Move ShiftUI source code to ShiftOS

This'll be a lot easier to work on.

1 files changed, 131 insertions, 0 deletions

diff --git a/source/ShiftUI/Internal/TextBoxTextRenderer.cs b/source/ShiftUI/Internal/TextBoxTextRenderer.cs
new file mode 100644
index 0000000..3e908f3
--- /dev/null
+++ b/source/ShiftUI/Internal/TextBoxTextRenderer.cs
@@ -0,0 +1,131 @@
+// 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.
+//
+// Copyright (c) 2007 Novell, Inc. (http://www.novell.com)
+//
+// Authors:
+//	Jonathan Pobst	[email protected]
+//
+//
+
+using System;
+using System.Drawing;
+using System.Drawing.Text;
+using System.Text;
+using System.Collections;
+
+namespace ShiftUI
+{
+	internal class TextBoxTextRenderer
+	{
+		private static Size max_size;
+		private static bool use_textrenderer;
+		private static StringFormat sf_nonprinting;
+		private static StringFormat sf_printing;
+		private static Hashtable measure_cache;
+				
+		static TextBoxTextRenderer ()
+		{
+			// On Windows, we want to use TextRenderer (GDI)
+			// On Linux, we want to use DrawString (GDI+)
+			// TextRenderer provides translation from TextRenderer to
+			// DrawString, but I doubt it's exact enough.
+			// Another option would be to put Pango here for Linux.
+			int platform = (int)Environment.OSVersion.Platform;
+			
+			if (platform == 4 || platform == 128 || platform == 6)
+				use_textrenderer = false;
+			else
+				use_textrenderer = true;
+
+			// windows 2000 doesn't draw with gdi if bounds are In32.MaxValue
+			max_size = new Size (Int16.MaxValue, Int16.MaxValue);
+			
+			sf_nonprinting = new StringFormat (StringFormat.GenericTypographic);
+			sf_nonprinting.Trimming = StringTrimming.None;
+			sf_nonprinting.FormatFlags = StringFormatFlags.DisplayFormatControl;	
+			sf_nonprinting.HotkeyPrefix = HotkeyPrefix.None;		
+
+			sf_printing = StringFormat.GenericTypographic;
+			sf_printing.HotkeyPrefix = HotkeyPrefix.None;
+			
+			measure_cache = new Hashtable ();
+		}
+		
+		public static void DrawText (Graphics g, string text, Font font, Color color, float x, float y, bool showNonPrint)
+		{
+			if (!use_textrenderer) {
+				if (showNonPrint)
+					g.DrawString (text, font, ThemeEngine.Current.ResPool.GetSolidBrush (color), x, y, sf_nonprinting);
+				else
+					g.DrawString (text, font, ThemeEngine.Current.ResPool.GetSolidBrush (color), x, y, sf_printing);
+			} else {
+				if (showNonPrint)
+					TextRenderer.DrawTextInternal (g, text, font, new Rectangle (new Point ((int)x, (int)y), max_size), color, TextFormatFlags.NoPadding | TextFormatFlags.NoPrefix, false);
+				else
+					TextRenderer.DrawTextInternal (g, text, font, new Rectangle (new Point ((int)x, (int)y), max_size), color, TextFormatFlags.NoPadding | TextFormatFlags.NoPrefix, false);
+			}
+		}
+		
+		public static SizeF MeasureText (Graphics g, string text, Font font)
+		{
+			// Due to the way the TextBox currently works, it measures each
+			// character one at a time.  And it does this alot.  So here we
+			// are implementing a cache for each font/character combination
+			// measurement.  Since the number of fonts and number of characters
+			// used tends to be small, this is a good performance gain for
+			// not too much memory.
+			if (text.Length == 1) {
+				// If g.VisibleClipBounds is {X=0, Y=0, Width=1, Height=1}, then some characters
+				// (in some fonts for some point sizes) return a different width then when the
+				// VisibleClipBounds has a different (usually but not always more reasonable) value.
+				// This state of the Graphics object can occur during initialization of text boxes
+				// with preset Text values. See https://bugzilla.xamarin.com/show_bug.cgi?id=26258
+				// for more details.
+				string sep;
+				var bounds = g.VisibleClipBounds;
+				if (bounds.Width == 1 && bounds.Height == 1 && bounds.X == 0 && bounds.Y == 0)
+					sep = "-1x1|";
+				else
+					sep = "|";
+				string key = font.GetHashCode ().ToString () + sep + text;
+				
+				if (measure_cache.ContainsKey (key)) {
+					return (SizeF)measure_cache[key];
+				} else {
+					SizeF size;
+					
+					if (!use_textrenderer)
+						size = g.MeasureString (text, font, 10000, sf_nonprinting);
+					else
+						size = TextRenderer.MeasureTextInternal (g, text, font, Size.Empty, TextFormatFlags.NoPadding | TextFormatFlags.NoPrefix, false);
+				
+					measure_cache[key] = size;
+				
+					return size;
+				}
+			}
+			
+			if (!use_textrenderer)
+				return g.MeasureString (text, font, 10000, sf_nonprinting);
+			else
+				return TextRenderer.MeasureTextInternal (g, text, font, Size.Empty, TextFormatFlags.NoPadding | TextFormatFlags.NoPrefix, false);
+		}
+	}
+}