function() { |
| 10 | + this.initNavigation = function() { |
| 11 | + var _this = this; |
| 12 | + |
| 13 | + $(document).keydown(function(e) { |
| 14 | + _this.onkeydown(e); |
| 15 | + }).keyup(function(e) { |
| 16 | + _this.onkeyup(e); |
| 17 | + }); |
| 18 | + |
| 19 | + this.navigationActive = true; |
| 20 | + } |
| 21 | + |
| 22 | + this.setNavigationActive = function(state) { |
| 23 | + this.navigationActive = state; |
| 24 | + this.clearMoveTimeout(); |
| 25 | + } |
| 26 | + |
| 27 | + this.onkeyup = function(e) { |
| 28 | + if (!this.navigationActive) return; |
| 29 | + |
| 30 | + switch(e.keyCode) { |
| 31 | + case 37: //Event.KEY_LEFT: |
| 32 | + case 38: //Event.KEY_UP: |
| 33 | + case 39: //Event.KEY_RIGHT: |
| 34 | + case 40: //Event.KEY_DOWN: |
| 35 | + this.clearMoveTimeout(); |
| 36 | + break; |
| 37 | + } |
| 38 | + } |
| 39 | + |
| 40 | + this.onkeydown = function(e) { |
| 41 | + if (!this.navigationActive) return; |
| 42 | + switch(e.keyCode) { |
| 43 | + case 37: //Event.KEY_LEFT: |
| 44 | + if (this.moveLeft()) e.preventDefault(); |
| 45 | + break; |
| 46 | + case 38: //Event.KEY_UP: |
| 47 | + if (e.keyCode == 38 || e.ctrlKey) { |
| 48 | + if (this.moveUp()) e.preventDefault(); |
| 49 | + this.startMoveTimeout(false); |
| 50 | + } |
| 51 | + break; |
| 52 | + case 39: //Event.KEY_RIGHT: |
| 53 | + if (this.moveRight()) e.preventDefault(); |
| 54 | + break; |
| 55 | + case 40: //Event.KEY_DOWN: |
| 56 | + if (e.keyCode == 40 || e.ctrlKey) { |
| 57 | + if (this.moveDown()) e.preventDefault(); |
| 58 | + this.startMoveTimeout(true); |
| 59 | + } |
| 60 | + break; |
| 61 | + case 13: //Event.KEY_RETURN: |
| 62 | + if (this.$current) |
| 63 | + e.preventDefault(); |
| 64 | + this.select(this.$current); |
| 65 | + break; |
| 66 | + } |
| 67 | + if (e.ctrlKey && e.shiftKey) this.select(this.$current); |
| 68 | + } |
| 69 | + |
| 70 | + this.clearMoveTimeout = function() { |
| 71 | + clearTimeout(this.moveTimeout); |
| 72 | + this.moveTimeout = null; |
| 73 | + } |
| 74 | + |
| 75 | + this.startMoveTimeout = function(isDown) { |
| 76 | + if (!$.browser.mozilla && !$.browser.opera) return; |
| 77 | + if (this.moveTimeout) this.clearMoveTimeout(); |
| 78 | + var _this = this; |
| 79 | + |
| 80 | + var go = function() { |
| 81 | + if (!_this.moveTimeout) return; |
| 82 | + _this[isDown ? 'moveDown' : 'moveUp'](); |
| 83 | + _this.moveTimout = setTimeout(go, 100); |
| 84 | + } |
| 85 | + this.moveTimeout = setTimeout(go, 200); |
| 86 | + } |
| 87 | + |
| 88 | + this.moveRight = function() { |
| 89 | + } |
| 90 | + |
| 91 | + this.moveLeft = function() { |
| 92 | + } |
| 93 | + |
| 94 | + this.move = function(isDown) { |
| 95 | + } |
| 96 | + |
| 97 | + this.moveUp = function() { |
| 98 | + return this.move(false); |
| 99 | + } |
| 100 | + |
| 101 | + this.moveDown = function() { |
| 102 | + return this.move(true); |
| 103 | + } |
| 104 | + |
| 105 | + /* |
| 106 | + * Scrolls to the given element in the scrollable element view. |
| 107 | + */ |
| 108 | + this.scrollInElement = function(element, view) { |
| 109 | + var offset, viewHeight, viewScroll, height; |
| 110 | + offset = element.offsetTop; |
| 111 | + height = element.offsetHeight; |
| 112 | + viewHeight = view.offsetHeight; |
| 113 | + viewScroll = view.scrollTop; |
| 114 | + |
| 115 | + if (offset - viewScroll + height > viewHeight) { |
| 116 | + view.scrollTop = offset - viewHeight + height; |
| 117 | + } |
| 118 | + if (offset < viewScroll) { |
| 119 | + view.scrollTop = offset; |
| 120 | + } |
| 121 | + } |
| 122 | + |
| 123 | + /* |
| 124 | + * Scrolls to the given element in the window. The second argument is |
| 125 | + * ignored |
| 126 | + */ |
| 127 | + this.scrollInWindow = function(element, ignored) { |
| 128 | + var offset, viewHeight, viewScroll, height; |
| 129 | + offset = element.offsetTop; |
| 130 | + height = element.offsetHeight; |
| 131 | + viewHeight = window.innerHeight; |
| 132 | + viewScroll = window.scrollY; |
| 133 | + |
| 134 | + if (offset - viewScroll + height > viewHeight) { |
| 135 | + window.scrollTo(window.scrollX, offset - viewHeight + height); |
| 136 | + } |
| 137 | + if (offset < viewScroll) { |
| 138 | + window.scrollTo(window.scrollX, offset); |
| 139 | + } |
| 140 | + } |
| 141 | +} |
| 142 | + |
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