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ash / system / tray / tray_container.h [blame]

// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef ASH_SYSTEM_TRAY_TRAY_CONTAINER_H_
#define ASH_SYSTEM_TRAY_TRAY_CONTAINER_H_

#include <optional>

#include "ash/system/tray/tray_constants.h"
#include "base/memory/raw_ptr.h"
#include "ui/base/metadata/metadata_header_macros.h"
#include "ui/views/layout/box_layout.h"
#include "ui/views/view.h"

namespace views {
class Border;
}  // namespace views

namespace ash {
class Shelf;
class TrayBackgroundView;

// Base class for tray containers. Sets the border and layout. The container
// auto-resizes the widget when necessary.
class TrayContainer : public views::View {
  METADATA_HEADER(TrayContainer, views::View)

 public:
  TrayContainer(Shelf* shelf, TrayBackgroundView* tray_background_view);

  TrayContainer(const TrayContainer&) = delete;
  TrayContainer& operator=(const TrayContainer&) = delete;

  ~TrayContainer() override;

  // Calculates the ideal bounds that this view should have depending on the
  // constraints.
  void CalculateTargetBounds();

  // Makes this view's bounds and layout match its calculated target bounds.
  void UpdateLayout();

  void SetMargin(int main_axis_margin, int cross_axis_margin);
  void SetSpacingBetweenChildren(int space_dip);

 protected:
  // views::View:
  void OnPaint(gfx::Canvas* canvas) override;
  void ChildPreferredSizeChanged(views::View* child) override;
  void ChildVisibilityChanged(View* child) override;
  void ViewHierarchyChanged(
      const views::ViewHierarchyChangedDetails& details) override;
  gfx::Rect GetAnchorBoundsInScreen() const override;

 private:
  struct LayoutInputs {
    bool shelf_alignment_is_horizontal = true;
    int status_area_hit_region_padding = 0;
    gfx::Rect anchor_bounds_in_screen;
    int main_axis_margin = 0;
    int cross_axis_margin = 0;
    int spacing_between_children = 0;

    bool operator==(const LayoutInputs& other) const {
      return shelf_alignment_is_horizontal ==
                 other.shelf_alignment_is_horizontal &&
             status_area_hit_region_padding ==
                 other.status_area_hit_region_padding &&
             anchor_bounds_in_screen == other.anchor_bounds_in_screen &&
             main_axis_margin == other.main_axis_margin &&
             cross_axis_margin == other.cross_axis_margin &&
             spacing_between_children == other.spacing_between_children;
    }
  };

  // Collects the inputs for layout.
  LayoutInputs GetLayoutInputs() const;

  // views::View:
  void OnThemeChanged() override;

  // The set of inputs that impact this widget's layout. The assumption is that
  // this widget needs a relayout if, and only if, one or more of these has
  // changed.
  std::optional<LayoutInputs> layout_inputs_;

  // The border that has been calculated in the target bounds calculation
  // phase, and will be applied in the layout update phase.
  std::unique_ptr<views::Border> border_;

  // The layout manager that has been set up in the target bounds calculation
  // phase, and will be applied in the layout update phase.
  std::unique_ptr<views::BoxLayout> layout_manager_;

  const raw_ptr<Shelf> shelf_;
  const raw_ptr<TrayBackgroundView> tray_background_view_;

  int main_axis_margin_ = 0;
  int cross_axis_margin_ = 0;
  int spacing_between_children_ = kUnifiedTraySpacingBetweenIcons;
};

}  // namespace ash

#endif  // ASH_SYSTEM_TRAY_TRAY_CONTAINER_H_