Host: Add ConfirmMessageAsync()

src/duckstation-qt/qthost.cpp

@@ -1917,6 +1917,18 @@ bool Host::ConfirmMessage(std::string_view title, std::string_view message)
                                              QString::fromUtf8(message.data(), message.size()));
 }
 
+void Host::ConfirmMessageAsync(std::string_view title, std::string_view message, ConfirmMessageAsyncCallback callback)
+{
+  QtHost::RunOnUIThread([title = QtUtils::StringViewToQString(title), message = QtUtils::StringViewToQString(message),
+                         callback = std::move(callback)]() mutable {
+    auto lock = g_main_window->pauseAndLockSystem();
+
+    const bool result = (QMessageBox::question(lock.getDialogParent(), title, message) != QMessageBox::No);
+
+    callback(result);
+  });
+}
+
 void Host::OpenURL(std::string_view url)
 {
   QtHost::RunOnUIThread([url = QtUtils::StringViewToQString(url)]() { QtUtils::OpenURL(g_main_window, QUrl(url)); });

src/duckstation-regtest/regtest_host.cpp

@@ -150,6 +150,16 @@ bool Host::ConfirmMessage(std::string_view title, std::string_view message)
   return true;
 }
 
+void Host::ConfirmMessageAsync(std::string_view title, std::string_view message, ConfirmMessageAsyncCallback callback)
+{
+  if (!title.empty() && !message.empty())
+    ERROR_LOG("ConfirmMessage: {}: {}", title, message);
+  else if (!message.empty())
+    ERROR_LOG("ConfirmMessage: {}", message);
+
+  callback(true);
+}
+
 void Host::ReportDebuggerMessage(std::string_view message)
 {
   ERROR_LOG("ReportDebuggerMessage: {}", message);

src/util/host.h

@@ -8,6 +8,7 @@
 #include "common/types.h"
 
 #include <ctime>
+#include <functional>
 #include <optional>
 #include <string>
 #include <string_view>
@@ -44,6 +45,11 @@ void ReportErrorAsync(std::string_view title, std::string_view message);
 /// Displays a synchronous confirmation on the UI thread, i.e. blocks the caller.
 bool ConfirmMessage(std::string_view title, std::string_view message);
 
+/// Displays an asynchronous confirmation on the UI thread, but does not block the caller.
+/// The callback may be executed on a different thread. Use RunOnCPUThread() in the callback to ensure safety.
+using ConfirmMessageAsyncCallback = std::function<void(bool)>;
+void ConfirmMessageAsync(std::string_view title, std::string_view message, ConfirmMessageAsyncCallback callback);
+
 /// Returns the user agent to use for HTTP requests.
 std::string GetHTTPUserAgent();