ImageDesigner.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / MIT / System / Web / UI / MobileControls / Design / ImageDesigner.cs / 1305376 / ImageDesigner.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Web.UI.Design.MobileControls 
{ 
    using System;
    using System.Collections; 
    using System.ComponentModel;
    using System.ComponentModel.Design;
    using System.Diagnostics;
    using System.Drawing; 
    using System.IO;
    using System.Text; 
    using System.Web.UI; 
    using System.Web.UI.Design;
    using System.Web.UI.MobileControls; 
    using System.Web.UI.MobileControls.Adapters;
    using System.Web.UI.Design.MobileControls.Adapters;
    using System.Web.UI.Design.MobileControls.Converters;
    using System.Web.UI.Design.MobileControls.Util; 

    using Image = System.Web.UI.MobileControls.Image; 
 
    [
        System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Demand, 
        Flags=System.Security.Permissions.SecurityPermissionFlag.UnmanagedCode)
    ]
    [Obsolete("The System.Web.Mobile.dll assembly has been deprecated and should no longer be used. For information about how to develop ASP.NET mobile applications, see http://go.microsoft.com/fwlink/?LinkId=157231.")]
    internal class ImageDesigner : MobileControlDesigner 
    {
        private Image                   _image; 
        private TemporaryBitmapFile     _tempBmpFile; 
        private Uri                     _cachedWbmpUri;
        private String                  _baseUrl = String.Empty; 

        private String BaseUrl
        {
            get 
            {
                if (_baseUrl != null && _baseUrl.Length == 0) 
                { 
                    IWebFormsDocumentService wfServices =
                        (IWebFormsDocumentService)GetService(typeof(IWebFormsDocumentService)); 

                                        Debug.Assert(wfServices != null);
                    _baseUrl = wfServices.DocumentUrl;
                } 
                return _baseUrl;
            } 
        } 

        ///  
        ///    
        ///       Initializes the designer.
        ///    
        ///  
        /// 
        ///    The control element being designed. 
        ///  
        /// 
        ///     
        ///       This is called by the designer host to establish the component being
        ///       designed.
        ///    
        ///  
        /// 
        public override void Initialize(IComponent component) 
        { 
            Debug.Assert(component is System.Web.UI.MobileControls.Image,
                         "ImageDesigner.Initialize - Invalid Image Control"); 
            _image = (System.Web.UI.MobileControls.Image) component;
            base.Initialize(component);
        }
 
        /// 
        ///     
        ///       Disposes of the resources (other than memory) used by the 
        ///    .
        ///     
        /// 
        /// 
        ///    
        ///       Call  when 
        ///       you are finished using the . The  method leaves the  in an unusable state. After
        ///       calling , you must release all 
        ///       references to the  so the memory it was occupying 
        ///       can be reclaimed by garbage collection.
        ///     
        ///    
        ///       Always call  before you release your last reference to
        ///       the . Otherwise, the resources
        ///       the  is using will not be freed 
        ///       until garbage collection calls the  object's
        ///       destructor. 
        ///     
        /// 
        ///  
        protected override void Dispose(bool disposing)
        {
            if (disposing && _tempBmpFile != null)
            { 
                _tempBmpFile.Dispose();
                _cachedWbmpUri = null; 
                _tempBmpFile = null; 
            }
 
            base.Dispose(disposing);
        }

        private String GetConvertedImageURI(String imageUriString) 
        {
            Uri baseUri = new Uri(BaseUrl); 
            Uri imageUri = new Uri(baseUri, imageUriString); 
            String extension = Path.GetExtension(imageUriString);
 
            if(extension.Equals(".wbmp"))
            {
                if(_tempBmpFile != null)
                { 
                    if(_cachedWbmpUri != null
                        && _cachedWbmpUri.Equals(imageUri)) 
                    { 
                        return _tempBmpFile.Url;
                    } 
                    else
                    {
                        _tempBmpFile.Dispose();
                        _tempBmpFile = null; 
                        _cachedWbmpUri = null;
                    } 
                } 

                Byte[] buffer = FileReader.Read(imageUri); 
                if(buffer == null)
                {
                    // Could not read image from URI, return original URI to
                    // Trident and let it render as a broken image. 
                    goto ConversionError;
                } 
                Bitmap bitmap = WbmpConverter.Convert(buffer); 
                if(bitmap == null)
                { 
                    // .wbmp appears to be corrupt, return original URI to
                    // Trident and let it render as a broken image.
                    goto ConversionError;
                } 
                _tempBmpFile = new TemporaryBitmapFile(bitmap);
                imageUriString = _tempBmpFile.Url; 
                _cachedWbmpUri = imageUri; 
            }
ConversionError: 
            return imageUriString;
        }

 
        /// 
        ///     
        ///       Gets the HTML to be used for the design time representation of the control runtime. 
        ///    
        ///  
        /// 
        ///    
        ///       The design time HTML.
        ///     
        /// 
        protected override String GetDesignTimeNormalHtml() 
        { 
            String tempUrl = String.Empty;
            bool replaceUrl = (_image.ImageUrl.Length > 0); 
            DesignerTextWriter writer = new DesignerTextWriter();

            tempUrl = _image.ImageUrl;
            _image.ImageUrl = GetConvertedImageURI(_image.ImageUrl); 
            _image.Adapter.Render(writer);
            _image.ImageUrl = tempUrl; 
 
            return writer.ToString();
        } 

        public override void OnComponentChanged(Object sender, ComponentChangedEventArgs e)
        {
            if ((e.Member != null) && e.Member.Name.Equals("NavigateUrl")) 
            {
                _image.NavigateUrl = NavigateUrlConverter.GetUrl( 
                    _image, 
                    e.NewValue.ToString(),
                    e.OldValue.ToString() 
                    );

                e = new ComponentChangedEventArgs(e.Component, e.Member, e.OldValue, _image.NavigateUrl);
            } 

            base.OnComponentChanged(sender, e); 
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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ImageDesigner.cs source code in C# .NET

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