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                         if (redraw) {
 142                                 ThemeEngine.Current.DrawRadioButton(this.DeviceContext, this.ClientRectangle, this);
 143                                 redraw = false;
 144                         }
 145                 }
 146 \r
 147                 private void ReceivedFocus(object sender, EventArgs e) {\r
 148                         OnClick(e);\r
 149                 }\r
 150                 #endregion      // Private Methods
 151
 152                 #region Public Instance Properties
 153                 [DefaultValue(Appearance.Normal)]
 154                 [Localizable(true)]
 155                 public Appearance Appearance {
 156                         get {
 157                                 return appearance;
 158                         }
 159
 160                         set {
 161                                 if (value != appearance) {
 162                                         appearance = value;
 163                                         if (AppearanceChanged != null) {
 164                                                 AppearanceChanged(this, EventArgs.Empty);
 165                                         }
 166                                         Redraw();
 167                                 }
 168                         }
 169                 }
 170
 171                 [DefaultValue(true)]
 172                 public bool AutoCheck {
 173                         get {
 174                                 return auto_check;
 175                         }
 176
 177                         set {
 178                                 auto_check = value;
 179                         }
 180                 }
 181
 182                 [Bindable(true)]
 183                 [Localizable(true)]
 184                 [DefaultValue(ContentAlignment.MiddleLeft)]
 185                 public ContentAlignment CheckAlign {
 186                         get {
 187                                 return radiobutton_alignment;
 188                         }
 189
 190                         set {
 191                                 if (value != radiobutton_alignment) {
 192                                         radiobutton_alignment = value;
 193
 194                                         Redraw();
 195                                 }
 196                         }
 197                 }
 198
 199                 [DefaultValue(false)]
 200                 public bool Checked {
 201                         get {
 202                                 if (check_state != CheckState.Unchecked) {
 203                                         return true;
 204                                 }
 205                                 return false;
 206                         }
 207
 208                         set {
 209                                 if (value && (check_state != CheckState.Checked)) {
 210                                         UpdateSiblings();
 211                                         check_state = CheckState.Checked;
 212                                         Redraw();
 213                                         OnCheckedChanged(EventArgs.Empty);
 214                                 } else if (!value && (check_state != CheckState.Unchecked)) {
 215                                         check_state = CheckState.Unchecked;
 216                                         Redraw();
 217                                         OnCheckedChanged(EventArgs.Empty);
 218                                 }
 219                         }
 220                 }
 221
 222                 [DefaultValue(false)]
 223                 public new bool TabStop {
 224                         get {
 225                                 return tab_stop;
 226                         }
 227
 228                         set {
 229                                 tab_stop = value;
 230                         }
 231                 }
 232
 233                 [DefaultValue(ContentAlignment.MiddleLeft)]
 234                 [Localizable(true)]
 235                 public override ContentAlignment TextAlign {
 236                         get {
 237                                 return text_alignment;
 238                         }
 239
 240                         set {
 241                                 if (value != text_alignment) {
 242                                         text_alignment = value;
 243                                         Redraw();
 244                                 }
 245                         }
 246                 }
 247                 #endregion      // Public Instance Properties
 248
 249                 #region Protected Instance Properties
 250                 protected override CreateParams CreateParams {
 251                         get {
 252                                 SetStyle(ControlStyles.AllPaintingInWmPaint, true);
 253                                 SetStyle(ControlStyles.UserPaint, true);
 254
 255                                 return base.CreateParams;
 256                         }
 257                 }
 258
 259                 protected override Size DefaultSize {
 260                         get {
 261                                 return ThemeEngine.Current.RadioButtonDefaultSize;
 262                         }
 263                 }
 264                 #endregion      // Protected Instance Properties
 265
 266                 #region Public Instance Methods
 267                 public void PerformClick() {
 268                         OnClick(EventArgs.Empty);
 269                 }
 270
 271                 public override string ToString() {
 272                         return base.ToString() + ", Checked: " + this.Checked;
 273                 }
 274                 #endregion      // Public Instance Methods
 275
 276                 #region Protected Instance Methods
 277                 protected override AccessibleObject CreateAccessibilityInstance() {
 278                         return base.CreateAccessibilityInstance ();
 279                 }
 280
 281                 protected virtual void OnCheckedChanged(EventArgs e) {
 282                         if (CheckedChanged != null) {
 283                                 CheckedChanged(this, e);
 284                         }
 285                 }
 286
 287                 protected override void OnClick(EventArgs e) {
 288                         if (auto_check) {
 289                                 if (!Checked) {
 290                                         Checked = true;
 291                                 }
 292                         } else {
 293                                 Checked = !Checked;
 294                         }
 295                 }
 296
 297                 protected override void OnEnter(EventArgs e) {
 298                         base.OnEnter(e);
 299                 }
 300
 301                 protected override void OnHandleCreated(EventArgs e) {
 302                         base.OnHandleCreated(e);
 303                 }
 304
 305                 protected override void OnMouseUp(MouseEventArgs mevent) {
 306                         base.OnMouseUp(mevent);
 307                 }
 308
 309                 protected override bool ProcessMnemonic(char charCode) {
 310                         if (IsMnemonic(charCode, Text) == true) {
 311                                 Select();
 312                                 PerformClick();
 313                                 return true;
 314                         }
 315
 316                         return base.ProcessMnemonic(charCode);
 317                 }
 318                 #endregion      // Protected Instance Methods
 319
 320                 #region Events
 321                 public event EventHandler       AppearanceChanged;
 322                 public event EventHandler       CheckedChanged;
 323
 324                 [Browsable(false)]
 325                 [EditorBrowsable (EditorBrowsableState.Never)]
 326                 public event EventHandler       DoubleClick;
 327                 #endregion      // Events\r
 328         }
 329 }