369 lines
11 KiB
C#
369 lines
11 KiB
C#
//
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// System.Web.UI.WebControls.ImageField.cs
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//
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// Authors:
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// Lluis Sanchez Gual (lluis@novell.com)
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//
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// (C) 2005-2010 Novell, Inc (http://www.novell.com)
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//
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System.Collections;
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using System.Collections.Specialized;
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using System.Web.UI;
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using System.ComponentModel;
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using System.Security.Permissions;
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using System.Reflection;
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namespace System.Web.UI.WebControls {
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[AspNetHostingPermissionAttribute (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
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[AspNetHostingPermissionAttribute (SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
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public class ImageField : DataControlField
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{
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public static readonly string ThisExpression = "!";
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PropertyDescriptor imageProperty;
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PropertyDescriptor textProperty;
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public override bool Initialize (bool sortingEnabled, Control control)
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{
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return base.Initialize (sortingEnabled, control);
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}
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[DefaultValueAttribute ("")]
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[LocalizableAttribute (true)]
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[WebSysDescription ("")]
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[WebCategoryAttribute ("Appearance")]
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public virtual string AlternateText {
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get {
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object ob = ViewState ["AlternateText"];
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if (ob != null)
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return (string) ob;
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return String.Empty;
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}
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set {
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ViewState ["AlternateText"] = value;
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OnFieldChanged ();
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}
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}
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[DefaultValueAttribute (true)]
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[WebSysDescription ("")]
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[WebCategoryAttribute ("Behavior")]
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public virtual bool ConvertEmptyStringToNull {
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get {
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object ob = ViewState ["ConvertEmptyStringToNull"];
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if (ob != null)
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return (bool) ob;
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return true;
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}
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set {
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ViewState ["ConvertEmptyStringToNull"] = value;
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OnFieldChanged ();
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}
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}
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[TypeConverterAttribute ("System.Web.UI.Design.DataSourceViewSchemaConverter, " + Consts.AssemblySystem_Design)]
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[DefaultValueAttribute ("")]
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[WebSysDescription ("")]
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[WebCategoryAttribute ("Data")]
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public virtual string DataAlternateTextField {
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get {
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object ob = ViewState ["DataAlternateTextField"];
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if (ob != null)
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return (string) ob;
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return String.Empty;
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}
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set {
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ViewState ["DataAlternateTextField"] = value;
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OnFieldChanged ();
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}
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}
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[DefaultValueAttribute ("")]
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[WebSysDescription ("")]
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[WebCategoryAttribute ("Data")]
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public virtual string DataAlternateTextFormatString {
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get {
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object ob = ViewState ["DataAlternateTextFormatString"];
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if (ob != null)
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return (string) ob;
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return String.Empty;
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}
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set {
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ViewState ["DataAlternateTextFormatString"] = value;
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OnFieldChanged ();
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}
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}
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[TypeConverterAttribute ("System.Web.UI.Design.DataSourceViewSchemaConverter, " + Consts.AssemblySystem_Design)]
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[DefaultValueAttribute ("")]
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[WebSysDescription ("")]
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[WebCategoryAttribute ("Data")]
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public virtual string DataImageUrlField {
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get {
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object ob = ViewState ["DataImageUrlField"];
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if (ob != null)
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return (string) ob;
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return String.Empty;
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}
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set {
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ViewState ["DataImageUrlField"] = value;
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OnFieldChanged ();
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}
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}
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[DefaultValueAttribute ("")]
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[WebSysDescription ("")]
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[WebCategoryAttribute ("Data")]
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public virtual string DataImageUrlFormatString {
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get {
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object ob = ViewState ["DataImageUrlFormatString"];
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if (ob != null)
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return (string) ob;
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return String.Empty;
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}
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set {
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ViewState ["DataImageUrlFormatString"] = value;
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OnFieldChanged ();
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}
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}
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[DefaultValueAttribute ("")]
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[LocalizableAttribute (true)]
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[WebSysDescription ("")]
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[WebCategoryAttribute ("Behavior")]
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public virtual string NullDisplayText {
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get {
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object ob = ViewState ["NullDisplayText"];
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if (ob != null) return (string) ob;
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return "";
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}
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set {
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ViewState ["NullDisplayText"] = value;
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OnFieldChanged ();
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}
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}
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[DefaultValueAttribute ("")]
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[EditorAttribute ("System.Web.UI.Design.ImageUrlEditor, " + Consts.AssemblySystem_Design, "System.Drawing.Design.UITypeEditor, " + Consts.AssemblySystem_Drawing)]
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[UrlPropertyAttribute]
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[WebSysDescription ("")]
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[WebCategoryAttribute ("Behavior")]
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public virtual string NullImageUrl {
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get {
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object ob = ViewState ["NullImageUrl"];
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if (ob != null)
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return (string) ob;
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return String.Empty;
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}
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set {
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ViewState ["NullImageUrl"] = value;
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OnFieldChanged ();
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}
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}
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[DefaultValueAttribute (false)]
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[WebSysDescription ("")]
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[WebCategoryAttribute ("Behavior")]
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public virtual bool ReadOnly {
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get {
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object val = ViewState ["ReadOnly"];
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return val != null ? (bool) val : false;
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}
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set {
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ViewState ["ReadOnly"] = value;
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OnFieldChanged ();
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}
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}
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public override void ExtractValuesFromCell (IOrderedDictionary dictionary, DataControlFieldCell cell, DataControlRowState rowState, bool includeReadOnly)
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{
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if ((ReadOnly && !includeReadOnly) || cell.Controls.Count == 0)
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return;
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bool editable = (rowState & (DataControlRowState.Edit | DataControlRowState.Insert)) != 0;
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if (includeReadOnly || editable) {
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Control control = cell.Controls [0];
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//TODO: other controls?
