CoolPrintPreview/CoolPrintPreviewControl.cs

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using System;
using System.Data;
using System.Collections.Generic;
using System.Diagnostics;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Text;
using System.Drawing.Printing;
using System.Drawing.Imaging;
using System.Windows.Forms;
using System.Windows.Forms.Design;

namespace CoolPrintPreview
{
    /// <summary>
    /// Specifies the zoom mode for the <see cref="CoolPrintPreviewControl"/> control.
    /// </summary>
    internal enum ZoomMode
    {
        /// <summary>
        /// Show the preview in actual size.
        /// </summary>
        ActualSize,
        /// <summary>
        /// Show a full page.
        /// </summary>
        FullPage,
        /// <summary>
        /// Show a full page width.
        /// </summary>
        PageWidth,
        /// <summary>
        /// Show two full pages.
        /// </summary>
        TwoPages,
        /// <summary>
        /// Use the zoom factor specified by the <see cref="CoolPrintPreviewControl.Zoom"/> property.
        /// </summary>
        Custom
    }

    /// <summary>
    /// Represents a preview of one or two pages in a <see cref="PrintDocument"/>.
    /// </summary>
    /// <remarks>
    /// This control is similar to the standard <see cref="PrintPreviewControl"/> but
    /// it displays pages as they are rendered. By contrast, the standard control 
    /// waits until the entire document is rendered before it displays anything.
    /// </remarks>
    internal class CoolPrintPreviewControl : UserControl
    {
        Panel hidess;
        int _first, _last, _index;
        //-------------------------------------------------------------
        #region ** fields

        PrintDocument _doc;
        ZoomMode _zoomMode;
        double _zoom;
        int _startPage;