WindowsSpinner.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / AccessibleTech / longhorn / Automation / Win32Providers / MS / Internal / AutomationProxies / WindowsSpinner.cs / 1 / WindowsSpinner.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// 
// Description: Win32 Spinner Proxy 
//
// History: 
//              [....]
//
//---------------------------------------------------------------------------
 
using System;
using System.Collections; 
using System.Text; 
using System.ComponentModel;
using System.Windows.Automation; 
using System.Windows.Automation.Provider;
using System.Windows;
using MS.Win32;
 
namespace MS.Internal.AutomationProxies
{ 
 
    // Proxy for a Windows NumericUpDown control with Windows Edit control, called a Spinner
    class WindowsSpinner : ProxyHwnd, IRangeValueProvider 
    {

        // -----------------------------------------------------
        // 
        // Constructors
        // 
        // ----------------------------------------------------- 

        #region Constructors 

        // Contructor for WindownsSpinner class. Calls the base class constructor.
        internal WindowsSpinner(IntPtr hwndUpDown, IntPtr hwndEdit, ProxyFragment parent, int item)
            : base(hwndUpDown, parent, item) 
        {
            _elEdit = new WindowsEditBox(hwndEdit, this, 0); 
            _elUpDown = new WindowsUpDown(hwndUpDown, this, 0); 

            // Set the strings to return properly the properties. 
            _cControlType = ControlType.Spinner;

            // support for events
            _createOnEvent = new WinEventTracker.ProxyRaiseEvents(RaiseEvents); 
        }
 
        #endregion Constructors 

        #region Proxy Create 

        // Static Create method called by UIAutomation to create this proxy.
        // returns null if unsuccessful
        internal static IRawElementProviderSimple Create(IntPtr hwnd, int idChild, int idObject) 
        {
            return Create(hwnd, idChild); 
        } 

        internal static IRawElementProviderSimple Create(IntPtr hwnd, int idChild) 
        {
            // Something is wrong if idChild is not zero
            if (idChild != 0)
            { 
                System.Diagnostics.Debug.Assert (idChild == 0, "Invalid Child Id, idChild != 0");
                throw new ArgumentOutOfRangeException("idChild", idChild, SR.Get(SRID.ShouldBeZero)); 
            } 

            IntPtr hwndBuddy; 
            try
            {
                // Only use spinner class if we find a buddy that's an EDIT, otherwise return
                // null to defer to the WindowsUpDown entry in the proxy table 
                hwndBuddy = Misc.ProxySendMessage(hwnd, NativeMethods.UDM_GETBUDDY, IntPtr.Zero, IntPtr.Zero);
                if (hwndBuddy == IntPtr.Zero) 
                { 
                    return null;
                } 

                if (Misc.ProxyGetClassName(hwndBuddy).IndexOf("EDIT", StringComparison.OrdinalIgnoreCase) == -1)
                {
                    return null; 
                }
            } 
            catch (ElementNotAvailableException) 
            {
                return null; 
            }

            return new WindowsSpinner(hwnd, hwndBuddy, null, 0);
        } 

        // Static Create method called by the event tracker system 
        internal static void RaiseEvents(IntPtr hwnd, int eventId, object idProp, int idObject, int idChild) 
        {
            if (idObject == NativeMethods.OBJID_VSCROLL || idObject == NativeMethods.OBJID_HSCROLL) 
            {
                return;
            }
 
            // ChildId will be non-0 if the event is due to operating on the updown part of the spinner.
            // Events on non-content parts of a control are not necessary so don't raise an event in that case. 
            if ( idChild != 0 ) 
            {
                return; 
            }

            ProxySimple ps = (ProxySimple)Create( hwnd, idChild, idObject );
            if ( ps == null ) 
                return;
            ps.DispatchEvents( eventId, idProp, idObject, idChild ); 
        } 

        #endregion Proxy Create 

        //------------------------------------------------------
        //
        //  Patterns Implementation 
        //
        //----------------------------------------------------- 
 
        #region ProxySimple Interface
 
        // Returns a pattern interface if supported.
        internal override object GetPatternProvider (AutomationPattern iid)
        {
            return (iid == RangeValuePattern.Pattern) ? this : null; 
        }
 
