MultiView.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 / xsp / System / Web / UI / WebControls / MultiView.cs / 1305376 / MultiView.cs

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

namespace System.Web.UI.WebControls { 
 
    using System;
    using System.ComponentModel; 
    using System.Globalization;
    using System.Web.UI;

 
    /// 
    ///  
    ///  
    [
    ControlBuilder(typeof(MultiViewControlBuilder)), 
    Designer("System.Web.UI.Design.WebControls.MultiViewDesigner, " + AssemblyRef.SystemDesign),
    DefaultEvent("ActiveViewChanged"),
    ParseChildren(typeof(View))
    ] 
    [ToolboxData("<{0}:MultiView runat=\"server\">")]
    public class MultiView : Control { 
 
        private static readonly object _eventActiveViewChanged = new object();
        private int _activeViewIndex = -1; 
        private int _cachedActiveViewIndex = -1;
        private bool _ignoreBubbleEvents = false;
        private bool _controlStateApplied;
 

        ///  
        ///  Specifies the NextView command. This field is constant. 
        /// 
        public static readonly string NextViewCommandName = "NextView"; 

        /// 
        ///  Specifies the PrevView command. This field is constant.
        ///  
        public static readonly string PreviousViewCommandName = "PrevView";
 
        ///  
        ///  Specifies the SwitchViewById command. This field is constant.
        ///  
        public static readonly string SwitchViewByIDCommandName = "SwitchViewByID";

        /// 
        ///  Specifies the SwitchViewByIndex command. This field is constant. 
        /// 
        public static readonly string SwitchViewByIndexCommandName = "SwitchViewByIndex"; 
 

        ///  
        /// Indicates the active  inside the  control.
        /// 
        [
        DefaultValue(-1), 
        WebCategory("Behavior"),
        WebSysDescription(SR.MultiView_ActiveView) 
        ] 
        public virtual int ActiveViewIndex {
            get { 
                if (_cachedActiveViewIndex > -1) {
                    return _cachedActiveViewIndex;
                }
                return _activeViewIndex; 
            }
            set { 
                if (value < -1) { 
                    throw new ArgumentOutOfRangeException("value",
                        SR.GetString(SR.MultiView_ActiveViewIndex_less_than_minus_one, value)); 
                }
                if (Views.Count == 0 && ControlState < ControlState.FrameworkInitialized /* Whidbey 113333 */) {
                    _cachedActiveViewIndex = value;
                    return; 
                }
                if (value >= Views.Count) { 
                    throw new ArgumentOutOfRangeException("value", 
                        SR.GetString(SR.MultiView_ActiveViewIndex_equal_or_greater_than_count, value, Views.Count));
                } 

                // VSWhidbey 472054: If the cached index is not -1, that means we
                // haven't activate any view, hence original index is set to -1.
                int originalIndex = (_cachedActiveViewIndex != -1) ? -1 : _activeViewIndex; 
                _activeViewIndex = value;
                _cachedActiveViewIndex = -1; 
                // Need to compare originalIndex to Views.Count in case originalIndex was set declaratively. 
                if (originalIndex != value && originalIndex != -1  && originalIndex < Views.Count) {
                    Views[originalIndex].Active = false; 
                    if (ShouldTriggerViewEvent) {
                        Views[originalIndex].OnDeactivate(EventArgs.Empty);
                    }
                } 
                if (originalIndex != value && Views.Count != 0 && value != -1) {
                    Views[value].Active = true; 
                    if (ShouldTriggerViewEvent) { 
                        Views[value].OnActivate(EventArgs.Empty);
                        OnActiveViewChanged(EventArgs.Empty); 
                    }
                }
            }
        } 

        ///  
        ///    Gets and sets a value indicating whether theme is enabled. 
        /// 
        [ 
        Browsable(true)
        ]
        public override bool EnableTheming {
            get { 
                return base.EnableTheming;
            } 
            set { 
                base.EnableTheming = value;
            } 
        }

        private bool ShouldTriggerViewEvent {
            get { 
                // We want to fire the View's event on the first request
                return (_controlStateApplied || (Page != null && !Page.IsPostBack)); 
            } 
        }
 
        /// 
        /// [To be supplied.]
        /// 
        [ 
        Browsable(false),
        WebSysDescription(SR.MultiView_Views), 
        PersistenceMode(PersistenceMode.InnerDefaultProperty) 
        ]
        public virtual ViewCollection Views { 
            get {
                return (ViewCollection)Controls;
            }
        } 

 
 
        /// 
        ///    Occurs when the active view changed. 
        /// 
        [
        WebCategory("Action"),
        WebSysDescription(SR.MultiView_ActiveViewChanged) 
        ]
        public event EventHandler ActiveViewChanged { 
            add { 
                Events.AddHandler(_eventActiveViewChanged, value);
            } 
            remove {
                Events.RemoveHandler(_eventActiveViewChanged, value);
            }
        } 

 
        ///  
        /// 
        ///    Overridden to only allow View controls to be added. 
        /// 
        protected override void AddParsedSubObject(object obj) {
            if (obj is View) {
                Controls.Add((Control)obj); 
            }
            else if (!(obj is LiteralControl)) 
                throw new HttpException(SR.GetString(SR.MultiView_cannot_have_children_of_type, obj.GetType().Name)); 
        }
 

        /// 
        /// [To be supplied.]
        ///  
        protected override ControlCollection CreateControlCollection() {
            return new ViewCollection(this); 
        } 

