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ladybird/Userland/Libraries/LibWeb/Layout/BreakNode.h

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Meta: Add license header to source files As suggested by Joshua, this commit adds the 2-clause BSD license as a comment block to the top of every source file. For the first pass, I've just added myself for simplicity. I encourage everyone to add themselves as copyright holders of any file they've added or modified in some significant way. If I've added myself in error somewhere, feel free to replace it with the appropriate copyright holder instead. Going forward, all new source files should include a license header.
2020-01-18 09:38:21 +01:00
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
Everything: Move to SPDX license identifiers in all files. SPDX License Identifiers are a more compact / standardized way of representing file license information. See: https://spdx.dev/resources/use/#identifiers This was done with the `ambr` search and replace tool. ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
2021-04-22 01:24:48 -07:00
* SPDX-License-Identifier: BSD-2-Clause
Meta: Add license header to source files As suggested by Joshua, this commit adds the 2-clause BSD license as a comment block to the top of every source file. For the first pass, I've just added myself for simplicity. I encourage everyone to add themselves as copyright holders of any file they've added or modified in some significant way. If I've added myself in error somewhere, feel free to replace it with the appropriate copyright holder instead. Going forward, all new source files should include a license header.
2020-01-18 09:38:21 +01:00
*/
LibHTML: Implement the <br> element for line breaking The <br> element will produce a special LayoutBreak node in the layout tree, which forces a break in the line layout whenever encountered. This patch also makes LayoutBlock use the current line-height as the minimum effective height for each line box. This ensures that having multiple <br> elements in a row doesn't create 0-height line boxes.
2019-10-12 13:47:49 +02:00
#pragma once
LibWeb: Move HTML object model stuff into LibWeb/HTML/ Take a hint from SVG and more all the HTML classes into HTML instead of mixing them with the DOM classes.
2020-07-26 15:08:16 +02:00
#include <LibWeb/HTML/HTMLBRElement.h>
LibWeb: Rename LayoutNode classes and move them into Layout namespace Bring the names of various boxes closer to spec language. This should hopefully make things easier to understand and hack on. :^) Some notable changes: - LayoutNode -> Layout::Node - LayoutBox -> Layout::Box - LayoutBlock -> Layout::BlockBox - LayoutReplaced -> Layout::ReplacedBox - LayoutDocument -> Layout::InitialContainingBlockBox - LayoutText -> Layout::TextNode - LayoutInline -> Layout::InlineNode Note that this is not strictly a "box tree" as we also hang inline/text nodes in the same tree, and they don't generate boxes. (Instead, they contribute line box fragments to their containing block!)
2020-11-22 15:53:01 +01:00
#include <LibWeb/Layout/Node.h>
LibHTML: Implement the <br> element for line breaking The <br> element will produce a special LayoutBreak node in the layout tree, which forces a break in the line layout whenever encountered. This patch also makes LayoutBlock use the current line-height as the minimum effective height for each line box. This ensures that having multiple <br> elements in a row doesn't create 0-height line boxes.
2019-10-12 13:47:49 +02:00
LibWeb: Rename LayoutNode classes and move them into Layout namespace Bring the names of various boxes closer to spec language. This should hopefully make things easier to understand and hack on. :^) Some notable changes: - LayoutNode -> Layout::Node - LayoutBox -> Layout::Box - LayoutBlock -> Layout::BlockBox - LayoutReplaced -> Layout::ReplacedBox - LayoutDocument -> Layout::InitialContainingBlockBox - LayoutText -> Layout::TextNode - LayoutInline -> Layout::InlineNode Note that this is not strictly a "box tree" as we also hang inline/text nodes in the same tree, and they don't generate boxes. (Instead, they contribute line box fragments to their containing block!)
2020-11-22 15:53:01 +01:00
namespace Web::Layout {
LibWeb: Move everything into the Web namespace
2020-03-07 10:27:02 +01:00
LibWeb: Rename LayoutNode classes and move them into Layout namespace Bring the names of various boxes closer to spec language. This should hopefully make things easier to understand and hack on. :^) Some notable changes: - LayoutNode -> Layout::Node - LayoutBox -> Layout::Box - LayoutBlock -> Layout::BlockBox - LayoutReplaced -> Layout::ReplacedBox - LayoutDocument -> Layout::InitialContainingBlockBox - LayoutText -> Layout::TextNode - LayoutInline -> Layout::InlineNode Note that this is not strictly a "box tree" as we also hang inline/text nodes in the same tree, and they don't generate boxes. (Instead, they contribute line box fragments to their containing block!)
