Panel.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / Panel.cs / 1 / Panel.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

/* 
 */ 
namespace System.Windows.Forms {
    using System.Runtime.Serialization.Formatters; 
    using System.Runtime.InteropServices;

    using System.Diagnostics;
 
    using System;
    using System.Security.Permissions; 
    using System.ComponentModel; 
    using System.Drawing;
    using Microsoft.Win32; 
    using System.Windows.Forms.Layout;

    /// 
    ///  
    ///    
    ///       Represents a  
    ///       control. 
    /// 
    [ 
    ComVisible(true),
    ClassInterface(ClassInterfaceType.AutoDispatch),
    DefaultProperty("BorderStyle"),
    DefaultEvent("Paint"), 
    Docking(DockingBehavior.Ask),
    Designer("System.Windows.Forms.Design.PanelDesigner, " + AssemblyRef.SystemDesign), 
    SRDescription(SR.DescriptionPanel) 
    ]
    public class Panel : ScrollableControl { 

        private BorderStyle borderStyle = System.Windows.Forms.BorderStyle.None;

        ///  
        /// 
        /// Initializes a new instance of the  class. 
        ///  
        public Panel()
        : base() { 
            // this class overrides GetPreferredSizeCore, let Control automatically cache the result
            SetState2(STATE2_USEPREFERREDSIZECACHE, true);
            TabStop = false;
            SetStyle(ControlStyles.Selectable | 
                     ControlStyles.AllPaintingInWmPaint, false);
            SetStyle(ControlStyles.SupportsTransparentBackColor, true); 
        } 

        ///  
        /// 
        ///     Override to re-expose AutoSize.
        /// 
        [Browsable(true), EditorBrowsable(EditorBrowsableState.Always), 
        DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
        public override bool AutoSize 
        { 
            get
            { 
                return base.AutoSize;
            }
            set
            { 
                base.AutoSize = value;
            } 
        } 

        ///  
        [SRCategory(SR.CatPropertyChanged), SRDescription(SR.ControlOnAutoSizeChangedDescr)]
        [Browsable(true), EditorBrowsable(EditorBrowsableState.Always)]
        new public event EventHandler AutoSizeChanged
        { 
            add
            { 
                base.AutoSizeChanged += value; 
            }
            remove 
            {
                base.AutoSizeChanged -= value;
            }
        } 

        ///  
        ///     Allows the control to optionally shrink when AutoSize is true. 
        /// 
        [ 
        SRDescription(SR.ControlAutoSizeModeDescr),
        SRCategory(SR.CatLayout),
        Browsable(true),
        DefaultValue(AutoSizeMode.GrowOnly), 
        Localizable(true)
        ] 
        public virtual AutoSizeMode AutoSizeMode { 
            get {
                return GetAutoSizeMode(); 
            }
            set {
                if (!ClientUtils.IsEnumValid(value, (int)value, (int)AutoSizeMode.GrowAndShrink, (int)AutoSizeMode.GrowOnly)){
                    throw new InvalidEnumArgumentException("value", (int)value, typeof(AutoSizeMode)); 
                }
                if (GetAutoSizeMode() != value) { 
                    SetAutoSizeMode(value); 
                    if(ParentInternal != null) {
                        // DefaultLayout does not keep anchor information until it needs to.  When 
                        // AutoSize became a common property, we could no longer blindly call into
                        // DefaultLayout, so now we do a special InitLayout just for DefaultLayout.
                        if(ParentInternal.LayoutEngine == DefaultLayout.Instance) {
                            ParentInternal.LayoutEngine.InitLayout(this, BoundsSpecified.Size); 
                        }
                        LayoutTransaction.DoLayout(ParentInternal, this, PropertyNames.AutoSize); 
                    } 
                }
            } 
        }

        /// 
        ///  
        ///     Indicates the
        ///       border style for the control. 
        ///  
        [
        SRCategory(SR.CatAppearance), 
        DefaultValue(BorderStyle.None),
        DispId(NativeMethods.ActiveX.DISPID_BORDERSTYLE),
        SRDescription(SR.PanelBorderStyleDescr)
        ] 
        public BorderStyle BorderStyle {
            get { 
                return borderStyle; 
            }
 
            set {
                if (borderStyle != value) {
                    //valid values are 0x0 to 0x2
                    if (!ClientUtils.IsEnumValid(value, (int)value, (int)BorderStyle.None, (int)BorderStyle.Fixed3D)) 
                    {
                        throw new InvalidEnumArgumentException("value", (int)value, typeof(BorderStyle)); 
                    } 

                    borderStyle = value; 
                    UpdateStyles();
                }
            }
        } 

