In System.Windows.Forms:

[mono-project.git] / mcs / class / Managed.Windows.Forms / System.Windows.Forms / RadioButton.cs

// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
// Copyright (c) 2004-2005 Novell, Inc.
//
// Authors:
//      Peter Bartok    pbartok@novell.com
//

// COMPLETE

using System.ComponentModel;
using System.Drawing;
using System.Drawing.Text;
using System.Runtime.InteropServices;

namespace System.Windows.Forms {
        [DefaultProperty("Checked")]
        [DefaultEvent("CheckedChanged")]
        public class RadioButton : ButtonBase {
                #region Local Variables
                internal Appearance             appearance;
                internal bool                   auto_check;
                internal ContentAlignment       radiobutton_alignment;
                internal CheckState             check_state;
                #endregion      // Local Variables

                #region RadioButtonAccessibleObject Subclass
                [ComVisible(true)]
                public class RadioButtonAccessibleObject : ControlAccessibleObject {
                        #region RadioButtonAccessibleObject Local Variables
                        private RadioButton     owner;
                        #endregion      // RadioButtonAccessibleObject Local Variables

                        #region RadioButtonAccessibleObject Constructors
                        public RadioButtonAccessibleObject(RadioButton owner) : base(owner) {
                                this.owner = owner;
                        }
                        #endregion      // RadioButtonAccessibleObject Constructors

                        #region RadioButtonAccessibleObject Properties
                        public override string DefaultAction {
                                get {
                                        return "Select";
                                }
                        }

                        public override AccessibleRole Role {
                                get {
                                        return AccessibleRole.RadioButton;
                                }
                        }

                        public override AccessibleStates State {
                                get {
                                        AccessibleStates        retval;

                                        retval = AccessibleStates.Default;

                                        if (owner.check_state == CheckState.Checked) {
                                                retval |= AccessibleStates.Checked;
                                        }

                                        if (owner.Focused) {
                                                retval |= AccessibleStates.Focused;
                                        }

                                        if (owner.CanFocus) {
                                                retval |= AccessibleStates.Focusable;
                                        }

                                        return retval;
                                }
                        }
                        #endregion      // RadioButtonAccessibleObject Properties

                        #region RadioButtonAccessibleObject Methods
                        public override void DoDefaultAction() {
                                owner.PerformClick();
                        }
                        #endregion      // RadioButtonAccessibleObject Methods
                }
                #endregion      // RadioButtonAccessibleObject Sub-class

                #region Public Constructors
                public RadioButton() {
                        appearance = Appearance.Normal;
                        auto_check = true;
                        radiobutton_alignment = ContentAlignment.MiddleLeft;
                        text_alignment = ContentAlignment.MiddleLeft;
                        TabStop = false;
                }
                #endregion      // Public Constructors

                #region Private Methods
                private void UpdateSiblings() {
                        Control c;

                        if (auto_check == false) {
                                return;
                        }

                        // Remove tabstop property from and uncheck our radio-button siblings
                        c = this.Parent;
                        if (c != null) {
                                for (int i = 0; i < c.Controls.Count; i++) {
                                        if ((this != c.Controls[i]) && (c.Controls[i] is RadioButton)) {
                                                if (((RadioButton)(c.Controls[i])).auto_check) {
                                                        c.Controls[i].TabStop = false;
                                                        ((RadioButton)(c.Controls[i])).Checked = false;
                                                }
                                        }
                                }
                        }

                        this.TabStop = true;
                }

                internal override void Draw (PaintEventArgs pe) {
                        ThemeEngine.Current.DrawRadioButton (pe.Graphics, this.ClientRectangle, this);
                }
                #endregion      // Private Methods

                #region Public Instance Properties
                [DefaultValue(Appearance.Normal)]
                [Localizable(true)]
                public Appearance Appearance {
                        get {
                                return appearance;
                        }

                        set {
                                if (value != appearance) {
                                        appearance = value;
                                        EventHandler eh = (EventHandler)(Events [AppearanceChangedEvent]);
                                        if (eh != null)
                                                eh (this, EventArgs.Empty);
                                        Redraw();
                                }
                        }
                }

                [DefaultValue(true)]
                public bool AutoCheck {
                        get {
                                return auto_check;
                        }

                        set {
                                auto_check = value;
                        }
                }

