498 lines
19 KiB
C++
498 lines
19 KiB
C++
/*
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* Copyright (c) 2020-2021, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2021, Max Wipfli <mail@maxwipfli.ch>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibGUI/Event.h>
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#include <LibWeb/DOM/Range.h>
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#include <LibWeb/DOM/Text.h>
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#include <LibWeb/DOM/Window.h>
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#include <LibWeb/HTML/HTMLAnchorElement.h>
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#include <LibWeb/HTML/HTMLIFrameElement.h>
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#include <LibWeb/HTML/HTMLImageElement.h>
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#include <LibWeb/Layout/InitialContainingBlock.h>
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#include <LibWeb/Page/BrowsingContext.h>
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#include <LibWeb/Page/EventHandler.h>
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#include <LibWeb/Page/Page.h>
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#include <LibWeb/UIEvents/EventNames.h>
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#include <LibWeb/UIEvents/KeyboardEvent.h>
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#include <LibWeb/UIEvents/MouseEvent.h>
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namespace Web {
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static Gfx::StandardCursor cursor_css_to_gfx(Optional<CSS::Cursor> cursor)
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{
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if (!cursor.has_value()) {
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return Gfx::StandardCursor::None;
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}
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switch (cursor.value()) {
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case CSS::Cursor::Crosshair:
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case CSS::Cursor::Cell:
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return Gfx::StandardCursor::Crosshair;
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case CSS::Cursor::Grab:
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case CSS::Cursor::Grabbing:
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return Gfx::StandardCursor::Drag;
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case CSS::Cursor::Pointer:
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return Gfx::StandardCursor::Hand;
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case CSS::Cursor::Help:
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return Gfx::StandardCursor::Help;
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case CSS::Cursor::None:
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return Gfx::StandardCursor::Hidden;
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case CSS::Cursor::Text:
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case CSS::Cursor::VerticalText:
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return Gfx::StandardCursor::IBeam;
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case CSS::Cursor::Move:
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case CSS::Cursor::AllScroll:
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return Gfx::StandardCursor::Move;
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case CSS::Cursor::Progress:
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case CSS::Cursor::Wait:
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return Gfx::StandardCursor::Wait;
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case CSS::Cursor::ColResize:
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return Gfx::StandardCursor::ResizeColumn;
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case CSS::Cursor::EResize:
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case CSS::Cursor::WResize:
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case CSS::Cursor::EwResize:
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return Gfx::StandardCursor::ResizeHorizontal;
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case CSS::Cursor::RowResize:
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return Gfx::StandardCursor::ResizeRow;
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case CSS::Cursor::NResize:
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case CSS::Cursor::SResize:
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case CSS::Cursor::NsResize:
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return Gfx::StandardCursor::ResizeVertical;
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case CSS::Cursor::NeResize:
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case CSS::Cursor::SwResize:
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case CSS::Cursor::NeswResize:
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return Gfx::StandardCursor::ResizeDiagonalBLTR;
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case CSS::Cursor::NwResize:
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case CSS::Cursor::SeResize:
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case CSS::Cursor::NwseResize:
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return Gfx::StandardCursor::ResizeDiagonalTLBR;
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default:
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return Gfx::StandardCursor::None;
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}
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}
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static Gfx::IntPoint compute_mouse_event_offset(const Gfx::IntPoint& position, const Layout::Node& layout_node)
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{
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auto top_left_of_layout_node = layout_node.box_type_agnostic_position();
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return {
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position.x() - static_cast<int>(top_left_of_layout_node.x()),
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position.y() - static_cast<int>(top_left_of_layout_node.y())
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};
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}
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EventHandler::EventHandler(Badge<BrowsingContext>, BrowsingContext& frame)
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: m_frame(frame)
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, m_edit_event_handler(make<EditEventHandler>(frame))
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{
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}
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EventHandler::~EventHandler()
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{
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}
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const Layout::InitialContainingBlock* EventHandler::layout_root() const
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{
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if (!m_frame.active_document())
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return nullptr;
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return m_frame.active_document()->layout_node();
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}
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Layout::InitialContainingBlock* EventHandler::layout_root()
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{
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if (!m_frame.active_document())
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return nullptr;
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return m_frame.active_document()->layout_node();
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}
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bool EventHandler::handle_mousewheel(const Gfx::IntPoint& position, unsigned int buttons, unsigned int modifiers, int wheel_delta)
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{
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if (!layout_root())
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return false;
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// FIXME: Support wheel events in subframes.
