mcs/class/Managed.Windows.Forms/System.Windows.Forms/CheckBox.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) 2004 Novell, Inc.
  21 //
  22 // Authors:
  23 //      Dennis Hayes    dennish@raytek.com
  24 //      Peter Bartok    pbartok@novell.com
  25 //
  26
  27 // COMPLETE
  28
  29 using System;
  30 using System.ComponentModel;
  31 using System.Drawing;
  32
  33 namespace System.Windows.Forms {
  34         [DefaultProperty("Checked")]
  35         [DefaultEvent("CheckedChanged")]
  36         public class CheckBox : ButtonBase {
  37                 #region Local Variables
  38                 internal Appearance             appearance;
  39                 internal bool                   auto_check;
  40                 internal ContentAlignment       check_alignment;
  41                 internal CheckState             check_state;
  42                 internal bool                   three_state;
  43                 #endregion      // Local Variables
  44
  45
  46                 #region Public Constructors
  47                 public CheckBox() {
  48                         appearance = Appearance.Normal;
  49                         auto_check = true;
  50                         check_alignment = ContentAlignment.MiddleLeft;
  51                         text_alignment = ContentAlignment.MiddleLeft;
  52                 }
  53                 #endregion      // Public Constructors
  54
  55                 #region Internal Methods
  56                 internal override void Draw (PaintEventArgs pe) {
  57                         if (redraw) {
  58                                 ThemeEngine.Current.DrawCheckBox (this.DeviceContext, this.ClientRectangle, this);
  59                                 redraw = false;
  60                         }
  61                 }
  62
  63                 internal override void HaveDoubleClick() {
  64                         if (DoubleClick != null) DoubleClick(this, EventArgs.Empty);
  65                 }
  66                 #endregion      // Internal Methods
  67
  68                 #region Public Instance Properties
  69                 [DefaultValue(Appearance.Normal)]
  70                 [Localizable(true)]
  71                 public Appearance Appearance {
  72                         get {
  73                                 return appearance;
  74                         }
  75
  76                         set {
  77                                 if (value != appearance) {
  78                                         appearance = value;
  79                                         if (AppearanceChanged != null) {
  80                                                 AppearanceChanged(this, EventArgs.Empty);
  81                                         }
  82                                         Redraw();
  83                                 }
  84                         }
  85                 }
  86
  87                 [DefaultValue(true)]
  88                 public bool AutoCheck {
  89                         get {
  90                                 return auto_check;
  91                         }
  92
  93                         set {
  94                                 auto_check = value;
  95                         }
  96                 }
  97
  98                 [Bindable(true)]
  99                 [Localizable(true)]
 100                 [DefaultValue(ContentAlignment.MiddleLeft)]
 101                 public ContentAlignment CheckAlign {
 102                         get {
 103                                 return check_alignment;
 104                         }
 105
 106                         set {
 107                                 if (value != check_alignment) {
 108                                         check_alignment = value;
 109
 110                                         Redraw();
 111                                 }
 112                         }
 113                 }
 114
 115                 [Bindable(true)]
 116                 [RefreshProperties(RefreshProperties.All)]
 117                 [DefaultValue(false)]
 118                 public bool Checked {
 119                         get {
 120                                 if (check_state != CheckState.Unchecked) {
 121                                         return true;
 122                                 }
 123                                 return false;
 124                         }
 125
 126                         set {
 127                                 if (value && (check_state != CheckState.Checked)) {
 128                                         check_state = CheckState.Checked;
 129                                         Redraw();
 130                                         OnCheckedChanged(EventArgs.Empty);
 131                                 } else if (!value && (check_state != CheckState.Unchecked)) {
 132                                         check_state = CheckState.Unchecked;
 133                                         Redraw();
 134                                         OnCheckedChanged(EventArgs.Empty);
 135                                 }
 136                         }
 137                 }
 138
 139                 [DefaultValue(CheckState.Unchecked)]
 140                 [RefreshProperties(RefreshProperties.All)]
 141                 [Bindable(true)]
 142                 public CheckState CheckState {
 143                         get {
 144                                 return check_state;
 145                         }
 146
 147                         set {
 148                                 if (value != check_state) {
 149                                         bool    was_checked = (check_state != CheckState.Unchecked);
 150
 151                                         check_state = value;
 152
 153                                         if (was_checked != (check_state != CheckState.Unchecked)) {
