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

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