mcs/class/Managed.Windows.Forms/System.Windows.Forms/RadioButton.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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   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) 2004-2005 Novell, Inc.
  21 //
  22 // Authors:
  23 //      Peter Bartok    pbartok@novell.com
  24 //
  25
  26 using System.ComponentModel;
  27 using System.Drawing;
  28 using System.Drawing.Text;
  29 using System.Runtime.InteropServices;
  30
  31 namespace System.Windows.Forms {
  32         [DefaultProperty("Checked")]
  33         [DefaultEvent("CheckedChanged")]
  34 #if NET_2_0
  35         [ClassInterface (ClassInterfaceType.AutoDispatch)]
  36         [ComVisible (true)]
  37         [DefaultBindingProperty ("Checked")]
  38         [ToolboxItem ("System.Windows.Forms.Design.AutoSizeToolboxItem," + Consts.AssemblySystem_Design)]
  39         [Designer ("System.Windows.Forms.Design.RadioButtonDesigner, " + Consts.AssemblySystem_Design)]
  40 #endif
  41         public class RadioButton : ButtonBase {
  42                 #region Local Variables
  43                 internal Appearance             appearance;
  44                 internal bool                   auto_check;
  45                 internal ContentAlignment       radiobutton_alignment;
  46                 internal CheckState             check_state;
  47                 #endregion      // Local Variables
  48
  49                 #region RadioButtonAccessibleObject Subclass
  50                 [ComVisible(true)]
  51 #if NET_2_0
  52                 public class RadioButtonAccessibleObject : ButtonBaseAccessibleObject {
  53 #else
  54                 public class RadioButtonAccessibleObject : ControlAccessibleObject {
  55 #endif
  56                         #region RadioButtonAccessibleObject Local Variables
  57                         private new RadioButton owner;
  58                         #endregion      // RadioButtonAccessibleObject Local Variables
  59
  60                         #region RadioButtonAccessibleObject Constructors
  61                         public RadioButtonAccessibleObject(RadioButton owner) : base(owner) {
  62                                 this.owner = owner;
  63                         }
  64                         #endregion      // RadioButtonAccessibleObject Constructors
  65
  66                         #region RadioButtonAccessibleObject Properties
  67                         public override string DefaultAction {
  68                                 get {
  69                                         return "Select";
  70                                 }
  71                         }
  72
  73                         public override AccessibleRole Role {
  74                                 get {
  75                                         return AccessibleRole.RadioButton;
  76                                 }
  77                         }
  78
  79                         public override AccessibleStates State {
  80                                 get {
  81                                         AccessibleStates        retval;
  82
  83                                         retval = AccessibleStates.Default;
  84
  85                                         if (owner.check_state == CheckState.Checked) {
  86                                                 retval |= AccessibleStates.Checked;
  87                                         }
  88
  89                                         if (owner.Focused) {
  90                                                 retval |= AccessibleStates.Focused;
  91                                         }
  92
  93                                         if (owner.CanFocus) {
  94                                                 retval |= AccessibleStates.Focusable;
  95                                         }
  96
  97                                         return retval;
  98                                 }
  99                         }
 100                         #endregion      // RadioButtonAccessibleObject Properties
 101
 102                         #region RadioButtonAccessibleObject Methods
 103                         public override void DoDefaultAction() {
 104                                 owner.PerformClick();
 105                         }
 106                         #endregion      // RadioButtonAccessibleObject Methods
 107                 }
 108                 #endregion      // RadioButtonAccessibleObject Sub-class
 109
 110                 #region Public Constructors
 111                 public RadioButton() {
 112                         appearance = Appearance.Normal;
 113                         auto_check = true;
 114                         radiobutton_alignment = ContentAlignment.MiddleLeft;
 115                         text_alignment = ContentAlignment.MiddleLeft;
 116                         TabStop = false;
 117                 }
 118                 #endregion      // Public Constructors
 119
 120                 #region Private Methods
 121                 private void UpdateSiblings() {
 122                         Control c;
 123
 124                         if (auto_check == false) {
