mcs/class/Managed.Windows.Forms/System.Windows.Forms/RadioButton.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
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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) 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                         TextAlign = 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 #if NET_2_0
 146                         // FIXME: This should be called every time something that can affect it
 147                         // is changed, not every paint.  Can only change so many things at a time.
 148
 149                         // Figure out where our text and image should go
 150                         Rectangle glyph_rectangle;
 151                         Rectangle text_rectangle;
 152                         Rectangle image_rectangle;
 153
 154                         ThemeEngine.Current.CalculateRadioButtonTextAndImageLayout (this, Point.Empty, out glyph_rectangle, out text_rectangle, out image_rectangle);
 155
 156                         // Draw our button
 157                         if (FlatStyle != FlatStyle.System)
 158                                 ThemeEngine.Current.DrawRadioButton (pe.Graphics, this, glyph_rectangle, text_rectangle, image_rectangle, pe.ClipRectangle);
 159                         else
 160                                 ThemeEngine.Current.DrawRadioButton (pe.Graphics, this.ClientRectangle, this);
 161 #else
 162                         ThemeEngine.Current.DrawRadioButton (pe.Graphics, this.ClientRectangle, this);
 163 #endif
 164                 }
 165
 166 #if NET_2_0
 167                 internal override Size GetPreferredSizeCore (Size proposedSize)
 168                 {
 169                         if (this.AutoSize)
 170                                 return ThemeEngine.Current.CalculateRadioButtonAutoSize (this);
 171
 172                         return base.GetPreferredSizeCore (proposedSize);
 173                 }
 174 #endif
 175                 #endregion      // Private Methods
 176
 177                 #region Public Instance Properties
 178                 [DefaultValue(Appearance.Normal)]
 179                 [Localizable(true)]
 180                 public Appearance Appearance {
 181                         get {
 182                                 return appearance;
 183                         }
 184
 185                         set {
 186                                 if (value != appearance) {
 187                                         appearance = value;
 188                                         EventHandler eh = (EventHandler)(Events [AppearanceChangedEvent]);
 189                                         if (eh != null)
 190                                                 eh (this, EventArgs.Empty);
 191                                         Invalidate();
 192                                 }
 193                         }
 194                 }
 195
 196                 [DefaultValue(true)]
 197                 public bool AutoCheck {
 198                         get {
 199                                 return auto_check;
 200                         }
 201
 202                         set {
 203                                 auto_check = value;
 204                         }
 205                 }
 206
 207 #if !NET_2_0
 208                 [Bindable(true)]
 209 #endif
 210                 [Localizable(true)]
 211                 [DefaultValue(ContentAlignment.MiddleLeft)]
 212                 public ContentAlignment CheckAlign {
 213                         get {
 214                                 return radiobutton_alignment;
 215                         }
 216
 217                         set {
 218                                 if (value != radiobutton_alignment) {
 219                                         radiobutton_alignment = value;
 220
 221                                         Invalidate();
 222                                 }
 223                         }
 224                 }
 225
 226                 [DefaultValue(false)]
 227 #if NET_2_0
 228                 [SettingsBindable (true)]
 229                 [Bindable (true, BindingDirection.OneWay)]
 230 #endif
 231                 public bool Checked {
 232                         get {
 233                                 if (check_state != CheckState.Unchecked) {
 234                                         return true;
 235                                 }
 236                                 return false;
 237                         }
 238
 239                         set {
 240                                 if (value && (check_state != CheckState.Checked)) {
 241                                         UpdateSiblings();
 242                                         check_state = CheckState.Checked;
 243                                         Invalidate();
 244                                         OnCheckedChanged(EventArgs.Empty);
 245                                 } else if (!value && (check_state != CheckState.Unchecked)) {
 246                                         check_state = CheckState.Unchecked;
 247                                         Invalidate();
 248                                         OnCheckedChanged(EventArgs.Empty);
 249                                 }
 250                         }
 251                 }
 252
 253                 [DefaultValue(false)]
