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ash / wallpaper / views / wallpaper_view.h [blame]

// Copyright 2012 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_WALLPAPER_VIEWS_WALLPAPER_VIEW_H_
#define ASH_WALLPAPER_VIEWS_WALLPAPER_VIEW_H_

#include <set>

#include "ash/wallpaper/views/wallpaper_base_view.h"
#include "ash/wallpaper/wallpaper_constants.h"
#include "base/memory/raw_ptr.h"
#include "ui/base/metadata/metadata_header_macros.h"
#include "ui/base/mojom/menu_source_type.mojom-forward.h"
#include "ui/views/context_menu_controller.h"

namespace aura {
class Window;
}  // namespace aura

namespace ash {

// The desktop wallpaper view that, in addition to painting the wallpaper, can
// also add blur and dimming effects, as well as handle context menu requests.
class WallpaperView : public WallpaperBaseView,
                      public views::ContextMenuController {
  METADATA_HEADER(WallpaperView, WallpaperBaseView)

 public:
  explicit WallpaperView(float blur_sigma);

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

  ~WallpaperView() override;

  // Clears cached image. Must be called when wallpaper image is changed.
  void ClearCachedImage();

  // Enables/Disables the lock shield layer.
  void SetLockShieldEnabled(bool enabled);

  void set_blur_sigma(float blur_sigma) { blur_sigma_ = blur_sigma; }
  float blur_sigma() const { return blur_sigma_; }

  views::View* shield_view_for_testing() { return shield_view_; }

 private:
  // views::View:
  bool OnMousePressed(const ui::MouseEvent& event) override;
  void OnMouseReleased(const ui::MouseEvent& event) override;
  void OnBoundsChanged(const gfx::Rect& previous_bounds) override;

  // views::ContextMenuController:
  void ShowContextMenuForViewImpl(
      views::View* source,
      const gfx::Point& point,
      ui::mojom::MenuSourceType source_type) override;

  // WallpaperBaseView:
  void DrawWallpaper(const gfx::ImageSkia& wallpaper,
                     const gfx::Rect& src,
                     const gfx::Rect& dst,
                     const cc::PaintFlags& flags,
                     gfx::Canvas* canvas) override;

  // Blur sigma to draw wallpaper.
  float blur_sigma_ = wallpaper_constants::kClear;

  // A view to hold solid color layer to hide desktop, in case compositor
  // failed to draw its content due to memory shortage.
  raw_ptr<views::View, DanglingUntriaged> shield_view_ = nullptr;

  // A cached downsampled image of the wallpaper image. It will help wallpaper
  // blur/brightness animations be more performant.
  std::optional<gfx::ImageSkia> small_image_;
};

std::unique_ptr<views::Widget> CreateWallpaperWidget(
    aura::Window* root_window,
    float blur_sigma,
    bool locked,
    raw_ptr<WallpaperView>* out_wallpaper_view);

}  // namespace ash

#endif  // ASH_WALLPAPER_VIEWS_WALLPAPER_VIEW_H_