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window_proc_delegate_manager.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_WINDOWS_WINDOW_PROC_DELEGATE_MANAGER_H_
6 #define FLUTTER_SHELL_PLATFORM_WINDOWS_WINDOW_PROC_DELEGATE_MANAGER_H_
7
8 #include <Windows.h>
9
10 #include <optional>
11 #include <vector>
12
13 #include "flutter/fml/macros.h"
14 #include "flutter/shell/platform/windows/public/flutter_windows.h"
15
16 namespace flutter {
17
18 // Handles registration, unregistration, and dispatching for WindowProc
19 // delegation.
20 class WindowProcDelegateManager {
21 public:
22 explicit WindowProcDelegateManager();
23 ~WindowProcDelegateManager();
24
25 // Adds |callback| as a delegate to be called for |OnTopLevelWindowProc|.
26 //
27 // Multiple calls with the same |callback| will replace the previous
28 // registration, even if |user_data| is different.
29 void RegisterTopLevelWindowProcDelegate(
30 FlutterDesktopWindowProcCallback callback,
31 void* user_data);
32
33 // Unregisters |callback| as a delegate for |OnTopLevelWindowProc|.
34 void UnregisterTopLevelWindowProcDelegate(
35 FlutterDesktopWindowProcCallback callback);
36
37 // Calls any registered WindowProc delegates in the order they were
38 // registered.
39 //
40 // If a result is returned, then the message was handled in such a way that
41 // further handling should not be done.
42 std::optional<LRESULT> OnTopLevelWindowProc(HWND hwnd,
43 UINT message,
44 WPARAM wparam,
45 LPARAM lparam) const;
46
47 private:
48 struct WindowProcDelegate {
49 FlutterDesktopWindowProcCallback callback = nullptr;
50 void* user_data = nullptr;
51 };
52
53 std::vector<WindowProcDelegate> delegates_;
54
55 FML_DISALLOW_COPY_AND_ASSIGN(WindowProcDelegateManager);
56 };
57
58 } // namespace flutter
59
60 #endif // FLUTTER_SHELL_PLATFORM_WINDOWS_WINDOW_PROC_DELEGATE_MANAGER_H_
flutter::WindowProcDelegateManager
Definition: window_proc_delegate_manager.h:20
flutter::WindowProcDelegateManager::OnTopLevelWindowProc
std::optional< LRESULT > OnTopLevelWindowProc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam) const
Definition: window_proc_delegate_manager.cc:37
flutter::WindowProcDelegateManager::UnregisterTopLevelWindowProcDelegate
void UnregisterTopLevelWindowProcDelegate(FlutterDesktopWindowProcCallback callback)
Definition: window_proc_delegate_manager.cc:27
flutter::WindowProcDelegateManager::WindowProcDelegateManager
WindowProcDelegateManager()
flutter::WindowProcDelegateManager::~WindowProcDelegateManager
~WindowProcDelegateManager()
flutter::WindowProcDelegateManager::RegisterTopLevelWindowProcDelegate
void RegisterTopLevelWindowProcDelegate(FlutterDesktopWindowProcCallback callback, void *user_data)
Definition: window_proc_delegate_manager.cc:16
flutter_windows.h
FlutterDesktopWindowProcCallback
bool(* FlutterDesktopWindowProcCallback)(HWND, UINT, WPARAM, LPARAM, void *, LRESULT *result)
Definition: flutter_windows.h:275
user_data
void * user_data
Definition: flutter_windows_view_unittests.cc:53
callback
FlutterDesktopBinaryReply callback
Definition: flutter_windows_view_unittests.cc:52
message
Win32Message message
Definition: keyboard_unittests.cc:137
flutter
Definition: accessibility_bridge_windows.cc:11
flutter::WindowProcDelegate
std::function< std::optional< LRESULT >(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam)> WindowProcDelegate
Definition: plugin_registrar_windows.h:24