provide control developer specified custom style classes and properties

src/lib/MBS.Web/Control.cs

@@ -1,3 +1,4 @@
+using System.Text;
 using System.Xml;
 using MBS.Web.UI;
 
@@ -13,6 +14,7 @@ public abstract class Control : IWebHandler
 	}
 
 	public Dictionary<string, string> PathVariables { get; } = new Dictionary<string, string>();
+	public Dictionary<string, string> StyleProperties { get; } = new Dictionary<string, string>();
     public bool Visible { get; set; } = true;
 
 	public Control(Dictionary<string, string>? pathVariables = null)
@@ -39,6 +41,12 @@ public abstract class Control : IWebHandler
 		return new string[0];
 	}
 
+	private IReadOnlyDictionary<string, string> _emptyStyleProperties = new Dictionary<string, string>();
+	protected virtual IReadOnlyDictionary<string, string> GetStyleProperties()
+	{
+		return _emptyStyleProperties;
+	}
+
 	private bool _initted = false;
 	protected void EnsureInitialized()
 	{
@@ -65,6 +73,8 @@ public abstract class Control : IWebHandler
 		writer.WriteStartElement(TagName);
 
 		bool classListWritten = false;
+		bool styleListWritten = false;
+
 		IDictionary<string, string> attrs = GetControlAttributes();
 		foreach (KeyValuePair<string, string> kvp in attrs)
 		{
@@ -76,6 +86,13 @@ public abstract class Control : IWebHandler
 				value = String.Join(' ', classList);
 				classListWritten = true;
 			}
+			else if (kvp.Key == "style")
+			{
+				// IDictionary<string, string> classList = GetStyleProperties().Union(kvp.Value.Split(new char[] { ';' }));
+
+				// value = String.Join(' ', classList);
+				// classListWritten = true;	
+			}
 			writer.WriteAttributeString(kvp.Key, value);
 		}
 
@@ -84,8 +101,28 @@ public abstract class Control : IWebHandler
 		{
 			writer.WriteAttributeString("class", String.Join(' ', actualClassList));
 		}
+
+		IEnumerable<KeyValuePair<string, string>> actualStyleProperties = GetStyleProperties().Union(StyleProperties);
+		if (!styleListWritten && actualStyleProperties.Count() > 0)
+		{
+			writer.WriteAttributeString("style", RenderStyleProperties(actualStyleProperties));
+		}
 	}
-	protected virtual void RenderEndTag(XmlWriter writer)
+
+    private string RenderStyleProperties(IEnumerable<KeyValuePair<string, string>> actualStyleProperties)
+    {
+		StringBuilder sb = new StringBuilder();
+		foreach (KeyValuePair<string, string> kvp in actualStyleProperties)
+		{
+			sb.Append(kvp.Key);
+			sb.Append(':');
+			sb.Append(kvp.Value);
+			sb.Append(';');
+		}
+		return sb.ToString();
+    }
+
+    protected virtual void RenderEndTag(XmlWriter writer)
 	{
 		writer.WriteEndElement();
 	}

src/lib/MBS.Web/UI/WebControls/ListView.cs

@@ -113,6 +113,18 @@ public class ListView : Container
 
 	private HtmlGenericControl thead = null, tbody = null;
 
+    protected override IEnumerable<string> GetStyleClasses()
+    {
+        return [ "uwt-listview" ];
+    }
+    protected override IReadOnlyDictionary<string, string> GetStyleProperties()
+    {
+		return new Dictionary<string, string>(new KeyValuePair<string, string>[]
+		{
+			new KeyValuePair<string, string>("height", "300px")
+		});
+    }
+
     protected override IList<Control> GetChildControls()
     {
 		thead = new HtmlGenericControl("thead");
@@ -127,6 +139,10 @@ public class ListView : Container
 		thead.Controls.Add(tr);
 
 		tbody = new HtmlGenericControl("tbody");
+		tbody.StyleProperties["height"] = "500px";
+		tbody.StyleProperties["overflow"] = "scroll";
+		tbody.StyleProperties["display"] = "block";
+		
 		foreach (ListViewItem lvi in Items)
 		{
 			HtmlGenericControl tr2 = new HtmlGenericControl("tr");