Add basic PointerEvent support in NewEventHandler

sky/engine/core/frame/NewEventHandler.cpp

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "sky/engine/config.h"
+#include "sky/engine/core/frame/NewEventHandler.h"
+
+#include "sky/engine/core/dom/Document.h"
+#include "sky/engine/core/dom/NodeRenderingTraversal.h"
+#include "sky/engine/core/dom/TouchList.h"
+#include "sky/engine/core/editing/Editor.h"
+#include "sky/engine/core/editing/FrameSelection.h"
+#include "sky/engine/core/editing/htmlediting.h"
+#include "sky/engine/core/events/PointerEvent.h"
+#include "sky/engine/core/frame/LocalFrame.h"
+#include "sky/engine/core/frame/FrameView.h"
+#include "sky/engine/core/page/EventWithHitTestResults.h"
+#include "sky/engine/core/rendering/RenderObject.h"
+#include "sky/engine/core/rendering/RenderView.h"
+#include "sky/engine/platform/geometry/FloatPoint.h"
+#include "sky/engine/public/platform/WebInputEvent.h"
+
+namespace blink {
+
+static VisiblePosition visiblePositionForHitTestResult(const HitTestResult& hitTestResult)
+{
+    Node* innerNode = hitTestResult.innerNode();
+    VisiblePosition position(innerNode->renderer()->positionForPoint(hitTestResult.localPoint()));
+    if (!position.isNull())
+        return position;
+    return VisiblePosition(firstPositionInOrBeforeNode(innerNode), DOWNSTREAM);
+}
+
+static LayoutPoint positionForEvent(const WebPointerEvent& event)
+{
+    return roundedLayoutPoint(FloatPoint(event.x, event.y));
+}
+
+NewEventHandler::NewEventHandler(LocalFrame& frame)
+    : m_frame(frame)
+{
+}
+
+NewEventHandler::~NewEventHandler()
+{
+}
+
+Node* NewEventHandler::targetForHitTestResult(const HitTestResult& hitTestResult)
+{
+    Node* node = hitTestResult.innerNode();
+    if (!node)
+        return m_frame.document();
+    if (node->isTextNode())
+        return NodeRenderingTraversal::parent(node);
+    return node;
+}
+
+HitTestResult NewEventHandler::performHitTest(const LayoutPoint& point)
+{
+    HitTestResult result(point);
+    if (!m_frame.contentRenderer())
+        return result;
+    m_frame.contentRenderer()->hitTest(HitTestRequest(HitTestRequest::ReadOnly), result);
+    return result;
+}
+
+bool NewEventHandler::dispatchPointerEvent(Node& target, const WebPointerEvent& event)
+{
+    RefPtr<PointerEvent> pointerEvent = PointerEvent::create(event);
+    // TODO(abarth): Keep track of how many pointers are targeting the same node
+    // and only mark the first one as primary.
+    return target.dispatchEvent(pointerEvent.release());
+}
+
+bool NewEventHandler::dispatchClickEvent(Node& capturingTarget, const WebPointerEvent& event)
+{
+    ASSERT(event.type == WebInputEvent::PointerUp);
+    HitTestResult hitTestResult = performHitTest(positionForEvent(event));
+    Node* releaseTarget = targetForHitTestResult(hitTestResult);
+    Node* clickTarget = NodeRenderingTraversal::commonAncestor(*releaseTarget, capturingTarget);
+    if (!clickTarget)
+        return true;
+    // TODO(abarth): Make a proper gesture event that includes information from the event.
+    return clickTarget->dispatchEvent(Event::createCancelableBubble(EventTypeNames::click));
+}
+
+void NewEventHandler::updateSelectionForPointerDown(const HitTestResult& hitTestResult, const WebPointerEvent& event)
+{
+    Node* innerNode = hitTestResult.innerNode();
+    if (!innerNode->renderer())
+        return;
+    if (Position::nodeIsUserSelectNone(innerNode))
+        return;
+    if (!innerNode->dispatchEvent(Event::createCancelableBubble(EventTypeNames::selectstart)))
+        return;
+    VisiblePosition position = visiblePositionForHitTestResult(hitTestResult);
+    // TODO(abarth): Can we change this to setSelectionIfNeeded?
+    m_frame.selection().setNonDirectionalSelectionIfNeeded(VisibleSelection(position), CharacterGranularity);
+}
+
+bool NewEventHandler::handlePointerEvent(const WebPointerEvent& event)
+{
+    if (event.type == WebInputEvent::PointerDown)
+        return handlePointerDownEvent(event);
+    if (event.type == WebInputEvent::PointerUp)
+        return handlePointerUpEvent(event);
+    if (event.type == WebInputEvent::PointerMove)
+        return handlePointerMoveEvent(event);
+    ASSERT(event.type == WebInputEvent::PointerCancel);
+    return handlePointerCancelEvent(event);
+}
+
+bool NewEventHandler::handlePointerDownEvent(const WebPointerEvent& event)
+{
+    ASSERT(!m_targetForPointer.contains(event.pointer));
+    HitTestResult hitTestResult = performHitTest(positionForEvent(event));
+    RefPtr<Node> target = targetForHitTestResult(hitTestResult);
+    m_targetForPointer.set(event.pointer, target);
+    bool eventSwallowed = !dispatchPointerEvent(*target, event);
+    // TODO(abarth): Set the target for the pointer to something determined when
+    // dispatching the event.
+    updateSelectionForPointerDown(hitTestResult, event);
+    return eventSwallowed;
+}
+
+bool NewEventHandler::handlePointerUpEvent(const WebPointerEvent& event)
+{
+    RefPtr<Node> target = m_targetForPointer.take(event.pointer);
+    if (!target)
+        return false;
+    bool eventSwallowed = !dispatchPointerEvent(*target, event);
+    // When the user releases the primary pointer, we need to dispatch a tap
+    // event to the common ancestor for where the pointer went down and where
+    // it came up.
+    if (!dispatchClickEvent(*target, event))
+        eventSwallowed = true;
+    return eventSwallowed;
+}
+
+bool NewEventHandler::handlePointerMoveEvent(const WebPointerEvent& event)
+{
+    RefPtr<Node> target = m_targetForPointer.get(event.pointer);
+    return target && dispatchPointerEvent(*target.get(), event);
+}
+
+bool NewEventHandler::handlePointerCancelEvent(const WebPointerEvent& event)
+{
+    RefPtr<Node> target = m_targetForPointer.take(event.pointer);
+    return target && dispatchPointerEvent(*target, event);
+}
+
+}