Exemple d’utilisation du Panel ‘Gradient’

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Drawing2D;
using System.Drawing.Design;
namespace Composant
{
    public class ExempleGradientPanel : Form
    {
        private GradientPanel gradientPanel1;
        private System.Windows.Forms.Label lbl2;
        private System.Windows.Forms.Button btn;
        private System.Windows.Forms.Label lbl3;
        private System.Windows.Forms.Label lbl1;
        public ExempleGradientPanel()
        {
            InitializeComponent();
        }
 
        private void InitializeComponent()
        {
            this.gradientPanel1 = new Composant.GradientPanel();
            this.lbl2 = new System.Windows.Forms.Label();
            this.btn = new System.Windows.Forms.Button();
            this.lbl3 = new System.Windows.Forms.Label();
            this.lbl1 = 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.lbl2);
            this.gradientPanel1.Controls.Add(this.btn);
            this.gradientPanel1.Controls.Add(this.lbl3);
            this.gradientPanel1.Controls.Add(this.lbl1);
            this.gradientPanel1.Location = new System.Drawing.Point(-3, -2);
            this.gradientPanel1.Name = "gradientPanel1";
            this.gradientPanel1.Size = new System.Drawing.Size(438, 260);
            this.gradientPanel1.TabIndex = 1;
            //
            // lbl2
            //
            this.lbl2.BackColor = System.Drawing.Color.Transparent;
            this.lbl2.Font = new System.Drawing.Font("Tahoma", 9.75F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.lbl2.ForeColor = System.Drawing.Color.White;
            this.lbl2.Location = new System.Drawing.Point(144, 59);
            this.lbl2.Name = "lbl2";
            this.lbl2.Size = new System.Drawing.Size(100, 39);
            this.lbl2.TabIndex = 2;
            this.lbl2.Text = "text.";
            //
            // btn
            //
            this.btn.Location = new System.Drawing.Point(205, 205);
            this.btn.Name = "btn";
            this.btn.Size = new System.Drawing.Size(75, 23);
            this.btn.TabIndex = 1;
            this.btn.Text = "Test Bouton";
            //
            // lbl3
            //
            this.lbl3.AutoSize = true;
            this.lbl3.BackColor = System.Drawing.Color.Transparent;
            this.lbl3.Font = new System.Drawing.Font("Microsoft Sans Serif", 24F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.lbl3.ForeColor = System.Drawing.Color.White;
            this.lbl3.Location = new System.Drawing.Point(66, 194);
            this.lbl3.Name = "lbl3";
            this.lbl3.Size = new System.Drawing.Size(129, 37);
            this.lbl3.TabIndex = 1;
            this.lbl3.Text = "Label 2";
            this.lbl3.Click += new System.EventHandler(this.label2_Click);
            //
            // lbl1
            //
            this.lbl1.AutoSize = true;
            this.lbl1.BackColor = System.Drawing.Color.Transparent;
            this.lbl1.Font = new System.Drawing.Font("Microsoft Sans Serif", 24F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.lbl1.ForeColor = System.Drawing.Color.White;
            this.lbl1.Location = new System.Drawing.Point(-7, 4);
            this.lbl1.Name = "lbl1";
            this.lbl1.Size = new System.Drawing.Size(415, 37);
            this.lbl1.TabIndex = 0;
            this.lbl1.Text = "Exemple Texte Trasparent";
            //
            // ExempleGradientPanel
            //
            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 = "ExempleGradientPanel";
            this.Text = "GradientPanel";
            this.gradientPanel1.ResumeLayout(false);
            this.gradientPanel1.PerformLayout();
            this.ResumeLayout(false);
 
        }
 
        /*[STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.Run(new ExempleGradientPanel());
        }*/
 
        private void label2_Click(object sender, EventArgs e)
        {
 
        }
 
    }
 
    public class GradientPanel : Panel
    {
        private Color couleur1 = Color.YellowGreen;
        private Color couleur2 = 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, couleur1, couleur2, 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();
        }
 
    }
 
}