class/System.Design/System.Windows.Forms.Design/AnchorEditor.cs

   1 //
   2 // System.Windows.Forms.Design.AnchorEditor.cs
   3 //
   4 //
   5 // For creating type editors see the *great* tutorial:
   6 //  "Walkthrough: implement a UI Type Editor"
   7 //
   8 // Author:
   9 //   Dennis Hayes
  10 //   Miguel de Icaza (miguel@novell.com)
  11 // (C) 2006 Novell, Inc.  http://www.ximian.com
  12 //
  13 //
  14 // Permission is hereby granted, free of charge, to any person obtaining
  15 // a copy of this software and associated documentation files (the
  16 // "Software"), to deal in the Software without restriction, including
  17 // without limitation the rights to use, copy, modify, merge, publish,
  18 // distribute, sublicense, and/or sell copies of the Software, and to
  19 // permit persons to whom the Software is furnished to do so, subject to
  20 // the following conditions:
  21 //
  22 // The above copyright notice and this permission notice shall be
  23 // included in all copies or substantial portions of the Software.
  24 //
  25 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  29 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  30 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  31 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  32 //
  33
  34 using System;
  35 using System.Drawing;
  36 using System.ComponentModel;
  37 using System.Drawing.Design;
  38 using System.Windows.Forms;
  39
  40 namespace System.Windows.Forms.Design
  41 {
  42         public sealed class AnchorEditor : UITypeEditor
  43         {
  44                 #region Public Instance Constructors
  45
  46                 public AnchorEditor()
  47                 {
  48                 }
  49
  50                 #endregion Public Instance Constructors
  51
  52                 #region Override implementation of UITypeEditor
  53
  54                 public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, Object value)
  55                 {
  56                         IWindowsFormsEditorService editor_service = null;
  57
  58                         if (provider != null){
  59                                 editor_service = provider.GetService (typeof (IWindowsFormsEditorService))
  60                                         as IWindowsFormsEditorService;
  61                         }
  62
  63                         if (editor_service != null){
  64                                 AnchorSelector anchor_selector = new AnchorSelector (editor_service, (AnchorStyles) value);
  65                                 editor_service.DropDownControl (anchor_selector);
  66
  67                                 value = anchor_selector.AnchorStyles;
  68                         }
  69
  70                         return value;
  71                 }
  72
  73                 public override UITypeEditorEditStyle GetEditStyle(ITypeDescriptorContext context)
  74                 {
  75                         return UITypeEditorEditStyle.DropDown;
  76                 }
  77
  78                 #endregion Override implementation of UITypeEditor
  79         }
  80
  81         internal class AnchorSelector : UserControl
  82         {
  83                 /// <summary>
  84                 /// Required designer variable.
  85                 /// </summary>
  86                 private System.ComponentModel.IContainer components = null;
  87
  88                 protected override void Dispose(bool disposing)
  89                 {
  90                         if (disposing && (components != null)) {
  91                                 components.Dispose();
  92                         }
  93                         base.Dispose(disposing);
  94                 }
  95
  96                 private void InitializeComponent()
  97                 {
  98                     this.SuspendLayout();
  99                     this.Name = "AnchorSelector";
 100                     this.Size = new System.Drawing.Size (150, 120);
 101                     this.ResumeLayout(false);
 102                 }
 103
 104                 public AnchorStyles AnchorStyles {
 105                         get {
 106                                 return styles;
 107                         }
 108                 }
 109
 110                 AnchorStyles styles;
 111
 112                 public AnchorSelector (IWindowsFormsEditorService editor_service, AnchorStyles startup)
 113                 {
 114                         styles = startup;
 115
 116                         InitializeComponent();
 117                         BackColor = Color.White;
 118                 }
 119
 120                 void PaintState(Graphics g, int x1, int y1, int x2, int y2, AnchorStyles v)
 121                 {
 122                         if ((styles & v) != 0)
 123                                 g.DrawLine(SystemPens.MenuText, x1, y1, x2, y2);
 124                         else {
 125                                 int xf = (x1 == x2) ? 10 : 0;
 126                                 int yf = (y1 == y2) ? 10 : 0;
 127
 128                                 g.DrawBezier(SystemPens.MenuText,
 129                                              new Point(x1, y1),
 130                                              new Point((x1+x2)/2+xf, (y1+y2)/2-yf),
 131                                              new Point((x1+x2)/2-xf, (y1+y2)/2+yf),
 132                                              new Point(x2, y2));
 133                         }
 134                 }
 135
 136                 protected override void OnPaint (PaintEventArgs e)
 137                 {
 138                         Graphics g = e.Graphics;
 139                         int w3 = Width / 3;
 140                         int h3 = Height / 3;
 141                         int w2 = Width/2;
 142                         int h2 = Height/2;
 143
 144                         g.FillRectangle(Brushes.Black, new Rectangle(w3, h3, w3, h3));
 145
 146                         PaintState (g, 0, h2, w3, h2, AnchorStyles.Left);
 147                         PaintState (g, w3 * 2, h2, Width, h2, AnchorStyles.Right);
 148                         PaintState (g, w2, 0, w2, h3, AnchorStyles.Top);
 149                         PaintState (g, w2, h3 * 2, w2, Height, AnchorStyles.Bottom);
 150                 }
 151
 152                 protected override void OnClick (EventArgs ee)
 153                 {
 154                         Point e = PointToClient (MousePosition);
 155                         int w3 = Width / 3;
 156                         int h3 = Height / 3;
 157
 158                         if (e.X <= w3 && e.Y > h3 && e.Y < h3 * 2)
 159                                 styles = styles ^ AnchorStyles.Left;
 160                         else if (e.Y < h3 && e.X > w3 && e.X < w3 * 2)
 161                                 styles = styles ^ AnchorStyles.Top;
 162                         else if (e.X > w3 * 2 && e.Y > h3 && e.Y < h3 * 2)
 163                                 styles = styles ^ AnchorStyles.Right;
 164                         else if (e.Y > h3 * 2 && e.X > w3 && e.X < w3 * 2)
 165                                 styles = styles ^ AnchorStyles.Bottom;
 166                         else
 167                                 base.OnClick(ee);
 168                         Invalidate();
 169                 }
 170
 171                 protected override void OnDoubleClick (EventArgs ee)
 172                 {
 173                         OnClick (ee);
 174                 }
 175
 176         }
 177
 178 }