ScrollPattern.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / AccessibleTech / longhorn / Automation / UIAutomationClient / System / Windows / Automation / ScrollPattern.cs / 1 / ScrollPattern.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// 
// Description: Client-side wrapper for Scroll Pattern 
//
// History: 
//  06/23/2003 : [....] Ported to WCP
//
//---------------------------------------------------------------------------
 
using System;
using System.Windows.Automation.Provider; 
using MS.Internal.Automation; 

namespace System.Windows.Automation 
{
    /// 
    /// Represents UI elements that are expressing a value
    ///  
#if (INTERNAL_COMPILE)
    internal class ScrollPattern: BasePattern 
#else 
    public class ScrollPattern: BasePattern
#endif 
    {
        //-----------------------------------------------------
        //
        //  Constructors 
        //
        //----------------------------------------------------- 
 
        #region Constructors
 
        private ScrollPattern(AutomationElement el, SafePatternHandle hPattern, bool cached)
            : base(el, hPattern)
        {
            _hPattern = hPattern; 
            _cached = cached;
        } 
 
        #endregion Constructors
 

        //------------------------------------------------------
        //
        //  Public Constants / Readonly Fields 
        //
        //----------------------------------------------------- 
 
        #region Public Constants and Readonly Fields
 
        /// Value used by SetSCrollPercent to indicate that no scrolling should take place in the specified direction
        public const double NoScroll = -1.0;

        /// Scroll pattern 
        public static readonly AutomationPattern Pattern = ScrollPatternIdentifiers.Pattern;
 
        /// Property ID: HorizontalScrollPercent - Current horizontal scroll position 
        public static readonly AutomationProperty HorizontalScrollPercentProperty = ScrollPatternIdentifiers.HorizontalScrollPercentProperty;
 
        /// Property ID: HorizontalViewSize - Minimum possible horizontal scroll position
        public static readonly AutomationProperty HorizontalViewSizeProperty = ScrollPatternIdentifiers.HorizontalViewSizeProperty;

        /// Property ID: VerticalScrollPercent - Current vertical scroll position 
        public static readonly AutomationProperty VerticalScrollPercentProperty = ScrollPatternIdentifiers.VerticalScrollPercentProperty;
 
        /// Property ID: VerticalViewSize  
        public static readonly AutomationProperty VerticalViewSizeProperty = ScrollPatternIdentifiers.VerticalViewSizeProperty;
 
        /// Property ID: HorizontallyScrollable
        public static readonly AutomationProperty HorizontallyScrollableProperty = ScrollPatternIdentifiers.HorizontallyScrollableProperty;

        /// Property ID: VerticallyScrollable 
        public static readonly AutomationProperty VerticallyScrollableProperty = ScrollPatternIdentifiers.VerticallyScrollableProperty;
 
        #endregion Public Constants and Readonly Fields 

 
        //------------------------------------------------------
        //
        //  Public Methods
        // 
        //------------------------------------------------------
 
        #region Public Methods 

        ///  Request to set the current horizontal and Vertical scroll position 
        /// by percent (0-100).  Passing in the value of "-1" will indicate that
        /// scrolling in that direction should be ignored.
        /// The ability to call this method and simultaneously scroll horizontally and
        /// vertically provides simple panning support. 
        /// Amount to scroll by horizontally
        /// Amount to scroll by vertically  
        /// 
        /// 
        /// This API does not work inside the secure execution environment. 
        /// 
        /// 
        public void SetScrollPercent( double horizontalPercent, double verticalPercent )
        { 
            UiaCoreApi.ScrollPattern_SetScrollPercent(_hPattern, horizontalPercent, verticalPercent);
        } 
 
        ///  Request to scroll horizontally and vertically by the specified amount.
        /// The ability to call this method and simultaneously scroll horizontally 
        /// and vertically provides simple panning support.  If only horizontal or vertical percent
        /// needs to be changed the constant SetScrollPercentUnchanged can be used for
        /// either parameter and that axis wil be unchanged.
        /// 
        /// amount to scroll by horizontally
        /// amount to scroll by vertically  
        /// 
        /// 
        /// This API does not work inside the secure execution environment. 
        /// 
        /// 
        public void Scroll( ScrollAmount horizontalAmount, ScrollAmount verticalAmount )
        { 
            UiaCoreApi.ScrollPattern_Scroll(_hPattern, horizontalAmount, verticalAmount);
        } 
 
        /// 
        /// Request to scroll horizontally by the specified amount 
        /// 
        /// Amount to scroll by
        ///
        ///  
        /// This API does not work inside the secure execution environment.
        ///  
        ///  
        public void ScrollHorizontal( ScrollAmount amount )
        { 
            UiaCoreApi.ScrollPattern_Scroll(_hPattern, amount, ScrollAmount.NoAmount);
        }

        ///  
        /// Request to scroll vertically by the specified amount
        ///  
        /// Amount to scroll by 
        ///
        ///  
        /// This API does not work inside the secure execution environment.
        /// 
        /// 
        public void ScrollVertical( ScrollAmount amount ) 
        {
            UiaCoreApi.ScrollPattern_Scroll(_hPattern, ScrollAmount.NoAmount, amount); 
        } 

        #endregion Public Methods 


        //-----------------------------------------------------
        // 
        //  Public Properties
        // 
        //------------------------------------------------------ 

