CheckBox.cs source code in C# .NET

                        
Code:
                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / CheckBox.cs / 1 / CheckBox.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

/* 
 */ 
namespace System.Windows.Forms {
    using System.Runtime.Serialization.Formatters; 
    using System.Runtime.Remoting;
    using System.Runtime.InteropServices;

    using System.Diagnostics; 

    using System; 
    using System.Security.Permissions; 
    using System.Windows.Forms.ButtonInternal;
 
    using System.ComponentModel;
    using System.ComponentModel.Design;
    using System.Windows.Forms.Layout;
 
    using System.Drawing;
    using System.Windows.Forms.Internal; 
    using System.Drawing.Drawing2D; 
    using Microsoft.Win32;
    using System.Globalization; 

    /// 
    /// 
    ///     Represents a Windows 
    ///       check box.
    ///  
    [ 
    ComVisible(true),
    ClassInterface(ClassInterfaceType.AutoDispatch), 
    DefaultProperty("Checked"),
    DefaultEvent("CheckedChanged"),
    DefaultBindingProperty("CheckState"),
    ToolboxItem("System.Windows.Forms.Design.AutoSizeToolboxItem," + AssemblyRef.SystemDesign), 
    SRDescription(SR.DescriptionCheckBox)
    ] 
    public class CheckBox : ButtonBase { 
        private static readonly object EVENT_CHECKEDCHANGED = new object();
        private static readonly object EVENT_CHECKSTATECHANGED = new object(); 
        private static readonly object EVENT_APPEARANCECHANGED = new object();
        static readonly ContentAlignment anyRight  = ContentAlignment.TopRight | ContentAlignment.MiddleRight | ContentAlignment.BottomRight;

        private bool autoCheck; 
        private bool threeState;
        private bool accObjDoDefaultAction = false; 
 
        private ContentAlignment checkAlign = ContentAlignment.MiddleLeft;
        private CheckState checkState; 
        private Appearance appearance;

        /// 
        ///  
        ///    
        ///       Initializes a new instance of the  class. 
        ///     
        /// 
        public CheckBox() 
        : base() {

            // Checkboxes shouldn't respond to right clicks, so we need to do all our own click logic
            SetStyle(ControlStyles.StandardClick | 
                     ControlStyles.StandardDoubleClick, false);
 
            SetAutoSizeMode(AutoSizeMode.GrowAndShrink); 

            autoCheck = true; 
            TextAlign = ContentAlignment.MiddleLeft;

        }
 
        private bool AccObjDoDefaultAction {
            get { 
                return this.accObjDoDefaultAction; 
            }
            set { 
                this.accObjDoDefaultAction = value;
            }
        }
 
        /// 
        ///  
        ///    Gets 
        ///       or sets the value that determines the appearance of a
        ///       check box control. 
        /// 
        [
        DefaultValue(Appearance.Normal),
        Localizable(true), 
        SRCategory(SR.CatAppearance),
        SRDescription(SR.CheckBoxAppearanceDescr) 
        ] 
        public Appearance Appearance {
            get { 
                return appearance;
            }

            set { 
                //valid values are 0x0 to 0x1
                if (!ClientUtils.IsEnumValid(value, (int)value, (int)Appearance.Normal, (int)Appearance.Button)){ 
                    throw new InvalidEnumArgumentException("value", (int)value, typeof(Appearance)); 
                }
 
                if (appearance != value) {
                    using (LayoutTransaction.CreateTransactionIf(AutoSize, this.ParentInternal, this, PropertyNames.Appearance)) {
                        appearance = value;
                        if (OwnerDraw) { 
                            Refresh();
                        } 
                        else { 
                            UpdateStyles();
                        } 
                        OnAppearanceChanged(EventArgs.Empty);
                    }
                }
            } 
        }
 
        ///  
        /// 
        ///    [To be supplied.] 
        /// 
        [SRCategory(SR.CatPropertyChanged), SRDescription(SR.CheckBoxOnAppearanceChangedDescr)]
        public event EventHandler AppearanceChanged {
            add { 
                Events.AddHandler(EVENT_APPEARANCECHANGED, value);
            } 
            remove { 
                Events.RemoveHandler(EVENT_APPEARANCECHANGED, value);
            } 
        }

