chrome/browser/ui/views/location_bar/icon_label_bubble_view.cc

// Copyright (c) 2012 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.

#include "chrome/browser/ui/views/location_bar/icon_label_bubble_view.h"

#include <algorithm>
#include <memory>
#include <utility>

#include "chrome/browser/ui/layout_constants.h"
#include "chrome/browser/ui/omnibox/omnibox_theme.h"
#include "ui/accessibility/ax_node_data.h"
#include "ui/base/l10n/l10n_util.h"
#include "ui/compositor/layer_animator.h"
#include "ui/compositor/scoped_layer_animation_settings.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/geometry/insets.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/scoped_canvas.h"
#include "ui/gfx/skia_util.h"
#include "ui/views/accessibility/ax_virtual_view.h"
#include "ui/views/accessibility/view_accessibility.h"
#include "ui/views/animation/flood_fill_ink_drop_ripple.h"
#include "ui/views/animation/ink_drop_highlight.h"
#include "ui/views/animation/ink_drop_impl.h"
#include "ui/views/animation/ink_drop_mask.h"
#include "ui/views/animation/ink_drop_ripple.h"
#include "ui/views/background.h"
#include "ui/views/border.h"
#include "ui/views/controls/highlight_path_generator.h"
#include "ui/views/controls/image_view.h"
#include "ui/views/widget/widget.h"

namespace {

// Amount of space reserved for the separator that appears after the icon or
// label.
constexpr int kIconLabelBubbleSeparatorWidth = 1;

// Amount of space on either side of the separator that appears after the icon
// or label.
constexpr int kIconLabelBubbleSpaceBesideSeparator = 8;

// The length of the separator's fade animation. These values are empirical.
constexpr int kIconLabelBubbleFadeInDurationMs = 250;
constexpr int kIconLabelBubbleFadeOutDurationMs = 175;

}  // namespace

SkColor IconLabelBubbleView::Delegate::GetIconLabelBubbleInkDropColor() const {
  return GetIconLabelBubbleSurroundingForegroundColor();
}

IconLabelBubbleView::SeparatorView::SeparatorView(IconLabelBubbleView* owner) {
  DCHECK(owner);
  owner_ = owner;

  SetPaintToLayer();
  layer()->SetFillsBoundsOpaquely(false);
}

void IconLabelBubbleView::SeparatorView::OnPaint(gfx::Canvas* canvas) {
  // This uses the surrounding context as the base color instead of
  // IconLabelBubbleView::GetForegroundColor() so that if the
  // IconLabelBubbleView has been emphasized (e.g. red text for a security
  // error) the separator will still blend into the background.
  const SkColor separator_color = SkColorSetA(
      owner_->delegate_->GetIconLabelBubbleSurroundingForegroundColor(), 0x69);
  const float x = GetLocalBounds().right() -
                  owner_->GetEndPaddingWithSeparator() -
                  1.0f / canvas->image_scale();
  canvas->DrawLine(gfx::PointF(x, GetLocalBounds().y()),
                   gfx::PointF(x, GetLocalBounds().bottom()), separator_color);
}

void IconLabelBubbleView::SeparatorView::OnThemeChanged() {
  views::View::OnThemeChanged();
  SchedulePaint();
}

void IconLabelBubbleView::SeparatorView::UpdateOpacity() {
  if (!GetVisible())
    return;

  // When using focus rings are visible we should hide the separator instantly
  // when the IconLabelBubbleView is focused. Otherwise we should follow the
  // inkdrop.
  if (owner_->focus_ring() && owner_->HasFocus()) {
    layer()->SetOpacity(0.0f);
    return;
  }

  views::InkDrop* ink_drop = owner_->GetInkDrop();
  DCHECK(ink_drop);

  // If an inkdrop highlight or ripple is animating in or visible, the
  // separator should fade out.
  views::InkDropState state = ink_drop->GetTargetInkDropState();
  float opacity = 0.0f;
  float duration = kIconLabelBubbleFadeOutDurationMs;
  if (!ink_drop->IsHighlightFadingInOrVisible() &&
      (state == views::InkDropState::HIDDEN ||
       state == views::InkDropState::ACTION_TRIGGERED ||
       state == views::InkDropState::DEACTIVATED)) {
    opacity = 1.0f;
    duration = kIconLabelBubbleFadeInDurationMs;
  }

  ui::ScopedLayerAnimationSettings animation(layer()->GetAnimator());
  animation.SetTransitionDuration(base::TimeDelta::FromMilliseconds(duration));
  animation.SetTweenType(gfx::Tween::Type::EASE_IN);
  layer()->SetOpacity(opacity);
}

class IconLabelBubbleView::HighlightPathGenerator
    : public views::HighlightPathGenerator {
 public:
  HighlightPathGenerator() = default;

