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/*
* Copyright (C) 2007, 2009 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_DRAG_CONTROLLER_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_PAGE_DRAG_CONTROLLER_H_
#include <optional>
#include "third_party/blink/public/common/input/pointer_id.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/dom/events/event_target.h"
#include "third_party/blink/renderer/core/execution_context/execution_context_lifecycle_observer.h"
#include "third_party/blink/renderer/core/page/drag_actions.h"
#include "third_party/blink/renderer/platform/heap/garbage_collected.h"
#include "third_party/blink/renderer/platform/weborigin/kurl.h"
#include "third_party/blink/renderer/platform/wtf/forward.h"
#include "ui/base/dragdrop/mojom/drag_drop_types.mojom-blink.h"
#include "ui/gfx/geometry/point.h"
#include "ui/gfx/geometry/rect.h"
namespace gfx {
class RectF;
}
namespace blink {
class DataTransfer;
class Document;
class DragData;
class DragImage;
class DragState;
class LocalFrame;
class FrameSelection;
class HTMLInputElement;
class Node;
class Page;
class WebMouseEvent;
class CORE_EXPORT DragController final
: public GarbageCollected<DragController>,
public ExecutionContextLifecycleObserver {
public:
explicit DragController(Page*);
DragController(const DragController&) = delete;
DragController& operator=(const DragController&) = delete;
// Holds the drag operation and whether the document is handling it. Also see
// DragTargetDragEnter() in widget.mojom for further details.
struct Operation {
// The current drag operation as negotiated by the source and destination.
// When not equal to DragOperationNone, the drag data can be dropped onto
// the current drop target in this WebView (the drop target can accept the
// drop).
ui::mojom::blink::DragOperation operation =
ui::mojom::blink::DragOperation::kNone;
// True if the document intends to handle the drag. This means the drag
// controller will pass the data to the document, but the document might
// still decide not to handle it by not calling preventDefault().
bool document_is_handling_drag = false;
};
Operation DragEnteredOrUpdated(DragData*, LocalFrame& local_root);
void DragExited(DragData*, LocalFrame& local_root);
void PerformDrag(DragData*, LocalFrame& local_root);
enum SelectionDragPolicy {
kImmediateSelectionDragResolution,
kDelayedSelectionDragResolution,
};
Node* DraggableNode(const LocalFrame*,
Node*,
const gfx::Point&,
SelectionDragPolicy,
DragSourceAction&) const;
void DragEnded();
bool PopulateDragDataTransfer(LocalFrame* src,
const DragState&,
const gfx::Point& drag_origin);
// The parameter `drag_event` is the event that triggered the drag operation,
// and `drag_initiation_location` is the where the drag originated. The
// event's location does NOT match the initiation location for a mouse-drag:
// the drag is triggered by a mouse-move event but the initiation location is
// that of a mouse-down event.
bool StartDrag(LocalFrame*,
const DragState&,
const WebMouseEvent& drag_event,
const gfx::Point& drag_initiation_location);
DragState& GetDragState();
static std::unique_ptr<DragImage> DragImageForSelection(LocalFrame&, float);
// Return the selection bounds in absolute coordinates for the frame, clipped
// to the visual viewport.
static gfx::RectF ClippedSelection(const LocalFrame&);
// ExecutionContextLifecycleObserver.
void ContextDestroyed() final;
void Trace(Visitor*) const final;
std::optional<PointerId> drag_pointer_id() const { return drag_pointer_id_; }
private:
DispatchEventResult DispatchTextInputEventFor(LocalFrame*, DragData*);
bool CanProcessDrag(DragData*, LocalFrame& local_root);
bool ConcludeEditDrag(DragData*);
ui::mojom::blink::DragOperation OperationForLoad(DragData*,
LocalFrame& local_root);
bool TryDocumentDrag(DragData*,
DragDestinationAction,
ui::mojom::blink::DragOperation&,
LocalFrame& local_root);
bool TryDHTMLDrag(DragData*,
ui::mojom::blink::DragOperation&,
LocalFrame& local_root);
ui::mojom::blink::DragOperation GetDragOperation(DragData*);
// Clear the selection from the document this drag is exiting.
void ClearDragCaret();
bool DragIsMove(FrameSelection&, DragData*);
bool IsCopyKeyDown(DragData*);
void MouseMovedIntoDocument(Document*);
void DoSystemDrag(DragImage*,
const gfx::Rect& drag_obj_rect,
const gfx::Point& drag_initiation_location,
DataTransfer*,
LocalFrame*);
Member<Page> page_;
// The document the mouse was last dragged over.
Member<Document> document_under_mouse_;
// The window (if any) that initiated the drag.
Member<LocalDOMWindow> drag_initiator_;
Member<DragState> drag_state_;
Member<HTMLInputElement> file_input_element_under_mouse_;
bool document_is_handling_drag_;
DragDestinationAction drag_destination_action_;
bool did_initiate_drag_;
// Used to set the correct pointer id to synthetic events. Principally added
// to track touch drag and drop when `TouchDragEndContextMenu` is enabled.
std::optional<PointerId> drag_pointer_id_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_PAGE_DRAG_CONTROLLER_H_
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