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Host application for the GraphicsDLL and the Shell Extension article.

using System;

using System.Drawing;

using System.Collections;

using System.ComponentModel;

using System.Windows.Forms;

using System.Data;

using WellFormed;

namespace HostApplication

{

/// <summary>

/// Summary description for Form1.

/// </summary>

public class Form1 : System.Windows.Forms.Form

{

private System.Windows.Forms.Button button1;

private System.Windows.Forms.ComboBox comboBox1;

private System.Windows.Forms.ComboBox comboBox2;

private System.Windows.Forms.Panel panel1;

/// <summary>

/// Required designer variable.

/// </summary>

private System.ComponentModel.Container components = null;

WellFormed.ColorShape _colorShape=new ColorShape();

public Form1()

{

// Required for Windows Form Designer support

InitializeComponent();

_colorShape.Color=Color.Red;

_colorShape.Shape=ColorShape.Shapes.Cross;

this.comboBox1.SelectedIndexChanged+=new EventHandler(comboBox1_SelectedIndexChanged);

this.comboBox2.SelectedIndexChanged+=new EventHandler(comboBox2_SelectedIndexChanged);

}

/// <summary>

/// Clean up any resources being used.

/// </summary>

protected override void Dispose( bool disposing )

{

if( disposing )

{

if (components != null)

{

components.Dispose();

}

base.Dispose( disposing );

}

#region Windows Form Designer generated code

/// <summary>

/// Required method for Designer support - do not modify

/// the contents of this method with the code editor.

/// </summary>

private void InitializeComponent()

{

this.button1 = new System.Windows.Forms.Button();

this.comboBox1 = new System.Windows.Forms.ComboBox();

this.comboBox2 = new System.Windows.Forms.ComboBox();

this.panel1 = new System.Windows.Forms.Panel();

this.SuspendLayout();

// button1

this.button1.Location = new System.Drawing.Point(200, 192);

this.button1.Name = "button1";

this.button1.TabIndex = 0;

this.button1.Text = "Save";

this.button1.Click += new System.EventHandler(this.button1_Click);

// comboBox1

this.comboBox1.Items.AddRange(new object[] {

"Red",

"Green",

"Blue"});

this.comboBox1.Location = new System.Drawing.Point(160, 48);

this.comboBox1.Name = "comboBox1";

this.comboBox1.Size = new System.Drawing.Size(121, 21);

this.comboBox1.TabIndex = 1;

this.comboBox1.Text = "Red";

// comboBox2

this.comboBox2.Items.AddRange(new object[] {

"Cross",

"Square",

"Circle"});

this.comboBox2.Location = new System.Drawing.Point(160, 80);

this.comboBox2.Name = "comboBox2";

this.comboBox2.Size = new System.Drawing.Size(121, 21);

this.comboBox2.TabIndex = 2;

this.comboBox2.Text = "Cross";

// panel1

this.panel1.Location = new System.Drawing.Point(8, 24);

this.panel1.Name = "panel1";

this.panel1.Size = new System.Drawing.Size(144, 144);

this.panel1.TabIndex = 3;

this.panel1.Paint += new System.Windows.Forms.PaintEventHandler(this.panel1_Paint);

// Form1

this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);

this.ClientSize = new System.Drawing.Size(292, 266);

this.Controls.Add(this.panel1);

this.Controls.Add(this.comboBox2);

this.Controls.Add(this.comboBox1);

this.Controls.Add(this.button1);

this.Name = "Form1";

this.Text = "Form1";

this.ResumeLayout(false);

}

#endregion

/// <summary>

/// The main entry point for the application.

/// </summary>

[STAThread]

static void Main()

{

Application.Run(new Form1());

}

private void panel1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)

{

_colorShape.Draw(e.Graphics,this.panel1.ClientRectangle);

}

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)

{

switch(this.comboBox1.Text)

{

case "Red":

_colorShape.Color=Color.Red;

break;

case "Green":

_colorShape.Color=Color.Green;

break;

case "Blue":

_colorShape.Color=Color.Blue;

break;

}

this.panel1.Invalidate();

}

private void comboBox2_SelectedIndexChanged(object sender, EventArgs e)

{

switch(this.comboBox2.Text)

{

case "Cross":

_colorShape.Shape=ColorShape.Shapes.Cross;

break;

case "Circle":

_colorShape.Shape=ColorShape.Shapes.Circle;

break;

case "Square":

_colorShape.Shape=ColorShape.Shapes.Square;

break;

}

this.panel1.Invalidate();

}

private void button1_Click(object sender, System.EventArgs e)

{

SaveFileDialog dlg=new SaveFileDialog();

dlg.AddExtension=true;

dlg.DefaultExt=".wff";

dlg.Filter="Well Formed Files (*.wff)|*.wff";

if(dlg.ShowDialog()==DialogResult.OK)

{

_colorShape.Save(dlg.FileName);

}

private void button2_Click(object sender, System.EventArgs e)

{

OpenFileDialog dlg=new OpenFileDialog();

dlg.Filter="Well Formed Files (*.wff)|*.wff";

if(dlg.ShowDialog()==DialogResult.OK)

{

this._colorShape=ColorShape.Load(dlg.FileName);

this.panel1.Invalidate();

}

The application looks like this when running.

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