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| 1 <!DOCTYPE html> |
| 2 <html> |
| 3 <head> |
| 4 <meta charset="utf-8"> |
| 5 <title>ScrollState constructor behaves correctly</title> |
| 6 <script src="../../../resources/testharness.js"></script> |
| 7 <script src="../../../resources/testharnessreport.js"></script> |
| 8 <style> |
| 9 |
| 10 * { |
| 11 margin:0; |
| 12 padding:0; |
| 13 } |
| 14 |
| 15 *::-webkit-scrollbar { |
| 16 width: 0 !important; |
| 17 height: 0 !important; |
| 18 } |
| 19 |
| 20 #a { |
| 21 height:400px; |
| 22 width:400px; |
| 23 overflow:scroll; |
| 24 } |
| 25 |
| 26 #b { |
| 27 height:500px; |
| 28 width:500px; |
| 29 background-color:purple; |
| 30 } |
| 31 |
| 32 #c { |
| 33 height:300px; |
| 34 width:300px; |
| 35 overflow:scroll; |
| 36 } |
| 37 |
| 38 #d { |
| 39 height:400px; |
| 40 width:400px; |
| 41 background-color:green; |
| 42 } |
| 43 |
| 44 body { |
| 45 height:3000px; |
| 46 } |
| 47 |
| 48 </style> |
| 49 </head> |
| 50 <body> |
| 51 |
| 52 <div id="a"> |
| 53 <div id="b"> |
| 54 <div id="c"> |
| 55 <div id="d"> |
| 56 </div> |
| 57 </div> |
| 58 </div> |
| 59 </div> |
| 60 |
| 61 <script> |
| 62 |
| 63 if (!window.internals || !window.internals.runtimeFlags.scrollCustomizationEnabl
ed || !window.eventSender) { |
| 64 console.log("These tests only work with window.internals and " + |
| 65 "window.eventSender exposed, and require scroll customization."); |
| 66 done(); |
| 67 } |
| 68 |
| 69 var originalApplyScroll = Element.prototype.applyScroll; |
| 70 var originalDistributeScroll = Element.prototype.distributeScroll; |
| 71 var deltas = [-85, -75, -65, -55, -45]; |
| 72 |
| 73 var elements = [ |
| 74 document.getElementById("d"), |
| 75 document.getElementById("c"), |
| 76 document.getElementById("b"), |
| 77 document.getElementById("a"), |
| 78 document.body, |
| 79 document.documentElement]; |
| 80 |
| 81 document.body.id = "body"; |
| 82 document.documentElement.id = "document"; |
| 83 |
| 84 function reset() { |
| 85 for (var i = 0; i < elements.length; ++i) { |
| 86 elements[i].scrollTop = 0; |
| 87 elements[i].unappliedDeltaY = []; |
| 88 elements[i].distributedDeltaY = []; |
| 89 elements[i].numberOfScrollEnds = 0; |
| 90 } |
| 91 |
| 92 Element.prototype.applyScroll = function(scrollState) { |
| 93 originalApplyScroll.call(this, scrollState); |
| 94 if (!scrollState.isEnding) |
| 95 this.unappliedDeltaY.push(scrollState.deltaY); |
| 96 } |
| 97 |
| 98 Element.prototype.distributeScroll = function(scrollState) { |
| 99 if (!scrollState.isEnding) |
| 100 this.distributedDeltaY.push(scrollState.deltaY); |
| 101 else |
| 102 this.numberOfScrollEnds++; |
| 103 originalDistributeScroll.call(this, scrollState); |
| 104 } |
| 105 } |
| 106 |
| 107 function applyDelta(d) { |
| 108 eventSender.gestureScrollBegin(10, 10); |
| 109 eventSender.gestureScrollUpdate(0, d); |
| 110 eventSender.gestureScrollEnd(0, 0); |
| 111 } |
| 112 |
| 113 test(function() { |
| 114 reset(); |
| 115 |
| 116 // Scroll five times, with four scrollable elements. |
| 117 var cScrollTop = [85, 100, 100, 100, 100]; |
| 118 var aScrollTop = [0, 0, 65, 100, 100]; |
| 119 var bodyScrollTop = [0, 0, 0, 0, 45]; |
| 120 |
| 121 for (var i = 0; i < deltas.length; ++i) { |
| 122 applyDelta(deltas[i]); |
| 123 assert_equals(a.scrollTop, aScrollTop[i], "For id 'a' on step " + i); |
| 124 assert_equals(c.scrollTop, cScrollTop[i], "For id 'c' on step " + i); |
| 125 assert_equals(document.body.scrollTop, bodyScrollTop[i], "For body on step "
+ i); |
| 126 } |
| 127 }, "Scroll offsets are modified correctly."); |
| 128 |
| 129 test(function() { |
| 130 reset(); |
| 131 |
| 132 // Scroll five times, with six elements. |
| 133 var unapplied = [ |
| 134 // d, the innermost element, never applies any scroll. |
| 135 [-85, -75, -65, -55, -45], |
| 136 // c applies the first two scrolls, and then hits its scroll extents. |
| 137 [0, 0, -65, -55, -45], |
| 138 // b doesn't scroll, and so leaves the same deltas unapplied as c. |
| 139 [0, 0, -65, -55, -45], |
| 140 // a hits its scroll extent on the second last step. |
| 141 [0, 0, 0, 0, -45], |