 254                 public new bool TabStop {
 255                         get { return base.TabStop; }
 256                         set { base.TabStop = value; }
 257                 }
 258
 259                 [DefaultValue(ContentAlignment.MiddleLeft)]
 260                 [Localizable(true)]
 261                 public override ContentAlignment TextAlign {
 262                         get { return base.TextAlign; }
 263                         set { base.TextAlign = value; }
 264                 }
 265                 #endregion      // Public Instance Properties
 266
 267                 #region Protected Instance Properties
 268                 protected override CreateParams CreateParams {
 269                         get {
 270                                 SetStyle(ControlStyles.AllPaintingInWmPaint, true);
 271                                 SetStyle(ControlStyles.UserPaint, true);
 272
 273                                 return base.CreateParams;
 274                         }
 275                 }
 276
 277                 protected override Size DefaultSize {
 278                         get {
 279                                 return ThemeEngine.Current.RadioButtonDefaultSize;
 280                         }
 281                 }
 282                 #endregion      // Protected Instance Properties
 283
 284                 #region Public Instance Methods
 285                 public void PerformClick() {
 286                         OnClick(EventArgs.Empty);
 287                 }
 288
 289                 public override string ToString() {
 290                         return base.ToString() + ", Checked: " + this.Checked;
 291                 }
 292                 #endregion      // Public Instance Methods
 293
 294                 #region Protected Instance Methods
 295                 protected override AccessibleObject CreateAccessibilityInstance() {
 296                         AccessibleObject        ao;
 297
 298                         ao = base.CreateAccessibilityInstance ();
 299                         ao.role = AccessibleRole.RadioButton;
 300
 301                         return ao;
 302                 }
 303
 304                 protected virtual void OnCheckedChanged(EventArgs e) {
 305                         EventHandler eh = (EventHandler)(Events [CheckedChangedEvent]);
 306                         if (eh != null)
 307                                 eh (this, e);
 308                 }
 309
 310                 protected override void OnClick(EventArgs e) {
 311                         if (auto_check) {
 312                                 if (!Checked) {
 313                                         Checked = true;
 314                                 }
 315                         } else {
 316                                 Checked = !Checked;
 317                         }
 318
 319                         base.OnClick (e);
 320                 }
 321
 322                 protected override void OnEnter(EventArgs e) {
 323                         base.OnEnter(e);
 324                 }
 325
 326                 protected override void OnHandleCreated(EventArgs e) {
 327                         base.OnHandleCreated(e);
 328                 }
 329
 330                 protected override void OnMouseUp(MouseEventArgs mevent) {
 331                         base.OnMouseUp(mevent);
 332                 }
 333
 334                 protected override bool ProcessMnemonic(char charCode) {
 335                         if (IsMnemonic(charCode, Text) == true) {
 336                                 Select();
 337                                 PerformClick();
 338                                 return true;
 339                         }
 340
 341                         return base.ProcessMnemonic(charCode);
 342                 }
 343                 #endregion      // Protected Instance Methods
 344
 345                 #region Events
 346                 static object AppearanceChangedEvent = new object ();
 347                 static object CheckedChangedEvent = new object ();
 348
 349                 public event EventHandler AppearanceChanged {
 350                         add { Events.AddHandler (AppearanceChangedEvent, value); }
 351                         remove { Events.RemoveHandler (AppearanceChangedEvent, value); }
 352                 }
 353
 354                 public event EventHandler CheckedChanged {
 355                         add { Events.AddHandler (CheckedChangedEvent, value); }
 356                         remove { Events.RemoveHandler (CheckedChangedEvent, value); }
 357                 }
 358
 359                 [Browsable(false)]
 360                 [EditorBrowsable (EditorBrowsableState.Never)]
 361                 public new event EventHandler DoubleClick {
 362                         add { base.DoubleClick += value; }
 363                         remove { base.DoubleClick -= value; }
 364                 }
 365
 366 #if NET_2_0
 367                 [Browsable (false)]
 368                 [EditorBrowsable (EditorBrowsableState.Never)]
 369                 public new event MouseEventHandler MouseDoubleClick {
 370                         add { base.MouseDoubleClick += value; }
 371                         remove { base.MouseDoubleClick -= value; }
 372                 }
 373 #endif
 374                 #endregion      // Events
 375         }
 376 }