VAR.WebFormsCore: Implement Postback handling, for buttons, textbox and hidden fields.

VAR.WebFormsCore/Controls/Button.cs

@@ -4,7 +4,7 @@ using System.IO;
 namespace VAR.WebFormsCore.Controls
 {
     // TODO: Implememnt control
-    public class Button : Control
+    public class Button : Control, IReceivePostbackEvent
     {
         public Button()
         {
@@ -28,5 +28,10 @@ namespace VAR.WebFormsCore.Controls
 
             textWriter.Write("</input>");
         }
+
+        public void ReceivePostBack()
+        {
+            Click?.Invoke(this, null);
+        }
     }
 }

VAR.WebFormsCore/Controls/CTextBox.cs

@@ -141,12 +141,6 @@ namespace VAR.WebFormsCore.Controls
                     "if(event.keyCode==13){{document.getElementById('{0}').focus(); return false;}}",
                     _nextFocusOnEnter.ClientID));
             }
-
-            // FIX: The framework deletes textbox values on password mode
-            if (_txtContent.TextMode == TextBoxMode.Password)
-            {
-                _txtContent.Attributes["value"] = _txtContent.Text;
-            }
         }
 
         #endregion Control life cycle

VAR.WebFormsCore/Controls/Control.cs

@@ -34,8 +34,11 @@ namespace VAR.WebFormsCore.Controls
 
         public event EventHandler Load;
 
+        protected virtual void Process() { }
+
         protected void OnLoad()
         {
+            Process();
             Load?.Invoke(this, null);
             foreach (Control control in Controls)
             {
@@ -172,9 +175,9 @@ namespace VAR.WebFormsCore.Controls
             textWriter.Write(" {0}=\"{1}\"", key, value);
         }
 
-        protected void RenderAttributes(TextWriter textWriter)
+        protected void RenderAttributes(TextWriter textWriter, bool forceId = false)
         {
-            if (string.IsNullOrEmpty(_id) == false)
+            if (string.IsNullOrEmpty(_id) == false || forceId)
             {
                 RenderAttribute(textWriter, "id", ClientID);
                 RenderAttribute(textWriter, "name", ClientID);
@@ -198,5 +201,21 @@ namespace VAR.WebFormsCore.Controls
             }
         }
 
+        public List<Control> ChildsOfType<T>(List<Control> controls = null)
+        {
+            if (controls == null)
+            {
+                controls = new List<Control>();
+            }
+
+            if (this is T) { controls.Add(this); }
+
+            foreach (Control child in _controls)
+            {
+                child.ChildsOfType<T>(controls);
+            }
+            return controls;
+        }
+
     }
 }

VAR.WebFormsCore/Controls/HiddenField.cs

@@ -6,10 +6,19 @@ namespace VAR.WebFormsCore.Controls
     public class HiddenField : Control
     {
         public string Value { get; set; }
+
+        protected override void Process()
+        {
+            if (Page.IsPostBack && Page.Context.Request.Form.ContainsKey(ClientID))
+            {
+                Value = Page.Context.Request.Form[ClientID];
+            }
+        }
+
         public override void Render(TextWriter textWriter)
         {
             textWriter.Write("<input type=\"hidden\" ");
-            RenderAttributes(textWriter);
+            RenderAttributes(textWriter, forceId: true);
             if (string.IsNullOrEmpty(Value) == false)
             {
                 textWriter.Write(" value=\"{0}\"", Value);

VAR.WebFormsCore/Controls/HtmlForm.cs

@@ -1,8 +1,25 @@
-namespace VAR.WebFormsCore.Controls
+using System.IO;
+
+namespace VAR.WebFormsCore.Controls
 {
     // TODO: Implment this control
-    public class HtmlForm : HtmlGenericControl
+    public class HtmlForm : Control
     {
-        public HtmlForm() : base("form") { }
+        private string _method = "post";
+
+        public HtmlForm() { }
+
+        public override void Render(TextWriter textWriter)
+        {
+            textWriter.Write("<form ");
+            RenderAttributes(textWriter);
+            RenderAttribute(textWriter, "method", _method);
+            RenderAttribute(textWriter, "action", Page.GetType().Name);
+            textWriter.Write(">");
+
+            base.Render(textWriter);
+
+            textWriter.Write("</form>");
+        }
     }
 }