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auto result = layout_root()->hit_test(position, Layout::HitTestType::Exact);
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if (result.layout_node) {
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if (result.layout_node->handle_mousewheel({}, position, buttons, modifiers, wheel_delta))
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return true;
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}
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if (auto* page = m_frame.page()) {
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page->client().page_did_request_scroll(0, wheel_delta * 20);
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return true;
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}
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return false;
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}
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bool EventHandler::handle_mouseup(const Gfx::IntPoint& position, unsigned button, unsigned modifiers)
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{
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if (!layout_root())
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return false;
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if (m_mouse_event_tracking_layout_node) {
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m_mouse_event_tracking_layout_node->handle_mouseup({}, position, button, modifiers);
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return true;
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}
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bool handled_event = false;
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auto result = layout_root()->hit_test(position, Layout::HitTestType::Exact);
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if (result.layout_node && result.layout_node->wants_mouse_events()) {
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result.layout_node->handle_mouseup({}, position, button, modifiers);
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// Things may have changed as a consequence of Layout::Node::handle_mouseup(). Hit test again.
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if (!layout_root())
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return true;
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result = layout_root()->hit_test(position, Layout::HitTestType::Exact);
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}
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if (result.layout_node && result.layout_node->dom_node()) {
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RefPtr<DOM::Node> node = result.layout_node->dom_node();
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if (is<HTML::HTMLIFrameElement>(*node)) {
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if (auto* subframe = verify_cast<HTML::HTMLIFrameElement>(*node).nested_browsing_context())
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return subframe->event_handler().handle_mouseup(position.translated(compute_mouse_event_offset({}, *result.layout_node)), button, modifiers);
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return false;
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}
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auto offset = compute_mouse_event_offset(position, *result.layout_node);
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node->dispatch_event(UIEvents::MouseEvent::create(UIEvents::EventNames::mouseup, offset.x(), offset.y(), position.x(), position.y()));
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handled_event = true;
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}
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if (button == GUI::MouseButton::Left)
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m_in_mouse_selection = false;
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return handled_event;
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}
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bool EventHandler::handle_mousedown(const Gfx::IntPoint& position, unsigned button, unsigned modifiers)
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{
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if (!layout_root())
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return false;
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if (m_mouse_event_tracking_layout_node) {
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m_mouse_event_tracking_layout_node->handle_mousedown({}, position, button, modifiers);
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return true;
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}
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NonnullRefPtr document = *m_frame.active_document();
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// TODO: Allow selecting element behind if one on top has pointer-events set to none.
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auto result = layout_root()->hit_test(position, Layout::HitTestType::Exact);
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auto pointer_events = result.layout_node->computed_values().pointer_events();
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if (pointer_events == CSS::PointerEvents::None)
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return false;
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RefPtr<DOM::Node> node;
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{
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if (!result.layout_node)
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return false;
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node = result.layout_node->dom_node();
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document->set_hovered_node(node);
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if (result.layout_node->wants_mouse_events()) {
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result.layout_node->handle_mousedown({}, position, button, modifiers);
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return true;
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}
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if (!node)
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return false;
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if (is<HTML::HTMLIFrameElement>(*node)) {
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if (auto* subframe = verify_cast<HTML::HTMLIFrameElement>(*node).nested_browsing_context())
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return subframe->event_handler().handle_mousedown(position.translated(compute_mouse_event_offset({}, *result.layout_node)), button, modifiers);
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return false;
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}
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if (auto* page = m_frame.page())
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page->set_focused_browsing_context({}, m_frame);
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auto offset = compute_mouse_event_offset(position, *result.layout_node);
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node->dispatch_event(UIEvents::MouseEvent::create(UIEvents::EventNames::mousedown, offset.x(), offset.y(), position.x(), position.y()));
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}
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// NOTE: Dispatching an event may have disturbed the world.
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if (!layout_root() || layout_root() != node->document().layout_node())
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return true;
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if (button == GUI::MouseButton::Right && is<HTML::HTMLImageElement>(*node)) {
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auto& image_element = verify_cast<HTML::HTMLImageElement>(*node);
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auto image_url = image_element.document().parse_url(image_element.src());
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if (auto* page = m_frame.page())
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page->client().page_did_request_image_context_menu(m_frame.to_top_level_position(position), image_url, "", modifiers, image_element.bitmap());
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return true;
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}
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if (RefPtr<HTML::HTMLAnchorElement> link = node->enclosing_link_element()) {
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auto href = link->href();
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auto url = document->parse_url(href);
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dbgln("Web::EventHandler: Clicking on a link to {}", url);
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if (button == GUI::MouseButton::Left) {
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if (href.starts_with("javascript:")) {
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document->run_javascript(href.substring_view(11, href.length() - 11));
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} else if (href.starts_with('#')) {
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auto anchor = href.substring_view(1, href.length() - 1);
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m_frame.scroll_to_anchor(anchor);
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} else {
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document->set_active_element(link);
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if (m_frame.is_top_level()) {
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if (auto* page = m_frame.page())
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page->client().page_did_click_link(url, link->target(), modifiers);
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} else {
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// FIXME: Handle different targets!
