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// Copyright 2016 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 "third_party/blink/renderer/core/input/event_handling_util.h"
#include "third_party/blink/public/platform/web_mouse_event.h"
#include "third_party/blink/renderer/core/frame/local_frame.h"
#include "third_party/blink/renderer/core/frame/local_frame_view.h"
#include "third_party/blink/renderer/core/layout/layout_embedded_content.h"
#include "third_party/blink/renderer/core/layout/layout_view.h"
#include "third_party/blink/renderer/core/paint/paint_layer.h"
#include "third_party/blink/renderer/core/paint/paint_layer_scrollable_area.h"
#include "third_party/blink/renderer/core/scroll/scrollable_area.h"
namespace blink {
namespace event_handling_util {
HitTestResult HitTestResultInFrame(
LocalFrame* frame,
const HitTestLocation& location,
HitTestRequest::HitTestRequestType hit_type) {
DCHECK(!location.IsRectBasedTest());
HitTestResult result(HitTestRequest(hit_type), location);
if (!frame || !frame->ContentLayoutObject())
return result;
if (LocalFrameView* frame_view = frame->View()) {
LayoutRect rect(LayoutPoint(), LayoutSize(frame_view->Size()));
if (!location.Intersects(rect))
return result;
}
frame->ContentLayoutObject()->HitTest(location, result);
return result;
}
WebInputEventResult MergeEventResult(WebInputEventResult result_a,
WebInputEventResult result_b) {
// The ordering of the enumeration is specific. There are times that
// multiple events fire and we need to combine them into a single
// result code. The enumeration is based on the level of consumption that
// is most significant. The enumeration is ordered with smaller specified
// numbers first. Examples of merged results are:
// (HandledApplication, HandledSystem) -> HandledSystem
// (NotHandled, HandledApplication) -> HandledApplication
static_assert(static_cast<int>(WebInputEventResult::kNotHandled) == 0,
"WebInputEventResult not ordered");
static_assert(static_cast<int>(WebInputEventResult::kHandledSuppressed) <
static_cast<int>(WebInputEventResult::kHandledApplication),
"WebInputEventResult not ordered");
static_assert(static_cast<int>(WebInputEventResult::kHandledApplication) <
static_cast<int>(WebInputEventResult::kHandledSystem),
"WebInputEventResult not ordered");
return static_cast<WebInputEventResult>(
max(static_cast<int>(result_a), static_cast<int>(result_b)));
}
WebInputEventResult ToWebInputEventResult(DispatchEventResult result) {
switch (result) {
case DispatchEventResult::kNotCanceled:
return WebInputEventResult::kNotHandled;
case DispatchEventResult::kCanceledByEventHandler:
return WebInputEventResult::kHandledApplication;
case DispatchEventResult::kCanceledByDefaultEventHandler:
return WebInputEventResult::kHandledSystem;
case DispatchEventResult::kCanceledBeforeDispatch:
return WebInputEventResult::kHandledSuppressed;
default:
NOTREACHED();
return WebInputEventResult::kHandledSystem;
}
}
PaintLayer* LayerForNode(Node* node) {
if (!node)
return nullptr;
LayoutObject* layout_object = node->GetLayoutObject();
if (!layout_object)
return nullptr;
PaintLayer* layer = layout_object->EnclosingLayer();
if (!layer)
return nullptr;
return layer;
}
bool IsInDocument(EventTarget* n) {
return n && n->ToNode() && n->ToNode()->isConnected();
}
ScrollableArea* AssociatedScrollableArea(const PaintLayer* layer) {
if (PaintLayerScrollableArea* scrollable_area = layer->GetScrollableArea()) {
if (scrollable_area->ScrollsOverflow())
return scrollable_area;
}
return nullptr;
}
ContainerNode* ParentForClickEvent(const Node& node) {
// IE doesn't dispatch click events for mousedown/mouseup events across form
// controls.
if (node.IsHTMLElement() && ToHTMLElement(node).IsInteractiveContent())
return nullptr;
return FlatTreeTraversal::Parent(node);
}
LayoutPoint ContentPointFromRootFrame(LocalFrame* frame,
const FloatPoint& point_in_root_frame) {
LocalFrameView* view = frame->View();
// FIXME: Is it really OK to use the wrong coordinates here when view is 0?
// Historically the code would just crash; this is clearly no worse than that.
return LayoutPoint(view ? view->ConvertFromRootFrame(point_in_root_frame)
: point_in_root_frame);
}
MouseEventWithHitTestResults PerformMouseEventHitTest(
LocalFrame* frame,
const HitTestRequest& request,
const WebMouseEvent& mev) {
DCHECK(frame);
DCHECK(frame->GetDocument());
return frame->GetDocument()->PerformMouseEventHitTest(
request, ContentPointFromRootFrame(frame, mev.PositionInRootFrame()),
mev);
}
LocalFrame* SubframeForTargetNode(Node* node, bool* is_remote_frame) {
if (!node)
return nullptr;
LayoutObject* layout_object = node->GetLayoutObject();
if (!layout_object || !layout_object->IsLayoutEmbeddedContent())
return nullptr;
FrameView* frame_view =
ToLayoutEmbeddedContent(layout_object)->ChildFrameView();
if (!frame_view)
return nullptr;
if (!frame_view->IsLocalFrameView()) {
if (is_remote_frame)
*is_remote_frame = true;
return nullptr;
}
return &ToLocalFrameView(frame_view)->GetFrame();
}
LocalFrame* GetTargetSubframe(
const MouseEventWithHitTestResults& hit_test_result,
Node* capturing_node,
bool* is_remote_frame) {
if (capturing_node) {
return event_handling_util::SubframeForTargetNode(capturing_node,
is_remote_frame);
}
if (!hit_test_result.IsOverEmbeddedContentView())
return nullptr;
return SubframeForTargetNode(hit_test_result.InnerNode(), is_remote_frame);
}
} // namespace event_handling_util
} // namespace blink
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