class/Managed.Windows.Forms/System.Windows.Forms/ComboBoxRenderer.cs

   1 //
   2 // ComboBoxRenderer.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 ComboBoxRenderer
  36         {
  37                 #region Private Constructor
  38                 private ComboBoxRenderer () { }
  39                 #endregion
  40
  41                 #region Public Static Methods
  42                 public static void DrawDropDownButton (Graphics g, Rectangle bounds, ComboBoxState state)
  43                 {
  44                         if (!IsSupported)
  45                                 throw new InvalidOperationException ();
  46
  47                         GetComboRenderer (state).DrawBackground (g, bounds);
  48                 }
  49
  50                 public static void DrawTextBox (Graphics g, Rectangle bounds, string comboBoxText, Font font, Rectangle textBounds, TextFormatFlags flags, ComboBoxState state)
  51                 {
  52                         if (!IsSupported)
  53                                 throw new InvalidOperationException ();
  54
  55                         GetTextBoxRenderer (state).DrawBackground (g, bounds);
  56
  57                         if (textBounds == Rectangle.Empty)
  58                                 textBounds = new Rectangle (bounds.Left + 3, bounds.Top, bounds.Width - 4, bounds.Height);
  59
  60                         if (comboBoxText != String.Empty)
  61                                 if (state == ComboBoxState.Disabled)
  62                                         TextRenderer.DrawText (g, comboBoxText, font, textBounds, SystemColors.GrayText, flags);
  63                                 else
  64                                         TextRenderer.DrawText (g, comboBoxText, font, textBounds, SystemColors.ControlText, flags);
  65                 }
  66
  67                 public static void DrawTextBox (Graphics g, Rectangle bounds, ComboBoxState state)
  68                 {
  69                         DrawTextBox (g, bounds, String.Empty, null, Rectangle.Empty, TextFormatFlags.VerticalCenter, state);
  70                 }
  71
  72                 public static void DrawTextBox (Graphics g, Rectangle bounds, string comboBoxText, Font font, ComboBoxState state)
  73                 {
  74                         DrawTextBox (g, bounds, comboBoxText, font, Rectangle.Empty, TextFormatFlags.VerticalCenter, state);
  75                 }
  76
  77                 public static void DrawTextBox (Graphics g, Rectangle bounds, string comboBoxText, Font font, Rectangle textBounds, ComboBoxState state)
  78                 {
  79                         DrawTextBox (g, bounds, comboBoxText, font, textBounds, TextFormatFlags.Default, state);
  80                 }
  81
  82                 public static void DrawTextBox (Graphics g, Rectangle bounds, string comboBoxText, Font font, TextFormatFlags flags, ComboBoxState state)
  83                 {
  84                         DrawTextBox (g, bounds, comboBoxText, font, Rectangle.Empty, flags |= TextFormatFlags.VerticalCenter, state);
  85                 }
  86                 #endregion
  87
  88                 #region Private Static Methods
  89                 private static VisualStyleRenderer GetComboRenderer (ComboBoxState state)
  90                 {
  91                         switch (state) {
  92                                 case ComboBoxState.Disabled:
  93                                         return new VisualStyleRenderer (VisualStyleElement.ComboBox.DropDownButton.Disabled);
  94                                 case ComboBoxState.Hot:
  95                                         return new VisualStyleRenderer (VisualStyleElement.ComboBox.DropDownButton.Hot);
  96                                 case ComboBoxState.Normal:
  97                                 default:
  98                                         return new VisualStyleRenderer (VisualStyleElement.ComboBox.DropDownButton.Normal);
  99                                 case ComboBoxState.Pressed:
 100                                         return new VisualStyleRenderer (VisualStyleElement.ComboBox.DropDownButton.Pressed);
 101                         }
 102                 }
 103
 104                 private static VisualStyleRenderer GetTextBoxRenderer (ComboBoxState state)
 105                 {
 106                         switch (state) {
 107                                 case ComboBoxState.Disabled:
 108                                         return new VisualStyleRenderer (VisualStyleElement.TextBox.TextEdit.Disabled);
 109                                 case ComboBoxState.Hot:
 110                                         return new VisualStyleRenderer (VisualStyleElement.TextBox.TextEdit.Hot);
 111                                 case ComboBoxState.Normal:
 112                                 case ComboBoxState.Pressed:
 113                                 default:
 114                                         return new VisualStyleRenderer (VisualStyleElement.TextBox.TextEdit.Normal);
 115                         }
 116                 }
 117                 #endregion
 118
 119                 #region Public Static Properties
 120                 public static bool IsSupported {
 121                         get { return VisualStyleInformation.IsEnabledByUser && (Application.VisualStyleState == VisualStyleState.ClientAndNonClientAreasEnabled || Application.VisualStyleState == VisualStyleState.ClientAreaEnabled); }
 122                 }
 123                 #endregion
 124         }
 125 }
 126 #endif