BrolBoxUserControl.cs

using System;
using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;
using be.gaudry.view.style;
 
namespace be.gaudry.view.controls
{
    [
    Docking(DockingBehavior.Ask),
    ToolboxBitmap(@"BrolBoxUserControl.displayMenuTop")
    ]
    public partial class BrolBoxUserControl : UserControl
    {
        #region declarations constructors and destructors
 
        private EventHandler rendererChangedEvent;
        private bool useContentGradient, useCaptionGradient;
        private System.Drawing.Drawing2D.LinearGradientBrush gradientBrush;
 
        public BrolBoxUserControl()
        {
            useContentGradient = true;
            useCaptionGradient = true;
            rendererChangedEvent = new EventHandler(onRendererChanged);
            InitializeComponent(); this.SetStyle(ControlStyles.ResizeRedraw, true);
            this.SetStyle(ControlStyles.UserPaint, true);
            this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
            this.SetStyle(ControlStyles.DoubleBuffer, true);
            StyleFactory.Instance.onRendererChanged += rendererChangedEvent;
            initGradientBackground();
        }
        ~BrolBoxUserControl()
        {
            StyleFactory.Instance.onRendererChanged -= rendererChangedEvent;
            Dispose(false);
        } 
        #endregion
 
        #region properties
        [
        Description("Enable/Disable using gradient colors for the content. False to use control color."),
        Category("BrolBox features"),
        DefaultValue(true),
        Browsable(true)
        ]
        public bool UseContentGradient
        {
            get
            {
                return useContentGradient;
            }
            set
            {
                useContentGradient = value;
                initGradientBackground();
            }
        }
        [
        Description("Enable/Disable using gradient colors for the content. False to use control color."),
        Category("BrolBox features"),
        DefaultValue(true),
        Browsable(true)
        ]
        public bool UseCaptionGradient
        {
            get
            {
                return useCaptionGradient;
            }
            set
            {
                useCaptionGradient = value;
                initGradientBackground();
            }
        }
 
        [
        Description("Change the caption text to be displayed"),
        Category("BrolBox features"),
        DefaultValue(""),
        Browsable(true)
        ]
        public String CaptionText
        {
            get
            {
                return captionLbl.Text;
            }
            set
            {
                captionLbl.Text = value;
                Invalidate();
            }
        }
        [
        Description("Change the icon to display in the title"),
        Category("BrolBox features"),
        DefaultValue(null),
        Browsable(true)
        ]
        public Image CaptionImage
        {
            get
            {
                return captionPB.Image; 
            }
            set
            {
                captionPB.Image = value;
                Invalidate();
            }
        }
 
        #endregion
 
        /// <summary>
        /// Defines a bitmap as BackgroundImageLayout to avoid gradient background flickering 
        /// on paint event
        /// </summary>
        private void initGradientBackground()
        {
            /*gradientBrush = new System.Drawing.Drawing2D.LinearGradientBrush(new
                Point(0, 0),
                new Point(captionPanel.Width, captionPanel.Height),
                StyleFactory.CustomSystemColors.ActiveCaption,
                StyleFactory.CustomSystemColors.GradientActiveCaption
                );*/
            gradientBrush = new System.Drawing.Drawing2D.LinearGradientBrush(
                new Rectangle(0, 0, captionPanel.Width, captionPanel.Height),
                StyleFactory.CustomSystemColors.ActiveCaption,
                StyleFactory.CustomSystemColors.GradientActiveCaption, 
                System.Drawing.Drawing2D.LinearGradientMode.ForwardDiagonal
                );
            Bitmap bmp = new Bitmap(captionPanel.Width, captionPanel.Height);
            Graphics g = Graphics.FromImage(bmp);
            g.FillRectangle(gradientBrush, new Rectangle(0, 0, captionPanel.Width, captionPanel.Height));
            captionPanel.BackgroundImage = bmp;
            captionPanel.BackgroundImageLayout = ImageLayout.Stretch;
        }
 
        private void onRendererChanged(object sender, EventArgs e)
        {
            initGradientBackground();
        }
    }
}