source: branches/2870_AutoDiff-nuget/HeuristicLab.ExtLibs/HeuristicLab.AvalonEdit/5.0.1/AvalonEdit-5.0.1/CodeCompletion/InsightWindow.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
// 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;
using ICSharpCode.AvalonEdit.Editing;
using ICSharpCode.AvalonEdit.Utils;

namespace ICSharpCode.AvalonEdit.CodeCompletion
{
  /// <summary>
  /// A popup-like window that is attached to a text segment.
  /// </summary>
  public class InsightWindow : CompletionWindowBase
  {
    static InsightWindow()
    {
      DefaultStyleKeyProperty.OverrideMetadata(typeof(InsightWindow),
                                               new FrameworkPropertyMetadata(typeof(InsightWindow)));
      AllowsTransparencyProperty.OverrideMetadata(typeof(InsightWindow),
                                                  new FrameworkPropertyMetadata(Boxes.True));
    }
    
    /// <summary>
    /// Creates a new InsightWindow.
    /// </summary>
    public InsightWindow(TextArea textArea) : base(textArea)
    {
      this.CloseAutomatically = true;
      AttachEvents();
    }
    
    /// <inheritdoc/>
    protected override void OnSourceInitialized(EventArgs e)
    {
      Rect caret = this.TextArea.Caret.CalculateCaretRectangle();
      Point pointOnScreen = this.TextArea.TextView.PointToScreen(caret.Location - this.TextArea.TextView.ScrollOffset);
      Rect workingArea = System.Windows.Forms.Screen.FromPoint(pointOnScreen.ToSystemDrawing()).WorkingArea.ToWpf().TransformFromDevice(this);
      
      MaxHeight = workingArea.Height;
      MaxWidth = Math.Min(workingArea.Width, Math.Max(1000, workingArea.Width * 0.6));
      
      base.OnSourceInitialized(e);
    }
    
    /// <summary>
    /// Gets/Sets whether the insight window should close automatically.
    /// The default value is true.
    /// </summary>
    public bool CloseAutomatically { get; set; }
    
    /// <inheritdoc/>
    protected override bool CloseOnFocusLost {
      get { return this.CloseAutomatically; }
    }
    
    void AttachEvents()
    {
      this.TextArea.Caret.PositionChanged += CaretPositionChanged;
    }
    
    /// <inheritdoc/>
    protected override void DetachEvents()
    {
      this.TextArea.Caret.PositionChanged -= CaretPositionChanged;
      base.DetachEvents();
    }
    
    void CaretPositionChanged(object sender, EventArgs e)
    {
      if (this.CloseAutomatically) {
        int offset = this.TextArea.Caret.Offset;
        if (offset < this.StartOffset || offset > this.EndOffset) {
          Close();
        }
      }
    }
  }
  
  /// <summary>
  /// TemplateSelector for InsightWindow to replace plain string content by a TextBlock with TextWrapping.
  /// </summary>
  internal sealed class InsightWindowTemplateSelector : DataTemplateSelector
  {
    public override DataTemplate SelectTemplate(object item, DependencyObject container)
    {
      if (item is string)
        return (DataTemplate)((FrameworkElement)container).FindResource("TextBlockTemplate");
      
      return null;
    }
  }
}