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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   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 // COMPLETE
  27
  28 using System.ComponentModel;
  29 using System.Drawing;
  30 using System.Drawing.Text;
  31 using System.Runtime.InteropServices;
  32
  33 namespace System.Windows.Forms {
  34         [DefaultProperty("Checked")]
  35         [DefaultEvent("CheckedChanged")]
  36         public class RadioButton : ButtonBase {
  37                 #region Local Variables
  38                 internal Appearance             appearance;
  39                 internal bool                   auto_check;
  40                 internal ContentAlignment       radiobutton_alignment;
  41                 internal CheckState             check_state;
  42                 #endregion      // Local Variables
  43
  44                 #region RadioButtonAccessibleObject Subclass
  45                 [ComVisible(true)]
  46                 public class RadioButtonAccessibleObject : ControlAccessibleObject {
  47                         #region RadioButtonAccessibleObject Local Variables
  48                         private RadioButton     owner;
  49                         #endregion      // RadioButtonAccessibleObject Local Variables
  50
  51                         #region RadioButtonAccessibleObject Constructors
  52                         public RadioButtonAccessibleObject(RadioButton owner) : base(owner) {
  53                                 this.owner = owner;
  54                         }
  55                         #endregion      // RadioButtonAccessibleObject Constructors
  56
  57                         #region RadioButtonAccessibleObject Properties
  58                         public override string DefaultAction {
  59                                 get {
  60                                         return "Select";
  61                                 }
  62                         }
  63
  64                         public override AccessibleRole Role {
  65                                 get {
  66                                         return AccessibleRole.RadioButton;
  67                                 }
  68                         }
  69
  70                         public override AccessibleStates State {
  71                                 get {
  72                                         AccessibleStates        retval;
  73
  74                                         retval = AccessibleStates.Default;
  75
  76                                         if (owner.check_state == CheckState.Checked) {
  77                                                 retval |= AccessibleStates.Checked;
  78                                         }
  79
  80                                         if (owner.Focused) {
  81                                                 retval |= AccessibleStates.Focused;
  82                                         }
  83
  84                                         if (owner.CanFocus) {
  85                                                 retval |= AccessibleStates.Focusable;
  86                                         }
  87
  88                                         return retval;
  89                                 }
  90                         }
  91                         #endregion      // RadioButtonAccessibleObject Properties
  92
  93                         #region RadioButtonAccessibleObject Methods
  94                         public override void DoDefaultAction() {
  95                                 owner.PerformClick();
  96                         }
  97                         #endregion      // RadioButtonAccessibleObject Methods
  98                 }
  99                 #endregion      // RadioButtonAccessibleObject Sub-class
 100
 101                 #region Public Constructors
 102                 public RadioButton() {
 103                         appearance = Appearance.Normal;
 104                         auto_check = true;
 105                         radiobutton_alignment = ContentAlignment.MiddleLeft;
 106                         text_alignment = ContentAlignment.MiddleLeft;
 107                         tab_stop = false;
 108                         GotFocus +=new EventHandler(ReceivedFocus);
 109                 }
 110                 #endregion      // Public Constructors
 111
 112                 #region Private Methods
 113                 private void UpdateSiblings() {
 114                         Control c;
 115
 116                         if (auto_check == false) {
 117                                 return;
 118                         }
 119
 120                         // Remove tabstop property from and uncheck our radio-button siblings
 121                         c = this.parent;
 122                         if (c != null) {
 123                                 for (int i = 0; i < c.child_controls.Count; i++) {
 124                                         if ((this != c.child_controls[i]) && (c.child_controls[i] is RadioButton)) {
 125                                                 if (((RadioButton)(c.child_controls[i])).auto_check) {
 126                                                         c.child_controls[i].TabStop = false;
 127                                                         ((RadioButton)(c.child_controls[i])).Checked = false;
 128                                                 }
 129                                         }
 130                                 }
 131                         }
 132
 133                         this.TabStop = true;
 134                 }
 135
 136                 internal override void HaveDoubleClick() {
 137                         if (DoubleClick != null) DoubleClick(this, EventArgs.Empty);
 138                 }
 139
 140                 internal override void Draw (PaintEventArgs pe) {
 141                         ThemeEngine.Current.DrawRadioButton (pe.Graphics, this.ClientRectangle, this);
 142                 }
 143
 144                 private void ReceivedFocus(object sender, EventArgs e) {
 145                         OnClick(e);
 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                                         if (AppearanceChanged != null) {
 161                                                 AppearanceChanged(this, EventArgs.Empty);
 162                                         }
 163                                         Redraw();
 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                 [Bindable(true)]
 180                 [Localizable(true)]
 181                 [DefaultValue(ContentAlignment.MiddleLeft)]
 182                 public ContentAlignment CheckAlign {
 183                         get {
 184                                 return radiobutton_alignment;
 185                         }
 186
 187                         set {
 188                                 if (value != radiobutton_alignment) {
 189                                         radiobutton_alignment = value;
 190
 191                                         Redraw();
 192                                 }
 193                         }
 194                 }
 195
 196                 [DefaultValue(false)]
 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 {
 222                                 return tab_stop;
 223                         }
 224
 225                         set {
 226                                 tab_stop = value;
 227                         }
 228                 }
 229
 230                 [DefaultValue(ContentAlignment.MiddleLeft)]
 231                 [Localizable(true)]
 232                 public override ContentAlignment TextAlign {
 233                         get {
 234                                 return text_alignment;
 235                         }
 236
 237                         set {
 238                                 if (value != text_alignment) {
 239                                         text_alignment = value;
 240                                         Redraw();
 241                                 }
 242                         }
 243                 }
 244                 #endregion      // Public Instance Properties
 245
 246                 #region Protected Instance Properties
 247                 protected override CreateParams CreateParams {
 248                         get {
 249                                 SetStyle(ControlStyles.AllPaintingInWmPaint, true);
 250                                 SetStyle(ControlStyles.UserPaint, true);
 251
 252                                 return base.CreateParams;
 253                         }
 254                 }
 255
 256                 protected override Size DefaultSize {
 257                         get {
 258                                 return ThemeEngine.Current.RadioButtonDefaultSize;
 259                         }
 260                 }
 261                 #endregion      // Protected Instance Properties
 262
 263                 #region Public Instance Methods
 264                 public void PerformClick() {
 265                         OnClick(EventArgs.Empty);
 266                 }
 267
 268                 public override string ToString() {
 269                         return base.ToString() + ", Checked: " + this.Checked;
 270                 }
 271                 #endregion      // Public Instance Methods
 272
 273                 #region Protected Instance Methods
 274                 protected override AccessibleObject CreateAccessibilityInstance() {
 275                         AccessibleObject        ao;
 276
 277                         ao = base.CreateAccessibilityInstance ();
 278                         ao.role = AccessibleRole.RadioButton;
 279
 280                         return ao;
 281                 }
 282
 283                 protected virtual void OnCheckedChanged(EventArgs e) {
 284                         if (CheckedChanged != null) {
 285                                 CheckedChanged(this, e);
 286                         }
 287                 }
 288
 289                 protected override void OnClick(EventArgs e) {
 290                         if (auto_check) {
 291                                 if (!Checked) {
 292                                         Checked = true;
 293                                 }
 294                         } else {
 295                                 Checked = !Checked;
 296                         }
 297
 298                         base.OnClick (e);
 299                 }
 300
 301                 protected override void OnEnter(EventArgs e) {
 302                         base.OnEnter(e);
 303                 }
 304
 305                 protected override void OnHandleCreated(EventArgs e) {
 306                         base.OnHandleCreated(e);
 307                 }
 308
 309                 protected override void OnMouseUp(MouseEventArgs mevent) {
 310                         base.OnMouseUp(mevent);
 311                 }
 312
 313                 protected override bool ProcessMnemonic(char charCode) {
 314                         if (IsMnemonic(charCode, Text) == true) {
 315                                 Select();
 316                                 PerformClick();
 317                                 return true;
 318                         }
 319
 320                         return base.ProcessMnemonic(charCode);
 321                 }
 322                 #endregion      // Protected Instance Methods
 323
 324                 #region Events
 325                 public event EventHandler       AppearanceChanged;
 326                 public event EventHandler       CheckedChanged;
 327
 328                 [Browsable(false)]
 329                 [EditorBrowsable (EditorBrowsableState.Never)]
 330                 public event EventHandler       DoubleClick;
 331                 #endregion      // Events
 332         }
 333 }