[layoutng] Initial version of block layout

third_party/WebKit/Source/core/layout/ng/NGBlockLayoutAlgorithm.cpp

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "core/layout/ng/NGBlockLayoutAlgorithm.h"
+
+#include "core/layout/LayoutBox.h"
+#include "core/layout/ng/NGConstraintSpace.h"
+#include "core/style/ComputedStyle.h"
+
+namespace blink {
+
+NGBlockLayoutAlgorithm::NGBlockLayoutAlgorithm()
+{
+}
+
+NGConstraintSpace NGBlockLayoutAlgorithm::createConstraintSpaceFromLayoutObject(const LayoutBox& child)
+{
+    bool fixedInline = false, fixedBlock = false;
+    // XXX for orthogonal writing mode this is not right
+    LayoutUnit containerLogicalWidth = std::max(LayoutUnit(), child.containingBlockLogicalWidthForContent());
+    // XXX Make sure this height is correct
+    LayoutUnit containerLogicalHeight = child.containingBlockLogicalHeightForContent(ExcludeMarginBorderPadding);
+    if (child.hasOverrideLogicalContentWidth()) {
+        containerLogicalWidth = child.overrideLogicalContentWidth();
+        fixedInline = true;
+    }
+    if (child.hasOverrideLogicalContentHeight()) {
+        containerLogicalWidth = child.overrideLogicalContentHeight();
+        fixedBlock = true;
+    }
+    NGConstraintSpace space(containerLogicalWidth, containerLogicalHeight);
+    // XXX vertical writing mode
+    space.setOverflowTriggersScrollbar(child.styleRef().overflowX() == OverflowAuto,
+        child.styleRef().overflowY() == OverflowAuto);
+    space.setFixedSize(fixedInline, fixedBlock);
+    return space;
+}
+
+} // namespace blink