mcs/class/Managed.Windows.Forms/System.Windows.Forms/GroupBoxRenderer.cs

   1 //\r
   2 // GroupBoxRenderer.cs\r
   3 //\r
   4 // Permission is hereby granted, free of charge, to any person obtaining\r
   5 // a copy of this software and associated documentation files (the\r
   6 // "Software"), to deal in the Software without restriction, including\r
   7 // without limitation the rights to use, copy, modify, merge, publish,\r
   8 // distribute, sublicense, and/or sell copies of the Software, and to\r
   9 // permit persons to whom the Software is furnished to do so, subject to\r
  10 // the following conditions:\r
  11 // \r
  12 // The above copyright notice and this permission notice shall be\r
  13 // included in all copies or substantial portions of the Software.\r
  14 // \r
  15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,\r
  16 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\r
  17 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND\r
  18 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE\r
  19 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION\r
  20 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION\r
  21 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.\r
  22 //\r
  23 // Copyright (c) 2006 Novell, Inc.\r
  24 //\r
  25 // Authors:\r
  26 //      Jonathan Pobst (monkey@jpobst.com)\r
  27 //\r
  28 \r
  29 #if NET_2_0\r
  30 using System.Drawing;\r
  31 using System.Windows.Forms.VisualStyles;\r
  32 \r
  33 namespace System.Windows.Forms\r
  34 {\r
  35         public sealed class GroupBoxRenderer\r
  36         {\r
  37                 private static bool always_use_visual_styles = false;\r
  38                 \r
  39                 #region Private Constructor\r
  40                 private GroupBoxRenderer () { }\r
  41                 #endregion\r
  42 \r
  43                 #region Public Static Methods\r
  44                 public static void DrawGroupBox (Graphics g, Rectangle bounds, GroupBoxState state)\r
  45                 {\r
  46                         DrawGroupBox (g, bounds, String.Empty, null, Color.Empty, TextFormatFlags.Default, state);\r
  47                 }\r
  48 \r
  49                 public static void DrawGroupBox (Graphics g, Rectangle bounds, string groupBoxText, Font font, GroupBoxState state)\r
  50                 {\r
  51                         DrawGroupBox (g, bounds, groupBoxText, font, Color.Empty, TextFormatFlags.Default, state);\r
  52                 }\r
  53 \r
  54                 public static void DrawGroupBox (Graphics g, Rectangle bounds, string groupBoxText, Font font, Color textColor, GroupBoxState state)\r
  55                 {\r
  56                         DrawGroupBox (g, bounds, groupBoxText, font, textColor, TextFormatFlags.Default, state);\r
  57                 }\r
  58 \r
  59                 public static void DrawGroupBox (Graphics g, Rectangle bounds, string groupBoxText, Font font, TextFormatFlags flags, GroupBoxState state)\r
  60                 {\r
  61                         DrawGroupBox (g, bounds, groupBoxText, font, Color.Empty, flags, state);\r
  62                 }\r
  63 \r
  64                 public static void DrawGroupBox (Graphics g, Rectangle bounds, string groupBoxText, Font font, Color textColor, TextFormatFlags flags, GroupBoxState state)\r
  65                 {\r
  66                         Size font_size = TextRenderer.MeasureText (groupBoxText, font);\r
  67 \r
  68                         if (Application.RenderWithVisualStyles || always_use_visual_styles == true) {\r
  69                                 VisualStyleRenderer vsr;\r
  70                                 Rectangle new_bounds;\r
  71 \r
  72                                 switch (state) {\r
  73                                         case GroupBoxState.Normal:\r
  74                                         default:\r
  75                                                 vsr = new VisualStyleRenderer (VisualStyleElement.Button.GroupBox.Normal);\r
  76                                                 new_bounds = new Rectangle (bounds.Left, bounds.Top + (int)(font_size.Height / 2) - 1, bounds.Width, bounds.Height - (int)(font_size.Height / 2) + 1);\r
  77                                                 break;\r
  78                                         case GroupBoxState.Disabled:\r
  79                                                 vsr = new VisualStyleRenderer (VisualStyleElement.Button.GroupBox.Disabled);\r
  80                                                 new_bounds = new Rectangle (bounds.Left, bounds.Top + (int)(font_size.Height / 2) - 2, bounds.Width, bounds.Height - (int)(font_size.Height / 2) + 2);\r
  81                                                 break;\r
  82                                 }\r
  83 \r