                [Bindable(true)]
                [Localizable(true)]
                [DefaultValue(ContentAlignment.MiddleLeft)]
                public ContentAlignment CheckAlign {
                        get {
                                return radiobutton_alignment;
                        }

                        set {
                                if (value != radiobutton_alignment) {
                                        radiobutton_alignment = value;

                                        Redraw();
                                }
                        }
                }

                [DefaultValue(false)]
                public bool Checked {
                        get {
                                if (check_state != CheckState.Unchecked) {
                                        return true;
                                }
                                return false;
                        }

                        set {
                                if (value && (check_state != CheckState.Checked)) {
                                        UpdateSiblings();
                                        check_state = CheckState.Checked;
                                        Redraw();
                                        OnCheckedChanged(EventArgs.Empty);
                                } else if (!value && (check_state != CheckState.Unchecked)) {
                                        check_state = CheckState.Unchecked;
                                        Redraw();
                                        OnCheckedChanged(EventArgs.Empty);
                                }
                        }
                }

                [DefaultValue(false)]
                public new bool TabStop {
                        get { return base.TabStop; }
                        set { base.TabStop = value; }
                }

                [DefaultValue(ContentAlignment.MiddleLeft)]
                [Localizable(true)]
                public override ContentAlignment TextAlign {
                        get {
                                return text_alignment;
                        }

                        set {
                                if (value != text_alignment) {
                                        text_alignment = value;
                                        Redraw();
                                }
                        }
                }
                #endregion      // Public Instance Properties

                #region Protected Instance Properties
                protected override CreateParams CreateParams {
                        get {
                                SetStyle(ControlStyles.AllPaintingInWmPaint, true);
                                SetStyle(ControlStyles.UserPaint, true);

                                return base.CreateParams;
                        }
                }

                protected override Size DefaultSize {
                        get {
                                return ThemeEngine.Current.RadioButtonDefaultSize;
                        }
                }
                #endregion      // Protected Instance Properties

                #region Public Instance Methods
                public void PerformClick() {
                        OnClick(EventArgs.Empty);
                }

                public override string ToString() {
                        return base.ToString() + ", Checked: " + this.Checked;
                }
                #endregion      // Public Instance Methods

                #region Protected Instance Methods
                protected override AccessibleObject CreateAccessibilityInstance() {
                        AccessibleObject        ao;

                        ao = base.CreateAccessibilityInstance ();
                        ao.role = AccessibleRole.RadioButton;

                        return ao;
                }

                protected virtual void OnCheckedChanged(EventArgs e) {
                        EventHandler eh = (EventHandler)(Events [CheckedChangedEvent]);
                        if (eh != null)
                                eh (this, e);
                }

                protected override void OnClick(EventArgs e) {
                        if (auto_check) {
                                if (!Checked) {
                                        Checked = true;
                                }
                        } else {
                                Checked = !Checked;
                        }
                        
                        base.OnClick (e);
                }

                protected override void OnEnter(EventArgs e) {
                        base.OnEnter(e);
                }

                protected override void OnHandleCreated(EventArgs e) {
                        base.OnHandleCreated(e);
                }

                protected override void OnMouseUp(MouseEventArgs mevent) {
                        base.OnMouseUp(mevent);
                }

                protected override bool ProcessMnemonic(char charCode) {
                        if (IsMnemonic(charCode, Text) == true) {
                                Select();
                                PerformClick();
                                return true;
                        }
                        
                        return base.ProcessMnemonic(charCode);
                }
                #endregion      // Protected Instance Methods

                #region Events
                static object AppearanceChangedEvent = new object ();
                static object CheckedChangedEvent = new object ();

                public event EventHandler AppearanceChanged {
                        add { Events.AddHandler (AppearanceChangedEvent, value); }
                        remove { Events.RemoveHandler (AppearanceChangedEvent, value); }
                }

                public event EventHandler CheckedChanged {
                        add { Events.AddHandler (CheckedChangedEvent, value); }
                        remove { Events.RemoveHandler (CheckedChangedEvent, value); }
                }

                [Browsable(false)]
                [EditorBrowsable (EditorBrowsableState.Never)]
                public new event EventHandler DoubleClick {
                        add { base.DoubleClick += value; }
                        remove { base.DoubleClick -= value; }
                }
                #endregion      // Events
        }
}