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// Copyright 2013 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 CHROME_BROWSER_MEDIA_WEBRTC_DESKTOP_MEDIA_LIST_H_
#define CHROME_BROWSER_MEDIA_WEBRTC_DESKTOP_MEDIA_LIST_H_
#include <vector>
#include "base/strings/string16.h"
#include "base/time/time.h"
#include "content/public/browser/desktop_media_id.h"
#include "ui/gfx/image/image_skia.h"
class DesktopMediaListObserver;
// DesktopMediaList provides the list of desktop media source (screens, windows,
// tabs), and their thumbnails, to the desktop media picker dialog. It
// transparently updates the list in the background, and notifies the desktop
// media picker when something changes.
//
// TODO(crbug.com/987001): Consider renaming this class.
class DesktopMediaList {
public:
// Struct used to represent each entry in the list.
struct Source {
// Id of the source.
content::DesktopMediaID id;
// Name of the source that should be shown to the user.
base::string16 name;
// The thumbnail for the source.
gfx::ImageSkia thumbnail;
};
using UpdateCallback = base::OnceClosure;
virtual ~DesktopMediaList() {}
// Sets time interval between updates. By default list of sources and their
// thumbnail are updated once per second. If called after StartUpdating() then
// it will take effect only after the next update.
virtual void SetUpdatePeriod(base::TimeDelta period) = 0;
// Sets size to which the thumbnails should be scaled. If called after
// StartUpdating() then some thumbnails may be still scaled to the old size
// until they are updated.
virtual void SetThumbnailSize(const gfx::Size& thumbnail_size) = 0;
// Sets ID of the hosting desktop picker dialog. The window with this ID will
// be filtered out from the list of sources.
virtual void SetViewDialogWindowId(content::DesktopMediaID dialog_id) = 0;
// Starts updating the model. The model is initially empty, so OnSourceAdded()
// notifications will be generated for each existing source as it is
// enumerated. After the initial enumeration the model will be refreshed based
// on the update period, and notifications generated only for changes in the
// model.
virtual void StartUpdating(DesktopMediaListObserver* observer) = 0;
// Updates the model and calls |callback| when all currently existing sources
// have been found, passing |this| as the argument. In most respects, this is
// a simplified version of StartUpdating(). This method should only be called
// once per DesktopMediaList instance. It should not be called after
// StartUpdating(), and StartUpdating() should not be called until |callback|
// has been called.
virtual void Update(UpdateCallback callback) = 0;
virtual int GetSourceCount() const = 0;
virtual const Source& GetSource(int index) const = 0;
virtual content::DesktopMediaID::Type GetMediaListType() const = 0;
};
#endif // CHROME_BROWSER_MEDIA_WEBRTC_DESKTOP_MEDIA_LIST_H_
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