Radix cross Linux

Index: ui/views/animation/ink_drop_host.h
===================================================================
--- ui/views/animation/ink_drop_host.h	(nonexistent)
+++ ui/views/animation/ink_drop_host.h	(revision 371)
@@ -0,0 +1,299 @@
+// Copyright 2016 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef UI_VIEWS_ANIMATION_INK_DROP_HOST_H_
+#define UI_VIEWS_ANIMATION_INK_DROP_HOST_H_
+
+#include <memory>
+
+#include "base/memory/raw_ptr.h"
+#include "third_party/abseil-cpp/absl/types/variant.h"
+#include "third_party/skia/include/core/SkColor.h"
+#include "ui/color/color_id.h"
+#include "ui/color/color_provider.h"
+#include "ui/gfx/color_palette.h"
+#include "ui/gfx/geometry/point.h"
+#include "ui/gfx/geometry/size.h"
+#include "ui/views/animation/ink_drop_event_handler.h"
+#include "ui/views/metadata/view_factory.h"
+#include "ui/views/view.h"
+
+namespace ui {
+class Layer;
+class LocatedEvent;
+}  // namespace ui
+
+namespace views {
+
+class InkDrop;
+class InkDropHighlight;
+class InkDropImpl;
+class InkDropMask;
+class InkDropRipple;
+enum class InkDropState;
+
+namespace test {
+class InkDropHostTestApi;
+}  // namespace test
+
+// TODO(crbug.com/931964): Rename this type and move this header. Also consider
+// if InkDropHost should be what implements the InkDrop interface and have that
+// be the public interface.
+// The current division of labor is roughly as follows:
+// * InkDropHost manages an InkDrop and is responsible for a lot of its
+//   configuration and creating the parts of the InkDrop.
+// * InkDrop manages the parts of the ink-drop effect once it's up and running.
+// * InkDropRipple is a ripple effect that usually triggers as a result of
+//   clicking or activating the button / similar which hosts this.
+// * InkDropHighlight manages the hover/focus highlight layer.
+// TODO(pbos): See if this can be the only externally visible surface for an
+// ink-drop effect, and rename this InkDrop, or consolidate with InkDrop.
+class VIEWS_EXPORT InkDropHost {
+ public:
+  // Used in SetMode() to specify whether the ink drop effect is enabled
+  // or not for the view. In case of having an ink drop, it also specifies
+  // whether the default event handler for the ink drop should be installed or
+  // the subclass will handle ink drop events itself.
+  enum class InkDropMode {
+    OFF,
+    ON,
+    ON_NO_GESTURE_HANDLER,
+    ON_NO_ANIMATE,
+  };
+
+  explicit InkDropHost(View* host);
+  InkDropHost(const InkDropHost&) = delete;
+  InkDropHost& operator=(const InkDropHost&) = delete;
+  virtual ~InkDropHost();
+
+  // Returns a configured InkDrop. To override default behavior call
+  // SetCreateInkDropCallback().
+  std::unique_ptr<InkDrop> CreateInkDrop();
+
+  // Replace CreateInkDrop() behavior.
+  void SetCreateInkDropCallback(
+      base::RepeatingCallback<std::unique_ptr<InkDrop>()> callback);
+
+  // Creates and returns the visual effect used for press. Used by InkDropImpl
+  // instances.
+  std::unique_ptr<InkDropRipple> CreateInkDropRipple() const;
+
+  // Replaces CreateInkDropRipple() behavior.
+  void SetCreateRippleCallback(
+      base::RepeatingCallback<std::unique_ptr<InkDropRipple>()> callback);
+
+  // Returns the point of the |last_ripple_triggering_event_| if it was a
+  // LocatedEvent, otherwise the center point of the local bounds is returned.
+  // This is nominally used by the InkDropRipple.
+  gfx::Point GetInkDropCenterBasedOnLastEvent() const;
+
+  // Creates and returns the visual effect used for hover and focus. Used by
+  // InkDropImpl instances. To override behavior call
+  // SetCreateHighlightCallback().
+  std::unique_ptr<InkDropHighlight> CreateInkDropHighlight() const;
+
+  // Replaces CreateInkDropHighlight() behavior.
+  void SetCreateHighlightCallback(
+      base::RepeatingCallback<std::unique_ptr<InkDropHighlight>()> callback);
+
+  // Callback replacement of CreateInkDropMask().
+  // TODO(pbos): Investigate removing this. It currently is only used by
+  // PieMenuView.
