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chromium / chromium / src / fde0e4e7498387fecebbccb1939a3ad3ece0d4ba / . / third_party / blink / renderer / core / input / event_handler.cc
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/*
* Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights
* reserved.
* Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
* Copyright (C) 2012 Digia Plc. and/or its subsidiary(-ies)
*
* 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 APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. 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 "third_party/blink/renderer/core/input/event_handler.h"
#include <memory>
#include <utility>
#include "build/build_config.h"
#include "third_party/blink/public/platform/task_type.h"
#include "third_party/blink/public/platform/web_input_event.h"
#include "third_party/blink/public/platform/web_mouse_wheel_event.h"
#include "third_party/blink/renderer/core/clipboard/data_transfer.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/dom/dom_node_ids.h"
#include "third_party/blink/renderer/core/dom/events/event_path.h"
#include "third_party/blink/renderer/core/dom/flat_tree_traversal.h"
#include "third_party/blink/renderer/core/dom/shadow_root.h"
#include "third_party/blink/renderer/core/dom/user_gesture_indicator.h"
#include "third_party/blink/renderer/core/editing/editing_utilities.h"
#include "third_party/blink/renderer/core/editing/editor.h"
#include "third_party/blink/renderer/core/editing/ephemeral_range.h"
#include "third_party/blink/renderer/core/editing/frame_selection.h"
#include "third_party/blink/renderer/core/editing/selection_controller.h"
#include "third_party/blink/renderer/core/events/gesture_event.h"
#include "third_party/blink/renderer/core/events/keyboard_event.h"
#include "third_party/blink/renderer/core/events/mouse_event.h"
#include "third_party/blink/renderer/core/events/pointer_event.h"
#include "third_party/blink/renderer/core/events/text_event.h"
#include "third_party/blink/renderer/core/events/touch_event.h"
#include "third_party/blink/renderer/core/frame/deprecation.h"
#include "third_party/blink/renderer/core/frame/event_handler_registry.h"
#include "third_party/blink/renderer/core/frame/local_frame.h"
#include "third_party/blink/renderer/core/frame/local_frame_client.h"
#include "third_party/blink/renderer/core/frame/local_frame_view.h"
#include "third_party/blink/renderer/core/frame/settings.h"
#include "third_party/blink/renderer/core/frame/use_counter.h"
#include "third_party/blink/renderer/core/frame/visual_viewport.h"
#include "third_party/blink/renderer/core/html/forms/html_input_element.h"
#include "third_party/blink/renderer/core/html/html_dialog_element.h"
#include "third_party/blink/renderer/core/html/html_frame_element_base.h"
#include "third_party/blink/renderer/core/html/html_frame_set_element.h"
#include "third_party/blink/renderer/core/input/event_handling_util.h"
#include "third_party/blink/renderer/core/input/input_device_capabilities.h"
#include "third_party/blink/renderer/core/input/touch_action_util.h"
#include "third_party/blink/renderer/core/input/touch_list.h"
#include "third_party/blink/renderer/core/input_type_names.h"
#include "third_party/blink/renderer/core/layout/hit_test_request.h"
#include "third_party/blink/renderer/core/layout/hit_test_result.h"
#include "third_party/blink/renderer/core/layout/layout_view.h"
#include "third_party/blink/renderer/core/loader/document_loader.h"
#include "third_party/blink/renderer/core/loader/frame_loader.h"
#include "third_party/blink/renderer/core/loader/resource/image_resource_content.h"
#include "third_party/blink/renderer/core/page/autoscroll_controller.h"
#include "third_party/blink/renderer/core/page/chrome_client.h"
#include "third_party/blink/renderer/core/page/drag_state.h"
#include "third_party/blink/renderer/core/page/focus_controller.h"
#include "third_party/blink/renderer/core/page/frame_tree.h"
#include "third_party/blink/renderer/core/page/page.h"
#include "third_party/blink/renderer/core/page/scrolling/scroll_state.h"
#include "third_party/blink/renderer/core/page/touch_adjustment.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/scroll_animator_base.h"
#include "third_party/blink/renderer/core/scroll/scrollbar.h"
#include "third_party/blink/renderer/core/style/computed_style.h"
#include "third_party/blink/renderer/core/style/cursor_data.h"
#include "third_party/blink/renderer/platform/bindings/exception_state.h"
#include "third_party/blink/renderer/platform/geometry/float_point.h"
#include "third_party/blink/renderer/platform/graphics/image.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
#include "third_party/blink/renderer/platform/histogram.h"
#include "third_party/blink/renderer/platform/instrumentation/tracing/trace_event.h"
#include "third_party/blink/renderer/platform/runtime_enabled_features.h"
#include "third_party/blink/renderer/platform/windows_keyboard_codes.h"
#include "third_party/blink/renderer/platform/wtf/assertions.h"
#include "third_party/blink/renderer/platform/wtf/std_lib_extras.h"
#include "third_party/blink/renderer/platform/wtf/time.h"
namespace blink {
namespace {
// Refetch the event target node if it is removed or currently is the shadow
// node inside an <input> element. If a mouse event handler changes the input
// element type to one that has a EmbeddedContentView associated, we'd like to
// EventHandler::handleMousePressEvent to pass the event to the
// EmbeddedContentView and thus the event target node can't still be the shadow
// node.
bool ShouldRefetchEventTarget(const MouseEventWithHitTestResults& mev) {
Node* target_node = mev.InnerNode();
if (!target_node || !target_node->parentNode())
return true;
return target_node->IsShadowRoot() &&
IsHTMLInputElement(ToShadowRoot(target_node)->host());
}
} // namespace
// The amount of time to wait for a cursor update on style and layout changes
// Set to 50Hz, no need to be faster than common screen refresh rate
static constexpr TimeDelta kCursorUpdateInterval =
TimeDelta::FromMilliseconds(20);
static const int kMaximumCursorSize = 128;
// It's pretty unlikely that a scale of less than one would ever be used. But
// all we really need to ensure here is that the scale isn't so small that
// integer overflow can occur when dividing cursor sizes (limited above) by the
// scale.
static const double kMinimumCursorScale = 0.001;
// The minimum amount of time an element stays active after a ShowPress
// This is roughly 9 frames, which should be long enough to be noticeable.
constexpr TimeDelta kMinimumActiveInterval = TimeDelta::FromSecondsD(0.15);
EventHandler::EventHandler(LocalFrame& frame)
: frame_(frame),
selection_controller_(SelectionController::Create(frame)),
hover_timer_(frame.GetTaskRunner(TaskType::kUserInteraction),
this,
&EventHandler::HoverTimerFired),
cursor_update_timer_(
frame.GetTaskRunner(TaskType::kInternalUserInteraction),
this,
&EventHandler::CursorUpdateTimerFired),
event_handler_will_reset_capturing_mouse_events_node_(0),
should_only_fire_drag_over_event_(false),
event_handler_registry_(
frame_->IsLocalRoot()
? MakeGarbageCollected<EventHandlerRegistry>(*frame_)
: &frame_->LocalFrameRoot().GetEventHandlerRegistry()),
scroll_manager_(new ScrollManager(frame)),
mouse_event_manager_(new MouseEventManager(frame, *scroll_manager_)),
mouse_wheel_event_manager_(new MouseWheelEventManager(frame)),
keyboard_event_manager_(
MakeGarbageCollected<KeyboardEventManager>(frame, *scroll_manager_)),
pointer_event_manager_(
new PointerEventManager(frame, *mouse_event_manager_)),
gesture_manager_(
MakeGarbageCollected<GestureManager>(frame,
*scroll_manager_,
*mouse_event_manager_,
*pointer_event_manager_,
*selection_controller_)),
active_interval_timer_(frame.GetTaskRunner(TaskType::kUserInteraction),
this,
&EventHandler::ActiveIntervalTimerFired) {}
void EventHandler::Trace(blink::Visitor* visitor) {
visitor->Trace(frame_);
visitor->Trace(selection_controller_);
visitor->Trace(capturing_mouse_events_node_);
visitor->Trace(last_mouse_move_event_subframe_);
visitor->Trace(last_scrollbar_under_mouse_);
visitor->Trace(drag_target_);
visitor->Trace(frame_set_being_resized_);
visitor->Trace(event_handler_registry_);
visitor->Trace(scroll_manager_);
visitor->Trace(mouse_event_manager_);
visitor->Trace(mouse_wheel_event_manager_);
visitor->Trace(keyboard_event_manager_);
visitor->Trace(pointer_event_manager_);
visitor->Trace(gesture_manager_);
visitor->Trace(last_deferred_tap_element_);
}
void EventHandler::Clear() {
hover_timer_.Stop();
cursor_update_timer_.Stop();
active_interval_timer_.Stop();
last_mouse_move_event_subframe_ = nullptr;
last_scrollbar_under_mouse_ = nullptr;
frame_set_being_resized_ = nullptr;
drag_target_ = nullptr;
should_only_fire_drag_over_event_ = false;
last_mouse_down_user_gesture_token_ = nullptr;
capturing_mouse_events_node_ = nullptr;
pointer_event_manager_->Clear();
scroll_manager_->Clear();
gesture_manager_->Clear();
mouse_event_manager_->Clear();
mouse_wheel_event_manager_->Clear();
last_show_press_timestamp_.reset();
last_deferred_tap_element_ = nullptr;
event_handler_will_reset_capturing_mouse_events_node_ = false;
should_use_touch_event_adjusted_point_ = false;
touch_adjustment_result_.unique_event_id = 0;
}
void EventHandler::UpdateSelectionForMouseDrag() {
mouse_event_manager_->UpdateSelectionForMouseDrag();
}
void EventHandler::StartMiddleClickAutoscroll(LayoutObject* layout_object) {
DCHECK(RuntimeEnabledFeatures::MiddleClickAutoscrollEnabled());
if (!layout_object->IsBox())
return;
AutoscrollController* controller = scroll_manager_->GetAutoscrollController();
if (!controller)
return;
controller->StartMiddleClickAutoscroll(
layout_object->GetFrame(),
frame_->GetPage()->GetVisualViewport().ViewportToRootFrame(
FloatPoint(mouse_event_manager_->LastKnownMousePosition())),
mouse_event_manager_->LastKnownMousePositionGlobal());
mouse_event_manager_->InvalidateClick();
}
void EventHandler::PerformHitTest(const HitTestLocation& location,
HitTestResult& result,
bool no_lifecycle_update) const {
// LayoutView::hitTest causes a layout, and we don't want to hit that until
// the first layout because until then, there is nothing shown on the screen -
// the user can't have intentionally clicked on something belonging to this
// page. Furthermore, mousemove events before the first layout should not
// lead to a premature layout() happening, which could show a flash of white.
// See also the similar code in Document::performMouseEventHitTest.
