| Flutter Windows Embedder |

Public Member Functions | List of all members
flutter::WindowManager Class Reference

`#include <window_manager.h>`

## Public Member Functions
| WindowManager (FlutterWindowsEngine *engine)
virtual | ~WindowManager ()=default
void | Initialize (const WindowingInitRequest *request)
bool | HasTopLevelWindows () const
FlutterViewId | CreateRegularWindow (const WindowCreationRequest *request)
std::optional< LRESULT > | HandleMessage (HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam)
void | OnEngineShutdown ()

## Detailed Description

Definition at line 57 of file window_manager.h.

## Constructor & Destructor Documentation

## ◆ WindowManager()

flutter::WindowManager::WindowManager | ( | FlutterWindowsEngine * | engine | ) |
| explicit

Definition at line 23 of file window_manager.cc.

23 : engine_(engine) {}

## ◆ ~WindowManager()

virtual flutter::WindowManager::~WindowManager | ( |  | ) |
| virtual default

## Member Function Documentation

## ◆ CreateRegularWindow()

FlutterViewId flutter::WindowManager::CreateRegularWindow | ( | const WindowCreationRequest * | request | ) |

Definition at line 34 of file window_manager.cc.

35 {
36 auto window =
37 HostWindow::CreateRegularWindow(this, engine_, request->content_size);
38 if (!window || !window->GetWindowHandle()) {
39 FML_LOG(ERROR) << "Failed to create host window";
40 return -1;
41 }
42 FlutterViewId const view_id = window->view_controller_->view()->view_id();
43 active_windows_[window->GetWindowHandle()] = std::move(window);
44 return view_id;
45 }
flutter::HostWindow::CreateRegularWindow
static std::unique_ptr< HostWindow > CreateRegularWindow(WindowManager *controller, FlutterWindowsEngine *engine, const WindowSizing &content_size)
Definition: host_window.cc:200
flutter::FlutterViewId
int64_t FlutterViewId
Definition: flutter_view.h:13

References flutter::WindowCreationRequest::content_size, and flutter::HostWindow::CreateRegularWindow().

Referenced by InternalFlutterWindows_WindowManager_CreateRegularWindow().

## ◆ HandleMessage()

std::optional< LRESULT > flutter::WindowManager::HandleMessage | ( | HWND | hwnd,
|  | UINT | message,
|  | WPARAM | wparam,
|  | LPARAM | lparam
| ) |  |

Definition at line 63 of file window_manager.cc.

66 {
67 if (message == WM_NCDESTROY) {
68 active_windows_.erase(hwnd);
69 }
70
71 FlutterWindowsView* view = engine_->GetViewFromTopLevelWindow(hwnd);
72 if (!view) {
73 FML_LOG(WARNING) << "Received message for unknown view";
74 return std::nullopt;
75 }
76
77 WindowsMessage message_struct = {.view_id = view->view_id(),
78 .hwnd = hwnd,
79 .message = message,
80 .wParam = wparam,
81 .lParam = lparam,
82 .result = 0,
83 .handled = false};
84
85 // Not initialized yet.
86 if (!isolate_) {
87 return std::nullopt;
88 }
89
90 IsolateScope scope(*isolate_);
91 on_message_(&message_struct);
92 if (message_struct.handled) {
93 return message_struct.result;
94 } else {
95 return std::nullopt;
96 }
97 }
flutter::FlutterWindowsEngine::GetViewFromTopLevelWindow
FlutterWindowsView * GetViewFromTopLevelWindow(HWND hwnd) const
Definition: flutter_windows_engine.cc:855
flutter::FlutterWindowsView::view_id
FlutterViewId view_id() const
Definition: flutter_windows_view.cc:709
message
Win32Message message
Definition: keyboard_unittests.cc:137

References flutter::FlutterWindowsEngine::GetViewFromTopLevelWindow(), flutter::WindowsMessage::handled, message, flutter::WindowsMessage::result, flutter::FlutterWindowsView::view_id(), and flutter::WindowsMessage::view_id.

## ◆ HasTopLevelWindows()

bool flutter::WindowManager::HasTopLevelWindows | ( |  | ) | const

Definition at line 30 of file window_manager.cc.

30 {
31 return !active_windows_.empty();
32 }

Referenced by InternalFlutterWindows_WindowManager_HasTopLevelWindows().

## ◆ Initialize()

void flutter::WindowManager::Initialize | ( | const WindowingInitRequest * | request | ) |

Definition at line 25 of file window_manager.cc.

25 {
26 on_message_ = request->on_message;
27 isolate_ = Isolate::Current();
28 }
flutter::Isolate::Current
static Isolate Current()
Definition: isolate_scope.cc:9

References flutter::Isolate::Current(), and flutter::WindowingInitRequest::on_message.

Referenced by InternalFlutterWindows_WindowManager_Initialize().

## ◆ OnEngineShutdown()

void flutter::WindowManager::OnEngineShutdown | ( |  | ) |

Definition at line 47 of file window_manager.cc.

47 {
48 // Don't send any more messages to isolate.
49 on_message_ = nullptr;
50 std::vector<HWND> active_handles;
51 active_handles.reserve(active_windows_.size());
52 for (auto& [hwnd, window] : active_windows_) {
53 active_handles.push_back(hwnd);
54 }
55 for (auto hwnd : active_handles) {
56 // This will destroy the window, which will in turn remove the
57 // HostWindow from map when handling WM_NCDESTROY inside
58 // HandleMessage.
59 DestroyWindow(hwnd);
60 }
61 }

The documentation for this class was generated from the following files:

- shell/platform/windows/window_manager.h
- shell/platform/windows/window_manager.cc