LibGUI: Add a mode where GTableModel automatically activates on selection.

Applications/IRCClient/IRCClientWindowListModel.cpp

@@ -7,6 +7,7 @@
 IRCClientWindowListModel::IRCClientWindowListModel(IRCClient& client)
     : m_client(client)
 {
+    set_activates_on_selection(true);
 }
 
 IRCClientWindowListModel::~IRCClientWindowListModel()

LibGUI/GModelIndex.h

@@ -13,6 +13,8 @@ public:
     int row() const { return m_row; }
     int column() const { return m_column; }
 
+    bool operator==(const GModelIndex& other) const { return m_row == other.m_row && m_column == other.m_column; }
+
 private:
     int m_row { -1 };
     int m_column { -1 };

LibGUI/GTableModel.cpp

@@ -33,3 +33,14 @@ void GTableModel::did_update()
         view.did_update_model();
     });
 }
+
+void GTableModel::set_selected_index(const GModelIndex& index)
+{
+    if (m_selected_index == index)
+        return;
+    m_selected_index = index;
+    if (on_selection_changed)
+        on_selection_changed(index);
+    if (m_activates_on_selection && is_valid(index))
+        activate(index);
+}

LibGUI/GTableModel.h

@@ -58,9 +58,12 @@ public:
         return index.row() >= 0 && index.row() < row_count() && index.column() >= 0 && index.column() < column_count();
     }
 
-    void set_selected_index(const GModelIndex& index) { m_selected_index = index; }
+    void set_selected_index(const GModelIndex&);
     GModelIndex selected_index() const { return m_selected_index; }
 
+    bool activates_on_selection() const { return m_activates_on_selection; }
+    void set_activates_on_selection(bool b) { m_activates_on_selection = b; }
+
     virtual int key_column() const { return -1; }
     virtual GSortOrder sort_order() const { return GSortOrder::None; }
     virtual void set_key_column_and_sort_order(int, GSortOrder) { }
@@ -69,6 +72,7 @@ public:
     void unregister_view(Badge<GTableView>, GTableView&);
 
     Function<void(GTableModel&)> on_model_update;
+    Function<void(const GModelIndex&)> on_selection_changed;
 
 protected:
     GTableModel();
@@ -79,4 +83,5 @@ protected:
 private:
     HashTable<GTableView*> m_views;
     GModelIndex m_selected_index;
+    bool m_activates_on_selection { false };
 };