 
        /// 
        /// [To be supplied.]
        /// 
        public View GetActiveView() { 
            int activeViewIndex = ActiveViewIndex;
            if (activeViewIndex >= Views.Count) { 
                throw new Exception(SR.GetString(SR.MultiView_ActiveViewIndex_out_of_range)); 
            }
            if (activeViewIndex < 0) { 
                return null;
            }
            View view = Views[activeViewIndex];
            if (!view.Active) { 
                UpdateActiveView(activeViewIndex);
            } 
            return view; 
        }
 
        // Used to wizard to disable bubble events on MultiView.
        internal void IgnoreBubbleEvents() {
            _ignoreBubbleEvents = true;
        } 

        private void UpdateActiveView(int activeViewIndex) { 
            for (int i=0; i
        /// Loads the control state.
        /// 
        protected internal override void LoadControlState(object state) { 
            Pair p = state as Pair;
            if (p != null) { 
                base.LoadControlState(p.First); 
                ActiveViewIndex = (int) p.Second;
            } 

            _controlStateApplied = true;
        }
 

        ///  
        /// Raises the event. 
        /// 
        protected virtual void OnActiveViewChanged(EventArgs e) { 
            EventHandler handler = (EventHandler)Events[_eventActiveViewChanged];
            if (handler != null) {
                handler(this, e);
            } 
        }
 
 
        /// 
        ///  
        ///    Overridden to handle navigation between child views.
        /// 
        protected override bool OnBubbleEvent(object source, EventArgs e) {
            if (_ignoreBubbleEvents) { 
                return false;
            } 
 
            if (e is CommandEventArgs) {
                CommandEventArgs ce = (CommandEventArgs) e; 
                string cn = ce.CommandName;
                if (cn ==  NextViewCommandName) {
                    if (ActiveViewIndex < Views.Count - 1) {
                       ActiveViewIndex = ActiveViewIndex + 1; 
                    }
                    else { 
                        ActiveViewIndex = - 1; 
                    }
                    return true; 
                }
                else if (cn == PreviousViewCommandName) {
                    if (ActiveViewIndex > -1 ) {
                        ActiveViewIndex = ActiveViewIndex - 1; 
                    }
                    return true; 
                } 
                else if (cn == SwitchViewByIDCommandName) {
                    View view = FindControl((string)ce.CommandArgument) as View; 
                    if (view != null && view.Parent == this) {
                        SetActiveView(view);
                        return true;
                    } 
                    else {
                        throw new HttpException(SR.GetString( 
                            SR.MultiView_invalid_view_id, ID, 
                            (string)ce.CommandArgument, SwitchViewByIDCommandName));
                    } 
                }
                else if (cn == SwitchViewByIndexCommandName) {
                    int index;
                    try { 
                        index = Int32.Parse((string)ce.CommandArgument, CultureInfo.InvariantCulture);
                    } 
                    catch (FormatException) { 
                        throw new FormatException(SR.GetString(
                            SR.MultiView_invalid_view_index_format, 
                            (string)ce.CommandArgument, SwitchViewByIndexCommandName));
                    }
                    ActiveViewIndex = index;
                    return true; 
                }
            } 
            return false; 
        }
 

        /// 
        /// 
        ///    Overridden to handle navigation between child views. 
        /// 
        protected internal override void OnInit(EventArgs e) { 
            base.OnInit(e); 

            Page.RegisterRequiresControlState(this); 

            if (_cachedActiveViewIndex > -1) {
                ActiveViewIndex = _cachedActiveViewIndex;
                _cachedActiveViewIndex = -1; 
                GetActiveView();
            } 
        } 

 
        protected internal override void RemovedControl(Control ctl) {
            if (((View)ctl).Active && ActiveViewIndex < Views.Count) {
                GetActiveView();
            } 
            base.RemovedControl(ctl);
        } 
 

        protected internal override void Render(HtmlTextWriter writer) { 
            View activeView = GetActiveView();
            if (activeView != null) {
                activeView.RenderControl(writer);
            } 
        }
 
 
        /// 
        /// Saves the control state. 
        /// 
        protected internal override object SaveControlState() {
            int avi = ActiveViewIndex;
            object obj = base.SaveControlState(); 
            if (obj != null || avi != -1) {
                return new Pair(obj, avi); 
            } 
            return null;
        } 


        /// 
        /// [To be supplied.] 
        /// 
        public void SetActiveView(View view) { 
            int index = Views.IndexOf (view); 
            if (index < 0) {
                throw new HttpException(SR.GetString(SR.MultiView_view_not_found, (view == null ? "null" : view.ID), this.ID)); 
            }
            ActiveViewIndex = index;
        }
    } 

 
    ///  [To be supplied.]  
    public class MultiViewControlBuilder : ControlBuilder {
 
        public override void AppendSubBuilder(ControlBuilder subBuilder) {
            if (subBuilder is CodeBlockBuilder) {
                throw new Exception(SR.GetString(SR.Multiview_rendering_block_not_allowed));
            } 
            base.AppendSubBuilder(subBuilder);
        } 
    } 

 

    ///  [To be supplied.] 
    public class ViewCollection : ControlCollection {
 

        ///  [To be supplied.]  
        public ViewCollection (Control owner) : base (owner) {} 

 
        ///  [To be supplied.] 
        public override void Add(Control v) {
            if (!(v is View)) {
                throw new ArgumentException(SR.GetString(SR.ViewCollection_must_contain_view)); 
            }
            base.Add(v); 
        } 

 
        ///  [To be supplied.] 
        public override void AddAt(int index, Control v) {
            if (!(v is View)) {
                throw new ArgumentException(SR.GetString(SR.ViewCollection_must_contain_view)); 
            }
            base.AddAt(index, v); 
        } 

 
        ///  [To be supplied.] 
        public new View this[int i] {
            get {
                return (View)base[i]; 
            }
        } 
    } 
}

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

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