// The check to LifecycleUpdatesActive() prevents hit testing to frames
// that have already had layout but are throttled to prevent painting
// because the current Document isn't ready to render yet. In that case
// the lifecycle update prompted by HitTest() would fail.
if (!frame_->ContentLayoutObject() || !frame_->View() ||
!frame_->View()->DidFirstLayout() ||
!frame_->View()->LifecycleUpdatesActive())
return;
if (no_lifecycle_update) {
frame_->ContentLayoutObject()->HitTestNoLifecycleUpdate(location, result);
} else {
frame_->ContentLayoutObject()->HitTest(location, result);
}
const HitTestRequest& request = result.GetHitTestRequest();
if (!request.ReadOnly()) {
frame_->GetDocument()->UpdateHoverActiveState(request,
result.InnerElement());
}
}
HitTestResult EventHandler::HitTestResultAtLocation(
const HitTestLocation& location,
HitTestRequest::HitTestRequestType hit_type,
const LayoutObject* stop_node,
bool no_lifecycle_update) {
TRACE_EVENT0("blink", "EventHandler::HitTestResultAtLocation");
// We always send HitTestResultAtLocation to the main frame if we have one,
// otherwise we might hit areas that are obscured by higher frames.
if (frame_->GetPage()) {
LocalFrame& main_frame = frame_->LocalFrameRoot();
if (frame_ != &main_frame) {
LocalFrameView* frame_view = frame_->View();
LocalFrameView* main_view = main_frame.View();
if (frame_view && main_view) {
if (location.IsRectBasedTest()) {
DCHECK(location.IsRectilinear());
LayoutPoint main_content_point =
main_view->ConvertFromRootFrame(frame_view->ConvertToRootFrame(
location.BoundingBox().Location()));
HitTestLocation adjusted_location(
(LayoutRect(main_content_point, location.BoundingBox().Size())));
return main_frame.GetEventHandler().HitTestResultAtLocation(
adjusted_location, hit_type, stop_node, no_lifecycle_update);
} else {
HitTestLocation adjusted_location(main_view->ConvertFromRootFrame(
frame_view->ConvertToRootFrame(location.Point())));
return main_frame.GetEventHandler().HitTestResultAtLocation(
adjusted_location, hit_type, stop_node, no_lifecycle_update);
}
}
}
}
// HitTestResultAtLocation is specifically used to hitTest into all frames,
// thus it always allows child frame content.
HitTestRequest request(hit_type | HitTestRequest::kAllowChildFrameContent,
stop_node);
HitTestResult result(request, location);
PerformHitTest(location, result, no_lifecycle_update);
return result;
}
void EventHandler::StopAutoscroll() {
scroll_manager_->StopMiddleClickAutoscroll();
scroll_manager_->StopAutoscroll();
}
// TODO(bokan): This should be merged with logicalScroll assuming
// defaultSpaceEventHandler's chaining scroll can be done crossing frames.
bool EventHandler::BubblingScroll(ScrollDirection direction,
ScrollGranularity granularity,
Node* starting_node) {
return scroll_manager_->BubblingScroll(
direction, granularity, starting_node,
mouse_event_manager_->MousePressNode());
}
IntPoint EventHandler::LastKnownMousePositionInRootFrame() const {
return frame_->GetPage()->GetVisualViewport().ViewportToRootFrame(
mouse_event_manager_->LastKnownMousePosition());
}
IntPoint EventHandler::DragDataTransferLocationForTesting() {
if (mouse_event_manager_->GetDragState().drag_data_transfer_)
return mouse_event_manager_->GetDragState()
.drag_data_transfer_->DragLocation();
return IntPoint();
}
static bool IsSubmitImage(Node* node) {
return IsHTMLInputElement(node) &&
ToHTMLInputElement(node)->type() == input_type_names::kImage;
}
bool EventHandler::UseHandCursor(Node* node, bool is_over_link) {
if (!node)
return false;
return ((is_over_link || IsSubmitImage(node)) && !HasEditableStyle(*node));
}
void EventHandler::CursorUpdateTimerFired(TimerBase*) {
DCHECK(frame_);
DCHECK(frame_->GetDocument());
UpdateCursor();
}
void EventHandler::UpdateCursor() {
TRACE_EVENT0("input", "EventHandler::updateCursor");
// We must do a cross-frame hit test because the frame that triggered the
// cursor update could be occluded by a different frame.
DCHECK_EQ(frame_, &frame_->LocalFrameRoot());
LocalFrameView* view = frame_->View();
if (!view || !view->ShouldSetCursor())
return;
auto* layout_view = view->GetLayoutView();
if (!layout_view)
return;
frame_->GetDocument()->UpdateStyleAndLayout();
HitTestRequest request(HitTestRequest::kReadOnly |
HitTestRequest::kAllowChildFrameContent);
HitTestLocation location(
view->ViewportToFrame(mouse_event_manager_->LastKnownMousePosition()));
HitTestResult result(request, location);
layout_view->HitTest(location, result);
if (LocalFrame* frame = result.InnerNodeFrame()) {
EventHandler::OptionalCursor optional_cursor =
frame->GetEventHandler().SelectCursor(location, result);
if (optional_cursor.IsCursorChange()) {
view->SetCursor(optional_cursor.GetCursor());
}
}
}
bool EventHandler::ShouldShowResizeForNode(const Node* node,
const HitTestLocation& location) {
if (LayoutObject* layout_object = node->GetLayoutObject()) {
PaintLayer* layer = layout_object->EnclosingLayer();
if (layer->GetScrollableArea() &&
layer->GetScrollableArea()->IsPointInResizeControl(
RoundedIntPoint(location.Point()), kResizerForPointer)) {
return true;
}
}
return false;
}
bool EventHandler::IsSelectingLink(const HitTestResult& result) {
// If a drag may be starting or we're capturing mouse events for a particular
// node, don't treat this as a selection. Note calling
// ComputeVisibleSelectionInDOMTreeDeprecated may update layout.
const bool mouse_selection =
!capturing_mouse_events_node_ &&
mouse_event_manager_->MousePressed() &&
GetSelectionController().MouseDownMayStartSelect() &&
!mouse_event_manager_->MouseDownMayStartDrag() &&
!frame_->Selection()
.ComputeVisibleSelectionInDOMTreeDeprecated()
.IsNone();
return mouse_selection && result.IsOverLink();
}
bool EventHandler::ShouldShowIBeamForNode(const Node* node,
const HitTestResult& result) {
if (!node)
return false;
if (node->IsTextNode() && (node->CanStartSelection() || result.IsOverLink()))
return true;
return HasEditableStyle(*node);
}
EventHandler::OptionalCursor EventHandler::SelectCursor(
const HitTestLocation& location,
const HitTestResult& result) {
if (scroll_manager_->InResizeMode())
return kNoCursorChange;
Page* page = frame_->GetPage();
if (!page)
return kNoCursorChange;
if (scroll_manager_->MiddleClickAutoscrollInProgress())
return kNoCursorChange;
if (result.GetScrollbar() && !result.GetScrollbar()->IsCustomScrollbar())
return PointerCursor();
Node* node = result.InnerPossiblyPseudoNode();
if (!node)
return SelectAutoCursor(result, node, IBeamCursor());
if (ShouldShowResizeForNode(node, location))
return PointerCursor();
LayoutObject* layout_object = node->GetLayoutObject();
const ComputedStyle* style = layout_object ? layout_object->Style() : nullptr;
if (layout_object) {
Cursor override_cursor;
switch (layout_object->GetCursor(RoundedIntPoint(result.LocalPoint()),
override_cursor)) {
case kSetCursorBasedOnStyle:
break;
case kSetCursor:
return override_cursor;
case kDoNotSetCursor:
return kNoCursorChange;
}
}
if (style && style->Cursors()) {
const CursorList* cursors = style->Cursors();
for (unsigned i = 0; i < cursors->size(); ++i) {
StyleImage* style_image = (*cursors)[i].GetImage();
if (!style_image)
continue;
ImageResourceContent* cached_image = style_image->CachedImage();
if (!cached_image)
continue;
float scale = style_image->ImageScaleFactor();
bool hot_spot_specified = (*cursors)[i].HotSpotSpecified();
// Get hotspot and convert from logical pixels to physical pixels.
IntPoint hot_spot = (*cursors)[i].HotSpot();
hot_spot.Scale(scale, scale);
IntSize size = cached_image->GetImage()->Size();
if (cached_image->ErrorOccurred())
continue;
// Limit the size of cursors (in UI pixels) so that they cannot be
// used to cover UI elements in chrome.
size.Scale(1 / scale);
if (size.Width() > kMaximumCursorSize ||
size.Height() > kMaximumCursorSize)
continue;
Image* image = cached_image->GetImage();
// Ensure no overflow possible in calculations above.
if (scale < kMinimumCursorScale)
continue;
return Cursor(image, hot_spot_specified, hot_spot, scale);
}
}
bool horizontal_text = !style || style->IsHorizontalWritingMode();
const Cursor& i_beam = horizontal_text ? IBeamCursor() : VerticalTextCursor();
switch (style ? style->Cursor() : ECursor::kAuto) {
case ECursor::kAuto: {
return SelectAutoCursor(result, node, i_beam);
}
case ECursor::kCrosshair:
return CrossCursor();
case ECursor::kPointer:
return IsSelectingLink(result) ? i_beam : HandCursor();
case ECursor::kMove:
return MoveCursor();
case ECursor::kAllScroll:
return MoveCursor();
case ECursor::kEResize:
return EastResizeCursor();
case ECursor::kWResize:
return WestResizeCursor();
case ECursor::kNResize:
return NorthResizeCursor();
case ECursor::kSResize:
return SouthResizeCursor();
case ECursor::kNeResize:
return NorthEastResizeCursor();
case ECursor::kSwResize:
return SouthWestResizeCursor();
case ECursor::kNwResize:
return NorthWestResizeCursor();
case ECursor::kSeResize:
return SouthEastResizeCursor();
case ECursor::kNsResize:
return NorthSouthResizeCursor();
case ECursor::kEwResize:
return EastWestResizeCursor();
case ECursor::kNeswResize:
return NorthEastSouthWestResizeCursor();
case ECursor::kNwseResize:
return NorthWestSouthEastResizeCursor();
case ECursor::kColResize:
return ColumnResizeCursor();
case ECursor::kRowResize:
return RowResizeCursor();
case ECursor::kText:
return i_beam;
case ECursor::kWait:
return WaitCursor();
case ECursor::kHelp:
return HelpCursor();
case ECursor::kVerticalText:
return VerticalTextCursor();
case ECursor::kCell:
return CellCursor();
case ECursor::kContextMenu:
return ContextMenuCursor();
case ECursor::kProgress:
return ProgressCursor();
case ECursor::kNoDrop:
return NoDropCursor();
case ECursor::kAlias:
return AliasCursor();
case ECursor::kCopy:
return CopyCursor();
case ECursor::kNone:
return NoneCursor();
case ECursor::kNotAllowed:
return NotAllowedCursor();
case ECursor::kDefault:
return PointerCursor();
case ECursor::kZoomIn:
return ZoomInCursor();
case ECursor::kZoomOut:
return ZoomOutCursor();
case ECursor::kGrab:
return GrabCursor();
case ECursor::kGrabbing:
return GrabbingCursor();
}
return PointerCursor();
}
EventHandler::OptionalCursor EventHandler::SelectAutoCursor(
const HitTestResult& result,
Node* node,
const Cursor& i_beam) {
if (ShouldShowIBeamForNode(node, result))
return i_beam;
return PointerCursor();
}
WebInputEventResult EventHandler::DispatchBufferedTouchEvents() {
return pointer_event_manager_->FlushEvents();
}
WebInputEventResult EventHandler::HandlePointerEvent(
const WebPointerEvent& web_pointer_event,
const Vector<WebPointerEvent>& coalesced_events,
const Vector<WebPointerEvent>& predicted_events) {
return pointer_event_manager_->HandlePointerEvent(
web_pointer_event, coalesced_events, predicted_events);
}
WebInputEventResult EventHandler::HandleMousePressEvent(
const WebMouseEvent& mouse_event) {
TRACE_EVENT0("blink", "EventHandler::handleMousePressEvent");
// For 4th/5th button in the mouse since Chrome does not yet send
// button value to Blink but in some cases it does send the event.
