update to trunk

(bzr r11950.1.287)

1 files changed, 70 insertions, 0 deletions

diff --git a/src/util/signal-blocker.h b/src/util/signal-blocker.h
new file mode 100644
index 000000000..06d9736f2
--- /dev/null
+++ b/src/util/signal-blocker.h
@@ -0,0 +1,70 @@
+/*
+ * Base RAII blocker for sgic++ signals.
+ *
+ * Authors:
+ *   Jon A. Cruz <jon@joncruz.org>
+ *
+ * Copyright (C) 2014 Authors
+ *
+ * Released under GNU GPL, read the file 'COPYING' for more information
+ */
+
+#ifndef SEEN_INKSCAPE_UTIL_SIGNAL_BLOCKER_H
+#define SEEN_INKSCAPE_UTIL_SIGNAL_BLOCKER_H
+
+#include <string>
+#include <sigc++/connection.h>
+
+/**
+ * Base RAII blocker for sgic++ signals.
+ */
+class SignalBlocker
+{
+public:
+    /**
+     * Creates a new instance that if the signal is currently unblocked will block
+     * it until this instance is destructed and then will unblock it.
+     */
+    SignalBlocker( sigc::connection *connection ) :
+        _connection(connection),
+        _wasBlocked(_connection->blocked())
+    {
+        if (!_wasBlocked)
+        {
+            _connection->block();
+        }
+    }
+
+    /**
+     * Destructor that will unblock the signal if it was blocked initially by this
+     * instance.
+     */
+    ~SignalBlocker()
+    {
+        if (!_wasBlocked)
+        {
+            _connection->block(false);
+        }
+    }
+
+private:
+    // noncopyable, nonassignable
+    SignalBlocker(SignalBlocker const &other);
+    SignalBlocker& operator=(SignalBlocker const &other);
+    
+    sigc::connection *_connection;
+    bool _wasBlocked;
+};
+
+#endif // SEEN_INKSCAPE_UTIL_SIGNAL_BLOCKER_H
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :