view_transition_style_tracker.h | Explore in Territory

// Copyright 2022 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_VIEW_TRANSITION_VIEW_TRANSITION_STYLE_TRACKER_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_VIEW_TRANSITION_VIEW_TRANSITION_STYLE_TRACKER_H_

#include "base/containers/flat_map.h"
#include "base/unguessable_token.h"
#include "cc/layers/view_transition_content_layer.h"
#include "components/viz/common/view_transition_element_resource_id.h"
#include "third_party/blink/public/common/frame/view_transition_state.h"
#include "third_party/blink/renderer/core/css/css_property_names.h"
#include "third_party/blink/renderer/core/css/css_rule.h"
#include "third_party/blink/renderer/core/css/style_request.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/dom/element.h"
#include "third_party/blink/renderer/core/layout/geometry/physical_rect.h"
#include "third_party/blink/renderer/core/style/style_view_transition_group.h"
#include "third_party/blink/renderer/platform/allow_discouraged_type.h"
#include "third_party/blink/renderer/platform/graphics/graphics_types.h"
#include "third_party/blink/renderer/platform/graphics/paint/effect_paint_property_node.h"
#include "third_party/blink/renderer/platform/heap/collection_support/heap_hash_map.h"
#include "third_party/blink/renderer/platform/heap/heap_traits.h"
#include "third_party/blink/renderer/platform/wtf/text/atomic_string.h"
#include "ui/gfx/geometry/transform.h"

namespace blink {

class ClipPaintPropertyNode;
class PaintLayer;
class PseudoElement;

// This class manages the integration between ViewTransition and the style
// system which encompasses the following responsibilities :
//
// 1) Triggering style invalidation to change the DOM structure at different
//    stages during a transition. For example, pseudo elements for new-content
//    are generated after the new Document has loaded and the transition can be
//    started.
//
// 2) Tracking changes in the state of transition elements that are mirrored in
//    the style for their corresponding pseudo element. For example, if a
//    transition element's size or viewport space transform is updated. This
//    data is used to generate a dynamic UA stylesheet for these pseudo
//    elements.
//
// Note: The root element is special because its responsibilities are hoisted up
// to the LayoutView. For example, the root snapshot includes content from the
// root element and top layer elements.
// See
// https://drafts.csswg.org/css-view-transitions-1/#capture-the-image-algorithm.
// We avoid leaking this detail into this class by letting higher level code
// deal with this mapping.
//
// A new instance of this class is created for every transition.
class ViewTransitionStyleTracker
    : public GarbageCollected<ViewTransitionStyleTracker> { … };

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_CORE_VIEW_TRANSITION_VIEW_TRANSITION_STYLE_TRACKER_H_
chromium/third_party/blink/renderer/core/view_transition/view_transition_style_tracker.h
