Simple MVC based binding mechanism for android controls.
Change-Id: I80fe18e0e15f8a840d558de9863650505bd5fb00
diff --git a/core/java/android/widget/ValueEditor.java b/core/java/android/widget/ValueEditor.java
new file mode 100755
index 0000000..2b91abf
--- /dev/null
+++ b/core/java/android/widget/ValueEditor.java
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.widget;
+
+import android.util.ValueModel;
+
+/**
+ * An interface for editors of simple values. Classes implementing this interface are normally
+ * UI controls (subclasses of {@link android.view.View View}) that can provide a suitable
+ * user interface to display and edit values of the specified type. This interface is
+ * intended to describe editors for simple types, like {@code boolean}, {@code int} or
+ * {@code String}, where the values themselves are immutable.
+ * <p>
+ * For example, {@link android.widget.CheckBox CheckBox} implements
+ * this interface for the Boolean type as it is capable of providing an appropriate
+ * mechanism for displaying and changing the value of a Boolean property.
+ *
+ * @param <T> the value type that this editor supports
+ */
+public interface ValueEditor<T> {
+ /**
+ * Return the last value model that was set. If no value model has been set, the editor
+ * should return the value {@link android.util.ValueModel#EMPTY}.
+ *
+ * @return the value model
+ */
+ public ValueModel<T> getValueModel();
+
+ /**
+ * Sets the value model for this editor. When the value model is set, the editor should
+ * retrieve the value from the value model, using {@link android.util.ValueModel#get()},
+ * and set its internal state accordingly. Likewise, when the editor's internal state changes
+ * it should update the value model by calling {@link android.util.ValueModel#set(T)}
+ * with the appropriate value.
+ *
+ * @param valueModel the new value model for this editor.
+ */
+ public void setValueModel(ValueModel<T> valueModel);
+}