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// Copyright 2018 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_UI_WEBAUTHN_HOVER_LIST_MODEL_H_
#define CHROME_BROWSER_UI_WEBAUTHN_HOVER_LIST_MODEL_H_
#include <stddef.h>
#include <vector>
#include "base/logging.h"
#include "base/macros.h"
#include "base/optional.h"
#include "base/strings/string16.h"
#include "ui/gfx/vector_icon_types.h"
// List model that controls which item is added to WebAuthN UI views.
// HoverListModel is observed by Observer which represents the actual
// UI view component.
class HoverListModel {
public:
enum class ListItemChangeType {
kAddToViewComponent,
kRemoveFromViewComponent,
};
class Observer {
public:
virtual void OnListItemAdded(int item_tag) = 0;
virtual void OnListItemRemoved(int removed_list_item_tag) = 0;
virtual void OnListItemChanged(int changed_list_item_tag,
ListItemChangeType type) = 0;
};
HoverListModel() = default;
virtual ~HoverListModel() = default;
virtual bool ShouldShowPlaceholderForEmptyList() const = 0;
virtual base::string16 GetPlaceholderText() const = 0;
// GetPlaceholderIcon may return nullptr to indicate that no icon should be
// added. This is distinct from using an empty icon as the latter will still
// take up as much space as any other icon.
virtual const gfx::VectorIcon* GetPlaceholderIcon() const = 0;
virtual std::vector<int> GetItemTags() const = 0;
virtual base::string16 GetItemText(int item_tag) const = 0;
virtual base::string16 GetDescriptionText(int item_tag) const = 0;
// GetItemIcon may return nullptr to indicate that no icon should be added.
// This is distinct from using an empty icon as the latter will still take up
// as much space as any other icon.
virtual const gfx::VectorIcon* GetItemIcon(int item_tag) const = 0;
virtual void OnListItemSelected(int item_tag) = 0;
virtual size_t GetPreferredItemCount() const = 0;
// StyleForTwoLines returns true if the items in the list should lay out
// with the assumption that there will be both item and description text.
// This causes items with no description text to be larger than strictly
// necessary so that all items, including those with descriptions, are the
// same height.
virtual bool StyleForTwoLines() const = 0;
void SetObserver(Observer* observer) {
DCHECK(!observer_);
observer_ = observer;
}
void RemoveObserver() { observer_ = nullptr; }
protected:
Observer* observer() { return observer_; }
private:
Observer* observer_ = nullptr;
DISALLOW_COPY_AND_ASSIGN(HoverListModel);
};
#endif // CHROME_BROWSER_UI_WEBAUTHN_HOVER_LIST_MODEL_H_