LayoutEngine.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / Layout / LayoutEngine.cs / 1 / 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; } 

        /// 
        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.
// Copyright (c) Microsoft Corporation. All rights reserved.

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