67 lines
2.1 KiB
C++
67 lines
2.1 KiB
C++
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#include "run_loop.h"
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#include <windows.h>
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#include <algorithm>
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RunLoop::RunLoop() {}
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RunLoop::~RunLoop() {}
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void RunLoop::Run() {
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bool keep_running = true;
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TimePoint next_flutter_event_time = TimePoint::clock::now();
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while (keep_running) {
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std::chrono::nanoseconds wait_duration =
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std::max(std::chrono::nanoseconds(0),
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next_flutter_event_time - TimePoint::clock::now());
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::MsgWaitForMultipleObjects(
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0, nullptr, FALSE, static_cast<DWORD>(wait_duration.count() / 1000),
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QS_ALLINPUT);
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bool processed_events = false;
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MSG message;
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// All pending Windows messages must be processed; MsgWaitForMultipleObjects
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// won't return again for items left in the queue after PeekMessage.
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while (::PeekMessage(&message, nullptr, 0, 0, PM_REMOVE)) {
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processed_events = true;
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if (message.message == WM_QUIT) {
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keep_running = false;
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break;
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}
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::TranslateMessage(&message);
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::DispatchMessage(&message);
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// Allow Flutter to process messages each time a Windows message is
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// processed, to prevent starvation.
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next_flutter_event_time =
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std::min(next_flutter_event_time, ProcessFlutterMessages());
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}
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// If the PeekMessage loop didn't run, process Flutter messages.
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if (!processed_events) {
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next_flutter_event_time =
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std::min(next_flutter_event_time, ProcessFlutterMessages());
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}
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}
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}
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void RunLoop::RegisterFlutterInstance(
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flutter::FlutterEngine* flutter_instance) {
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flutter_instances_.insert(flutter_instance);
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}
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void RunLoop::UnregisterFlutterInstance(
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flutter::FlutterEngine* flutter_instance) {
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flutter_instances_.erase(flutter_instance);
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}
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RunLoop::TimePoint RunLoop::ProcessFlutterMessages() {
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TimePoint next_event_time = TimePoint::max();
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for (auto instance : flutter_instances_) {
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std::chrono::nanoseconds wait_duration = instance->ProcessMessages();
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if (wait_duration != std::chrono::nanoseconds::max()) {
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next_event_time =
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std::min(next_event_time, TimePoint::clock::now() + wait_duration);
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}
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}
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return next_event_time;
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}
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