132 lines
5.2 KiB
C#
132 lines
5.2 KiB
C#
// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in 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,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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// Copyright (c) 2007 Novell, Inc. (http://www.novell.com)
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//
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// Authors:
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// Jonathan Pobst monkey@jpobst.com
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//
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//
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using System;
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using System.Drawing;
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using System.Drawing.Text;
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using System.Text;
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using System.Collections;
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namespace System.Windows.Forms
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{
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internal class TextBoxTextRenderer
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{
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private static Size max_size;
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private static bool use_textrenderer;
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private static StringFormat sf_nonprinting;
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private static StringFormat sf_printing;
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private static Hashtable measure_cache;
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static TextBoxTextRenderer ()
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{
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// On Windows, we want to use TextRenderer (GDI)
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// On Linux, we want to use DrawString (GDI+)
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// TextRenderer provides translation from TextRenderer to
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// DrawString, but I doubt it's exact enough.
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// Another option would be to put Pango here for Linux.
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int platform = (int)Environment.OSVersion.Platform;
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if (platform == 4 || platform == 128 || platform == 6)
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use_textrenderer = false;
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else
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use_textrenderer = true;
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// windows 2000 doesn't draw with gdi if bounds are In32.MaxValue
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max_size = new Size (Int16.MaxValue, Int16.MaxValue);
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sf_nonprinting = new StringFormat (StringFormat.GenericTypographic);
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sf_nonprinting.Trimming = StringTrimming.None;
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sf_nonprinting.FormatFlags = StringFormatFlags.DisplayFormatControl;
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sf_nonprinting.HotkeyPrefix = HotkeyPrefix.None;
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sf_printing = StringFormat.GenericTypographic;
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sf_printing.HotkeyPrefix = HotkeyPrefix.None;
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measure_cache = new Hashtable ();
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}
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public static void DrawText (Graphics g, string text, Font font, Color color, float x, float y, bool showNonPrint)
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{
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if (!use_textrenderer) {
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if (showNonPrint)
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g.DrawString (text, font, ThemeEngine.Current.ResPool.GetSolidBrush (color), x, y, sf_nonprinting);
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else
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g.DrawString (text, font, ThemeEngine.Current.ResPool.GetSolidBrush (color), x, y, sf_printing);
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} else {
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if (showNonPrint)
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TextRenderer.DrawTextInternal (g, text, font, new Rectangle (new Point ((int)x, (int)y), max_size), color, TextFormatFlags.NoPadding | TextFormatFlags.NoPrefix, false);
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else
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TextRenderer.DrawTextInternal (g, text, font, new Rectangle (new Point ((int)x, (int)y), max_size), color, TextFormatFlags.NoPadding | TextFormatFlags.NoPrefix, false);
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}
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}
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public static SizeF MeasureText (Graphics g, string text, Font font)
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{
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// Due to the way the TextBox currently works, it measures each
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// character one at a time. And it does this alot. So here we
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// are implementing a cache for each font/character combination
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// measurement. Since the number of fonts and number of characters
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// used tends to be small, this is a good performance gain for
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// not too much memory.
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if (text.Length == 1) {
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// If g.VisibleClipBounds is {X=0, Y=0, Width=1, Height=1}, then some characters
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// (in some fonts for some point sizes) return a different width then when the
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// VisibleClipBounds has a different (usually but not always more reasonable) value.
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// This state of the Graphics object can occur during initialization of text boxes
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// with preset Text values. See https://bugzilla.xamarin.com/show_bug.cgi?id=26258
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// for more details.
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string sep;
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var bounds = g.VisibleClipBounds;
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if (bounds.Width == 1 && bounds.Height == 1 && bounds.X == 0 && bounds.Y == 0)
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sep = "-1x1|";
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else
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sep = "|";
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string key = font.GetHashCode ().ToString () + sep + text;
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if (measure_cache.ContainsKey (key)) {
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return (SizeF)measure_cache[key];
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} else {
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SizeF size;
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if (!use_textrenderer)
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size = g.MeasureString (text, font, 10000, sf_nonprinting);
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else
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size = TextRenderer.MeasureTextInternal (g, text, font, Size.Empty, TextFormatFlags.NoPadding | TextFormatFlags.NoPrefix, false);
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measure_cache[key] = size;
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return size;
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}
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}
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if (!use_textrenderer)
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return g.MeasureString (text, font, 10000, sf_nonprinting);
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else
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return TextRenderer.MeasureTextInternal (g, text, font, Size.Empty, TextFormatFlags.NoPadding | TextFormatFlags.NoPrefix, false);
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}
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}
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}
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