f39e5352f0
This patch adds the EventTarget class and makes Node inherit from it. You can register event listeners on an EventTarget, and when you call dispatch_event() on it, the event listeners will get invoked. An event listener is basically a wrapper around a JS::Function*. This is pretty far from how DOM events should eventually work, but it's a place to start and we'll build more on top of this. :^)
143 lines
4.5 KiB
C++
143 lines
4.5 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/StringBuilder.h>
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#include <LibJS/AST.h>
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#include <LibJS/Interpreter.h>
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#include <LibJS/Runtime/Function.h>
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#include <LibJS/Runtime/ScriptFunction.h>
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#include <LibWeb/Bindings/NodeWrapper.h>
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#include <LibWeb/CSS/StyleResolver.h>
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#include <LibWeb/DOM/Element.h>
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#include <LibWeb/DOM/EventListener.h>
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#include <LibWeb/DOM/HTMLAnchorElement.h>
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#include <LibWeb/DOM/Node.h>
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#include <LibWeb/Layout/LayoutBlock.h>
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#include <LibWeb/Layout/LayoutDocument.h>
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#include <LibWeb/Layout/LayoutInline.h>
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#include <LibWeb/Layout/LayoutNode.h>
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#include <LibWeb/Layout/LayoutText.h>
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namespace Web {
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Node::Node(Document& document, NodeType type)
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: m_document(document)
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, m_type(type)
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{
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}
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Node::~Node()
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{
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}
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const HTMLAnchorElement* Node::enclosing_link_element() const
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{
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for (auto* node = this; node; node = node->parent()) {
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if (is<HTMLAnchorElement>(*node) && to<HTMLAnchorElement>(*node).has_attribute("href"))
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return to<HTMLAnchorElement>(node);
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}
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return nullptr;
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}
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const HTMLElement* Node::enclosing_html_element() const
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{
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return first_ancestor_of_type<HTMLElement>();
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}
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String Node::text_content() const
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{
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Vector<String> strings;
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StringBuilder builder;
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for (auto* child = first_child(); child; child = child->next_sibling()) {
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auto text = child->text_content();
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if (!text.is_empty()) {
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builder.append(child->text_content());
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builder.append(' ');
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}
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}
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if (builder.length() > 1)
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builder.trim(1);
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return builder.to_string();
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}
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const Element* Node::next_element_sibling() const
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{
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for (auto* node = next_sibling(); node; node = node->next_sibling()) {
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if (node->is_element())
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return static_cast<const Element*>(node);
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}
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return nullptr;
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}
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const Element* Node::previous_element_sibling() const
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{
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for (auto* node = previous_sibling(); node; node = node->previous_sibling()) {
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if (node->is_element())
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return static_cast<const Element*>(node);
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}
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return nullptr;
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}
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RefPtr<LayoutNode> Node::create_layout_node(const StyleProperties*) const
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{
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return nullptr;
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}
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void Node::invalidate_style()
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{
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for_each_in_subtree_of_type<Element>([&](auto& element) {
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element.set_needs_style_update(true);
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return IterationDecision::Continue;
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});
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document().schedule_style_update();
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}
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bool Node::is_link() const
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{
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auto* enclosing_link = enclosing_link_element();
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if (!enclosing_link)
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return false;
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return enclosing_link->has_attribute("href");
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}
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void Node::dispatch_event(String event_name)
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{
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for (auto& listener : listeners()) {
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if (listener.event_name == event_name) {
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auto* function = const_cast<EventListener&>(*listener.listener).function();
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static_cast<const JS::ScriptFunction*>(function)->body().dump(0);
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auto* this_value = wrap(function->heap(), *this);
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dbg() << "calling event listener with this=" << this_value;
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document().interpreter().call(function, this_value, {});
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}
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}
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// FIXME: This is a hack. We should follow the real rules of event bubbling.
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if (parent())
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parent()->dispatch_event(move(event_name));
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}
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}
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