// This check is needed to suppress such an event (crbug.com/574959)
if (mouse_event.button == WebPointerProperties::Button::kNoButton)
return WebInputEventResult::kHandledSuppressed;
if (event_handler_will_reset_capturing_mouse_events_node_)
capturing_mouse_events_node_ = nullptr;
mouse_event_manager_->HandleMousePressEventUpdateStates(mouse_event);
if (!frame_->View())
return WebInputEventResult::kNotHandled;
HitTestRequest request(HitTestRequest::kActive);
// Save the document point we generate in case the window coordinate is
// invalidated by what happens when we dispatch the event.
LayoutPoint document_point = frame_->View()->ConvertFromRootFrame(
FlooredIntPoint(mouse_event.PositionInRootFrame()));
MouseEventWithHitTestResults mev =
frame_->GetDocument()->PerformMouseEventHitTest(request, document_point,
mouse_event);
if (!mev.InnerNode()) {
mouse_event_manager_->InvalidateClick();
return WebInputEventResult::kNotHandled;
}
mouse_event_manager_->SetMousePressNode(mev.InnerNode());
frame_->GetDocument()->SetSequentialFocusNavigationStartingPoint(
mev.InnerNode());
LocalFrame* subframe = event_handling_util::SubframeForHitTestResult(mev);
if (subframe) {
WebInputEventResult result = PassMousePressEventToSubframe(mev, subframe);
// Start capturing future events for this frame. We only do this if we
// didn't clear the m_mousePressed flag, which may happen if an AppKit
// EmbeddedContentView entered a modal event loop. The capturing should be
// done only when the result indicates it has been handled. See
// crbug.com/269917
mouse_event_manager_->SetCapturesDragging(
subframe->GetEventHandler().mouse_event_manager_->CapturesDragging());
if (mouse_event_manager_->MousePressed() &&
mouse_event_manager_->CapturesDragging()) {
capturing_mouse_events_node_ = mev.InnerNode();
event_handler_will_reset_capturing_mouse_events_node_ = true;
}
mouse_event_manager_->InvalidateClick();
return result;
}
std::unique_ptr<UserGestureIndicator> gesture_indicator =
LocalFrame::NotifyUserActivation(frame_);
frame_->LocalFrameRoot()
.GetEventHandler()
.last_mouse_down_user_gesture_token_ =
UserGestureIndicator::CurrentToken();
if (RuntimeEnabledFeatures::MiddleClickAutoscrollEnabled()) {
// We store whether middle click autoscroll is in progress before calling
// stopAutoscroll() because it will set m_autoscrollType to NoAutoscroll on
// return.
bool is_middle_click_autoscroll_in_progress =
scroll_manager_->MiddleClickAutoscrollInProgress();
scroll_manager_->StopMiddleClickAutoscroll();
if (is_middle_click_autoscroll_in_progress) {
// We invalidate the click when exiting middle click auto scroll so that
// we don't inadvertently navigate away from the current page (e.g. the
// click was on a hyperlink). See <rdar://problem/6095023>.
mouse_event_manager_->InvalidateClick();
return WebInputEventResult::kHandledSuppressed;
}
}
mouse_event_manager_->SetClickCount(mouse_event.click_count);
mouse_event_manager_->SetClickElement(mev.InnerElement());
if (!mouse_event.FromTouch())
frame_->Selection().SetCaretBlinkingSuspended(true);
WebInputEventResult event_result = DispatchMousePointerEvent(
WebInputEvent::kPointerDown, mev.InnerNode(), mev.CanvasRegionId(),
mev.Event(), Vector<WebMouseEvent>(), Vector<WebMouseEvent>());
// Disabled form controls still need to resize the scrollable area.
if ((event_result == WebInputEventResult::kNotHandled ||
event_result == WebInputEventResult::kHandledSuppressed) &&
frame_->View()) {
LocalFrameView* view = frame_->View();
PaintLayer* layer =
mev.InnerNode()->GetLayoutObject()
? mev.InnerNode()->GetLayoutObject()->EnclosingLayer()
: nullptr;
IntPoint p = view->ConvertFromRootFrame(
FlooredIntPoint(mouse_event.PositionInRootFrame()));
if (layer && layer->GetScrollableArea() &&
layer->GetScrollableArea()->IsPointInResizeControl(
p, kResizerForPointer)) {
scroll_manager_->SetResizeScrollableArea(layer, p);
return WebInputEventResult::kHandledSystem;
}
}
// m_selectionInitiationState is initialized after dispatching mousedown
// event in order not to keep the selection by DOM APIs because we can't
// give the user the chance to handle the selection by user action like
// dragging if we keep the selection in case of mousedown. FireFox also has
// the same behavior and it's more compatible with other browsers.
GetSelectionController().InitializeSelectionState();
HitTestResult hit_test_result = event_handling_util::HitTestResultInFrame(
frame_, HitTestLocation(document_point), HitTestRequest::kReadOnly);
InputDeviceCapabilities* source_capabilities =
frame_->GetDocument()
->domWindow()
->GetInputDeviceCapabilities()
->FiresTouchEvents(mouse_event.FromTouch());
if (event_result == WebInputEventResult::kNotHandled) {
event_result = mouse_event_manager_->HandleMouseFocus(hit_test_result,
source_capabilities);
}
if (event_result == WebInputEventResult::kNotHandled || mev.GetScrollbar()) {
mouse_event_manager_->SetCapturesDragging(true);
// Main frames don't implicitly capture mouse input on MouseDown, just
// subframes do (regardless of whether local or remote).
if (!frame_->IsMainFrame())
CaptureMouseEventsToWidget(true);
} else {
mouse_event_manager_->SetCapturesDragging(false);
}
// If the hit testing originally determined the event was in a scrollbar,
// refetch the MouseEventWithHitTestResults in case the scrollbar
// EmbeddedContentView was destroyed when the mouse event was handled.
if (mev.GetScrollbar()) {
const bool was_last_scroll_bar =
mev.GetScrollbar() == last_scrollbar_under_mouse_.Get();
HitTestRequest request(HitTestRequest::kReadOnly | HitTestRequest::kActive);
mev = frame_->GetDocument()->PerformMouseEventHitTest(
request, document_point, mouse_event);
if (was_last_scroll_bar &&
mev.GetScrollbar() != last_scrollbar_under_mouse_.Get())
last_scrollbar_under_mouse_ = nullptr;
}
if (event_result != WebInputEventResult::kNotHandled) {
// Scrollbars should get events anyway, even disabled controls might be
// scrollable.
PassMousePressEventToScrollbar(mev);
} else {
if (ShouldRefetchEventTarget(mev)) {
HitTestRequest request(HitTestRequest::kReadOnly |
HitTestRequest::kActive);
mev = frame_->GetDocument()->PerformMouseEventHitTest(
request, document_point, mouse_event);
}
if (PassMousePressEventToScrollbar(mev))
event_result = WebInputEventResult::kHandledSystem;
else
event_result = mouse_event_manager_->HandleMousePressEvent(mev);
}
if (mev.GetHitTestResult().InnerNode() &&
mouse_event.button == WebPointerProperties::Button::kLeft) {
DCHECK_EQ(WebInputEvent::kMouseDown, mouse_event.GetType());
HitTestResult result = mev.GetHitTestResult();
result.SetToShadowHostIfInRestrictedShadowRoot();
frame_->GetChromeClient().OnMouseDown(*result.InnerNode());
}
return event_result;
}
WebInputEventResult EventHandler::HandleMouseMoveEvent(
const WebMouseEvent& event,
const Vector<WebMouseEvent>& coalesced_events,
const Vector<WebMouseEvent>& predicted_events) {
TRACE_EVENT0("blink", "EventHandler::handleMouseMoveEvent");
HitTestResult hovered_node_result;
HitTestLocation location;
WebInputEventResult result =
HandleMouseMoveOrLeaveEvent(event, coalesced_events, predicted_events,
&hovered_node_result, &location);
Page* page = frame_->GetPage();
if (!page)
return result;
if (PaintLayer* layer =
event_handling_util::LayerForNode(hovered_node_result.InnerNode())) {
if (ScrollableArea* layer_scrollable_area =
event_handling_util::AssociatedScrollableArea(layer))
layer_scrollable_area->MouseMovedInContentArea();
}
hovered_node_result.SetToShadowHostIfInRestrictedShadowRoot();
page->GetChromeClient().MouseDidMoveOverElement(*frame_, location,
hovered_node_result);
return result;
}
void EventHandler::HandleMouseLeaveEvent(const WebMouseEvent& event) {
TRACE_EVENT0("blink", "EventHandler::handleMouseLeaveEvent");
Page* page = frame_->GetPage();
if (page)
page->GetChromeClient().ClearToolTip(*frame_);
HandleMouseMoveOrLeaveEvent(event, Vector<WebMouseEvent>(),
Vector<WebMouseEvent>(), nullptr, nullptr, false,
true);
pointer_event_manager_->RemoveLastMousePosition();
}
WebInputEventResult EventHandler::HandleMouseMoveOrLeaveEvent(
const WebMouseEvent& mouse_event,
const Vector<WebMouseEvent>& coalesced_events,
const Vector<WebMouseEvent>& predicted_events,
HitTestResult* hovered_node_result,
HitTestLocation* hit_test_location,
bool only_update_scrollbars,
bool force_leave) {
DCHECK(frame_);
DCHECK(frame_->View());
mouse_event_manager_->SetLastKnownMousePosition(mouse_event);
hover_timer_.Stop();
cursor_update_timer_.Stop();
mouse_event_manager_->CancelFakeMouseMoveEvent();
mouse_event_manager_->HandleSvgPanIfNeeded(false);
// Mouse states need to be reset when mouse move with no button down.
// This is for popup/context_menu opened at mouse_down event and
// mouse_release is not handled in page.
