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/*
* Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
*
* 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.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_PAGE_FOCUS_CONTROLLER_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_PAGE_FOCUS_CONTROLLER_H_
#include "base/memory/scoped_refptr.h"
#include "third_party/blink/public/mojom/input/focus_type.mojom-blink-forward.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/platform/heap/collection_support/heap_hash_map.h"
#include "third_party/blink/renderer/platform/heap/collection_support/heap_hash_set.h"
#include "third_party/blink/renderer/platform/heap/garbage_collected.h"
#include "third_party/blink/renderer/platform/wtf/forward.h"
namespace blink {
struct FocusParams;
class ContainerNode;
class Document;
class Element;
class FocusChangedObserver;
class Frame;
class HTMLElement;
class HTMLFrameOwnerElement;
class InputDeviceCapabilities;
class LocalFrame;
class Page;
class RemoteFrame;
class CORE_EXPORT FocusController final
: public GarbageCollected<FocusController> {
public:
using OwnerMap = HeapHashMap<Member<ContainerNode>, Member<Element>>;
explicit FocusController(Page*);
FocusController(const FocusController&) = delete;
FocusController& operator=(const FocusController&) = delete;
void SetFocusedFrame(Frame*, bool notify_embedder = true);
void FocusDocumentView(Frame*, bool notify_embedder = true);
LocalFrame* FocusedFrame() const;
Frame* FocusedOrMainFrame() const;
// Clears |focused_frame_| if it's been detached.
void FrameDetached(Frame* detached_frame);
// Finds the focused HTMLFrameOwnerElement, if any, in the provided frame.
// An HTMLFrameOwnerElement is considered focused if the frame it owns, or
// one of its descendant frames, is currently focused.
HTMLFrameOwnerElement* FocusedFrameOwnerElement(
LocalFrame& current_frame) const;
// Determines whether the provided Document has focus according to
// http://www.w3.org/TR/html5/editing.html#dom-document-hasfocus
bool IsDocumentFocused(const Document&) const;
bool SetInitialFocus(mojom::blink::FocusType);
bool AdvanceFocus(mojom::blink::FocusType type,
InputDeviceCapabilities* source_capabilities = nullptr) {
return AdvanceFocus(type, false, source_capabilities);
}
bool AdvanceFocusAcrossFrames(
mojom::blink::FocusType,
RemoteFrame* from,
LocalFrame* to,
InputDeviceCapabilities* source_capabilities = nullptr);
static Element* FindFocusableElementInShadowHost(const Element& shadow_host);
static HTMLElement* FindScopeOwnerSlotOrReadingFlowContainer(const Element&);
// Returns the next focusable element (likely an <input> field) after the
// given element in focus traversal and within the enclosing <form> that
// requires user input before submitting the form (all <form>less <input>s are
// considered as one virtual form). Used by an Android virtual keyboard and
// Autofill to infer whether the enclosing <form> is ready for auto-submission
// after filling the given element or focus should be firstly moved to the
// next focusable element.
Element* NextFocusableElementForImeAndAutofill(Element*,
mojom::blink::FocusType);
Element* FindFocusableElementForImeAutofillAndTesting(mojom::blink::FocusType,
Element&,
OwnerMap&);
bool SetFocusedElement(Element*, Frame*, const FocusParams&);
// |setFocusedElement| variant with SelectionBehaviorOnFocus::None,
// |kFocusTypeNone, and null InputDeviceCapabilities.
bool SetFocusedElement(Element*, Frame*);
void SetActive(bool);
bool IsActive() const { return is_active_ || is_emulating_focus_; }
void SetFocused(bool);
bool IsFocused() const { return is_focused_ || is_emulating_focus_; }
void SetFocusEmulationEnabled(bool);
void RegisterFocusChangedObserver(FocusChangedObserver*);
static int AdjustedTabIndex(const Element&);
void Trace(Visitor*) const;
private:
bool AdvanceFocus(mojom::blink::FocusType,
bool initial_focus,
InputDeviceCapabilities* source_capabilities = nullptr);
bool AdvanceFocusInDocumentOrder(
LocalFrame*,
Element* start,
mojom::blink::FocusType,
bool initial_focus,
InputDeviceCapabilities* source_capabilities);
void NotifyFocusChangedObservers() const;
void ActiveHasChanged();
void FocusHasChanged();
Member<Page> page_;
Member<Frame> focused_frame_;
bool is_active_;
bool is_focused_;
bool is_changing_focused_frame_;
bool is_emulating_focus_;
HeapHashSet<WeakMember<FocusChangedObserver>> focus_changed_observers_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_PAGE_FOCUS_CONTROLLER_H_
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