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if (control is Image)
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dictionary [DataImageUrlField] = ((Image)control).ImageUrl;
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else if (control is TextBox)
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dictionary [DataImageUrlField] = ((TextBox) control).Text;
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}
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}
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public override void InitializeCell (DataControlFieldCell cell, DataControlCellType cellType, DataControlRowState rowState, int rowIndex)
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{
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base.InitializeCell (cell, cellType, rowState, rowIndex);
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if (cellType == DataControlCellType.DataCell) {
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InitializeDataCell (cell, rowState);
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if ((rowState & DataControlRowState.Insert) == 0)
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cell.DataBinding += new EventHandler (OnDataBindField);
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}
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}
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protected virtual void InitializeDataCell (DataControlFieldCell cell, DataControlRowState rowState)
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{
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bool editable = (rowState & (DataControlRowState.Edit | DataControlRowState.Insert)) != 0;
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if (editable && !ReadOnly) {
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TextBox box = new TextBox ();
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cell.Controls.Add (box);
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} else if (DataImageUrlField.Length > 0) {
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Image img = new Image ();
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img.ControlStyle.CopyFrom (ControlStyle);
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cell.Controls.Add (img);
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}
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}
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protected virtual string FormatImageUrlValue (object value)
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{
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if (value == null)
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return null;
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else if (DataImageUrlFormatString.Length > 0)
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return string.Format (DataImageUrlFormatString, value);
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else
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return value.ToString ();
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}
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protected virtual string GetFormattedAlternateText (Control controlContainer)
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{
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if (DataAlternateTextField.Length > 0) {
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if (textProperty == null)
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textProperty = GetProperty (controlContainer, DataAlternateTextField);
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object value = GetValue (controlContainer, DataAlternateTextField, ref textProperty);
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if (value == null || (value.ToString().Length == 0 && ConvertEmptyStringToNull))
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return NullDisplayText;
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else if (DataAlternateTextFormatString.Length > 0)
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return string.Format (DataAlternateTextFormatString, value);
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else
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return value.ToString ();
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} else
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return AlternateText;
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}
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protected virtual object GetValue (Control controlContainer, string fieldName, ref PropertyDescriptor cachedDescriptor)
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{
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if (DesignMode)
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return GetDesignTimeValue ();
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else {
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object dataItem = DataBinder.GetDataItem (controlContainer);
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if (dataItem == null)
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throw new HttpException ("A data item was not found in the container. The container must either implement IDataItemContainer, or have a property named DataItem.");
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if (fieldName == ThisExpression)
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return dataItem;
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else {
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if (cachedDescriptor != null) return cachedDescriptor.GetValue (dataItem);
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PropertyDescriptor prop = GetProperty (controlContainer, fieldName);
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return prop.GetValue (dataItem);
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}
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}
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}
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PropertyDescriptor GetProperty (Control controlContainer, string fieldName)
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{
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if (fieldName == ThisExpression)
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return null;
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IDataItemContainer dic = (IDataItemContainer) controlContainer;
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PropertyDescriptorCollection properties = TypeDescriptor.GetProperties (dic.DataItem);
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PropertyDescriptor prop = properties != null ? properties [fieldName] : null;
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if (prop == null)
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throw new InvalidOperationException ("Property '" + fieldName + "' not found in object of type " + dic.DataItem.GetType());
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return prop;
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}
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protected virtual string GetDesignTimeValue ()
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{
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return "Databound";
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}
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protected virtual void OnDataBindField (object sender, EventArgs e)
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{
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Control control = (Control) sender;
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ControlCollection controls = control != null ? control.Controls : null;
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Control namingContainer = control.NamingContainer;
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Control c;
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if (sender is DataControlFieldCell) {
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if (controls.Count == 0)
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return;
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c = controls [0];
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} else if (sender is Image || sender is TextBox)
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c = control;
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else
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return;
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if (imageProperty == null)
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imageProperty = GetProperty (namingContainer, DataImageUrlField);
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if (c is TextBox) {
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object val = GetValue (namingContainer, DataImageUrlField, ref imageProperty);
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((TextBox)c).Text = val != null ? val.ToString() : String.Empty;
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} else if (c is Image) {
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Image img = (Image)c;
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string value = FormatImageUrlValue (GetValue (namingContainer, DataImageUrlField, ref imageProperty));
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if (value == null || (ConvertEmptyStringToNull && value.Length == 0)) {
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if (NullImageUrl == null || NullImageUrl.Length == 0) {
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c.Visible = false;
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Label label = new Label ();
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label.Text = NullDisplayText;
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controls.Add (label);
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} else
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value = NullImageUrl;
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}
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img.ImageUrl = value;
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img.AlternateText = GetFormattedAlternateText (namingContainer);
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}
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}
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public override void ValidateSupportsCallback ()
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{
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}
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protected override DataControlField CreateField ()
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{
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return new ImageField ();
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}
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protected override void CopyProperties (DataControlField newField)
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{
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base.CopyProperties (newField);
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ImageField field = (ImageField) newField;
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field.AlternateText = AlternateText;
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field.ConvertEmptyStringToNull = ConvertEmptyStringToNull;
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field.DataAlternateTextField = DataAlternateTextField;
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field.DataAlternateTextFormatString = DataAlternateTextFormatString;
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field.DataImageUrlField = DataImageUrlField;
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field.DataImageUrlFormatString = DataImageUrlFormatString;
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field.NullDisplayText = NullDisplayText;
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field.NullImageUrl = NullImageUrl;
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field.ReadOnly = ReadOnly;
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}
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}
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}
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