tabitem.cs

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//------------------------------------------------------------------------------
// Copyright (c) 2000-2003 Microsoft Corporation. All Rights Reserved.
//------------------------------------------------------------------------------

namespace Microsoft.Web.UI.WebControls
{
    using System;
    using System.ComponentModel;
    using System.ComponentModel.Design;
    using System.Collections;
    using System.Drawing;
    using System.Drawing.Design;
    using System.Web.UI;
    using System.Web.UI.WebControls;
    using System.Web.UI.HtmlControls;
    using System.Reflection;

    /// <summary>
    /// Base class for child nodes of a TabStrip.
    /// </summary>
    [ToolboxItem(false)]
    public abstract class TabItem : BaseChildNode
    {
        private TabStrip _Parent;
        private CssCollection _DefaultStyle;
        private CssCollection _HoverStyle;
        private CssCollection _SelectedStyle;

        /// <summary>
        /// Initializes a new instance of a TabItem.
        /// </summary>
        public TabItem() : base()
        {
            _DefaultStyle = new CssCollection();
            _HoverStyle = new CssCollection();
            _SelectedStyle = new CssCollection();
        }

        /// <summary>
        /// Returns a String that represents the current Object.
        /// </summary>
        /// <returns>A String that represents the current Object.</returns>
        public override string ToString()
        {
            string name = this.GetType().Name;

            if (ID != String.Empty)
            {
                name += " - " + ID;
            }

            return name;
        }

        /// <summary>
        /// Creates a new object that is a copy of the current instance.
        /// </summary>
        /// <returns>A new object that is a copy of this instance.</returns>
        public override object Clone()
        {
            TabItem copy = (TabItem)base.Clone();

            copy._DefaultStyle = (CssCollection)this._DefaultStyle.Clone();
            copy._HoverStyle = (CssCollection)this._HoverStyle.Clone();
            copy._SelectedStyle = (CssCollection)this._SelectedStyle.Clone();

            return copy;
        }

        /// <summary>
        /// The TabStrip control that contains this item.
        /// </summary>
        [Browsable(false)]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
        public TabStrip ParentTabStrip
        {
            get { return _Parent; }
        }

        /// <summary>
        /// Returns the parent object.
        /// </summary>
        public override object Parent
        {
            get { return ParentTabStrip; }
        }

        /// <summary>
        /// Sets the parent of this item.
        /// </summary>
        /// <param name="parent">The parent TabStrip.</param>
        internal void SetParentTabStrip(TabStrip parent)
        {
            _Parent = parent;
        }

        /// <summary>
        /// Sets all items within the StateBag to be dirty
        /// </summary>
        protected internal override void SetViewStateDirty()
        {
            base.SetViewStateDirty();

            DefaultStyle.Dirty = true;
            HoverStyle.Dirty = true;
            SelectedStyle.Dirty = true;
        }

        /// <summary>
        /// Sets all items within the StateBag to be clean
        /// </summary>
        protected internal override void SetViewStateClean()
        {
            base.SetViewStateClean();

            DefaultStyle.Dirty = false;
            HoverStyle.Dirty = false;
            SelectedStyle.Dirty = false;
        }

        /// <summary>
        /// Gets or sets the keyboard shortcut key (AccessKey) for setting focus to the item.
        /// </summary>
        [DefaultValue("")]
        [Category("Behavior")]
        [ResDescription("BaseAccessKey")]
        public virtual string AccessKey
        {
            get
            {
                object obj = ViewState["AccessKey"];
                return (obj == null) ? String.Empty : (string)obj;
            }

            set { ViewState["AccessKey"] = value; }
        }

        /// <summary>
        /// Gets or sets a value indicating whether the item is enabled.
        /// </summary>
        [DefaultValue(true)]
        [Category("Behavior")]
        [ResDescription("BaseEnabled")]
        public virtual bool Enabled
        {
            get
            {
                object obj = ViewState["Enabled"];
                return (obj == null) ? true : (bool)obj;
            }

            set { ViewState["Enabled"] = value; }
        }

        /// <summary>
        /// Gets or sets the tab index of the item.
        /// </summary>
        [DefaultValue((short)0)]
        [Category("Behavior")]
        [ResDescription("BaseTabIndex")]
        public virtual short TabIndex
        {
            get
            {
                object obj = ViewState["TabIndex"];
                return (obj == null) ? (short)0 : (short)obj;
            }

            set { ViewState["TabIndex"] = value; }
        }

        /// <summary>
        /// Gets or sets the tool tip for the item to be displayed when the mouse cursor is over the control.
        /// </summary>
        [DefaultValue("")]
        [Category("Appearance")]
        [ResDescription("BaseToolTip")]
        public virtual string ToolTip
        {
            get
            {
                object obj = ViewState["ToolTip"];
                return (obj == null) ? String.Empty : (string)obj;
            }

            set { ViewState["ToolTip"] = value; }
        }
        
        /// <summary>
        /// Retrieves the orientation from the ParentTabStrip.
        /// </summary>
        protected Orientation Orientation
        {
            get { return (ParentTabStrip == null) ? Orientation.Horizontal : ParentTabStrip.Orientation; }
        }

