| 1 | define(["../main", "../window"], function(dojo) { |
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| 2 | // module: |
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| 3 | // dojo/dnd/autoscroll |
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| 4 | // summary: |
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| 5 | // TODOC |
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| 6 | |
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| 7 | dojo.getObject("dnd", true, dojo); |
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| 8 | |
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| 9 | dojo.dnd.getViewport = dojo.window.getBox; |
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| 10 | |
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| 11 | dojo.dnd.V_TRIGGER_AUTOSCROLL = 32; |
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| 12 | dojo.dnd.H_TRIGGER_AUTOSCROLL = 32; |
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| 13 | |
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| 14 | dojo.dnd.V_AUTOSCROLL_VALUE = 16; |
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| 15 | dojo.dnd.H_AUTOSCROLL_VALUE = 16; |
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| 16 | |
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| 17 | dojo.dnd.autoScroll = function(e){ |
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| 18 | // summary: |
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| 19 | // a handler for onmousemove event, which scrolls the window, if |
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| 20 | // necesary |
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| 21 | // e: Event |
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| 22 | // onmousemove event |
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| 23 | |
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| 24 | // FIXME: needs more docs! |
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| 25 | var v = dojo.window.getBox(), dx = 0, dy = 0; |
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| 26 | if(e.clientX < dojo.dnd.H_TRIGGER_AUTOSCROLL){ |
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| 27 | dx = -dojo.dnd.H_AUTOSCROLL_VALUE; |
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| 28 | }else if(e.clientX > v.w - dojo.dnd.H_TRIGGER_AUTOSCROLL){ |
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| 29 | dx = dojo.dnd.H_AUTOSCROLL_VALUE; |
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| 30 | } |
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| 31 | if(e.clientY < dojo.dnd.V_TRIGGER_AUTOSCROLL){ |
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| 32 | dy = -dojo.dnd.V_AUTOSCROLL_VALUE; |
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| 33 | }else if(e.clientY > v.h - dojo.dnd.V_TRIGGER_AUTOSCROLL){ |
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| 34 | dy = dojo.dnd.V_AUTOSCROLL_VALUE; |
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| 35 | } |
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| 36 | window.scrollBy(dx, dy); |
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| 37 | }; |
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| 38 | |
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| 39 | dojo.dnd._validNodes = {"div": 1, "p": 1, "td": 1}; |
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| 40 | dojo.dnd._validOverflow = {"auto": 1, "scroll": 1}; |
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| 41 | |
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| 42 | dojo.dnd.autoScrollNodes = function(e){ |
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| 43 | // summary: |
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| 44 | // a handler for onmousemove event, which scrolls the first avaialble |
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| 45 | // Dom element, it falls back to dojo.dnd.autoScroll() |
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| 46 | // e: Event |
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| 47 | // onmousemove event |
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| 48 | |
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| 49 | // FIXME: needs more docs! |
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| 50 | |
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| 51 | var b, t, w, h, rx, ry, dx = 0, dy = 0, oldLeft, oldTop; |
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| 52 | |
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| 53 | for(var n = e.target; n;){ |
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| 54 | if(n.nodeType == 1 && (n.tagName.toLowerCase() in dojo.dnd._validNodes)){ |
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| 55 | var s = dojo.getComputedStyle(n), |
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| 56 | overflow = (s.overflow.toLowerCase() in dojo.dnd._validOverflow), |
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| 57 | overflowX = (s.overflowX.toLowerCase() in dojo.dnd._validOverflow), |
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| 58 | overflowY = (s.overflowY.toLowerCase() in dojo.dnd._validOverflow); |
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| 59 | if(overflow || overflowX || overflowY){ |
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| 60 | b = dojo._getContentBox(n, s); |
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| 61 | t = dojo.position(n, true); |
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| 62 | } |
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| 63 | // overflow-x |
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| 64 | if(overflow || overflowX){ |
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| 65 | w = Math.min(dojo.dnd.H_TRIGGER_AUTOSCROLL, b.w / 2); |
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| 66 | rx = e.pageX - t.x; |
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| 67 | if(dojo.isWebKit || dojo.isOpera){ |
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| 68 | // FIXME: this code should not be here, it should be taken into account |
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| 69 | // either by the event fixing code, or the dojo.position() |
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| 70 | // FIXME: this code doesn't work on Opera 9.5 Beta |
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| 71 | rx += dojo.body().scrollLeft; |
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| 72 | } |
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| 73 | dx = 0; |
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| 74 | if(rx > 0 && rx < b.w){ |
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| 75 | if(rx < w){ |
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| 76 | dx = -w; |
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| 77 | }else if(rx > b.w - w){ |
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| 78 | dx = w; |
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| 79 | } |
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| 80 | oldLeft = n.scrollLeft; |
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| 81 | n.scrollLeft = n.scrollLeft + dx; |
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| 82 | } |
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| 83 | } |
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| 84 | // overflow-y |
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| 85 | if(overflow || overflowY){ |
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| 86 | //console.log(b.l, b.t, t.x, t.y, n.scrollLeft, n.scrollTop); |
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| 87 | h = Math.min(dojo.dnd.V_TRIGGER_AUTOSCROLL, b.h / 2); |
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| 88 | ry = e.pageY - t.y; |
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| 89 | if(dojo.isWebKit || dojo.isOpera){ |
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| 90 | // FIXME: this code should not be here, it should be taken into account |
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| 91 | // either by the event fixing code, or the dojo.position() |
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| 92 | // FIXME: this code doesn't work on Opera 9.5 Beta |
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| 93 | ry += dojo.body().scrollTop; |
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| 94 | } |
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| 95 | dy = 0; |
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| 96 | if(ry > 0 && ry < b.h){ |
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| 97 | if(ry < h){ |
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| 98 | dy = -h; |
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| 99 | }else if(ry > b.h - h){ |
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| 100 | dy = h; |
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| 101 | } |
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| 102 | oldTop = n.scrollTop; |
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| 103 | n.scrollTop = n.scrollTop + dy; |
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| 104 | } |
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| 105 | } |
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| 106 | if(dx || dy){ return; } |
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| 107 | } |
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| 108 | try{ |
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| 109 | n = n.parentNode; |
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| 110 | }catch(x){ |
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| 111 | n = null; |
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| 112 | } |
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| 113 | } |
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| 114 | dojo.dnd.autoScroll(e); |
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| 115 | }; |
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| 116 | |
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| 117 | return dojo.dnd; |
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| 118 | }); |
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