InkCanvasFeedbackAdorner.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / MS / Internal / Controls / InkCanvasFeedbackAdorner.cs / 1305600 / InkCanvasFeedbackAdorner.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// File: InkCanvasFeedbackAdorner.cs
//
// Description: 
//      A class which is used as the feedback adorner of the InkCanvas selection
// 
// Features: 
//
// History: 
//  1/27/2005 waynezen:       Created
//
// Copyright (C) 2001 by Microsoft Corporation.  All rights reserved.
// 
//---------------------------------------------------------------------------
 
using MS.Internal; 
using System;
using System.Diagnostics; 
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Media; 

namespace MS.Internal.Controls 
{ 
    /// 
    /// InkCanvasFeedbackAdorner 
    /// 
    internal class InkCanvasFeedbackAdorner : Adorner
    {
        // No default constructor 
        private InkCanvasFeedbackAdorner() : base (null) { }
 
        ///  
        /// InkCanvasFeedbackAdorner Constructor
        ///  
        /// The adorned InkCanvas
        internal InkCanvasFeedbackAdorner(InkCanvas inkCanvas)
            : base(( inkCanvas != null ? inkCanvas.InnerCanvas : null ))
        { 
            if ( inkCanvas == null )
                throw new ArgumentNullException("inkCanvas"); 
 
            // Initialize the internal data
            _inkCanvas = inkCanvas; 

            _adornerBorderPen = new Pen(Brushes.Black, 1.0);
            DoubleCollection dashes = new DoubleCollection( );
            dashes.Add(4.5); 
            dashes.Add(4.5);
            _adornerBorderPen.DashStyle = new DashStyle(dashes, 2.25); 
            _adornerBorderPen.DashCap = PenLineCap.Flat; 

        } 

        /// 
        /// The overridden GetDesiredTransform method
        ///  
        public override GeneralTransform GetDesiredTransform(GeneralTransform transform)
        { 
            if ( transform == null ) 
            {
                throw new ArgumentNullException("transform"); 
            }

            VerifyAccess();
            GeneralTransformGroup desiredTransform = new GeneralTransformGroup(); 
            desiredTransform.Children.Add(transform);
 
            // Check if we need translate the adorner. 
            if ( !DoubleUtil.AreClose(_offsetX, 0) || !DoubleUtil.AreClose(_offsetY, 0) )
            { 
                desiredTransform.Children.Add(new TranslateTransform(_offsetX, _offsetY));
            }

            return desiredTransform; 
        }
 
        ///  
        /// The OnBoundsUpdated method
        ///  
        /// 
        private void OnBoundsUpdated(Rect rect)
        {
            VerifyAccess(); 

            // Check if the rectangle has been changed. 
            if ( rect != _previousRect ) 
            {
                Size newSize; 
                double offsetX;
                double offsetY;
                bool invalidArrange = false;
 
                if ( !rect.IsEmpty )
                { 
                    double offset = BorderMargin + CornerResizeHandleSize / 2; 
                    Rect adornerRect = Rect.Inflate(rect, offset, offset);
 
                    newSize = new Size(adornerRect.Width, adornerRect.Height);
                    offsetX = adornerRect.Left;
                    offsetY = adornerRect.Top;
                } 
                else
                { 
                    newSize = new Size(0, 0); 
                    offsetX = 0;
                    offsetY = 0; 
                }

                // Check if the size has been changed
                if ( _frameSize != newSize ) 
                {
                    _frameSize = newSize; 
                    invalidArrange = true; 
                }
 
                if ( !DoubleUtil.AreClose(_offsetX, offsetX) || !DoubleUtil.AreClose(_offsetY, offsetY) )
                {
                    _offsetX = offsetX;
                    _offsetY = offsetY; 
                    invalidArrange = true;
                } 
 
                if ( invalidArrange )
                { 
                    InvalidateMeasure();
                    InvalidateVisual(); //ensure re-rendering
                    UIElement parent = ((UIElement)VisualTreeHelper.GetParent(this)) as UIElement;
 
                    if ( parent != null )
                    { 
                        ( (UIElement)VisualTreeHelper.GetParent(this) ).InvalidateArrange( ); 
                    }
                } 

                _previousRect = rect;
            }
        } 

        ///  
        /// The overridden MeasureOverride method 
        /// 
        ///  
        protected override Size MeasureOverride(Size constraint)
        {
            VerifyAccess();
 
            // return the frame size.
            return _frameSize; 
        } 

        ///  
        /// The overridden OnRender method
        /// 
        /// 
        protected override void OnRender(DrawingContext drawingContext) 
        {
            // No need to invoke VerifyAccess since this method calls DrawingContext.DrawRectangle. 
 
            Debug.Assert(_frameSize != new Size(0, 0));
            // Draw the wire frame. 
            drawingContext.DrawRectangle(null, _adornerBorderPen,
                new Rect(CornerResizeHandleSize / 2, CornerResizeHandleSize / 2,
                    _frameSize.Width - CornerResizeHandleSize, _frameSize.Height - CornerResizeHandleSize));
        } 

        ///  
        /// The method is called by InkCanvasSelection.UpdateFeedbackRect 
        /// 
        ///  
        internal void UpdateBounds(Rect rect)
        {
            // Invoke OnBoundsUpdated.
            OnBoundsUpdated(rect); 
        }
 
        private InkCanvas   _inkCanvas; 
        private Size        _frameSize = new Size(0, 0);
        private Rect        _previousRect = Rect.Empty; 
        private double      _offsetX = 0;
        private double      _offsetY = 0;

        private Pen         _adornerBorderPen; 

        private const int       CornerResizeHandleSize = 8; 
        private const double    BorderMargin = 8f; 

    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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InkCanvasFeedbackAdorner.cs source code in C# .NET

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