Qt: Center windows when they don't have saved positions

Stupid Linux decides to spawn it in the top-left corner of the screen
otherwise.

src/duckstation-qt/autoupdaterwindow.cpp

@@ -77,7 +77,7 @@ static const char* UPDATE_ASSET_FILENAME = SCM_RELEASE_ASSET;
 
 LOG_CHANNEL(Host);
 
-AutoUpdaterWindow::AutoUpdaterWindow(QWidget* parent /* = nullptr */) : QWidget(parent)
+AutoUpdaterWindow::AutoUpdaterWindow() : QWidget()
 {
   m_ui.setupUi(this);
   setWindowIcon(QtHost::GetAppIcon());
@@ -91,6 +91,8 @@ AutoUpdaterWindow::AutoUpdaterWindow(QWidget* parent /* = nullptr */) : QWidget(
   m_http = HTTPDownloader::Create(Host::GetHTTPUserAgent(), &error);
   if (!m_http)
     ERROR_LOG("Failed to create HTTP downloader, auto updater will not be available:\n{}", error.GetDescription());
+
+  QtUtils::CenterWindowRelativeToParent(this, g_main_window);
 }
 
 AutoUpdaterWindow::~AutoUpdaterWindow() = default;

src/duckstation-qt/autoupdaterwindow.h

@@ -26,7 +26,7 @@ class AutoUpdaterWindow final : public QWidget
   Q_OBJECT
 
 public:
-  explicit AutoUpdaterWindow(QWidget* parent = nullptr);
+  explicit AutoUpdaterWindow();
   ~AutoUpdaterWindow();
 
   void queueUpdateCheck(bool display_errors);

src/duckstation-qt/controllersettingswindow.cpp

@@ -104,7 +104,10 @@ ControllerSettingsWindow::ControllerSettingsWindow(INISettingsInterface* game_si
   createWidgets();
 
   if (isEditingGlobalSettings())
-    QtUtils::RestoreWindowGeometry("ControllerSettingsWindow", this);
+  {
+    if (!QtUtils::RestoreWindowGeometry("ControllerSettingsWindow", this))
+      QtUtils::CenterWindowRelativeToParent(this, g_main_window);
+  }
 }
 
 ControllerSettingsWindow::~ControllerSettingsWindow() = default;

src/duckstation-qt/debuggerwindow.cpp

@@ -476,7 +476,8 @@ void DebuggerWindow::setupAdditionalUi()
   setCentralWidget(nullptr);
   delete m_ui.centralwidget;
 
-  QtUtils::RestoreWindowGeometry("DebuggerWindow", this);
+  if (!QtUtils::RestoreWindowGeometry("DebuggerWindow", this))
+    QtUtils::CenterWindowRelativeToParent(this, g_main_window);
 }
 
 void DebuggerWindow::connectSignals()

src/duckstation-qt/isobrowserwindow.cpp

@@ -2,6 +2,7 @@
 // SPDX-License-Identifier: CC-BY-NC-ND-4.0
 
 #include "isobrowserwindow.h"
+#include "mainwindow.h"
 #include "qtprogresscallback.h"
 #include "qtutils.h"
 
@@ -39,6 +40,8 @@ ISOBrowserWindow::ISOBrowserWindow(QWidget* parent) : QWidget(parent)
   connect(m_ui.fileView, &QTreeWidget::itemSelectionChanged, this, &ISOBrowserWindow::onFileItemSelectionChanged);
   connect(m_ui.fileView, &QTreeWidget::customContextMenuRequested, this, &ISOBrowserWindow::onFileContextMenuRequested);
   connect(m_ui.close, &QAbstractButton::clicked, this, &ISOBrowserWindow::close);
+
+  QtUtils::CenterWindowRelativeToParent(this, g_main_window);
 }
 
 ISOBrowserWindow::~ISOBrowserWindow() = default;

src/duckstation-qt/memorycardeditorwindow.cpp

@@ -2,6 +2,7 @@
 // SPDX-License-Identifier: CC-BY-NC-ND-4.0
 
 #include "memorycardeditorwindow.h"
+#include "mainwindow.h"
 #include "qtutils.h"
 
