Implement discard functionality for line settings

scwx-qt/source/scwx/qt/settings/settings_category.cpp

@@ -4,6 +4,8 @@
 
 #include <algorithm>
 
+#include <boost/signals2/signal.hpp>
+
 namespace scwx
 {
 namespace qt
@@ -27,6 +29,8 @@ public:
                                       subcategoryArrays_;
    std::vector<SettingsCategory*>     subcategories_;
    std::vector<SettingsVariableBase*> variables_;
+
+   boost::signals2::signal<void()> resetSignal_;
 };
 
 SettingsCategory::SettingsCategory(const std::string& name) :
@@ -96,6 +100,32 @@ bool SettingsCategory::Commit()
    return committed;
 }
 
+void SettingsCategory::Reset()
+{
+   // Reset subcategory arrays
+   for (auto& subcategoryArray : p->subcategoryArrays_)
+   {
+      for (auto& subcategory : subcategoryArray.second)
+      {
+         subcategory->Reset();
+      }
+   }
+
+   // Reset subcategories
+   for (auto& subcategory : p->subcategories_)
+   {
+      subcategory->Reset();
+   }
+
+   // Reset variables
+   for (auto& variable : p->variables_)
+   {
+      variable->Reset();
+   }
+
+   p->resetSignal_();
+}
+
 bool SettingsCategory::ReadJson(const boost::json::object& json)
 {
    bool validated = true;
@@ -252,6 +282,12 @@ void SettingsCategory::RegisterVariables(
       p->variables_.end(), variables.cbegin(), variables.cend());
 }
 
+boost::signals2::connection
+SettingsCategory::RegisterResetCallback(std::function<void()> callback)
+{
+   return p->resetSignal_.connect(callback);
+}
+
 } // namespace settings
 } // namespace qt
 } // namespace scwx

scwx-qt/source/scwx/qt/settings/settings_category.hpp

@@ -6,6 +6,7 @@
 #include <string>
 
 #include <boost/json/object.hpp>
+#include <boost/signals2/connection.hpp>
 
 namespace scwx
 {
@@ -34,14 +35,18 @@ public:
    void SetDefaults();
 
    /**
-    * Sets the current value of all variables to the staged
-    * value.
+    * Sets the current value of all variables to the staged value.
     *
     * @return true if any staged value was committed, false if no staged values
     * are present.
     */
    bool Commit();
 
+   /**
+    * Clears the staged value of all variables.
+    */
+   void Reset();
+
    /**
     * Reads the variables from the JSON object.
     *
@@ -68,6 +73,14 @@ public:
    RegisterVariables(std::initializer_list<SettingsVariableBase*> variables);
    void RegisterVariables(std::vector<SettingsVariableBase*> variables);
 
+   /**
+    * Registers a function to be called when the category is reset.
+    *
+    * @param callback Function to be called
+    */
+   boost::signals2::connection
+   RegisterResetCallback(std::function<void()> callback);
+
 private:
    class Impl;
    std::unique_ptr<Impl> p;

scwx-qt/source/scwx/qt/settings/settings_variable.hpp

@@ -29,7 +29,7 @@ public:
    typedef std::function<void(const T& value)> ValueCallbackFunction;
 
    explicit SettingsVariable(const std::string& name);
-   ~SettingsVariable();
+   virtual ~SettingsVariable();
 
    SettingsVariable(const SettingsVariable&)            = delete;
    SettingsVariable& operator=(const SettingsVariable&) = delete;
@@ -96,7 +96,7 @@ public:
    /**
     * Clears the staged value of the settings variable.
     */
-   void Reset();
+   void Reset() override;
 
    /**
     * Gets the staged value of the settings variable, if defined.

scwx-qt/source/scwx/qt/settings/settings_variable_base.hpp

@@ -19,7 +19,7 @@ class SettingsVariableBase
 {
 protected:
    explicit SettingsVariableBase(const std::string& name);
-   ~SettingsVariableBase();
+   virtual ~SettingsVariableBase();
 
 public:
    SettingsVariableBase(const SettingsVariableBase&)            = delete;
@@ -48,6 +48,11 @@ public:
     */
    virtual bool Commit() = 0;
 
+   /**
+    * Clears the staged value of the settings variable.
+    */
+   virtual void Reset() = 0;
+
    /**
     * Reads the value from the JSON object. If the read value is out of range,
     * the value is set to the minimum or maximum. If the read value fails