// crbug.com/527582
if (mouse_event.button == WebPointerProperties::Button::kNoButton &&
!(mouse_event.GetModifiers() &
WebInputEvent::Modifiers::kRelativeMotionEvent)) {
mouse_event_manager_->ClearDragHeuristicState();
if (event_handler_will_reset_capturing_mouse_events_node_)
capturing_mouse_events_node_ = nullptr;
CaptureMouseEventsToWidget(false);
}
if (RuntimeEnabledFeatures::MiddleClickAutoscrollEnabled()) {
if (Page* page = frame_->GetPage()) {
if (mouse_event.GetType() == WebInputEvent::kMouseLeave &&
mouse_event.button != WebPointerProperties::Button::kMiddle) {
page->GetAutoscrollController().StopMiddleClickAutoscroll(frame_);
} else {
page->GetAutoscrollController().HandleMouseMoveForMiddleClickAutoscroll(
frame_, mouse_event_manager_->LastKnownMousePositionGlobal(),
mouse_event.button == WebPointerProperties::Button::kMiddle);
}
}
}
if (frame_set_being_resized_) {
return DispatchMousePointerEvent(
WebInputEvent::kPointerMove, frame_set_being_resized_.Get(), String(),
mouse_event, coalesced_events, predicted_events);
}
// Send events right to a scrollbar if the mouse is pressed.
if (last_scrollbar_under_mouse_ && mouse_event_manager_->MousePressed()) {
last_scrollbar_under_mouse_->MouseMoved(mouse_event);
return WebInputEventResult::kHandledSystem;
}
HitTestRequest::HitTestRequestType hit_type = HitTestRequest::kMove;
if (mouse_event_manager_->MousePressed()) {
hit_type |= HitTestRequest::kActive;
} else if (only_update_scrollbars) {
// Mouse events should be treated as "read-only" if we're updating only
// scrollbars. This means that :hover and :active freeze in the state they
// were in, rather than updating for nodes the mouse moves while the
// window is not key (which will be the case if onlyUpdateScrollbars is
// true).
hit_type |= HitTestRequest::kReadOnly;
}
// Treat any mouse move events as readonly if the user is currently touching
// the screen.
if (pointer_event_manager_->IsAnyTouchActive() && !force_leave)
hit_type |= HitTestRequest::kActive | HitTestRequest::kReadOnly;
HitTestRequest request(hit_type);
HitTestLocation out_location((LayoutPoint()));
MouseEventWithHitTestResults mev = MouseEventWithHitTestResults(
mouse_event, out_location, HitTestResult(request, out_location));
// We don't want to do a hit-test in forceLeave scenarios because there
// might actually be some other frame above this one at the specified
// co-ordinate. So we must force the hit-test to fail, while still clearing
// hover/active state.
if (force_leave) {
frame_->GetDocument()->UpdateHoverActiveState(request, nullptr);
} else {
mev = event_handling_util::PerformMouseEventHitTest(frame_, request,
mouse_event);
}
if (hovered_node_result)
*hovered_node_result = mev.GetHitTestResult();
if (hit_test_location)
*hit_test_location = mev.GetHitTestLocation();
Scrollbar* scrollbar = nullptr;
if (scroll_manager_->InResizeMode()) {
scroll_manager_->Resize(mev.Event());
} else {
if (!scrollbar)
scrollbar = mev.GetScrollbar();
UpdateLastScrollbarUnderMouse(scrollbar,
!mouse_event_manager_->MousePressed());
if (only_update_scrollbars)
return WebInputEventResult::kHandledSuppressed;
}
WebInputEventResult event_result = WebInputEventResult::kNotHandled;
LocalFrame* new_subframe =
capturing_mouse_events_node_.Get()
? event_handling_util::SubframeForTargetNode(
capturing_mouse_events_node_.Get())
: event_handling_util::SubframeForHitTestResult(mev);
// We want mouseouts to happen first, from the inside out. First send a
// move event to the last subframe so that it will fire mouseouts.
if (last_mouse_move_event_subframe_ &&
last_mouse_move_event_subframe_->Tree().IsDescendantOf(frame_) &&
last_mouse_move_event_subframe_ != new_subframe) {
last_mouse_move_event_subframe_->GetEventHandler().HandleMouseLeaveEvent(
mev.Event());
last_mouse_move_event_subframe_->GetEventHandler()
.mouse_event_manager_->SetLastMousePositionAsUnknown();
}
if (new_subframe) {
// Update over/out state before passing the event to the subframe.
pointer_event_manager_->SendMouseAndPointerBoundaryEvents(
EffectiveMouseEventTargetNode(mev.InnerNode()), mev.CanvasRegionId(),
mev.Event());
// Event dispatch in sendMouseAndPointerBoundaryEvents may have caused the
// subframe of the target node to be detached from its LocalFrameView, in
// which case the event should not be passed.
if (new_subframe->View()) {
event_result =
PassMouseMoveEventToSubframe(mev, coalesced_events, predicted_events,
new_subframe, hovered_node_result);
}
} else {
if (scrollbar && !mouse_event_manager_->MousePressed()) {
// Handle hover effects on platforms that support visual feedback on
// scrollbar hovering.
scrollbar->MouseMoved(mev.Event());
}
if (LocalFrameView* view = frame_->View()) {
EventHandler::OptionalCursor optional_cursor =
SelectCursor(mev.GetHitTestLocation(), mev.GetHitTestResult());
if (optional_cursor.IsCursorChange()) {
view->SetCursor(optional_cursor.GetCursor());
}
}
}
last_mouse_move_event_subframe_ = new_subframe;
if (event_result != WebInputEventResult::kNotHandled)
return event_result;
event_result = DispatchMousePointerEvent(
WebInputEvent::kPointerMove, mev.InnerNode(), mev.CanvasRegionId(),
mev.Event(), coalesced_events, predicted_events);
// TODO(crbug.com/346473): Since there is no default action for the mousemove
// event we should consider doing drag&drop even when js cancels the
// mouse move event.
// https://w3c.github.io/uievents/#event-type-mousemove
if (event_result != WebInputEventResult::kNotHandled)
return event_result;
return mouse_event_manager_->HandleMouseDraggedEvent(mev);
}
WebInputEventResult EventHandler::HandleMouseReleaseEvent(
const WebMouseEvent& mouse_event) {
TRACE_EVENT0("blink", "EventHandler::handleMouseReleaseEvent");
// For 4th/5th button in the mouse since Chrome does not yet send
// button value to Blink but in some cases it does send the event.
// This check is needed to suppress such an event (crbug.com/574959)
if (mouse_event.button == WebPointerProperties::Button::kNoButton)
return WebInputEventResult::kHandledSuppressed;
if (!mouse_event.FromTouch())
frame_->Selection().SetCaretBlinkingSuspended(false);
if (RuntimeEnabledFeatures::MiddleClickAutoscrollEnabled()) {
if (Page* page = frame_->GetPage()) {
page->GetAutoscrollController()
.HandleMouseReleaseForMiddleClickAutoscroll(
frame_,
mouse_event.button == WebPointerProperties::Button::kMiddle);
}
}
mouse_event_manager_->ReleaseMousePress();
mouse_event_manager_->SetLastKnownMousePosition(mouse_event);
mouse_event_manager_->HandleSvgPanIfNeeded(true);
if (frame_set_being_resized_) {
CaptureMouseEventsToWidget(false);
return mouse_event_manager_->SetMousePositionAndDispatchMouseEvent(
EffectiveMouseEventTargetNode(frame_set_being_resized_.Get()), String(),
event_type_names::kMouseup, mouse_event);
}
if (last_scrollbar_under_mouse_) {
mouse_event_manager_->InvalidateClick();
last_scrollbar_under_mouse_->MouseUp(mouse_event);
CaptureMouseEventsToWidget(false);
return DispatchMousePointerEvent(
WebInputEvent::kPointerUp, mouse_event_manager_->GetNodeUnderMouse(),
String(), mouse_event, Vector<WebMouseEvent>(),
Vector<WebMouseEvent>());
}
// Mouse events simulated from touch should not hit-test again.
DCHECK(!mouse_event.FromTouch());
HitTestRequest::HitTestRequestType hit_type = HitTestRequest::kRelease;
HitTestRequest request(hit_type);
MouseEventWithHitTestResults mev =
event_handling_util::PerformMouseEventHitTest(frame_, request,
mouse_event);
Element* mouse_release_target = mev.InnerElement();
LocalFrame* subframe =
capturing_mouse_events_node_.Get()
? event_handling_util::SubframeForTargetNode(
capturing_mouse_events_node_.Get())
: event_handling_util::SubframeForHitTestResult(mev);
if (event_handler_will_reset_capturing_mouse_events_node_)
capturing_mouse_events_node_ = nullptr;
if (subframe)
return PassMouseReleaseEventToSubframe(mev, subframe);
// Mouse events will be associated with the Document where mousedown
// occurred. If, e.g., there is a mousedown, then a drag to a different
// Document and mouseup there, the mouseup's gesture will be associated with
// the mousedown's Document. It's not absolutely certain that this is the
// correct behavior.
std::unique_ptr<UserGestureIndicator> gesture_indicator;
if (frame_->LocalFrameRoot()
.GetEventHandler()
.last_mouse_down_user_gesture_token_) {
gesture_indicator = std::make_unique<UserGestureIndicator>(
std::move(frame_->LocalFrameRoot()
.GetEventHandler()
.last_mouse_down_user_gesture_token_));
} else {
gesture_indicator = LocalFrame::NotifyUserActivation(frame_);
}
WebInputEventResult event_result = DispatchMousePointerEvent(
WebInputEvent::kPointerUp, mev.InnerNode(), mev.CanvasRegionId(),
mev.Event(), Vector<WebMouseEvent>(), Vector<WebMouseEvent>());
WebInputEventResult click_event_result =
mouse_release_target ? mouse_event_manager_->DispatchMouseClickIfNeeded(
mev, *mouse_release_target)
: WebInputEventResult::kNotHandled;
scroll_manager_->ClearResizeScrollableArea(false);
if (event_result == WebInputEventResult::kNotHandled)
event_result = mouse_event_manager_->HandleMouseReleaseEvent(mev);
mouse_event_manager_->HandleMouseReleaseEventUpdateStates();
CaptureMouseEventsToWidget(false);
return event_handling_util::MergeEventResult(click_event_result,
event_result);
}
static bool TargetIsFrame(Node* target, LocalFrame*& frame) {
if (!IsHTMLFrameElementBase(target))
return false;
// Cross-process drag and drop is not yet supported.
if (ToHTMLFrameElementBase(target)->ContentFrame() &&
!ToHTMLFrameElementBase(target)->ContentFrame()->IsLocalFrame())
return false;
frame = ToLocalFrame(ToHTMLFrameElementBase(target)->ContentFrame());
return true;
}
WebInputEventResult EventHandler::UpdateDragAndDrop(
const WebMouseEvent& event,
DataTransfer* data_transfer) {
WebInputEventResult event_result = WebInputEventResult::kNotHandled;
if (!frame_->View())
return event_result;
HitTestRequest request(HitTestRequest::kReadOnly);
MouseEventWithHitTestResults mev =
event_handling_util::PerformMouseEventHitTest(frame_, request, event);
// Drag events should never go to text nodes (following IE, and proper
// mouseover/out dispatch)
Node* new_target = mev.InnerNode();
if (new_target && new_target->IsTextNode())
new_target = FlatTreeTraversal::Parent(*new_target);
if (AutoscrollController* controller =
scroll_manager_->GetAutoscrollController()) {
controller->UpdateDragAndDrop(new_target,
FlooredIntPoint(event.PositionInRootFrame()),
event.TimeStamp());
}
if (drag_target_ != new_target) {
// FIXME: this ordering was explicitly chosen to match WinIE. However,
// it is sometimes incorrect when dragging within subframes, as seen with
// web_tests/fast/events/drag-in-frames.html.
//
// Moreover, this ordering conforms to section 7.9.4 of the HTML 5 spec.
// <http://dev.w3.org/html5/spec/Overview.html#drag-and-drop-processing-model>.