 #include "core/host.h"
@@ -166,6 +167,8 @@ MemoryCardEditorWindow::MemoryCardEditorWindow() : QWidget()
   m_animation_timer = new QTimer(this);
   m_animation_timer->setInterval(MEMORY_CARD_ICON_FRAME_DURATION_MS);
   connect(m_animation_timer, &QTimer::timeout, this, &MemoryCardEditorWindow::incrementAnimationFrame);
+
+  QtUtils::CenterWindowRelativeToParent(this, g_main_window);
 }
 
 MemoryCardEditorWindow::~MemoryCardEditorWindow() = default;

src/duckstation-qt/memoryeditorwindow.cpp

@@ -399,7 +399,8 @@ void MemoryEditorWindow::setupAdditionalUi()
 #endif
   m_ui.memoryView->setFont(fixedFont);
 
-  QtUtils::RestoreWindowGeometry("MemoryEditorWindow", this);
+  if (!QtUtils::RestoreWindowGeometry("MemoryEditorWindow", this))
+    QtUtils::CenterWindowRelativeToParent(this, g_main_window);
 
   // Set minimum width for data inspector.
   m_ui.dataInspectorAddress->setFont(fixedFont);

src/duckstation-qt/memoryscannerwindow.cpp

@@ -104,7 +104,8 @@ void MemoryScannerWindow::setupAdditionalUi()
 {
   QtUtils::SetColumnWidthsForTableView(m_ui.scanTable, {-1, 100, 100, 100});
   QtUtils::SetColumnWidthsForTableView(m_ui.watchTable, {-1, 100, 100, 150, 40});
-  QtUtils::RestoreWindowGeometry("MemoryScannerWindow", this);
+  if (!QtUtils::RestoreWindowGeometry("MemoryScannerWindow", this))
+    QtUtils::CenterWindowRelativeToParent(this, g_main_window);
 }
 
 void MemoryScannerWindow::connectUi()

src/duckstation-qt/qtutils.cpp

@@ -629,6 +629,22 @@ bool QtUtils::RestoreWindowGeometry(std::string_view window_name, QWidget* widge
   return true;
 }
 
+void QtUtils::CenterWindowRelativeToParent(QWidget* window, QWidget* parent_window)
+{
+  // la la la, this won't work on fucking wankland, I don't care, it'll appear in the top-left
+  // corner of the screen or whatever, shit experience is shit
+
+  const QRect parent_geometry = (parent_window && parent_window->isVisible()) ?
+                                  parent_window->geometry() :
+                                  QGuiApplication::primaryScreen()->availableGeometry();
+  const QPoint parent_center_pos = parent_geometry.center();
+
+  QRect window_geometry = window->geometry();
+  window_geometry.moveCenter(parent_center_pos);
+
+  window->setGeometry(window_geometry);
+}
+
 bool QtUtils::TryMigrateWindowGeometry(SettingsInterface* si, std::string_view window_name, QWidget* widget)
 {
   // can we migrate old configuration?

src/duckstation-qt/qtutils.h

@@ -156,6 +156,9 @@ void SaveWindowGeometry(std::string_view window_name, QWidget* widget, bool auto
 /// Restores a window's geometry from configuration. Returns false if it was not found in the configuration.
 bool RestoreWindowGeometry(std::string_view window_name, QWidget* widget);
 
+/// Positions a window in the center of its parent or the screen.
+void CenterWindowRelativeToParent(QWidget* window, QWidget* parent_window);
+
 /// CPU-friendly way of blocking the UI thread while some predicate holds true.
 template<typename Predicate>
 inline void ProcessEventsWithSleep(QEventLoop::ProcessEventsFlags flags, const Predicate& pred, int sleep_time_ms = 10)

src/duckstation-qt/settingswindow.cpp

@@ -48,7 +48,8 @@ SettingsWindow::SettingsWindow() : QWidget()
   addPages();
   connectUi();
 
-  QtUtils::RestoreWindowGeometry("SettingsWindow", this);
+  if (!QtUtils::RestoreWindowGeometry("SettingsWindow", this))
+    QtUtils::CenterWindowRelativeToParent(this, g_main_window);
 }
 
 SettingsWindow::SettingsWindow(const GameList::Entry* entry, std::unique_ptr<INISettingsInterface> sif)
@@ -67,6 +68,8 @@ SettingsWindow::SettingsWindow(const GameList::Entry* entry, std::unique_ptr<INI
   connectUi();
 
   s_open_game_properties_dialogs.push_back(this);
+
+  QtUtils::CenterWindowRelativeToParent(this, g_main_window);
 }
 
 SettingsWindow::~SettingsWindow()