| 142 // body doesn't scroll (it's the documentElement that scrolls, but the body'
s |
| 143 // scrollTop updates), and so leaves the same deltas unapplied as a. |
| 144 [0, 0, 0, 0, -45], |
| 145 // The documentElement performs the frame scroll. |
| 146 [0, 0, 0, 0, 0]]; |
| 147 |
| 148 for (var i = 0; i < deltas.length; ++i) |
| 149 applyDelta(deltas[i]); |
| 150 |
| 151 for (var i = 0; i < elements.length; ++i) { |
| 152 var el = elements[i]; |
| 153 // Every element sees the same deltas being distributed. |
| 154 assert_array_equals(el.distributedDeltaY, deltas, "distributed delta for " +
el.id); |
| 155 assert_array_equals(el.unappliedDeltaY, unapplied[i], "unapplied delta for "
+ el.id); |
| 156 } |
| 157 |
| 158 // Ensure that the document leaves scroll unapplied when appropriate. |
| 159 var documentUnapplied = document.documentElement.unappliedDeltaY; |
| 160 applyDelta(-4000); |
| 161 assert_equals(documentUnapplied[documentUnapplied.length - 1], 0); |
| 162 applyDelta(-4000); |
| 163 assert_equals(documentUnapplied[documentUnapplied.length - 1], -4000); |
| 164 }, "Correct amount of delta is consumed."); |
| 165 |
| 166 test(function() { |
| 167 reset(); |
| 168 |
| 169 // Consume one pixel of delta per call to applyScroll. |
| 170 var applyScroll = Element.prototype.applyScroll; |
| 171 Element.prototype.applyScroll = function(scrollState) { |
| 172 if (scrollState.deltaY !== 0) |
| 173 scrollState.consumeDelta(0, -1); |
| 174 applyScroll.call(this, scrollState); |
| 175 } |
| 176 |
| 177 // Scroll five times, with four scrollable elements. |
| 178 // The scroll distance is decreased more the higher up the scroll chain the el
ement is. |
| 179 var cScrollTop = [85 - 2, 100, 100, 100, 100]; |
| 180 var aScrollTop = [0, 0, 65 - 4, 100, 100]; |
| 181 var bodyScrollTop = [0, 0, 0, 0, 45 - 6]; |
| 182 |
| 183 for (var i = 0; i < deltas.length; ++i) { |
| 184 applyDelta(deltas[i]); |
| 185 assert_equals(c.scrollTop, cScrollTop[i], "For id 'c' on step " + i); |
| 186 assert_equals(a.scrollTop, aScrollTop[i], "For id 'a' on step " + i); |
| 187 assert_equals(document.body.scrollTop, bodyScrollTop[i], "For body on step "
+ i); |
| 188 } |
| 189 }, "Consuming deltas prevents scrolling."); |
| 190 |
| 191 test(function() { |
| 192 reset(); |
| 193 |
| 194 for (var i = 0; i < deltas.length; ++i) |
| 195 applyDelta(deltas[i]); |
| 196 |
| 197 for (var i = 0; i < elements.length; ++i) |
| 198 assert_equals(elements[i].numberOfScrollEnds, deltas.length); |
| 199 }, "Correct number of scroll ends observed."); |
| 200 |
| 201 { |
| 202 var flingTest = async_test("Touchscreen fling doesn't propagate."); |
| 203 reset(); |
| 204 |
| 205 function assertScrollTops(cTop, aTop, bodyTop, step) { |
| 206 assert_equals(c.scrollTop, cTop, "For id 'c' on step " + step); |
| 207 assert_equals(a.scrollTop, aTop, "For id 'a' on step " + step); |
| 208 assert_equals(document.body.scrollTop, bodyTop, "For body on step " + step); |
| 209 }; |
| 210 |
| 211 var frame_actions = [ |
| 212 function() { |
| 213 eventSender.gestureFlingStart(10, 10, -1000000, -1000000, "touchscreen"); |
| 214 }, |
| 215 flingTest.step_func(function() { |
| 216 assertScrollTops(0, 0, 0, 1); |
| 217 }), |
| 218 flingTest.step_func(function() { |
| 219 assertScrollTops(100, 0, 0, 2); |
| 220 }), |
| 221 flingTest.step_func(function() { |
| 222 assertScrollTops(100, 0, 0, 3); |
| 223 }), |
| 224 flingTest.step_func(function() { |
| 225 assertScrollTops(100, 0, 0, 4); |
| 226 flingTest.done(); |
| 227 }) |
| 228 ] |
| 229 |
| 230 function executeFrameActions(frame_actions) { |
| 231 var frame = 0; |
| 232 function raf() { |
| 233 frame_actions[frame](); |
| 234 if (frame >= frame_actions.length) |
| 235 return; |
| 236 frame++; |
| 237 window.requestAnimationFrame(raf); |
| 238 } |
| 239 window.requestAnimationFrame(raf); |
| 240 } |
| 241 |
| 242 executeFrameActions(frame_actions); |
| 243 } |
| 244 </script> |
| 245 </body> |
| 246 </html> |
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Chromium Code Reviews
Issue 850443002:
Scroll Customization Prototype (Not for review, WIP) (Closed)
Base URL: https://chromium.googlesource.com/chromium/blink.git@master