LocalFrame* target_frame;
if (TargetIsFrame(new_target, target_frame)) {
if (target_frame)
event_result = target_frame->GetEventHandler().UpdateDragAndDrop(
event, data_transfer);
} else if (new_target) {
// As per section 7.9.4 of the HTML 5 spec., we must always fire a drag
// event before firing a dragenter, dragleave, or dragover event.
if (mouse_event_manager_->GetDragState().drag_src_) {
// For now we don't care if event handler cancels default behavior,
// since there is none.
mouse_event_manager_->DispatchDragSrcEvent(event_type_names::kDrag,
event);
}
event_result = mouse_event_manager_->DispatchDragEvent(
event_type_names::kDragenter, new_target, drag_target_, event,
data_transfer);
}
if (TargetIsFrame(drag_target_.Get(), target_frame)) {
if (target_frame)
event_result = target_frame->GetEventHandler().UpdateDragAndDrop(
event, data_transfer);
} else if (drag_target_) {
mouse_event_manager_->DispatchDragEvent(event_type_names::kDragleave,
drag_target_.Get(), new_target,
event, data_transfer);
}
if (new_target) {
// We do not explicitly call m_mouseEventManager->dispatchDragEvent here
// because it could ultimately result in the appearance that two dragover
// events fired. So, we mark that we should only fire a dragover event on
// the next call to this function.
should_only_fire_drag_over_event_ = true;
}
} else {
LocalFrame* target_frame;
if (TargetIsFrame(new_target, target_frame)) {
if (target_frame)
event_result = target_frame->GetEventHandler().UpdateDragAndDrop(
event, data_transfer);
} else if (new_target) {
// Note, when dealing with sub-frames, we may need to fire only a dragover
// event as a drag event may have been fired earlier.
if (!should_only_fire_drag_over_event_ &&
mouse_event_manager_->GetDragState().drag_src_) {
// For now we don't care if event handler cancels default behavior,
// since there is none.
mouse_event_manager_->DispatchDragSrcEvent(event_type_names::kDrag,
event);
}
event_result = mouse_event_manager_->DispatchDragEvent(
event_type_names::kDragover, new_target, nullptr, event,
data_transfer);
should_only_fire_drag_over_event_ = false;
}
}
drag_target_ = new_target;
return event_result;
}
void EventHandler::CancelDragAndDrop(const WebMouseEvent& event,
DataTransfer* data_transfer) {
LocalFrame* target_frame;
if (TargetIsFrame(drag_target_.Get(), target_frame)) {
if (target_frame)
target_frame->GetEventHandler().CancelDragAndDrop(event, data_transfer);
} else if (drag_target_.Get()) {
if (mouse_event_manager_->GetDragState().drag_src_) {
mouse_event_manager_->DispatchDragSrcEvent(event_type_names::kDrag,
event);
}
mouse_event_manager_->DispatchDragEvent(event_type_names::kDragleave,
drag_target_.Get(), nullptr, event,
data_transfer);
}
ClearDragState();
}
WebInputEventResult EventHandler::PerformDragAndDrop(
const WebMouseEvent& event,
DataTransfer* data_transfer) {
LocalFrame* target_frame;
WebInputEventResult result = WebInputEventResult::kNotHandled;
if (TargetIsFrame(drag_target_.Get(), target_frame)) {
if (target_frame)
result = target_frame->GetEventHandler().PerformDragAndDrop(
event, data_transfer);
} else if (drag_target_.Get()) {
result = mouse_event_manager_->DispatchDragEvent(
event_type_names::kDrop, drag_target_.Get(), nullptr, event,
data_transfer);
}
ClearDragState();
return result;
}
void EventHandler::ClearDragState() {
scroll_manager_->StopAutoscroll();
drag_target_ = nullptr;
capturing_mouse_events_node_ = nullptr;
should_only_fire_drag_over_event_ = false;
}
void EventHandler::AnimateSnapFling(base::TimeTicks monotonic_time) {
scroll_manager_->AnimateSnapFling(monotonic_time);
}
void EventHandler::RecomputeMouseHoverState() {
mouse_event_manager_->RecomputeMouseHoverState();
}
void EventHandler::SetCapturingMouseEventsNode(Node* n) {
CaptureMouseEventsToWidget(n);
capturing_mouse_events_node_ = n;
}
Node* EventHandler::EffectiveMouseEventTargetNode(Node* target_node) {
Node* new_node_under_mouse = target_node;
if (capturing_mouse_events_node_) {
new_node_under_mouse = capturing_mouse_events_node_.Get();
} else {
// If the target node is a text node, dispatch on the parent node -
// rdar://4196646
if (new_node_under_mouse && new_node_under_mouse->IsTextNode())
new_node_under_mouse = FlatTreeTraversal::Parent(*new_node_under_mouse);
}
return new_node_under_mouse;
}
bool EventHandler::IsTouchPointerIdActiveOnFrame(int pointer_id,
LocalFrame* frame) const {
DCHECK_EQ(frame_, &frame_->LocalFrameRoot());
return pointer_event_manager_->IsTouchPointerIdActiveOnFrame(pointer_id,
frame);
}
bool EventHandler::RootFrameTouchPointerActiveInCurrentFrame(
int pointer_id) const {
return frame_ != &frame_->LocalFrameRoot() &&
frame_->LocalFrameRoot()
.GetEventHandler()
.IsTouchPointerIdActiveOnFrame(pointer_id, frame_);
}
bool EventHandler::IsPointerEventActive(int pointer_id) {
return pointer_event_manager_->IsActive(pointer_id) ||
RootFrameTouchPointerActiveInCurrentFrame(pointer_id);
}
void EventHandler::SetPointerCapture(int pointer_id, EventTarget* target) {
// TODO(crbug.com/591387): This functionality should be per page not per
// frame.
if (RootFrameTouchPointerActiveInCurrentFrame(pointer_id)) {
frame_->LocalFrameRoot().GetEventHandler().SetPointerCapture(pointer_id,
target);
} else {
pointer_event_manager_->SetPointerCapture(pointer_id, target);
}
}
void EventHandler::ReleasePointerCapture(int pointer_id, EventTarget* target) {
if (RootFrameTouchPointerActiveInCurrentFrame(pointer_id)) {
frame_->LocalFrameRoot().GetEventHandler().ReleasePointerCapture(pointer_id,
target);
} else {
pointer_event_manager_->ReleasePointerCapture(pointer_id, target);
}
}
void EventHandler::ReleaseMousePointerCapture() {
pointer_event_manager_->ReleaseMousePointerCapture();
}
bool EventHandler::HasPointerCapture(int pointer_id,
const EventTarget* target) const {
if (RootFrameTouchPointerActiveInCurrentFrame(pointer_id)) {
return frame_->LocalFrameRoot().GetEventHandler().HasPointerCapture(
pointer_id, target);
} else {
return pointer_event_manager_->HasPointerCapture(pointer_id, target);
}
}
bool EventHandler::HasProcessedPointerCapture(int pointer_id,
const EventTarget* target) const {
return pointer_event_manager_->HasProcessedPointerCapture(pointer_id, target);
}
void EventHandler::ProcessPendingPointerCaptureForPointerLock(
const WebMouseEvent& mouse_event) {
pointer_event_manager_->ProcessPendingPointerCaptureForPointerLock(
mouse_event);
}
void EventHandler::ElementRemoved(EventTarget* target) {
pointer_event_manager_->ElementRemoved(target);
if (target)
mouse_wheel_event_manager_->ElementRemoved(target->ToNode());
}
WebInputEventResult EventHandler::DispatchMousePointerEvent(
const WebInputEvent::Type event_type,
Node* target_node,
const String& canvas_region_id,
const WebMouseEvent& mouse_event,
const Vector<WebMouseEvent>& coalesced_events,
const Vector<WebMouseEvent>& predicted_events) {
const auto& event_result = pointer_event_manager_->SendMousePointerEvent(
EffectiveMouseEventTargetNode(target_node), canvas_region_id, event_type,
mouse_event, coalesced_events, predicted_events);
return event_result;
}
WebInputEventResult EventHandler::HandleWheelEvent(
const WebMouseWheelEvent& event) {
return mouse_wheel_event_manager_->HandleWheelEvent(event);
}
// TODO(crbug.com/665924): This function bypasses all Handle*Event path.
// It should be using that flow instead of creating/sending events directly.
WebInputEventResult EventHandler::HandleTargetedMouseEvent(
Node* target,
const WebMouseEvent& event,
const AtomicString& mouse_event_type,
const Vector<WebMouseEvent>& coalesced_events,
const Vector<WebMouseEvent>& predicted_events,
const String& canvas_region_id) {
mouse_event_manager_->SetClickCount(event.click_count);
return pointer_event_manager_->DirectDispatchMousePointerEvent(
target, event, mouse_event_type, coalesced_events, predicted_events,
canvas_region_id);
}
WebInputEventResult EventHandler::HandleGestureEvent(
const WebGestureEvent& gesture_event) {
// Propagation to inner frames is handled below this function.
DCHECK_EQ(frame_, &frame_->LocalFrameRoot());
DCHECK_NE(0, gesture_event.FrameScale());
// Scrolling-related gesture events invoke EventHandler recursively for each
// frame down the chain, doing a single-frame hit-test per frame. This matches
// handleWheelEvent.
// FIXME: Add a test that traverses this path, e.g. for devtools overlay.
if (gesture_event.IsScrollEvent())
return HandleGestureScrollEvent(gesture_event);
// Hit test across all frames and do touch adjustment as necessary for the
// event type.
GestureEventWithHitTestResults targeted_event =
TargetGestureEvent(gesture_event);
return HandleGestureEvent(targeted_event);
}
WebInputEventResult EventHandler::HandleGestureEvent(
const GestureEventWithHitTestResults& targeted_event) {
TRACE_EVENT0("input", "EventHandler::handleGestureEvent");
if (!frame_->GetPage())
return WebInputEventResult::kNotHandled;
// Propagation to inner frames is handled below this function.
DCHECK_EQ(frame_, &frame_->LocalFrameRoot());
// Non-scrolling related gesture events do a single cross-frame hit-test and
// jump directly to the inner most frame. This matches handleMousePressEvent
// etc.
