Customer ToolTip Class
using System;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;
/// <summary>
/// A custom tooltip class which adds some things I would like to see. I originally wrote this to have access to the
/// tooltip text.
/// </summary>
public class CustomToolTip : ToolTip
{
private readonly float[] _GradientPositions;
private readonly ColorBlend gradientBlender;
private Color _gradientEndColor = Color.DeepSkyBlue;
private Color _gradientMiddleColor = Color.LightSkyBlue;
private Color _gradientStartColor = Color.LightSkyBlue;
public CustomToolTip()
{
Font = new Font("Arial Narrow", 9.75F, FontStyle.Bold, GraphicsUnit.Point, 0);
_GradientPositions = new float[3];
_GradientPositions[0] = 0f;
_GradientPositions[1] = .3f;
_GradientPositions[2] = 1f;
gradientBlender = new ColorBlend(3) {Positions = _GradientPositions};
gradientBlender.Colors[0] = _gradientStartColor;
gradientBlender.Colors[1] = _gradientMiddleColor;
gradientBlender.Colors[2] = _gradientEndColor;
OwnerDraw = true;
Popup += OnPopup;
Draw += OnDraw;
}
/// <summary>
/// The font used in the drawing of the text.
/// </summary>
[Description("The font used in the drawing of the text.")]
public Font Font
{
get;
set;
}
/// <summary>
/// The background image used in the control.
/// </summary>
[Description("The background image used in the control.")]
public Image BackgroundImage
{
get;
set;
}
/// <summary>
/// Sets the color of the border
/// </summary>
[Description("Sets the color of the border")]
public Color BorderColor
{
get;
set;
} = Color.DodgerBlue;
/// <summary>
/// Enables or disables the drawing of the border
/// </summary>
[Description("Enables or disables the drawing of the border")]
public bool EnableBorder
{
get;
set;
} = true;
/// <summary>
/// Enables or disables the drawing of the Gradient Background
/// </summary>
[Description("Enables or disables the drawing of the Gradient Background")]
public bool EnableGradientBackground
{
get;
set;
} = false;
public string Text
{
get;
set;
} = "";
/// <summary>
/// Sets the direction of the gradient
/// </summary>
[Description("Sets the direction of the gradient")]
public LinearGradientMode GradientMode
{
get;
set;
} = LinearGradientMode.Vertical;
/// <summary>
/// Sets the color of the start of the gradient
/// </summary>
[Description("Sets the color of the start of the gradient")]
public Color GradientStartColor
{
get => _gradientStartColor;
set
{
_gradientStartColor = value;
gradientBlender.Colors[0] = _gradientStartColor;
}
}
/// <summary>
/// Sets the color of the middle of the gradient
/// </summary>
[Description("Sets the color of the middle of the gradient")]
public Color GradientMiddleColor
{
get => _gradientMiddleColor;
set
{
_gradientMiddleColor = value;
gradientBlender.Colors[1] = _gradientMiddleColor;
}
}
/// <summary>
/// Sets the color of the end of the gradient
/// </summary>
[Description("Sets the color of the end of the gradient")]
public Color GradientEndColor
{
get => _gradientEndColor;
set
{
_gradientEndColor = value;
gradientBlender.Colors[2] = _gradientEndColor;
}
}
/// <summary>
/// Set or Get the lower,center,upper bounds for the gradient brush
/// </summary>
[Category("Behavior")]
[Description("Set or Get the lower,center,upper bounds for the gradient brush")]
public float[] GradientPositions
{
get => _GradientPositions;
set
{
_GradientPositions[0] = value[0];
_GradientPositions[1] = value[1];
_GradientPositions[2] = value[2];
gradientBlender.Positions = _GradientPositions;
}
}
private void OnPopup(object sender, PopupEventArgs e)
{
var tt = GetToolTip(e.AssociatedControl);
var newstr = tt.Replace(@"\n", Environment.NewLine);
e.ToolTipSize = newstr.MeasureText(Font, 1, 1);
}
private void OnDraw(object sender, DrawToolTipEventArgs e)
{
var fs = Font.GetFontSize();
var g = e.Graphics;
g.CompositingQuality = CompositingQuality.HighQuality;
g.InterpolationMode = InterpolationMode.High;
Text = e.ToolTipText;
var newstr = e.ToolTipText.Replace(@"\n", Environment.NewLine);
if (BackgroundImage == null)
if (EnableGradientBackground)
{
var b = new LinearGradientBrush(e.Bounds, Color.Black, Color.Black, GradientMode) {InterpolationColors = gradientBlender};
g.FillRectangle(b, e.Bounds);
}
else
{
g.FillRectangle(new SolidBrush(BackColor), new Rectangle(e.Bounds.X, e.Bounds.Y, e.Bounds.Width, e.Bounds.Height));
}
else
g.DrawImage(new Bitmap(BackgroundImage, e.Bounds.Width, e.Bounds.Height), new Rectangle(e.Bounds.X, e.Bounds.Y, e.Bounds.Width, e.Bounds.Height));
g.DrawString(newstr, Font, new SolidBrush(ForeColor), new PointF(e.Bounds.X + fs.Width / 2, e.Bounds.Y + fs.Height / 2));
if (EnableBorder)
g.DrawRectangle(new Pen(new SolidBrush(BorderColor), 1), new Rectangle(e.Bounds.X, e.Bounds.Y, e.Bounds.Width - 1, e.Bounds.Height - 1));
}
}