ColumnResizeAdorner.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Documents / ColumnResizeAdorner.cs / 1 / ColumnResizeAdorner.cs
                        

                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// 
// Description: Adorner for column resize. 
//
// History: 
//  08/19/2004 : [....] - 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 

        ///  
        /// C'tor for adorner
        /// 
        /// 
        /// FramwerokElement with TextView to which this element is attached 
        /// as adorner.
        ///  
        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 

        /// 
        /// Add a transform so that the adorner is in right spot.
        ///  
        /// 
        /// The transform applied to the object the adorner adorns 
        ///  
        /// 
        /// Transform to apply to the adorner 
        /// 
        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

        ///  
        /// Updates position for adorner.
        ///  
        ///  
        /// 
        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 
    }
} 
 


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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