        #region Public Properties 
        /// 
        /// This member allows access to previously requested
        /// cached properties for this element. The returned object
        /// has accessors for each property defined for this pattern. 
        /// 
        ///  
        /// Cached property values must have been previously requested 
        /// using a CacheRequest. If you try to access a cached
        /// property that was not previously requested, an InvalidOperation 
        /// Exception will be thrown.
        ///
        /// To get the value of a property at the current point in time,
        /// access the property via the Current accessor instead of 
        /// Cached.
        ///  
        public ScrollPatternInformation Cached 
        {
            get 
            {
                Misc.ValidateCached(_cached);
                return new ScrollPatternInformation(_el, true);
            } 
        }
 
        ///  
        /// This member allows access to current property values
        /// for this element. The returned object has accessors for 
        /// each property defined for this pattern.
        /// 
        /// 
        /// This pattern must be from an AutomationElement with a 
        /// Full reference in order to get current values. If the
        /// AutomationElement was obtained using AutomationElementMode.None, 
        /// then it contains only cached data, and attempting to get 
        /// the current value of any property will throw an InvalidOperationException.
        /// 
        /// To get the cached value of a property that was previously
        /// specified using a CacheRequest, access the property via the
        /// Cached accessor instead of Current.
        ///  
        public ScrollPatternInformation Current
        { 
            get 
            {
                Misc.ValidateCurrent(_hPattern); 
                return new ScrollPatternInformation(_el, false);
            }
        }
 
        #endregion Public Properties
 
 
        //-----------------------------------------------------
        // 
        //  Internal Methods
        //
        //-----------------------------------------------------
 
        #region Internal Methods
 
        static internal object Wrap(AutomationElement el, SafePatternHandle hPattern, bool cached) 
        {
            return new ScrollPattern(el, hPattern, cached); 
        }

        #endregion Internal Methods
 

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

        #region Private Fields
 
        SafePatternHandle _hPattern;
        bool _cached; 
 
        #endregion Private Fields
 

        //-----------------------------------------------------
        //
        //  Nested Classes 
        //
        //------------------------------------------------------ 
 
        #region Nested Classes
 
        /// 
        /// This class provides access to either Cached or Current
        /// properties on a pattern via the pattern's .Cached or
        /// .Current accessors. 
        /// 
        public struct ScrollPatternInformation 
        { 
            //------------------------------------------------------
            // 
            //  Constructors
            //
            //-----------------------------------------------------
 
            #region Constructors
 
            internal ScrollPatternInformation(AutomationElement el, bool useCache) 
            {
                _el = el; 
                _useCache = useCache;
            }

            #endregion Constructors 

 
            //------------------------------------------------------ 
            //
            //  Public Properties 
            //
            //-----------------------------------------------------

            #region Public Properties 

            ///  
            /// Get the current horizontal scroll position 
            /// 
            /// 
            /// 
            /// This API does not work inside the secure execution environment.
            /// 
            ///  
            public double HorizontalScrollPercent
            { 
                get 
                {
                    return (double)_el.GetPatternPropertyValue(HorizontalScrollPercentProperty, _useCache); 
                }
            }

            ///  
            /// Get the current vertical scroll position
            ///  
            /// 
            /// 
            /// This API does not work inside the secure execution environment. 
            /// 
            /// 
            public double VerticalScrollPercent
            { 
                get
                { 
                    return (double)_el.GetPatternPropertyValue(VerticalScrollPercentProperty, _useCache); 
                }
            } 

            /// 
            /// Equal to the horizontal percentage of the entire control that is currently viewable.
            ///  
            ///
            ///  
            /// This API does not work inside the secure execution environment. 
            /// 
            ///  
            public double HorizontalViewSize
            {
                get
                { 
                    return (double)_el.GetPatternPropertyValue(HorizontalViewSizeProperty, _useCache);
                } 
            } 

            ///  
            /// Equal to the horizontal percentage of the entire control that is currently viewable.
            /// 
            ///
            ///  
            /// This API does not work inside the secure execution environment.
            ///  
            ///  
            public double VerticalViewSize
            { 
                get
                {
                    return (double)_el.GetPatternPropertyValue(VerticalViewSizeProperty, _useCache);
                } 
            }
 
            ///  
            /// True if control can scroll horizontally
            ///  
            ///
            /// 
            /// This API does not work inside the secure execution environment.
            ///  
            /// 
            public bool HorizontallyScrollable 
            { 
                get
                { 
                    return (bool)_el.GetPatternPropertyValue(HorizontallyScrollableProperty, _useCache);
                }
            }
 
            /// 
            /// True if control can scroll vertically 
            ///  
            ///
            ///  
            /// This API does not work inside the secure execution environment.
            /// 
            /// 
            public bool VerticallyScrollable 
            {
                get 
                { 
                    return (bool)_el.GetPatternPropertyValue(VerticallyScrollableProperty, _useCache);
                } 
            }

            #endregion Public Properties
 
            //-----------------------------------------------------
            // 
            //  Private Fields 
            //
            //----------------------------------------------------- 

            #region Private Fields

            private AutomationElement _el; // AutomationElement that contains the cache or live reference 
            private bool _useCache; // true to use cache, false to use live reference to get current values
 
            #endregion Private Fields 
        }
        #endregion Nested Classes 
    }
}

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