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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 COMPONENTS_USER_EDUCATION_VIEWS_HELP_BUBBLE_EVENT_RELAY_H_
#define COMPONENTS_USER_EDUCATION_VIEWS_HELP_BUBBLE_EVENT_RELAY_H_
#include "base/callback_list.h"
#include "base/memory/raw_ptr.h"
#include "ui/events/event.h"
#include "ui/views/controls/button/button.h"
#include "ui/views/controls/menu/menu_item_view.h"
namespace user_education {
class HelpBubbleView;
// Class that intercepts events in screen coordinates and determines whether
// they should be applied to a help bubble. Owned by the help bubble, though it
// can be created elsewhere.
class HelpBubbleEventRelay {
public:
HelpBubbleEventRelay(const HelpBubbleEventRelay&) = delete;
void operator=(const HelpBubbleEventRelay&) = delete;
virtual ~HelpBubbleEventRelay();
// Perform the initialization and attach to the help bubble. Derived classes
// should call the base class implementation first.
virtual void Init(HelpBubbleView* help_bubble);
// Returns whether the help bubble should process events normally (as opposed
// to only via this object).
virtual bool ShouldHelpBubbleProcessEvents() const = 0;
// Returns whether buttons on the help bubble should un-hover when a "mouse
// exit" type event is detected.
virtual bool ShouldUnHoverOnMouseExit() const = 0;
protected:
// Used by derived classes. If `capture_mouse_exit` is specified then an exit
// event will un-hover the help bubble.
HelpBubbleEventRelay();
HelpBubbleView* help_bubble() { return help_bubble_; }
// Called by derived classes when `event` is received at `screen_coordinates`.
// Returns whether the help bubble fully handles the event.
bool OnEvent(const ui::LocatedEvent& event, const gfx::Point& screen_coords);
// Notifies that the connection to the event source has been lost. If a click
// has not already been forwarded to a button, this usually closes the help
// bubble.
void OnConnectionLost();
private:
// Returns the button at `screen_coords` in `help_bubble`, or null if none.
views::Button* GetButtonAt(const gfx::Point& screen_coords) const;
raw_ptr<HelpBubbleView> help_bubble_ = nullptr;
raw_ptr<views::Button> hovered_button_ = nullptr;
bool sent_click_ = false;
};
namespace internal {
// Because menus use event capture, a help bubble anchored to a menu cannot
// respond to events in the normal way. However, help bubbles are not
// complicated and only have buttons. When a help bubble is anchored to a menu,
// this object will monitor events that would be captured by the menu, and
// ensures that the buttons on the help bubble still behavior predictably.
class MenuHelpBubbleEventProcessor : public HelpBubbleEventRelay {
public:
explicit MenuHelpBubbleEventProcessor(views::MenuItemView* menu_item);
~MenuHelpBubbleEventProcessor() override;
// HelpBubbleEventProcessor:
bool ShouldHelpBubbleProcessEvents() const override;
bool ShouldUnHoverOnMouseExit() const override;
private:
bool OnEvent(const ui::LocatedEvent& event);
base::CallbackListSubscription callback_handle_;
};
} // namespace internal
} // namespace user_education
#endif // COMPONENTS_USER_EDUCATION_VIEWS_HELP_BUBBLE_EVENT_RELAY_H_
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