[layoutng] Propagate fixed descendants of abs.

third_party/WebKit/Source/core/layout/ng/ng_out_of_flow_layout_part_test.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.

[ikilpatrick, 2017/01/31 01:12:15]

2017

[atotic, 2017/01/31 01:15:41]

done

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "core/layout/ng/ng_out_of_flow_layout_part.h"
+
+#include "core/layout/LayoutTestHelper.h"
+#include "core/dom/Element.h"
+
+namespace blink {
+namespace {
+
+class NGOutOfFlowLayoutPartTest : public RenderingTest {
+ public:
+  NGOutOfFlowLayoutPartTest(){};

[ikilpatrick, 2017/01/31 01:12:15]

you'll need to flip on the experimental flag to hit the right codepath?

[atotic, 2017/01/31 01:15:41]

huh? Please clarify.

[Gleb Lanbin, 2017/01/31 19:19:35]

you need something like
NGOutOfFlowLayoutPartTest() {
     RuntimeEnabledFeatures::setLayoutNGEnabled(true);
  }
   ~NGOutOfFlowLayoutPartTest() {  // Optional
     RuntimeEnabledFeatures::setLayoutNGEnabled(false);
   }

[atotic, 2017/02/01 01:37:19]

done

+};
+
+TEST_F(NGOutOfFlowLayoutPartTest, FixedInsideAbs) {

[Gleb Lanbin, 2017/01/31 19:19:35]

please add a short comment that describes what use case this test covers.

[atotic, 2017/02/01 01:37:19]

done.

+  setBodyInnerHTML(
+      "<style>body{padding:0px;margin:0px}</style>"
+      "<div id='rel' style='position:relative;'>"
+      "<div style='position:absolute;top:49px;left:0px;'>"
+      "<div style='width:100px;height:50px;background-color:yellow;'></div>"
+      "<div "
+      "id='fixed1'"

[Gleb Lanbin, 2017/01/31 19:19:35]

you can fit this at the previous line and below (for id='fixed2')

[atotic, 2017/02/01 01:37:19]

done

+      "style='position:fixed;background-color:gray;width:50px'>"
+      "<p>fixed static</p>"
+      "</div>"
+      "<div "
+      "id='fixed2'"
+      "style='position:fixed;background-color:gray;top:9px;left:7px;'>"
+      "<p>fixed plain</p>"
+      "</div>"
+      "</div>"
+      "</div>");
+  Element* fixed1 = document().getElementById("fixed1");
+  Element* fixed2 = document().getElementById("fixed2");

[ikilpatrick, 2017/01/31 01:14:12]

also might be good just to check there are N fragments in the resulting fragment
here.

[atotic, 2017/01/31 01:22:34]

There are no APIs to get fragment tree from Element. Are you suggesting
I synthesize a call to layout algorithm?

[Gleb Lanbin, 2017/01/31 19:19:35]

per discussion with Emil/Christian a Rendering test is an addition not a
replacement of our regular LayoutNG tests
See https://codereview.chromium.org/2560233003/ for more details
So we want to test LayoutNG fragment tree first and then we can optionally
verify that information got copied correctly to the old tree.
We have more examples in ng_block_layout_algorithm_test.cc

[atotic, 2017/02/01 01:37:19]

Fixed elements are currently directly positioned by LegacyLayout (#document
node).
I am unsure what fragments would you like to inspect?

My opinion is that what we is being tested right now is good enough for now.
We can revisit when #document starts using NGLayout.

- 

+  EXPECT_EQ(fixed1->offsetTop(), LayoutUnit(99));

[Gleb Lanbin, 2017/01/31 19:19:35]

please add a short comment that describes how we ended up with 99 here and
below.

[atotic, 2017/02/01 01:37:19]

done

+  EXPECT_EQ(fixed2->offsetTop(), LayoutUnit(9));
+};
+}

[Gleb Lanbin, 2017/01/31 19:19:35]

}  // namespace
}  // namespace blink

+}