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Diffstat (limited to 'dom/flex/test/chrome/test_flex_items.html')
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diff --git a/dom/flex/test/chrome/test_flex_items.html b/dom/flex/test/chrome/test_flex_items.html new file mode 100644 index 0000000000..0bed577ae7 --- /dev/null +++ b/dom/flex/test/chrome/test_flex_items.html @@ -0,0 +1,316 @@ +<!doctype html> +<html> +<head> +<meta charset="utf-8"> +<script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script> +<link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css" /> +<style> + .container { + display: flex; + background-color: grey; + font: 14px sans-serif; + height: 50px; + } + #flex-sanity { + /* This just needs to be large enough so that no shrinking is required. */ + width: 1600px; + } + .clamped-huge-item { + flex: 1 1 1650px; /* This needs to be bigger than #flex-sanity, to test + the scenario it's aiming to test (early clamping of a + flex item which, if left unclamped, would've reversed + the direction of flexing & made everything shrink). */ + max-width: 10px; + } + + .base { align-self: baseline; } + .lastbase { align-self: last baseline; } + + .offset { margin-top: 10px; + margin-bottom: 3px; } + + .lime { background: lime; } + .yellow { background: yellow; } + .orange { background: orange; } + .pink { background: pink; } + .tan { background: tan; } + .white { background: white; } + + .crossMinMax { min-height: 40px; + max-height: 120px; } + + .mainMinMax { min-width: 120px; + max-width: 500px; } + + .flexGrow { flex-grow: 1; } + .spacer150 { width: 150px; + box-sizing: border-box; + height: 10px; + border: 1px solid teal; } + +</style> + +<script> +"use strict"; + +SimpleTest.waitForExplicitFinish(); + +const TEXT_NODE = Node.TEXT_NODE; + +function testItemMatchesExpectedValues(item, values, index) { + if (typeof(values.node) != "undefined") { + is(item.node, values.node, "Item index " + index + " has expected node."); + } + + if (typeof(values.mainBaseSize) != "undefined") { + is(item.mainBaseSize, values.mainBaseSize, "Item index " + index + " has expected mainBaseSize."); + } + + if (typeof(values.mainDeltaSize) != "undefined") { + is(item.mainDeltaSize, values.mainDeltaSize, "Item index " + index + " has expected mainDeltaSize."); + } + + if (typeof(values.mainMinSize) != "undefined") { + is(item.mainMinSize, values.mainMinSize, "Item index " + index + " has expected mainMinSize."); + } + + if (typeof(values.mainMaxSize) != "undefined") { + is(item.mainMaxSize, values.mainMaxSize, "Item index " + index + " has expected mainMaxSize."); + } else { + // If we didn't specify an expected mainMaxSize, then it's implied + // that the max main-size property (max-width/max-height) is at its + // default "none" value, which our FlexItem API represents as +infinity. + is(item.mainMaxSize, Number.POSITIVE_INFINITY, + "Item index " + index + " has expected (default) mainMaxSize."); + } + + if (typeof(values.crossMinSize) != "undefined") { + is(item.crossMinSize, values.crossMinSize, "Item index " + index + " has expected crossMinSize."); + } + + if (typeof(values.crossMaxSize) != "undefined") { + is(item.crossMaxSize, values.crossMaxSize, "Item index " + index + " has expected crossMaxSize."); + } else { + // As above for mainMaxSize, no-expected-value implies we expect +infinity. + is(item.crossMaxSize, Number.POSITIVE_INFINITY, + "Item index " + index + " has expected (default) crossMaxSize."); + } +} + +// Test for items in "flex-sanity" flex container: +function testFlexSanity() { + let container = document.getElementById("flex-sanity"); + let flex = container.getAsFlexContainer(); + let lines = flex.getLines(); + is(lines.length, 1, "Container should have expected number of lines."); + + let line = lines[0]; + let containerHeight = container.getBoundingClientRect().height; + is(line.crossSize, containerHeight, + "Line crossSize should equal the height of the container."); + + // We can't compare baselines precisely, so we'll just confirm that they + // appear somewhere within the elements that determine them. + // (This assumes the first rect is baseline-aligned.) + let firstRect = container.firstElementChild.getBoundingClientRect(); + ok(line.firstBaselineOffset > firstRect.top && + line.firstBaselineOffset < firstRect.bottom, + "Line firstBaselineOffset should land somewhere within the element " + + "that determines it."); + + // For last baseline, it's measured from the bottom, so we have to compare + // against the element bounds subtracted from the container height. + // We use the first node which uses last-baseline ("lb") alignment to + // provide the rect: + let lbElem = document.querySelector(".lastbase"); + let lbElemBoundingRect = lbElem.getBoundingClientRect(); + ok(line.lastBaselineOffset > containerHeight - lbElemBoundingRect.bottom && + line.lastBaselineOffset < containerHeight - lbElemBoundingRect.top, + "Line lastBaselineOffset should land somewhere within the element" + + "that determines it."); + + let expectedValues = [ + { crossMinSize: 0 }, + { mainBaseSize: 100, + mainDeltaSize: 0 }, + { crossMinSize: 40, + crossMaxSize: 120, + mainDeltaSize: 0 }, + { mainMinSize: 120, + mainMaxSize: 500, + mainDeltaSize: 0 }, + { mainMinSize: 120, + mainMaxSize: 500, + mainBaseSize: 150, + mainDeltaSize: 0 }, + { mainBaseSize: 10, + mainMaxSize: 5, + mainDeltaSize: 0 }, + { mainBaseSize: 10, + mainMinSize: 15, + mainDeltaSize: 0 }, + { mainBaseSize: 50, + mainMaxSize: 10 }, + { mainBaseSize: 1650, + mainMaxSize: 10, + mainDeltaSize: 0 }, + { mainDeltaSize: 0 }, + { /* final item is anonymous flex item */ }, + ]; + + let items = line.getItems(); + is(items.length, expectedValues.length, + "Line should have expected number of items."); + is(items.length, container.children.length + 1, + "Line should have as many items as the flex container has child elems, " + + "plus 1 for anonymous flex item"); + + for (let i = 0; i < items.length; ++i) { + let item = items[i]; + let values = expectedValues[i]; + // set the expected node to the node we're currently iterating over, + // except for: + // - the display:contents element (whose item is its first child) + // - the final item (which is an anonymous flex item around text) + if (i < container.children.length) { + let curElem = container.children[i]; + values.node = (curElem.style.display == "contents" + ? curElem.firstElementChild + : curElem); + } else { + is(container.lastChild.nodeType, TEXT_NODE, + "container's last child should be a text node"); + values.node = container.lastChild; + } + testItemMatchesExpectedValues(item, values, i); + } + + // Check that the delta size of the first item is (roughly) equal to the + // actual size minus the base size. + isfuzzy(items[0].mainDeltaSize, firstRect.width - items[0].mainBaseSize, 1e-4, + "flex-grow item should have expected mainDeltaSize."); +} + +// Test for items in "flex-growing" flex container: +function testFlexGrowing() { + let expectedValues = [ + { mainBaseSize: 10, + mainDeltaSize: 10, + mainMinSize: 35 }, + { mainBaseSize: 20, + mainDeltaSize: 5, + mainMinSize: 28 }, + { mainBaseSize: 30, + mainDeltaSize: 7 }, + { mainBaseSize: 0, + mainDeltaSize: 48, + mainMaxSize: 20 }, + ]; + + let container = document.getElementById("flex-growing"); + let items = container.getAsFlexContainer().getLines()[0].getItems(); + is(items.length, container.children.length, + "Line should have as many items as the flex container has child elems"); + + for (let i = 0; i < items.length; ++i) { + let item = items[i]; + let values = expectedValues[i]; + testItemMatchesExpectedValues(item, values, i); + } +} + +function runTests() { + testFlexSanity(); + testFlexGrowing(); + SimpleTest.finish(); +} +</script> +</head> + +<body onLoad="runTests();"> + <!