WinFormsPopupAlerts/TopFormBase.cs

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using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using System.Drawing;

namespace WinFormsPopupAlerts
{
    /// <summary>
    /// Represents an always top window.
    /// </summary>
    [System.ComponentModel.ToolboxItem(false)]
    public abstract class TopFormBase : Form
    {

        public virtual Rectangle RealBounds
        {
            get
            {
                return Rectangle.Empty;
            }
            set
            {
            }
        }

        protected override CreateParams CreateParams
        {
            get
            {
                CreateParams createParams = base.CreateParams;
                createParams.ExStyle |= 128;
                return createParams;
            }
        }

        protected virtual bool IsTopMost
        {
            get
            {
                return true;
            }
        }

        protected virtual IntPtr InsertAfterWindow
        {
            get
            {
                return (IntPtr)(this.IsTopMost ? -1 : 0);
            }
        }

        protected override bool ShowWithoutActivation
        {
            get
            {
                return true;
            }
        }