chromium/third_party/blink/renderer/core/frame/rotation_viewport_anchor.h

// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_ROTATION_VIEWPORT_ANCHOR_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_ROTATION_VIEWPORT_ANCHOR_H_

#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/layout/geometry/physical_rect.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "ui/gfx/geometry/point.h"
#include "ui/gfx/geometry/point_f.h"
#include "ui/gfx/geometry/size_f.h"
#include "ui/gfx/geometry/vector2d_f.h"

namespace blink {

class LocalFrameView;
class Node;
class PageScaleConstraintsSet;
class ScrollableArea;
class VisualViewport;

// The rotation anchor provides a way to anchor a viewport origin to a DOM node.
// In particular, the user supplies an anchor point (in view coordinates, e.g.,
// (0, 0) == viewport origin, (0.5, 0) == viewport top center). The anchor point
// tracks the underlying DOM node; as the node moves or the view is resized, the
// viewport anchor maintains its orientation relative to the node, and the
// viewport origin maintains its orientation relative to the anchor. If there is
// no node or it is lost during the resize, we fall back to the resize anchor
// logic.
class CORE_EXPORT RotationViewportAnchor { … };

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_ROTATION_VIEWPORT_ANCHOR_H_