Qt: Fix progress dialog cancelling

src/duckstation-qt/qtprogresscallback.cpp

@@ -16,16 +16,12 @@ QtModalProgressCallback::QtModalProgressCallback(QWidget* parent_widget, float s
   m_dialog.setModal(parent_widget != nullptr);
   m_dialog.setAutoClose(false);
   m_dialog.setAutoReset(false);
+  connect(&m_dialog, &QProgressDialog::canceled, this, &QtModalProgressCallback::dialogCancelled);
   checkForDelayedShow();
 }
 
 QtModalProgressCallback::~QtModalProgressCallback() = default;
 
-bool QtModalProgressCallback::IsCancelled() const
-{
-  return m_dialog.wasCanceled();
-}
-
 void QtModalProgressCallback::SetCancellable(bool cancellable)
 {
   if (m_cancellable == cancellable)
@@ -105,6 +101,11 @@ void QtModalProgressCallback::ModalInformation(const char* message)
   QMessageBox::information(&m_dialog, tr("Information"), QString::fromUtf8(message));
 }
 
+void QtModalProgressCallback::dialogCancelled()
+{
+  m_cancelled = true;
+}
+
 void QtModalProgressCallback::checkForDelayedShow()
 {
   if (m_dialog.isVisible())

src/duckstation-qt/qtprogresscallback.h

@@ -1,11 +1,13 @@
-// SPDX-FileCopyrightText: 2019-2022 Connor McLaughlin <stenzek@gmail.com>
+// SPDX-FileCopyrightText: 2019-2023 Connor McLaughlin <stenzek@gmail.com>
 // SPDX-License-Identifier: (GPL-3.0 OR CC-BY-NC-ND-4.0)
 
 #pragma once
+
 #include "common/progress_callback.h"
 #include "common/timer.h"
-#include <QtCore/QThread>
+
 #include <QtCore/QSemaphore>
+#include <QtCore/QThread>
 #include <QtWidgets/QProgressDialog>
 #include <atomic>
 
@@ -17,7 +19,7 @@ public:
   QtModalProgressCallback(QWidget* parent_widget, float show_delay = 0.0f);
   ~QtModalProgressCallback();
 
-  bool IsCancelled() const override;
+  QProgressDialog& GetDialog() { return m_dialog; }
 
   void SetCancellable(bool cancellable) override;
   void SetTitle(const char* title) override;
@@ -34,6 +36,9 @@ public:
   bool ModalConfirmation(const char* message) override;
   void ModalInformation(const char* message) override;
 
+private Q_SLOTS:
+  void dialogCancelled();
+
 private:
   void checkForDelayedShow();