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- // Copyright 2021 The Chromium Authors. All rights reserved.
- // 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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