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ladybird/Userland/Libraries/LibWeb/Page/EventHandler.cpp
Andreas Kling ace1b34798 LibWeb: Reset the HTML editing cursor blink cycle on arrow key movement 
Also stop exposing the DOM cursor as a mutable reference on Frame,
since event handling code was using that to mess with the text offset
directly. Setting the cursor now always goes through the Frame where
we can reset the blink cycle appropriately.

This makes cursor movement look a lot more natural. :^)
2021-02-09 21:25:38 +01:00

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/*
* Copyright (c) 2020-2021, 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/Range.h>
#include <LibWeb/DOM/Text.h>
#include <LibWeb/HTML/HTMLAnchorElement.h>
#include <LibWeb/HTML/HTMLIFrameElement.h>
#include <LibWeb/HTML/HTMLImageElement.h>
#include <LibWeb/InProcessWebView.h>
#include <LibWeb/Layout/InitialContainingBlockBox.h>
#include <LibWeb/Page/EventHandler.h>
#include <LibWeb/Page/Frame.h>
#include <LibWeb/UIEvents/EventNames.h>
#include <LibWeb/UIEvents/MouseEvent.h>
namespace Web {
static Gfx::IntPoint compute_mouse_event_offset(const Gfx::IntPoint& position, const Layout::Node& 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)
, m_edit_event_handler(make<EditEventHandler>(frame))
{
}
EventHandler::~EventHandler()
{
}
const Layout::InitialContainingBlockBox* EventHandler::layout_root() const
{
if (!m_frame.document())
return nullptr;
return m_frame.document()->layout_node();
}
Layout::InitialContainingBlockBox* EventHandler::layout_root()
{
if (!m_frame.document())
return nullptr;
return m_frame.document()->layout_node();
}
bool EventHandler::handle_mouseup(const Gfx::IntPoint& position, unsigned button, unsigned modifiers)
{
if (!layout_root())
return false;
if (m_mouse_event_tracking_layout_node) {
m_mouse_event_tracking_layout_node->handle_mouseup({}, position, button, modifiers);
return true;
}
bool handled_event = false;
auto result = layout_root()->hit_test(position, Layout::HitTestType::Exact);
if (result.layout_node && result.layout_node->wants_mouse_events()) {
result.layout_node->handle_mouseup({}, position, button, modifiers);
// Things may have changed as a consequence of Layout::Node::handle_mouseup(). Hit test again.
if (!layout_root())
return true;
result = layout_root()->hit_test(position, Layout::HitTestType::Exact);
}
if (result.layout_node && result.layout_node->dom_node()) {
RefPtr<DOM::Node> node = result.layout_node->dom_node();
if (is<HTML::HTMLIFrameElement>(*node)) {
if (auto* subframe = downcast<HTML::HTMLIFrameElement>(*node).content_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(UIEvents::MouseEvent::create(UIEvents::EventNames::mouseup, offset.x(), offset.y()));
handled_event = true;
}
if (button == GUI::MouseButton::Left)
m_in_mouse_selection = false;
return handled_event;
}
bool EventHandler::handle_mousedown(const Gfx::IntPoint& position, unsigned button, unsigned modifiers)
{
if (!layout_root())
return false;
if (m_mouse_event_tracking_layout_node) {
m_mouse_event_tracking_layout_node->handle_mousedown({}, position, button, modifiers);
return true;
}
NonnullRefPtr document = *m_frame.document();
RefPtr<DOM::Node> node;
{
auto result = layout_root()->hit_test(position, Layout::HitTestType::Exact);
if (!result.layout_node)
return false;
node = result.layout_node->dom_node();
document->set_hovered_node(node);
if (result.layout_node->wants_mouse_events()) {
result.layout_node->handle_mousedown({}, position, button, modifiers);
return true;
}
if (!node)
return false;
if (is<HTML::HTMLIFrameElement>(*node)) {
if (auto* subframe = downcast<HTML::HTMLIFrameElement>(*node).content_frame())
return subframe->event_handler().handle_mousedown(position.translated(compute_mouse_event_offset({}, *result.layout_node)), button, modifiers);
return false;
}
if (auto* page = m_frame.page())
page->set_focused_frame({}, m_frame);
auto offset = compute_mouse_event_offset(position, *result.layout_node);
node->dispatch_event(UIEvents::MouseEvent::create(UIEvents::EventNames::mousedown, offset.x(), offset.y()));
}
// NOTE: Dispatching an event may have disturbed the world.
