WindowsSlider.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 / WindowsSlider.cs / 1 / WindowsSlider.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// 
// Description: Slider Proxy 
//
// History: 
//              Kris Krueger (krisk)    Created
//              a-jeanp                 Entirely revised
//
//--------------------------------------------------------------------------- 

using System; 
using System.Text; 
using System.Collections;
using System.Runtime.InteropServices; 
using System.ComponentModel;
using System.Windows.Automation;
using System.Windows.Automation.Provider;
using System.Windows; 
using MS.Win32;
 
namespace MS.Internal.AutomationProxies 
{
    class WindowsSlider: ProxyHwnd, IRangeValueProvider 
    {

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

        #region Constructors 

        WindowsSlider (IntPtr hwnd, ProxyFragment parent, int item)
            : base (hwnd, parent, item )
        { 
            _fHorizontal = IsHorizontalSlider ();
            _fIsKeyboardFocusable = true; 
 
            // Set the strings to return properly the properties.
            _cControlType = ControlType.Slider; 

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

        #endregion 
 
        #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);
        } 
 
        private 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));
            } 
 
            return new WindowsSlider(hwnd, null, idChild);
        } 

        // 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)
            { 
                WindowsSlider wtv = new WindowsSlider (hwnd, null, 0); 

                wtv.DispatchEvents (eventId, idProp, idObject, idChild); 
            }
        }

        #endregion 

        //------------------------------------------------------ 
        // 
        //  Patterns Implementation
        // 
        //-----------------------------------------------------

        #region ProxySimple Interface
 
        // Returns a pattern interface if supported.
        internal override object GetPatternProvider (AutomationPattern iid) 
        { 
            return iid == RangeValuePattern.Pattern ? this : null;
        } 

        // Process all the Logical and Raw Element Properties
        internal override object GetElementProperty(AutomationProperty idProp)
        { 
            if (idProp == AutomationElement.OrientationProperty)
            { 
                return IsVerticalSlider() ? OrientationType.Vertical : OrientationType.Horizontal; 
            }
 
            return base.GetElementProperty(idProp);
        }

        #endregion 

        #region ProxyFragment Interface 
 
        // 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)
        {
            SItem item = (SItem)(child._item + 1); 

            return item <= SItem.LargeIncrement ? CreateSliderItem (item) : null; 
        } 

        // 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)
        { 
            SItem item = (SItem)(child._item - 1);
 
            return item >= SItem.LargeDecrement ? CreateSliderItem (item) : null; 
        }
 
        // Returns the first child element in the raw hierarchy.
        internal override ProxySimple GetFirstChild ()
        {
            return CreateSliderItem (SItem.LargeDecrement); 
        }
 
        // Returns the last child element in the raw hierarchy. 
        internal override ProxySimple GetLastChild ()
        { 
            return CreateSliderItem (SItem.LargeIncrement);
        }

        // Returns a Proxy element corresponding to the specified screen coordinates. 
        internal override ProxySimple ElementProviderFromPoint (int x, int y)
        { 
            for (SItem item = SItem.LargeDecrement; (int) item <= (int) SItem.LargeIncrement; item = (SItem) ((int) item + 1)) 
            {
                NativeMethods.Win32Rect rc = new NativeMethods.Win32Rect (SliderItem.GetBoundingRectangle (_hwnd, item, _fHorizontal)); 

                if (Misc.PtInRect(ref rc, x, y))
                {
                    return CreateSliderItem (item); 
                }
            } 
 
            return null;
        } 

        #endregion

        #region RangeValue Pattern 

        // Sets a new position for the Slider. 
        void IRangeValueProvider.SetValue (double val) 
        {
            // Make sure that the control is enabled 
            if (!SafeNativeMethods.IsWindowEnabled(_hwnd))
            {
                throw new ElementNotEnabledException();
            } 

            // bug# 15533, Set value does not accept float 
            int newVal = Convert.ToInt32 (val); 

            SetSliderValue (newVal); 

            // bug# 15531, Set value of slider control needs to notify parent of change
            IntPtr parent = Misc.GetParent(_hwnd);
 
            if (IntPtr.Zero != parent)
            { 
                // Horizontal sliders update parent with WM_HSCROLL, vertical with WM_VSCROLL 
                int msg = IsHorizontalSlider () ? NativeMethods.WM_HSCROLL : NativeMethods.WM_VSCROLL;
 
                // New position
                int wParam = (newVal << 16) | NativeMethods.SB_THUMBPOSITION;

                // Notify parent of new position 
                Misc.ProxySendMessage(parent, msg, new IntPtr(wParam), IntPtr.Zero);
            } 
        } 

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

        bool IRangeValueProvider.IsReadOnly 
        {
            get
            {
                return false; 
            }
        } 
 

        double IRangeValueProvider.Maximum 
        {
            get
            {
                return (double)Max; 
            }
        } 
 
        double IRangeValueProvider.Minimum
        { 
            get
            {
                return (double)Min;
            } 
        }
 
        double IRangeValueProvider.SmallChange 
        {
            get 
            {
                return (double)LineSize;
            }
        } 

        double IRangeValueProvider.LargeChange 
        { 
            get
            { 
                double pageSize = (double)PageSize;
                return PageSize != 0.0 ? pageSize : (double)LineSize;
            }
        } 

