Codegasm Episode # 5 Project

This is the sample web browser project that goes with Codegasm Episode 5
at http://barnnerd.com

Test App 5 - Simple Web Browser/App.config

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+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
+    </startup>
+</configuration>

Test App 5 - Simple Web Browser/Form1.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Data;
+using System.Drawing;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+using System.Threading;
+using System.Net;
+using System.IO;
+
+namespace SimpleWebBrowser
+{
+    public partial class Form1 : Form
+    {
+        public Form1()
+        {
+            InitializeComponent();
+        }
+
+        /// <summary>
+        /// This will close the application when the File->Exit menu item is selected
+        /// </summary>
+        /// <param name="sender"></param>
+        /// <param name="e"></param>
+        private void exitToolStripMenuItem_Click(object sender, EventArgs e)
+        {
+            this.Close();
+        }
+
+        /// <summary>
+        /// This will show a box with the author information when the about menu item is selected
+        /// </summary>
+        /// <param name="sender"></param>
+        /// <param name="e"></param>
+        private void aboutToolStripMenuItem_Click(object sender, EventArgs e)
+        {
+            MessageBox.Show("This program was made by Jerry (aka. Barnacules)");
+        }
+
+        /// <summary>
+        /// On click of this button the web control will display the page requested in the text box (by url)
+        /// </summary>
+        /// <param name="sender"></param>
+        /// <param name="e"></param>
+        private void button1_Click(object sender, EventArgs e)
+        {
+            NavigateToPage();
+        }
+
+        /// <summary>
+        /// This function will cause the browser to navigate to the URL in the textBox1 control
+        /// </summary>
+        private void NavigateToPage()
+        {
+            toolStripStatusLabel1.Text = "Navigation has started";
+            webBrowser1.Navigate(textBox1.Text);
+        }
+
+        /// <summary>
+        /// This function will start navigation by simulating a click on the navigate button when 'enter' is pressed when textbox1 is in focus
+        /// </summary>
+        /// <param name="sender"></param>
+        /// <param name="e"></param>
+        private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
+        {
+            // if the keystroke was enter then do something
+            if( e.KeyChar == (char)ConsoleKey.Enter )
+            {
+                //NavigateToPage();
+                button1_Click(null, null);
+            }
+        }
+
+        /// <summary>
+        /// When the webpage is finished loading this function will re-enable the disabled controls and indicate success
+        /// </summary>
+        /// <param name="sender"></param>
+        /// <param name="e"></param>
+        private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
+        {
+            // Enable the controls that were disabled during navigation
+            button1.Enabled = true;
+            textBox1.Enabled = true;
+
+            // Indicate loading is complete
+            toolStripStatusLabel1.Text = "Navigation Complete";
+            toolStripProgressBar1.ProgressBar.Value = 100;
+        }
+
+        /// <summary>
+        /// This function will be called as the webpage loads multiple time to indicate the percentage complete
+        /// </summary>
+        /// <param name="sender"></param>
+        /// <param name="e"></param>
+        private void webBrowser1_ProgressChanged(object sender, WebBrowserProgressChangedEventArgs e)
+        {
+            // Don't bother computing percentage if either variable is zero since it will cause a divide by zero error
+            if (e.CurrentProgress > 0 && e.MaximumProgress > 0)
+            {
+                // Calculate percentage
+                int percentage =  (int)(e.CurrentProgress * 100 / e.MaximumProgress);
+
+                // If the percentage is > 100 it means additional processing was done on the page so we want to ignore it
+                if( percentage <= 100)
+                {
+                    toolStripProgressBar1.ProgressBar.Value = percentage;
+                }
+            }
+            else
+            {
+                // Set the percentage to zero if we can't compute it
+                toolStripProgressBar1.ProgressBar.Value = 0;
+            }
+        }
+
+        /// <summary>
+        /// When the 'Swap Stuff Out' button is pressed on the menu bar this will swap out all of the images on the website with a funny cat picture
+        /// </summary>
+        /// <param name="sender"></param>
+        /// <param name="e"></param>
+        private void swapOutStuffToolStripMenuItem_Click(object sender, EventArgs e)
+        {
+            foreach (HtmlElement image in webBrowser1.Document.Images)
+            {
+                // Replace all the <img src=""> values with our funny cat picture
+                if (image.GetAttribute("src") != "http://evelyngarone.files.wordpress.com/2012/01/little-cat.jpg")
+                {
+                    image.SetAttribute("src", "http://evelyngarone.files.wordpress.com/2012/01/little-cat.jpg");
+                }
+            }
+        }
+    }
+}