// Copyright (c) 2014 AlphaSierraPapa for the SharpDevelop Team
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

using System;
using System.Windows;
using System.Windows.Controls.Primitives;

namespace ICSharpCode.AvalonEdit.Search
{
	/// <summary>
	/// A button that opens a drop-down menu when clicked.
	/// </summary>
	public class DropDownButton : ButtonBase
	{
		/// <summary>
		/// Identifies the <see cref="DropDownContentProperty" /> dependency property.
		/// </summary>
		public static readonly DependencyProperty DropDownContentProperty
		= DependencyProperty.Register("DropDownContent", typeof(Popup),
			typeof(DropDownButton), new FrameworkPropertyMetadata(null));
		
		/// <summary>
		/// The key that identifies the <see cref="IsDropDownContentOpenProperty" /> dependency property.
		/// </summary>
		[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Security", "CA2104:DoNotDeclareReadOnlyMutableReferenceTypes")]
		protected static readonly DependencyPropertyKey IsDropDownContentOpenPropertyKey
		= DependencyProperty.RegisterReadOnly("IsDropDownContentOpen", typeof(bool),
			typeof(DropDownButton), new FrameworkPropertyMetadata(false));
		
		/// <summary>
		/// Identifies the <see cref="IsDropDownContentOpenProperty" /> dependency property.
		/// </summary>
		public static readonly DependencyProperty IsDropDownContentOpenProperty = IsDropDownContentOpenPropertyKey.DependencyProperty;
		
		static DropDownButton()
		{
			DefaultStyleKeyProperty.OverrideMetadata(typeof(DropDownButton), new FrameworkPropertyMetadata(typeof(DropDownButton)));
		}
		
		/// <summary>
		/// Gets/Sets the popup that is used as drop-down content.
		/// </summary>
		public Popup DropDownContent {
			get { return (Popup)GetValue(DropDownContentProperty); }
			set { SetValue(DropDownContentProperty, value); }
		}
		
		/// <summary>
		/// Gets whether the drop-down is opened.
		/// </summary>
		public bool IsDropDownContentOpen {
			get { return (bool)GetValue(IsDropDownContentOpenProperty); }
			protected set { SetValue(IsDropDownContentOpenPropertyKey, value); }
		}
		
		/// <inheritdoc/>
		protected override void OnClick()
		{
			if (DropDownContent != null && !IsDropDownContentOpen) {
				DropDownContent.Placement = PlacementMode.Bottom;
				DropDownContent.PlacementTarget = this;
				DropDownContent.IsOpen = true;
				DropDownContent.Closed += DropDownContent_Closed;
				this.IsDropDownContentOpen = true;
			}
		}
		
		void DropDownContent_Closed(object sender, EventArgs e)
		{
			((Popup)sender).Closed -= DropDownContent_Closed;
			this.IsDropDownContentOpen = false;
		}
	}
}