2020-11-22 15:53:01 +01:00
class BreakNode final : public NodeWithStyleAndBoxModelMetrics {
LibWeb: Make the layout tree GC-allocated This removes a set of complex reference cycles between DOM, layout tree and browsing context. It also makes lifetimes much easier to reason about, as the DOM and layout trees are now free to keep each other alive.
2022-10-17 14:41:50 +02:00
JS_CELL(BreakNode, NodeWithStyleAndBoxModelMetrics);
LibHTML: Implement the <br> element for line breaking The <br> element will produce a special LayoutBreak node in the layout tree, which forces a break in the line layout whenever encountered. This patch also makes LayoutBlock use the current line-height as the minimum effective height for each line box. This ensures that having multiple <br> elements in a row doesn't create 0-height line boxes.
2019-10-12 13:47:49 +02:00
public:
LibWeb: Let <br> elements have style At the very least, we need to respect `<br style="display: none">`
2021-09-23 19:46:20 +02:00
BreakNode(DOM::Document&, HTML::HTMLBRElement&, NonnullRefPtr<CSS::StyleProperties>);
LibWeb: Rename LayoutNode classes and move them into Layout namespace Bring the names of various boxes closer to spec language. This should hopefully make things easier to understand and hack on. :^) Some notable changes: - LayoutNode -> Layout::Node - LayoutBox -> Layout::Box - LayoutBlock -> Layout::BlockBox - LayoutReplaced -> Layout::ReplacedBox - LayoutDocument -> Layout::InitialContainingBlockBox - LayoutText -> Layout::TextNode - LayoutInline -> Layout::InlineNode Note that this is not strictly a "box tree" as we also hang inline/text nodes in the same tree, and they don't generate boxes. (Instead, they contribute line box fragments to their containing block!)
2020-11-22 15:53:01 +01:00
virtual ~BreakNode() override;
LibHTML: Implement the <br> element for line breaking The <br> element will produce a special LayoutBreak node in the layout tree, which forces a break in the line layout whenever encountered. This patch also makes LayoutBlock use the current line-height as the minimum effective height for each line box. This ensures that having multiple <br> elements in a row doesn't create 0-height line boxes.
2019-10-12 13:47:49 +02:00
AK: Rename downcast<T> => verify_cast<T> This makes it much clearer what this cast actually does: it will VERIFY that the thing we're casting is a T (using is<T>()).
2021-06-24 19:53:42 +02:00
const HTML::HTMLBRElement& dom_node() const { return verify_cast<HTML::HTMLBRElement>(*Node::dom_node()); }
LibHTML: Implement the <br> element for line breaking The <br> element will produce a special LayoutBreak node in the layout tree, which forces a break in the line layout whenever encountered. This patch also makes LayoutBlock use the current line-height as the minimum effective height for each line box. This ensures that having multiple <br> elements in a row doesn't create 0-height line boxes.
2019-10-12 13:47:49 +02:00
private:
LibWeb: Fix inline blocks swallowing trailing whitespace In #10434 an issue with leading whitespace in new lines after a <br> element was fixed by checking whether the last fragment of LineBox is empty. However, this introduced a regression by which whitespace following inline elements was swallowed, so `<b>Test</b> 123` would appear like `Test123`. By asking specifically if we are handling a forced linebreak instead of implicity asking for a property that may be shared by other Node types, we can maintain the correct behavior in regards to leading whitespace on new lines, as well as trailing whitespace of inline elements.
2021-10-26 16:15:53 +02:00
virtual bool is_break_node() const final { return true; }
LibHTML: Implement the <br> element for line breaking The <br> element will produce a special LayoutBreak node in the layout tree, which forces a break in the line layout whenever encountered. This patch also makes LayoutBlock use the current line-height as the minimum effective height for each line box. This ensures that having multiple <br> elements in a row doesn't create 0-height line boxes.
2019-10-12 13:47:49 +02:00
};
LibWeb: Move everything into the Web namespace
2020-03-07 10:27:02 +01:00
LibWeb: Fix inline blocks swallowing trailing whitespace In #10434 an issue with leading whitespace in new lines after a <br> element was fixed by checking whether the last fragment of LineBox is empty. However, this introduced a regression by which whitespace following inline elements was swallowed, so `<b>Test</b> 123` would appear like `Test123`. By asking specifically if we are handling a forced linebreak instead of implicity asking for a property that may be shared by other Node types, we can maintain the correct behavior in regards to leading whitespace on new lines, as well as trailing whitespace of inline elements.
2021-10-26 16:15:53 +02:00
template<>
inline bool Node::fast_is<BreakNode>() const { return is_break_node(); }
LibWeb: Move everything into the Web namespace
2020-03-07 10:27:02 +01:00
}
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