        /// 
        ///  
        /// Gets or sets a value indicating whether the  or 
        /// value and the check box's appearance are automatically 
        /// changed when it is clicked. 
        /// 
        [ 
        DefaultValue(true),
        SRCategory(SR.CatBehavior),
        SRDescription(SR.CheckBoxAutoCheckDescr)
        ] 
        public bool AutoCheck {
            get { 
                return autoCheck; 
            }
 
            set {
                autoCheck = value;
            }
        } 

        ///  
        ///  
        ///    
        ///       Gets or sets 
        ///       the horizontal and vertical alignment of a check box on a check box
        ///       control.
        ///
        ///     
        /// 
        [ 
        Bindable(true), 
        Localizable(true),
        SRCategory(SR.CatAppearance), 
        DefaultValue(ContentAlignment.MiddleLeft),
        SRDescription(SR.CheckBoxCheckAlignDescr)
        ]
        public ContentAlignment CheckAlign { 
            get {
                return checkAlign; 
            } 
            set {
                if (!WindowsFormsUtils.EnumValidator.IsValidContentAlignment(value)) { 
                    throw new InvalidEnumArgumentException("value", (int)value, typeof(ContentAlignment));
                }

                if (checkAlign != value) { 
                    checkAlign = value;
                    LayoutTransaction.DoLayoutIf(AutoSize, ParentInternal, this, PropertyNames.CheckAlign); 
                    if (OwnerDraw) { 
                        Invalidate();
                    } 
                    else {
                        UpdateStyles();
                    }
                } 
            }
        } 
 
        /// 
        ///  
        ///    
        ///       Gets
        ///       or sets a value indicating whether the
        ///       check box 
        ///       is checked.
        ///     
        ///  
        [
        Bindable(true), 
        SettingsBindable(true),
        DefaultValue(false),
        SRCategory(SR.CatAppearance),
        RefreshProperties(RefreshProperties.All), 
        SRDescription(SR.CheckBoxCheckedDescr)
        ] 
        public bool Checked { 
            get {
                return checkState != CheckState.Unchecked; 
            }

            set {
                if (value != Checked) { 
                    CheckState = value ? CheckState.Checked : CheckState.Unchecked;
                } 
            } 
        }
 
        /// 
        /// 
        ///    Gets
        ///       or sets a value indicating whether the check box is checked. 
        /// 
        [ 
        Bindable(true), 
        SRCategory(SR.CatAppearance),
        DefaultValue(CheckState.Unchecked), 
        RefreshProperties(RefreshProperties.All),
        SRDescription(SR.CheckBoxCheckStateDescr)
        ]
        public CheckState CheckState { 
            get {
                return checkState; 
            } 

            set { 
                // valid values are 0-2 inclusive.
                if (!ClientUtils.IsEnumValid(value, (int)value, (int)CheckState.Unchecked, (int)CheckState.Indeterminate)){
                    throw new InvalidEnumArgumentException("value", (int)value, typeof(CheckState));
                } 

                if (checkState != value) { 
 
                    bool oldChecked = Checked;
 
                    checkState = value;

                    if (IsHandleCreated) {
                        SendMessage(NativeMethods.BM_SETCHECK, (int)checkState, 0); 
                    }
 
                    if (oldChecked != Checked) { 
                        OnCheckedChanged(EventArgs.Empty);
                    } 
                    OnCheckStateChanged(EventArgs.Empty);
                }
            }
        } 

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

        ///  
        /// 
        [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]
        public new event MouseEventHandler MouseDoubleClick {
            add { 
                base.MouseDoubleClick += value;
            } 
            remove { 
                base.MouseDoubleClick -= value;
            } 
        }

        /// 
        ///  
        /// 
        ///     
        ///       Gets the information used to create the handle for the 
        ///    
        ///    control. 
        /// 
        /// 
        protected override CreateParams CreateParams {
            [SecurityPermission(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.UnmanagedCode)] 
            get {
                CreateParams cp = base.CreateParams; 
                cp.ClassName = "BUTTON"; 
                if (OwnerDraw) {
                    cp.Style |= NativeMethods.BS_OWNERDRAW; 
                }
                else {
                    cp.Style |= NativeMethods.BS_3STATE;
                    if (Appearance == Appearance.Button) { 
                        cp.Style |= NativeMethods.BS_PUSHLIKE;
                    } 
 
