components/mus/event_dispatcher.h

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef COMPONENTS_MUS_EVENT_DISPATCHER_H_
   6 #define COMPONENTS_MUS_EVENT_DISPATCHER_H_
   7
   8 #include <map>
   9
  10 #include "base/basictypes.h"
  11 #include "ui/mojo/events/input_event_constants.mojom.h"
  12 #include "ui/mojo/events/input_events.mojom.h"
  13 #include "ui/mojo/events/input_key_codes.mojom.h"
  14
  15 namespace mus {
  16
  17 class ServerView;
  18 class ViewTreeHostImpl;
  19
  20 // Handles dispatching events to the right location as well as updating focus.
  21 class EventDispatcher {
  22  public:
  23   explicit EventDispatcher(ViewTreeHostImpl* view_tree_host);
  24   ~EventDispatcher();
  25
  26   void AddAccelerator(uint32_t id,
  27                       mojo::KeyboardCode keyboard_code,
  28                       mojo::EventFlags flags);
  29   void RemoveAccelerator(uint32_t id);
  30
  31   void OnEvent(mojo::EventPtr event);
  32
  33  private:
  34   struct Accelerator {
  35     Accelerator(mojo::KeyboardCode keyboard_code, mojo::EventFlags flags)
  36         : keyboard_code(keyboard_code), flags(flags) {}
  37
  38     // So we can use this in a set.
  39     bool operator<(const Accelerator& other) const {
  40       if (keyboard_code == other.keyboard_code)
  41         return flags < other.flags;
  42       return keyboard_code < other.keyboard_code;
  43     }
  44
  45     mojo::KeyboardCode keyboard_code;
  46     mojo::EventFlags flags;
  47   };
  48
  49   // Looks to see if there is an accelerator bound to the specified code/flags.
  50   // If there is one, sets |accelerator_id| to the id of the accelerator invoked
  51   // and returns true. If there is none, returns false so normal key event
  52   // processing can continue.
  53   bool FindAccelerator(const mojo::Event& event, uint32_t* accelerator_id);
  54
  55   // Returns the ServerView that should receive |event|. If |event| is a
  56   // pointer-type event, then this function also updates the event location to
  57   // make sure it is in the returned target's coordinate space.
  58   ServerView* FindEventTarget(mojo::Event* event);
  59
  60   ViewTreeHostImpl* view_tree_host_;
  61
  62   using Entry = std::pair<uint32_t, Accelerator>;
  63   std::map<uint32_t, Accelerator> accelerators_;
  64
  65   DISALLOW_COPY_AND_ASSIGN(EventDispatcher);
  66 };
  67
  68 }  // namespace mus
  69
  70 #endif  // COMPONENTS_MUS_EVENT_DISPATCHER_H_