|
//---------------------------------------------------------------------------
//
// <copyright file=ColumnResizeAdorner.cs company=Microsoft>
// Copyright (C) Microsoft Corporation. All rights reserved.
// </copyright>
//
//
// Description: Adorner for column resize.
//
// History:
// 08/19/2004 : ghermann - Created
//
//---------------------------------------------------------------------------
using System;
using System.Diagnostics;
using System.Windows.Documents;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using MS.Win32;
using MS.Internal;
namespace System.Windows.Documents.Internal
{
internal class ColumnResizeAdorner : Adorner
{
//------------------------------------------------------
//
// Constructors
//
//------------------------------------------------------
#region Constructors
/// <summary>
/// C'tor for adorner
/// </summary>
/// <param name="scope">
/// FramwerokElement with TextView to which this element is attached
/// as adorner.
/// </param>
internal ColumnResizeAdorner(UIElement scope) : base(scope)
{
Debug.Assert(scope != null);
// position
_pen = new Pen(new SolidColorBrush(Colors.LightSlateGray), 2.0);
_x = Double.NaN;
_top = Double.NaN;
_height = Double.NaN;
}
#endregion Constructors
//------------------------------------------------------
//
// Public Methods
//
//------------------------------------------------------
#region Public Methods
/// <summary>
/// Add a transform so that the adorner is in right spot.
/// </summary>
/// <param name="transform">
/// The transform applied to the object the adorner adorns
/// </param>
/// <returns>
/// Transform to apply to the adorner
/// </returns>
public override GeneralTransform GetDesiredTransform(GeneralTransform transform)
{
GeneralTransformGroup group;
TranslateTransform translation;
group = new GeneralTransformGroup();
translation = new TranslateTransform(_x, _top);
group.Children.Add(translation);
if (transform != null)
{
group.Children.Add(transform);
}
return group;
}
#endregion Public Methods
//------------------------------------------------------
//
// Protected Methods
//
//------------------------------------------------------
#region Protected Methods
protected override void OnRender(DrawingContext drawingContext)
{
// Render as a 2 pixel wide rect, one pixel in each bordering char bounding box.
drawingContext.DrawLine(_pen, new Point(0, 0),
new Point(0, _height));
}
#endregion Protected Events
//------------------------------------------------------
//
// Internal Methods
//
//------------------------------------------------------
#region Internal Methods
/// <summary>
/// Updates position for adorner.
/// </summary>
/// <param name="newX">
/// </param>
internal void Update(double newX)
{
if(_x != newX)
{
_x = newX;
AdornerLayer adornerLayer;
adornerLayer = VisualTreeHelper.GetParent(this) as AdornerLayer;
if (adornerLayer != null)
{
// It may be null when TextBox is detached from a tree
adornerLayer.Update(AdornedElement);
adornerLayer.InvalidateVisual();
}
}
}
internal void Initialize(UIElement renderScope, double xPos, double yPos, double height)
{
Debug.Assert(_adornerLayer == null, "Attempt to overwrite existing AdornerLayer!");
_adornerLayer = AdornerLayer.GetAdornerLayer(renderScope);
if (_adornerLayer != null)
{
_adornerLayer.Add(this);
}
_x = xPos;
_top = yPos;
_height = height;
}
internal void Uninitialize()
{
if (_adornerLayer != null)
{
_adornerLayer.Remove(this);
_adornerLayer = null;
}
}
#endregion Internal methods
//------------------------------------------------------
//
// Private Methods
//
//------------------------------------------------------
#region Private Methods
#endregion Private methods
//------------------------------------------------------
//
// Private Fields
//
//------------------------------------------------------
#region Private Fields
// x position
private double _x;
// top position
private double _top;
// height
private double _height;
private Pen _pen;
// Cached adornerlayer
private AdornerLayer _adornerLayer;
#endregion Private Fields
}
}
|