Fix drag and drop

src/citra_qt/bootmanager.cpp

@@ -3,6 +3,7 @@
 // Refer to the license.txt file included.
 
 #include <QApplication>
+#include <QDragEnterEvent>
 #include <QHBoxLayout>
 #include <QKeyEvent>
 #include <QOffscreenSurface>
@@ -14,6 +15,7 @@
 #include <QWindow>
 #include <fmt/format.h>
 #include "citra_qt/bootmanager.h"
+#include "citra_qt/main.h"
 #include "common/microprofile.h"
 #include "common/scm_rev.h"
 #include "core/3ds.h"
@@ -31,6 +33,15 @@ EmuThread::EmuThread(Frontend::GraphicsContext& core_context) : core_context(cor
 
 EmuThread::~EmuThread() = default;
 
+static GMainWindow* GetMainWindow() {
+    for (QWidget* w : qApp->topLevelWidgets()) {
+        if (GMainWindow* main = qobject_cast<GMainWindow*>(w)) {
+            return main;
+        }
+    }
+    return nullptr;
+}
+
 void EmuThread::run() {
     MicroProfileOnThreadCreate("EmuThread");
     Frontend::ScopeAcquireContext scope(core_context);
@@ -138,6 +149,15 @@ bool OpenGLWindow::event(QEvent* event) {
     case QEvent::InputMethodQuery:
     case QEvent::TouchCancel:
         return QCoreApplication::sendEvent(event_handler, event);
+    case QEvent::Drop:
+        GetMainWindow()->DropAction(static_cast<QDropEvent*>(event));
+        return true;
+    case QEvent::DragResponse:
+    case QEvent::DragEnter:
+    case QEvent::DragLeave:
+    case QEvent::DragMove:
+        GetMainWindow()->AcceptDropEvent(static_cast<QDropEvent*>(event));
+        return true;
     default:
         return QWindow::event(event);
     }
@@ -298,15 +318,19 @@ void GRenderWindow::TouchEndEvent() {
 }
 
 bool GRenderWindow::event(QEvent* event) {
-    if (event->type() == QEvent::TouchBegin) {
+    switch (event->type()) {
+    case QEvent::TouchBegin:
         TouchBeginEvent(static_cast<QTouchEvent*>(event));
         return true;
-    } else if (event->type() == QEvent::TouchUpdate) {
+    case QEvent::TouchUpdate:
         TouchUpdateEvent(static_cast<QTouchEvent*>(event));
         return true;
-    } else if (event->type() == QEvent::TouchEnd || event->type() == QEvent::TouchCancel) {
+    case QEvent::TouchEnd:
+    case QEvent::TouchCancel:
         TouchEndEvent();
         return true;
+    default:
+        break;
     }
 
     return QWidget::event(event);

src/citra_qt/configuration/configure_hotkeys.cpp

@@ -105,10 +105,10 @@ void ConfigureHotkeys::ApplyConfiguration(HotkeyRegistry& registry) {
         for (int key_column_id = 0; key_column_id < parent->rowCount(); key_column_id++) {
             QStandardItem* action = parent->child(key_column_id, 0);
             QStandardItem* keyseq = parent->child(key_column_id, 1);
-            for (auto& [group, sub_actions] : registry.hotkey_groups) {
+            for (auto & [group, sub_actions] : registry.hotkey_groups) {
                 if (group != parent->text())
                     continue;
-                for (auto& [action_name, hotkey] : sub_actions) {
+                for (auto & [action_name, hotkey] : sub_actions) {
                     if (action_name != action->text())
                         continue;
                     hotkey.keyseq = QKeySequence(keyseq->text());

src/citra_qt/configuration/configure_web.cpp

@@ -127,11 +127,10 @@ void ConfigureWeb::OnLoginChanged() {
 void ConfigureWeb::VerifyLogin() {
     ui->button_verify_login->setDisabled(true);
     ui->button_verify_login->setText(tr("Verifying..."));
-    verify_watcher.setFuture(QtConcurrent::run(
-        [username = UsernameFromDisplayToken(ui->edit_token->text().toStdString()),
-         token = TokenFromDisplayToken(ui->edit_token->text().toStdString())] {
-            return Core::VerifyLogin(username, token);
-        }));
+    verify_watcher.setFuture(QtConcurrent::run([
+        username = UsernameFromDisplayToken(ui->edit_token->text().toStdString()),
+        token = TokenFromDisplayToken(ui->edit_token->text().toStdString())
+    ] { return Core::VerifyLogin(username, token); }));
 }
 