 125                                 return;
 126                         }
 127
 128                         // Remove tabstop property from and uncheck our radio-button siblings
 129                         c = this.Parent;
 130                         if (c != null) {
 131                                 for (int i = 0; i < c.Controls.Count; i++) {
 132                                         if ((this != c.Controls[i]) && (c.Controls[i] is RadioButton)) {
 133                                                 if (((RadioButton)(c.Controls[i])).auto_check) {
 134                                                         c.Controls[i].TabStop = false;
 135                                                         ((RadioButton)(c.Controls[i])).Checked = false;
 136                                                 }
 137                                         }
 138                                 }
 139                         }
 140
 141                         this.TabStop = true;
 142                 }
 143
 144                 internal override void Draw (PaintEventArgs pe) {
 145                         ThemeEngine.Current.DrawRadioButton (pe.Graphics, this.ClientRectangle, this);
 146                 }
 147                 #endregion      // Private Methods
 148
 149                 #region Public Instance Properties
 150                 [DefaultValue(Appearance.Normal)]
 151                 [Localizable(true)]
 152                 public Appearance Appearance {
 153                         get {
 154                                 return appearance;
 155                         }
 156
 157                         set {
 158                                 if (value != appearance) {
 159                                         appearance = value;
 160                                         EventHandler eh = (EventHandler)(Events [AppearanceChangedEvent]);
 161                                         if (eh != null)
 162                                                 eh (this, EventArgs.Empty);
 163                                         Invalidate();
 164                                 }
 165                         }
 166                 }
 167
 168                 [DefaultValue(true)]
 169                 public bool AutoCheck {
 170                         get {
 171                                 return auto_check;
 172                         }
 173
 174                         set {
 175                                 auto_check = value;
 176                         }
 177                 }
 178
 179 #if !NET_2_0
 180                 [Bindable(true)]
 181 #endif
 182                 [Localizable(true)]
 183                 [DefaultValue(ContentAlignment.MiddleLeft)]
 184                 public ContentAlignment CheckAlign {
 185                         get {
 186                                 return radiobutton_alignment;
 187                         }
 188
 189                         set {
 190                                 if (value != radiobutton_alignment) {
 191                                         radiobutton_alignment = value;
 192
 193                                         Invalidate();
 194                                 }
 195                         }
 196                 }
 197
 198                 [DefaultValue(false)]
 199 #if NET_2_0
 200                 [SettingsBindable (true)]
 201                 [Bindable (true, BindingDirection.OneWay)]
 202 #endif
 203                 public bool Checked {
 204                         get {
 205                                 if (check_state != CheckState.Unchecked) {
 206                                         return true;
 207                                 }
 208                                 return false;
 209                         }
 210
 211                         set {
 212                                 if (value && (check_state != CheckState.Checked)) {
 213                                         UpdateSiblings();
 214                                         check_state = CheckState.Checked;
 215                                         Invalidate();
 216                                         OnCheckedChanged(EventArgs.Empty);
 217                                 } else if (!value && (check_state != CheckState.Unchecked)) {
 218                                         check_state = CheckState.Unchecked;
 219                                         Invalidate();
 220                                         OnCheckedChanged(EventArgs.Empty);
 221                                 }
 222                         }
 223                 }
 224
 225                 [DefaultValue(false)]
 226                 public new bool TabStop {
 227                         get { return base.TabStop; }
 228                         set { base.TabStop = value; }
 229                 }
 230
 231                 [DefaultValue(ContentAlignment.MiddleLeft)]
 232                 [Localizable(true)]
 233                 public override ContentAlignment TextAlign {
 234                         get {
 235                                 return text_alignment;
 236                         }
 237
 238                         set {