if (!layout_root() || layout_root() != node->document().layout_node())
return true;
if (button == GUI::MouseButton::Right && is<HTML::HTMLImageElement>(*node)) {
auto& image_element = downcast<HTML::HTMLImageElement>(*node);
auto image_url = image_element.document().complete_url(image_element.src());
if (auto* page = m_frame.page())
page->client().page_did_request_image_context_menu(m_frame.to_main_frame_position(position), image_url, "", modifiers, image_element.bitmap());
return true;
}
if (RefPtr<HTML::HTMLAnchorElement> link = node->enclosing_link_element()) {
auto href = link->href();
auto url = document->complete_url(href);
dbgln("Web::EventHandler: Clicking on a link to {}", url);
if (button == GUI::MouseButton::Left) {
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()) {
if (auto* page = m_frame.page())
page->client().page_did_click_link(url, link->target(), modifiers);
} else {
// FIXME: Handle different targets!
m_frame.loader().load(url, FrameLoader::Type::Navigation);
}
}
} else if (button == GUI::MouseButton::Right) {
if (auto* page = m_frame.page())
page->client().page_did_request_link_context_menu(m_frame.to_main_frame_position(position), url, link->target(), modifiers);
} else if (button == GUI::MouseButton::Middle) {
if (auto* page = m_frame.page())
page->client().page_did_middle_click_link(url, link->target(), modifiers);
}
} else {
if (button == GUI::MouseButton::Left) {
auto result = layout_root()->hit_test(position, Layout::HitTestType::TextCursor);
if (result.layout_node && result.layout_node->dom_node()) {
m_frame.set_cursor_position(DOM::Position(*node, result.index_in_node));
layout_root()->set_selection({ { result.layout_node, result.index_in_node }, {} });
m_in_mouse_selection = true;
}
} else if (button == GUI::MouseButton::Right) {
if (auto* page = m_frame.page())
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)
{
if (!layout_root())
return false;
if (m_mouse_event_tracking_layout_node) {
m_mouse_event_tracking_layout_node->handle_mousemove({}, position, buttons, modifiers);
return true;
}
auto& document = *m_frame.document();
bool hovered_node_changed = false;
bool is_hovering_link = false;
bool is_hovering_text = false;
auto result = layout_root()->hit_test(position, Layout::HitTestType::Exact);
const HTML::HTMLAnchorElement* hovered_link_element = nullptr;
if (result.layout_node) {
if (result.layout_node->wants_mouse_events()) {
document.set_hovered_node(result.layout_node->dom_node());
result.layout_node->handle_mousemove({}, position, buttons, modifiers);
// FIXME: It feels a bit aggressive to always update the cursor like this.
if (auto* page = m_frame.page())
page->client().page_did_request_cursor_change(Gfx::StandardCursor::None);
return true;
}
RefPtr<DOM::Node> node = result.layout_node->dom_node();
if (node && is<HTML::HTMLIFrameElement>(*node)) {
if (auto* subframe = downcast<HTML::HTMLIFrameElement>(*node).content_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) {
if (node->is_text())
is_hovering_text = true;
hovered_link_element = node->enclosing_link_element();
if (hovered_link_element)
is_hovering_link = true;
auto offset = compute_mouse_event_offset(position, *result.layout_node);
node->dispatch_event(UIEvents::MouseEvent::create(UIEvents::EventNames::mousemove, offset.x(), offset.y()));
// NOTE: Dispatching an event may have disturbed the world.
