mcs/class/Managed.Windows.Forms/System.Windows.Forms.Theming/Default/LinkLabelPainter.cs

   1 // Permission is hereby granted, free of charge, to any person obtaining
   2 // a copy of this software and associated documentation files (the
   3 // "Software"), to deal in the Software without restriction, including
   4 // without limitation the rights to use, copy, modify, merge, publish,
   5 // distribute, sublicense, and/or sell copies of the Software, and to
   6 // permit persons to whom the Software is furnished to do so, subject to
   7 // the following conditions:
   8 //
   9 // The above copyright notice and this permission notice shall be
  10 // included in all copies or substantial portions of the Software.
  11 //
  12 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  13 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  14 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  15 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  16 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  17 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  18 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  19 //
  20 // Copyright (c) 2007 Novell, Inc.
  21 //
  22 // Authors:
  23 //      Everaldo Canuto (ecanuto@novell.com)
  24
  25 using System;
  26 using System.Drawing;
  27 using System.Drawing.Drawing2D;
  28
  29 namespace System.Windows.Forms.Theming.Default
  30 {
  31         internal class LinkLabelPainter
  32         {
  33                 public LinkLabelPainter ()
  34                 {
  35                 }
  36
  37                 private Color GetPieceColor (LinkLabel label, LinkLabel.Piece piece, int i)
  38                 {
  39                         if (!label.Enabled)
  40                                 return label.DisabledLinkColor;
  41
  42                         if (piece.link == null)
  43                                 return label.ForeColor;
  44
  45                         if (!piece.link.Enabled)
  46                                 return label.DisabledLinkColor;
  47
  48                         if (piece.link.Active)
  49                                 return label.ActiveLinkColor;
  50
  51                         if ((label.LinkVisited && i == 0) || piece.link.Visited)
  52                                 return label.VisitedLinkColor;
  53
  54                         return label.LinkColor;
  55                 }
  56
  57                 public virtual void Draw (Graphics dc, Rectangle clip_rectangle, LinkLabel label)
  58                 {
  59                         Rectangle client_rect = label.PaddingClientRectangle;
  60
  61                         label.DrawImage (dc, label.Image, client_rect, label.ImageAlign);
  62
  63                         if (label.pieces == null)
  64                                 return;
  65
  66                         // Paint all text as disabled.
  67                         if (!label.Enabled) {
  68                                 dc.SetClip (clip_rectangle);
  69                                 ThemeEngine.Current.CPDrawStringDisabled (
  70                                         dc, label.Text, label.Font, label.BackColor, client_rect, label.string_format);
  71                                 return;
  72                         }
  73
  74                         Font font, link_font = ThemeEngine.Current.GetLinkFont (label);
  75
  76                         Region text_region = new Region (new Rectangle());
  77
  78                         // Draw links.
  79                         for (int i = 0; i < label.pieces.Length; i ++) {
  80                                 LinkLabel.Piece piece = label.pieces[i];
  81
  82                                 if (piece.link == null) {
  83                                         text_region.Union (piece.region);
  84                                         continue;
  85                                 }
  86
  87                                 Color color = GetPieceColor (label, piece, i);
  88
  89                                 if ( (label.LinkBehavior == LinkBehavior.AlwaysUnderline) ||
  90                                          (label.LinkBehavior == LinkBehavior.SystemDefault) ||
  91                                          ((label.LinkBehavior == LinkBehavior.HoverUnderline) && piece.link.Hovered) )
  92                                         font = link_font;
  93                                 else
  94                                         font = label.Font;
  95
  96                                 dc.Clip = piece.region;
  97                                 dc.Clip.Intersect (clip_rectangle);
  98                                 dc.DrawString (label.Text, font,
  99                                                 ThemeEngine.Current.ResPool.GetSolidBrush (color),
 100                                                 client_rect, label.string_format);
 101
 102                                 // Draw focus rectangle
 103                                 if ((piece.link != null) && piece.link.Focused) {
 104                                         foreach (RectangleF rect in piece.region.GetRegionScans (dc.Transform))
 105                                                 ControlPaint.DrawFocusRectangle (dc, Rectangle.Round (rect), label.ForeColor, label.BackColor);
 106                                 }
 107                         }
 108
 109                         // Draw normal text (without links).
 110                         if (!text_region.IsEmpty (dc)) {
 111                                 dc.Clip = text_region;
 112                                 dc.Clip.Intersect (clip_rectangle);
 113                                 if (!dc.Clip.IsEmpty (dc))
 114                                         dc.DrawString(label.Text, label.Font,
 115                                                 ThemeEngine.Current.ResPool.GetSolidBrush(label.ForeColor),
 116                                                 client_rect, label.string_format);
 117                         }
 118                 }
 119         }
 120 }