  84                                 // Don't paint over the background where we are going to put the text\r
  85                                 Region old_clip = g.Clip;\r
  86                                 g.SetClip (new Rectangle (bounds.Left + 9, bounds.Top, font_size.Width - 3, font_size.Height), System.Drawing.Drawing2D.CombineMode.Exclude);\r
  87 \r
  88                                 if (groupBoxText == String.Empty)\r
  89                                         vsr.DrawBackground (g, bounds);\r
  90                                 else\r
  91                                         vsr.DrawBackground (g, new_bounds);\r
  92 \r
  93                                 g.Clip = old_clip;\r
  94 \r
  95                                 if (textColor == Color.Empty)\r
  96                                         textColor = vsr.GetColor (ColorProperty.TextColor);\r
  97 \r
  98                                 if (groupBoxText != String.Empty)\r
  99                                         TextRenderer.DrawText (g, groupBoxText, font, new Point (bounds.Left + 8, bounds.Top), textColor, flags);\r
 100                         }\r
 101                         else {\r
 102                                 // MS has a pretty big bug when rendering the non-visual styles group box.  Instead of using the height\r
 103                                 // part of the bounds as height, they use it as the bottom, so the boxes are drawn in completely different\r
 104                                 // places.  Rather than emulate this bug, we do it correctly.  After googling for a while, I don't think\r
 105                                 // anyone has ever actually used this class for anything, so it should be fine.  :)\r
 106                                 Rectangle new_bounds = new Rectangle (bounds.Left, bounds.Top + (int)(font_size.Height / 2) - 1, bounds.Width, bounds.Height - (int)(font_size.Height / 2) + 1);\r
 107                                 \r
 108                                 // Don't paint over the background where we are going to put the text\r
 109                                 Region old_clip = g.Clip;\r
 110                                 g.SetClip (new Rectangle (bounds.Left + 9, bounds.Top, font_size.Width - 3, font_size.Height), System.Drawing.Drawing2D.CombineMode.Exclude);\r
 111                                 \r
 112                                 ControlPaint.DrawBorder3D (g, new_bounds, Border3DStyle.Etched);\r
 113                                 \r
 114                                 g.Clip = old_clip;\r
 115 \r
 116                                 if (groupBoxText != String.Empty)\r
 117                                         TextRenderer.DrawText (g, groupBoxText, font, new Point (bounds.Left + 8, bounds.Top), textColor, flags);\r
 118                         }\r
 119                 }\r
 120 \r
 121                 public static bool IsBackgroundPartiallyTransparent (GroupBoxState state)\r
 122                 {\r
 123                         if (!VisualStyleRenderer.IsSupported)\r
 124                                 return false;\r
 125 \r
 126                         VisualStyleRenderer vsr;\r
 127 \r
 128                         switch (state) {\r
 129                                 case GroupBoxState.Normal:\r
 130                                 default:\r
 131                                         vsr = new VisualStyleRenderer (VisualStyleElement.Button.GroupBox.Normal);\r
 132                                         break;\r
 133                                 case GroupBoxState.Disabled:\r
 134                                         vsr = new VisualStyleRenderer (VisualStyleElement.Button.GroupBox.Disabled);\r
 135                                         break;\r
 136                         }\r
 137 \r
 138                         return vsr.IsBackgroundPartiallyTransparent ();\r
 139                 }\r
 140 \r
 141                 public static void DrawParentBackground (Graphics g, Rectangle bounds, Control childControl)\r
 142                 {\r
 143                         if (!VisualStyleRenderer.IsSupported)\r
 144                                 return;\r
 145                         \r
 146                         VisualStyleRenderer vsr = new VisualStyleRenderer (VisualStyleElement.Button.GroupBox.Normal);\r
 147 \r
 148                         vsr.DrawParentBackground (g, bounds, childControl);\r
 149                 }\r
 150                 #endregion\r
 151 \r
 152                 #region Public Static Properties\r
 153                 public static bool RenderMatchingApplicationState {\r
 154                         get { return !always_use_visual_styles; }\r
 155                         set { always_use_visual_styles = !value; }\r
 156                 }\r
 157                 #endregion\r
 158         }\r
 159 }\r
 160 #endif