Csharp/C Sharp/Components/Gradient Panel

Gradient Panel Demo

using System;
using System.Collections.Generic;
using System.ruponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Drawing2D;
using System.Drawing.Design;
public class Form1 : Form
{
        private GradientPanel gradientPanel1;
        private System.Windows.Forms.Label label3;
        private System.Windows.Forms.Button button1;
        private System.Windows.Forms.Label label2;
        private System.Windows.Forms.Label label1;
      public Form1() {
            InitializeComponent();
      }
        private void InitializeComponent()
        {
            this.gradientPanel1 = new GradientPanel();
            this.label3 = new System.Windows.Forms.Label();
            this.button1 = new System.Windows.Forms.Button();
            this.label2 = new System.Windows.Forms.Label();
            this.label1 = new System.Windows.Forms.Label();
            this.gradientPanel1.SuspendLayout();
            this.SuspendLayout();
            // 
            // gradientPanel1
            // 
            this.gradientPanel1.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
                        | System.Windows.Forms.AnchorStyles.Left)
                        | System.Windows.Forms.AnchorStyles.Right)));
            this.gradientPanel1.AutoScroll = true;
            this.gradientPanel1.Controls.Add(this.label3);
            this.gradientPanel1.Controls.Add(this.button1);
            this.gradientPanel1.Controls.Add(this.label2);
            this.gradientPanel1.Controls.Add(this.label1);
            
            this.gradientPanel1.Location = new System.Drawing.Point(4, 6);
            this.gradientPanel1.Name = "gradientPanel1";
            this.gradientPanel1.Size = new System.Drawing.Size(427, 190);
            this.gradientPanel1.TabIndex = 1;
            // 
            // label3
            // 
            this.label3.BackColor = System.Drawing.Color.Transparent;
            this.label3.Font = new System.Drawing.Font("Tahoma", 9.75F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.label3.ForeColor = System.Drawing.Color.White;
            this.label3.Location = new System.Drawing.Point(18, 57);
            this.label3.Name = "label3";
            this.label3.Size = new System.Drawing.Size(328, 39);
            this.label3.TabIndex = 2;
            this.label3.Text = "text." +
                "";
            // 
            // button1
            // 
            this.button1.Location = new System.Drawing.Point(231, 109);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(75, 23);
            this.button1.TabIndex = 1;
            this.button1.Text = "Test Button";
            // 
            // label2
            // 
            this.label2.AutoSize = true;
            this.label2.BackColor = System.Drawing.Color.Transparent;
            this.label2.Font = new System.Drawing.Font("Microsoft Sans Serif", 24F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.label2.ForeColor = System.Drawing.Color.White;
            this.label2.Location = new System.Drawing.Point(40, 226);
            this.label2.Name = "label2";
            this.label2.Size = new System.Drawing.Size(108, 37);
            this.label2.TabIndex = 1;
            this.label2.Text = "label2";
            // 
            // label1
            // 
            this.label1.AutoSize = true;
            this.label1.BackColor = System.Drawing.Color.Transparent;
            this.label1.Font = new System.Drawing.Font("Microsoft Sans Serif", 24F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.label1.ForeColor = System.Drawing.Color.White;
            this.label1.Location = new System.Drawing.Point(17, 12);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(277, 37);
            this.label1.TabIndex = 0;
            this.label1.Text = "Transparent Text";
            // 
            // GradientPanelTest
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(435, 260);
            this.Controls.Add(this.gradientPanel1);
            this.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.Name = "GradientPanelTest";
            this.Text = "GradientPanel";
            this.gradientPanel1.ResumeLayout(false);
            this.gradientPanel1.PerformLayout();
            this.ResumeLayout(false);
        }
  [STAThread]
  static void Main()
  {
    Application.EnableVisualStyles();
    Application.Run(new Form1());
  }
}
  public class GradientPanel : Panel
  {  
        private Color ColorA = Color.LightBlue;
        private Color ColorB = Color.Red;
        private LinearGradientMode GradientFillStyle = LinearGradientMode.ForwardDiagonal;
        private Brush gradientBrush;
        public GradientPanel()
        {
            handlerGradientChanged = new EventHandler(GradientChanged);
            ResizeRedraw = true;
        }
        private EventHandler handlerGradientChanged;

    protected override void OnPaintBackground( System.Windows.Forms.PaintEventArgs e)
        {       
            gradientBrush = new LinearGradientBrush(ClientRectangle, ColorA, ColorB, GradientFillStyle);
      e.Graphics.FillRectangle(gradientBrush, ClientRectangle);
        }
        protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                if (gradientBrush != null) gradientBrush.Dispose();
            }
            base.Dispose(disposing);
        }
        protected override void OnScroll(ScrollEventArgs se)
        {
            Invalidate();
        }
    
        private void GradientChanged(object sender, EventArgs e)
    {
            if (gradientBrush != null) gradientBrush.Dispose();
            gradientBrush = null;
      Invalidate();
    }
  }