+  void SetCreateMaskCallback(
+      base::RepeatingCallback<std::unique_ptr<InkDropMask>()> callback);
+
+  // Toggles ink drop attention state on/off. If set on, a pulsing highlight
+  // is shown, prompting users to interact with `host_view_`.
+  // Called by components that want to call into user's attention, e.g. IPH.
+  void ToggleAttentionState(bool attention_on);
+
+  // Returns the base color for the ink drop.
+  SkColor GetBaseColor() const;
+
+  // Sets the base color of the ink drop. If `SetBaseColor` is called, the
+  // effect of previous calls to `SetBaseColorId` and `SetBaseColorCallback` is
+  // overwritten and vice versa.
+  // TODO(crbug.com/1341361): Replace SetBaseColor with SetBaseColorId.
+  void SetBaseColor(SkColor color);
+  void SetBaseColorId(ui::ColorId color_id);
+  // Callback version of `GetBaseColor`. If possible, prefer using
+  // `SetBaseColor` or `SetBaseColorId`.
+  void SetBaseColorCallback(base::RepeatingCallback<SkColor()> callback);
+
+  // Toggle to enable/disable an InkDrop on this View.  Descendants can override
+  // CreateInkDropHighlight() and CreateInkDropRipple() to change the look/feel
+  // of the InkDrop.
+  //
+  // TODO(bruthig): Add an easier mechanism than overriding functions to allow
+  // subclasses/clients to specify the flavor of ink drop.
+  void SetMode(InkDropMode ink_drop_mode);
+  InkDropMode GetMode() const;
+
+  // Set whether the ink drop layers should be placed into the region above or
+  // below the view layer. The default is kBelow;
+  void SetLayerRegion(LayerRegion region);
+  LayerRegion GetLayerRegion() const;
+
+  void SetVisibleOpacity(float visible_opacity);
+  float GetVisibleOpacity() const;
+
+  void SetHighlightOpacity(absl::optional<float> opacity);
+
+  void SetSmallCornerRadius(int small_radius);
+  int GetSmallCornerRadius() const;
+
+  void SetLargeCornerRadius(int large_radius);
+  int GetLargeCornerRadius() const;
+
+  // Animates |ink_drop_| to the desired |ink_drop_state|. Caches |event| as the
+  // last_ripple_triggering_event().
+  //
+  // *** NOTE ***: |event| has been plumbed through on a best effort basis for
+  // the purposes of centering ink drop ripples on located Events.  Thus nullptr
+  // has been used by clients who do not have an Event instance available to
+  // them.
+  void AnimateToState(InkDropState state, const ui::LocatedEvent* event);
+
+  // Returns true if an ink drop instance has been created.
+  bool HasInkDrop() const;
+
+  // Provides public access to |ink_drop_| so that factory methods can configure
+  // the inkdrop. Implements lazy initialization of |ink_drop_| so as to avoid
+  // virtual method calls during construction since subclasses should be able to
+  // call SetMode() during construction.
+  InkDrop* GetInkDrop();
+
+  // Returns whether the ink drop should be considered "highlighted" (in or
+  // animating into "highlight visible" steady state).
+  bool GetHighlighted() const;
+
+  base::CallbackListSubscription AddHighlightedChangedCallback(
+      base::RepeatingClosure callback);
+
+  // Should be called by InkDrop implementations when their highlight state
+  // changes, to trigger the corresponding property change notification here.
+  void OnInkDropHighlightedChanged();
+
+  // Methods called by InkDrop for attaching its layer.
+  // TODO(pbos): Investigate using direct calls on View::AddLayerToRegion.
+  void AddInkDropLayer(ui::Layer* ink_drop_layer);
+  void RemoveInkDropLayer(ui::Layer* ink_drop_layer);
+
+  // Size used by default for the SquareInkDropRipple.
+  static constexpr gfx::Size kDefaultSquareInkDropSize = gfx::Size(24, 24);
+
+  // Returns a large scaled size used by SquareInkDropRipple and Highlight.
+  static gfx::Size GetLargeSize(gfx::Size small_size);
+
+  // Creates a SquareInkDropRipple centered on |center_point|.
