110 lines
2.6 KiB
C#
110 lines
2.6 KiB
C#
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// adopted from: https://github.com/mono/xwt/blob/master/Xwt.XamMac/Xwt.Mac/ImageHandler.cs
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Reflection;
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using Gtk;
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using Gdk;
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using System.Runtime.InteropServices;
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using Cairo;
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using Rectangle = Gdk.Rectangle;
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namespace Samples
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{
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// This is a completely pointless widget, but its for testing subclassing Widget.OnDrawn
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public class GtkDrawingArea : Gtk.DrawingArea { }
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public class ImageBox : GtkDrawingArea
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{
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Pixbuf image;
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float yalign = 0.5f, xalign = 0.5f;
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public ImageBox(Pixbuf img) : this()
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{
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Image = img;
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}
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public ImageBox()
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{
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this.HasWindow = false;
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this.AppPaintable = true;
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}
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public Pixbuf Image {
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get { return image; }
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set {
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image = value;
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SetSizeRequest((int) image.Width, (int) image.Height);
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//QueueDraw();
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}
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}
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private Size SizeRequestet { get; set; }
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public float Yalign {
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get { return yalign; }
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set {
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yalign = value;
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QueueDraw();
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}
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}
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public float Xalign {
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get { return xalign; }
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set {
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xalign = value;
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QueueDraw();
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}
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}
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void DrawPixbuf(Cairo.Context ctx, Gdk.Pixbuf img, double x, double y, Size idesc)
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{
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ctx.Save();
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ctx.Translate(x, y);
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ctx.Scale(idesc.Width / (double) img.Width, idesc.Height / (double) img.Height);
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Gdk.CairoHelper.SetSourcePixbuf(ctx, img, 0, 0);
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#pragma warning disable 618
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using (var p = ctx.Source) {
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if (p is SurfacePattern pattern) {
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if (idesc.Width > img.Width || idesc.Height > img.Height) {
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// Fixes blur issue when rendering on an image surface
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pattern.Filter = Cairo.Filter.Fast;
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} else
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pattern.Filter = Cairo.Filter.Good;
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}
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}
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#pragma warning restore 618
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ctx.Paint();
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ctx.Restore();
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}
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protected override bool OnDrawn(Cairo.Context cr)
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{
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if (image == default)
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return true;
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var a = Allocation;
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var size = Allocation.Size;
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Pixbuf pixbuff = image;
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// HACK: Gtk sends sometimes an expose/draw event while the widget reallocates.
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// In that case we would draw in the wrong area, which may lead to artifacts
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// if no other widget updates it. Alternative: we could clip the
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// allocation bounds, but this may have other issues.
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if (a.Width == 1 && a.Height == 1 && a.X == -1 && a.Y == -1) // the allocation coordinates on reallocation
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return base.OnDrawn(cr);
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var x = (int) ((a.Width - (float) pixbuff.Width) * xalign);
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var y = (int) ((a.Height - (float) pixbuff.Height) * yalign);
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if (x < 0) x = 0;
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if (y < 0) y = 0;
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DrawPixbuf(cr, pixbuff, x, y, size);
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return base.OnDrawn(cr);
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}
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}
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}
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