                    // Determine the alignment of the check box
                    // 
                    ContentAlignment align = RtlTranslateContent(CheckAlign);
                    if ((int)(align & anyRight) != 0) {
                        cp.Style |= NativeMethods.BS_RIGHTBUTTON;
                    } 

                } 
 
                return cp;
            } 
        }

        /// 
        ///  
        ///     Deriving classes can override this to configure a default size for their control.
        ///     This is more efficient than setting the size in the control's constructor. 
        ///  
        protected override Size DefaultSize {
            get { 
                return new Size(104, 24);
            }
        }
 
        internal override Size GetPreferredSizeCore(Size proposedConstraints) {
            if (Appearance == Appearance.Button) { 
                ButtonStandardAdapter adapter = new ButtonStandardAdapter(this); 
                return adapter.GetPreferredSizeCore(proposedConstraints);
            } 

            if(FlatStyle != FlatStyle.System) {
                return base.GetPreferredSizeCore(proposedConstraints);
            } 

            Size textSize = TextRenderer.MeasureText(this.Text, this.Font); 
            Size size = SizeFromClientSize(textSize); 
            size.Width += 25;
            size.Height += 5; 
            return size + Padding.Size;
        }

        ///  
        /// 
        ///  
        ///  
        internal override Rectangle OverChangeRectangle {
            get { 
                if (Appearance == Appearance.Button) {
                    return base.OverChangeRectangle;
                }
                else { 
                    if (FlatStyle == FlatStyle.Standard) {
                        // this Rectangle will cause no Invalidation 
                        // can't use Rectangle.Empty because it will cause Invalidate(ClientRectangle) 
                        return new Rectangle(-1, -1, 1, 1);
                    } 
                    else {
                        // Popup mouseover rectangle is actually bigger than GetCheckmarkRectangle
                        return Adapter.CommonLayout().Layout().checkBounds;
                    } 
                }
            } 
        } 

        ///  
        /// 
        /// 
        /// 
        internal override Rectangle DownChangeRectangle { 
            get {
                if (Appearance == Appearance.Button || FlatStyle == FlatStyle.System) { 
                    return base.DownChangeRectangle; 
                }
                else { 
                    // Popup mouseover rectangle is actually bigger than GetCheckmarkRectangle()
                    return Adapter.CommonLayout().Layout().checkBounds;
                }
            } 
        }
 
        ///  
        /// 
        ///  
        ///    
        ///       Gets or sets a value indicating the alignment of the
        ///       text on the checkbox control.
        /// 
        ///    
        ///  
        [ 
        Localizable(true),
        DefaultValue(ContentAlignment.MiddleLeft) 
        ]
        public override ContentAlignment TextAlign {
            get {
                return base.TextAlign; 
            }
            set { 
                base.TextAlign = value; 
            }
        } 

        /// 
        /// 
        ///    Gets or sets a value indicating 
        ///       whether the check box will allow three check states rather than two.
        ///  
        [ 
        DefaultValue(false),
        SRCategory(SR.CatBehavior), 
        SRDescription(SR.CheckBoxThreeStateDescr)
        ]
        public bool ThreeState {
            get { 
                return threeState;
            } 
            set { 
                threeState = value;
            } 
        }

        /// 
        ///  
        ///    Occurs when the
        ///       value of the  
        ///       property changes. 
        /// 
        [SRDescription(SR.CheckBoxOnCheckedChangedDescr)] 
        public event EventHandler CheckedChanged {
            add {
                Events.AddHandler(EVENT_CHECKEDCHANGED, value);
            } 
            remove {
                Events.RemoveHandler(EVENT_CHECKEDCHANGED, value); 
            } 
        }
 
        /// 
        /// 
        ///    Occurs when the
        ///       value of the  
        ///       property changes.
        ///  
        [SRDescription(SR.CheckBoxOnCheckStateChangedDescr)] 
        public event EventHandler CheckStateChanged {
            add { 
                Events.AddHandler(EVENT_CHECKSTATECHANGED, value);
            }
            remove {
                Events.RemoveHandler(EVENT_CHECKSTATECHANGED, value); 
            }
        } 
 
        /// 
        ///  
        /// 
        ///    
        ///       Constructs the new instance of the accessibility object for this control. Subclasses
        ///       should not call base.CreateAccessibilityObject. 
        ///    
        ///  
        protected override AccessibleObject CreateAccessibilityInstance() { 
            return new CheckBoxAccessibleObject(this);
        } 

