1 files changed, 80 insertions, 0 deletions
diff --git a/src/ui/pref-pusher.h b/src/ui/pref-pusher.h
new file mode 100644
index 0000000..0d62266
--- /dev/null
+++ b/src/ui/pref-pusher.h
@@ -0,0 +1,80 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef SEEN_PREF_PUSHER_H
+#define SEEN_PREF_PUSHER_H
+
+#include "preferences.h"
+
+typedef struct _GtkToggleAction GtkToggleAction;
+
+namespace Inkscape {
+namespace UI {
+
+/**
+ * A simple mediator class that keeps UI controls matched to the preference values they set.
+ */
+class PrefPusher : public Inkscape::Preferences::Observer
+{
+public:
+    /**
+     * Constructor for a boolean value that syncs to the supplied path.
+     * Initializes the widget to the current preference stored state and registers callbacks
+     * for widget changes and preference changes.
+     *
+     * @param act the widget to synchronize preference with.
+     * @param path the path to the preference the widget is synchronized with.
+     * @param callback function to invoke when changes are pushed.
+     * @param cbData data to be passed on to the callback function.
+     */
+    PrefPusher( GtkToggleAction       *act,
+                Glib::ustring const &  path,
+                void (*callback)(gpointer) = nullptr,
+                gpointer cbData = nullptr );
+
+    /**
+     * Destructor that unregisters the preference callback.
+     */
+    ~PrefPusher() override;
+
+    /**
+     * Callback method invoked when the preference setting changes.
+     */
+    void notify(Inkscape::Preferences::Entry const &new_val) override;
+
+
+private:
+    /**
+     * Callback hook invoked when the widget changes.
+     *
+     * @param act the toggle action widget that was changed.
+     * @param self the PrefPusher instance the callback was registered to.
+     */
+   static void toggleCB( GtkToggleAction *act, PrefPusher *self );
+
+    /**
+     * Method to handle the widget change.
+     *
+     * @details Sets the observed path, based on the state of the toggle button
+     *          and then runs the callback function
+     */
+    void handleToggled();
+
+    GtkToggleAction *act;
+    void (*callback)(gpointer);
+    gpointer cbData;
+    bool freeze;
+};
+
+}
+}
+#endif
+
+/*
+  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 :