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