mcs/class/Managed.Windows.Forms/System.Windows.Forms/DataGridBoolColumn.cs

   1 // Permission is hereby granted, free of charge, to any person obtaining
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   3 // "Software"), to deal in the Software without restriction, including
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   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) 2005 Novell, Inc. (http://www.novell.com)
  21 //
  22 // Author:
  23 //      Jordi Mas i Hernandez <jordi@ximian.com>
  24 //
  25 //
  26
  27 // NOT COMPLETE
  28
  29 using System.ComponentModel;
  30 using System.Drawing;
  31 using System.Runtime.InteropServices;
  32 using System.Diagnostics;
  33 using System.Collections;
  34
  35 namespace System.Windows.Forms
  36 {
  37         public class DataGridBoolColumn : DataGridColumnStyle
  38         {
  39                 [Flags]
  40                 private enum CheckState {
  41                         Checked         = 0x00000001,
  42                         UnChecked       = 0x00000002,
  43                         Null            = 0x00000004,
  44                         Selected        = 0x00000008
  45                 }
  46
  47                 #region Local Variables
  48                 private bool allownull;
  49                 private object falsevalue;
  50                 private object nullvalue;
  51                 private object truevalue;
  52                 private Hashtable checkboxes_state;
  53                 CheckState oldState;
  54                 int row;
  55
  56                 #endregion      // Local Variables
  57
  58                 #region Constructors
  59                 public DataGridBoolColumn () : this (null, false)
  60                 {
  61                 }
  62
  63                 public DataGridBoolColumn (PropertyDescriptor prop) : this (prop, false)
  64                 {
  65                 }
  66
  67                 public DataGridBoolColumn (PropertyDescriptor prop, bool isDefault)  : base (prop)
  68                 {
  69                         falsevalue = false;
  70                         nullvalue = null;
  71                         truevalue = true;
  72                         allownull = true;
  73                         checkboxes_state = new Hashtable ();
  74                         is_default = isDefault;
  75                 }
  76                 #endregion
  77
  78                 #region Public Instance Properties
  79                 [DefaultValue(true)]
  80                 public bool AllowNull {
  81                         get {
  82                                 return allownull;
  83                         }
  84                         set {
  85                                 if (value != allownull) {
  86                                         allownull = value;
  87
  88                                         if (AllowNullChanged != null) {
  89                                                 AllowNullChanged (this, EventArgs.Empty);
  90                                         }
  91                                 }
  92                         }
  93                 }
  94
  95                 [TypeConverter(typeof(System.ComponentModel.StringConverter))]
  96                 public object FalseValue {
  97                         get {
  98                                 return falsevalue;
  99                         }
 100                         set {
 101                                 if (value != falsevalue) {
 102                                         falsevalue = value;
 103
 104                                         if (FalseValueChanged != null) {
 105                                                 FalseValueChanged (this, EventArgs.Empty);
 106                                         }
 107                                 }
 108                         }
 109                 }
 110
 111                 [TypeConverter(typeof(System.ComponentModel.StringConverter))]
 112                 public object NullValue {
 113                         get {
 114                                 return nullvalue;
 115                         }
 116                         set {
 117                                 if (value != nullvalue) {
 118                                         nullvalue = value;
 119                                 }
 120                         }
 121                 }
 122
 123                 [TypeConverter(typeof(System.ComponentModel.StringConverter))]
 124                 public object TrueValue {
 125                         get {
 126                                 return truevalue;
 127                         }
 128                         set {
 129                                 if (value != truevalue) {
 130                                         truevalue = value;
 131
 132                                         if (TrueValueChanged != null) {
 133                                                 TrueValueChanged (this, EventArgs.Empty);
 134                                         }
 135                                 }
 136                         }
 137                 }
 138                 #endregion      // Public Instance Properties
 139
 140                 #region Public Instance Methods
 141                 protected internal override void Abort (int rowNum)
 142                 {
 143                         SetState (rowNum, oldState & ~CheckState.Selected);
