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Bug 1326406 Part 5 - Update document about float manager's coordinate space. r=dbaron

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MozReview-Commit-ID: LJVqs49CSqQ

--HG--
extra : rebase_source : a012fd57664e6a58358eb18feab664958f15340c
This commit is contained in:
Ting-Yu Lin 2017-01-23 16:37:07 +08:00
parent 6e5dfe2a8e
commit 0807932a97
1 changed files with 11 additions and 5 deletions
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16
layout/generic/nsFloatManager.h
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@ -64,6 +64,12 @@ struct nsFlowAreaRect {
* passing in the writing mode of the block formatting context (BFC), i.e.
* the of BlockReflowInput's writing mode.
*
* nsFloatManager uses a special logical coordinate space with inline
* coordinates on the line-axis and block coordinates on the block-axis
* based on the writing mode of the block formatting context. All the
* physical types like nsRect, nsPoint, etc. use this coordinate space. See
* FloatInfo::mRect for an example.
*
* [1] https://drafts.csswg.org/css-writing-modes/#line-mappings
* [2] https://drafts.csswg.org/css-writing-modes/#logical-to-physical
*/
@ -107,7 +113,7 @@ public:
const mozilla::LogicalRect& aRegion,
const nsSize& aContainerSize);
// Structure that stores the current state of a frame manager for
// Structure that stores the current state of a float manager for
// Save/Restore purposes.
struct SavedState {
explicit SavedState() {}
@ -515,10 +521,10 @@ private:
// NB! This is really a logical rect in a writing mode suitable for
// placing floats, which is not necessarily the actual writing mode
// either of the block which created the frame manager or the block
// that is calling the frame manager. The inline coordinates are in
// the line-relative axis of the frame manager and its block
// coordinates are in the frame manager's real block direction.
// either of the block which created the float manager or the block
// that is calling the float manager. The inline coordinates are in
// the line-relative axis of the float manager and its block
// coordinates are in the float manager's block direction.
nsRect mRect;
// Pointer to a concrete subclass of ShapeInfo or null, which means that
// there is no shape-outside.