ash/system/phonehub/task_continuation_view.cc

// Copyright 2020 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 "ash/system/phonehub/task_continuation_view.h"

#include "ash/strings/grit/ash_strings.h"
#include "ash/style/ash_color_provider.h"
#include "ash/system/phonehub/continue_browsing_chip.h"
#include "ash/system/phonehub/phone_hub_view_ids.h"
#include "ash/system/phonehub/ui_constants.h"
#include "ash/system/tray/tray_constants.h"
#include "ui/base/l10n/l10n_util.h"
#include "ui/gfx/geometry/insets.h"
#include "ui/gfx/text_constants.h"
#include "ui/views/controls/label.h"
#include "ui/views/layout/box_layout.h"

namespace ash {

using BrowserTabsModel = chromeos::phonehub::BrowserTabsModel;

namespace {

// Appearance constants in dip.
constexpr int kTaskContinuationChipHeight = 96;
constexpr int kTaskContinuationChipsInRow = 2;
constexpr int kTaskContinuationChipSpacing = 8;
constexpr int kTaskContinuationChipHorizontalSidePadding = 4;
constexpr int kTaskContinuationChipVerticalPadding = 4;
constexpr int kHeaderLabelLineHeight = 48;

// Typography.
constexpr int kHeaderTextFontSizeDip = 15;

gfx::Size GetTaskContinuationChipSize() {
  int width =
      (kTrayMenuWidth - kBubbleHorizontalSidePaddingDip * 2 -
       kTaskContinuationChipHorizontalSidePadding * 2 -
       kTaskContinuationChipSpacing * (kTaskContinuationChipsInRow - 1)) /
      kTaskContinuationChipsInRow;
  return gfx::Size(width, kTaskContinuationChipHeight);
}

class HeaderView : public views::Label {
 public:
  HeaderView() {
    SetText(
        l10n_util::GetStringUTF16(IDS_ASH_PHONE_HUB_TASK_CONTINUATION_TITLE));
    SetLineHeight(kHeaderLabelLineHeight);
    SetFontList(font_list()
                    .DeriveWithSizeDelta(kHeaderTextFontSizeDip -
                                         font_list().GetFontSize())
                    .DeriveWithWeight(gfx::Font::Weight::MEDIUM));
    SetHorizontalAlignment(gfx::HorizontalAlignment::ALIGN_LEFT);
    SetVerticalAlignment(gfx::VerticalAlignment::ALIGN_MIDDLE);
    SetAutoColorReadabilityEnabled(false);
    SetSubpixelRenderingEnabled(false);
    SetEnabledColor(AshColorProvider::Get()->GetContentLayerColor(
        AshColorProvider::ContentLayerType::kTextColorPrimary));
  }

  ~HeaderView() override = default;
  HeaderView(HeaderView&) = delete;
  HeaderView operator=(HeaderView&) = delete;

  // views::View:
  const char* GetClassName() const override { return "HeaderView"; }
};

}  // namespace

TaskContinuationView::TaskContinuationView(
    chromeos::phonehub::PhoneModel* phone_model)
    : phone_model_(phone_model) {
  SetID(PhoneHubViewID::kTaskContinuationView);

  phone_model_->AddObserver(this);

  auto* layout = SetLayoutManager(std::make_unique<views::BoxLayout>(
      views::BoxLayout::Orientation::kVertical));
  layout->set_cross_axis_alignment(
      views::BoxLayout::CrossAxisAlignment::kStart);

  AddChildView(std::make_unique<HeaderView>());
  chips_view_ = AddChildView(std::make_unique<TaskChipsView>());

  Update();
}

TaskContinuationView::~TaskContinuationView() {
  phone_model_->RemoveObserver(this);
}

void TaskContinuationView::OnModelChanged() {
  Update();
}

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

TaskContinuationView::TaskChipsView::TaskChipsView() = default;

TaskContinuationView::TaskChipsView::~TaskChipsView() = default;

void TaskContinuationView::TaskChipsView::AddTaskChip(views::View* task_chip) {
  int view_size = task_chips_.view_size();
  task_chips_.Add(task_chip, view_size);
  AddChildView(task_chip);
}

// views::View:
gfx::Size TaskContinuationView::TaskChipsView::CalculatePreferredSize() const {
  auto chip_size = GetTaskContinuationChipSize();
  int width = chip_size.width() * kTaskContinuationChipsInRow +
              kTaskContinuationChipSpacing +
              2 * kTaskContinuationChipHorizontalSidePadding;
  int rows_num =
      std::ceil((double)task_chips_.view_size() / kTaskContinuationChipsInRow);
  int height = (chip_size.height() + kTaskContinuationChipVerticalPadding) *
                   std::max(0, rows_num - 1) +
               chip_size.height() +
               2 * kTaskContinuationChipHorizontalSidePadding;
  return gfx::Size(width, height);
}

void TaskContinuationView::TaskChipsView::Layout() {
  views::View::Layout();
  CalculateIdealBounds();
  for (int i = 0; i < task_chips_.view_size(); ++i) {
    auto* button = task_chips_.view_at(i);
    button->SetBoundsRect(task_chips_.ideal_bounds(i));
  }
}

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

void TaskContinuationView::TaskChipsView::Reset() {
  task_chips_.Clear();
  RemoveAllChildViews(true /* delete_children */);
}

gfx::Point TaskContinuationView::TaskChipsView::GetButtonPosition(int index) {
  auto chip_size = GetTaskContinuationChipSize();
  int row = index / kTaskContinuationChipsInRow;
  int column = index % kTaskContinuationChipsInRow;
  int x = (chip_size.width() + kTaskContinuationChipSpacing) * column +
          kTaskContinuationChipHorizontalSidePadding;
  int y = (chip_size.height() + kTaskContinuationChipVerticalPadding) * row +
          kTaskContinuationChipVerticalPadding;
  return gfx::Point(x, y);
}

void TaskContinuationView::TaskChipsView::CalculateIdealBounds() {
  for (int i = 0; i < task_chips_.view_size(); ++i) {
    gfx::Rect tile_bounds =
        gfx::Rect(GetButtonPosition(i), GetTaskContinuationChipSize());
    task_chips_.set_ideal_bounds(i, tile_bounds);
  }
}

void TaskContinuationView::Update() {
  chips_view_->Reset();

  if (!phone_model_->browser_tabs_model()) {
    SetVisible(false);
    return;
  }

  const BrowserTabsModel& browser_tabs =
      phone_model_->browser_tabs_model().value();

  if (!browser_tabs.is_tab_sync_enabled() ||
      browser_tabs.most_recent_tabs().empty()) {
    SetVisible(false);
    return;
  }

  int index = 0;
  for (const BrowserTabsModel::BrowserTabMetadata& metadata :
       browser_tabs.most_recent_tabs()) {
    chips_view_->AddTaskChip(new ContinueBrowsingChip(metadata, index));
    index++;
  }

  PreferredSizeChanged();
  SetVisible(true);
}

}  // namespace ash