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Viewing changes to external/xwt/Xwt.Gtk/Xwt.GtkBackend/ContextBackendHandler.cs

  • Committer: Package Import Robot
  • Author(s): Jo Shields
  • Date: 2013-05-12 09:46:03 UTC
  • mto: This revision was merged to the branch mainline in revision 29.
  • Revision ID: package-import@ubuntu.com-20130512094603-mad323bzcxvmcam0
Tags: upstream-4.0.5+dfsg
Import upstream version 4.0.5+dfsg

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external/xwt/Xwt.Gtk/Xwt.GtkBackend/ContextBackendHandler.cs
 
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// 
 
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// ContextBackendHandler.cs
 
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//  
 
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// Author:
 
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//       Lluis Sanchez <lluis@xamarin.com>
 
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//       Lytico (http://limada.sourceforge.net)
 
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// 
 
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// Copyright (c) 2012 Xamarin Inc
 
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// 
 
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// Permission is hereby granted, free of charge, to any person obtaining a copy
 
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// of this software and associated documentation files (the "Software"), to deal
 
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// in the Software without restriction, including without limitation the rights
 
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 
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// copies of the Software, and to permit persons to whom the Software is
 
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// furnished to do so, subject to the following conditions:
 
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// 
 
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// The above copyright notice and this permission notice shall be included in
 
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// all copies or substantial portions of the Software.
 
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// 
 
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 
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// THE SOFTWARE.
 
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using System;
 
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using Xwt.CairoBackend;
 
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using Xwt.Drawing;
 
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using Xwt.Engine;
 
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using Xwt.Backends;
 
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namespace Xwt.GtkBackend
 
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{
 
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        public class ContextBackendHandler: CairoContextBackendHandler
 
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        {
 
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                protected override void SetSourceImage (Cairo.Context ctx, object img, double x, double y)
 
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                {
 
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                        Gdk.Pixbuf pb = (Gdk.Pixbuf)img;
 
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                        Gdk.CairoHelper.SetSourcePixbuf (ctx, pb, x, y);
 
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                }
 
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                protected override Size GetImageSize (object img)
 
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                {
 
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                        Gdk.Pixbuf pb = (Gdk.Pixbuf)img;
 
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                        return new Size (pb.Width, pb.Height);
 
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                }
 
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        }
 
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        public class ContextBackendHandlerWithPango: ContextBackendHandler
 
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        {
 
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                public override void DrawTextLayout (object backend, TextLayout layout, double x, double y)
 
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                {
 
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                        Pango.Layout pl = (Pango.Layout)WidgetRegistry.GetBackend (layout);
 
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                        CairoContextBackend ctx = (CairoContextBackend)backend;
 
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                        ctx.Context.MoveTo (x, y);
 
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                        if (layout.Height <= 0) {
 
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                                Pango.CairoHelper.ShowLayout (ctx.Context, pl);
 
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                        } else {
 
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                                var lc = pl.LineCount;
 
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                                var scale = Pango.Scale.PangoScale;
 
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                                double h = 0;
 
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                                for (int i=0; i<lc; i++) {
 
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                                        var line = pl.Lines [i];
 
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                                        var ext = new Pango.Rectangle ();
 
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                                        var extl = new Pango.Rectangle ();
 
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                                        line.GetExtents (ref ext, ref extl);
 
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                                        h += (extl.Height / scale);
 
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                                        if (h > layout.Height)
 
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                                                break;
 
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                                        ctx.Context.MoveTo (x, y + h);
 
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                                        Pango.CairoHelper.ShowLayoutLine (ctx.Context, line);
 
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                                }
 
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                        }
 
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                }
 
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        }
 
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}
 
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