 144                         grid.Invalidate (grid.GetCurrentCellBounds ());
 145                 }
 146
 147                 protected internal override bool Commit (CurrencyManager source, int rowNum)
 148                 {
 149                         CheckState newState = GetState (source, rowNum);
 150                         SetColumnValueAtRow (source, rowNum, FromStateToValue (newState));
 151                         SetState (rowNum, newState & ~CheckState.Selected);
 152                         grid.Invalidate (grid.GetCurrentCellBounds ());
 153                         return true;
 154                 }
 155
 156                 [MonoTODO]
 157                 protected internal override void ConcedeFocus ()
 158                 {
 159                 }
 160
 161                 protected internal override void Edit (CurrencyManager source, int rowNum, Rectangle bounds, bool readOnly, string instantText,  bool cellIsVisible)
 162                 {
 163                         row = rowNum;
 164                         oldState = GetState (source, rowNum);
 165                         SetState (rowNum, oldState | CheckState.Selected);
 166                         grid.Invalidate (grid.GetCurrentCellBounds ());
 167                 }
 168
 169                 [MonoTODO]
 170                 protected internal override void EnterNullValue ()
 171                 {
 172
 173                 }
 174
 175                 private bool ValueEquals (object value, object obj)
 176                 {
 177                         return value == null ? obj == null : value.Equals (obj);
 178                 }
 179
 180                 protected internal override object GetColumnValueAtRow (CurrencyManager lm, int row)
 181                 {
 182                         object obj = base.GetColumnValueAtRow (lm, row);
 183
 184                         if (ValueEquals (nullvalue, obj)) {
 185                                 return Convert.DBNull;
 186                         }
 187
 188                         if (ValueEquals (truevalue, obj)) {
 189                                 return true;
 190                         }
 191
 192                         return false;
 193                 }
 194
 195                 protected internal override int GetMinimumHeight ()
 196                 {
 197                         return ThemeEngine.Current.DataGridMinimumColumnCheckBoxHeight;
 198                 }
 199
 200                 protected internal override int GetPreferredHeight (Graphics g, object value)
 201                 {
 202                         return ThemeEngine.Current.DataGridMinimumColumnCheckBoxHeight;
 203                 }
 204
 205                 protected internal override Size GetPreferredSize (Graphics g, object value)
 206                 {
 207                         return new Size (ThemeEngine.Current.DataGridMinimumColumnCheckBoxWidth, ThemeEngine.Current.DataGridMinimumColumnCheckBoxHeight);
 208                 }
 209
 210                 protected internal override void Paint (Graphics g, Rectangle bounds, CurrencyManager source, int rowNum)
 211                 {
 212                         Paint (g, bounds, source, rowNum, false);
 213                 }
 214
 215                 protected internal override void Paint (Graphics g, Rectangle bounds, CurrencyManager source, int rowNum, bool alignToRight)
 216                 {
 217                         Paint (g, bounds, source, rowNum, ThemeEngine.Current.ResPool.GetSolidBrush (DataGridTableStyle.BackColor),
 218                                 ThemeEngine.Current.ResPool.GetSolidBrush (DataGridTableStyle.ForeColor), alignToRight);
 219                 }
 220
 221                 protected internal override void Paint (Graphics g, Rectangle bounds, CurrencyManager source, int rowNum, Brush backBrush, Brush foreBrush, bool alignToRight)
 222                 {
 223                         Size chkbox_size = GetPreferredSize (g, null);
 224                         Rectangle rect = new Rectangle ();
 225                         ButtonState state;
 226                         CheckState check_state = GetState (source, rowNum);
 227
 228                         chkbox_size.Width -= 2;
 229                         chkbox_size.Height -= 2;
 230
 231                         rect.X = bounds.X + ((bounds.Width - chkbox_size.Width) / 2);
 232                         rect.Y = bounds.Y + ((bounds.Height - chkbox_size.Height) / 2);
 233                         rect.Width = chkbox_size.Width;
 234                         rect.Height = chkbox_size.Height;
 235
 236                         // If the cell is selected
 237                         if ((check_state & CheckState.Selected) == CheckState.Selected) {
 238                                 backBrush = ThemeEngine.Current.ResPool.GetSolidBrush (grid.SelectionBackColor);
 239                                 check_state &= ~CheckState.Selected;
 240                         }
 241
 242                         g.FillRectangle (backBrush, bounds);
 243
 244                         switch (check_state) {
 245                         case CheckState.Checked:
 246                                 state = ButtonState.Checked;
 247                                 break;
 248                         case CheckState.Null:
 249                                 state = ButtonState.Checked | ButtonState.Inactive;
 250                                 break;
 251                         case CheckState.UnChecked:
