ComponentEditorPage.cs source code in C# .NET

                        Code:
                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / Design / ComponentEditorPage.cs / 1 / ComponentEditorPage.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

/* 
 */ 

namespace System.Windows.Forms.Design { 
    using System.Runtime.Remoting;
    using System.ComponentModel;

    using System.Diagnostics; 

    using System; 
    using System.Security.Permissions; 
    using System.Drawing;
    using System.Windows.Forms; 
    using System.Windows.Forms.ComponentModel;
    using System.ComponentModel.Design;
    using Microsoft.Win32;
    using System.Runtime.InteropServices; 

    ///  
    ///  
    /// Provides a base implementation for a .
    ///  
    [ComVisible(true),
     ClassInterface(ClassInterfaceType.AutoDispatch),
     System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1012:AbstractTypesShouldNotHaveConstructors") // Shipped in Everett
    ] 
    [System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.InheritanceDemand, Name="FullTrust")]
    public abstract class ComponentEditorPage : Panel { 
 
        IComponentEditorPageSite pageSite;
        IComponent component; 
        bool firstActivate;
        bool loadRequired;
        int loading;
        Icon icon; 
        bool commitOnDeactivate;
 
        ///  
        /// 
        ///     
        ///       Initializes a new instance of the  class.
        ///    
        /// 
        public ComponentEditorPage() : base() { 
            commitOnDeactivate = false;
            firstActivate = true; 
            loadRequired = false; 
            loading = 0;
 
            Visible = false;
        }

 
        /// 
        ///  
        ///     
        ///       Hide the property
        ///     
        /// 
        [Browsable(false), EditorBrowsable(EditorBrowsableState.Never), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
        public override bool AutoSize
        { 
            get
            { 
                return base.AutoSize; 
            }
            set 
            {
                base.AutoSize = value;
            }
        } 

        ///  
        [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)] 
        new public event EventHandler AutoSizeChanged
        { 
            add
            {
                base.AutoSizeChanged += value;
            } 
            remove
            { 
                base.AutoSizeChanged -= value; 
            }
        } 

        /// 
        /// 
        ///    Gets or sets the page site. 
        /// 
        protected IComponentEditorPageSite PageSite { 
            get { return pageSite; } 
            set { pageSite = value; }
        } 
        /// 
        /// 
        ///    Gets or sets the component to edit.
        ///  
        protected IComponent Component {
            get { return component; } 
            set { component = value; } 
        }
        ///  
        /// 
        ///    Indicates whether the page is being activated for the first time.
        /// 
        protected bool FirstActivate { 
            get { return firstActivate; }
            set { firstActivate = value; } 
        } 
        /// 
        ///  
        ///    Indicates whether a load is required previous to editing.
        /// 
        protected bool LoadRequired {
            get { return loadRequired; } 
            set { loadRequired = value; }
        } 
        ///  
        /// 
        ///    Indicates if loading is taking place. 
        /// 
        protected int Loading {
            get { return loading; }
            set { loading = value; } 
        }
 
        ///  
        /// 
        ///     Indicates whether an editor should apply its 
        ///       changes before it is deactivated.
        /// 
        public bool CommitOnDeactivate {
            get { 
                return commitOnDeactivate;
            } 
            set { 
                commitOnDeactivate = value;
            } 
        }

        /// 
        ///  
        ///    Gets or sets the creation parameters for this control.
        ///  
        protected override CreateParams CreateParams { 
            [SecurityPermission(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.UnmanagedCode)]
            get { 
                CreateParams cp = base.CreateParams;
                cp.Style &= ~(NativeMethods.WS_BORDER | NativeMethods.WS_OVERLAPPED | NativeMethods.WS_DLGFRAME);
                return cp;
            } 
        }
 
        ///  
        /// 
        ///    Gets or sets the icon for this page. 
        /// 
        public Icon Icon {
            get {
                if (icon == null) { 
                    icon = new Icon(typeof(ComponentEditorPage), "ComponentEditorPage.ico");
                } 
                return icon; 
            }
            set { 
                icon = value;
            }
        }
 
