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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_VIEWS_CONTROLS_BUTTON_LABEL_BUTTON_IMAGE_CONTAINER_H_
#define UI_VIEWS_CONTROLS_BUTTON_LABEL_BUTTON_IMAGE_CONTAINER_H_
#include <memory>
#include "base/memory/raw_ptr.h"
#include "ui/views/view_tracker.h"
#include "ui/views/views_export.h"
namespace views {
class View;
class LabelButton;
// Abstract interface used by LabelButton to handle updates to the button
// image(s). This interface lets callers configure the button to have one image
// or multiple without LabelButton itself needing to understand the details.
// LabelButton can simply call CreateView() to get a view it can add as a child,
// then call UpdateImage() any time state changes in such a way that the
// image(s) might need to be updated. Concrete instances of this class are
// responsible for laying out any image(s) and updating them in response to
// calls to UpdateImage(), as well as any other relevant signals.
class VIEWS_EXPORT LabelButtonImageContainer {
public:
LabelButtonImageContainer() = default;
LabelButtonImageContainer(const LabelButtonImageContainer&) = delete;
LabelButtonImageContainer& operator=(const LabelButtonImageContainer&) =
delete;
virtual ~LabelButtonImageContainer() = default;
// Returns a view holding whatever image(s) are desired. Calls to
// UpdateImage() outside this view's lifetime will have no effect.
virtual std::unique_ptr<View> CreateView() = 0;
// Gets a pointer to a previously created view. Returns nullptr if no view was
// created.
virtual View* GetView() = 0;
virtual const View* GetView() const = 0;
// Called when image(s) in the created view may need updating. `button` is the
// LabelButton which is displaying the images. Subclasses should respond to
// this by updating any image(s) appropriately based on the button's current
// state and any other state the container is tracking.
virtual void UpdateImage(const LabelButton* button) = 0;
};
// The common-case implementation of LabelButtonImageContainer, which provides a
// single image that tracks the LabelButton's ButtonState.
class VIEWS_EXPORT SingleImageContainer final
: public LabelButtonImageContainer {
public:
SingleImageContainer() = default;
SingleImageContainer(const SingleImageContainer&) = delete;
SingleImageContainer& operator=(const SingleImageContainer&) = delete;
~SingleImageContainer() override = default;
// LabelButtonImageContainer
std::unique_ptr<View> CreateView() override;
View* GetView() override;
const View* GetView() const override;
void UpdateImage(const LabelButton* button) override;
private:
views::ViewTracker image_view_tracker_;
};
} // namespace views
#endif // UI_VIEWS_CONTROLS_BUTTON_LABEL_BUTTON_IMAGE_CONTAINER_H_
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