DotNet 4.8.1 build of DotNetBar

PROMS/DotNetBar Source Code/AdvTree/Drawing/GradientFill.cs

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+using System;
+using System.Text;
+using System.Drawing;
+using System.ComponentModel;
+using System.Drawing.Drawing2D;
+
+namespace DevComponents.WinForms.Drawing
+{
+    public class GradientFill : Fill
+    {
+        #region Constructor
+        /// <summary>
+        /// Initializes a new instance of the GradientFill class.
+        /// </summary>
+        public GradientFill()
+        {
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the GradientFill class.
+        /// </summary>
+        /// <param name="color1"></param>
+        /// <param name="color2"></param>
+        public GradientFill(Color color1, Color color2)
+        {
+            _Color1 = color1;
+            _Color2 = color2;
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the GradientFill class.
+        /// </summary>
+        /// <param name="color1"></param>
+        /// <param name="color2"></param>
+        /// <param name="angle"></param>
+        public GradientFill(Color color1, Color color2, float angle)
+        {
+            _Color1 = color1;
+            _Color2 = color2;
+            _Angle = angle;
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the GradientFill class.
+        /// </summary>
+        /// <param name="interpolationColors"></param>
+        public GradientFill(ColorStop[] interpolationColors)
+        {
+            _InterpolationColors.AddRange(interpolationColors);
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the GradientFill class.
+        /// </summary>
+        /// <param name="interpolationColors"></param>
+        public GradientFill(ColorStop[] interpolationColors, int angle)
+        {
+            _InterpolationColors.AddRange(interpolationColors);
+            _Angle = angle;
+        }
+        #endregion
+
+        #region Internal Implementation
+        /// <summary>
+        /// Creates the brush for fill.
+        /// </summary>
+        /// <param name="bounds">Bounds for the brush</param>
+        /// <returns>Returns brush or null if brush cannot be created for given bounds or colors are not set. It is responsibility of caller to Dispose the brush.</returns>
+        public override Brush CreateBrush(Rectangle bounds)
+        {
+            if (_Color1.IsEmpty && _Color2.IsEmpty && _InterpolationColors.Count == 0 || bounds.Width < 1 || bounds.Height < 1) return null;
+
+            LinearGradientBrush brush=new LinearGradientBrush(bounds, _Color1, _Color2, _Angle);
+            if (_InterpolationColors.Count == 0)
+                return brush;
+            brush.InterpolationColors = _InterpolationColors.GetColorBlend();
+
+            return brush;
+        }
+
+        private Color _Color1 = Color.Empty;
+        /// <summary>
+        /// Gets or sets the starting gradient fill color.
+        /// </summary>
+        [Description("Indicates the fill color.")]
+        public Color Color1
+        {
+            get { return _Color1; }
+            set { _Color1 = value; }
+        }
+        /// <summary>
+        /// Gets whether property should be serialized.
+        /// </summary>
+        /// <returns>true if property should be serialized</returns>
+        [EditorBrowsable(EditorBrowsableState.Never)]
+        public bool ShouldSerializeColor1()
+        {
+            return !_Color1.IsEmpty;
+        }
+        /// <summary>
+        /// Sets the property to its default value.
+        /// </summary>
+        [EditorBrowsable(EditorBrowsableState.Never)]
+        public void ResetColor1()
+        {
+            Color1 = Color.Empty;
+        }
+
+        private Color _Color2 = Color.Empty;
+        /// <summary>
+        /// Gets or sets the end gradient fill color.
+        /// </summary>
+        [Description("Indicates the fill color.")]
+        public Color Color2
+        {
+            get { return _Color2; }
+            set { _Color2 = value; }
+        }
+        /// <summary>
+        /// Gets whether property should be serialized.
+        /// </summary>
+        /// <returns>true if property should be serialized</returns>
+        [EditorBrowsable(EditorBrowsableState.Never)]
+        public bool ShouldSerializeColor2()
+        {
+            return !_Color2.IsEmpty;
+        }
+        /// <summary>
+        /// Sets the property to its default value.
+        /// </summary>
+        [EditorBrowsable(EditorBrowsableState.Never)]
+        public void ResetColor2()
+        {
+            Color2 = Color.Empty;
+        }
+
+        private ColorBlendCollection _InterpolationColors = new ColorBlendCollection();
+        /// <summary>
+        /// Gets the collection that defines the multicolor gradient background.
+        /// </summary>
+        /// <remarks>
+        /// Setting this property creates a multicolor gradient with one color at each position along the gradient line. Setting this property nullifies all previous color, position, and falloff settings for this gradient fill.
+        /// </remarks>
+        [Browsable(true), DesignerSerializationVisibility(DesignerSerializationVisibility.Content), Description("Collection that defines the multicolor gradient background.")]
+        public ColorBlendCollection InterpolationColors
+        {
+            get { return _InterpolationColors; }
+        }
+
+        private float _Angle = 90;
+        /// <summary>
+        /// Gets or sets the gradient fill angle. Default value is 90.
+        /// </summary>
+        [DefaultValue(90), Description("Indicates gradient fill angle.")]
+        public float Angle
+        {
+            get { return _Angle; }
+            set
+            {
+                _Angle = value;
+            }
+        }
+        /// <summary>
+        /// Creates a pen based on fill parameters.
+        /// </summary>
+        /// <param name="width">Width of the pen to create</param>
+        /// <returns>new instance of pen or null if pen cannot be created.</returns>
+        public override Pen CreatePen(int width)
+        {
+            if (!_Color1.IsEmpty)
+                return new Pen(_Color1, width);
+            if (!_Color2.IsEmpty)
+                return new Pen(_Color2, width);
+            return null;
+        }
+        #endregion
+
+    }
+}