// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

using System.Drawing;

namespace System.Windows.Forms
{
    /// <summary>
    ///  This class contains the information a user needs to paint the ToolTip.
    /// </summary>
    public class DrawToolTipEventArgs : EventArgs
    {
        private readonly Color _backColor;
        private readonly Color _foreColor;

        /// <summary>
        ///  Creates a new DrawToolTipEventArgs with the given parameters.
        /// </summary>
        public DrawToolTipEventArgs(
            Graphics graphics,
            IWin32Window? associatedWindow,
            Control? associatedControl,
            Rectangle bounds,
            string? toolTipText,
            Color backColor,
            Color foreColor,
            Font? font)
        {
            Graphics = graphics ?? throw new ArgumentNullException(nameof(graphics));
            AssociatedWindow = associatedWindow;
            AssociatedControl = associatedControl;
            Bounds = bounds;
            ToolTipText = toolTipText;
            _backColor = backColor;
            _foreColor = foreColor;
            Font = font;
        }

        /// <summary>
        ///  Graphics object with which painting should be done.
        /// </summary>
        public Graphics Graphics { get; }

        /// <summary>
        ///  The window for which the tooltip is being painted.
        /// </summary>
        public IWin32Window? AssociatedWindow { get; }

        /// <summary>
        ///  The control for which the tooltip is being painted.
        /// </summary>
        public Control? AssociatedControl { get; }

        /// <summary>
        ///  The rectangle outlining the area in which the painting should be done.
        /// </summary>
        public Rectangle Bounds { get; }

        /// <summary>
        ///  The text that should be drawn.
        /// </summary>
        public string? ToolTipText { get; }

        /// <summary>
        ///  The font used to draw tooltip text.
        /// </summary>
        public Font? Font { get; }

        /// <summary>
        ///  Draws the background of the ToolTip.
        /// </summary>
        public void DrawBackground()
        {
            using var backBrush = _backColor.GetCachedSolidBrushScope();
            Graphics.FillRectangle(backBrush, Bounds);
        }

        /// <summary>
        ///  Draws the text (overloaded)
        /// </summary>
        public void DrawText()
        {
            // Pass in a set of flags to mimic default behavior
            DrawText(TextFormatFlags.HorizontalCenter | TextFormatFlags.VerticalCenter
                | TextFormatFlags.SingleLine | TextFormatFlags.HidePrefix);
        }

        /// <summary>
        ///  Draws the text (overloaded) - takes a TextFormatFlags argument.
        /// </summary>
        public void DrawText(TextFormatFlags flags)
        {
            TextRenderer.DrawText(Graphics, ToolTipText, Font, Bounds, _foreColor, flags);
        }

        /// <summary>
        ///  Draws a border for the ToolTip similar to the default border.
        /// </summary>
        public void DrawBorder()
        {
            ControlPaint.DrawBorder(Graphics, Bounds, SystemColors.WindowFrame, ButtonBorderStyle.Solid);
        }
    }
}
