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// Copyright 2021 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_TEST_VIEW_DRAWN_WAITER_H_
#define ASH_TEST_VIEW_DRAWN_WAITER_H_
#include <memory>
#include "ash/ash_export.h"
#include "base/scoped_observation.h"
#include "ui/views/view.h"
#include "ui/views/view_observer.h"
namespace base {
class RunLoop;
}
namespace ash {
// Helper that allows waiting for a view to be drawn. See `Wait()` below. An
// instance can be used more than once (i.e. to wait on a different view).
class ViewDrawnWaiter : public views::ViewObserver {
public:
ViewDrawnWaiter();
ViewDrawnWaiter(const ViewDrawnWaiter&) = delete;
ViewDrawnWaiter& operator=(const ViewDrawnWaiter&) = delete;
~ViewDrawnWaiter() override;
// Waits for `view` to be drawn (implying visible) and have non-zero size
// (implying layout is complete).
void Wait(views::View* view);
private:
// views::ViewObserver:
void OnViewVisibilityChanged(views::View* view,
views::View* starting_view) override;
void OnViewBoundsChanged(views::View* view) override;
void OnViewIsDeleting(views::View* view) override;
std::unique_ptr<base::RunLoop> wait_loop_;
base::ScopedObservation<views::View, views::ViewObserver> view_observer_{
this};
};
} // namespace ash
#endif // ASH_TEST_VIEW_DRAWN_WAITER_H_
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