-- First flex container to be tested: "flex-sanity". + We test a few general things, e.g.: + - accuracy of reported baselines. + - accuracy of reported flex base size, min/max sizes, & trivial deltas. + - flex items formation for display:contents subtrees & text nodes. + --> + <div id="flex-sanity" class="container"> + <div class="lime base flexGrow">one line (first)</div> + <div class="yellow lastbase" style="width: 100px">one line (last)</div> + <div class="orange offset lastbase crossMinMax">two<br/>lines and offset (last)</div> + <div class="pink offset base mainMinMax">offset (first)</div> + <!-- Inflexible item w/ content-derived flex base size, which has min/max + but doesn't violate them: --> + <div class="tan mainMinMax"> + <div class="spacer150"></div> + </div> + <!-- Inflexible item that is trivially clamped to smaller max-width: --> + <div style="flex: 0 0 10px; max-width: 5px"></div> + <!-- Inflexible item that is trivially clamped to larger min-width: --> + <div style="flex: 0 0 10px; min-width: 15px"></div> + <!-- Item that wants to grow but is trivially clamped to max-width + below base size: --> + <div style="flex: 1 1 50px; max-width: 10px"></div> + <div class="clamped-huge-item"></div> + <div style="display:contents"> + <div class="white">replaced</div> + </div> + anon item for text + </div> + + <!-- Second flex container to be tested, with items that grow by specific + predictable amounts. This ends up triggering 4 passes of the main + flexbox layout algorithm loop - and note that for each item, we only + report (via 'mainDeltaSize') the delta that it wanted in the *last pass + of the loop before that item was frozen*. + + Here's what goes on in each pass (and the tentative deltas) + * PASS 1 + - Available space = 120 - 10 - 20 - 30 - 0 = 60px. + - Sum of flex values = 1+1+2+16 = 20. So 1 "share" is 60px/20 = 3px. + - Deltas (space distributed): +3px, +3px, +6px, +48px + VIOLATIONS: + item0 is now 10+3 = 13px, which under its min + item1 is now 20+3 = 23px, which under its min + item3 is now 0+48 = 48px, which over its max + - the magnitude of max-violations (how far we're out of bounds) exceeds + magnitude of min-violations, so we prioritize the max-violations. + - So we freeze item3 at its max-width, 20px, leaving its final "desired" + mainDeltaSize at +48px from this pass. + + * PASS 2 + - Available space = 120 - 10 - 20 - 30 - 20 = 40px. + - Sum of flex values = 1+1+2 = 4. So 1 "share" is 40px/4 = 10px. + - Deltas (space distributed): +10px, +10px, +20px, +0px. + VIOLATIONS: + item0 is now 10+10 = 20px, which is under its min + - So we freeze item0 at its min-width, 35px, leaving its final "desired" + mainDeltaSize at +10px from this pass. + + * PASS 3 + - Available space = 120 - 35 - 20 - 30 - 20 = 15px. + - Sum of flex values = 1+2 = 3. So 1 "share" is 15px/3 = 5px. + - Deltas (space distributed): +0px, +5px, +10px, +0px. + VIOLATIONS: + item1 is now 20+5 = 25px, which is under its min + - So we freeze item1 at its min-width, 28px, leaving its final "desired" + mainDeltaSize at +5px from this pass. + + * PASS 4 + - Available space = 120 - 35 - 28 - 30 - 20 = 7px. + - Sum of flex values = 2. So 1 "share" is 7px/2 = 3.5px + - Deltas (space distributed): +0px, +0px, +7px, +0px. + VIOLATIONS: + None! (So, we'll be done after this pass!) + - So we freeze item2 (the only unfrozen item) at its flexed size, 37px, + and set its final "desired" mainDeltaSize to +7px from this pass. + - And we're done! + --> + <div id="flex-growing" class="container" style="width: 120px"> + <div style="flex: 1 10px; min-width: 35px"></div> + <div style="flex: 1 20px; min-width: 28px"></div> + <div style="flex: 2 30px; min-width: 0"></div> + <div style="flex: 16 0px; max-width: 20px"></div> + </div> +</body> +</html> |