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                 }
 109                 #endregion      // Public Constructors
 110
 111                 #region Private Methods
 112                 private void UpdateSiblings() {
 113                         Control c;
 114
 115                         if (auto_check == false) {
 116                                 return;
 117                         }
 118
 119                         // Remove tabstop property from and uncheck our radio-button siblings
 120                         c = this.parent;
 121                         if (c != null) {
 122                                 for (int i = 0; i < c.child_controls.Count; i++) {
 123                                         if ((this != c.child_controls[i]) && (c.child_controls[i] is RadioButton)) {
 124                                                 if (((RadioButton)(c.child_controls[i])).auto_check) {
 125                                                         c.child_controls[i].TabStop = false;
 126                                                         ((RadioButton)(c.child_controls[i])).Checked = false;
 127                                                 }
 128                                         }
 129                                 }
 130                         }
 131
 132                         this.TabStop = true;
 133                 }
 134
 135                 internal override void HaveDoubleClick() {
 136                         if (DoubleClick != null) DoubleClick(this, EventArgs.Empty);
 137                 }
 138
 139                 internal override void Draw (PaintEventArgs pe) {
 140                         ThemeEngine.Current.DrawRadioButton (pe.Graphics, this.ClientRectangle, this);
 141                 }
 142                 #endregion      // Private Methods
 143
 144                 #region Public Instance Properties
 145                 [DefaultValue(Appearance.Normal)]
 146                 [Localizable(true)]
 147                 public Appearance Appearance {
 148                         get {
 149                                 return appearance;
 150                         }
 151
 152                         set {
 153                                 if (value != appearance) {
 154                                         appearance = value;
 155                                         if (AppearanceChanged != null) {
 156                                                 AppearanceChanged(this, EventArgs.Empty);
 157                                         }
 158                                         Redraw();
 159                                 }
 160                         }
 161                 }
 162
 163                 [DefaultValue(true)]
 164                 public bool AutoCheck {
 165                         get {
 166                                 return auto_check;
 167                         }
 168
 169                         set {
 170                                 auto_check = value;
 171                         }
 172                 }
 173
 174                 [Bindable(true)]
 175                 [Localizable(true)]
 176                 [DefaultValue(ContentAlignment.MiddleLeft)]
 177                 public ContentAlignment CheckAlign {
 178                         get {
 179                                 return radiobutton_alignment;
 180                         }
 181
 182                         set {
 183                                 if (value != radiobutton_alignment) {
 184                                         radiobutton_alignment = value;
 185
 186                                         Redraw();
 187                                 }
 188                         }
 189                 }
 190
 191                 [DefaultValue(false)]
 192                 public bool Checked {
 193                         get {
 194                                 if (check_state != CheckState.Unchecked) {
 195                                         return true;
 196                                 }
 197                                 return false;
 198                         }
 199
 200                         set {
 201                                 if (value && (check_state != CheckState.Checked)) {
 202                                         UpdateSiblings();
 203                                         check_state = CheckState.Checked;
 204                                         Redraw();
 205                                         OnCheckedChanged(EventArgs.Empty);
 206                                 } else if (!value && (check_state != CheckState.Unchecked)) {
 207                                         check_state = CheckState.Unchecked;
 208                                         Redraw();
 209                                         OnCheckedChanged(EventArgs.Empty);
 210                                 }
 211                         }
 212                 }
 213
 214                 [DefaultValue(false)]
 215                 public new bool TabStop {
 216                         get {
 217                                 return tab_stop;
 218                         }
 219
 220                         set {
 221                                 tab_stop = value;
 222                         }
 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                         if (CheckedChanged != null) {
 280                                 CheckedChanged(this, e);
 281                         }
 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                 public event EventHandler       AppearanceChanged;
 321                 public event EventHandler       CheckedChanged;
 322
 323                 [Browsable(false)]
 324                 [EditorBrowsable (EditorBrowsableState.Never)]
 325                 public event EventHandler       DoubleClick;
 326                 #endregion      // Events
 327         }
 328 }