1 files changed, 38 insertions, 0 deletions
diff --git a/src/ui/operation-blocker.h b/src/ui/operation-blocker.h
new file mode 100644
index 0000000..b9d714c
--- /dev/null
+++ b/src/ui/operation-blocker.h
@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#ifndef SEEN_OPERATION_BLOCKER_H
+#define SEEN_OPERATION_BLOCKER_H
+
+// cooperative counter-based pending operation blocking
+
+class OperationBlocker {
+public:
+    OperationBlocker() = default;
+    
+    bool pending() const {
+        return _counter > 0;
+    }
+
+    class scoped_block {
+    public:
+        scoped_block(unsigned int& counter): _c(counter) {
+            ++_c;
+        }
+
+        ~scoped_block() {
+            --_c;
+        }
+
+    private:
+        unsigned int& _c;
+    };
+
+    scoped_block block() {
+        return scoped_block(_counter);
+    }
+
+private:
+    unsigned int _counter = 0;
+};
+
+#endif
+\ No newline at end of file