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// Copyright 2014 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.
#include "athena/athena_export.h"
#include "base/strings/string16.h"
typedef unsigned int SkColor;
namespace gfx {
class ImageSkia;
namespace views {
class View;
class Widget;
namespace athena {
class ActivityView;
// The view model for the representation of the activity.
class ATHENA_EXPORT ActivityViewModel {
virtual ~ActivityViewModel() {}
// Called after the view model is attached to the widget/window tree and
// before it gets registered to the ActivityManager and the ResourceManager.
// At this time the Activity can also be moved to a different place in the
// Activity history.
virtual void Init() = 0;
// Returns a color most representative of this activity.
virtual SkColor GetRepresentativeColor() const = 0;
// Returns a title for the activity.
virtual base::string16 GetTitle() const = 0;
// Returns an icon for the activity.
virtual gfx::ImageSkia GetIcon() const = 0;
// Sets the ActivityView for the model to update. The model does not take
// ownership of the view.
virtual void SetActivityView(ActivityView* view) = 0;
// True if the activity wants to use Widget's frame, or false if the activity
// draws its own frame.
virtual bool UsesFrame() const = 0;
// Returns the contents view which might be nullptr if the activity is not
// loaded. Note that the caller should not hold on to the view since it can
// be deleted by the resource manager.
virtual views::View* GetContentsView() = 0;
// Returns an image which can be used to represent the activity in e.g. the
// overview mode. The returned image can have no size if either a view exists
// or the activity has not yet been loaded or ever been presented. In that
// case GetRepresentativeColor() should be used to clear the preview area.
// Note that since the image gets created upon request, and the
// ActivityViewModel will hold no reference to the returned image data. As
// such it is advisable to hold on to the image as long as needed instead of
// calling this function frequently since it will cause time to generate.
virtual gfx::ImageSkia GetOverviewModeImage() = 0;
// Prepares the contents view for overview.
virtual void PrepareContentsForOverview() = 0;
// Undoes any changes done by PrepareContentsForOverview().
virtual void ResetContentsView() = 0;
} // namespace athena