4 // Permission is hereby granted, free of charge, to any person obtaining
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5 // a copy of this software and associated documentation files (the
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6 // "Software"), to deal in the Software without restriction, including
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7 // without limitation the rights to use, copy, modify, merge, publish,
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8 // distribute, sublicense, and/or sell copies of the Software, and to
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9 // permit persons to whom the Software is furnished to do so, subject to
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10 // the following conditions:
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12 // The above copyright notice and this permission notice shall be
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13 // included in all copies or substantial portions of the Software.
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15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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16 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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17 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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18 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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19 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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20 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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21 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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23 // Copyright (c) 2006 Novell, Inc.
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26 // Jonathan Pobst (monkey@jpobst.com)
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30 using System.Drawing;
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31 using System.Runtime.InteropServices;
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33 using System.Drawing.Text;
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35 namespace System.Windows.Forms
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37 public sealed class TextRenderer
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39 #region Public Methods
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40 [MonoTODO("This should be correct for Windows, other platforms need a more accurate fallback method than the one provided")]
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41 public static void DrawText (IDeviceContext dc, string text, Font font, Rectangle bounds, Color foreColor, TextFormatFlags flags)
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43 if (Environment.OSVersion.Platform == PlatformID.Win32NT || Environment.OSVersion.Platform == PlatformID.Win32Windows) {
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44 Rectangle new_bounds = bounds;
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45 new_bounds.Offset ((int)(dc as Graphics).Transform.OffsetX + 0, (int)(dc as Graphics).Transform.OffsetY + 0);
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46 IntPtr hdc = dc.GetHdc ();
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48 SetTextColor (hdc, ColorTranslator.ToWin32 (foreColor));
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49 SetBkMode (hdc, 1); //1-Transparent, 2-Opaque
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51 VisualStyles.UXTheme.RECT r = VisualStyles.UXTheme.RECT.FromRectangle (new_bounds);
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54 SelectObject (hdc, font.ToHfont ());
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56 DrawText (hdc, text, text.Length, ref r, (int)flags);
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65 g = Graphics.FromHdc (dc.GetHdc ());
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67 StringFormat sf = FlagsToStringFormat (flags);
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69 using (Brush b = new SolidBrush (foreColor))
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70 g.DrawString (text, font, b, bounds, sf);
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72 if (!(dc is Graphics)) {
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79 [MonoTODO ("This should be correct for Windows, other platforms need a more accurate fallback method than the one provided")]
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80 public static void DrawText (IDeviceContext dc, string text, Font font, Point pt, Color foreColor, TextFormatFlags flags)
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82 if (Environment.OSVersion.Platform == PlatformID.Win32NT || Environment.OSVersion.Platform == PlatformID.Win32Windows) {
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83 IntPtr hdc = dc.GetHdc ();
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85 SetTextColor (hdc, ColorTranslator.ToWin32 (foreColor));
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86 SetBkMode (hdc, 1); //1-Transparent, 2-Opaque
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88 Size sz = MeasureText(text, font);
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90 VisualStyles.UXTheme.RECT r = new System.Windows.Forms.VisualStyles.UXTheme.RECT(pt.X, pt.Y, pt.X + sz.Width, pt.Y + sz.Height);
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93 SelectObject (hdc, font.ToHfont ());
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95 DrawText (hdc, text, text.Length, ref r, (int)flags);
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101 if (dc is Graphics)
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104 g = Graphics.FromHdc (dc.GetHdc ());
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106 StringFormat sf = FlagsToStringFormat (flags);
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108 using (Brush b = new SolidBrush (foreColor))
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109 g.DrawString (text, font, b, pt, sf);
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111 if (!(dc is Graphics)) {
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118 [MonoTODO ("This should be correct for Windows, other platforms need a more accurate fallback method than the one provided")]
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119 public static Size MeasureText (string text, Font font)
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121 if (Environment.OSVersion.Platform == PlatformID.Win32NT || Environment.OSVersion.Platform == PlatformID.Win32Windows) {
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122 Bitmap b = new Bitmap (5, 5);
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123 Graphics g = Graphics.FromImage (b);
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125 IntPtr hdc = g.GetHdc ();
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128 SelectObject (hdc, font.ToHfont ());