        #endregion 
 
        // ------------------------------------------------------
        // 
        // Private methods
        //
        // ------------------------------------------------------
 
        #region Private Methods
 
        private ProxySimple CreateSliderItem (SItem item) 
        {
            return new SliderItem (_hwnd, this, (int) item, _fHorizontal); 
        }

        private bool IsHorizontalSlider ()
        { 
            return (!IsVerticalSlider ());
        } 
 
        private bool IsVerticalSlider ()
        { 
            return (Misc.IsBitSet(WindowStyle, NativeMethods.TBS_VERT));
        }

        private int GetSliderValue () 
        {
            return Misc.ProxySendMessageInt(_hwnd, NativeMethods.TBM_GETPOS, IntPtr.Zero, IntPtr.Zero); 
        } 

        private void SetSliderValue (int val) 
        {
            // check for the range
            if (val > Max)
            { 
                throw new ArgumentOutOfRangeException("value", val, SR.Get(SRID.RangeValueMax));
            } 
            else if (val < Min) 
            {
                throw new ArgumentOutOfRangeException("value", val, SR.Get(SRID.RangeValueMin)); 
            }

            Misc.ProxySendMessage(_hwnd, NativeMethods.TBM_SETPOS, new IntPtr(1), new IntPtr(val));
        } 

        private int LineSize 
        { 
            get
            { 
                return Misc.ProxySendMessageInt(_hwnd, NativeMethods.TBM_GETLINESIZE, IntPtr.Zero, IntPtr.Zero);
            }
        }
 
        private int Min
        { 
            get 
            {
                return Misc.ProxySendMessageInt(_hwnd, NativeMethods.TBM_GETRANGEMIN, IntPtr.Zero, IntPtr.Zero); 
            }
        }

        private int Max 
        {
            get 
            { 
                return Misc.ProxySendMessageInt(_hwnd, NativeMethods.TBM_GETRANGEMAX, IntPtr.Zero, IntPtr.Zero);
            } 
        }

        private int PageSize
        { 
            get
            { 
                return Misc.ProxySendMessageInt(_hwnd, NativeMethods.TBM_GETPAGESIZE, IntPtr.Zero, IntPtr.Zero); 
            }
        } 

        #endregion

        // ----------------------------------------------------- 
        //
        // Private Fields 
        // 
        // ------------------------------------------------------
 
        #region Private Fields

        private bool _fHorizontal;
 
        // Index value used to represent the container itself.
        private enum SItem 
        { 
            LargeDecrement = 0,
            Thumb = 1, 
            LargeIncrement = 2
        }

        #endregion 

        // ----------------------------------------------------- 
        // 
        //  SliderItem Private Class
        // 
        //-----------------------------------------------------

        #region SliderItem
 
        class SliderItem: ProxySimple, IInvokeProvider
        { 
            // ----------------------------------------------------- 
            //
            // Constructors 
            //
            // ------------------------------------------------------

            #region Constructors 

            internal SliderItem (IntPtr hwnd, ProxyFragment parent, int item, bool fHorizontal) 
            : base (hwnd, parent, item ) 
            {
                _fHorizontal = fHorizontal; 

                // Set the strings to return properly the properties.
                _fIsContent = false;
 
                _sAutomationId = _asAutomationId[item];
 
                if ((WindowsSlider.SItem)item == WindowsSlider.SItem.Thumb) 
                {
                    _cControlType = ControlType.Thumb; 
                }
                else
                {
                    _cControlType = ControlType.Button; 
                }
            } 
 
            #endregion
 
            //-----------------------------------------------------
            //
            //  Patterns Implementation
            // 
            //------------------------------------------------------
 
            #region ProxySimple Interface 

            // Returns a pattern interface if supported. 
            internal override object GetPatternProvider (AutomationPattern iid)
            {
                return _item != (int) WindowsSlider.SItem.Thumb && iid == InvokePattern.Pattern ? this : null;
            } 

            // Gets the bounding rectangle for this element 
            internal override Rect BoundingRectangle 
            {
                get 
                {
                    return GetBoundingRectangle (_hwnd, (WindowsSlider.SItem) _item, _fHorizontal);
                }
            } 

            //Gets the controls help text 
            internal override string HelpText 
            {
                get 
                {
                    IntPtr hwndToolTip = Misc.ProxySendMessage(_hwnd, NativeMethods.TBM_GETTOOLTIPS, IntPtr.Zero, IntPtr.Zero);
                    return Misc.GetItemToolTipText(_hwnd, hwndToolTip, 0);
                } 
            }
 
            //Gets the localized name 
            internal override string LocalizedName
            { 
                get
                {
                    return ST.Get(_asNames[_item]);
                } 
            }
 
