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LibWeb: Add some iteration helpers to LayoutNode

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- for_each_child_of_type<T>
- previous_sibling_of_type<T>
This commit is contained in:
Andreas Kling 2020-06-09 20:42:11 +02:00
parent f2d40ac2b2
commit b4d4d6b32a
Notes: sideshowbarker 2024-07-19 05:44:03 +09:00
2 changed files with 100 additions and 60 deletions
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2
Libraries/LibWeb/Forward.h
View file

@ -47,8 +47,10 @@ class HTMLImageElement;
class HTMLScriptElement;
class PageView;
class ImageData;
class LayoutBlock;
class LayoutDocument;
class LayoutNode;
class LayoutNodeWithStyle;
class LoadRequest;
class MouseEvent;
class Node;

158
Libraries/LibWeb/Layout/LayoutNode.h
View file

@ -31,6 +31,7 @@
#include <LibGfx/FloatRect.h>
#include <LibGfx/Rect.h>
#include <LibWeb/CSS/StyleProperties.h>
#include <LibWeb/Forward.h>
#include <LibWeb/Layout/BoxModelMetrics.h>
#include <LibWeb/Layout/LayoutPosition.h>
#include <LibWeb/RenderingContext.h>
@ -38,14 +39,51 @@
namespace Web {
class Document;
class Element;
class LayoutBlock;
class LayoutDocument;
class LayoutNode;
class LayoutNodeWithStyle;
class LineBoxFragment;
class Node;
template<typename T>
inline bool is(const LayoutNode&)
{
return false;
}
template<typename T>
inline bool is(const LayoutNode* node)
{
return !node || is<T>(*node);
}
template<>
inline bool is<LayoutNode>(const LayoutNode&)
{
return true;
}
template<typename T>
inline const T& to(const LayoutNode& node)
{
ASSERT(is<T>(node));
return static_cast<const T&>(node);
}
template<typename T>
inline T* to(LayoutNode* node)
{
ASSERT(is<T>(node));
return static_cast<T*>(node);
}
template<typename T>
inline const T* to(const LayoutNode* node)
{
ASSERT(is<T>(node));
return static_cast<const T*>(node);
}
template<typename T>
inline T& to(LayoutNode& node)
{
ASSERT(is<T>(node));
return static_cast<T&>(node);
}
struct HitTestResult {
RefPtr<LayoutNode> layout_node;
@ -82,6 +120,26 @@ public:
callback(*node);
}
template<typename T, typename Callback>
inline void for_each_child_of_type(Callback callback)
{
for (auto* node = first_child(); node; node = node->next_sibling()) {
if (!is<T>(node))
continue;
callback(to<T>(*node));
}
}
template<typename T, typename Callback>
inline void for_each_child_of_type(Callback callback) const
{
for (auto* node = first_child(); node; node = node->next_sibling()) {
if (!is<T>(node))
continue;
callback(to<T>(*node));
}
}
virtual const char* class_name() const = 0;
virtual bool is_root() const { return false; }
virtual bool is_text() const { return false; }
@ -144,6 +202,12 @@ public:
template<typename U>
U* next_sibling_of_type();
template<typename U>
const U* previous_sibling_of_type() const;
template<typename U>
U* previous_sibling_of_type();
template<typename T>
const T* first_child_of_type() const;
@ -225,58 +289,6 @@ inline LayoutNodeWithStyle* LayoutNode::parent()
return static_cast<LayoutNodeWithStyle*>(TreeNode<LayoutNode>::parent());
}
template<typename T>
inline bool is(const LayoutNode&)
{
return false;
}
template<typename T>
inline bool is(const LayoutNode* node)
{
return !node || is<T>(*node);
}
template<>
inline bool is<LayoutNode>(const LayoutNode&)
{
return true;
}
template<>
inline bool is<LayoutNodeWithStyle>(const LayoutNode& node)
{
return node.has_style();
}
template<typename T>
inline const T& to(const LayoutNode& node)
{
ASSERT(is<T>(node));
return static_cast<const T&>(node);
}
template<typename T>
inline T* to(LayoutNode* node)
{
ASSERT(is<T>(node));
return static_cast<T*>(node);
}
template<typename T>
inline const T* to(const LayoutNode* node)
{
ASSERT(is<T>(node));
return static_cast<const T*>(node);
}
template<typename T>
inline T& to(LayoutNode& node)
{
ASSERT(is<T>(node));
return static_cast<T&>(node);
}
template<typename T>
inline const T* LayoutNode::next_sibling_of_type() const
{
@ -297,6 +309,26 @@ inline T* LayoutNode::next_sibling_of_type()
return nullptr;
}
template<typename T>
inline const T* LayoutNode::previous_sibling_of_type() const
{
for (auto* sibling = previous_sibling(); sibling; sibling = sibling->previous_sibling()) {
if (is<T>(*sibling))
return &to<T>(*sibling);
}
return nullptr;
}
template<typename T>
inline T* LayoutNode::previous_sibling_of_type()
{
for (auto* sibling = previous_sibling(); sibling; sibling = sibling->previous_sibling()) {
if (is<T>(*sibling))
return &to<T>(*sibling);
}
return nullptr;
}
template<typename T>
inline const T* LayoutNode::first_child_of_type() const
{
@ -337,4 +369,10 @@ inline T* LayoutNode::first_ancestor_of_type()
return nullptr;
}
template<>
inline bool is<LayoutNodeWithStyle>(const LayoutNode& node)
{
return node.has_style();
}
}