3rdpartylibs/fastreports.wpf/FastReport.DesignExt/Controls/SampleReportControl.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using System.ComponentModel;
using System.Drawing;
using FastReport.Utils;

namespace FastReport.Controls
{
    internal class SampleReportControl : Control
    {
        private Report report;
        private float zoom;
        private bool fullPagePreview;

        [Browsable(false)]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
        public Report Report
        {
            get { return report; }
            set
            {
                report = value;
                Refresh();
            }
        }

        [DefaultValue(1f)]
        public float Zoom
        {
            get { return zoom; }
            set
            {
                zoom = value;
                Refresh();
            }
        }

        [DefaultValue(false)]
        public bool FullPagePreview
        {
            get { return fullPagePreview; }
            set
            {
                fullPagePreview = value;
                Refresh();
            }
        }

        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);
            Graphics g = e.Graphics;
#if AVALONIA
            g.FontScale = 1;
#endif

            if (report != null && report.Pages.Count > 0 && report.Pages[0] is ReportPage)
            {
                ReportPage page = report.Pages[0] as ReportPage;

                float zoom = this.zoom;
                if (FullPagePreview)
                {
                    float pageWidth = page.WidthInPixels;
                    float pageHeight = page.HeightInPixels;
                    zoom = Math.Min((Width - 20) / pageWidth, (Height - 20) / pageHeight);
                }

                FRPaintEventArgs args = new FRPaintEventArgs(g, zoom, zoom, report.GraphicCache);
                g.TranslateTransform(10, 10);
                page.Draw(args);
                g.TranslateTransform(-10, -10);
            }

            // draw control frame
            this.DrawVisualStyleBorder(g, new Rectangle(0, 0, Width - 1, Height - 1));
        }

        public SampleReportControl()
        {
            zoom = 1;
            BackColor = SystemColors.AppWorkspace;
            SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.OptimizedDoubleBuffer | ControlStyles.ResizeRedraw, true);
        }
    }
}