WindowsSlider.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / UIAutomation / Win32Providers / MS / Internal / AutomationProxies / WindowsSlider.cs / 1305600 / 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 () 
        {
            int value = Misc.ProxySendMessageInt(_hwnd, NativeMethods.TBM_GETPOS, IntPtr.Zero, IntPtr.Zero); 
 
            // adding support for if WindowsStyle has reversed bit set for the slider.
            if ((this.WindowStyle & NativeMethods.TBS_REVERSED) != 0) 
            {
                int maxValue = Misc.ProxySendMessageInt(_hwnd, NativeMethods.TBM_GETRANGEMAX, IntPtr.Zero, IntPtr.Zero);
                value = maxValue - value;
            } 
            return value;
        } 
 
        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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