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//
// TextLayoutBackendHandler.cs
//
// Author:
// Lluis Sanchez <lluis@xamarin.com>
//
// Copyright (c) 2011 Xamarin Inc
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
using System;
using Xwt.Backends;
using MonoMac.AppKit;
using MonoMac.Foundation;
using MonoMac.CoreText;
using MonoMac.CoreGraphics;
using Xwt.Engine;
using Xwt.Drawing;
using PointF = System.Drawing.PointF;
using SizeF = System.Drawing.SizeF;
using RectangleF = System.Drawing.RectangleF;
namespace Xwt.Mac
{
public class TextLayoutBackendHandler: ITextLayoutBackendHandler
{
class LayoutInfo
{
public CTFramesetter Framesetter;
public string Text;
public NSFont Font;
public float? Width, Height;
public TextTrimming TextTrimming;
}
public object Create (Xwt.Drawing.Context context)
{
return new LayoutInfo ();
}
public object Create (ICanvasBackend canvas)
{
return new LayoutInfo {
Font = (NSFont)canvas.Font
};
}
public void SetText (object backend, string text)
{
LayoutInfo li = (LayoutInfo)backend;
li.Text = text;
InvalidateFramesetter (li);
}
public void SetFont (object backend, Xwt.Drawing.Font font)
{
LayoutInfo li = (LayoutInfo)backend;
li.Font = (NSFont)WidgetRegistry.GetBackend (font);
InvalidateFramesetter (li);
}
public void SetWidth (object backend, double value)
{
LayoutInfo li = (LayoutInfo)backend;
li.Width = value < 0 ? null : (float?)value;
}
public void SetHeight (object backend, double value)
{
LayoutInfo li = (LayoutInfo)backend;
li.Height = value < 0 ? null : (float?)value;
}
public void SetTrimming (object backend, TextTrimming value)
{
LayoutInfo li = (LayoutInfo)backend;
li.TextTrimming = value;
}
public Size GetSize (object backend)
{
LayoutInfo li = (LayoutInfo)backend;
if (li.Framesetter == null)
return Size.Zero;
NSRange unused;
SizeF constraint = new SizeF (li.Width ?? float.MaxValue, float.MaxValue);
return li.Framesetter.SuggestFrameSize (new NSRange (0, li.Text.Length), null, constraint, out unused).ToXwtSize ();
}
static void InvalidateFramesetter (LayoutInfo li)
{
if (li.Framesetter != null) {
li.Framesetter.Dispose ();
li.Framesetter = null;
}
if (!string.IsNullOrEmpty (li.Text))
li.Framesetter = new CTFramesetter (CreateAttributedString (li));
}
static NSAttributedString CreateAttributedString (LayoutInfo li, string overrideText = null)
{
NSDictionary dict;
if (li.Font != null) {
dict = NSDictionary.FromObjectsAndKeys (
new object[] { li.Font, new NSNumber (true) },
new object[] { CTStringAttributeKey.Font, CTStringAttributeKey.ForegroundColorFromContext }
);
} else {
dict = NSDictionary.FromObjectsAndKeys (
new object[] { new NSNumber (true) },
new object[] { CTStringAttributeKey.ForegroundColorFromContext }
);
}
return new NSAttributedString (overrideText ?? li.Text, dict);
}
internal static void Draw (CGContext ctx, object layout, double x, double y)
{
LayoutInfo li = (LayoutInfo)layout;
if (li.Framesetter == null)
return;
CGPath path = new CGPath ();
path.AddRect (new RectangleF (0, 0, li.Width ?? float.MaxValue, li.Height ?? float.MaxValue));
CTFrame frame = li.Framesetter.GetFrame (new NSRange (0, li.Text.Length), path, null);
CTLine ellipsis = null;
bool ellipsize = li.Width.HasValue && li.TextTrimming == TextTrimming.WordElipsis;
if (ellipsize)
ellipsis = new CTLine (CreateAttributedString (li, "..."));
float lineHeight = layoutManager.DefaultLineHeightForFont (li.Font);
ctx.SaveState ();
ctx.TextMatrix = CGAffineTransform.MakeScale (1f, -1f);
ctx.TranslateCTM ((float)x, (float)y + li.Font.Ascender);
foreach (var line in frame.GetLines ()) {
ctx.TextPosition = PointF.Empty;
if (ellipsize) // we need to create a new CTLine here because the framesetter already truncated the text for the line
new CTLine (CreateAttributedString (li, li.Text.Substring (line.StringRange.Location)))
.GetTruncatedLine (li.Width.Value, CTLineTruncation.End, ellipsis).Draw (ctx);
else
line.Draw (ctx);
ctx.TranslateCTM (0, lineHeight);
}
ctx.RestoreState ();
}
static readonly NSLayoutManager layoutManager = new NSLayoutManager ();
}
}
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