SectionVisual.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / MS / Internal / PtsHost / SectionVisual.cs / 1 / SectionVisual.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// Copyright (C) Microsoft Corporation.  All rights reserved.
//
// File: SectionVisual.cs 
//
// Description: Visual representing a section. 
// 
// History:
//  05/20/2003 : [....] - created. 
//
//---------------------------------------------------------------------------
using System;
using System.Diagnostics; 
using System.Windows;
using System.Windows.Media; 
using System.Windows.Threading; 
using MS.Internal.Text;
 
using MS.Internal.PtsHost.UnsafeNativeMethods;

namespace MS.Internal.PtsHost
{ 
    // ---------------------------------------------------------------------
    // Visual representing a section. 
    // --------------------------------------------------------------------- 
    internal class SectionVisual : DrawingVisual
    { 
        // ------------------------------------------------------------------
        // Constructor.
        // -----------------------------------------------------------------
        internal SectionVisual() 
        {
        } 
 
        // ------------------------------------------------------------------
        // Set information about column rules that are necessary for rendering 
        // process. Draw column rules if necessary.
        //
        //      arrayColumnDesc - column description including rectangle coordinates, etc
        //      columnVStart - vertical start coordinate of column rule 
        //      columnHeight - height of column rule
        //      columnProperties - column properties. 
        // ------------------------------------------------------------------ 
        internal void DrawColumnRules(ref PTS.FSTRACKDESCRIPTION[] arrayColumnDesc, double columnVStart, double columnHeight, ColumnPropertiesGroup columnProperties)
        { 
            // Compute column rules data first.
            Point[] rulePositions = null;
            double ruleWidth = columnProperties.ColumnRuleWidth;
            if (arrayColumnDesc.Length > 1) 
            {
                if (ruleWidth > 0) 
                { 
                    int gapWidth = (arrayColumnDesc[1].fsrc.u - (arrayColumnDesc[0].fsrc.u + arrayColumnDesc[0].fsrc.du)) / 2;
                    rulePositions = new Point[(arrayColumnDesc.Length - 1)*2]; 
                    for (int index = 1; index < arrayColumnDesc.Length; index++)
                    {
                        double u = TextDpi.FromTextDpi(arrayColumnDesc[index].fsrc.u - gapWidth);
                        double v = columnVStart; 
                        double dv = columnHeight;
                        rulePositions[(index-1)*2].X = u; 
                        rulePositions[(index-1)*2].Y = v; 
                        rulePositions[(index-1)*2+1].X = u;
                        rulePositions[(index-1)*2+1].Y = v + dv; 
                    }
                }
            }
 
            // Check if update of the visual render data is needed.
            bool needsUpdate = _ruleWidth != ruleWidth; 
            if (!needsUpdate && _rulePositions != rulePositions) 
            {
                int prevSize = _rulePositions == null ? 0 : _rulePositions.Length; 
                int newSize = rulePositions == null ? 0 : rulePositions.Length;
                if (prevSize == newSize)
                {
                    for (int index = 0; index < rulePositions.Length; index++) 
                    {
                        if (!DoubleUtil.AreClose(rulePositions[index].X, _rulePositions[index].X) || 
                            !DoubleUtil.AreClose(rulePositions[index].Y, _rulePositions[index].Y)) 
                        {
                            needsUpdate = true; 
                            break;
                        }
                    }
                } 
                else
                { 
                    needsUpdate = true; 
                }
            } 

            // Draw column rules if necessary
            if (needsUpdate)
            { 
                _ruleWidth = ruleWidth;
                _rulePositions = rulePositions; 
 
                // Open DrawingContext and draw background.
                // If background is not set, Open will clear the render data, but it 
                // will preserve visual children.
                using (DrawingContext dc = RenderOpen())
                {
                    if (rulePositions != null) 
                    {
                        // We do not want to cause the user's Brush to become frozen when we 
                        // freeze pen below, therefore we make our own copy of the Brush if 
                        // it is not already frozen.
                        Brush columnRuleBrush = (Brush)FreezableOperations.GetAsFrozenIfPossible(columnProperties.ColumnRuleBrush); 

                        Pen pen = new Pen(columnRuleBrush, ruleWidth);

                        // Freeze the pen if possible.  Doing this avoids the overhead of 
                        // maintaining changed handlers.
                        if (pen.CanFreeze) { pen.Freeze(); } 
 
                        for (int index = 0; index < rulePositions.Length; index += 2)
                        { 
                            dc.DrawLine(pen, rulePositions[index], rulePositions[index + 1]);
                        }
                    }
                } 
            }
        } 
 
        // -----------------------------------------------------------------
        // Column rules positions 
        // ------------------------------------------------------------------
        private Point[] _rulePositions;

        // ----------------------------------------------------------------- 
        // Pen for column rule.
        // ----------------------------------------------------------------- 
        private double _ruleWidth; 
    }
} 

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

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