mcs/class/System.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 using System.Drawing;
  30 using System.Windows.Forms.VisualStyles;
  31
  32 namespace System.Windows.Forms
  33 {
  34         public sealed class ComboBoxRenderer
  35         {
  36                 #region Private Constructor
  37                 private ComboBoxRenderer () { }
  38                 #endregion
  39
  40                 #region Public Static Methods
  41                 public static void DrawDropDownButton (Graphics g, Rectangle bounds, ComboBoxState state)
  42                 {
  43                         if (!IsSupported)
  44                                 throw new InvalidOperationException ();
  45
  46                         GetComboRenderer (state).DrawBackground (g, bounds);
  47                 }
  48
  49                 public static void DrawTextBox (Graphics g, Rectangle bounds, string comboBoxText, Font font, Rectangle textBounds, TextFormatFlags flags, ComboBoxState state)
  50                 {
  51                         if (!IsSupported)
  52                                 throw new InvalidOperationException ();
  53
  54                         GetTextBoxRenderer (state).DrawBackground (g, bounds);
  55
  56                         if (textBounds == Rectangle.Empty)
  57                                 textBounds = new Rectangle (bounds.Left + 3, bounds.Top, bounds.Width - 4, bounds.Height);
  58
  59                         if (comboBoxText != String.Empty)
  60                                 if (state == ComboBoxState.Disabled)
  61                                         TextRenderer.DrawText (g, comboBoxText, font, textBounds, SystemColors.GrayText, flags);
  62                                 else
  63                                         TextRenderer.DrawText (g, comboBoxText, font, textBounds, SystemColors.ControlText, flags);
  64                 }
  65
  66                 public static void DrawTextBox (Graphics g, Rectangle bounds, ComboBoxState state)
  67                 {
  68                         DrawTextBox (g, bounds, String.Empty, null, Rectangle.Empty, TextFormatFlags.VerticalCenter, state);
  69                 }
  70
  71                 public static void DrawTextBox (Graphics g, Rectangle bounds, string comboBoxText, Font font, ComboBoxState state)
  72                 {
  73                         DrawTextBox (g, bounds, comboBoxText, font, Rectangle.Empty, TextFormatFlags.VerticalCenter, state);
  74                 }
  75
  76                 public static void DrawTextBox (Graphics g, Rectangle bounds, string comboBoxText, Font font, Rectangle textBounds, ComboBoxState state)
  77                 {
  78                         DrawTextBox (g, bounds, comboBoxText, font, textBounds, TextFormatFlags.Default, state);
  79                 }
  80
  81                 public static void DrawTextBox (Graphics g, Rectangle bounds, string comboBoxText, Font font, TextFormatFlags flags, ComboBoxState state)
  82                 {
  83                         DrawTextBox (g, bounds, comboBoxText, font, Rectangle.Empty, flags |= TextFormatFlags.VerticalCenter, state);
  84                 }
  85                 #endregion
  86
  87                 #region Private Static Methods
  88                 private static VisualStyleRenderer GetComboRenderer (ComboBoxState state)
  89                 {
  90                         switch (state) {
  91                                 case ComboBoxState.Disabled:
  92                                         return new VisualStyleRenderer (VisualStyleElement.ComboBox.DropDownButton.Disabled);
  93                                 case ComboBoxState.Hot:
  94                                         return new VisualStyleRenderer (VisualStyleElement.ComboBox.DropDownButton.Hot);
  95                                 case ComboBoxState.Normal:
  96                                 default:
  97                                         return new VisualStyleRenderer (VisualStyleElement.ComboBox.DropDownButton.Normal);
  98                                 case ComboBoxState.Pressed:
  99                                         return new VisualStyleRenderer (VisualStyleElement.ComboBox.DropDownButton.Pressed);
 100                         }
 101                 }
 102
 103                 private static VisualStyleRenderer GetTextBoxRenderer (ComboBoxState state)
 104                 {
 105                         switch (state) {
 106                                 case ComboBoxState.Disabled:
 107                                         return new VisualStyleRenderer (VisualStyleElement.TextBox.TextEdit.Disabled);
 108                                 case ComboBoxState.Hot:
 109                                         return new VisualStyleRenderer (VisualStyleElement.TextBox.TextEdit.Hot);
 110                                 case ComboBoxState.Normal:
 111                                 case ComboBoxState.Pressed:
 112                                 default:
 113                                         return new VisualStyleRenderer (VisualStyleElement.TextBox.TextEdit.Normal);
 114                         }
 115                 }
 116                 #endregion
 117
 118                 #region Public Static Properties
 119                 public static bool IsSupported {
 120                         get { return VisualStyleInformation.IsEnabledByUser && (Application.VisualStyleState == VisualStyleState.ClientAndNonClientAreasEnabled || Application.VisualStyleState == VisualStyleState.ClientAreaEnabled); }
 121                 }
 122                 #endregion
 123         }
 124 }