        /// <summary>
        /// The text string that will appear within a tab item.
        /// </summary>
        [
        Category("Appearance"),
        DefaultValue(""),
        PersistenceMode(PersistenceMode.Attribute),
        ResDescription("ItemText"),
        ]
        public string Text
        {
            get
            {
                string szText = (string)ViewState["Text"];
                return (szText == null) ? String.Empty : szText;
            }

            set
            {
                ViewState["Text"] = value;
            }
        }

        /// <summary>
        /// Url of the image to display within the tab item.
        /// </summary>
        [
        Category("Appearance"),
        DefaultValue(""),
        Editor(typeof(Microsoft.Web.UI.WebControls.Design.ObjectImageUrlEditor), typeof(UITypeEditor)),
        PersistenceMode(PersistenceMode.Attribute),
        ResDescription("DefaultImageUrl"),
        ]
        public string DefaultImageUrl
        {
            get
            {
                Object obj = ViewState["DefaultImageUrl"];
                return (obj == null) ? String.Empty : (string)obj;
            }

            set
            {
                ViewState["DefaultImageUrl"] = value;
            }
        }

        /// <summary>
        /// Url of the image to display within the tab item when in a hover state.
        /// </summary>
        [
        Category("Appearance"),
        DefaultValue(""),
        Editor(typeof(Microsoft.Web.UI.WebControls.Design.ObjectImageUrlEditor), typeof(UITypeEditor)),
        PersistenceMode(PersistenceMode.Attribute),
        ResDescription("HoverImageUrl"),
        ]
        public string HoverImageUrl
        {
            get
            {
                Object obj = ViewState["HoverImageUrl"];
                return (obj == null) ? String.Empty : (string)obj;
            }

            set
            {
                ViewState["HoverImageUrl"] = value;
            }
        }

        /// <summary>
        /// Url of the image to display within the tab item when in a selected state.
        /// </summary>
        [
        Category("Appearance"),
        DefaultValue(""),
        Editor(typeof(Microsoft.Web.UI.WebControls.Design.ObjectImageUrlEditor), typeof(UITypeEditor)),
        PersistenceMode(PersistenceMode.Attribute),
        ResDescription("SelectedImageUrl"),
        ]
        public string SelectedImageUrl
        {
            get
            {
                Object obj = ViewState["SelectedImageUrl"];
                return (obj == null) ? String.Empty : (string)obj;
            }

            set
            {
                ViewState["SelectedImageUrl"] = value;
            }
        }

        /// <summary>
        /// The style of the tab item.
        /// </summary>
        [
        Category("Appearance"),
        DefaultValue(typeof(CssCollection), ""),
        PersistenceMode(PersistenceMode.Attribute),
        ResDescription("ChildDefaultStyle"),
        ]
        public CssCollection DefaultStyle
        {
            get { return _DefaultStyle; }
            set
            {
                _DefaultStyle = value;
                if (((IStateManager)this).IsTrackingViewState)
                {
                    ((IStateManager)_DefaultStyle).TrackViewState();
                    _DefaultStyle.Dirty = true;
                }
            }
        }

        /// <summary>
        /// The style of the tab item when in a hover state.
        /// </summary>
        [
        Category("Appearance"),
        DefaultValue(typeof(CssCollection), ""),
        PersistenceMode(PersistenceMode.Attribute),
        ResDescription("ChildHoverStyle"),
        ]
        public CssCollection HoverStyle
        {
            get { return _HoverStyle; }
            set
            {
                _HoverStyle = value;
                if (((IStateManager)this).IsTrackingViewState)
                {
                    ((IStateManager)_HoverStyle).TrackViewState();
                    _HoverStyle.Dirty = true;
                }
            }
        }

        /// <summary>
        /// The style of the tab item when in a selected state.
        /// </summary>
        [
        Category("Appearance"),
        DefaultValue(typeof(CssCollection), ""),
        PersistenceMode(PersistenceMode.Attribute),
        ResDescription("ChildSelectedStyle"),
        ]
        public CssCollection SelectedStyle
        {
            get { return _SelectedStyle; }
            set
            {
                _SelectedStyle = value;
                if (((IStateManager)this).IsTrackingViewState)
                {
                    ((IStateManager)_SelectedStyle).TrackViewState();
                    _SelectedStyle.Dirty = true;
                }
            }
        }

        /// <summary>
        /// The product of merging local and global image urls.
        /// </summary>
        protected virtual string CurrentImageUrl
        {
            get
            {
                TabStrip parent = ParentTabStrip;
                bool isSep = this is TabSeparator;

                if (Active && (SelectedImageUrl != String.Empty))
                {
                    return SelectedImageUrl;
                }
                else if (Active && isSep && (parent != null) && (parent.SepSelectedImageUrl != String.Empty))
                {
                    return parent.SepSelectedImageUrl;
                }
                else if (DefaultImageUrl != String.Empty)
                {
                    return DefaultImageUrl;
                }
                else if (isSep && (parent != null) && (parent.SepDefaultImageUrl != String.Empty))
                {
                    return parent.SepDefaultImageUrl;
                }

                return String.Empty;
            }
        }

        /// <summary>
        /// The product of merging local and global styles.
        /// </summary>
        protected CssCollection CurrentStyle
        {
            get
            {
                CssCollection style = new CssCollection();
                bool isTab = (this is Tab);
                bool isSep = !isTab && (this is TabSeparator);

                CssCollection globalDefault = null, globalSelected = null, 
                    builtinDefault = null, builtinSelected = null;
                TabStrip parent = ParentTabStrip;