creek

 1#include "flutter_window.h"
 2
 3#include <optional>
 4
 5#include "flutter/generated_plugin_registrant.h"
 6
 7FlutterWindow::FlutterWindow(const flutter::DartProject& project)
 8    : project_(project) {}
 9
10FlutterWindow::~FlutterWindow() {}
11
12bool FlutterWindow::OnCreate() {
13  if (!Win32Window::OnCreate()) {
14    return false;
15  }
16
17  RECT frame = GetClientArea();
18
19  // The size here must match the window dimensions to avoid unnecessary surface
20  // creation / destruction in the startup path.
21  flutter_controller_ = std::make_unique<flutter::FlutterViewController>(
22      frame.right - frame.left, frame.bottom - frame.top, project_);
23  // Ensure that basic setup of the controller was successful.
24  if (!flutter_controller_->engine() || !flutter_controller_->view()) {
25    return false;
26  }
27  RegisterPlugins(flutter_controller_->engine());
28  SetChildContent(flutter_controller_->view()->GetNativeWindow());
29
30  flutter_controller_->engine()->SetNextFrameCallback([&]() {
31    this->Show();
32  });
33
34  // Flutter can complete the first frame before the "show window" callback is
35  // registered. The following call ensures a frame is pending to ensure the
36  // window is shown. It is a no-op if the first frame hasn't completed yet.
37  flutter_controller_->ForceRedraw();
38
39  return true;
40}
41
42void FlutterWindow::OnDestroy() {
43  if (flutter_controller_) {
44    flutter_controller_ = nullptr;
45  }
46
47  Win32Window::OnDestroy();
48}
49
50LRESULT
51FlutterWindow::MessageHandler(HWND hwnd, UINT const message,
52                              WPARAM const wparam,
53                              LPARAM const lparam) noexcept {
54  // Give Flutter, including plugins, an opportunity to handle window messages.
55  if (flutter_controller_) {
56    std::optional<LRESULT> result =
57        flutter_controller_->HandleTopLevelWindowProc(hwnd, message, wparam,
58                                                      lparam);
59    if (result) {
60      return *result;
61    }
62  }
63
64  switch (message) {
65    case WM_FONTCHANGE:
66      flutter_controller_->engine()->ReloadSystemFonts();
67      break;
68  }
69
70  return Win32Window::MessageHandler(hwnd, message, wparam, lparam);
71}