 154                                                 OnCheckedChanged(EventArgs.Empty);
 155                                         }
 156
 157                                         OnCheckStateChanged(EventArgs.Empty);
 158                                         Redraw();
 159                                 }
 160                         }
 161                 }
 162
 163                 [DefaultValue(ContentAlignment.MiddleLeft)]
 164                 [Localizable(true)]
 165                 public override ContentAlignment TextAlign {
 166                         get {
 167                                 return text_alignment;
 168                         }
 169
 170                         set {
 171                                 if (value != text_alignment) {
 172                                         text_alignment = value;
 173                                         Redraw();
 174                                 }
 175                         }
 176                 }
 177
 178
 179                 [DefaultValue(false)]
 180                 public bool ThreeState {
 181                         get {
 182                                 return three_state;
 183                         }
 184
 185                         set {
 186                                 three_state = value;
 187                         }
 188                 }
 189                 #endregion      // Public Instance Properties
 190
 191                 #region Protected Instance Properties
 192                 protected override CreateParams CreateParams {
 193                         get {
 194                                 return base.CreateParams;
 195                         }
 196                 }
 197
 198                 protected override Size DefaultSize {
 199                         get {
 200                                 return new Size(104, 24);
 201                         }
 202                 }
 203                 #endregion      // Protected Instance Properties
 204
 205                 #region Public Instance Methods
 206                 public override string ToString() {
 207                         return base.ToString() + ", CheckState: " + (int)check_state;
 208                 }
 209                 #endregion      // Public Instance Methods
 210
 211                 #region Protected Instance Methods
 212                 protected override AccessibleObject CreateAccessibilityInstance() {
 213                         return base.CreateAccessibilityInstance ();
 214                 }
 215
 216                 protected virtual void OnAppearanceChanged(EventArgs e) {
 217                         if (AppearanceChanged != null) {
 218                                 AppearanceChanged(this, e);
 219                         }
 220                 }
 221
 222                 protected virtual void OnCheckedChanged(EventArgs e) {
 223                         if (CheckedChanged != null) {
 224                                 CheckedChanged(this, e);
 225                         }
 226                 }
 227
 228                 protected virtual void OnCheckStateChanged(EventArgs e) {
 229                         if (CheckStateChanged != null) {
 230                                 CheckStateChanged(this, e);
 231                         }
 232                 }
 233
 234                 protected override void OnClick(EventArgs e) {
 235                         if (auto_check) {
 236                                 switch(check_state) {
 237                                         case CheckState.Unchecked: {
 238                                                 if (three_state) {
 239                                                         CheckState = CheckState.Indeterminate;
 240                                                 } else {
 241                                                         CheckState = CheckState.Checked;
 242                                                 }
 243                                                 break;
 244                                         }
 245
 246                                         case CheckState.Indeterminate: {
 247                                                 CheckState = CheckState.Checked;
 248                                                 break;
 249                                         }
 250
 251                                         case CheckState.Checked: {
 252                                                 CheckState = CheckState.Unchecked;
 253                                                 break;
 254                                         }
 255                                 }
 256                         }
 257                 }
 258
 259                 protected override void OnHandleCreated(EventArgs e) {
 260                         base.OnHandleCreated (e);
 261                 }
 262
 263                 protected override void OnMouseUp(MouseEventArgs e) {
 264                         base.OnMouseUp (e);
 265                 }
 266
 267                 protected override bool ProcessMnemonic(char charCode) {
 268                         return base.ProcessMnemonic (charCode);
 269                 }
 270                 #endregion      // Protected Instance Methods
 271
 272                 #region Events
 273                 public event EventHandler       AppearanceChanged;
 274                 public event EventHandler       CheckedChanged;
 275                 public event EventHandler       CheckStateChanged;
 276                 #endregion      // Events
 277
 278                 #region Events
 279                 [Browsable(false)]
 280                 [EditorBrowsable (EditorBrowsableState.Never)]
 281                 public event EventHandler DoubleClick;
 282                 #endregion      // Events
 283         }
 284 }