LibWeb: Move the Page/Frame/EventHandler classes into Page/

1 files changed, 230 insertions, 0 deletions

diff --git a/Libraries/LibWeb/Page/EventHandler.cpp b/Libraries/LibWeb/Page/EventHandler.cpp
new file mode 100644
index 0000000000..0bb63b83b4
--- /dev/null
+++ b/Libraries/LibWeb/Page/EventHandler.cpp
@@ -0,0 +1,230 @@
+/*
+ * 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/HTML/HTMLAnchorElement.h>
+#include <LibWeb/HTML/HTMLIFrameElement.h>
+#include <LibWeb/Layout/LayoutDocument.h>
+#include <LibWeb/Page/EventHandler.h>
+#include <LibWeb/Page/Frame.h>
+#include <LibWeb/PageView.h>
+#include <LibWeb/UIEvents/MouseEvent.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 m_frame.document()->layout_node();
+}
+
+LayoutDocument* 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;
+    bool handled_event = false;
+
+    auto result = layout_root()->hit_test(position);
+    if (result.layout_node && result.layout_node->node()) {
+        RefPtr<DOM::Node> node = result.layout_node->node();
+        if (is<HTML::HTMLIFrameElement>(*node)) {
+            if (auto* subframe = downcast<HTML::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(UIEvents::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)
+{
+    if (!layout_root())
+        return false;
+    NonnullRefPtr 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<DOM::Node> node = result.layout_node->node();
+    document->set_hovered_node(node);
+    if (!node)
+        return false;
+
+    if (is<HTML::HTMLIFrameElement>(*node)) {
+        if (auto* subframe = downcast<HTML::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(UIEvents::MouseEvent::create("mousedown", offset.x(), offset.y()));
+    if (!layout_root())
+        return true;
+
+    if (RefPtr<HTML::HTMLAnchorElement> link = node->enclosing_link_element()) {
+        auto href = link->href();
+        auto url = document->complete_url(href);
+        dbg() << "Web::EventHandler: Clicking on a link to " << url;
+        if (button == GUI::MouseButton::Left) {
+            auto href = link->href();
+            auto url = document->complete_url(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(url, link->target(), modifiers);
+                } else {
+                    // FIXME: Handle different targets!
+                    m_frame.loader().load(url, FrameLoader::Type::Navigation);
+                }
+            }
+        } else if (button == GUI::MouseButton::Right) {
+            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) {
+            page_client.page_did_middle_click_link(url, 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)
+{
+    if (!layout_root())
+        return false;
+    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 HTML::HTMLAnchorElement* hovered_link_element = nullptr;
+    if (result.layout_node) {
+        RefPtr<DOM::Node> node = result.layout_node->node();
+
+        if (node && is<HTML::HTMLIFrameElement>(*node)) {
+            if (auto* subframe = downcast<HTML::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(UIEvents::MouseEvent::create("mousemove", offset.x(), offset.y()));
+            if (!layout_root())
+                return true;
+        }
+        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<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;
+}
+
+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
+}
+
+}