Media Controls: move timeline related code to modules.

third_party/WebKit/Source/modules/media_controls/elements/MediaControlTimelineElement.cpp

+// Copyright 2017 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 "modules/media_controls/elements/MediaControlTimelineElement.h"
+
+#include "core/HTMLNames.h"
+#include "core/InputTypeNames.h"
+#include "core/events/Event.h"
+#include "core/events/KeyboardEvent.h"
+#include "core/events/MouseEvent.h"
+#include "core/events/PointerEvent.h"
+#include "core/html/HTMLMediaElement.h"
+#include "core/html/TimeRanges.h"
+#include "core/html/shadow/ShadowElementNames.h"
+#include "core/layout/LayoutBoxModelObject.h"
+#include "core/page/ChromeClient.h"
+#include "modules/media_controls/MediaControlsImpl.h"
+#include "modules/media_controls/elements/MediaControlElementsHelper.h"
+#include "public/platform/Platform.h"
+#include "public/platform/WebScreenInfo.h"
+
+namespace blink {
+
+MediaControlTimelineElement::MediaControlTimelineElement(
+    MediaControlsImpl& media_controls)
+    : MediaControlInputElement(media_controls, kMediaSlider) {
+  EnsureUserAgentShadowRoot();
+  setType(InputTypeNames::range);
+  setAttribute(HTMLNames::stepAttr, "any");
+  SetShadowPseudoId(AtomicString("-webkit-media-controls-timeline"));
+}
+
+bool MediaControlTimelineElement::WillRespondToMouseClickEvents() {
+  return isConnected() && GetDocument().IsActive();
+}
+
+void MediaControlTimelineElement::SetPosition(double current_time) {
+  setValue(String::Number(current_time));
+
+  if (LayoutObject* layout_object = this->GetLayoutObject())
+    layout_object->SetShouldDoFullPaintInvalidation();
+}
+
+void MediaControlTimelineElement::SetDuration(double duration) {
+  SetFloatingPointAttribute(HTMLNames::maxAttr,
+                            std::isfinite(duration) ? duration : 0);
+
+  if (LayoutObject* layout_object = this->GetLayoutObject())
+    layout_object->SetShouldDoFullPaintInvalidation();
+}
+
+void MediaControlTimelineElement::OnPlaying() {
+  Frame* frame = GetDocument().GetFrame();
+  if (!frame)
+    return;
+  metrics_.RecordPlaying(
+      frame->GetChromeClient().GetScreenInfo().orientation_type,
+      MediaElement().IsFullscreen(), TimelineWidth());
+}
+
+void MediaControlTimelineElement::DefaultEventHandler(Event* event) {

[Zhiqiang Zhang (Slow), 2017/04/20 10:56:34]

I know this method is old code, but it seems too long to read, especially the
UMA code is everywhere. Maybe we could split it in the future for better
readability.

[mlamouri (slow - plz ping), 2017/04/20 14:17:20]

I agree that this could be improved. Hopefully, we will drop the metrics when we
rewrite the timeline.

+  if (event->IsMouseEvent() &&
+      ToMouseEvent(event)->button() !=
+          static_cast<short>(WebPointerProperties::Button::kLeft))
+    return;
+
+  if (!isConnected() || !GetDocument().IsActive())
+    return;
+
+  // TODO(crbug.com/706504): These should listen for pointerdown/up.
+  if (event->type() == EventTypeNames::mousedown)
+    static_cast<MediaControlsImpl&>(GetMediaControls()).BeginScrubbing();
+  if (event->type() == EventTypeNames::mouseup)
+    static_cast<MediaControlsImpl&>(GetMediaControls()).EndScrubbing();
+
+  // Only respond to main button of primary pointer(s).
+  if (event->IsPointerEvent() && ToPointerEvent(event)->isPrimary() &&
+      ToPointerEvent(event)->button() ==
+          static_cast<short>(WebPointerProperties::Button::kLeft)) {
+    if (event->type() == EventTypeNames::pointerdown) {
+      Platform::Current()->RecordAction(
+          UserMetricsAction("Media.Controls.ScrubbingBegin"));
+      static_cast<MediaControlsImpl&>(GetMediaControls()).BeginScrubbing();
+      Element* thumb = UserAgentShadowRoot()->GetElementById(
+          ShadowElementNames::SliderThumb());
+      bool started_from_thumb = thumb && thumb == event->target()->ToNode();
+      metrics_.StartGesture(started_from_thumb);
+    }
+    if (event->type() == EventTypeNames::pointerup) {
+      Platform::Current()->RecordAction(
+          UserMetricsAction("Media.Controls.ScrubbingEnd"));
+      static_cast<MediaControlsImpl&>(GetMediaControls()).EndScrubbing();
+      metrics_.RecordEndGesture(TimelineWidth(), MediaElement().duration());
+    }
+  }
+
+  if (event->type() == EventTypeNames::keydown) {
+    metrics_.StartKey();
+  }
+  if (event->type() == EventTypeNames::keyup && event->IsKeyboardEvent()) {
+    metrics_.RecordEndKey(TimelineWidth(), ToKeyboardEvent(event)->keyCode());
+  }
+
+  MediaControlInputElement::DefaultEventHandler(event);
+
+  if (event->type() != EventTypeNames::input)
+    return;
+
+  double time = value().ToDouble();
+
+  double duration = MediaElement().duration();
+  // Workaround for floating point error - it's possible for this element's max
+  // attribute to be rounded to a value slightly higher than the duration. If
+  // this happens and scrubber is dragged near the max, seek to duration.
+  if (time > duration)
+    time = duration;
+
+  metrics_.OnInput(MediaElement().currentTime(), time);
+
+  // FIXME: This will need to take the timeline offset into consideration
+  // once that concept is supported, see https://crbug.com/312699
+  if (MediaElement().seekable()->Contain(time))
+    MediaElement().setCurrentTime(time);
+
+  // Provide immediate feedback (without waiting for media to seek) to make it
+  // easier for user to seek to a precise time.
+  static_cast<MediaControlsImpl&>(GetMediaControls())
+      .UpdateCurrentTimeDisplay();
+}
+
+bool MediaControlTimelineElement::KeepEventInNode(Event* event) {
+  return MediaControlElementsHelper::IsUserInteractionEventForSlider(
+      event, GetLayoutObject());
+}
+
+int MediaControlTimelineElement::TimelineWidth() {
+  if (LayoutBoxModelObject* box = GetLayoutBoxModelObject())
+    return box->OffsetWidth().Round();
+  return 0;
+}
+
+}  // namespace blink