        /// 
        /// 
        ///    [To be supplied.] 
        /// 
        protected virtual void OnAppearanceChanged(EventArgs e) { 
            EventHandler eh = Events[EVENT_APPEARANCECHANGED] as EventHandler; 
            if (eh != null) {
                 eh(this, e); 
            }
        }

        ///  
        /// 
        /// Raises the  
        /// event. 
        /// 
        protected virtual void OnCheckedChanged(EventArgs e) { 
            // accessibility stuff
            if (this.FlatStyle == FlatStyle.System) {
                AccessibilityNotifyClients(AccessibleEvents.SystemCaptureStart, -1);
            } 

            AccessibilityNotifyClients(AccessibleEvents.StateChange, -1); 
            AccessibilityNotifyClients(AccessibleEvents.NameChange, -1); 

            if (this.FlatStyle == FlatStyle.System) { 
                AccessibilityNotifyClients(AccessibleEvents.SystemCaptureEnd, -1);
            }

            EventHandler handler = (EventHandler)Events[EVENT_CHECKEDCHANGED]; 
            if (handler != null) handler(this,e);
        } 
 
        /// 
        ///  
        /// Raises the  event.
        /// 
        protected virtual void OnCheckStateChanged(EventArgs e) {
            if (OwnerDraw) { 
                Refresh();
            } 
 
            EventHandler handler = (EventHandler)Events[EVENT_CHECKSTATECHANGED];
            if (handler != null) handler(this,e); 
        }

        /// 
        ///  
        /// 
        ///     
        ///       Fires the event indicating that the control has been clicked. 
        ///       Inheriting controls should use this in favour of actually listening to
        ///       the event, but should not forget to call base.onClicked() to 
        ///       ensure that the event is still fired for external listeners.
        ///
        ///    
        ///  
        protected override void OnClick(EventArgs e) {
            if (autoCheck) { 
                switch (CheckState) { 
                    case CheckState.Unchecked:
                        CheckState = CheckState.Checked; 
                        break;
                    case CheckState.Checked:
                        if (threeState) {
                            CheckState = CheckState.Indeterminate; 

                            // If the check box is clicked as a result of AccObj::DoDefaultAction 
                            // then the native check box does not fire OBJ_STATE_CHANGE event when going to Indeterminate state. 
                            // So the WinForms layer fires the OBJ_STATE_CHANGE event.
                            // vsw 543351. 
                            if (this.AccObjDoDefaultAction) {
                                AccessibilityNotifyClients(AccessibleEvents.StateChange, -1);
                            }
                        } 
                        else {
                            CheckState = CheckState.Unchecked; 
                        } 
                        break;
                    default: 
                        CheckState = CheckState.Unchecked;
                        break;
                }
            } 
            base.OnClick(e);
        } 
 
        /// 
        ///  
        ///     We override this to ensure that the control's click values are set up
        ///     correctly.
        /// 
        ///  
        protected override void OnHandleCreated(EventArgs e) {
            base.OnHandleCreated(e); 
 
            // Since this is a protected override...
            // this can be directly called in by a overriden class.. 
            // and the Handle need not be created...
            // So Check for the handle
            if (IsHandleCreated) {
                SendMessage(NativeMethods.BM_SETCHECK, (int)checkState, 0); 
            }
        } 
 
        /// 
        ///     We override this to ensure that press '+' or '=' checks the box, 
        ///     while pressing '-' unchecks the box
        /// 
        /// 
        protected override void OnKeyDown(KeyEventArgs e) { 
            //this fixes bug 235019, but it will be a breaking change from Everett
            //see the comments attached to bug 235019 
            /* 
            if (Enabled) {
                if (e.KeyCode == Keys.Oemplus || e.KeyCode == Keys.Add) { 
                    CheckState = CheckState.Checked;
                }
                if (e.KeyCode == Keys.OemMinus || e.KeyCode == Keys.Subtract) {
                    CheckState = CheckState.Unchecked; 
                }
            } 
            */ 
            base.OnKeyDown(e);
        } 