DCHECK(!targeted_event.Event().IsScrollEvent());
if (targeted_event.Event().GetType() == WebInputEvent::kGestureShowPress)
last_show_press_timestamp_ = CurrentTimeTicks();
// Update mouseout/leave/over/enter events before jumping directly to the
// inner most frame.
if (targeted_event.Event().GetType() == WebInputEvent::kGestureTap)
UpdateGestureTargetNodeForMouseEvent(targeted_event);
// Route to the correct frame.
if (LocalFrame* inner_frame =
targeted_event.GetHitTestResult().InnerNodeFrame())
return inner_frame->GetEventHandler().HandleGestureEventInFrame(
targeted_event);
// No hit test result, handle in root instance. Perhaps we should just return
// false instead?
return gesture_manager_->HandleGestureEventInFrame(targeted_event);
}
WebInputEventResult EventHandler::HandleGestureEventInFrame(
const GestureEventWithHitTestResults& targeted_event) {
return gesture_manager_->HandleGestureEventInFrame(targeted_event);
}
WebInputEventResult EventHandler::HandleGestureScrollEvent(
const WebGestureEvent& gesture_event) {
TRACE_EVENT0("input", "EventHandler::handleGestureScrollEvent");
if (!frame_->GetPage())
return WebInputEventResult::kNotHandled;
return scroll_manager_->HandleGestureScrollEvent(gesture_event);
}
WebInputEventResult EventHandler::HandleGestureScrollEnd(
const WebGestureEvent& gesture_event) {
if (!frame_->GetPage())
return WebInputEventResult::kNotHandled;
return scroll_manager_->HandleGestureScrollEnd(gesture_event);
}
void EventHandler::SetMouseDownMayStartAutoscroll() {
mouse_event_manager_->SetMouseDownMayStartAutoscroll();
}
bool EventHandler::IsScrollbarHandlingGestures() const {
return scroll_manager_->IsScrollbarHandlingGestures();
}
bool EventHandler::ShouldApplyTouchAdjustment(
const WebGestureEvent& event) const {
if (frame_->GetSettings() &&
!frame_->GetSettings()->GetTouchAdjustmentEnabled())
return false;
if (event.primary_pointer_type == WebPointerProperties::PointerType::kPen)
return false;
return !event.TapAreaInRootFrame().IsEmpty();
}
void EventHandler::CacheTouchAdjustmentResult(uint32_t id,
FloatPoint adjusted_point) {
touch_adjustment_result_.unique_event_id = id;
touch_adjustment_result_.adjusted_point = adjusted_point;
}
bool EventHandler::GestureCorrespondsToAdjustedTouch(
const WebGestureEvent& event) {
if (!RuntimeEnabledFeatures::UnifiedTouchAdjustmentEnabled())
return false;
// Gesture events start with a GestureTapDown. If GestureTapDown's unique id
// matches stored adjusted touchstart event id, then we can use the stored
// result for following gesture event.
if (event.GetType() == WebInputEvent::kGestureTapDown) {
should_use_touch_event_adjusted_point_ =
(event.unique_touch_event_id != 0 &&
event.unique_touch_event_id ==
touch_adjustment_result_.unique_event_id);
}
// Check if the adjusted point is in the gesture event tap rect.
// If not, should not use this touch point in following events.
if (should_use_touch_event_adjusted_point_) {
FloatRect tap_rect(FloatPoint(event.PositionInRootFrame()) -
FloatSize(event.TapAreaInRootFrame()) * 0.5,
FloatSize(event.TapAreaInRootFrame()));
should_use_touch_event_adjusted_point_ =
tap_rect.Contains(touch_adjustment_result_.adjusted_point);
}
return should_use_touch_event_adjusted_point_;
}
bool EventHandler::BestClickableNodeForHitTestResult(
const HitTestLocation& location,
const HitTestResult& result,
IntPoint& target_point,
Node*& target_node) {
// FIXME: Unify this with the other best* functions which are very similar.
TRACE_EVENT0("input", "EventHandler::bestClickableNodeForHitTestResult");
DCHECK(location.IsRectBasedTest());
// If the touch is over a scrollbar, don't adjust the touch point since touch
// adjustment only takes into account DOM nodes so a touch over a scrollbar
// will be adjusted towards nearby nodes. This leads to things like textarea
// scrollbars being untouchable.
if (result.GetScrollbar()) {
target_node = nullptr;
return false;
}
IntPoint touch_center =
frame_->View()->ConvertToRootFrame(RoundedIntPoint(location.Point()));
IntRect touch_rect =
frame_->View()->ConvertToRootFrame(location.EnclosingIntRect());
HeapVector<Member<Node>, 11> nodes;
CopyToVector(result.ListBasedTestResult(), nodes);
// FIXME: the explicit Vector conversion copies into a temporary and is
// wasteful.
return FindBestClickableCandidate(target_node, target_point, touch_center,
touch_rect,
HeapVector<Member<Node>>(nodes));
}
bool EventHandler::BestContextMenuNodeForHitTestResult(
const HitTestLocation& location,
const HitTestResult& result,
IntPoint& target_point,
Node*& target_node) {
DCHECK(location.IsRectBasedTest());
IntPoint touch_center =
frame_->View()->ConvertToRootFrame(RoundedIntPoint(location.Point()));
IntRect touch_rect =
frame_->View()->ConvertToRootFrame(location.EnclosingIntRect());
HeapVector<Member<Node>, 11> nodes;
CopyToVector(result.ListBasedTestResult(), nodes);
// FIXME: the explicit Vector conversion copies into a temporary and is
// wasteful.
return FindBestContextMenuCandidate(target_node, target_point, touch_center,
touch_rect,
HeapVector<Member<Node>>(nodes));
}
// Update the hover and active state across all frames for this gesture.
// This logic is different than the mouse case because mice send MouseLeave
// events to frames as they're exited. With gestures, a single event
// conceptually both 'leaves' whatever frame currently had hover and enters a
// new frame
void EventHandler::UpdateGestureHoverActiveState(const HitTestRequest& request,
Element* inner_element) {
DCHECK_EQ(frame_, &frame_->LocalFrameRoot());
HeapVector<Member<LocalFrame>> new_hover_frame_chain;
LocalFrame* new_hover_frame_in_document =
inner_element ? inner_element->GetDocument().GetFrame() : nullptr;
// Insert the ancestors of the frame having the new hovered element to the
// frame chain. The frame chain doesn't include the main frame to avoid the
// redundant work that cleans the hover state because the hover state for the
// main frame is updated by calling Document::updateHoverActiveState.
while (new_hover_frame_in_document && new_hover_frame_in_document != frame_) {
new_hover_frame_chain.push_back(new_hover_frame_in_document);
Frame* parent_frame = new_hover_frame_in_document->Tree().Parent();
new_hover_frame_in_document = parent_frame && parent_frame->IsLocalFrame()
? ToLocalFrame(parent_frame)
: nullptr;
}
Element* old_hover_element_in_cur_doc = frame_->GetDocument()->HoverElement();
Element* new_innermost_hover_element = inner_element;
if (new_innermost_hover_element != old_hover_element_in_cur_doc) {
wtf_size_t index_frame_chain = new_hover_frame_chain.size();
// Clear the hover state on any frames which are no longer in the frame
// chain of the hovered element.
while (old_hover_element_in_cur_doc &&
old_hover_element_in_cur_doc->IsFrameOwnerElement()) {
LocalFrame* new_hover_frame = nullptr;
// If we can't get the frame from the new hover frame chain,
// the newHoverFrame will be null and the old hover state will be cleared.
if (index_frame_chain > 0)
new_hover_frame = new_hover_frame_chain[--index_frame_chain];
HTMLFrameOwnerElement* owner =
ToHTMLFrameOwnerElement(old_hover_element_in_cur_doc);
if (!owner->ContentFrame() || !owner->ContentFrame()->IsLocalFrame())
break;
LocalFrame* old_hover_frame = ToLocalFrame(owner->ContentFrame());
Document* doc = old_hover_frame->GetDocument();
if (!doc)
break;
old_hover_element_in_cur_doc = doc->HoverElement();
// If the old hovered frame is different from the new hovered frame.
// we should clear the old hovered element from the old hovered frame.
if (new_hover_frame != old_hover_frame)
doc->UpdateHoverActiveState(request, nullptr);
}
}
// Recursively set the new active/hover states on every frame in the chain of
// innerElement.
frame_->GetDocument()->UpdateHoverActiveState(request, inner_element);
}
// Update the mouseover/mouseenter/mouseout/mouseleave events across all frames
// for this gesture, before passing the targeted gesture event directly to a hit
// frame.
void EventHandler::UpdateGestureTargetNodeForMouseEvent(
const GestureEventWithHitTestResults& targeted_event) {
DCHECK_EQ(frame_, &frame_->LocalFrameRoot());
// Behaviour of this function is as follows:
// - Create the chain of all entered frames.
// - Compare the last frame chain under the gesture to newly entered frame
// chain from the main frame one by one.
// - If the last frame doesn't match with the entered frame, then create the
// chain of exited frames from the last frame chain.
// - Dispatch mouseout/mouseleave events of the exited frames from the inside
// out.
// - Dispatch mouseover/mouseenter events of the entered frames into the
// inside.
// Insert the ancestors of the frame having the new target node to the entered
// frame chain.
HeapVector<Member<LocalFrame>, 2> entered_frame_chain;
LocalFrame* entered_frame_in_document =
targeted_event.GetHitTestResult().InnerNodeFrame();
while (entered_frame_in_document) {
entered_frame_chain.push_back(entered_frame_in_document);
Frame* parent_frame = entered_frame_in_document->Tree().Parent();
entered_frame_in_document = parent_frame && parent_frame->IsLocalFrame()
? ToLocalFrame(parent_frame)
: nullptr;
}
wtf_size_t index_entered_frame_chain = entered_frame_chain.size();
LocalFrame* exited_frame_in_document = frame_;
HeapVector<Member<LocalFrame>, 2> exited_frame_chain;
// Insert the frame from the disagreement between last frames and entered
// frames.
while (exited_frame_in_document) {
Node* last_node_under_tap = exited_frame_in_document->GetEventHandler()
.mouse_event_manager_->GetNodeUnderMouse();
if (!last_node_under_tap)
break;
LocalFrame* next_exited_frame_in_document = nullptr;
if (last_node_under_tap->IsFrameOwnerElement()) {
HTMLFrameOwnerElement* owner =
ToHTMLFrameOwnerElement(last_node_under_tap);
if (owner->ContentFrame() && owner->ContentFrame()->IsLocalFrame())
next_exited_frame_in_document = ToLocalFrame(owner->ContentFrame());
}
if (exited_frame_chain.size() > 0) {
exited_frame_chain.push_back(exited_frame_in_document);
} else {
LocalFrame* last_entered_frame_in_document =
index_entered_frame_chain
? entered_frame_chain[index_entered_frame_chain - 1]
: nullptr;
if (exited_frame_in_document != last_entered_frame_in_document)
exited_frame_chain.push_back(exited_frame_in_document);
else if (next_exited_frame_in_document && index_entered_frame_chain)
--index_entered_frame_chain;
}
exited_frame_in_document = next_exited_frame_in_document;
}
const WebGestureEvent& gesture_event = targeted_event.Event();
unsigned modifiers = gesture_event.GetModifiers();
WebMouseEvent fake_mouse_move(
WebInputEvent::kMouseMove, gesture_event,
WebPointerProperties::Button::kNoButton,
/* clickCount */ 0,
modifiers | WebInputEvent::Modifiers::kIsCompatibilityEventForTouch,
gesture_event.TimeStamp());
// Update the mouseout/mouseleave event
wtf_size_t index_exited_frame_chain = exited_frame_chain.size();
while (index_exited_frame_chain) {
LocalFrame* leave_frame = exited_frame_chain[--index_exited_frame_chain];
leave_frame->GetEventHandler().mouse_event_manager_->SetNodeUnderMouse(
EffectiveMouseEventTargetNode(nullptr), String(), fake_mouse_move);
}
// update the mouseover/mouseenter event
while (index_entered_frame_chain) {
Frame* parent_frame =
entered_frame_chain[--index_entered_frame_chain]->Tree().Parent();
if (parent_frame && parent_frame->IsLocalFrame()) {
ToLocalFrame(parent_frame)
->GetEventHandler()
.mouse_event_manager_->SetNodeUnderMouse(
EffectiveMouseEventTargetNode(ToHTMLFrameOwnerElement(
entered_frame_chain[index_entered_frame_chain]->Owner())),
String(), fake_mouse_move);
}
}
}
GestureEventWithHitTestResults EventHandler::TargetGestureEvent(
const WebGestureEvent& gesture_event,
bool read_only) {
TRACE_EVENT0("input", "EventHandler::targetGestureEvent");
DCHECK_EQ(frame_, &frame_->LocalFrameRoot());
// Scrolling events get hit tested per frame (like wheel events do).