  // views::HighlightPathGenerator:
  SkPath GetHighlightPath(const views::View* view) override {
    return static_cast<const IconLabelBubbleView*>(view)->GetHighlightPath();
  }

 private:
  DISALLOW_COPY_AND_ASSIGN(HighlightPathGenerator);
};

IconLabelBubbleView::IconLabelBubbleView(const gfx::FontList& font_list,
                                         Delegate* delegate)
    : LabelButton(nullptr, base::string16()),
      delegate_(delegate),
      separator_view_(new SeparatorView(this)) {
  DCHECK(delegate_);

  SetFontList(font_list);
  SetHorizontalAlignment(gfx::ALIGN_LEFT);

  separator_view_->SetVisible(ShouldShowSeparator());
  AddChildView(separator_view_);

  set_ink_drop_visible_opacity(
      GetOmniboxStateOpacity(OmniboxPartState::SELECTED));
  set_ink_drop_highlight_opacity(
      GetOmniboxStateOpacity(OmniboxPartState::HOVERED));

  views::HighlightPathGenerator::Install(
      this, std::make_unique<HighlightPathGenerator>());

  UpdateBorder();

  set_notify_enter_exit_on_child(true);

  // Flip the canvas in RTL so the separator is drawn on the correct side.
  separator_view_->EnableCanvasFlippingForRTLUI(true);

  auto alert_view = std::make_unique<views::AXVirtualView>();
  alert_view->GetCustomData().role = ax::mojom::Role::kAlert;
  alert_virtual_view_ = alert_view.get();
  GetViewAccessibility().AddVirtualChildView(std::move(alert_view));
}

IconLabelBubbleView::~IconLabelBubbleView() {}

void IconLabelBubbleView::InkDropAnimationStarted() {
  separator_view_->UpdateOpacity();
}

void IconLabelBubbleView::InkDropRippleAnimationEnded(
    views::InkDropState state) {}

bool IconLabelBubbleView::ShouldShowLabel() const {
  if (slide_animation_.is_animating() || is_animation_paused_)
    return !IsShrinking() || (width() > image()->GetPreferredSize().width());
  return label()->GetVisible() && !label()->GetText().empty();
}

void IconLabelBubbleView::SetLabel(const base::string16& label_text) {
  SetAccessibleName(label_text);
  label()->SetText(label_text);
  separator_view_->SetVisible(ShouldShowSeparator());
  separator_view_->UpdateOpacity();
}

void IconLabelBubbleView::SetFontList(const gfx::FontList& font_list) {
  label()->SetFontList(font_list);
}

SkColor IconLabelBubbleView::GetForegroundColor() const {
  return delegate_->GetIconLabelBubbleSurroundingForegroundColor();
}

void IconLabelBubbleView::UpdateLabelColors() {
  SetEnabledTextColors(GetForegroundColor());
  label()->SetBackgroundColor(delegate_->GetIconLabelBubbleBackgroundColor());
}

bool IconLabelBubbleView::ShouldShowSeparator() const {
  return ShouldShowLabel();
}

int IconLabelBubbleView::GetWidthBetween(int min, int max) const {
  // TODO(https://crbug.com/8944): Disable animations globally instead of having
  // piecemeal opt ins for respecting prefers reduced motion.
  if (gfx::Animation::PrefersReducedMotion())
    return max;

  if (!slide_animation_.is_animating() && !is_animation_paused_)
    return max;

  double progress = is_animation_paused_ ? pause_animation_state_
                                         : slide_animation_.GetCurrentValue();
  // This tween matches the default for SlideAnimation.
  const gfx::Tween::Type kTween = gfx::Tween::EASE_OUT;
  if (progress < open_state_fraction_) {
    double state =
        gfx::Tween::CalculateValue(kTween, progress / open_state_fraction_);
    return gfx::Tween::IntValueBetween(state, min, max);
  }

  if (progress <= (1 - open_state_fraction_))
    return max;

  double state = gfx::Tween::CalculateValue(
      kTween, (progress - (1 - open_state_fraction_)) / open_state_fraction_);
  // Note |min| and |max| are reversed.
  return gfx::Tween::IntValueBetween(state, max, min);
}

bool IconLabelBubbleView::IsShrinking() const {
  if (!slide_animation_.is_animating() || is_animation_paused_)
    return false;
  return slide_animation_.IsClosing() ||
         (open_state_fraction_ < 1.0 &&
          slide_animation_.GetCurrentValue() > (1.0 - open_state_fraction_));
}

bool IconLabelBubbleView::ShowBubble(const ui::Event& event) {
  return false;
}

bool IconLabelBubbleView::IsBubbleShowing() const {
  return false;
}

void IconLabelBubbleView::OnTouchUiChanged() {
  UpdateBorder();

