GAbstractView: Add on_selection callback.

This callback is fired whenever the model's selection is updated.
Note that it only fires when there is a model, and when the index is valid.

2 files changed, 3 insertions, 0 deletions

diff --git a/LibGUI/GAbstractView.cpp b/LibGUI/GAbstractView.cpp
index 2f7c410592..300ede4a6e 100644
--- a/LibGUI/GAbstractView.cpp
+++ b/LibGUI/GAbstractView.cpp
@@ -44,6 +44,8 @@ void GAbstractView::did_update_selection()
 {
     if (!model() || model()->selected_index() != m_edit_index)
         stop_editing();
+    if (model() && on_selection && model()->selected_index().is_valid())
+        on_selection(model()->selected_index());
 }
 
 void GAbstractView::did_scroll()
diff --git a/LibGUI/GAbstractView.h b/LibGUI/GAbstractView.h
index 1a517c0c16..f57a65c919 100644
--- a/LibGUI/GAbstractView.h
+++ b/LibGUI/GAbstractView.h
@@ -32,6 +32,7 @@ public:
     bool activates_on_selection() const { return m_activates_on_selection; }
 
     Function<void(const GModelIndex&)> on_activation;
+    Function<void(const GModelIndex&)> on_selection;
     Function<void(const GModelNotification&)> on_model_notification;
 
     virtual const char* class_name() const override { return "GAbstractView"; }