ToolStripWeb2LikeTextBox.cs

   1 using System;\r
   2 using System.ComponentModel;\r
   3 using System.Windows.Forms;\r
   4 using System.Drawing;\r
   5 \r
   6 namespace AppliStation.Util\r
   7 {\r
   8         public class ToolStripWeb2LikeTextBox : ToolStripTextBox\r
   9         {\r
  10                 public ToolStripWeb2LikeTextBox() : base()\r
  11                 {\r
  12                         this.Text = string.Empty;\r
  13                 }\r
  14                                 \r
  15                 [Category("Action")]\r
  16                 public event EventHandler TextChangedTriggerFired;\r
  17                 \r
  18                 private int textChangedTriggerInterval = 500;\r
  19                 \r
  20                 /// <summary>\r
  21                 /// Interval time for TextChangedTriggerFired.\r
  22                 /// </summary>\r
  23                 [Category("Behavior")]\r
  24                 [DefaultValue(500)]\r
  25                 public virtual int TextChangedTriggerInterval {\r
  26                         get { return textChangedTriggerInterval; }\r
  27                         set { textChangedTriggerInterval = value; }\r
  28                 }\r
  29                 \r
  30                 \r
  31                 private string oldText = null;\r
  32                 public void FireTextChangedTrigger(EventArgs e)\r
  33                 {\r
  34                         textChangeTriggerTimerStop();\r
  35                         \r
  36                         if (oldText != this.Text) {\r
  37                                 if (TextChangedTriggerFired != null) {\r
  38                                         TextChangedTriggerFired(this, e);\r
  39                                 }\r
  40                                 oldText = this.Text;\r
  41                         }\r
  42                 }\r
  43                 public void FireTextChangedTrigger()\r
  44                 {\r
  45                         FireTextChangedTrigger(EventArgs.Empty);\r
  46                 }\r
  47                 \r
  48                 #region TextChange Timers\r
  49                 \r
  50                 /// <summary>\r
  51                 /// Timer for TextChangedTriggerFired.\r
  52                 /// </summary>\r
  53                 protected Timer textChangeTriggerTimer = null;\r
  54                 \r
  55                 private void onTextUpdate(bool force)\r
  56                 {\r
  57                         textChangeTriggerTimerStop();\r
  58                         \r
  59                         textChangeTriggerTimer = new Timer();\r
  60                         textChangeTriggerTimer.Tick += textChangeTriggerTimerTick;\r
  61                         textChangeTriggerTimer.Interval = TextChangedTriggerInterval;\r
  62                         textChangeTriggerTimer.Start();\r
  63                 }\r
  64                                 \r
  65                 private void textChangeTriggerTimerTick(object sender, EventArgs e)\r
  66                 {\r
  67                         FireTextChangedTrigger(e);\r
  68                 }\r
  69                 \r
  70                 private void textChangeTriggerTimerStop()\r
  71                 {\r
  72                         if (textChangeTriggerTimer != null) {\r
  73                                 textChangeTriggerTimer.Stop();\r
  74                                 textChangeTriggerTimer = null;\r
  75                         }\r
  76                 }\r
  77                 \r
  78                 protected override void OnTextChanged(EventArgs e)\r
  79                 {\r
  80                         base.OnTextChanged(e);\r
  81                         \r
  82                         if (Focused) {\r
  83                                 onTextUpdate(false);\r
  84                         }\r
  85                 }\r
  86                 \r
  87                 #endregion\r
  88                 \r
  89                 protected bool textIsEmpty = true;\r
  90                 \r
  91                 public override string Text {\r
  92                         get { return textIsEmpty? string.Empty : base.Text; }\r
  93                         set {\r
  94                                 bool changed = false;\r
  95                                 if (string.IsNullOrEmpty(value)) {\r
  96                                         if (! textIsEmpty) {\r
  97                                                 changed = true;\r
  98                                         \r
  99                                                 textIsEmpty = true;\r
 100                                                 base.Text = EmptyText;\r
 101                                         }\r
 102                                 } else if (this.Text != value) {\r
 103                                         changed = true;\r
 104                                         \r
 105                                         textIsEmpty = false;\r
 106                                         base.Text = value;\r
 107                                 }\r
 108                                 \r
 109                                 if (changed) {\r
 110                                         FireTextChangedTrigger(EventArgs.Empty);\r
 111                                         base.OnTextChanged(EventArgs.Empty);\r
 112                                         \r
 113                                         updateForeColorInternal();\r
 114                                 }\r
 115                         }\r
 116                 }\r
 117                 \r
 118                 private string emptyText = "(none)";\r
 119                 \r
 120                 /// <summary>\r
 121                 /// Gray text when textbox is empty and has not focus\r
 122                 /// </summary>\r
 123                 [Category("Appearance")]\r
 124                 public virtual string EmptyText {\r
 125                         get { return emptyText; }\r
 126                         set {\r
 127                                 emptyText = value;\r
 128                                 \r
 129                                 if (textIsEmpty) {\r
 130                                         base.Text = emptyText;\r
 131                                 }\r
 132                         }\r
 133                 }\r
 134                 \r
 135                 private Color emptyForeColor = SystemColors.GrayText;\r
 136                 \r
 137                 /// <summary>\r
 138                 /// Gray text color when textbox is empty and has not focus\r
 139                 /// </summary>\r
 140                 [Category("Appearance")]\r
 141                 [DefaultValue(typeof(Color), "GrayText")]\r
 142                 public virtual Color EmptyForeColor {\r
 143                         get { return emptyForeColor; }\r
 144                         set {\r
 145                                 emptyForeColor = value;\r
 146                                 updateForeColorInternal();\r
 147                         }\r
 148                 }\r
 149                 \r
 150                 private Color foreColor = SystemColors.WindowText;\r
 151                 \r
 152                 public override Color ForeColor {\r
 153                         get { return foreColor; }\r
 154                         set {\r
 155                                 foreColor = value;\r
 156                                 updateForeColorInternal();\r
 157                         }\r
 158                 }\r
 159                 \r
 160                 protected override void OnEnter(EventArgs e)\r
 161                 {\r
 162                         if (textIsEmpty) {\r
 163                                 base.Text = string.Empty;\r
 164                                 textIsEmpty = false;\r
 165                                 updateForeColorInternal();\r
 166                         }\r
 167                         \r
 168                         base.OnEnter(e);\r
 169                 }\r
 170                 \r
 171                 protected override void OnLeave(EventArgs e)\r
 172                 {\r
 173                         if (string.IsNullOrEmpty(base.Text)) {\r
 174                                 base.Text = EmptyText;\r
 175                                 textIsEmpty = true;\r
 176                                 updateForeColorInternal();\r
 177                         }\r
 178                         \r
 179                         base.OnLeave(e);\r
 180                 }\r
 181                 \r
 182                 private void updateForeColorInternal()\r
 183                 {\r
 184                         base.ForeColor = textIsEmpty? EmptyForeColor : ForeColor;\r
 185                 }\r
 186         }\r
 187 }\r