 239                                 if (value != text_alignment) {
 240                                         text_alignment = value;
 241                                         Invalidate();
 242                                 }
 243                         }
 244                 }
 245                 #endregion      // Public Instance Properties
 246
 247                 #region Protected Instance Properties
 248                 protected override CreateParams CreateParams {
 249                         get {
 250                                 SetStyle(ControlStyles.AllPaintingInWmPaint, true);
 251                                 SetStyle(ControlStyles.UserPaint, true);
 252
 253                                 return base.CreateParams;
 254                         }
 255                 }
 256
 257                 protected override Size DefaultSize {
 258                         get {
 259                                 return ThemeEngine.Current.RadioButtonDefaultSize;
 260                         }
 261                 }
 262                 #endregion      // Protected Instance Properties
 263
 264                 #region Public Instance Methods
 265                 public void PerformClick() {
 266                         OnClick(EventArgs.Empty);
 267                 }
 268
 269                 public override string ToString() {
 270                         return base.ToString() + ", Checked: " + this.Checked;
 271                 }
 272                 #endregion      // Public Instance Methods
 273
 274                 #region Protected Instance Methods
 275                 protected override AccessibleObject CreateAccessibilityInstance() {
 276                         AccessibleObject        ao;
 277
 278                         ao = base.CreateAccessibilityInstance ();
 279                         ao.role = AccessibleRole.RadioButton;
 280
 281                         return ao;
 282                 }
 283
 284                 protected virtual void OnCheckedChanged(EventArgs e) {
 285                         EventHandler eh = (EventHandler)(Events [CheckedChangedEvent]);
 286                         if (eh != null)
 287                                 eh (this, e);
 288                 }
 289
 290                 protected override void OnClick(EventArgs e) {
 291                         if (auto_check) {
 292                                 if (!Checked) {
 293                                         Checked = true;
 294                                 }
 295                         } else {
 296                                 Checked = !Checked;
 297                         }
 298
 299                         base.OnClick (e);
 300                 }
 301
 302                 protected override void OnEnter(EventArgs e) {
 303                         base.OnEnter(e);
 304                 }
 305
 306                 protected override void OnHandleCreated(EventArgs e) {
 307                         base.OnHandleCreated(e);
 308                 }
 309
 310                 protected override void OnMouseUp(MouseEventArgs mevent) {
 311                         base.OnMouseUp(mevent);
 312                 }
 313
 314                 protected override bool ProcessMnemonic(char charCode) {
 315                         if (IsMnemonic(charCode, Text) == true) {
 316                                 Select();
 317                                 PerformClick();
 318                                 return true;
 319                         }
 320
 321                         return base.ProcessMnemonic(charCode);
 322                 }
 323                 #endregion      // Protected Instance Methods
 324
 325                 #region Events
 326                 static object AppearanceChangedEvent = new object ();
 327                 static object CheckedChangedEvent = new object ();
 328
 329                 public event EventHandler AppearanceChanged {
 330                         add { Events.AddHandler (AppearanceChangedEvent, value); }
 331                         remove { Events.RemoveHandler (AppearanceChangedEvent, value); }
 332                 }
 333
 334                 public event EventHandler CheckedChanged {
 335                         add { Events.AddHandler (CheckedChangedEvent, value); }
 336                         remove { Events.RemoveHandler (CheckedChangedEvent, value); }
 337                 }
 338
 339                 [Browsable(false)]
 340                 [EditorBrowsable (EditorBrowsableState.Never)]
 341                 public new event EventHandler DoubleClick {
 342                         add { base.DoubleClick += value; }
 343                         remove { base.DoubleClick -= value; }
 344                 }
 345
 346 #if NET_2_0
 347                 [Browsable (false)]
 348                 [EditorBrowsable (EditorBrowsableState.Never)]
 349                 public new event MouseEventHandler MouseDoubleClick {
 350                         add { base.MouseDoubleClick += value; }
 351                         remove { base.MouseDoubleClick -= value; }
 352                 }
 353 #endif
 354                 #endregion      // Events
 355         }
 356 }