        ///  
        ///  
        /// 
        ///    Returns the parameters needed to create the handle.  Inheriting classes 
        ///    can override this to provide extra functionality.  They should not,
        ///    however, forget to call base.getCreateParams() first to get the struct
        ///    filled up with the basic info.
        ///  
        protected override CreateParams CreateParams {
            [SecurityPermission(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.UnmanagedCode)] 
            get { 
                CreateParams cp = base.CreateParams;
                cp.ExStyle |= NativeMethods.WS_EX_CONTROLPARENT; 

                cp.ExStyle &= (~NativeMethods.WS_EX_CLIENTEDGE);
                cp.Style &= (~NativeMethods.WS_BORDER);
 
                switch (borderStyle) {
                    case BorderStyle.Fixed3D: 
                        cp.ExStyle |= NativeMethods.WS_EX_CLIENTEDGE; 
                        break;
                    case BorderStyle.FixedSingle: 
                        cp.Style |= NativeMethods.WS_BORDER;
                        break;
                }
                return cp; 
            }
        } 
 
        /// 
        ///  
        ///     Deriving classes can override this to configure a default size for their control.
        ///     This is more efficient than setting the size in the control's constructor.
        /// 
        protected override Size DefaultSize { 
            get {
                return new Size(200, 100); 
            } 
        }
 
        internal override Size GetPreferredSizeCore(Size proposedSize) {
            // Translating 0,0 from ClientSize to actual Size tells us how much space
            // is required for the borders.
            Size borderSize = SizeFromClientSize(Size.Empty); 
            Size totalPadding = borderSize + Padding.Size;
 
            return LayoutEngine.GetPreferredSize(this, proposedSize - totalPadding) + totalPadding; 
        }
 
        /// 
        /// 
        [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]
        public new event KeyEventHandler KeyUp { 
            add {
                base.KeyUp += value; 
            } 
            remove {
                base.KeyUp -= value; 
            }
        }

        ///  
        /// 
        [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)] 
        public new event KeyEventHandler KeyDown { 
            add {
                base.KeyDown += value; 
            }
            remove {
                base.KeyDown -= value;
            } 
        }
 
        ///  
        /// 
        [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)] 
        public new event KeyPressEventHandler KeyPress {
            add {
                base.KeyPress += value;
            } 
            remove {
                base.KeyPress -= value; 
            } 
        }
 
        /// 
        /// 
        /// 
        [DefaultValue(false)] 
        new public bool TabStop {
            get { 
                return base.TabStop; 
            }
            set { 
                base.TabStop = value;
            }
        }
 
        /// 
        ///  
        ///  
        /// 
        [Browsable(false), EditorBrowsable(EditorBrowsableState.Never), Bindable(false)] 
        public override string Text {
            get {
                return base.Text;
            } 
            set {
                base.Text = value; 
            } 
        }
 
        /// 
        /// 
        [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]
        new public event EventHandler TextChanged { 
            add {
                base.TextChanged += value; 
            } 
            remove {
                base.TextChanged -= value; 
            }
        }

        ///  
        /// 
        ///  
        ///    Fires the event indicating that the panel has been resized. 
        ///       Inheriting controls should use this in favour of actually listening to
        ///       the event, but should not forget to call base.onResize() to 
        ///       ensure that the event is still fired for external listeners.
        /// 
        protected override void OnResize(EventArgs eventargs) {
            if (DesignMode && borderStyle == BorderStyle.None) { 
                Invalidate();
            } 
            base.OnResize(eventargs); 
        }
 

        internal override void PrintToMetaFileRecursive(HandleRef hDC, IntPtr lParam, Rectangle bounds) {
            base.PrintToMetaFileRecursive(hDC, lParam, bounds);
 
            using (WindowsFormsUtils.DCMapping mapping = new WindowsFormsUtils.DCMapping(hDC, bounds)) {
                using(Graphics g = Graphics.FromHdcInternal(hDC.Handle)) { 
                    ControlPaint.PrintBorder(g, new Rectangle(Point.Empty, Size), BorderStyle, Border3DStyle.Sunken); 
                }
            } 
        }

        /// 
        ///  
        /// 
        ///  
        private static string StringFromBorderStyle(BorderStyle value) { 
            Type borderStyleType = typeof(BorderStyle);
            return (ClientUtils.IsEnumValid(value, (int)value, (int)BorderStyle.None, (int)BorderStyle.Fixed3D)) ? (borderStyleType.ToString() + "." + value.ToString()) : "[Invalid BorderStyle]"; 
        }

        /// 
        ///  
        ///     Returns a string representation for this control.
        ///  
        ///  
        public override string ToString() {
 
            string s = base.ToString();
            return s + ", BorderStyle: " + StringFromBorderStyle(borderStyle);
        }
 
    }
} 

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