  // PreferredSizeChanged() incurs an expensive layout of the location bar, so
  // only call it when this view is showing.
  if (GetVisible())
    PreferredSizeChanged();
}

gfx::Size IconLabelBubbleView::CalculatePreferredSize() const {
  return GetSizeForLabelWidth(label()->GetPreferredSize().width());
}

void IconLabelBubbleView::Layout() {
  ink_drop_container()->SetBoundsRect(GetLocalBounds());

  // We may not have horizontal room for both the image and the trailing
  // padding. When the view is expanding (or showing-label steady state), the
  // image. When the view is contracting (or hidden-label steady state), whittle
  // away at the trailing padding instead.
  int bubble_trailing_padding = GetEndPaddingWithSeparator();
  int image_width = image()->GetPreferredSize().width();
  const int space_shortage = image_width + bubble_trailing_padding - width();
  if (space_shortage > 0) {
    if (ShouldShowLabel())
      image_width -= space_shortage;
    else
      bubble_trailing_padding -= space_shortage;
  }
  image()->SetBounds(GetInsets().left(), 0, image_width, height());

  // Compute the label bounds. The label gets whatever size is left over after
  // accounting for the preferred image width and padding amounts. Note that if
  // the label has zero size it doesn't actually matter what we compute its X
  // value to be, since it won't be visible.
  const int label_x = image()->bounds().right() + GetInternalSpacing();
  int label_width = std::max(0, width() - label_x - bubble_trailing_padding -
                                    GetWidthBetweenIconAndSeparator());
  label()->SetBounds(label_x, 0, label_width, height());

  // The separator should be the same height as the icons.
  const int separator_height = GetLayoutConstant(LOCATION_BAR_ICON_SIZE);
  gfx::Rect separator_bounds(label()->bounds());
  separator_bounds.Inset(0, (separator_bounds.height() - separator_height) / 2);

  float separator_width =
      GetWidthBetweenIconAndSeparator() + GetEndPaddingWithSeparator();
  int separator_x = label()->GetText().empty() ? image()->bounds().right()
                                               : label()->bounds().right();
  separator_view_->SetBounds(separator_x, separator_bounds.y(), separator_width,
                             separator_height);

  if (focus_ring()) {
    focus_ring()->Layout();
    focus_ring()->SchedulePaint();
  }
}

bool IconLabelBubbleView::OnMousePressed(const ui::MouseEvent& event) {
  suppress_button_release_ = IsBubbleShowing();
  return LabelButton::OnMousePressed(event);
}

void IconLabelBubbleView::OnThemeChanged() {
  LabelButton::OnThemeChanged();

  // LabelButton::OnThemeChanged() sets a views::Background on the label
  // under certain conditions. We don't want that, so unset the background.
  label()->SetBackground(nullptr);

  UpdateLabelColors();
}

std::unique_ptr<views::InkDrop> IconLabelBubbleView::CreateInkDrop() {
  std::unique_ptr<views::InkDropImpl> ink_drop =
      CreateDefaultFloodFillInkDropImpl();
  ink_drop->SetShowHighlightOnFocus(!focus_ring());
  ink_drop->AddObserver(this);
  return std::move(ink_drop);
}

