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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 COMPONENTS_MUS_EVENT_DISPATCHER_H_
#define COMPONENTS_MUS_EVENT_DISPATCHER_H_
#include <map>
#include "base/basictypes.h"
#include "ui/mojo/events/input_event_constants.mojom.h"
#include "ui/mojo/events/input_events.mojom.h"
#include "ui/mojo/events/input_key_codes.mojom.h"
namespace view_manager {
class ServerView;
class ViewTreeHostImpl;
// Handles dispatching events to the right location as well as updating focus.
class EventDispatcher {
public:
explicit EventDispatcher(ViewTreeHostImpl* view_tree_host);
~EventDispatcher();
void AddAccelerator(uint32_t id,
mojo::KeyboardCode keyboard_code,
mojo::EventFlags flags);
void RemoveAccelerator(uint32_t id);
void OnEvent(mojo::EventPtr event);
private:
struct Accelerator {
Accelerator(mojo::KeyboardCode keyboard_code, mojo::EventFlags flags)
: keyboard_code(keyboard_code), flags(flags) {}
// So we can use this in a set.
bool operator<(const Accelerator& other) const {
if (keyboard_code == other.keyboard_code)
return flags < other.flags;
return keyboard_code < other.keyboard_code;
}
mojo::KeyboardCode keyboard_code;
mojo::EventFlags flags;
};
// Looks to see if there is an accelerator bound to the specified code/flags.
// If there is one, sets |accelerator_id| to the id of the accelerator invoked
// and returns true. If there is none, returns false so normal key event
// processing can continue.
bool FindAccelerator(const mojo::Event& event, uint32_t* accelerator_id);
// Returns the ServerView that should receive |event|. If |event| is a
// pointer-type event, then this function also updates the event location to
// make sure it is in the returned target's coordinate space.
ServerView* FindEventTarget(mojo::Event* event);
ViewTreeHostImpl* view_tree_host_;
using Entry = std::pair<uint32_t, Accelerator>;
std::map<uint32_t, Accelerator> accelerators_;
DISALLOW_COPY_AND_ASSIGN(EventDispatcher);
};
} // namespace view_manager
#endif // COMPONENTS_MUS_EVENT_DISPATCHER_H_
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