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// Copyright 2015 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_WEBSITE_SETTINGS_CHOOSER_BUBBLE_DELEGATE_H_
#define CHROME_BROWSER_UI_WEBSITE_SETTINGS_CHOOSER_BUBBLE_DELEGATE_H_
#include <vector>
#include "base/macros.h"
#include "base/strings/string16.h"
#include "components/bubble/bubble_delegate.h"
class Browser;
// Subclass ChooserBubbleDelegate to implement a chooser bubble, which has
// some introductory text and a list of options that users can pick one of.
// Create an instance of your subclass and pass it to
// BubbleManager::ShowBubble() to show the bubble. Your subclass must define
// the set of options users can pick from; the actions taken after users
// select an item or press the 'Cancel' button or the bubble is closed.
// You can also override GetName() to identify the bubble you define for
// collecting metrics.
// After Select/Cancel/Close is called, this object is destroyed and call back
// into it is not allowed.
class ChooserBubbleDelegate : public BubbleDelegate {
public:
explicit ChooserBubbleDelegate(Browser* browser);
~ChooserBubbleDelegate() override;
// Since the set of options can change while the UI is visible an
// implementation should register an observer.
class Observer {
public:
// Called after the options list is initialized for the first time.
// OnOptionsInitialized should only be called once.
virtual void OnOptionsInitialized() = 0;
// Called after GetOptions()[index] has been added to the options and the
// newly added option is the last element in the options list. Calling
// GetOptions()[index] from inside a call to OnOptionAdded will see the
// added string since the options have already been updated.
virtual void OnOptionAdded(int index) = 0;
// Called when GetOptions()[index] is no longer present, and all later
// options have been moved earlier by 1 slot. Calling GetOptions()[index]
// from inside a call to OnOptionRemoved will NOT see the removed string
// since the options have already been updated.
virtual void OnOptionRemoved(int index) = 0;
protected:
virtual ~Observer() {}
};
// BubbleDelegate:
std::string GetName() const override;
scoped_ptr<BubbleUi> BuildBubbleUi() override;
// The set of options users can pick from. For example, it can be
// USB/Bluetooth devices names which are listed in the chooser bubble
// so that users can grant permission.
virtual const std::vector<base::string16>& GetOptions() const = 0;
// These three functions are called just before this object is destroyed:
// Called when the user selects the |index|th element from the dialog.
virtual void Select(int index) = 0;
// Called when the user presses the 'Cancel' button in the dialog.
virtual void Cancel() = 0;
// Called when the user clicks outside the dialog or the dialog otherwise
// closes without the user taking an explicit action.
virtual void Close() = 0;
// Only one observer may be registered at a time.
void set_observer(Observer* observer) { observer_ = observer; }
Observer* observer() const { return observer_; }
private:
Browser* browser_;
Observer* observer_ = nullptr;
DISALLOW_COPY_AND_ASSIGN(ChooserBubbleDelegate);
};
#endif // CHROME_BROWSER_UI_WEBSITE_SETTINGS_CHOOSER_BUBBLE_DELEGATE_H_
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