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m_frame.loader().load(url, FrameLoader::Type::Navigation);
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}
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}
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} else if (button == GUI::MouseButton::Right) {
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if (auto* page = m_frame.page())
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page->client().page_did_request_link_context_menu(m_frame.to_top_level_position(position), url, link->target(), modifiers);
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} else if (button == GUI::MouseButton::Middle) {
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if (auto* page = m_frame.page())
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page->client().page_did_middle_click_link(url, link->target(), modifiers);
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}
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} else {
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if (button == GUI::MouseButton::Left) {
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auto result = layout_root()->hit_test(position, Layout::HitTestType::TextCursor);
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if (result.layout_node && result.layout_node->dom_node()) {
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m_frame.set_cursor_position(DOM::Position(*result.layout_node->dom_node(), result.index_in_node));
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layout_root()->set_selection({ { result.layout_node, result.index_in_node }, {} });
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m_in_mouse_selection = true;
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}
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} else if (button == GUI::MouseButton::Right) {
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if (auto* page = m_frame.page())
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page->client().page_did_request_context_menu(m_frame.to_top_level_position(position));
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}
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}
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return true;
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}
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bool EventHandler::handle_mousemove(const Gfx::IntPoint& position, unsigned buttons, unsigned modifiers)
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{
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if (!layout_root())
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return false;
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if (m_mouse_event_tracking_layout_node) {
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m_mouse_event_tracking_layout_node->handle_mousemove({}, position, buttons, modifiers);
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return true;
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}
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auto& document = *m_frame.active_document();
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bool hovered_node_changed = false;
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bool is_hovering_link = false;
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Gfx::StandardCursor hovered_node_cursor = Gfx::StandardCursor::None;
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auto result = layout_root()->hit_test(position, Layout::HitTestType::Exact);
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const HTML::HTMLAnchorElement* hovered_link_element = nullptr;
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if (result.layout_node) {
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if (result.layout_node->wants_mouse_events()) {
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document.set_hovered_node(result.layout_node->dom_node());
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result.layout_node->handle_mousemove({}, position, buttons, modifiers);
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// FIXME: It feels a bit aggressive to always update the cursor like this.
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if (auto* page = m_frame.page())
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page->client().page_did_request_cursor_change(Gfx::StandardCursor::None);
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return true;
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}
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RefPtr<DOM::Node> node = result.layout_node->dom_node();
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if (node && is<HTML::HTMLIFrameElement>(*node)) {
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if (auto* subframe = verify_cast<HTML::HTMLIFrameElement>(*node).nested_browsing_context())
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return subframe->event_handler().handle_mousemove(position.translated(compute_mouse_event_offset({}, *result.layout_node)), buttons, modifiers);
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return false;
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}
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auto pointer_events = result.layout_node->computed_values().pointer_events();
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if (pointer_events == CSS::PointerEvents::None)
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return false;
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hovered_node_changed = node != document.hovered_node();
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document.set_hovered_node(node);
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if (node) {
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hovered_link_element = node->enclosing_link_element();
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if (hovered_link_element)
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is_hovering_link = true;
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if (node->is_text()) {
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auto cursor = result.layout_node->computed_values().cursor();
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if (cursor == CSS::Cursor::Auto)
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hovered_node_cursor = Gfx::StandardCursor::IBeam;
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else
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hovered_node_cursor = cursor_css_to_gfx(cursor);
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}
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auto offset = compute_mouse_event_offset(position, *result.layout_node);
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node->dispatch_event(UIEvents::MouseEvent::create(UIEvents::EventNames::mousemove, offset.x(), offset.y(), position.x(), position.y()));
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// NOTE: Dispatching an event may have disturbed the world.
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if (!layout_root() || layout_root() != node->document().layout_node())
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return true;
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}
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if (m_in_mouse_selection) {
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auto hit = layout_root()->hit_test(position, Layout::HitTestType::TextCursor);
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if (hit.layout_node && hit.layout_node->dom_node()) {
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m_frame.set_cursor_position(DOM::Position(*hit.layout_node->dom_node(), result.index_in_node));
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layout_root()->set_selection_end({ hit.layout_node, hit.index_in_node });
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}
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if (auto* page = m_frame.page())
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page->client().page_did_change_selection();
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}
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}
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if (auto* page = m_frame.page()) {
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page->client().page_did_request_cursor_change(hovered_node_cursor);
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if (hovered_node_changed) {
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RefPtr<HTML::HTMLElement> hovered_html_element = document.hovered_node() ? document.hovered_node()->enclosing_html_element_with_attribute(HTML::AttributeNames::title) : nullptr;
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if (hovered_html_element && !hovered_html_element->title().is_null()) {
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page->client().page_did_enter_tooltip_area(m_frame.to_top_level_position(position), hovered_html_element->title());
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} else {
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page->client().page_did_leave_tooltip_area();
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}
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if (is_hovering_link)
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page->client().page_did_hover_link(document.parse_url(hovered_link_element->href()));
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else
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page->client().page_did_unhover_link();
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}
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}
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return true;
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}
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bool EventHandler::focus_next_element()
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{
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if (!m_frame.active_document())
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return false;
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auto* element = m_frame.active_document()->focused_element();
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if (!element) {
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element = m_frame.active_document()->first_child_of_type<DOM::Element>();
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if (element && element->is_focusable()) {
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m_frame.active_document()->set_focused_element(element);
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return true;
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}
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}
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for (element = element->next_element_in_pre_order(); element && !element->is_focusable(); element = element->next_element_in_pre_order())
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;
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m_frame.active_document()->set_focused_element(element);
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return element;
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}
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bool EventHandler::focus_previous_element()
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{
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// FIXME: Implement Shift-Tab cycling backwards through focusable elements!
