Implement UrlSchemeEventFilter

Took 10 minutes

Took 7 seconds

cockatrice/src/client/url_scheme_event_filter.h

@@ -0,0 +1,54 @@
+#ifndef COCKATRICE_URL_SCHEME_EVENT_FILTER_H
+#define COCKATRICE_URL_SCHEME_EVENT_FILTER_H
+
+#include <QEvent>
+#include <QFileOpenEvent>
+#include <QObject>
+#include <QString>
+
+/**
+ * @brief Event filter that catches QFileOpenEvent URLs matching a scheme
+ *        prefix and re-emits them as urlReceived().
+ *
+ * On macOS, when the application is registered as a URL scheme handler, the
+ * OS delivers incoming URLs via QFileOpenEvent on the QApplication object.
+ * Install this filter on QApplication to intercept them:
+ *
+ * @code
+ *   UrlSchemeEventFilter filter(QStringLiteral("cockatrice://"));
+ *   QObject::connect(&filter, &UrlSchemeEventFilter::urlReceived,
+ *                    &mainWindow, &MainWindow::handleUrl);
+ *   app.installEventFilter(&filter);
+ * @endcode
+ */
+class UrlSchemeEventFilter : public QObject
+{
+    Q_OBJECT
+
+public:
+    explicit UrlSchemeEventFilter(const QString &schemePrefix, QObject *parent = nullptr)
+        : QObject(parent), m_prefix(schemePrefix)
+    {
+    }
+
+signals:
+    void urlReceived(const QString &url);
+
+public:
+    bool eventFilter(QObject *watched, QEvent *event) override
+    {
+        if (event->type() == QEvent::FileOpen) {
+            const QString url = static_cast<QFileOpenEvent *>(event)->url().toString();
+            if (url.startsWith(m_prefix)) {
+                emit urlReceived(url);
+                return true;
+            }
+        }
+        return QObject::eventFilter(watched, event);
+    }
+
+private:
+    QString m_prefix;
+};
+
+#endif // COCKATRICE_URL_SCHEME_EVENT_FILTER_H

cockatrice/src/main.cpp

@@ -23,6 +23,7 @@
 #include "client/network/update/card_spoiler/spoiler_background_updater.h"
 #include "client/settings/cache_settings.h"
 #include "client/sound_engine.h"
+#include "client/url_scheme_event_filter.h"
 #include "database/interface/settings_card_preference_provider.h"
 #include "interface/intents/intent_open_local_deck.h"
 #include "interface/intents/url_parser.h"