LayoutEditorPart.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 / WebParts / LayoutEditorPart.cs / 1305376 / 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.Web.UI; 
    using System.Web.UI.WebControls;
 
    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; 
            } 
        }
    } 
}

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

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