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130 VisualStyles.UXTheme.SIZE text_size = new System.Windows.Forms.VisualStyles.UXTheme.SIZE();
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132 GetTextExtentPoint32 (hdc, text, text.Length, out text_size);
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136 Size retval = text_size.ToSize();
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137 //retval.Height += 4;
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138 if (retval.Width > 0) retval.Width += 6;
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142 Bitmap b = new Bitmap (5, 5);
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143 Graphics g = Graphics.FromImage (b);
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145 Size retval = g.MeasureString(text,font).ToSize();
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146 if (retval.Width > 0) retval.Width += 6;
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152 #region Private Methods
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153 private static StringFormat FlagsToStringFormat (TextFormatFlags flags)
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155 StringFormat sf = new StringFormat ();
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157 // Translation table: http://msdn.microsoft.com/msdnmag/issues/06/03/TextRendering/default.aspx?fig=true#fig4
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159 // Horizontal Alignment
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160 if ((flags & TextFormatFlags.HorizontalCenter) == TextFormatFlags.HorizontalCenter)
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161 sf.Alignment = StringAlignment.Center;
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162 else if ((flags & TextFormatFlags.Right) == TextFormatFlags.Right)
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163 sf.Alignment = StringAlignment.Far;
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165 sf.Alignment = StringAlignment.Near;
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167 // Vertical Alignment
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168 if ((flags & TextFormatFlags.Bottom) == TextFormatFlags.Bottom)
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169 sf.LineAlignment = StringAlignment.Far;
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170 else if ((flags & TextFormatFlags.VerticalCenter) == TextFormatFlags.VerticalCenter)
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171 sf.LineAlignment = StringAlignment.Center;
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173 sf.LineAlignment = StringAlignment.Near;
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176 if ((flags & TextFormatFlags.EndEllipsis) == TextFormatFlags.EndEllipsis)
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177 sf.Trimming = StringTrimming.EllipsisCharacter;
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178 else if ((flags & TextFormatFlags.PathEllipsis) == TextFormatFlags.PathEllipsis)
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179 sf.Trimming = StringTrimming.EllipsisPath;
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180 else if ((flags & TextFormatFlags.WordEllipsis) == TextFormatFlags.WordEllipsis)
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181 sf.Trimming = StringTrimming.EllipsisWord;
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183 sf.Trimming = StringTrimming.Character;
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186 if ((flags & TextFormatFlags.NoPrefix) == TextFormatFlags.NoPrefix)
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187 sf.HotkeyPrefix = HotkeyPrefix.None;
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188 else if ((flags & TextFormatFlags.HidePrefix) == TextFormatFlags.HidePrefix)
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189 sf.HotkeyPrefix = HotkeyPrefix.Hide;
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191 sf.HotkeyPrefix = HotkeyPrefix.Show;
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194 if ((flags & TextFormatFlags.NoPadding) == TextFormatFlags.NoPadding)
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195 sf.FormatFlags |= StringFormatFlags.FitBlackBox;
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198 if ((flags & TextFormatFlags.SingleLine) == TextFormatFlags.SingleLine)
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199 sf.FormatFlags |= StringFormatFlags.NoWrap;
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200 else if ((flags & TextFormatFlags.TextBoxControl) == TextFormatFlags.TextBoxControl)
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201 sf.FormatFlags |= StringFormatFlags.LineLimit;
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204 if ((flags & TextFormatFlags.RightToLeft) == TextFormatFlags.RightToLeft)
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205 sf.FormatFlags |= StringFormatFlags.DirectionRightToLeft;
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206 if ((flags & TextFormatFlags.NoClipping) == TextFormatFlags.NoClipping)
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207 sf.FormatFlags |= StringFormatFlags.NoClip;
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208 sf.FormatFlags |= StringFormatFlags.NoClip;
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214 #region DllImports (Windows)
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215 [DllImport ("user32", CharSet = CharSet.Unicode)]
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216 static extern int DrawText (IntPtr hdc, string lpStr, int nCount, ref VisualStyles.UXTheme.RECT lpRect, int wFormat);
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218 [DllImport ("gdi32")]
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219 static extern int SetTextColor (IntPtr hdc, int crColor);
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221 [DllImport ("gdi32")]
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222 private extern static IntPtr SelectObject (IntPtr hDC, IntPtr hObject);
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224 [DllImport ("gdi32")]
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225 static extern int SetBkColor (IntPtr hdc, int crColor);
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227 [DllImport ("gdi32")]
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228 static extern int SetBkMode (IntPtr hdc, int iBkMode);
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230 [DllImport ("gdi32")]
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231 static extern bool GetTextExtentExPoint (IntPtr hdc, string lpszStr, int cchString, int nMaxExtent, IntPtr lpnFit, IntPtr alpDx, out VisualStyles.UXTheme.SIZE lpSize);
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233 [DllImport ("gdi32")]
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234 static extern bool GetTextExtentPoint32 (IntPtr hdc, string lpString, int cbString, out VisualStyles.UXTheme.SIZE lpSize);
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