AssemblyInfo.cs (partial)

// Styles
[assembly: WebResource("GizmonicInstitute.WebControls.SampleControl.css", "text/css", PerformSubstitution = true)]

// Images
[assembly: WebResource("GizmonicInstitute.WebControls.cog.png", "image/png")]
[assembly: WebResource("GizmonicInstitute.WebControls.inner_shadow.png", "image/png")]

SampleControl.css

.SampleControl_TextBox {
 padding: 4px 0 0 4px;
 height: 1.5em;
 border: solid 1px Black;
 background-color: Yellow;
 background-image: url('<%=WebResource("GizmonicInstitute.WebControls.inner_shadow.png")%>');
 background-repeat: no-repeat;
 background-position: left top;
}

.SampleControl_Button {
 width: 2em;
 height: 2em;
 border-width: 2px;
 background-color: #EAEAEA;
 background-image: url('<%=WebResource("GizmonicInstitute.WebControls.cog.png")%>');
 background-repeat: no-repeat;
 background-position: center center;
}

SampleControl.cs

1    #region Using directives
2    using System;
3    using System.Collections.Generic;
4    using System.ComponentModel;
5    using System.Text;
6    using System.Web;
7    using System.Web.UI;
8    using System.Web.UI.HtmlControls;
9    using System.Web.UI.WebControls;
10   #endregion
11   
12   namespace GizmonicInstitute.WebControls {
13   
14       [Designer(typeof(SampleControlDesigner))]
15       [DefaultProperty("TextBoxText")]
16       [ToolboxData("<{0}:SampleControl runat=server>")]
17       public class SampleControl : CompositeControl {
18   
19           protected Label lblSample;
20           protected TextBox txtSample;
21           protected Button btnSample;
22   
23           [Bindable(true)]
24           [Category("Appearance")]
25           [DefaultValue("")]
26           [Description("Gets or sets the text caption displayed in the Button control.")]
27           public string LabelText {
28               get {
29                   object o = ViewState["LabelText"];
30                   return (o == null) ? String.Empty : (string)o;
31               }
32               set {
33                   ViewState["LabelText"] = value;
34                   RecreateChildControls();
35               }
36           }
37   
38           [Bindable(true)]
39           [Category("Appearance")]
40           [DefaultValue("")]
41           [Description("Gets or sets the text caption displayed in the Button control.")]
42           public string TextBoxText {
43               get {
44                   object o = ViewState["TextBoxText"];
45                   return (o == null) ? String.Empty : (string)o;
46               }
47               set {
48                   ViewState["TextBoxText"] = value;
49                   RecreateChildControls();
50               }
51           }
52   
53           [Bindable(true)]
54           [Category("Appearance")]
55           [DefaultValue("")]
56           [Description("Gets or sets the text caption displayed in the Button control.")]
57           public string ButtonText {
58               get {
59                   object o = ViewState["ButtonText"];
60                   return (o == null) ? String.Empty : (string)o;
61               }
62               set {
63                   ViewState["ButtonText"] = value;
64                   RecreateChildControls();
65               }
66           }
67   
68           protected void btnSample_Click(Object sender, EventArgs e) {
69               txtSample.Text = String.Format("Clicked at {0:h:mm:ss tt}", DateTime.Now );
70           }
71   
72           protected override void CreateChildControls() {
73               lblSample = new Label();
74               txtSample = new TextBox();
75               btnSample = new Button();
76   
77               lblSample.Text = this.LabelText;
78               txtSample.Text = this.TextBoxText;
79               btnSample.Text = this.ButtonText;
80   
81               txtSample.CssClass = "SampleControl_TextBox";
82               btnSample.CssClass = "SampleControl_Button";
83               btnSample.Click += new EventHandler(btnSample_Click);
84   
85               Controls.Add(lblSample);
86               Controls.Add(txtSample);
87               Controls.Add(btnSample);
88           }
89   
90           protected override void OnPreRender(EventArgs e) {
91               // Add embedded style sheet to parent page
92               HtmlLink cssLink = new HtmlLink();
93               cssLink.ID = "SampleControlCss";
94               cssLink.Href = Page.ClientScript.GetWebResourceUrl(this.GetType(), "GizmonicInstitute.WebControls.SampleControl.css");
95               cssLink.Attributes.Add("rel", "stylesheet");
96               cssLink.Attributes.Add("type", "text/css");
97               bool CssLinkAlreadyExists = false;
98               foreach (Control headctrl in Page.Header.Controls) {
99                   if (headctrl.ID == cssLink.ID) {
100                      CssLinkAlreadyExists = true;
101                      break;
102                  }
103              }
104              if (!CssLinkAlreadyExists) {
105                  Page.Header.Controls.AddAt(0, cssLink);
106              }
107          }
108  
109      }
110  }

SampleControlDesigner.cs

1    #region Using directives
2    using System;
3    using System.Web.UI;
4    using System.Text.RegularExpressions;
5    #endregion
6    
7    namespace GizmonicInstitute.WebControls {
8    
9        public class SampleControlDesigner : System.Web.UI.Design.ControlDesigner {
10           public override string GetDesignTimeHtml() {
11               System.Reflection.Assembly l_asm = System.Reflection.Assembly.GetExecutingAssembly();
12               System.IO.Stream l_css_res = l_asm.GetManifestResourceStream("GizmonicInstitute.WebControls.SampleControl.css");
13               System.IO.StreamReader l_stream = new System.IO.StreamReader(l_css_res);
14               string ls_css = l_stream.ReadToEnd();
15   
16               const string SUBSTITUTION_PATTERN = @"(<%=)\s*(WebResource\("")(?.+)\s*(""\)%>)";
17               Regex theRegex = new Regex(SUBSTITUTION_PATTERN);
18               ls_css = theRegex.Replace(ls_css, new MatchEvaluator(PerformSubstitution));
19   
20               return "" + base.GetDesignTimeHtml();
21           }
22   
23           private string PerformSubstitution(Match m) {
24               SampleControl thisWeightControl = (SampleControl)Component;
25               string replacedString = m.ToString();
26               replacedString = replacedString.Replace(m.Value, thisWeightControl.Page.ClientScript.GetWebResourceUrl(this.GetType(), m.Groups["resourceName"].Value));
27               return replacedString;
28           }
29       }
30   
31   }