if (!layout_root() || layout_root() != node->document().layout_node())
return true;
}
if (m_in_mouse_selection) {
auto hit = layout_root()->hit_test(position, Layout::HitTestType::TextCursor);
if (hit.layout_node && hit.layout_node->dom_node()) {
layout_root()->set_selection_end({ hit.layout_node, hit.index_in_node });
}
if (auto* page = m_frame.page())
page->client().page_did_change_selection();
}
}
if (auto* page = m_frame.page()) {
if (is_hovering_link)
page->client().page_did_request_cursor_change(Gfx::StandardCursor::Hand);
else if (is_hovering_text)
page->client().page_did_request_cursor_change(Gfx::StandardCursor::IBeam);
else
page->client().page_did_request_cursor_change(Gfx::StandardCursor::None);
if (hovered_node_changed) {
RefPtr<HTML::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;
}
bool EventHandler::focus_next_element()
{
if (!m_frame.document())
return false;
auto* element = m_frame.document()->focused_element();
if (!element) {
element = m_frame.document()->first_child_of_type<DOM::Element>();
if (element && element->is_focusable()) {
m_frame.document()->set_focused_element(element);
return true;
}
}
for (element = element->next_element_in_pre_order(); element && !element->is_focusable(); element = element->next_element_in_pre_order())
;
m_frame.document()->set_focused_element(element);
return element;
}
bool EventHandler::focus_previous_element()
{
// FIXME: Implement Shift-Tab cycling backwards through focusable elements!
return false;
}
bool EventHandler::handle_keydown(KeyCode key, unsigned modifiers, u32 code_point)
{
if (key == KeyCode::Key_Tab) {
if (modifiers & KeyModifier::Mod_Shift)
return focus_previous_element();
else
return focus_next_element();
}
if (layout_root()->selection().is_valid()) {
auto range = layout_root()->selection().to_dom_range()->normalized();
if (range->start_container()->is_editable()) {
m_frame.document()->layout_node()->set_selection({});
// FIXME: This doesn't work for some reason?
m_frame.set_cursor_position({ *range->start_container(), range->start_offset() });
if (key == KeyCode::Key_Backspace || key == KeyCode::Key_Delete) {
m_edit_event_handler->handle_delete(range);
return true;
} else {
m_edit_event_handler->handle_delete(range);
m_edit_event_handler->handle_insert(m_frame.cursor_position(), code_point);
auto new_position = m_frame.cursor_position();
new_position.set_offset(new_position.offset() + 1);
m_frame.set_cursor_position(move(new_position));
return true;
}
}
}
if (m_frame.cursor_position().is_valid() && m_frame.cursor_position().node()->is_editable()) {
if (key == KeyCode::Key_Backspace) {
auto position = m_frame.cursor_position();
if (position.offset() == 0)
TODO();
auto new_position = m_frame.cursor_position();
new_position.set_offset(position.offset() - 1);
m_frame.set_cursor_position(move(new_position));
m_edit_event_handler->handle_delete(DOM::Range::create(*position.node(), position.offset() - 1, *position.node(), position.offset()));
return true;
} else if (key == KeyCode::Key_Delete) {
auto position = m_frame.cursor_position();
if (position.offset() >= downcast<DOM::Text>(position.node())->data().length())
TODO();
m_edit_event_handler->handle_delete(DOM::Range::create(*position.node(), position.offset(), *position.node(), position.offset() + 1));
return true;
} else if (key == KeyCode::Key_Right) {
auto position = m_frame.cursor_position();
if (position.offset() >= downcast<DOM::Text>(position.node())->data().length())
TODO();
auto new_position = m_frame.cursor_position();
new_position.set_offset(position.offset() + 1);
m_frame.set_cursor_position(move(new_position));
return true;
} else if (key == KeyCode::Key_Left) {
auto position = m_frame.cursor_position();
if (position.offset() == 0)
TODO();
auto new_position = m_frame.cursor_position();
new_position.set_offset(new_position.offset() - 1);
m_frame.set_cursor_position(move(new_position));
return true;
} else {
m_edit_event_handler->handle_insert(m_frame.cursor_position(), code_point);
auto new_position = m_frame.cursor_position();
new_position.set_offset(new_position.offset() + 1);
m_frame.set_cursor_position(move(new_position));
return true;
}
}
return false;
}
void EventHandler::set_mouse_event_tracking_layout_node(Layout::Node* layout_node)
{
if (layout_node)
m_mouse_event_tracking_layout_node = layout_node->make_weak_ptr();
else
m_mouse_event_tracking_layout_node = nullptr;
}
}
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