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return false;
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}
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constexpr bool should_ignore_keydown_event(u32 code_point)
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{
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// FIXME: There are probably also keys with non-zero code points that should be filtered out.
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return code_point == 0;
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}
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bool EventHandler::handle_keydown(KeyCode key, unsigned modifiers, u32 code_point)
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{
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if (key == KeyCode::Key_Tab) {
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if (modifiers & KeyModifier::Mod_Shift)
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return focus_previous_element();
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else
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return focus_next_element();
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}
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if (!layout_root())
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return false;
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if (layout_root()->selection().is_valid()) {
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auto range = layout_root()->selection().to_dom_range()->normalized();
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if (range->start_container()->is_editable()) {
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m_frame.active_document()->layout_node()->set_selection({});
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// FIXME: This doesn't work for some reason?
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m_frame.set_cursor_position({ *range->start_container(), range->start_offset() });
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if (key == KeyCode::Key_Backspace || key == KeyCode::Key_Delete) {
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m_edit_event_handler->handle_delete(range);
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return true;
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} else if (!should_ignore_keydown_event(code_point)) {
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m_edit_event_handler->handle_delete(range);
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m_edit_event_handler->handle_insert(m_frame.cursor_position(), code_point);
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m_frame.increment_cursor_position_offset();
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return true;
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}
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}
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}
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if (m_frame.cursor_position().is_valid() && m_frame.cursor_position().node()->is_editable()) {
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if (key == KeyCode::Key_Backspace) {
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if (!m_frame.decrement_cursor_position_offset()) {
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// FIXME: Move to the previous node and delete the last character there.
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return true;
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}
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m_edit_event_handler->handle_delete_character_after(m_frame.cursor_position());
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return true;
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} else if (key == KeyCode::Key_Delete) {
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if (m_frame.cursor_position().offset_is_at_end_of_node()) {
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// FIXME: Move to the next node and delete the first character there.
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return true;
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}
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m_edit_event_handler->handle_delete_character_after(m_frame.cursor_position());
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return true;
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} else if (key == KeyCode::Key_Right) {
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if (!m_frame.increment_cursor_position_offset()) {
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// FIXME: Move to the next node.
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}
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return true;
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} else if (key == KeyCode::Key_Left) {
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if (!m_frame.decrement_cursor_position_offset()) {
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// FIXME: Move to the previous node.
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}
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return true;
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} else if (!should_ignore_keydown_event(code_point)) {
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m_edit_event_handler->handle_insert(m_frame.cursor_position(), code_point);
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m_frame.increment_cursor_position_offset();
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return true;
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} else {
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// NOTE: Because modifier keys should be ignored, we need to return true.
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return true;
|
|
}
|
|
}
|
|
|
|
auto event = UIEvents::KeyboardEvent::create_from_platform_event(UIEvents::EventNames::keydown, key, modifiers, code_point);
|
|
if (m_frame.active_document()->focused_element())
|
|
return m_frame.active_document()->focused_element()->dispatch_event(move(event));
|
|
else if (m_frame.active_document()->body())
|
|
return m_frame.active_document()->body()->dispatch_event(move(event));
|
|
else
|
|
return m_frame.active_document()->root().dispatch_event(move(event));
|
|
}
|
|
|
|
bool EventHandler::handle_keyup(KeyCode key, unsigned modifiers, u32 code_point)
|
|
{
|
|
auto event = UIEvents::KeyboardEvent::create_from_platform_event(UIEvents::EventNames::keyup, key, modifiers, code_point);
|
|
if (m_frame.active_document()->focused_element())
|
|
return m_frame.active_document()->focused_element()->dispatch_event(move(event));
|
|
else if (m_frame.active_document()->body())
|
|
return m_frame.active_document()->body()->dispatch_event(move(event));
|
|
else
|
|
return m_frame.active_document()->root().dispatch_event(move(event));
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
}
|