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incoming_message_dispatcher.h
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1 // Copyright 2013 The Flutter 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 FLUTTER_SHELL_PLATFORM_COMMON_INCOMING_MESSAGE_DISPATCHER_H_
6 #define FLUTTER_SHELL_PLATFORM_COMMON_INCOMING_MESSAGE_DISPATCHER_H_
7
8 #include <functional>
9 #include <map>
10 #include <set>
11 #include <string>
12 #include <utility>
13
14 #include "flutter/shell/platform/common/public/flutter_messenger.h"
15
16 namespace flutter {
17
18 // Manages per-channel registration of callbacks for handling messages from the
19 // Flutter engine, and dispatching incoming messages to those handlers.
20 class IncomingMessageDispatcher {
21 public:
22 // Creates a new IncomingMessageDispatcher. |messenger| must remain valid as
23 // long as this object exists.
24 explicit IncomingMessageDispatcher(FlutterDesktopMessengerRef messenger);
25
26 virtual ~IncomingMessageDispatcher();
27
28 // Prevent copying.
29 IncomingMessageDispatcher(IncomingMessageDispatcher const&) = delete;
30 IncomingMessageDispatcher& operator=(IncomingMessageDispatcher const&) =
31 delete;
32
33 // Routes |message| to the registered handler for its channel, if any.
34 //
35 // If input blocking has been enabled on that channel, wraps the call to the
36 // handler with calls to the given callbacks to block and then unblock input.
37 //
38 // If no handler is registered for the message's channel, sends a
39 // NotImplemented response to the engine.
40 void HandleMessage(
41 const FlutterDesktopMessage& message,
42 const std::function<void(void)>& input_block_cb = [] {},
43 const std::function<void(void)>& input_unblock_cb = [] {});
44
45 // Registers a message callback for incoming messages from the Flutter
46 // side on the specified channel. |callback| will be called with the message
47 // and |user_data| any time a message arrives on that channel.
48 //
49 // Replaces any existing callback. Pass a null callback to unregister the
50 // existing callback.
51 void SetMessageCallback(const std::string& channel,
52 FlutterDesktopMessageCallback callback,
53 void* user_data);
54
55 // Enables input blocking on the given channel name.
56 //
57 // If set, then the parent window should disable input callbacks
58 // while waiting for the handler for messages on that channel to run.
59 void EnableInputBlockingForChannel(const std::string& channel);
60
61 private:
62 // Handle for interacting with the C messaging API.
63 FlutterDesktopMessengerRef messenger_;
64
65 // A map from channel names to the FlutterDesktopMessageCallback that should
66 // be called for incoming messages on that channel, along with the void* user
67 // data to pass to it.
68 std::map<std::string, std::pair<FlutterDesktopMessageCallback, void*>>
69 callbacks_;
70
71 // Channel names for which input blocking should be enabled during the call to
72 // that channel's handler.
73 std::set<std::string> input_blocking_channels_;
74 };
75
76 } // namespace flutter
77
78 #endif // FLUTTER_SHELL_PLATFORM_COMMON_INCOMING_MESSAGE_DISPATCHER_H_
flutter::IncomingMessageDispatcher::operator=
IncomingMessageDispatcher & operator=(IncomingMessageDispatcher const &)=delete
flutter::IncomingMessageDispatcher
Definition: incoming_message_dispatcher.h:20
flutter_messenger.h
user_data
void * user_data
Definition: texture_registrar_unittests.cc:27
flutter::IncomingMessageDispatcher::HandleMessage
void HandleMessage(const FlutterDesktopMessage &message, const std::function< void(void)> &input_block_cb=[] {}, const std::function< void(void)> &input_unblock_cb=[] {})
Definition: incoming_message_dispatcher.cc:16
flutter::IncomingMessageDispatcher::~IncomingMessageDispatcher
virtual ~IncomingMessageDispatcher()
flutter
Definition: accessibility_bridge.h:28
flutter::IncomingMessageDispatcher::SetMessageCallback
void SetMessageCallback(const std::string &channel, FlutterDesktopMessageCallback callback, void *user_data)
Definition: incoming_message_dispatcher.cc:43
FlutterDesktopMessengerRef
struct FlutterDesktopMessenger * FlutterDesktopMessengerRef
Definition: flutter_messenger.h:19
flutter::IncomingMessageDispatcher::IncomingMessageDispatcher
IncomingMessageDispatcher(FlutterDesktopMessengerRef messenger)
Definition: incoming_message_dispatcher.cc:9
FlutterDesktopMessage
Definition: flutter_messenger.h:31
flutter::IncomingMessageDispatcher::EnableInputBlockingForChannel
void EnableInputBlockingForChannel(const std::string &channel)
Definition: incoming_message_dispatcher.cc:54
FlutterDesktopMessageCallback
void(* FlutterDesktopMessageCallback)(FlutterDesktopMessengerRef, const FlutterDesktopMessage *, void *)
Definition: flutter_messenger.h:49