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 using System.Drawing;
  30 using System.Windows.Forms.VisualStyles;
  31
  32 namespace System.Windows.Forms
  33 {
  34         public sealed class GroupBoxRenderer
  35         {
  36                 private static bool always_use_visual_styles = false;
  37
  38                 #region Private Constructor
  39                 private GroupBoxRenderer () { }
  40                 #endregion
  41
  42                 #region Public Static Methods
  43                 public static void DrawGroupBox (Graphics g, Rectangle bounds, GroupBoxState state)
  44                 {
  45                         DrawGroupBox (g, bounds, String.Empty, null, Color.Empty, TextFormatFlags.Default, state);
  46                 }
  47
  48                 public static void DrawGroupBox (Graphics g, Rectangle bounds, string groupBoxText, Font font, GroupBoxState state)
  49                 {
  50                         DrawGroupBox (g, bounds, groupBoxText, font, Color.Empty, TextFormatFlags.Default, state);
  51                 }
  52
  53                 public static void DrawGroupBox (Graphics g, Rectangle bounds, string groupBoxText, Font font, Color textColor, GroupBoxState state)
  54                 {
  55                         DrawGroupBox (g, bounds, groupBoxText, font, textColor, TextFormatFlags.Default, state);
  56                 }
  57
  58                 public static void DrawGroupBox (Graphics g, Rectangle bounds, string groupBoxText, Font font, TextFormatFlags flags, GroupBoxState state)
  59                 {
  60                         DrawGroupBox (g, bounds, groupBoxText, font, Color.Empty, flags, state);
  61                 }
  62
  63                 public static void DrawGroupBox (Graphics g, Rectangle bounds, string groupBoxText, Font font, Color textColor, TextFormatFlags flags, GroupBoxState state)
  64                 {
  65                         Size font_size = TextRenderer.MeasureText (groupBoxText, font);
  66
  67                         if (Application.RenderWithVisualStyles || always_use_visual_styles == true) {
  68                                 VisualStyleRenderer vsr;
  69                                 Rectangle new_bounds;
  70
  71                                 switch (state) {
  72                                         case GroupBoxState.Normal:
  73                                         default:
  74                                                 vsr = new VisualStyleRenderer (VisualStyleElement.Button.GroupBox.Normal);
  75                                                 new_bounds = new Rectangle (bounds.Left, bounds.Top + (int)(font_size.Height / 2) - 1, bounds.Width, bounds.Height - (int)(font_size.Height / 2) + 1);
  76                                                 break;
  77                                         case GroupBoxState.Disabled:
  78                                                 vsr = new VisualStyleRenderer (VisualStyleElement.Button.GroupBox.Disabled);
  79                                                 new_bounds = new Rectangle (bounds.Left, bounds.Top + (int)(font_size.Height / 2) - 2, bounds.Width, bounds.Height - (int)(font_size.Height / 2) + 2);
  80                                                 break;
  81                                 }
  82
  83                                 if (groupBoxText == String.Empty)
  84                                         vsr.DrawBackground (g, bounds);
  85                                 else
  86                                         vsr.DrawBackgroundExcludingArea (g, new_bounds, new Rectangle (bounds.Left + 9, bounds.Top, font_size.Width - 3, font_size.Height));
  87
  88                                 if (textColor == Color.Empty)
  89                                         textColor = vsr.GetColor (ColorProperty.TextColor);
  90
  91                                 if (groupBoxText != String.Empty)
  92                                         TextRenderer.DrawText (g, groupBoxText, font, new Point (bounds.Left + 8, bounds.Top), textColor, flags);
  93                         }
  94                         else {
  95                                 // MS has a pretty big bug when rendering the non-visual styles group box.  Instead of using the height
  96                                 // part of the bounds as height, they use it as the bottom, so the boxes are drawn in completely different
  97                                 // places.  Rather than emulate this bug, we do it correctly.  After googling for a while, I don't think
  98                                 // anyone has ever actually used this class for anything, so it should be fine.  :)
  99                                 Rectangle new_bounds = new Rectangle (bounds.Left, bounds.Top + (int)(font_size.Height / 2), bounds.Width, bounds.Height - (int)(font_size.Height / 2));
 100
 101                                 // Don't paint over the background where we are going to put the text
 102                                 Region old_clip = g.Clip;
 103                                 g.SetClip (new Rectangle (bounds.Left + 9, bounds.Top, font_size.Width - 3, font_size.Height), System.Drawing.Drawing2D.CombineMode.Exclude);
 104
 105                                 ControlPaint.DrawBorder3D (g, new_bounds, Border3DStyle.Etched);
 106
 107                                 g.Clip = old_clip;
 108
 109                                 if (groupBoxText != String.Empty) {
 110                                         if (textColor == Color.Empty)
 111                                                 textColor = state == GroupBoxState.Normal ? SystemColors.ControlText :
 112                                                         SystemColors.GrayText;
 113                                         TextRenderer.DrawText (g, groupBoxText, font, new Point (bounds.Left + 8, bounds.Top), textColor, flags);
 114                                 }
 115                         }
 116                 }
 117
 118                 public static bool IsBackgroundPartiallyTransparent (GroupBoxState state)
 119                 {
 120                         if (!VisualStyleRenderer.IsSupported)
 121                                 return false;
 122
 123                         VisualStyleRenderer vsr;
 124
 125                         switch (state) {
 126                                 case GroupBoxState.Normal:
 127                                 default:
 128                                         vsr = new VisualStyleRenderer (VisualStyleElement.Button.GroupBox.Normal);
 129                                         break;
 130                                 case GroupBoxState.Disabled:
 131                                         vsr = new VisualStyleRenderer (VisualStyleElement.Button.GroupBox.Disabled);
 132                                         break;
 133                         }
 134
 135                         return vsr.IsBackgroundPartiallyTransparent ();
 136                 }
 137
 138                 public static void DrawParentBackground (Graphics g, Rectangle bounds, Control childControl)
 139                 {
 140                         if (!VisualStyleRenderer.IsSupported)
 141                                 return;
 142
 143                         VisualStyleRenderer vsr = new VisualStyleRenderer (VisualStyleElement.Button.GroupBox.Normal);
 144
 145                         vsr.DrawParentBackground (g, bounds, childControl);
 146                 }
 147                 #endregion
 148
 149                 #region Public Static Properties
 150                 public static bool RenderMatchingApplicationState {
 151                         get { return !always_use_visual_styles; }
 152                         set { always_use_visual_styles = !value; }
 153                 }
 154                 #endregion
 155         }
 156 }