languages

A collection of programs made with different programming languages.
git clone git://evanalba.com/languages
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flutter_window.cpp (2122B)

      1 #include "flutter_window.h"
      2 
      3 #include <optional>
      4 
      5 #include "flutter/generated_plugin_registrant.h"
      6 
      7 FlutterWindow::FlutterWindow(const flutter::DartProject& project)
      8     : project_(project) {}
      9 
     10 FlutterWindow::~FlutterWindow() {}
     11 
     12 bool 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 
     42 void FlutterWindow::OnDestroy() {
     43   if (flutter_controller_) {
     44     flutter_controller_ = nullptr;
     45   }
     46 
     47   Win32Window::OnDestroy();
     48 }
     49 
     50 LRESULT
     51 FlutterWindow::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 }