LayoutEditorPart.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / WebParts / LayoutEditorPart.cs / 1 / LayoutEditorPart.cs
                        

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

namespace System.Web.UI.WebControls.WebParts { 
 
    using System;
    using System.Collections; 
    using System.ComponentModel;
    using System.Diagnostics;
    using System.Globalization;
    using System.Security.Permissions; 
    using System.Web.UI;
    using System.Web.UI.WebControls; 
 
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    public sealed class LayoutEditorPart : EditorPart { 

        private DropDownList _chromeState;
        private DropDownList _zone;
        // 

        private TextBox _zoneIndex; 
 
        private string _chromeStateErrorMessage;
        private string _zoneIndexErrorMessage; 

        private const int TextBoxColumns = 10;
        private const int MinZoneIndex = 0;
 
        private bool CanChangeChromeState {
            get { 
                WebPart webPart = WebPartToEdit; 
                if (!webPart.Zone.AllowLayoutChange) {
                    return false; 
                }
                else if (!webPart.AllowMinimize) {
                    // If AllowMinimize is false, the dropdown can be used to restore the WebPart
                    // but not to minimize the WebPart. 
                    return (webPart.ChromeState == PartChromeState.Minimized);
                } 
                else { 
                    return true;
                } 
            }
        }

        private bool CanChangeZone { 
            get {
                WebPart webPart = WebPartToEdit; 
                WebPartZoneBase currentZone = webPart.Zone; 
                return (currentZone.AllowLayoutChange && webPart.AllowZoneChange);
            } 
        }

        private bool CanChangeZoneIndex {
            get { 
                return WebPartToEdit.Zone.AllowLayoutChange;
            } 
        } 

        [Browsable(false), EditorBrowsable(EditorBrowsableState.Never), Themeable(false)] 
        public override string DefaultButton {
            get { return base.DefaultButton; }
            set { base.DefaultButton = value; }
        } 

        public override bool Display { 
            get { 
                // Don't return base.Display, since we want to show the layout editor part even
                // if AllowEdit is false on the WebPartToEdit, or the WebPartToEdit is a ProxyWebPart. 
                return true;
            }
        }
 
        private bool HasError {
            get { 
                return (_chromeStateErrorMessage != null || _zoneIndexErrorMessage != null); 
            }
        } 

        [
        WebSysDefaultValue(SR.LayoutEditorPart_PartTitle),
        ] 
        public override string Title {
            get { 
                string s = (string)ViewState["Title"]; 
                return (s != null) ? s : SR.GetString(SR.LayoutEditorPart_PartTitle);
            } 
            set {
                ViewState["Title"] = value;
            }
        } 

        public override bool ApplyChanges() { 
            WebPart webPart = WebPartToEdit; 
            if (webPart != null) {
                EnsureChildControls(); 

                try {
                    if (CanChangeChromeState) {
                        TypeConverter chromeStateConverter = TypeDescriptor.GetConverter(typeof(PartChromeState)); 
                        webPart.ChromeState = (PartChromeState)chromeStateConverter.ConvertFromString(_chromeState.SelectedValue);
                    } 
                } 
                catch (Exception e) {
                    _chromeStateErrorMessage = CreateErrorMessage(e.Message); 
                }

                int zoneIndex = webPart.ZoneIndex;
                if (CanChangeZoneIndex) { 
                    if (Int32.TryParse(_zoneIndex.Text, NumberStyles.Integer, CultureInfo.CurrentCulture, out zoneIndex)) {
                        if (zoneIndex < MinZoneIndex) { 
                            _zoneIndexErrorMessage = SR.GetString( 
                                SR.EditorPart_PropertyMinValue, MinZoneIndex.ToString(CultureInfo.CurrentCulture));
                        } 
                    }
                    else {
                        _zoneIndexErrorMessage = SR.GetString(SR.EditorPart_PropertyMustBeInteger);
                    } 
                }
 
                WebPartZoneBase oldZone = webPart.Zone; 
                WebPartZoneBase newZone = oldZone;
                if (CanChangeZone) { 
                    newZone = WebPartManager.Zones[_zone.SelectedValue];
                }

                // Do not call MoveWebPart if the WebPart is currently in the correct position (VSWhidbey 374634) 
                if (_zoneIndexErrorMessage == null && oldZone.AllowLayoutChange && newZone.AllowLayoutChange &&
                    (webPart.Zone != newZone || webPart.ZoneIndex != zoneIndex)) { 
                    try { 
                        WebPartManager.MoveWebPart(webPart, newZone, zoneIndex);
                    } 
                    catch (Exception e) {
                        // Zone and ZoneIndex are set at the same time.  Use the _zoneIndexErrorMessage, since it is
                        // more likely that a bogus ZoneIndex would cause an error.
                        _zoneIndexErrorMessage = CreateErrorMessage(e.Message); 
                    }
                } 
            } 

            return !HasError; 
        }

        protected internal override void CreateChildControls() {
            ControlCollection controls = Controls; 
            controls.Clear();
 