VAR.WebFormsCore/Controls/IReceivePostbackEvent.cs

@@ -0,0 +1,7 @@
+namespace VAR.WebFormsCore.Controls
+{
+    public interface IReceivePostbackEvent
+    {
+        void ReceivePostBack();
+    }
+}

VAR.WebFormsCore/Controls/Panel.cs

@@ -1,7 +1,7 @@
 namespace VAR.WebFormsCore.Controls
 {
     // TODO: Implememnt control
-    public class Panel : HtmlGenericControl
+    public class Panel : HtmlGenericControl, INamingContainer
     {
         public Panel() : base("div") { }
     }

VAR.WebFormsCore/Controls/TextBox.cs

@@ -9,12 +9,20 @@ namespace VAR.WebFormsCore.Controls
 
         public TextBoxMode TextMode { get; set; } = TextBoxMode.Normal;
 
+        protected override void Process()
+        {
+            if (Page.IsPostBack && Page.Context.Request.Form.ContainsKey(ClientID))
+            {
+                Text = Page.Context.Request.Form[ClientID];
+            }
+        }
+
         public override void Render(TextWriter textWriter)
         {
             if (TextMode == TextBoxMode.MultiLine)
             {
                 textWriter.Write("<textare ");
-                RenderAttributes(textWriter);
+                RenderAttributes(textWriter, forceId: true);
                 textWriter.Write(">");
                 textWriter.Write(Text);
                 textWriter.Write("</textare>");
@@ -22,7 +30,7 @@ namespace VAR.WebFormsCore.Controls
             else if (TextMode == TextBoxMode.Normal)
             {
                 textWriter.Write("<input type=\"text\" ");
-                RenderAttributes(textWriter);
+                RenderAttributes(textWriter, forceId: true);
                 if (string.IsNullOrEmpty(Text) == false)
                 {
                     RenderAttribute(textWriter, "value", Text);
@@ -33,7 +41,7 @@ namespace VAR.WebFormsCore.Controls
             else if (TextMode == TextBoxMode.Password)
             {
                 textWriter.Write("<input type=\"password\" ");
-                RenderAttributes(textWriter);
+                RenderAttributes(textWriter, forceId: true);
                 if (string.IsNullOrEmpty(Text) == false)
                 {
                     RenderAttribute(textWriter, "value", Text);

VAR.WebFormsCore/Pages/Page.cs

@@ -1,4 +1,5 @@
-using System.IO;
+using System.Collections.Generic;
+using System.IO;
 using Microsoft.AspNetCore.Http;
 using VAR.WebFormsCore.Code;
 using VAR.WebFormsCore.Controls;
@@ -19,16 +20,36 @@ namespace VAR.WebFormsCore.Pages
             Context = context;
             Page = this;
 
+            if (context.Request.Method == "POST")
+            {
+                _isPostBack = true;
+            }
+
             OnPreInit();
             OnInit();
             OnLoad();
-            OnPreRender();
 
+            if (_isPostBack)
+            {
+                List<Control> controls = ChildsOfType<IReceivePostbackEvent>();
+                foreach (Control control in controls)
+                {
+                    string clientID = control.ClientID;
+                    if (context.Request.Form.ContainsKey(clientID))
+                    {
+                        (control as IReceivePostbackEvent).ReceivePostBack();
+                    }
+                }
+            }
+
+            OnPreRender();
             Render(stringWriter);
             context.Response.Headers.Add("Content-Type", "text/html");
             Context.Response.WriteAsync(stringWriter.ToString());
         }
 
-        public bool IsPostBack { get; }
+        private bool _isPostBack = false;
+
+        public bool IsPostBack { get { return _isPostBack; } }
     }
 }