chromium/src/third_party/blink/renderer/core/html/forms/slider_thumb_element.h

/*
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 * Copyright (C) 2010 Google Inc. All rights reserved.
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#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_HTML_FORMS_SLIDER_THUMB_ELEMENT_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_HTML_FORMS_SLIDER_THUMB_ELEMENT_H_

#include "third_party/blink/renderer/core/html/html_div_element.h"
#include "third_party/blink/renderer/platform/geometry/layout_point.h"
#include "third_party/blink/renderer/platform/heap/heap.h"
#include "third_party/blink/renderer/platform/wtf/casting.h"
#include "third_party/blink/renderer/platform/wtf/forward.h"

namespace blink {

class HTMLInputElement;
class Event;
class TouchEvent;

class SliderThumbElement final : public HTMLDivElement {
 public:
  SliderThumbElement(Document&);

  void SetPositionFromValue();

  void DragFrom(const LayoutPoint&);
  void DefaultEventHandler(Event&) override;
  bool WillRespondToMouseMoveEvents() override;
  bool WillRespondToMouseClickEvents() override;
  void DetachLayoutTree(bool performing_reattach) override;
  const AtomicString& ShadowPseudoId() const override;
  HTMLInputElement* HostInput() const;
  void SetPositionFromPoint(const LayoutPoint&);
  void StopDragging();
  bool IsSliderThumbElement() const override { return true; }

 private:
  LayoutObject* CreateLayoutObject(const ComputedStyle&, LegacyLayout) override;
  scoped_refptr<ComputedStyle> CustomStyleForLayoutObject(
      const StyleRecalcContext&) final;
  Element& CloneWithoutAttributesAndChildren(Document&) const override;
  bool IsDisabledFormControl() const override;
  bool MatchesReadOnlyPseudoClass() const override;
  bool MatchesReadWritePseudoClass() const override;
  void StartDragging();

  bool
      in_drag_mode_;  // Mouse only. Touch is handled by SliderContainerElement.
};

inline Element& SliderThumbElement::CloneWithoutAttributesAndChildren(
    Document& factory) const {
  return *MakeGarbageCollected<SliderThumbElement>(factory);
}

// FIXME: There are no ways to check if a node is a SliderThumbElement.
template <>
struct DowncastTraits<SliderThumbElement> {
  static bool AllowFrom(const Node& node) { return node.IsHTMLElement(); }
};

class SliderContainerElement final : public HTMLDivElement {
 public:
  enum Direction {
    kHorizontal,
    kVertical,
    kNoMove,
  };

  explicit SliderContainerElement(Document&);

  HTMLInputElement* HostInput() const;
  void DefaultEventHandler(Event&) override;
  void HandleTouchEvent(TouchEvent*);
  void UpdateTouchEventHandlerRegistry();
  void DidMoveToNewDocument(Document&) override;
  void RemoveAllEventListeners() override;

 private:
  LayoutObject* CreateLayoutObject(const ComputedStyle&, LegacyLayout) override;
  const AtomicString& ShadowPseudoId() const override;
  Direction GetDirection(LayoutPoint&, LayoutPoint&);
  bool CanSlide();

  bool has_touch_event_handler_;
  bool touch_started_;
  Direction sliding_direction_;
  LayoutPoint start_point_;
};

}  // namespace blink

#endif