source: branches/2925_AutoDiffForDynamicalModels/HeuristicLab.ExtLibs/HeuristicLab.AvalonEdit/5.0.1/AvalonEdit-5.0.1/Search/DropDownButton.cs

// 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
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// 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;
    }
  }
}