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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_UI_TABS_INACTIVE_WINDOW_MOUSE_EVENT_CONTROLLER_H_
#define CHROME_BROWSER_UI_TABS_INACTIVE_WINDOW_MOUSE_EVENT_CONTROLLER_H_
#include <memory>
#include "base/memory/weak_ptr.h"
namespace tabs {
class InactiveWindowMouseEventController;
// A scoped helper class that manages the lifetime of mouse event acceptance
// for a InactiveWindowMouseEventController object. It increments the counter
// upon construction and decrements it upon destruction.
class ScopedAcceptMouseEventsWhileWindowInactive {
public:
explicit ScopedAcceptMouseEventsWhileWindowInactive(
base::WeakPtr<InactiveWindowMouseEventController> controller);
~ScopedAcceptMouseEventsWhileWindowInactive();
private:
base::WeakPtr<InactiveWindowMouseEventController> controller_;
};
// Manages the state related to accepting mouse events
// while the window is inactive. It utilizes a counter mechanism that is
// controlled by the ScopedAcceptMouseEventsWhileWindowInactive helper.
class InactiveWindowMouseEventController {
public:
InactiveWindowMouseEventController();
~InactiveWindowMouseEventController();
bool ShouldAcceptMouseEventsWhileWindowInactive() const;
std::unique_ptr<ScopedAcceptMouseEventsWhileWindowInactive>
AcceptMouseEventsWhileWindowInactive();
base::WeakPtr<InactiveWindowMouseEventController> GetWeakPtr() {
return weak_ptr_factory_.GetWeakPtr();
}
// Only ScopedAcceptMouseEventsWhileWindowInactive can Increment and
// Decrement.
class PassKey {
public:
PassKey(const PassKey& other) = delete;
PassKey& operator=(const PassKey& other) = delete;
private:
friend class ScopedAcceptMouseEventsWhileWindowInactive;
PassKey() = default;
};
// Updates the count of ScopedAcceptMouseEventsWhileWindowInactive.
void Increment(PassKey key);
void Decrement(PassKey key);
private:
// Count of ScopedAcceptMouseEventsWhileWindowInactives that are constructed.
// When this value is 0 the application wont accept mouse events while the
// window is inactive. When the counter is greater than 0 it will on Mac. see
// chrome/browser/renderer_host/chrome_render_widget_host_view_mac_delegate.mm
int accept_input_counter_ = 0;
base::WeakPtrFactory<InactiveWindowMouseEventController> weak_ptr_factory_{
this};
};
} // namespace tabs
#endif // CHROME_BROWSER_UI_TABS_INACTIVE_WINDOW_MOUSE_EVENT_CONTROLLER_H_
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