            #endregion 

            #region Invoke Pattern 

            // Same as a click on the large or smale increment
            void IInvokeProvider.Invoke ()
            { 
                // Make sure that the control is enabled
                if (!SafeNativeMethods.IsWindowEnabled(_hwnd)) 
                { 
                    throw new ElementNotEnabledException();
                } 

                // Check that button can be clicked (button enabled and not hidden)
                // This state could change anytime so success is not guaranteed
                IntPtr wParam = (IntPtr) (_item == (int) WindowsSlider.SItem.LargeDecrement ? NativeMethods.VK_PRIOR : NativeMethods.VK_NEXT); 

                Misc.ProxySendMessage(_hwnd, NativeMethods.WM_KEYDOWN, wParam, IntPtr.Zero); 
            } 

            #endregion 

            // ------------------------------------------------------
            //
            // Internal Methods 
            //
            // ----------------------------------------------------- 
 
            #region Internal Methods
 
            // Returns the bounding rectangle of the control.
            internal static Rect GetBoundingRectangle (IntPtr hwnd, WindowsSlider.SItem item, bool fHorizontal)
            {
                NativeMethods.Win32Rect rcChannel = new NativeMethods.Win32Rect (); 
                rcChannel.left = rcChannel.right = rcChannel.top = rcChannel.bottom = 1000;
 
                unsafe 
                {
                    XSendMessage.XSend(hwnd, NativeMethods.TBM_GETCHANNELRECT, IntPtr.Zero, new IntPtr(&rcChannel), Marshal.SizeOf(rcChannel.GetType()), XSendMessage.ErrorValue.NoCheck); 
                }
                if (!Misc.MapWindowPoints(hwnd, IntPtr.Zero, ref rcChannel, 2))
                {
                    return Rect.Empty; 
                }
 
                NativeMethods.Win32Rect rcThumb = new NativeMethods.Win32Rect(); 
                rcThumb.left = rcThumb.right = rcThumb.top = rcThumb.bottom = 1000;
 
                unsafe
                {
                    XSendMessage.XSend(hwnd, NativeMethods.TBM_GETTHUMBRECT, IntPtr.Zero, new IntPtr(&rcThumb), Marshal.SizeOf(rcThumb.GetType()), XSendMessage.ErrorValue.NoCheck);
                } 
                if (!Misc.MapWindowPoints(hwnd, IntPtr.Zero, ref rcThumb, 2))
                { 
                    return Rect.Empty; 
                }
 
                if (fHorizontal)
                {
                    // When WS_EX_RTLREADING is set swap the increment and decrement bars.
                    if (Misc.IsLayoutRTL(hwnd)) 
                    {
                        if (item == SItem.LargeDecrement) 
                        { 
                            item = SItem.LargeIncrement;
                        } 
                        else if (item == SItem.LargeIncrement)
                        {
                            item = SItem.LargeDecrement;
                        } 
                    }
 
                    switch (item) 
                    {
                        case WindowsSlider.SItem.LargeDecrement : 
                            return new Rect (rcChannel.left, rcChannel.top, rcThumb.left - rcChannel.left, rcChannel.bottom - rcChannel.top);

                        case WindowsSlider.SItem.Thumb :
                            return new Rect (rcThumb.left, rcThumb.top, rcThumb.right - rcThumb.left, rcThumb.bottom - rcThumb.top); 

                        case WindowsSlider.SItem.LargeIncrement : 
                            return new Rect (rcThumb.right, rcChannel.top, rcChannel.right - rcThumb.right, rcChannel.bottom - rcChannel.top); 
                    }
                } 
                else
                {
                    int dx = rcChannel.bottom - rcChannel.top;
                    int dy = rcChannel.right - rcChannel.left; 

                    switch (item) 
                    { 
                        case WindowsSlider.SItem.LargeDecrement :
                            return new Rect (rcChannel.left, rcChannel.top, dx, rcThumb.top - rcChannel.top); 

                        case WindowsSlider.SItem.Thumb :
                            return new Rect (rcThumb.left, rcThumb.top, rcThumb.right - rcThumb.left, rcThumb.bottom - rcThumb.top);
 
                        case WindowsSlider.SItem.LargeIncrement :
                            return new Rect (rcChannel.left, rcThumb.bottom, dx, dy); 
                    } 
                }
 
                return Rect.Empty;
            }

            #endregion 

            // ------------------------------------------------------ 
            // 
            // Private Fields
            // 
            // -----------------------------------------------------

            #region Private Fields
 
            private bool _fHorizontal;
 
            private STID [] _asNames = { 
                STID.LocalizedNameWindowsSliderItemBackByLargeAmount,
                STID.LocalizedNameWindowsSliderItemThumb, 
                STID.LocalizedNameWindowsSliderItemForwardByLargeAmount
            };

            private static string[] _asAutomationId = new string[] { 
                "LargeDecrement", "Thumb", "LargeIncrement"  // This string is a non-localizable string
            }; 
            #endregion 

        } 
        #endregion

    }
} 


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