DCHECK(!gesture_event.IsScrollEvent());
HitTestRequest::HitTestRequestType hit_type =
gesture_manager_->GetHitTypeForGestureType(gesture_event.GetType());
TimeDelta active_interval;
bool should_keep_active_for_min_interval = false;
if (read_only) {
hit_type |= HitTestRequest::kReadOnly;
} else if (gesture_event.GetType() == WebInputEvent::kGestureTap &&
last_show_press_timestamp_) {
// If the Tap is received very shortly after ShowPress, we want to
// delay clearing of the active state so that it's visible to the user
// for at least a couple of frames.
active_interval = CurrentTimeTicks() - last_show_press_timestamp_.value();
should_keep_active_for_min_interval =
active_interval < kMinimumActiveInterval;
if (should_keep_active_for_min_interval)
hit_type |= HitTestRequest::kReadOnly;
}
GestureEventWithHitTestResults event_with_hit_test_results =
HitTestResultForGestureEvent(gesture_event, hit_type);
// Now apply hover/active state to the final target.
HitTestRequest request(hit_type | HitTestRequest::kAllowChildFrameContent);
if (!request.ReadOnly()) {
UpdateGestureHoverActiveState(
request, event_with_hit_test_results.GetHitTestResult().InnerElement());
}
if (should_keep_active_for_min_interval) {
last_deferred_tap_element_ =
event_with_hit_test_results.GetHitTestResult().InnerElement();
// TODO(https://crbug.com/668758): Use a normal BeginFrame update for this.
active_interval_timer_.StartOneShot(
kMinimumActiveInterval - active_interval, FROM_HERE);
}
return event_with_hit_test_results;
}
GestureEventWithHitTestResults EventHandler::HitTestResultForGestureEvent(
const WebGestureEvent& gesture_event,
HitTestRequest::HitTestRequestType hit_type) {
// Perform the rect-based hit-test (or point-based if adjustment is
// disabled). Note that we don't yet apply hover/active state here because
// we need to resolve touch adjustment first so that we apply hover/active
// it to the final adjusted node.
hit_type |= HitTestRequest::kReadOnly;
WebGestureEvent adjusted_event = gesture_event;
LayoutSize hit_rect_size;
if (ShouldApplyTouchAdjustment(gesture_event)) {
// If gesture_event unique id matches the stored touch event result, do
// point-base hit test. Otherwise add padding and do rect-based hit test.
if (GestureCorrespondsToAdjustedTouch(gesture_event)) {
adjusted_event.ApplyTouchAdjustment(
touch_adjustment_result_.adjusted_point);
} else {
hit_rect_size = GetHitTestRectForAdjustment(
*frame_, LayoutSize(adjusted_event.TapAreaInRootFrame()));
if (!hit_rect_size.IsEmpty())
hit_type |= HitTestRequest::kListBased;
}
}
HitTestLocation location;
LocalFrame& root_frame = frame_->LocalFrameRoot();
HitTestResult hit_test_result;
if (hit_rect_size.IsEmpty()) {
location = HitTestLocation(adjusted_event.PositionInRootFrame());
hit_test_result = root_frame.GetEventHandler().HitTestResultAtLocation(
location, hit_type);
} else {
LayoutPoint top_left(adjusted_event.PositionInRootFrame());
top_left.Move(-hit_rect_size * 0.5f);
location = HitTestLocation(LayoutRect(top_left, hit_rect_size));
hit_test_result = root_frame.GetEventHandler().HitTestResultAtLocation(
location, hit_type);
}
if (location.IsRectBasedTest()) {
// Adjust the location of the gesture to the most likely nearby node, as
// appropriate for the type of event.
ApplyTouchAdjustment(&adjusted_event, location, &hit_test_result);
// Do a new hit-test at the (adjusted) gesture co-ordinates. This is
// necessary because rect-based hit testing and touch adjustment sometimes
// return a different node than what a point-based hit test would return for
// the same point.
// FIXME: Fix touch adjustment to avoid the need for a redundant hit test.
// http://crbug.com/398914
LocalFrame* hit_frame = hit_test_result.InnerNodeFrame();
if (!hit_frame)
hit_frame = frame_;
location = HitTestLocation(adjusted_event.PositionInRootFrame());
hit_test_result = root_frame.GetEventHandler().HitTestResultAtLocation(
location,
(hit_type | HitTestRequest::kReadOnly) & ~HitTestRequest::kListBased);
}
// If we did a rect-based hit test it must be resolved to the best single node
// by now to ensure consumers don't accidentally use one of the other
// candidates.
DCHECK(!location.IsRectBasedTest());
if (ShouldApplyTouchAdjustment(gesture_event) &&
(gesture_event.GetType() == WebInputEvent::kGestureTap ||
gesture_event.GetType() == WebInputEvent::kGestureLongPress)) {
float adjusted_distance = FloatSize(adjusted_event.PositionInRootFrame() -
gesture_event.PositionInRootFrame())
.DiagonalLength();
UMA_HISTOGRAM_COUNTS_100("Event.Touch.TouchAdjustment.AdjustDistance",
static_cast<int>(adjusted_distance));
}
return GestureEventWithHitTestResults(adjusted_event, location,
hit_test_result);
}
void EventHandler::ApplyTouchAdjustment(WebGestureEvent* gesture_event,
HitTestLocation& location,
HitTestResult* hit_test_result) {
Node* adjusted_node = nullptr;
IntPoint adjusted_point =
FlooredIntPoint(gesture_event->PositionInRootFrame());
bool adjusted = false;
switch (gesture_event->GetType()) {
case WebInputEvent::kGestureTap:
case WebInputEvent::kGestureTapUnconfirmed:
case WebInputEvent::kGestureTapDown:
case WebInputEvent::kGestureShowPress:
adjusted = BestClickableNodeForHitTestResult(
location, *hit_test_result, adjusted_point, adjusted_node);
break;
case WebInputEvent::kGestureLongPress:
case WebInputEvent::kGestureLongTap:
case WebInputEvent::kGestureTwoFingerTap:
adjusted = BestContextMenuNodeForHitTestResult(
location, *hit_test_result, adjusted_point, adjusted_node);
break;
default:
NOTREACHED();
}
// Update the hit-test result to be a point-based result instead of a
// rect-based result.
// FIXME: We should do this even when no candidate matches the node filter.
// crbug.com/398914
if (adjusted) {
LayoutPoint point = frame_->View()->ConvertFromRootFrame(adjusted_point);
DCHECK(location.ContainsPoint(FloatPoint(point)));
DCHECK(location.IsRectBasedTest());
location = hit_test_result->ResolveRectBasedTest(adjusted_node, point);
gesture_event->ApplyTouchAdjustment(
WebFloatPoint(adjusted_point.X(), adjusted_point.Y()));
}
}
WebInputEventResult EventHandler::SendContextMenuEvent(
const WebMouseEvent& event,
Node* override_target_node) {
LocalFrameView* v = frame_->View();
if (!v)
return WebInputEventResult::kNotHandled;
// Clear mouse press state to avoid initiating a drag while context menu is
// up.
mouse_event_manager_->ReleaseMousePress();
if (last_scrollbar_under_mouse_)
last_scrollbar_under_mouse_->MouseUp(event);
LayoutPoint position_in_contents =
v->ConvertFromRootFrame(FlooredIntPoint(event.PositionInRootFrame()));
HitTestRequest request(HitTestRequest::kActive);
MouseEventWithHitTestResults mev =
frame_->GetDocument()->PerformMouseEventHitTest(
request, position_in_contents, event);
// Since |Document::performMouseEventHitTest()| modifies layout tree for
// setting hover element, we need to update layout tree for requirement of
// |SelectionController::sendContextMenuEvent()|.
frame_->GetDocument()->UpdateStyleAndLayoutIgnorePendingStylesheets();
GetSelectionController().SendContextMenuEvent(mev, position_in_contents);
Node* target_node =
override_target_node ? override_target_node : mev.InnerNode();
return mouse_event_manager_->DispatchMouseEvent(
EffectiveMouseEventTargetNode(target_node),
event_type_names::kContextmenu, event,
mev.GetHitTestResult().CanvasRegionId(), nullptr, nullptr);
}
static bool ShouldShowContextMenuAtSelection(const FrameSelection& selection) {
// TODO(editing-dev): The use of UpdateStyleAndLayoutIgnorePendingStylesheets
// needs to be audited. See http://crbug.com/590369 for more details.
selection.GetDocument().UpdateStyleAndLayoutIgnorePendingStylesheets();
const VisibleSelection& visible_selection =
selection.ComputeVisibleSelectionInDOMTree();
if (!visible_selection.IsRange() && !visible_selection.RootEditableElement())
return false;
return selection.SelectionHasFocus();
}
WebInputEventResult EventHandler::ShowNonLocatedContextMenu(
Element* override_target_element,
WebMenuSourceType source_type) {
LocalFrameView* view = frame_->View();
if (!view)
return WebInputEventResult::kNotHandled;
Document* doc = frame_->GetDocument();
if (!doc)
return WebInputEventResult::kNotHandled;
static const int kContextMenuMargin = 1;
#if defined(OS_WIN)
int right_aligned = ::GetSystemMetrics(SM_MENUDROPALIGNMENT);
#else
int right_aligned = 0;
#endif
IntPoint location_in_root_frame;
Element* focused_element =
override_target_element ? override_target_element : doc->FocusedElement();
FrameSelection& selection = frame_->Selection();
VisualViewport& visual_viewport = frame_->GetPage()->GetVisualViewport();
if (!override_target_element && ShouldShowContextMenuAtSelection(selection)) {
DCHECK(!doc->NeedsLayoutTreeUpdate());
IntRect first_rect =
FirstRectForRange(selection.ComputeVisibleSelectionInDOMTree()
.ToNormalizedEphemeralRange());
int x = right_aligned ? first_rect.MaxX() : first_rect.X();
// In a multiline edit, firstRect.maxY() would end up on the next line, so
// take the midpoint.
int y = (first_rect.MaxY() + first_rect.Y()) / 2;
location_in_root_frame = view->ConvertToRootFrame(IntPoint(x, y));
} else if (focused_element) {
IntRect clipped_rect = focused_element->BoundsInViewport();
location_in_root_frame =
visual_viewport.ViewportToRootFrame(clipped_rect.Center());
} else {
location_in_root_frame = IntPoint(
right_aligned
? visual_viewport.VisibleRect(kIncludeScrollbars).MaxX() -
kContextMenuMargin
: visual_viewport.GetScrollOffset().Width() + kContextMenuMargin,
visual_viewport.GetScrollOffset().Height() + kContextMenuMargin);
}
frame_->View()->SetCursor(PointerCursor());
IntPoint location_in_viewport =
visual_viewport.RootFrameToViewport(location_in_root_frame);
IntPoint global_position =
view->GetChromeClient()->ViewportToScreen(
IntRect(location_in_viewport, IntSize()), frame_->View())
.Location();
Node* target_node =
override_target_element ? override_target_element : doc->FocusedElement();
if (!target_node)
target_node = doc;
// Use the focused node as the target for hover and active.
