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// Copyright 2015 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.
#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/platform/geometry/float_size.h"
#include "third_party/blink/renderer/platform/geometry/int_point.h"
#include "third_party/blink/renderer/platform/geometry/int_rect.h"
#include "third_party/blink/renderer/platform/geometry/layout_rect.h"
#include "third_party/blink/renderer/platform/heap/handle.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 {
STACK_ALLOCATED();
public:
RotationViewportAnchor(LocalFrameView& root_frame_view,
VisualViewport&,
const FloatSize& anchor_in_inner_view_coords,
PageScaleConstraintsSet&);
~RotationViewportAnchor();
private:
void SetAnchor();
void RestoreToAnchor();
FloatPoint GetInnerOrigin(const FloatSize& inner_size) const;
void ComputeOrigins(const FloatSize& inner_size,
IntPoint& main_frame_offset,
FloatPoint& visual_viewport_offset) const;
ScrollableArea& LayoutViewport() const;
Member<LocalFrameView> root_frame_view_;
Member<VisualViewport> visual_viewport_;
float old_page_scale_factor_;
float old_minimum_page_scale_factor_;
// Inner viewport origin in the reference frame of the document in CSS pixels
FloatPoint visual_viewport_in_document_;
// Inner viewport origin in the reference frame of the outer viewport
// normalized to the outer viewport size.
FloatSize normalized_visual_viewport_offset_;
Member<Node> anchor_node_;
// In Document coordinates.
LayoutRect anchor_node_bounds_;
FloatSize anchor_in_inner_view_coords_;
FloatSize anchor_in_node_coords_;
Member<PageScaleConstraintsSet> page_scale_constraints_set_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_ROTATION_VIEWPORT_ANCHOR_H_
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