// Copyright 2018 The Fuchsia Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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library fuchsia.ui.views;
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using fuchsia.ui.gfx;
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union Event {
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ChildViewAttachedEvent child_view_attached;
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ChildViewUnavailableEvent child_view_unavailable;
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};
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// Called when a child view is attached.
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struct ChildViewAttachedEvent {
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uint32 view_holder_id;
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};
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// Called when a child view has become unavailable.
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//
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// A child may become unavailable for many reasons such being unregistered
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// by its application, abnormal termination of its application, or
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// cycles being introduced in the view tree.
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//
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// To complete removal of an unavailable child, this view component must
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// call RemoveChild() on its view with |child_key|.
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//
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// The implementation should invoke the callback once the event has
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// been handled.
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struct ChildViewUnavailableEvent {
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uint32 view_holder_id;
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};
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