HitTestRequest request(HitTestRequest::kActive);
HitTestLocation location(location_in_root_frame);
HitTestResult result(request, location);
result.SetInnerNode(target_node);
doc->UpdateHoverActiveState(request, result.InnerElement());
// The contextmenu event is a mouse event even when invoked using the
// keyboard. This is required for web compatibility.
WebInputEvent::Type event_type = WebInputEvent::kMouseDown;
if (frame_->GetSettings() &&
frame_->GetSettings()->GetShowContextMenuOnMouseUp())
event_type = WebInputEvent::kMouseUp;
WebMouseEvent mouse_event(
event_type,
WebFloatPoint(location_in_root_frame.X(), location_in_root_frame.Y()),
WebFloatPoint(global_position.X(), global_position.Y()),
WebPointerProperties::Button::kNoButton, /* clickCount */ 0,
WebInputEvent::kNoModifiers, CurrentTimeTicks(), source_type);
// TODO(dtapuska): Transition the mouseEvent to be created really in viewport
// coordinates instead of root frame coordinates.
mouse_event.SetFrameScale(1);
return SendContextMenuEvent(mouse_event, override_target_element);
}
void EventHandler::ScheduleHoverStateUpdate() {
// TODO(https://crbug.com/668758): Use a normal BeginFrame update for this.
if (!hover_timer_.IsActive() &&
!mouse_event_manager_->IsMousePositionUnknown())
hover_timer_.StartOneShot(TimeDelta(), FROM_HERE);
}
void EventHandler::ScheduleCursorUpdate() {
// We only want one timer for the page, rather than each frame having it's own
// timer competing which eachother (since there's only one mouse cursor).
DCHECK_EQ(frame_, &frame_->LocalFrameRoot());
// TODO(https://crbug.com/668758): Use a normal BeginFrame update for this.
if (!cursor_update_timer_.IsActive())
cursor_update_timer_.StartOneShot(kCursorUpdateInterval, FROM_HERE);
}
bool EventHandler::CursorUpdatePending() {
return cursor_update_timer_.IsActive();
}
bool EventHandler::FakeMouseMovePending() const {
return mouse_event_manager_->FakeMouseMovePending();
}
void EventHandler::MayUpdateHoverWhenContentUnderMouseChanged(
MouseEventManager::UpdateHoverReason update_hover_reason) {
if (update_hover_reason ==
MouseEventManager::UpdateHoverReason::kScrollOffsetChanged &&
RuntimeEnabledFeatures::NoHoverDuringScrollEnabled()) {
return;
}
mouse_event_manager_->MayUpdateHoverWhenContentUnderMouseChanged(
update_hover_reason);
}
void EventHandler::MayUpdateHoverAfterScroll(
const FloatQuad& scroller_rect_in_frame) {
mouse_event_manager_->MayUpdateHoverAfterScroll(scroller_rect_in_frame);
}
void EventHandler::SetResizingFrameSet(HTMLFrameSetElement* frame_set) {
CaptureMouseEventsToWidget(true);
frame_set_being_resized_ = frame_set;
}
void EventHandler::ResizeScrollableAreaDestroyed() {
scroll_manager_->ClearResizeScrollableArea(true);
}
void EventHandler::HoverTimerFired(TimerBase*) {
TRACE_EVENT0("input", "EventHandler::hoverTimerFired");
DCHECK(frame_);
DCHECK(frame_->GetDocument());
if (auto* layout_object = frame_->ContentLayoutObject()) {
if (LocalFrameView* view = frame_->View()) {
HitTestRequest request(HitTestRequest::kMove);
HitTestLocation location(view->ViewportToFrame(
mouse_event_manager_->LastKnownMousePosition()));
HitTestResult result(request, location);
layout_object->HitTest(location, result);
frame_->GetDocument()->UpdateHoverActiveState(request,
result.InnerElement());
}
}
}
void EventHandler::ActiveIntervalTimerFired(TimerBase*) {
TRACE_EVENT0("input", "EventHandler::activeIntervalTimerFired");
if (frame_ && frame_->GetDocument() && last_deferred_tap_element_) {
// FIXME: Enable condition when http://crbug.com/226842 lands
// m_lastDeferredTapElement.get() == m_frame->document()->activeElement()
HitTestRequest request(HitTestRequest::kTouchEvent |
HitTestRequest::kRelease);
frame_->GetDocument()->UpdateHoverActiveState(
request, last_deferred_tap_element_.Get());
}
last_deferred_tap_element_ = nullptr;
}
void EventHandler::NotifyElementActivated() {
// Since another element has been set to active, stop current timer and clear
// reference.
active_interval_timer_.Stop();
last_deferred_tap_element_ = nullptr;
}
bool EventHandler::HandleAccessKey(const WebKeyboardEvent& evt) {
return keyboard_event_manager_->HandleAccessKey(evt);
}
WebInputEventResult EventHandler::KeyEvent(
const WebKeyboardEvent& initial_key_event) {
return keyboard_event_manager_->KeyEvent(initial_key_event);
}
void EventHandler::DefaultKeyboardEventHandler(KeyboardEvent* event) {
keyboard_event_manager_->DefaultKeyboardEventHandler(
event, mouse_event_manager_->MousePressNode());
}
void EventHandler::DragSourceEndedAt(const WebMouseEvent& event,
DragOperation operation) {
// Asides from routing the event to the correct frame, the hit test is also an
// opportunity for Layer to update the :hover and :active pseudoclasses.
HitTestRequest request(HitTestRequest::kRelease);
MouseEventWithHitTestResults mev =
event_handling_util::PerformMouseEventHitTest(frame_, request, event);
LocalFrame* target_frame;
if (TargetIsFrame(mev.InnerNode(), target_frame)) {
if (target_frame) {
target_frame->GetEventHandler().DragSourceEndedAt(event, operation);
return;
}
}
mouse_event_manager_->DragSourceEndedAt(event, operation);
}
void EventHandler::UpdateDragStateAfterEditDragIfNeeded(
Element* root_editable_element) {
// If inserting the dragged contents removed the drag source, we still want to
// fire dragend at the root editble element.
if (mouse_event_manager_->GetDragState().drag_src_ &&
!mouse_event_manager_->GetDragState().drag_src_->isConnected())
mouse_event_manager_->GetDragState().drag_src_ = root_editable_element;
}
bool EventHandler::HandleTextInputEvent(const String& text,
Event* underlying_event,
TextEventInputType input_type) {
// Platforms should differentiate real commands like selectAll from text input
// in disguise (like insertNewline), and avoid dispatching text input events
// from keydown default handlers.
DCHECK(!underlying_event || !underlying_event->IsKeyboardEvent() ||
ToKeyboardEvent(underlying_event)->type() ==
event_type_names::kKeypress);
if (!frame_)
return false;
EventTarget* target;
if (underlying_event)
target = underlying_event->target();
else
target = EventTargetNodeForDocument(frame_->GetDocument());
if (!target)
return false;
TextEvent* event = TextEvent::Create(frame_->DomWindow(), text, input_type);
event->SetUnderlyingEvent(underlying_event);
target->DispatchEvent(*event);
return event->DefaultHandled() || event->defaultPrevented();
}
void EventHandler::DefaultTextInputEventHandler(TextEvent* event) {
if (frame_->GetEditor().HandleTextEvent(event))
event->SetDefaultHandled();
}
void EventHandler::CapsLockStateMayHaveChanged() {
keyboard_event_manager_->CapsLockStateMayHaveChanged();
}
bool EventHandler::PassMousePressEventToScrollbar(
MouseEventWithHitTestResults& mev) {
// Do not pass the mouse press to scrollbar if scrollbar pressed. If the
// user's left button is down, then the cursor moves outside the scrollbar
// and presses the middle button , we should not clear
// last_scrollbar_under_mouse_.
if (last_scrollbar_under_mouse_ &&
last_scrollbar_under_mouse_->PressedPart() != ScrollbarPart::kNoPart) {
return false;
}
Scrollbar* scrollbar = mev.GetScrollbar();
UpdateLastScrollbarUnderMouse(scrollbar, true);
if (!scrollbar || !scrollbar->Enabled())
return false;
scrollbar->MouseDown(mev.Event());
if (scrollbar->PressedPart() == ScrollbarPart::kThumbPart)
CaptureMouseEventsToWidget(true);
return true;
}
// If scrollbar (under mouse) is different from last, send a mouse exited. Set
// last to scrollbar if setLast is true; else set last to 0.
void EventHandler::UpdateLastScrollbarUnderMouse(Scrollbar* scrollbar,
bool set_last) {
if (last_scrollbar_under_mouse_ != scrollbar) {
// Send mouse exited to the old scrollbar.
if (last_scrollbar_under_mouse_)
last_scrollbar_under_mouse_->MouseExited();
// Send mouse entered if we're setting a new scrollbar.
if (scrollbar && set_last)
scrollbar->MouseEntered();
last_scrollbar_under_mouse_ = set_last ? scrollbar : nullptr;
}
}
WebInputEventResult EventHandler::PassMousePressEventToSubframe(
MouseEventWithHitTestResults& mev,
LocalFrame* subframe) {
GetSelectionController().PassMousePressEventToSubframe(mev);
WebInputEventResult result =
subframe->GetEventHandler().HandleMousePressEvent(mev.Event());
if (result != WebInputEventResult::kNotHandled)
return result;
return WebInputEventResult::kHandledSystem;
}
WebInputEventResult EventHandler::PassMouseMoveEventToSubframe(
MouseEventWithHitTestResults& mev,
const Vector<WebMouseEvent>& coalesced_events,
const Vector<WebMouseEvent>& predicted_events,
LocalFrame* subframe,
HitTestResult* hovered_node,
HitTestLocation* hit_test_location) {
if (mouse_event_manager_->MouseDownMayStartDrag())
return WebInputEventResult::kNotHandled;
WebInputEventResult result =
subframe->GetEventHandler().HandleMouseMoveOrLeaveEvent(
mev.Event(), coalesced_events, predicted_events, hovered_node,
hit_test_location);
if (result != WebInputEventResult::kNotHandled)
return result;
return WebInputEventResult::kHandledSystem;
}
WebInputEventResult EventHandler::PassMouseReleaseEventToSubframe(
MouseEventWithHitTestResults& mev,
LocalFrame* subframe) {
WebInputEventResult result =
subframe->GetEventHandler().HandleMouseReleaseEvent(mev.Event());
if (result != WebInputEventResult::kNotHandled)
return result;
return WebInputEventResult::kHandledSystem;
}
void EventHandler::CaptureMouseEventsToWidget(bool capture) {
if (!frame_->IsLocalRoot()) {
frame_->LocalFrameRoot().GetEventHandler().CaptureMouseEventsToWidget(
capture);
return;
}
if (capture == is_widget_capturing_mouse_events_)
return;
frame_->LocalFrameRoot().Client()->SetMouseCapture(capture);
is_widget_capturing_mouse_events_ = capture;
}
} // namespace blink