TextInput.cs

   1 using System;
   2 using Cairo;
   3 using Pango;
   4 using Gtk;
   5 using Gdk;
   6
   7 public class TextInputEventArgs : EventArgs {
   8         public string Value;
   9
  10         public TextInputEventArgs(string s) {
  11                 Value = s;
  12         }
  13 }
  14
  15
  16 public class TextInput : DrawingArea, IKeyPress {
  17         public string Value;
  18         protected int cursor;
  19         private string killring = null;
  20         Pango.FontDescription font;
  21
  22         public delegate void SelectHandler(object o, TextInputEventArgs s);
  23         public event SelectHandler Selected;
  24
  25         public TextInput() : this("") { }
  26
  27         public TextInput(string Value) {
  28                 this.Value = Value;
  29                 cursor = Value.Length;
  30                 font = Pango.FontDescription.FromString("Courier 12");
  31                 SetSizeRequest(-1, 12);
  32                 ModifyBg(StateType.Normal, new Gdk.Color(0xFF, 0xFF, 0xFF));
  33         }
  34
  35         protected virtual void draw (Cairo.Context gr, int width, int height) {
  36                 gr.SetSourceRGB(0,0,0);
  37                 gr.NewPath();
  38                 gr.Rectangle(new Cairo.Rectangle(0, 0, width, height));
  39                 gr.Stroke();
  40
  41                 Pango.Layout layout = new Pango.Layout(this.PangoContext);
  42                 layout.Width = Pango.Units.FromPixels(width);
  43                 layout.Alignment = Pango.Alignment.Left;
  44                 layout.FontDescription = font;
  45                 layout.SetText(Value);
  46                 Pango.CairoHelper.ShowLayout(gr, layout);
  47
  48                 gr.NewPath();
  49                 int h = Pango.Units.ToPixels(layout.FontDescription.Size) + 1;
  50                 gr.Rectangle(new Cairo.Rectangle(cursor*8, 0, 7, h));
  51                 gr.Fill();
  52         }
  53
  54         protected override bool OnExposeEvent (Gdk.EventExpose args) {
  55                 Gdk.Window win = args.Window;
  56                 Cairo.Context g = Gdk.CairoHelper.Create (args.Window);
  57
  58                 int x, y, w, h, d;
  59                 win.GetGeometry(out x, out y, out w, out h, out d);
  60
  61                 draw(g, w, h);
  62
  63                 ((IDisposable) g.Target).Dispose();
  64                 ((IDisposable) g).Dispose();
  65                 return true;
  66         }
  67
  68         [GLib.ConnectBefore ()]
  69         public virtual void KeyPress(object o, KeyPressEventArgs args) {
  70                 if ((args.Event.State & ModifierType.ControlMask) != 0) {
  71                         switch(args.Event.Key) {
  72                         case Gdk.Key.u:
  73                                 killring = Value.Substring(0, cursor);
  74                                 Value = Value.Substring(cursor);
  75                                 cursor = 0;
  76                                 break;
  77                         case Gdk.Key.k:
  78                                 killring = Value.Substring(cursor);
  79                                 Value = Value.Substring(0, cursor);
  80                                 break;
  81                         case Gdk.Key.w:
  82                                 int ws = Value.LastIndexOfAny(" ".ToCharArray());
  83                                 if (ws == -1) {
  84                                         killring = Value;
  85                                         Value = "";
  86                                 } else {
  87                                         killring = Value.Substring(ws + 1);
  88                                         Value = Value.Substring(0, ws);
  89                                 }
  90                                 cursor = Value.Length;
  91                                 break;
  92                         case Gdk.Key.y:
  93                                 if (killring == null) return;
  94                                 Value = Value.Insert(cursor, killring);
  95                                 cursor += killring.Length;
  96                                 break;
  97                         }
  98                 } else {
  99                         switch(args.Event.Key) {
 100                         case Gdk.Key.BackSpace:
 101                                 if (cursor == 0) return;
 102                                 cursor--;
 103                                 Value = Value.Remove(cursor, 1);
 104                                 break;
 105                         case Gdk.Key.Return:
 106                                 if (Selected != null) {
 107                                         TextInputEventArgs t = new TextInputEventArgs(Value);
 108                                         Selected(this, t);
 109                                         Selected = null;
 110                                 }
 111                                 break;
 112                         case Gdk.Key.Left:
 113                                 if (cursor > 0) cursor--;
 114                                 break;
 115                         case Gdk.Key.Right:
 116                                 if (cursor < Value.Length) cursor++;
 117                                 break;
 118                         case Gdk.Key.Escape:
 119                                 if (Selected != null) {
 120                                         TextInputEventArgs t = new TextInputEventArgs(null);
 121                                         Selected(this, t);
 122                                         Selected = null;
 123                                 }
 124                                 break;
 125                         default:
 126                                 if (args.Event.KeyValue > 128) return;
 127                                 Value = Value.Insert(cursor, new String((char)args.Event.KeyValue, 1));
 128                                 cursor++;
 129                                 break;
 130                         }
 131                 }
 132                 QueueDraw();
 133         }
 134 }