LayoutEngine.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / WinForms / Managed / System / WinForms / Layout / LayoutEngine.cs / 1305376 / LayoutEngine.cs
                        

                        
                            //#define LAYOUT_PERFWATCH 
//------------------------------------------------------------------------------
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
//  
//-----------------------------------------------------------------------------
 
namespace System.Windows.Forms.Layout { 
    using System;
    using System.Collections; 
    using System.Collections.Specialized;
    using System.ComponentModel;
    using System.Drawing;
    using System.Diagnostics; 
    using System.Diagnostics.CodeAnalysis;
    using System.Security.Permissions; 
 
    /// 
    public abstract class LayoutEngine { 
        internal IArrangedElement CastToArrangedElement(object obj) {
            IArrangedElement element = obj as IArrangedElement;
            if(obj == null) {
                throw new NotSupportedException(SR.GetString(SR.LayoutEngineUnsupportedType, obj.GetType())); 
            }
            return element; 
        } 

        internal virtual Size GetPreferredSize(IArrangedElement container, Size proposedConstraints) { return Size.Empty; } 

        /// 
        [System.Runtime.TargetedPatchingOptOutAttribute("Performance critical to inline across NGen image boundaries")]
        public virtual void InitLayout(object child, BoundsSpecified specified) { 
            InitLayoutCore(CastToArrangedElement(child), specified);
        } 
 
        internal virtual void InitLayoutCore(IArrangedElement element, BoundsSpecified bounds) {}
 
        internal virtual void ProcessSuspendedLayoutEventArgs(IArrangedElement container, LayoutEventArgs args) {}

#if LAYOUT_PERFWATCH
private static int LayoutWatch = 100; 
#endif
        ///  
        [SuppressMessage("Microsoft.Security", "CA2109:ReviewVisibleEventHandlers")] 
        public virtual bool Layout(object container, LayoutEventArgs layoutEventArgs) {
 
#if LAYOUT_PERFWATCH
            Debug.WriteLine(container.GetType().Name + "::Layout("
                   + (layoutEventArgs.AffectedControl != null ? layoutEventArgs.AffectedControl.Name : "null")
                   + ", " + layoutEventArgs.AffectedProperty + ")"); 
            Debug.Indent();
            Stopwatch sw = new Stopwatch(); 
            sw.Start(); 
#endif
            bool parentNeedsLayout = LayoutCore(CastToArrangedElement(container), layoutEventArgs); 

#if LAYOUT_PERFWATCH
            sw.Stop();
            if (sw.ElapsedMilliseconds > LayoutWatch && Debugger.IsAttached) { 
                Debugger.Break();
            } 
            Debug.Unindent(); 
            Debug.WriteLine(container.GetType().Name + "::Layout elapsed " + sw.ElapsedMilliseconds.ToString() + " returned: " + parentNeedsLayout);
#endif 
            return parentNeedsLayout;
        }

        internal virtual bool LayoutCore(IArrangedElement container, LayoutEventArgs layoutEventArgs) { return false; } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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