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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 |
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310 // | 310 // |
311 // Starting from the scroll container relative location, removing the | 311 // Starting from the scroll container relative location, removing the |
312 // enclosing layer's offset and the content offset in the composited layer | 312 // enclosing layer's offset and the content offset in the composited layer |
313 // results in the parent-layer relative offset. | 313 // results in the parent-layer relative offset. |
314 FloatPoint parent_relative_sticky_box_offset = | 314 FloatPoint parent_relative_sticky_box_offset = |
315 constraints.ScrollContainerRelativeStickyBoxRect().Location(); | 315 constraints.ScrollContainerRelativeStickyBoxRect().Location(); |
316 | 316 |
317 // The enclosing layers offset returned from |convertToLayerCoords| must be | 317 // The enclosing layers offset returned from |convertToLayerCoords| must be |
318 // adjusted for both scroll and ancestor sticky elements. | 318 // adjusted for both scroll and ancestor sticky elements. |
319 LayoutPoint enclosing_layer_offset; | 319 LayoutPoint enclosing_layer_offset; |
320 compositing_container->ConvertToLayerCoords(ancestor_overflow_layer, | 320 // The offset from the compositing_container to the ancestor_overflow_layer |
321 enclosing_layer_offset); | 321 // when we have a scroll parent is computed by the source_to_parent vector |
| 322 // on the transform node. |
| 323 // TODO(yigu): Eventually we want to remove the dependancy of |
| 324 // source_to_parent from StickyPositionOffset in property_tree.cc. |
| 325 if (!ScrollParent()) { |
| 326 compositing_container->ConvertToLayerCoords(ancestor_overflow_layer, |
| 327 enclosing_layer_offset); |
| 328 } |
| 329 |
322 DCHECK(!ScrollParent() || ScrollParent() == ancestor_overflow_layer); | 330 DCHECK(!ScrollParent() || ScrollParent() == ancestor_overflow_layer); |
323 if (!ScrollParent() && compositing_container != ancestor_overflow_layer) { | 331 if (!ScrollParent() && compositing_container != ancestor_overflow_layer) { |
324 enclosing_layer_offset += LayoutSize( | 332 enclosing_layer_offset += LayoutSize( |
325 ancestor_overflow_layer->GetScrollableArea()->GetScrollOffset()); | 333 ancestor_overflow_layer->GetScrollableArea()->GetScrollOffset()); |
326 } | 334 } |
327 // TODO(smcgruer): Until http://crbug.com/702229 is fixed, the nearest | 335 // TODO(smcgruer): Until http://crbug.com/702229 is fixed, the nearest |
328 // sticky ancestor may be non-composited which will make this offset wrong. | 336 // sticky ancestor may be non-composited which will make this offset wrong. |
329 if (const LayoutBoxModelObject* ancestor = | 337 if (const LayoutBoxModelObject* ancestor = |
330 constraints.NearestStickyAncestor()) { | 338 constraints.NearestStickyAncestor()) { |
331 enclosing_layer_offset -= | 339 enclosing_layer_offset -= |
332 RoundedIntSize(constraints_map.at(ancestor->Layer()) | 340 RoundedIntSize(constraints_map.at(ancestor->Layer()) |
333 .GetTotalContainingBlockStickyOffset()); | 341 .GetTotalContainingBlockStickyOffset()); |
334 } | 342 } |
335 | 343 |
336 DCHECK(!content_offset_in_compositing_layer_dirty_); | 344 DCHECK(!content_offset_in_compositing_layer_dirty_); |
337 parent_relative_sticky_box_offset.MoveBy( | 345 parent_relative_sticky_box_offset.MoveBy( |
338 FloatPoint(-enclosing_layer_offset) - | 346 FloatPoint(-enclosing_layer_offset) - |
339 FloatSize(ContentOffsetInCompositingLayer())); | 347 FloatSize(ContentOffsetInCompositingLayer())); |
340 | 348 |
341 if (compositing_container != ancestor_overflow_layer) { | 349 // When we have a scroll parent, the content offset is computed by |
| 350 // source_offset on the transform node. |
| 351 if (!ScrollParent() && compositing_container != ancestor_overflow_layer) { |
342 parent_relative_sticky_box_offset.MoveBy( | 352 parent_relative_sticky_box_offset.MoveBy( |
343 FloatPoint(compositing_container->GetCompositedLayerMapping() | 353 FloatPoint(compositing_container->GetCompositedLayerMapping() |
344 ->ContentOffsetInCompositingLayer())); | 354 ->ContentOffsetInCompositingLayer())); |
345 } | 355 } |
346 | 356 |
347 web_constraint.is_sticky = true; | 357 web_constraint.is_sticky = true; |
348 web_constraint.is_anchored_left = | 358 web_constraint.is_anchored_left = |
349 constraints.GetAnchorEdges() & | 359 constraints.GetAnchorEdges() & |
350 StickyPositionScrollingConstraints::kAnchorEdgeLeft; | 360 StickyPositionScrollingConstraints::kAnchorEdgeLeft; |
351 web_constraint.is_anchored_right = | 361 web_constraint.is_anchored_right = |
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3662 } else if (graphics_layer == decoration_outline_layer_.get()) { | 3672 } else if (graphics_layer == decoration_outline_layer_.get()) { |
3663 name = "Decoration Layer"; | 3673 name = "Decoration Layer"; |
3664 } else { | 3674 } else { |
3665 NOTREACHED(); | 3675 NOTREACHED(); |
3666 } | 3676 } |
3667 | 3677 |
3668 return name; | 3678 return name; |
3669 } | 3679 } |
3670 | 3680 |
3671 } // namespace blink | 3681 } // namespace blink |
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