        /// 
        ///  
        ///     
        ///       Gets or sets the title of the page.
        ///  
        public virtual string Title {
            get {
                return base.Text;
            } 
        }
 
        ///  
        /// 
        ///     Activates and displays the page. 
        /// 
        public virtual void Activate() {
            if (loadRequired) {
                EnterLoadingMode(); 
                LoadComponent();
                ExitLoadingMode(); 
 
                loadRequired = false;
            } 
            Visible = true;
            firstActivate = false;
        }
 
        /// 
        ///  
        ///    Applies changes to all the components being edited. 
        /// 
        public virtual void ApplyChanges() { 
            SaveComponent();
        }

        ///  
        /// 
        ///    Deactivates and hides the page. 
        ///  
        public virtual void Deactivate() {
            Visible = false; 
        }

        /// 
        ///  
        ///    Increments the loading counter, which determines whether a page
        ///    is in loading mode. 
        ///  
        protected void EnterLoadingMode() {
            loading++; 
        }

        /// 
        ///  
        ///    Decrements the loading counter, which determines whether a page
        ///    is in loading mode. 
        ///  
        protected void ExitLoadingMode() {
            Debug.Assert(loading > 0, "Unbalanced Enter/ExitLoadingMode calls"); 
            loading--;
        }

        ///  
        /// 
        ///    Gets the control that represents the window for this page. 
        ///  
        public virtual Control GetControl() {
            return this; 
        }

        /// 
        ///  
        ///    Gets the component that is to be edited.
        ///  
        protected IComponent GetSelectedComponent() { 
            return component;
        } 

        /// 
        /// 
        ///    Processes messages that could be handled by the page. 
        /// 
        public virtual bool IsPageMessage(ref Message msg) { 
            return PreProcessMessage(ref msg); 
        }
 
        /// 
        /// 
        ///    Gets a value indicating whether the page is being activated for the first time.
        ///  
        protected bool IsFirstActivate() {
            return firstActivate; 
        } 

        ///  
        /// 
        ///    Gets a value indicating whether the page is being loaded.
        /// 
        protected bool IsLoading() { 
            return loading != 0;
        } 
 
        /// 
        ///  
        ///    Loads the component into the page UI.
        /// 
        protected abstract void LoadComponent();
 
        /// 
        ///  
        ///     
        ///       Called when the page along with its sibling
        ///       pages have applied their changes. 
        /// 
        public virtual void OnApplyComplete() {
            ReloadComponent();
        } 

        ///  
        ///  
        ///    Called when the current component may have changed elsewhere
        ///       and needs to be reloded into the UI. 
        /// 
        protected virtual void ReloadComponent() {
            if (Visible == false) {
                loadRequired = true; 
            }
        } 
 
        /// 
        ///  
        ///    Saves the component from the page UI.
        /// 
        protected abstract void SaveComponent();
 
        /// 
        ///  
        ///    Sets the page to be in dirty state. 
        /// 
        protected virtual void SetDirty() { 
            if (IsLoading() == false) {
                pageSite.SetDirty();
            }
        } 

        ///  
        ///  
        ///    Sets the component to be edited.
        ///  
        public virtual void SetComponent(IComponent component) {
            this.component = component;
            loadRequired = true;
        } 

        ///  
        ///  
        ///     Sets the site for this page.
        ///  
        public virtual void SetSite(IComponentEditorPageSite site) {
            this.pageSite = site;

            pageSite.GetControl().Controls.Add(this); 
        }
 
        ///  
        /// 
        ///     
        ///       Provides help information to the help system.
        /// 
        public virtual void ShowHelp() {
        } 

        ///  
        ///  
        ///    Gets a value indicating whether the editor supports Help.
        ///  
        public virtual bool SupportsHelp() {
            return false;
        }
    } 
}

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

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