        // Gets the bounding rectangle for this element 
        internal override Rect BoundingRectangle
        { 
            get
            {
                Rect rcUpDown = _elUpDown.BoundingRectangle;
                Rect rcEdit = _elEdit.BoundingRectangle; 
                return Rect.Union(rcEdit, rcUpDown);
            } 
        } 

        internal override object GetElementProperty(AutomationProperty idProp) 
        {
            if (idProp == AutomationElement.ClickablePointProperty)
            {
                return _elEdit.GetElementProperty(idProp); 
            }
            else if (idProp == AutomationElement.HasKeyboardFocusProperty) 
            { 
                return _elEdit.GetElementProperty(idProp);
            } 

            return base.GetElementProperty(idProp);
        }
 
        #endregion ProxySimple Interface
 
        #region ProxyFragment Interface 

        // Returns a Proxy element corresponding to the specified screen coordinates. 
        internal override ProxySimple ElementProviderFromPoint(int x, int y)
        {
            Rect rcUpDown = _elUpDown.BoundingRectangle;
            Rect rcEdit = _elEdit.BoundingRectangle; 
            Point pt = new Point(x, y);
 
            if (rcUpDown.Contains(pt)) 
            {
                return _elUpDown.ElementProviderFromPoint(x, y); 
            }
            else if (rcEdit.Contains(pt))
            {
                return this; 
            }
 
            return base.ElementProviderFromPoint(x, y); 
        }
 
        // Returns the next sibling element in the raw hierarchy.
        // Peripheral controls have always negative values.
        // Returns null if no next child.
        internal override ProxySimple GetNextSibling(ProxySimple child) 
        {
            return _elUpDown.GetNextSibling(child); 
        } 

        // Returns the previous sibling element in the raw hierarchy. 
        // Peripheral controls have always negative values.
        // Returns null is no previous.
        internal override ProxySimple GetPreviousSibling(ProxySimple child)
        { 
            return _elUpDown.GetPreviousSibling(child);
        } 
 
        // Returns the first child element in the raw hierarchy.
        internal override ProxySimple GetFirstChild() 
        {
            return _elUpDown.GetFirstChild();
        }
 
        // Returns the last child element in the raw hierarchy.
        internal override ProxySimple GetLastChild() 
        { 
            return _elUpDown.GetLastChild();
        } 

        #endregion

        #region RangeValue Pattern 

        // Sets a new position for the edit part of the spinner. 
        void IRangeValueProvider.SetValue (double obj) 
        {
            ((IRangeValueProvider)_elUpDown).SetValue(obj); 
        }

        // Request to get the value that this UI element is representing in a native format
        double IRangeValueProvider.Value 
        {
            get 
            { 
                return ((IRangeValueProvider)_elUpDown).Value;
            } 
        }

        bool IRangeValueProvider.IsReadOnly
        { 
            get
            { 
                return (bool)((IRangeValueProvider)_elUpDown).IsReadOnly && 
                       (bool)((IValueProvider)_elEdit).IsReadOnly;
            } 
        }

        double IRangeValueProvider.Maximum
        { 
            get
            { 
                return ((IRangeValueProvider) _elUpDown).Maximum; 
            }
        } 

        double IRangeValueProvider.Minimum
        {
            get 
            {
                return ((IRangeValueProvider) _elUpDown).Minimum; 
            } 
        }
 
        double IRangeValueProvider.SmallChange
        {
            get
            { 
                return ((IRangeValueProvider)_elUpDown).SmallChange;
            } 
        } 

        double IRangeValueProvider.LargeChange 
        {
            get
            {
                return ((IRangeValueProvider)_elUpDown).LargeChange; 
            }
        } 
        #endregion RangeValuePattern 

        // ------------------------------------------------------ 
        //
        // Internal methods
        //
        // ------------------------------------------------------ 

        #region Internal Methods 
 
        // if there is an UpDown control that its buddy window is the same as the given edit hwnd
        // the edit is part of the spinner. 
        internal static bool IsSpinnerEdit(IntPtr hwnd)
        {
            return GetUpDownFromEdit(hwnd) != IntPtr.Zero;
        } 

        // Try to find a sibling of the edit control that is an UpDown control that has the 
        // edit contol as its buddy window.  If one is found return the hwnd of the UpDown control. 
        internal static IntPtr GetUpDownFromEdit(IntPtr hwnd)
        { 
            IntPtr hwndParent = Misc.GetParent(hwnd);

            if (hwndParent != IntPtr.Zero)
            { 
                IntPtr hwndChild = Misc.GetWindow(hwndParent, NativeMethods.GW_CHILD);
                while (hwndChild != IntPtr.Zero) 
                { 
                    string className = Misc.ProxyGetClassName(hwndChild);
                    if (className.IndexOf("msctls_updown32", StringComparison.OrdinalIgnoreCase) != -1) 
                    {
                        IntPtr hwndBuddy = Misc.ProxySendMessage(hwndChild, NativeMethods.UDM_GETBUDDY, IntPtr.Zero, IntPtr.Zero);
                        if (hwnd == hwndBuddy)
                        { 
                            return hwndChild;
                        } 
                    } 
                    hwndChild = Misc.GetWindow(hwndChild, NativeMethods.GW_HWNDNEXT);
                } 
            }

            return IntPtr.Zero;
        } 

        #endregion Internal Methods 
 
        // -----------------------------------------------------
        // 
        // Private Fields
        //
        // ------------------------------------------------------
 
        #region Private Fields
 
        private WindowsEditBox _elEdit; 
        private WindowsUpDown _elUpDown;
 
        #endregion
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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