Added value actions for common value types; drop down list is now correctly aligned

git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@92 0fc631ac-6414-0410-93d0-97cfa31319b6

src/data/action/value.cpp

@@ -0,0 +1,62 @@
+//+----------------------------------------------------------------------------+
+//| Description:  Magic Set Editor - Program to make Magic (tm) cards          |
+//| Copyright:    (C) 2001 - 2006 Twan van Laarhoven                           |
+//| License:      GNU General Public License 2 or later (see file COPYING)     |
+//+----------------------------------------------------------------------------+
+
+// ----------------------------------------------------------------------------- : Includes
+
+#include <data/action/value.hpp>
+#include <data/field.hpp>
+#include <data/field/text.hpp>
+#include <data/field/choice.hpp>
+#include <data/field/multiple_choice.hpp>
+#include <data/field/color.hpp>
+#include <data/field/image.hpp>
+#include <data/field/symbol.hpp>
+
+// ----------------------------------------------------------------------------- : ValueAction
+
+String ValueAction::getName(bool to_undo) const {
+	return _("Change ") + valueP->fieldP->name;
+}
+
+// ----------------------------------------------------------------------------- : Simple
+
+/// A ValueAction that swaps between old and new values
+template <typename T, typename T::ValueType T::*member, bool ALLOW_MERGE>
+class SimpleValueAction : public ValueAction {
+  public:
+	inline SimpleValueAction(const shared_ptr<T>& value, const typename T::ValueType& new_value)
+		: ValueAction(value), new_value(new_value)
+	{}
+	
+	virtual void perform(bool to_undo) {
+		swap(static_cast<T&>(*valueP).*member, new_value);
+	}
+	
+	virtual bool merge(const Action* action) {
+		if (!ALLOW_MERGE) return false;
+		if (const SimpleValueAction* sva = dynamic_cast<const SimpleValueAction*>(action)) {
+			if (sva->valueP == valueP) {
+				// adjacent actions on the same value, discard the other one,
+				// because it only keeps an intermediate value
+				return true;
+			}
+		} else {
+			return false;
+		}
+		return false;
+	}
+	
+  private:
+	typename T::ValueType new_value;
+};
+
+ValueAction* value_action(const ChoiceValueP& value, const Defaultable<String>& new_value) { return new SimpleValueAction<ChoiceValue, &ChoiceValue::value,    true> (value, new_value); }
+ValueAction* value_action(const ColorValueP&  value, const Defaultable<Color>&  new_value) { return new SimpleValueAction<ColorValue,  &ColorValue::value,     true> (value, new_value); }
+ValueAction* value_action(const ImageValueP&  value, const FileName&            new_value) { return new SimpleValueAction<ImageValue,  &ImageValue::filename,  false>(value, new_value); }
+ValueAction* value_action(const SymbolValueP& value, const FileName&            new_value) { return new SimpleValueAction<SymbolValue, &SymbolValue::filename, false>(value, new_value); }
+
+
+// ----------------------------------------------------------------------------- : Text