ladybird/Libraries/LibWeb/Frame/EventHandler.cpp

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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT HOLDER 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 <LibGUI/Event.h>
#include <LibGUI/Window.h>
#include <LibJS/Runtime/Value.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/DOM/HTMLAnchorElement.h>
#include <LibWeb/DOM/HTMLIFrameElement.h>
#include <LibWeb/DOM/MouseEvent.h>
#include <LibWeb/Frame/EventHandler.h>
#include <LibWeb/Frame/Frame.h>
#include <LibWeb/Layout/LayoutDocument.h>
#include <LibWeb/PageView.h>
namespace Web {
static Gfx::IntPoint compute_mouse_event_offset(const Gfx::IntPoint& position, const LayoutNode& layout_node)
{
auto top_left_of_layout_node = layout_node.box_type_agnostic_position();
return {
position.x() - static_cast<int>(top_left_of_layout_node.x()),
position.y() - static_cast<int>(top_left_of_layout_node.y())
};
}
EventHandler::EventHandler(Badge<Frame>, Frame& frame)
: m_frame(frame)
{
}
EventHandler::~EventHandler()
{
}
const LayoutDocument* EventHandler::layout_root() const
{
if (!m_frame.document())
return nullptr;
return static_cast<LayoutDocument*>(m_frame.document()->layout_node());
}
LayoutDocument* EventHandler::layout_root()
{
if (!m_frame.document())
return nullptr;
return const_cast<LayoutDocument*>(m_frame.document()->layout_node());
}
bool EventHandler::handle_mouseup(const Gfx::IntPoint& position, unsigned button, unsigned modifiers)
{
auto* layout_root_ptr = this->layout_root();
if (!layout_root_ptr)
return false;
auto& layout_root = *layout_root_ptr;
bool handled_event = false;
auto result = layout_root.hit_test(position);
if (result.layout_node && result.layout_node->node()) {
RefPtr<Node> node = result.layout_node->node();
if (is<HTMLIFrameElement>(*node)) {
if (auto* subframe = to<HTMLIFrameElement>(*node).hosted_frame())
return subframe->event_handler().handle_mouseup(position.translated(compute_mouse_event_offset({}, *result.layout_node)), button, modifiers);
return false;
}
auto offset = compute_mouse_event_offset(position, *result.layout_node);
node->dispatch_event(MouseEvent::create("mouseup", offset.x(), offset.y()));
handled_event = true;
}
if (button == GUI::MouseButton::Left) {
dump_selection("MouseUp");
m_in_mouse_selection = false;
}
return handled_event;
}
bool EventHandler::handle_mousedown(const Gfx::IntPoint& position, unsigned button, unsigned modifiers)
{
auto* layout_root_ptr = this->layout_root();
if (!layout_root_ptr)
return false;
auto& layout_root = *layout_root_ptr;
auto& document = *m_frame.document();
auto& page_client = m_frame.page().client();
auto result = layout_root.hit_test(position);
if (!result.layout_node)
return false;
RefPtr<Node> node = result.layout_node->node();
document.set_hovered_node(node);
if (!node)
return false;
if (is<HTMLIFrameElement>(*node)) {
if (auto* subframe = to<HTMLIFrameElement>(*node).hosted_frame())
return subframe->event_handler().handle_mousedown(position.translated(compute_mouse_event_offset({}, *result.layout_node)), button, modifiers);
return false;
}
auto offset = compute_mouse_event_offset(position, *result.layout_node);
node->dispatch_event(MouseEvent::create("mousedown", offset.x(), offset.y()));
if (RefPtr<HTMLAnchorElement> link = node->enclosing_link_element()) {
dbg() << "Web::EventHandler: Clicking on a link to " << link->href();
if (button == GUI::MouseButton::Left) {
auto href = link->href();
if (href.starts_with("javascript:")) {
document.run_javascript(href.substring_view(11, href.length() - 11));
} else if (href.starts_with('#')) {
auto anchor = href.substring_view(1, href.length() - 1);
m_frame.scroll_to_anchor(anchor);
} else {
if (m_frame.is_main_frame()) {
page_client.page_did_click_link(link->href(), link->target(), modifiers);
} else {
// FIXME: Handle different targets!
m_frame.loader().load(document.complete_url(link->href()));
}
}
} else if (button == GUI::MouseButton::Right) {
page_client.page_did_request_link_context_menu(m_frame.to_main_frame_position(position), link->href(), link->target(), modifiers);
} else if (button == GUI::MouseButton::Middle) {
page_client.page_did_middle_click_link(link->href(), link->target(), modifiers);
}
} else {
if (button == GUI::MouseButton::Left) {
layout_root.selection().set({ result.layout_node, result.index_in_node }, {});
dump_selection("MouseDown");
m_in_mouse_selection = true;
}
else if (button == GUI::MouseButton::Right) {
page_client.page_did_request_context_menu(m_frame.to_main_frame_position(position));
}
}
return true;
}
bool EventHandler::handle_mousemove(const Gfx::IntPoint& position, unsigned buttons, unsigned modifiers)
{
auto* layout_root_ptr = this->layout_root();
if (!layout_root_ptr)
return false;
auto& layout_root = *layout_root_ptr;
auto& document = *m_frame.document();
auto& page_client = m_frame.page().client();
bool hovered_node_changed = false;
bool is_hovering_link = false;
auto result = layout_root.hit_test(position);
const HTMLAnchorElement* hovered_link_element = nullptr;
if (result.layout_node) {
RefPtr<Node> node = result.layout_node->node();
if (node && is<HTMLIFrameElement>(*node)) {
if (auto* subframe = to<HTMLIFrameElement>(*node).hosted_frame())
return subframe->event_handler().handle_mousemove(position.translated(compute_mouse_event_offset({}, *result.layout_node)), buttons, modifiers);
return false;
}
hovered_node_changed = node != document.hovered_node();
document.set_hovered_node(node);
if (node) {
hovered_link_element = node->enclosing_link_element();
if (hovered_link_element) {
#ifdef HTML_DEBUG
dbg() << "PageView: hovering over a link to " << hovered_link_element->href();
#endif
is_hovering_link = true;
}
auto offset = compute_mouse_event_offset(position, *result.layout_node);
node->dispatch_event(MouseEvent::create("mousemove", offset.x(), offset.y()));
}
if (m_in_mouse_selection) {
layout_root.selection().set_end({ result.layout_node, result.index_in_node });
dump_selection("MouseMove");
page_client.page_did_change_selection();
}
}
page_client.page_did_request_cursor_change(is_hovering_link ? GUI::StandardCursor::Hand : GUI::StandardCursor::None);
if (hovered_node_changed) {
RefPtr<HTMLElement> hovered_html_element = document.hovered_node() ? document.hovered_node()->enclosing_html_element() : nullptr;
if (hovered_html_element && !hovered_html_element->title().is_null()) {
page_client.page_did_enter_tooltip_area(m_frame.to_main_frame_position(position), hovered_html_element->title());
} else {
page_client.page_did_leave_tooltip_area();
}
if (is_hovering_link)
page_client.page_did_hover_link(document.complete_url(hovered_link_element->href()));
else
page_client.page_did_unhover_link();
}
return true;
}
void EventHandler::dump_selection(const char* event_name) const
{
UNUSED_PARAM(event_name);
#ifdef SELECTION_DEBUG
dbg() << event_name << " selection start: "
<< layout_root()->selection().start().layout_node << ":" << layout_root()->selection().start().index_in_node << ", end: "
<< layout_root()->selection().end().layout_node << ":" << layout_root()->selection().end().index_in_node;
#endif
}
}