//------------------------------------------------------------------------------
// <copyright file="Panel.cs" company="Microsoft">
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// </copyright>
//------------------------------------------------------------------------------

namespace System.Web.UI.WebControls {

    using System;
    using System.ComponentModel;
    using System.Drawing.Design;
    using System.Web;
    using System.Web.UI;
    using System.Web.Util;

    /// <devdoc>
    ///    <para>Constructs a panel for specifies layout regions
    ///       on a page and defines its properties.</para>
    /// </devdoc>
    [
    Designer("System.Web.UI.Design.WebControls.PanelContainerDesigner, " + AssemblyRef.SystemDesign),
    ParseChildren(false),
    PersistChildren(true),
    ]
    public class Panel : WebControl {
        private string _defaultButton;
        private bool _renderedFieldSet = false;


        /// <devdoc>
        ///    Initializes a new instance of the <see cref='System.Web.UI.WebControls.Panel'/> class.
        /// </devdoc>
        public Panel()
            : base(HtmlTextWriterTag.Div) {
        }


        /// <devdoc>
        ///    <para>Gets or sets the URL of the background image for the panel control.</para>
        /// </devdoc>
        [
        WebCategory("Appearance"),
        DefaultValue(""),
        Editor("System.Web.UI.Design.ImageUrlEditor, " + AssemblyRef.SystemDesign, typeof(UITypeEditor)),
        UrlProperty(),
        WebSysDescription(SR.Panel_BackImageUrl)
        ]
        public virtual string BackImageUrl {
            get {
                if (ControlStyleCreated == false) {
                    return String.Empty;
                }
                PanelStyle panelStyle = ControlStyle as PanelStyle;
                if (panelStyle != null) {
                    return panelStyle.BackImageUrl;
                }
                string s = (string)ViewState["BackImageUrl"];
                return((s == null) ? String.Empty : s);
            }
            set {
                PanelStyle panelStyle = ControlStyle as PanelStyle;
                if (panelStyle != null) {
                    panelStyle.BackImageUrl = value;
                }
                else {
                    ViewState["BackImageUrl"] = value;
                }
            }
        }


        /// <devdoc>
        ///     Gets or sets default button for the panel
        /// </devdoc>
        [
        DefaultValue(""),
        Themeable(false),
        WebCategory("Behavior"),
        WebSysDescription(SR.Panel_DefaultButton)
        ]
        public virtual string DefaultButton {
            get {
                if (_defaultButton == null) {
                    return String.Empty;
                }
                return _defaultButton;
            }
            set {
                _defaultButton = value;
            }
        }

        /// <devdoc>
        /// <para>Gets or sets the direction of text in the panel</para>
        /// </devdoc>
        [
        DefaultValue(ContentDirection.NotSet),
        WebCategory("Layout"),
        WebSysDescription(SR.Panel_Direction)
        ]
        public virtual ContentDirection Direction {
            get {
                if (ControlStyleCreated == false) {
                    return ContentDirection.NotSet;
                }
                PanelStyle panelStyle = ControlStyle as PanelStyle;
                if (panelStyle != null) {
                    return panelStyle.Direction;
                }
                object direction = ViewState["Direction"];
                return direction == null ? ContentDirection.NotSet : (ContentDirection) direction;
            }
            set {
                PanelStyle panelStyle = ControlStyle as PanelStyle;
                if (panelStyle != null) {
                    panelStyle.Direction = value;
                }
                else {
                    ViewState["Direction"] = value;
                }
            }
        }


        [
        Localizable(true),
        DefaultValue(""),
        WebCategory("Appearance"),
        WebSysDescription(SR.Panel_GroupingText)
        ]
        public virtual string GroupingText {
            get {
                string s = (string)ViewState["GroupingText"];
                return (s != null) ? s : String.Empty;
            }
            set {
                ViewState["GroupingText"] = value;
            }
        }


        /// <devdoc>
        ///    <para>Gets or sets the horizontal alignment of the contents within the panel.</para>
        /// </devdoc>
        [
        WebCategory("Layout"),
        DefaultValue(HorizontalAlign.NotSet),
        WebSysDescription(SR.Panel_HorizontalAlign)
        ]
        public virtual HorizontalAlign HorizontalAlign {
            get {
                if (ControlStyleCreated == false) {
                    return HorizontalAlign.NotSet;
                }
                PanelStyle panelStyle = ControlStyle as PanelStyle;
                if (panelStyle != null) {
                    return panelStyle.HorizontalAlign;
                }
                object o = ViewState["HorizontalAlign"];
                return ((o == null) ? HorizontalAlign.NotSet : (HorizontalAlign)o);
            }
            set {
                PanelStyle panelStyle = ControlStyle as PanelStyle;
                if (panelStyle != null) {
                    panelStyle.HorizontalAlign = value;
                }
                else {
                    if (value < HorizontalAlign.NotSet || value > HorizontalAlign.Justify) {
                        throw new ArgumentOutOfRangeException("value");
                    }
                    ViewState["HorizontalAlign"] = value;
                }
            }
        }

        public override bool SupportsDisabledAttribute {
            get {
                return RenderingCompatibility < VersionUtil.Framework40;
            }
        }

        /// <devdoc>
        /// <para>Gets or sets the scrollbar behavior of the panel.</para>
        /// </devdoc>
        [
        DefaultValue(ScrollBars.None),
        WebCategory("Layout"),
        WebSysDescription(SR.Panel_ScrollBars)
        ]
        public virtual ScrollBars ScrollBars {
            get {
                if (ControlStyleCreated == false) {
                    return ScrollBars.None;
                }
                PanelStyle panelStyle = ControlStyle as PanelStyle;
                if (panelStyle != null) {
                    return panelStyle.ScrollBars;
                }
                object scroll = ViewState["ScrollBars"];
                return ((scroll == null) ? ScrollBars.None : (ScrollBars)scroll);
            }
            set {
                PanelStyle panelStyle = ControlStyle as PanelStyle;
                if (panelStyle != null) {
                    panelStyle.ScrollBars = value;
                }
                else {
                    ViewState["ScrollBars"] = value;
                }
            }
        }


