1 files changed, 65 insertions, 0 deletions
diff --git a/src/ui/simple-pref-pusher.h b/src/ui/simple-pref-pusher.h
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+++ b/src/ui/simple-pref-pusher.h
@@ -0,0 +1,65 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef SEEN_SIMPLE_PREF_PUSHER_H
+#define SEEN_SIMPLE_PREF_PUSHER_H
+
+#include "preferences.h"
+
+namespace Gtk {
+class ToggleToolButton;
+}
+
+namespace Inkscape {
+namespace UI {
+
+/**
+ * A simple mediator class that sets the state of a Gtk::ToggleToolButton when
+ * a preference is changed.  Unlike the PrefPusher class, this does not provide
+ * the reverse process, so you still need to write your own handler for the
+ * "toggled" signal on the ToggleToolButton.
+ */
+class SimplePrefPusher : 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.
+     */
+    SimplePrefPusher(Gtk::ToggleToolButton *btn,
+                     Glib::ustring const &  path);
+
+    /**
+     * Destructor that unregisters the preference callback.
+     */
+    ~SimplePrefPusher() override;
+
+    /**
+     * Callback method invoked when the preference setting changes.
+     */
+    void notify(Inkscape::Preferences::Entry const &new_val) override;
+
+
+private:
+    Gtk::ToggleToolButton *_btn;
+    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 :