 252                         default:
 253                                 state = ButtonState.Normal;
 254                                 break;
 255                         }
 256
 257                         ThemeEngine.Current.CPDrawCheckBox (g, rect, state);
 258                         PaintGridLine (g, bounds);
 259                 }
 260
 261                 protected internal override void SetColumnValueAtRow (CurrencyManager lm, int row, object obj)
 262                 {
 263                         object value = null;
 264
 265                         if (ValueEquals (nullvalue, obj))
 266                                 value = Convert.DBNull;
 267                         else if (ValueEquals (truevalue, obj))
 268                                 value = true;
 269                         else if (ValueEquals (falsevalue, obj))
 270                                 value = false;
 271                         /* else error? */
 272
 273                         base.SetColumnValueAtRow (lm, row, value);
 274                 }
 275                 #endregion      // Public Instance Methods
 276
 277                 #region Private Instance Methods
 278                 private object FromStateToValue (CheckState state)
 279                 {
 280                         if ((state & CheckState.Checked) == CheckState.Checked)
 281                                 return truevalue;
 282                         else if ((state & CheckState.Null) == CheckState.Null)
 283                                 return nullvalue;
 284                         else
 285                                 return falsevalue;
 286                 }
 287
 288                 private CheckState FromValueToState (object obj)
 289                 {
 290                         if (ValueEquals (truevalue, obj))
 291                                 return CheckState.Checked;
 292                         else if (ValueEquals (nullvalue, obj))
 293                                 return CheckState.Null;
 294                         else
 295                                 return CheckState.UnChecked;
 296                 }
 297
 298                 private CheckState GetState (CurrencyManager source, int row)
 299                 {
 300                         CheckState state;
 301
 302                         if (checkboxes_state[row] == null) {
 303                                 object value = GetColumnValueAtRow (source, row);
 304                                 state = FromValueToState (value);
 305                                 checkboxes_state.Add (row, state);
 306                         } else {
 307                                 state = (CheckState) checkboxes_state[row];
 308                         }
 309
 310                         return state;
 311                 }
 312
 313                 private CheckState GetNextState (CheckState state)
 314                 {
 315                         CheckState new_state;
 316                         bool selected = ((state & CheckState.Selected) == CheckState.Selected);
 317
 318                         switch (state & ~CheckState.Selected) {
 319                         case CheckState.Checked:
 320                                 new_state = CheckState.Null;
 321                                 break;
 322                         case CheckState.Null:
 323                                 new_state = CheckState.UnChecked;
 324                                 break;
 325                         case CheckState.UnChecked:
 326                         default:
 327                                 new_state = CheckState.Checked;
 328                                 break;
 329                         }
 330
 331                         if (selected) {
 332                                 new_state = new_state | CheckState.Selected;
 333                         }
 334
 335                         return new_state;
 336                 }
 337
 338                 internal override void OnKeyDown (KeyEventArgs ke, int row, int column)
 339                 {
 340                         switch (ke.KeyCode) {
 341                         case Keys.Space:
 342                                 NextState (row, column);
 343                                 break;
 344                         }
 345                 }
 346
 347                 internal override void OnMouseDown (MouseEventArgs e, int row, int column)
 348                 {
 349                         this.row = row;
 350                         NextState (row, column);
 351                 }
 352
 353                 private void NextState (int row, int column)
 354                 {
 355                         grid.ColumnStartedEditing (new Rectangle());
 356
 357                         SetState (row, GetNextState (GetState (null, row)));
 358
 359                         grid.Invalidate (grid.GetCellBounds (row, column));
 360                 }
 361
 362                 private void SetState (int row, CheckState state)
 363                 {
 364                         checkboxes_state[row] = state;
 365                 }
 366
 367                 #endregion Private Instance Methods
 368
 369                 #region Events
 370                 public event EventHandler AllowNullChanged;
 371                 public event EventHandler FalseValueChanged;
 372                 public event EventHandler TrueValueChanged;
 373                 #endregion      // Events
 374         }
 375 }