SkColor IconLabelBubbleView::GetInkDropBaseColor() const {
  return delegate_->GetIconLabelBubbleInkDropColor();
}

bool IconLabelBubbleView::IsTriggerableEvent(const ui::Event& event) {
  if (event.IsMouseEvent())
    return !IsBubbleShowing() && !suppress_button_release_;

  return true;
}

bool IconLabelBubbleView::ShouldUpdateInkDropOnClickCanceled() const {
  // The click might be cancelled because the bubble is still opened. In this
  // case, the ink drop state should not be hidden by Button.
  return false;
}

void IconLabelBubbleView::NotifyClick(const ui::Event& event) {
  LabelButton::NotifyClick(event);
  ShowBubble(event);
}

void IconLabelBubbleView::OnFocus() {
  separator_view_->UpdateOpacity();
  LabelButton::OnFocus();
}

void IconLabelBubbleView::OnBlur() {
  separator_view_->UpdateOpacity();
  LabelButton::OnBlur();
}

void IconLabelBubbleView::AnimationEnded(const gfx::Animation* animation) {
  if (animation != &slide_animation_)
    return views::LabelButton::AnimationEnded(animation);

  if (!is_animation_paused_) {
    // If there is no separator to show, then that means we want the text to
    // disappear after animating.
    ResetSlideAnimation(/*show_label=*/ShouldShowSeparator());
    PreferredSizeChanged();
  }

  GetInkDrop()->SetShowHighlightOnHover(true);
  GetInkDrop()->SetShowHighlightOnFocus(!focus_ring());
}

void IconLabelBubbleView::AnimationProgressed(const gfx::Animation* animation) {
  if (animation != &slide_animation_)
    return views::LabelButton::AnimationProgressed(animation);

  if (!is_animation_paused_)
    PreferredSizeChanged();
}

void IconLabelBubbleView::AnimationCanceled(const gfx::Animation* animation) {
  if (animation != &slide_animation_)
    return views::LabelButton::AnimationCanceled(animation);

  AnimationEnded(animation);
}

void IconLabelBubbleView::GetAccessibleNodeData(ui::AXNodeData* node_data) {
  LabelButton::GetAccessibleNodeData(node_data);
  if (GetAccessibleName().empty())
    node_data->SetNameExplicitlyEmpty();
}

void IconLabelBubbleView::SetImage(const gfx::ImageSkia& image_skia) {
  DCHECK(!image_skia.isNull());
  LabelButton::SetImage(STATE_NORMAL, image_skia);
}

gfx::Size IconLabelBubbleView::GetSizeForLabelWidth(int label_width) const {
  gfx::Size image_size = image()->GetPreferredSize();
  image_size.Enlarge(GetInsets().left() + GetWidthBetweenIconAndSeparator() +
                         GetEndPaddingWithSeparator(),
                     GetInsets().height());

  const bool shrinking = IsShrinking();
  // The out portion of the in-out animation continues for the last few pixels
  // even after the label is not visible in order to slide the icon into its
  // final position. Therefore it is necessary to calculate additional width
  // even when the label is hidden as long as the animation is still shrinking.
  if (!ShouldShowLabel() && !shrinking)
    return image_size;

  const int min_width =
      shrinking ? image_size.width() : grow_animation_starting_width_;
  const int max_width = image_size.width() + GetInternalSpacing() + label_width;

  return gfx::Size(GetWidthBetween(min_width, max_width), image_size.height());
}

int IconLabelBubbleView::GetInternalSpacing() const {
  if (image()->GetPreferredSize().IsEmpty())
    return 0;
  return (ui::TouchUiController::Get()->touch_ui() ? 10 : 8) +
         GetExtraInternalSpacing();
}

int IconLabelBubbleView::GetExtraInternalSpacing() const {
  return 0;
}

int IconLabelBubbleView::GetWidthBetweenIconAndSeparator() const {
  return ShouldShowSeparator() ? kIconLabelBubbleSpaceBesideSeparator : 0;
}

int IconLabelBubbleView::GetEndPaddingWithSeparator() const {
  int end_padding = ShouldShowSeparator() ? kIconLabelBubbleSpaceBesideSeparator
                                          : GetInsets().right();
  if (ShouldShowSeparator())
    end_padding += kIconLabelBubbleSeparatorWidth;
  return end_padding;
}

const char* IconLabelBubbleView::GetClassName() const {
  return "IconLabelBubbleView";
}

void IconLabelBubbleView::SetUpForAnimation() {
  SetInkDropMode(InkDropMode::ON);
  SetFocusBehavior(FocusBehavior::ACCESSIBLE_ONLY);
  label()->SetElideBehavior(gfx::NO_ELIDE);
  label()->SetVisible(false);
  slide_animation_.SetSlideDuration(base::TimeDelta::FromMilliseconds(150));
  open_state_fraction_ = 1.0;
}

