wpftoolkit/Main/Source/ExtendedWPFToolkitSolution/Src/WPFToolkit.Extended/SplitButton/SplitButton.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Windows.Controls.Primitives;

namespace Microsoft.Windows.Controls
{
    public class SplitButton : ContentControl
    {
        #region Members

        ToggleButton _dropDownButton;
        Popup _popup;

        #endregion //Members

        #region Constructors

        static SplitButton()
        {
            DefaultStyleKeyProperty.OverrideMetadata(typeof(SplitButton), new FrameworkPropertyMetadata(typeof(SplitButton)));
        }

        #endregion //Constructors

        #region Properties

        #region DropDownContent

        public static readonly DependencyProperty DropDownContentProperty = DependencyProperty.Register("DropDownContent", typeof(object), typeof(SplitButton), new UIPropertyMetadata(null, OnDropDownContentChanged));
        public object DropDownContent
        {
            get { return (object)GetValue(DropDownContentProperty); }
            set { SetValue(DropDownContentProperty, value); }
        }

        private static void OnDropDownContentChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
        {
            SplitButton splitButton = o as SplitButton;
            if (splitButton != null)
                splitButton.OnDropDownContentChanged((object)e.OldValue, (object)e.NewValue);
        }

        protected virtual void OnDropDownContentChanged(object oldValue, object newValue)
        {
            // TODO: Add your property changed side-effects. Descendants can override as well.
        }        

        #endregion //DropDownContent

        #region IsOpen

        public static readonly DependencyProperty IsOpenProperty = DependencyProperty.Register("IsOpen", typeof(bool), typeof(SplitButton), new UIPropertyMetadata(false, OnIsOpenChanged));
        public bool IsOpen
        {
            get { return (bool)GetValue(IsOpenProperty); }
            set { SetValue(IsOpenProperty, value); }
        }

        private static void OnIsOpenChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
        {
            SplitButton splitButton = o as SplitButton;
            if (splitButton != null)
                splitButton.OnIsOpenChanged((bool)e.OldValue, (bool)e.NewValue);
        }

        protected virtual void OnIsOpenChanged(bool oldValue, bool newValue)
        {
            // TODO: Add your property changed side-effects. Descendants can override as well.
        }

        #endregion //IsOpen

        #endregion //Properties

        #region Base Class Overrides

        public override void OnApplyTemplate()
        {
            base.OnApplyTemplate();

            _dropDownButton = (ToggleButton)GetTemplateChild("PART_ToggleButton");

            _popup = (Popup)GetTemplateChild("PART_Popup");
        }

        #endregion //Base Class Overrides
    }
}