        /// 
        /// 
        ///  
        ///    
        ///       Raises the  event. 
        /// 
        ///    
        ///  
        protected override void OnMouseUp(MouseEventArgs mevent) {
            if (mevent.Button == MouseButtons.Left && MouseIsPressed) {
                // It's best not to have the mouse captured while running Click events
                if (base.MouseIsDown) { 
                    Point pt = PointToScreen(new Point(mevent.X, mevent.Y));
                    if (UnsafeNativeMethods.WindowFromPoint(pt.X, pt.Y) == Handle) { 
                        //Paint in raised state... 
                        ResetFlagsandPaint();
                        if (!ValidationCancelled) { 
                            if (this.Capture) {
                                OnClick(mevent);
                            }
                            OnMouseClick(mevent); 
                        }
                    } 
                } 
            }
            base.OnMouseUp(mevent); 
        }

        internal override ButtonBaseAdapter CreateFlatAdapter() {
            return new CheckBoxFlatAdapter(this); 
        }
 
        internal override ButtonBaseAdapter CreatePopupAdapter() { 
            return new CheckBoxPopupAdapter(this);
        } 

        internal override ButtonBaseAdapter CreateStandardAdapter() {
            return new CheckBoxStandardAdapter(this);
        } 

        ///  
        ///  
        ///     Overridden to handle mnemonics properly.
        ///  
        /// 
        [UIPermission(SecurityAction.LinkDemand, Window=UIPermissionWindow.AllWindows)]
        protected internal override bool ProcessMnemonic(char charCode) {
            if (UseMnemonic && IsMnemonic(charCode, Text) && CanSelect) { 
                if (FocusInternal()) {
                    //Paint in raised state... 
                    // 
                    ResetFlagsandPaint();
                    if (!ValidationCancelled) { 
                        OnClick(EventArgs.Empty);
                    }

                } 
                return true;
            } 
            return false; 
        }
 
        /// 
        /// 
        ///     Provides some interesting information for the CheckBox control in
        ///     String form. 
        /// 
        ///  
        public override string ToString() { 

            string s = base.ToString(); 
            // C#R cpb: 14744 ([....]) We shouldn't need to convert the enum to int -- EE M10 workitem.
            int checkState = (int)CheckState;
            return s + ", CheckState: " + checkState.ToString(CultureInfo.InvariantCulture);
        } 

        ///  
        ///  
        /// 
        ///  
        [System.Runtime.InteropServices.ComVisible(true)]
        public class CheckBoxAccessibleObject : ButtonBaseAccessibleObject {

            ///  
            /// 
            ///    [To be supplied.] 
            ///  
            public CheckBoxAccessibleObject(Control owner) : base(owner) {
            } 

            /// 
            /// 
            ///    [To be supplied.] 
            /// 
            public override string DefaultAction { 
                get { 
                    string defaultAction = Owner.AccessibleDefaultActionDescription;
                    if (defaultAction != null) { 
                        return defaultAction;
                    }

                    if (((CheckBox)Owner).Checked) { 
                        return SR.GetString(SR.AccessibleActionUncheck);
                    } 
                    else { 
                        return SR.GetString(SR.AccessibleActionCheck);
                    } 
                }
            }

            ///  
            /// 
            ///    [To be supplied.] 
            ///  
            public override AccessibleRole Role {
                get { 
                    AccessibleRole role = Owner.AccessibleRole;
                    if (role != AccessibleRole.Default) {
                        return role;
                    } 
                    return AccessibleRole.CheckButton;
                } 
            } 

            ///  
            /// 
            ///    [To be supplied.]
            /// 
            public override AccessibleStates State { 
                get {
                    switch (((CheckBox)Owner).CheckState) { 
                        case CheckState.Checked: 
                            return AccessibleStates.Checked | base.State;
                        case CheckState.Indeterminate: 
                            return AccessibleStates.Indeterminate | base.State;
                    }

                    return base.State; 
                }
            } 
 
            /// 
            ///  
            ///    [To be supplied.]
            /// 
            [SecurityPermission(SecurityAction.Demand, Flags = SecurityPermissionFlag.UnmanagedCode)]
            public override void DoDefaultAction() { 
                CheckBox cb = this.Owner as CheckBox;
 
                if (cb != null) { 
                    cb.AccObjDoDefaultAction = true;
                } 

                try {
                    base.DoDefaultAction();
                } finally { 
                    if (cb != null) {
                        cb.AccObjDoDefaultAction = false; 
                    } 
                }
 
            }
        }
    }
} 


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// Copyright (c) Microsoft Corporation. All rights reserved.


                        

                        

                        
                        

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