 void ConfigureWeb::OnLoginVerified() {

src/citra_qt/main.cpp

@@ -1869,14 +1869,33 @@ void GMainWindow::closeEvent(QCloseEvent* event) {
     QWidget::closeEvent(event);
 }
 
-static bool IsSingleFileDropEvent(QDropEvent* event) {
-    const QMimeData* mimeData = event->mimeData();
-    return mimeData->hasUrls() && mimeData->urls().length() == 1;
+static bool IsSingleFileDropEvent(const QMimeData* mime) {
+    return mime->hasUrls() && mime->urls().length() == 1;
 }
 
-void GMainWindow::dropEvent(QDropEvent* event) {
-    if (!IsSingleFileDropEvent(event)) {
-        return;
+static const std::array<std::string, 8> AcceptedExtensions = {"cci",  "3ds", "cxi", "bin",
+                                                              "3dsx", "app", "elf", "axf"};
+
+static bool IsCorrectFileExtension(const QMimeData* mime) {
+    const QString& filename = mime->urls().at(0).toLocalFile();
+    return std::find(AcceptedExtensions.begin(), AcceptedExtensions.end(),
+                     QFileInfo(filename).suffix().toStdString()) != AcceptedExtensions.end();
+}
+
+static bool IsAcceptableDropEvent(QDropEvent* event) {
+    return IsSingleFileDropEvent(event->mimeData()) && IsCorrectFileExtension(event->mimeData());
+}
+
+void GMainWindow::AcceptDropEvent(QDropEvent* event) {
+    if (IsAcceptableDropEvent(event)) {
+        event->setDropAction(Qt::DropAction::LinkAction);
+        event->accept();
+    }
+}
+
+bool GMainWindow::DropAction(QDropEvent* event) {
+    if (!IsAcceptableDropEvent(event)) {
+        return false;
     }
 
     const QMimeData* mime_data = event->mimeData();
@@ -1891,16 +1910,19 @@ void GMainWindow::dropEvent(QDropEvent* event) {
             BootGame(filename);
         }
     }
+    return true;
+}
+
+void GMainWindow::dropEvent(QDropEvent* event) {
+    DropAction(event);
 }
 
 void GMainWindow::dragEnterEvent(QDragEnterEvent* event) {
-    if (IsSingleFileDropEvent(event)) {
-        event->acceptProposedAction();
-    }
+    AcceptDropEvent(event);
 }
 
 void GMainWindow::dragMoveEvent(QDragMoveEvent* event) {
-    event->acceptProposedAction();
+    AcceptDropEvent(event);
 }
 
 bool GMainWindow::ConfirmChangeGame() {

src/citra_qt/main.h

@@ -41,6 +41,7 @@ class QProgressBar;
 class RegistersWidget;
 class Updater;
 class WaitTreeWidget;
+
 namespace DiscordRPC {
 class DiscordInterface;
 }
@@ -69,8 +70,12 @@ public:
     GameList* game_list;
     std::unique_ptr<DiscordRPC::DiscordInterface> discord_rpc;
 
+    bool DropAction(QDropEvent* event);
+    void AcceptDropEvent(QDropEvent* event);
+
 public slots:
     void OnAppFocusStateChanged(Qt::ApplicationState state);
+
 signals:
 
     /**
@@ -78,8 +83,8 @@ signals:
      * about to start. At this time, the core system emulation has been initialized, and all
      * emulation handles and memory should be valid.
      *
-     * @param emu_thread Pointer to the newly created EmuThread (to be used by widgets that need to
-     *      access/change emulation state).
+     * @param emu_thread Pointer to the newly created EmuThread (to be used by widgets that need
+     * to access/change emulation state).
      */
     void EmulationStarting(EmuThread* emu_thread);