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Viewing changes to external/xwt/Xwt.Mac/Xwt.Mac/TextLayoutBackendHandler.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.Mac/Xwt.Mac/TextLayoutBackendHandler.cs
 
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// 
 
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// TextLayoutBackendHandler.cs
 
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//  
 
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// Author:
 
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//       Lluis Sanchez <lluis@xamarin.com>
 
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// 
 
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// Copyright (c) 2011 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.Backends;
 
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using MonoMac.AppKit;
 
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using MonoMac.Foundation;
 
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using MonoMac.CoreText;
 
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using MonoMac.CoreGraphics;
 
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using Xwt.Engine;
 
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using Xwt.Drawing;
 
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using PointF = System.Drawing.PointF;
 
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using SizeF = System.Drawing.SizeF;
 
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using RectangleF = System.Drawing.RectangleF;
 
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namespace Xwt.Mac
 
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{
 
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        public class TextLayoutBackendHandler: ITextLayoutBackendHandler
 
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        {
 
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                class LayoutInfo
 
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                {
 
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                        public CTFramesetter Framesetter;
 
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                        public string Text;
 
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                        public NSFont Font;
 
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                        public float? Width, Height;
 
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                        public TextTrimming TextTrimming;
 
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                }
 
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                public object Create (Xwt.Drawing.Context context)
 
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                {
 
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                        return new LayoutInfo ();
 
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                }
 
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                public object Create (ICanvasBackend canvas)
 
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                {
 
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                        return new LayoutInfo {
 
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                                Font = (NSFont)canvas.Font
 
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                        };
 
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                }
 
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                public void SetText (object backend, string text)
 
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                {
 
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                        LayoutInfo li = (LayoutInfo)backend;
 
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                        li.Text = text;
 
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                        InvalidateFramesetter (li);
 
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                }
 
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                public void SetFont (object backend, Xwt.Drawing.Font font)
 
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                {
 
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                        LayoutInfo li = (LayoutInfo)backend;
 
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                        li.Font = (NSFont)WidgetRegistry.GetBackend (font);
 
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                        InvalidateFramesetter (li);
 
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                }
 
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                public void SetWidth (object backend, double value)
 
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                {
 
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                        LayoutInfo li = (LayoutInfo)backend;
 
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                        li.Width = value < 0 ? null : (float?)value;
 
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                }
 
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                public void SetHeight (object backend, double value)
 
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                {
 
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                        LayoutInfo li = (LayoutInfo)backend;
 
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                        li.Height = value < 0 ? null : (float?)value;
 
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                }
 
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                public void SetTrimming (object backend, TextTrimming value)
 
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                {
 
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                        LayoutInfo li = (LayoutInfo)backend;
 
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                        li.TextTrimming = value;
 
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                }
 
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                public Size GetSize (object backend)
 
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                {
 
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                        LayoutInfo li = (LayoutInfo)backend;
 
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                        if (li.Framesetter == null)
 
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                                return Size.Zero;
 
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                        NSRange unused;
 
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                        SizeF constraint = new SizeF (li.Width ?? float.MaxValue, float.MaxValue);
 
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                        return li.Framesetter.SuggestFrameSize (new NSRange (0, li.Text.Length), null, constraint, out unused).ToXwtSize ();
 
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                }
 
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                static void InvalidateFramesetter (LayoutInfo li)
 
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                {
 
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                        if (li.Framesetter != null) {
 
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                                li.Framesetter.Dispose ();
 
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                                li.Framesetter = null;
 
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                        }
 
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                        if (!string.IsNullOrEmpty (li.Text))
 
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                                li.Framesetter = new CTFramesetter (CreateAttributedString (li));
 
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                }
 
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                static NSAttributedString CreateAttributedString (LayoutInfo li, string overrideText = null)
 
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                {
 
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                        NSDictionary dict;
 
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                        if (li.Font != null) {
 
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                                dict = NSDictionary.FromObjectsAndKeys (
 
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                                        new object[] { li.Font, new NSNumber (true) },
 
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                                        new object[] { CTStringAttributeKey.Font, CTStringAttributeKey.ForegroundColorFromContext }
 
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                                );
 
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                        } else {
 
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                                dict = NSDictionary.FromObjectsAndKeys (
 
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                                        new object[] { new NSNumber (true) },
 
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                                        new object[] { CTStringAttributeKey.ForegroundColorFromContext }
 
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                                );
 
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                        }
 
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                        return new NSAttributedString (overrideText ?? li.Text, dict);
 
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                }
 
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                internal static void Draw (CGContext ctx, object layout, double x, double y)
 
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                {
 
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                        LayoutInfo li = (LayoutInfo)layout;
 
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                        if (li.Framesetter == null)
 
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                                return;
 
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                        CGPath path = new CGPath ();
 
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                        path.AddRect (new RectangleF (0, 0, li.Width ?? float.MaxValue, li.Height ?? float.MaxValue));
 
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                        CTFrame frame = li.Framesetter.GetFrame (new NSRange (0, li.Text.Length), path, null);
 
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                        CTLine ellipsis = null;
 
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                        bool ellipsize = li.Width.HasValue && li.TextTrimming == TextTrimming.WordElipsis;
 
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                        if (ellipsize)
 
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                                ellipsis = new CTLine (CreateAttributedString (li, "..."));
 
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                        float lineHeight = layoutManager.DefaultLineHeightForFont (li.Font);
 
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                        ctx.SaveState ();
 
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                        ctx.TextMatrix = CGAffineTransform.MakeScale (1f, -1f);
 
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                        ctx.TranslateCTM ((float)x, (float)y + li.Font.Ascender);
 
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                        foreach (var line in frame.GetLines ()) {
 
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                                ctx.TextPosition = PointF.Empty;
 
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                                if (ellipsize) // we need to create a new CTLine here because the framesetter already truncated the text for the line
 
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                                        new CTLine (CreateAttributedString (li, li.Text.Substring (line.StringRange.Location)))
 
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                                                .GetTruncatedLine (li.Width.Value, CTLineTruncation.End, ellipsis).Draw (ctx);
 
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                                else
 
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                                        line.Draw (ctx);
 
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                                ctx.TranslateCTM (0, lineHeight);
 
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                        }
 
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                        ctx.RestoreState ();
 
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                }
 
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                static readonly NSLayoutManager layoutManager = new NSLayoutManager ();
 
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        }
 
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}
 
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