OLD | NEW |
---|---|
1 /* | 1 /* |
2 * Copyright (C) 2009, 2010, 2011 Apple Inc. All rights reserved. | 2 * Copyright (C) 2009, 2010, 2011 Apple Inc. All rights reserved. |
3 * | 3 * |
4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
5 * modification, are permitted provided that the following conditions | 5 * modification, are permitted provided that the following conditions |
6 * are met: | 6 * are met: |
7 * 1. Redistributions of source code must retain the above copyright | 7 * 1. Redistributions of source code must retain the above copyright |
8 * notice, this list of conditions and the following disclaimer. | 8 * notice, this list of conditions and the following disclaimer. |
9 * 2. Redistributions in binary form must reproduce the above copyright | 9 * 2. Redistributions in binary form must reproduce the above copyright |
10 * notice, this list of conditions and the following disclaimer in the | 10 * notice, this list of conditions and the following disclaimer in the |
(...skipping 297 matching lines...) Expand 10 before | Expand all | Expand 10 after Loading... | |
308 // | 308 // |
309 // Starting from the scroll container relative location, removing the | 309 // Starting from the scroll container relative location, removing the |
310 // enclosing layer's offset and the content offset in the composited layer | 310 // enclosing layer's offset and the content offset in the composited layer |
311 // results in the parent-layer relative offset. | 311 // results in the parent-layer relative offset. |
312 FloatPoint parent_relative_sticky_box_offset = | 312 FloatPoint parent_relative_sticky_box_offset = |
313 constraints.ScrollContainerRelativeStickyBoxRect().Location(); | 313 constraints.ScrollContainerRelativeStickyBoxRect().Location(); |
314 | 314 |
315 // The enclosing layers offset returned from |convertToLayerCoords| must be | 315 // The enclosing layers offset returned from |convertToLayerCoords| must be |
316 // adjusted for both scroll and ancestor sticky elements. | 316 // adjusted for both scroll and ancestor sticky elements. |
317 LayoutPoint enclosing_layer_offset; | 317 LayoutPoint enclosing_layer_offset; |
318 compositing_container->ConvertToLayerCoords(ancestor_overflow_layer, | 318 bool is_descendant = false; |
flackr
2017/05/17 19:44:03
Is this not equivalent to !ScrollParent()?
yigu
2017/05/17 20:28:15
No. is_descendant will be false if compositing_con
flackr
2017/05/18 15:54:08
Composite which ancestor? If you apply will-change
| |
319 enclosing_layer_offset); | 319 compositing_container->ConvertToLayerCoords( |
320 ancestor_overflow_layer, enclosing_layer_offset, &is_descendant); | |
321 if (!is_descendant) | |
322 enclosing_layer_offset = LayoutPoint(); | |
flackr
2017/05/17 19:44:03
How does the sticky element know where it is with
yigu
2017/05/17 20:28:15
When the compositing_container is a descendant of
flackr
2017/05/18 15:54:08
My concern is when the scroller is not at the top-
| |
323 | |
320 DCHECK(!ScrollParent() || ScrollParent() == ancestor_overflow_layer); | 324 DCHECK(!ScrollParent() || ScrollParent() == ancestor_overflow_layer); |
321 if (!ScrollParent() && compositing_container != ancestor_overflow_layer) { | 325 if (!ScrollParent() && compositing_container != ancestor_overflow_layer) { |
322 enclosing_layer_offset += LayoutSize( | 326 enclosing_layer_offset += LayoutSize( |
323 ancestor_overflow_layer->GetScrollableArea()->GetScrollOffset()); | 327 ancestor_overflow_layer->GetScrollableArea()->GetScrollOffset()); |
324 } | 328 } |
325 // TODO(smcgruer): Until http://crbug.com/702229 is fixed, the nearest | 329 // TODO(smcgruer): Until http://crbug.com/702229 is fixed, the nearest |
326 // sticky ancestor may be non-composited which will make this offset wrong. | 330 // sticky ancestor may be non-composited which will make this offset wrong. |
327 if (const LayoutBoxModelObject* ancestor = | 331 if (const LayoutBoxModelObject* ancestor = |
328 constraints.NearestStickyAncestor()) { | 332 constraints.NearestStickyAncestor()) { |
329 enclosing_layer_offset -= | 333 enclosing_layer_offset -= |
(...skipping 3295 matching lines...) Expand 10 before | Expand all | Expand 10 after Loading... | |
3625 } else if (graphics_layer == decoration_outline_layer_.get()) { | 3629 } else if (graphics_layer == decoration_outline_layer_.get()) { |
3626 name = "Decoration Layer"; | 3630 name = "Decoration Layer"; |
3627 } else { | 3631 } else { |
3628 NOTREACHED(); | 3632 NOTREACHED(); |
3629 } | 3633 } |
3630 | 3634 |
3631 return name; | 3635 return name; |
3632 } | 3636 } |
3633 | 3637 |
3634 } // namespace blink | 3638 } // namespace blink |
OLD | NEW |