port from perforce

hgplus/bliss/Tweaky/EditorBase.cs

@@ -0,0 +1,82 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Text;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using Tweaky.PropertyGrid;
+
+namespace Tweaky
+{
+    public class EditorBase<T> : Control, INotifyPropertyChanged
+    {
+        static EditorBase()
+        {
+            DefaultStyleKeyProperty.OverrideMetadata(typeof(EditorBase<T>), new FrameworkPropertyMetadata(typeof(EditorBase<T>)));
+        }
+
+        public EditorBase()
+        {
+            this.DataContextChanged += EditorBase_DataContextChanged;
+        }
+
+        void EditorBase_DataContextChanged(object sender, DependencyPropertyChangedEventArgs e)
+        {
+            if (e.OldValue != null && e.OldValue is PropertyItem)
+                (e.OldValue as PropertyItem).PropertyChanged -= EditorBase_PropertyChanged;
+
+            if (e.NewValue != null && e.NewValue is PropertyItem)
+            {
+                (e.NewValue as PropertyItem).PropertyChanged -= EditorBase_PropertyChanged;
+                (e.NewValue as PropertyItem).PropertyChanged += EditorBase_PropertyChanged;
+            }
+        }
+
+        void EditorBase_PropertyChanged(object sender, PropertyChangedEventArgs e)
+        {
+            if (e.PropertyName == "Value")
+                OnValueChanged();
+        }
+
+        public event PropertyChangedEventHandler PropertyChanged;
+        public void RaisePropertyChanged(string propertyName)
+        {
+            if (PropertyChanged != null)
+                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
+        }
+
+        public virtual void OnValueChanged()
+        {
+            RaisePropertyChanged(null);
+        }
+
+        public float Step
+        {
+            get
+            {
+                return 1.0f;
+            }
+        }
+
+        public virtual T Value
+        {
+            get 
+            {
+                if (this.DataContext is PropertyItem)
+                    return (T)(this.DataContext as PropertyItem).Value;
+
+                return default(T);
+            }
+            set 
+            {
+                if (this.DataContext is PropertyItem)
+                {
+                    (this.DataContext as PropertyItem).Value = value; 
+                    OnValueChanged(); 
+                }
+            }
+        }
+    }
+}