        /// <devdoc>
        ///    <para>Gets or sets a value
        ///       indicating whether the content wraps within the panel.</para>
        /// </devdoc>
        [
        WebCategory("Layout"),
        DefaultValue(true),
        WebSysDescription(SR.Panel_Wrap)
        ]
        public virtual bool Wrap {
            get {
                if (ControlStyleCreated == false) {
                    return true;
                }
                PanelStyle panelStyle = ControlStyle as PanelStyle;
                if (panelStyle != null) {
                    return panelStyle.Wrap;
                }
                object b = ViewState["Wrap"];
                return ((b == null) ? true : (bool)b);
            }
            set {
                PanelStyle panelStyle = ControlStyle as PanelStyle;
                if (panelStyle != null) {
                    panelStyle.Wrap = value;
                }
                else {
                    ViewState["Wrap"] = value;
                }
            }
        }


        /// <internalonly/>
        /// <devdoc>
        ///    Add background-image to list of style attributes to render.
        ///    Add align and nowrap to list of attributes to render.
        /// </devdoc>
        protected override void AddAttributesToRender(HtmlTextWriter writer) {
            base.AddAttributesToRender(writer);

            string s = BackImageUrl;
            // Whidbey 12856
            if (s.Trim().Length > 0) {
                writer.AddStyleAttribute(HtmlTextWriterStyle.BackgroundImage, "url(" + ResolveClientUrl(s) + ")");
            }

            AddScrollingAttribute(ScrollBars, writer);

            HorizontalAlign hAlign = HorizontalAlign;
            if (hAlign != HorizontalAlign.NotSet) {
                TypeConverter hac = TypeDescriptor.GetConverter(typeof(HorizontalAlign));
                writer.AddStyleAttribute(HtmlTextWriterStyle.TextAlign, hac.ConvertToInvariantString(hAlign).ToLowerInvariant());
            }

            if (!Wrap) {
                if (EnableLegacyRendering) {
                    writer.AddAttribute(HtmlTextWriterAttribute.Nowrap, "nowrap", false);
                }
                else {
                    writer.AddStyleAttribute(HtmlTextWriterStyle.WhiteSpace, "nowrap");
                }
            }

            if (Direction == ContentDirection.LeftToRight) {
                writer.AddAttribute(HtmlTextWriterAttribute.Dir, "ltr");
            }
            else if (Direction == ContentDirection.RightToLeft) {
                writer.AddAttribute(HtmlTextWriterAttribute.Dir, "rtl");
            }

            if (!DesignMode &&
                (Page != null) &&
                (Page.RequestInternal != null) &&
                (Page.Request.Browser.EcmaScriptVersion.Major > 0) &&
                (Page.Request.Browser.W3CDomVersion.Major > 0)) {
                if (DefaultButton.Length > 0) {
                    // Find control from the page if it's a hierarchical ID.
                    // Dev11 bug 19915
                    Control c = FindControlFromPageIfNecessary(DefaultButton);

                    if (c is IButtonControl) {
                        Page.ClientScript.RegisterDefaultButtonScript(c, writer, true /* UseAddAttribute */);
                    }
                    else {
                        throw new InvalidOperationException(SR.GetString(SR.HtmlForm_OnlyIButtonControlCanBeDefaultButton, ID));
                    }
                }
            }
        }

        /// <devdoc>
        ///    [To be supplied.]
        /// </devdoc>
        private void AddScrollingAttribute(ScrollBars scrollBars, HtmlTextWriter writer) {
            switch (scrollBars) {
                case ScrollBars.Horizontal:
                    writer.AddStyleAttribute(HtmlTextWriterStyle.OverflowX, "scroll");
                    break;
                case ScrollBars.Vertical:
                    writer.AddStyleAttribute(HtmlTextWriterStyle.OverflowY, "scroll");
                    break;
                case ScrollBars.Both:
                    writer.AddStyleAttribute(HtmlTextWriterStyle.Overflow, "scroll");
                    break;
                case ScrollBars.Auto:
                    writer.AddStyleAttribute(HtmlTextWriterStyle.Overflow, "auto");
                    break;
                default:
                    break;
            }
        }


        /// <internalonly/>
        /// <devdoc>
        ///    <para>A protected method. Creates a panel control style.</para>
        /// </devdoc>
        protected override Style CreateControlStyle() {
            return new PanelStyle(ViewState);
        }


        /// <internalonly/>
        public override void RenderBeginTag(HtmlTextWriter writer) {
            AddAttributesToRender(writer);

            HtmlTextWriterTag tagKey = TagKey;
            if (tagKey != HtmlTextWriterTag.Unknown) {
                writer.RenderBeginTag(tagKey);
            }
            else {
                writer.RenderBeginTag(TagName);
            }

            string s = GroupingText;
            bool useGrouping = (s.Length != 0) && !(writer is Html32TextWriter);
            if (useGrouping) {
                writer.RenderBeginTag(HtmlTextWriterTag.Fieldset);
                _renderedFieldSet = true;
                writer.RenderBeginTag(HtmlTextWriterTag.Legend);
                writer.Write(s);
                writer.RenderEndTag();
            }
        }

        public override void RenderEndTag(HtmlTextWriter writer) {
            if (_renderedFieldSet) {
                writer.RenderEndTag();
            }
            base.RenderEndTag(writer);
        }
    }
}