File size: 2,242 Bytes
b1b3bae | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 | using System;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Imaging;
using System.Windows.Forms;
namespace SkiaSharp.Views.Desktop
{
[DefaultEvent("PaintSurface")]
[DefaultProperty("Name")]
public class SKControl : Control
{
private readonly bool designMode;
private Bitmap bitmap;
public SKControl()
{
DoubleBuffered = true;
SetStyle(ControlStyles.ResizeRedraw, true);
designMode = DesignMode || LicenseManager.UsageMode == LicenseUsageMode.Designtime;
}
[Bindable(false)]
[Browsable(false)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
[EditorBrowsable(EditorBrowsableState.Never)]
public SKSize CanvasSize => bitmap == null ? SKSize.Empty : new SKSize(bitmap.Width, bitmap.Height);
[Category("Appearance")]
public event EventHandler<SKPaintSurfaceEventArgs> PaintSurface;
private bool painting = false;
protected override void OnPaint(PaintEventArgs e)
{
if (designMode)
return;
if (painting) return;
painting = true;
base.OnPaint(e);
// get the bitmap
CreateBitmap();
var data = bitmap.LockBits(new Rectangle(0, 0, Width, Height), ImageLockMode.WriteOnly, bitmap.PixelFormat);
// create the surface
var info = new SKImageInfo(Width, Height, SKImageInfo.PlatformColorType, SKAlphaType.Premul);
using (var surface = SKSurface.Create(info, data.Scan0, data.Stride))
{
// start drawing
OnPaintSurface(new SKPaintSurfaceEventArgs(surface, info));
surface.Canvas.Flush();
}
// write the bitmap to the graphics
bitmap.UnlockBits(data);
e.Graphics.DrawImage(bitmap, 0, 0);
painting = false;
}
protected virtual void OnPaintSurface(SKPaintSurfaceEventArgs e)
{
// invoke the event
PaintSurface?.Invoke(this, e);
}
protected override void Dispose(bool disposing)
{
base.Dispose(disposing);
FreeBitmap();
}
private void CreateBitmap()
{
if (bitmap == null || bitmap.Width != Width || bitmap.Height != Height)
{
FreeBitmap();
bitmap = new Bitmap(Width, Height, PixelFormat.Format32bppPArgb);
}
}
private void FreeBitmap()
{
if (bitmap != null)
{
bitmap.Dispose();
bitmap = null;
}
}
}
}
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