void IconLabelBubbleView::SetUpForInOutAnimation() {
  SetUpForAnimation();
  // The duration of the slide includes the appearance of the label (600ms),
  // statically showing the label (1800ms), and hiding the label (600ms). The
  // proportion of time spent in each portion of the animation is controlled by
  // kIconLabelBubbleOpenTimeFraction.
  slide_animation_.SetSlideDuration(base::TimeDelta::FromMilliseconds(3000));
  // The tween is calculated in GetWidthBetween().
  slide_animation_.SetTweenType(gfx::Tween::LINEAR);
  open_state_fraction_ = 0.2;
}

void IconLabelBubbleView::AnimateIn(base::Optional<int> string_id) {
  if (!label()->GetVisible()) {
    // Start animation from the current width, otherwise the icon will also be
    // included if visible.
    grow_animation_starting_width_ = GetVisible() ? width() : 0;
    if (string_id) {
      base::string16 label = l10n_util::GetStringUTF16(string_id.value());
      SetLabel(label);

      // Send an accessibility alert whose text is the label's text. Doing this
      // causes a screenreader to immediately announce the text of the button,
      // which serves to announce it. This is done unconditionally here if there
      // is text because the animation is intended to draw attention to the
      // instance anyway.
      alert_virtual_view_->GetCustomData().SetName(label);
      alert_virtual_view_->NotifyAccessibilityEvent(ax::mojom::Event::kAlert);
    }
    label()->SetVisible(true);
    ShowAnimation();
  }
}

void IconLabelBubbleView::AnimateOut() {
  if (label()->GetVisible()) {
    label()->SetVisible(false);
    HideAnimation();
  }
}

void IconLabelBubbleView::ResetSlideAnimation(bool show_label) {
  label()->SetVisible(show_label);
  slide_animation_.Reset(show_label);
}

void IconLabelBubbleView::ReduceAnimationTimeForTesting() {
  slide_animation_.SetSlideDuration(base::TimeDelta::FromMilliseconds(1));
}

void IconLabelBubbleView::PauseAnimation() {
  if (slide_animation_.is_animating()) {
    // If the user clicks while we're animating, the bubble arrow will be
    // pointing to the image, and if we allow the animation to keep running, the
    // image will move away from the arrow (or we'll have to move the bubble,
    // which is even worse). So we want to stop the animation.  We have two
    // choices: jump to the final post-animation state (no label visible), or
    // pause the animation where we are and continue running after the bubble
    // closes. The former looks more jerky, so we avoid it unless the animation
    // hasn't even fully exposed the image yet, in which case pausing with half
    // an image visible will look broken.
    if (!is_animation_paused_ && ShouldShowLabel()) {
      is_animation_paused_ = true;
      pause_animation_state_ = slide_animation_.GetCurrentValue();
    }
    slide_animation_.Reset();
  }
}

void IconLabelBubbleView::UnpauseAnimation() {
  if (is_animation_paused_) {
    slide_animation_.Reset(pause_animation_state_);
    is_animation_paused_ = false;
    ShowAnimation();
  }
}

double IconLabelBubbleView::GetAnimationValue() const {
  return slide_animation_.GetCurrentValue();
}

void IconLabelBubbleView::ShowAnimation() {
  slide_animation_.Show();
  GetInkDrop()->SetShowHighlightOnHover(false);
  GetInkDrop()->SetShowHighlightOnFocus(false);
}

void IconLabelBubbleView::HideAnimation() {
  slide_animation_.Hide();
  GetInkDrop()->SetShowHighlightOnHover(false);
  GetInkDrop()->SetShowHighlightOnFocus(false);
}

SkPath IconLabelBubbleView::GetHighlightPath() const {
  gfx::Rect highlight_bounds = GetLocalBounds();
  if (ShouldShowSeparator())
    highlight_bounds.Inset(0, 0, GetEndPaddingWithSeparator(), 0);
  highlight_bounds = GetMirroredRect(highlight_bounds);

  const float corner_radius = highlight_bounds.height() / 2.f;
  const SkRect rect = RectToSkRect(highlight_bounds);

  return SkPath().addRoundRect(rect, corner_radius, corner_radius);
}

void IconLabelBubbleView::UpdateBorder() {
  // Bubbles are given the full internal height of the location bar so that all
  // child views in the location bar have the same height. The visible height of
  // the bubble should be smaller, so use an empty border to shrink down the
  // content bounds so the background gets painted correctly.
  SetBorder(views::CreateEmptyBorder(
      gfx::Insets(GetLayoutConstant(LOCATION_BAR_CHILD_INTERIOR_PADDING),
                  GetLayoutInsets(LOCATION_BAR_ICON_INTERIOR_PADDING).left())));
}