| /* |
| * Copyright (C) 2007 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "third_party/blink/renderer/core/layout/layout_state.h" |
| |
| #include "third_party/blink/renderer/core/layout/layout_flow_thread.h" |
| #include "third_party/blink/renderer/core/layout/layout_inline.h" |
| #include "third_party/blink/renderer/core/layout/layout_view.h" |
| |
| namespace blink { |
| |
| LayoutState::LayoutState(LayoutView& view) |
| : is_paginated_(view.PageLogicalHeight()), |
| containing_block_logical_width_changed_(false), |
| pagination_state_changed_(false), |
| flow_thread_(nullptr), |
| next_(nullptr), |
| layout_object_(view) { |
| DCHECK(!view.GetLayoutState()); |
| view.PushLayoutState(*this); |
| } |
| |
| LayoutState::LayoutState(LayoutBox& layout_object, |
| bool containing_block_logical_width_changed) |
| : containing_block_logical_width_changed_( |
| containing_block_logical_width_changed), |
| next_(layout_object.View()->GetLayoutState()), |
| layout_object_(layout_object) { |
| if (layout_object.IsLayoutFlowThread()) |
| flow_thread_ = ToLayoutFlowThread(&layout_object); |
| else |
| flow_thread_ = next_->FlowThread(); |
| pagination_state_changed_ = next_->pagination_state_changed_; |
| height_offset_for_table_headers_ = next_->HeightOffsetForTableHeaders(); |
| height_offset_for_table_footers_ = next_->HeightOffsetForTableFooters(); |
| layout_object.View()->PushLayoutState(*this); |
| |
| if (layout_object.IsLayoutFlowThread()) { |
| // Entering a new pagination context. |
| pagination_offset_ = LayoutSize(); |
| is_paginated_ = true; |
| return; |
| } |
| |
| // Disable pagination for objects we don't support. For now this includes |
| // overflow:scroll/auto, inline blocks and writing mode roots. Additionally, |
| // pagination inside SVG is not allowed. |
| if (layout_object.GetPaginationBreakability() == LayoutBox::kForbidBreaks || |
| layout_object_.IsSVGChild()) { |
| flow_thread_ = nullptr; |
| is_paginated_ = false; |
| return; |
| } |
| |
| is_paginated_ = next_->is_paginated_; |
| if (!is_paginated_) |
| return; |
| |
| // Now adjust the pagination offset, so that we can easily figure out how far |
| // away we are from the start of the pagination context. |
| pagination_offset_ = |
| next_->pagination_offset_ + layout_object.LocationOffset(); |
| if (!layout_object.IsOutOfFlowPositioned()) |
| return; |
| if (LayoutObject* container = layout_object.Container()) { |
| if (container->StyleRef().HasInFlowPosition() && |
| container->IsLayoutInline()) { |
| pagination_offset_ += |
| ToLayoutInline(container)->OffsetForInFlowPositionedInline( |
| layout_object); |
| } |
| } |
| |
| // FIXME: <http://bugs.webkit.org/show_bug.cgi?id=13443> Apply control clip if |
| // present. |
| } |
| |
| LayoutState::LayoutState(LayoutObject& root) |
| : is_paginated_(false), |
| containing_block_logical_width_changed_(false), |
| pagination_state_changed_(false), |
| flow_thread_(nullptr), |
| next_(root.View()->GetLayoutState()), |
| layout_object_(root) { |
| DCHECK(!next_); |
| DCHECK(!root.IsLayoutView()); |
| root.View()->PushLayoutState(*this); |
| } |
| |
| LayoutState::~LayoutState() { |
| if (layout_object_.View()->GetLayoutState()) { |
| DCHECK_EQ(layout_object_.View()->GetLayoutState(), this); |
| layout_object_.View()->PopLayoutState(); |
| } |
| } |
| |
| LayoutUnit LayoutState::PageLogicalOffset( |
| const LayoutBox& child, |
| const LayoutUnit& child_logical_offset) const { |
| if (child.IsHorizontalWritingMode()) |
| return pagination_offset_.Height() + child_logical_offset; |
| return pagination_offset_.Width() + child_logical_offset; |
| } |
| |
| } // namespace blink |