            TypeConverter chromeStateConverter = TypeDescriptor.GetConverter(typeof(PartChromeState)); 
            _chromeState = new DropDownList();
            _chromeState.Items.Add(new ListItem(SR.GetString(SR.PartChromeState_Normal), 
                                               chromeStateConverter.ConvertToString(PartChromeState.Normal)));
            _chromeState.Items.Add(new ListItem(SR.GetString(SR.PartChromeState_Minimized),
                                               chromeStateConverter.ConvertToString(PartChromeState.Minimized)));
            controls.Add(_chromeState); 

            // Add all zones to dropdown in CreateChildControls.  Items will be selected and/or disabled 
            // in SyncChanges.  Assumes no Zones are added or removed during page execution. 
            _zone = new DropDownList();
            WebPartManager manager = WebPartManager; 
            if (manager != null) {
                WebPartZoneCollection zones = manager.Zones;
                if (zones != null) {
                    foreach (WebPartZoneBase zone in zones) { 
                        ListItem item = new ListItem(zone.DisplayTitle, zone.ID);
                        _zone.Items.Add(item); 
                    } 
                }
            } 
            controls.Add(_zone);

            _zoneIndex = new TextBox();
            _zoneIndex.Columns = TextBoxColumns; 
            controls.Add(_zoneIndex);
 
            // We don't need viewstate enabled on our child controls.  Disable for perf. 
            foreach (Control c in controls) {
                c.EnableViewState = false; 
            }
        }

        protected internal override void OnPreRender(EventArgs e) { 
            base.OnPreRender(e);
 
            // We want to synchronize the EditorPart to the state of the WebPart on every page load, 
            // so we stay current if the WebPart changes in the background.
            if (Display && Visible && !HasError) { 
                SyncChanges();
            }
        }
 
        protected internal override void RenderContents(HtmlTextWriter writer) {
            if (Page != null) { 
                Page.VerifyRenderingInServerForm(this); 
            }
 
            // HACK: Need this for child controls to be created at design-time when control is inside template
            EnsureChildControls();

            if (DesignMode) { 
                // Add sample zone to dropdown
                _zone.Items.Add(SR.GetString(SR.Zone_SampleHeaderText)); 
            } 

            string[] propertyDisplayNames = new string[] { 
                SR.GetString(SR.LayoutEditorPart_ChromeState),
                SR.GetString(SR.LayoutEditorPart_Zone),
                SR.GetString(SR.LayoutEditorPart_ZoneIndex),
            }; 

            WebControl[] propertyEditors = new WebControl[] { 
                _chromeState, 
                _zone,
                _zoneIndex, 
            };

            string[] errorMessages = new string[] {
                _chromeStateErrorMessage, 
                null,
                _zoneIndexErrorMessage, 
            }; 

            RenderPropertyEditors(writer, propertyDisplayNames, null /* propertyDescriptions */, 
                                  propertyEditors, errorMessages);
        }

        public override void SyncChanges() { 
            WebPart webPart = WebPartToEdit;
 
            Debug.Assert(webPart != null); 
            if (webPart != null) {
                WebPartZoneBase currentZone = webPart.Zone; 
                bool allowLayoutChange = currentZone.AllowLayoutChange;

                EnsureChildControls();
 
                TypeConverter chromeStateConverter = TypeDescriptor.GetConverter(typeof(PartChromeState));
                _chromeState.SelectedValue = chromeStateConverter.ConvertToString(webPart.ChromeState); 
                _chromeState.Enabled = CanChangeChromeState; 

                WebPartManager manager = WebPartManager; 
                Debug.Assert(manager != null);
                if (manager != null) {
                    WebPartZoneCollection zones = manager.Zones;
                    bool allowZoneChange = webPart.AllowZoneChange; 

                    _zone.ClearSelection(); 
                    foreach (ListItem item in _zone.Items) { 
                        string zoneID = item.Value;
                        WebPartZoneBase zone = zones[zoneID]; 
                        if (zone == currentZone || (allowZoneChange && zone.AllowLayoutChange)) {
                            item.Enabled = true;
                        }
                        else { 
                            item.Enabled = false;
                        } 
 
                        if (zone == currentZone) {
                            item.Selected = true; 
                        }
                    }

                    _zone.Enabled = CanChangeZone; 
                }
 
                _zoneIndex.Text = webPart.ZoneIndex.ToString(CultureInfo.CurrentCulture); 
                _zoneIndex.Enabled = CanChangeZoneIndex;
            } 
        }
    }
}

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