1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
content / public / browser / render_widget_host_observer.h [blame]
// 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 CONTENT_PUBLIC_BROWSER_RENDER_WIDGET_HOST_OBSERVER_H_
#define CONTENT_PUBLIC_BROWSER_RENDER_WIDGET_HOST_OBSERVER_H_
#include "base/observer_list_types.h"
#include "content/common/content_export.h"
namespace content {
class RenderWidgetHost;
// An observer API implemented by classes which are interested
// in RenderWidgetHost events.
class CONTENT_EXPORT RenderWidgetHostObserver : public base::CheckedObserver {
public:
// This method is invoked when the visibility of the RenderWidgetHost changes.
virtual void RenderWidgetHostVisibilityChanged(RenderWidgetHost* widget_host,
bool became_visible) {}
// Invoked after the renderer has updated visual properties on the main thread
// and committed the change on the compositor thread.
virtual void RenderWidgetHostDidUpdateVisualProperties(
RenderWidgetHost* widget_host) {}
// This method is invoked when the observed RenderWidgetHost is destroyed.
// This is guaranteed to be the last call made to the observer, so if the
// observer is tied to the observed RenderWidgetHost, it is safe to delete it.
virtual void RenderWidgetHostDestroyed(RenderWidgetHost* widget_host) {}
protected:
~RenderWidgetHostObserver() override;
};
} // namespace content
#endif // CONTENT_PUBLIC_BROWSER_RENDER_WIDGET_HOST_OBSERVER_H_