Index: third_party/WebKit/Source/core/layout/ng/inline/ng_inline_box_state.h |
diff --git a/third_party/WebKit/Source/core/layout/ng/inline/ng_inline_box_state.h b/third_party/WebKit/Source/core/layout/ng/inline/ng_inline_box_state.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..c09b91e1bb2009dc6aacdc233f679dc49664055d |
--- /dev/null |
+++ b/third_party/WebKit/Source/core/layout/ng/inline/ng_inline_box_state.h |
@@ -0,0 +1,87 @@ |
+// Copyright 2017 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. |
+ |
+#ifndef NGInlineBoxState_h |
+#define NGInlineBoxState_h |
+ |
+#include "core/CoreExport.h" |
+#include "core/layout/ng/inline/ng_line_height_metrics.h" |
+#include "core/style/ComputedStyleConstants.h" |
+#include "platform/LayoutUnit.h" |
+#include "platform/fonts/FontBaseline.h" |
+#include "platform/wtf/Vector.h" |
+ |
+namespace blink { |
+ |
+class NGLayoutInlineItem; |
+class NGLineBoxFragmentBuilder; |
+class NGTextFragmentBuilder; |
+ |
+// Fragments that require the layout position/size of ancestor are packed in |
+// this struct. |
+struct NGPendingPositions { |
+ unsigned fragment_start; |
+ unsigned fragment_end; |
+ NGLineHeightMetrics metrics; |
+ EVerticalAlign vertical_align; |
+}; |
+ |
+// Represents the current box while NGInlineLayoutAlgorithm performs layout. |
+// Used 1) to cache common values for a box, and 2) to layout children that |
+// require ancestor position or size. |
+struct NGInlineBoxState { |
+ unsigned fragment_start; |
+ const ComputedStyle* style; |
+ NGLineHeightMetrics metrics; |
+ NGLineHeightMetrics text_metrics; |
+ LayoutUnit text_top; |
+ Vector<NGPendingPositions> pending_descendants; |
+ bool include_used_fonts = false; |
+ |
+ // Compute text metrics for a box. All text in a box share the same metrics. |
+ void ComputeTextMetrics(const NGLayoutInlineItem&, FontBaseline); |
+}; |
+ |
+// Represents the inline tree structure. This class provides: |
+// 1) Allow access to fragments belonging to the current box. |
+// 2) Performs layout when the positin/size of a box was computed. |
+// 3) Cache common values for a box. |
+class NGInlineLayoutStateStack { |
+ public: |
+ // Initialize the box state stack for a new line. |
+ // @return The initial box state for the line. |
+ NGInlineBoxState* OnBeginPlaceItems(const ComputedStyle*); |
+ |
+ // Push a box state stack. |
+ NGInlineBoxState* OnOpenTag(const NGLayoutInlineItem&, |
+ NGLineBoxFragmentBuilder*, |
+ NGTextFragmentBuilder*); |
+ |
+ // Pop a box state stack. |
+ NGInlineBoxState* OnCloseTag(const NGLayoutInlineItem&, |
+ NGLineBoxFragmentBuilder*, |
+ NGInlineBoxState*); |
+ |
+ // Compute all the pending positioning at the end of a line. |
+ void OnEndPlaceItems(NGLineBoxFragmentBuilder*); |
+ |
+ private: |
+ // End of a box state, either explicitly by close tag, or implicitly at the |
+ // end of a line. |
+ void EndBoxState(NGInlineBoxState*, NGLineBoxFragmentBuilder*); |
+ |
+ // Compute vertical position for the 'vertical-align' property. |
+ // The timing to apply varies by values; some values apply at the layout of |
+ // the box was computed. Other values apply when the layout of the parent or |
+ // the line box was computed. |
+ // https://www.w3.org/TR/CSS22/visudet.html#propdef-vertical-align |
+ // https://www.w3.org/TR/css-inline-3/#propdef-vertical-align |
+ void ApplyBaselineShift(NGInlineBoxState*, NGLineBoxFragmentBuilder*); |
+ |
+ Vector<NGInlineBoxState, 4> stack_; |
+}; |
+ |
+} // namespace blink |
+ |
+#endif // NGInlineBoxState_h |