File: shadow_controller_delegate.h

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// Copyright 2018 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_WM_CORE_SHADOW_CONTROLLER_DELEGATE_H_
#define UI_WM_CORE_SHADOW_CONTROLLER_DELEGATE_H_

#include <cstdint>

#include "base/component_export.h"

namespace aura {
class Window;
}

namespace wm {

// ShadowControllerDelegate allows a user to modify a shadow on certain windows
// differently from the normal use case.
class COMPONENT_EXPORT(UI_WM) ShadowControllerDelegate {
 public:
  ShadowControllerDelegate() = default;
  virtual ~ShadowControllerDelegate() = default;

  // Invoked when the shadow on |window| is to be modified, either normally from
  // activation change or manually.
  virtual bool ShouldShowShadowForWindow(const aura::Window* window) = 0;

  // Invoked when the `window` property changes.
  virtual bool ShouldUpdateShadowOnWindowPropertyChange(
      const aura::Window* window,
      const void* key,
      intptr_t old) = 0;

  // Invoked when the shadow on `window` is created to apply the window color
  // theme to its shadow.
  virtual void ApplyColorThemeToWindowShadow(aura::Window* window) = 0;
};

}  // namespace wm

#endif  // UI_WM_CORE_SHADOW_CONTROLLER_DELEGATE_H_