+  std::unique_ptr<InkDropRipple> CreateSquareRipple(
+      const gfx::Point& center_point,
+      const gfx::Size& size = kDefaultSquareInkDropSize) const;
+
+  View* host_view() { return host_view_; }
+  const View* host_view() const { return host_view_; }
+
+ private:
+  friend class test::InkDropHostTestApi;
+
+  class ViewLayerTransformObserver : public ViewObserver {
+   public:
+    ViewLayerTransformObserver(InkDropHost* ink_drop_host, View* host);
+    ~ViewLayerTransformObserver() override;
+
+    void OnViewLayerTransformed(View* observed_view) override;
+
+   private:
+    base::ScopedObservation<View, ViewObserver> observation_{this};
+    const raw_ptr<InkDropHost> ink_drop_host_;
+  };
+
+  class InkDropHostEventHandlerDelegate : public InkDropEventHandler::Delegate {
+   public:
+    explicit InkDropHostEventHandlerDelegate(InkDropHost* host);
+
+    // InkDropEventHandler::Delegate:
+    InkDrop* GetInkDrop() override;
+    bool HasInkDrop() const override;
+
+    bool SupportsGestureEvents() const override;
+
+   private:
+    // The host.
+    const raw_ptr<InkDropHost> ink_drop_host_;
+  };
+
+  const InkDropEventHandler* GetEventHandler() const;
+  InkDropEventHandler* GetEventHandler();
+
+  // This generates a mask for the InkDrop.
+  std::unique_ptr<views::InkDropMask> CreateInkDropMask() const;
+
+  // Adds a clip rect on the root layer of the ink drop impl. This is a more
+  // performant alternative to using circles or rectangle mask layers. Returns
+  // true if a clip was added.
+  bool AddInkDropClip(ui::Layer* ink_drop_layer);
+
+  // Initializes and sets a mask on `ink_drop_layer`. This will not run if
+  // AddInkDropClip() succeeds in the default implementation of
+  // AddInkDropLayer().
+  void InstallInkDropMask(ui::Layer* ink_drop_layer);
+
+  const raw_ptr<View> host_view_;
+
+  // Defines what type of |ink_drop_| to create.
+  InkDropMode ink_drop_mode_ = views::InkDropHost::InkDropMode::OFF;
+
+  // Into which region should the ink drop layers be placed.
+  LayerRegion layer_region_ = LayerRegion::kBelow;
+
+  // Used to observe View and inform the InkDrop of host-transform changes.
+  ViewLayerTransformObserver host_view_transform_observer_;
+
+  // Should not be accessed directly. Use GetInkDrop() instead.
+  std::unique_ptr<InkDrop> ink_drop_;
+
+  // Intentionally declared after |ink_drop_| so that it doesn't access a
+  // destroyed |ink_drop_| during destruction.
+  InkDropHostEventHandlerDelegate ink_drop_event_handler_delegate_;
+  InkDropEventHandler ink_drop_event_handler_;
+
+  float ink_drop_visible_opacity_ = 0.175f;
+
+  // The color of the ripple and hover.
+  absl::variant<SkColor, ui::ColorId, base::RepeatingCallback<SkColor()>>
+      ink_drop_base_color_ = gfx::kPlaceholderColor;
+
+  // TODO(pbos): Audit call sites to make sure highlight opacity is either
+  // always set or using the default value. Then make this a non-optional float.
+  absl::optional<float> ink_drop_highlight_opacity_;
+
+  // Radii used for the SquareInkDropRipple.
+  int ink_drop_small_corner_radius_ = 2;
+  int ink_drop_large_corner_radius_ = 4;
+
+  std::unique_ptr<views::InkDropMask> ink_drop_mask_;
+
+  base::RepeatingCallback<std::unique_ptr<InkDrop>()> create_ink_drop_callback_;
+  base::RepeatingCallback<std::unique_ptr<InkDropRipple>()>
+      create_ink_drop_ripple_callback_;
+  base::RepeatingCallback<std::unique_ptr<InkDropHighlight>()>
+      create_ink_drop_highlight_callback_;
+
+  base::RepeatingCallback<std::unique_ptr<InkDropMask>()>
+      create_ink_drop_mask_callback_;
+
+  base::RepeatingClosureList highlighted_changed_callbacks_;
+
+  // Attention is a state we apply on Buttons' ink drop when we want to draw
+  // users' attention to this button and prompt users' interaction.
+  // It consists of two visual effects: a default light blue color and a pulsing
+  // effect. Current use case is IPH. Go to chrome://internals/user-education
+  // and press e.g. IPH_TabSearch to see the effects.
+  bool in_attention_state_ = false;
+};
+
+}  // namespace views
+
+#endif  // UI_VIEWS_ANIMATION_INK_DROP_HOST_H_