Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / MS / Internal / PtsHost / BackgroundFormatInfo.cs / 1305600 / BackgroundFormatInfo.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // // Description: Background format information // // History: // 10/28/04 : ghermann - Created // //--------------------------------------------------------------------------- using System; using MS.Internal.Documents; // FlowDocumentFormatter using System.Windows.Threading; // DispatcherTimer namespace MS.Internal.PtsHost { internal sealed class BackgroundFormatInfo { //------------------------------------------------------------------- // // Constructors // //------------------------------------------------------------------- #region Constructors ////// Structural Cache contructor /// internal BackgroundFormatInfo(StructuralCache structuralCache) { _structuralCache = structuralCache; } #endregion Constructors //-------------------------------------------------------------------- // // Internal Methods // //------------------------------------------------------------------- #region Internal Methods ////// Updates background layout information from a structuralCache /// internal void UpdateBackgroundFormatInfo() { _cpInterrupted = -1; _lastCPUninterruptible = 0; _doesFinalDTRCoverRestOfText = false; _cchAllText = _structuralCache.TextContainer.SymbolCount; if(_structuralCache.DtrList != null) { int positionsAdded = 0; // Sum for all dtrs but the last for(int dtrIndex = 0; dtrIndex < _structuralCache.DtrList.Length - 1; dtrIndex++) { positionsAdded += _structuralCache.DtrList[dtrIndex].PositionsAdded - _structuralCache.DtrList[dtrIndex].PositionsRemoved; } DirtyTextRange dtrLast = _structuralCache.DtrList[_structuralCache.DtrList.Length - 1]; if((dtrLast.StartIndex + positionsAdded + dtrLast.PositionsAdded) >= _cchAllText) { _doesFinalDTRCoverRestOfText = true; _lastCPUninterruptible = dtrLast.StartIndex + positionsAdded; } } else { _doesFinalDTRCoverRestOfText = true; } // And set a good stop time for formatting _backgroundFormatStopTime = DateTime.UtcNow.AddMilliseconds(_stopTimeDelta); } ////// This method is called after user input. /// Temporarily disable background layout to cut down on ui latency. /// internal void ThrottleBackgroundFormatting() { if (_throttleBackgroundTimer == null) { // Start up a timer. Until the timer fires, we'll disable // all background layout. This leaves the control responsive // to user input. _throttleBackgroundTimer = new DispatcherTimer(DispatcherPriority.Background); _throttleBackgroundTimer.Interval = new TimeSpan(0, 0, (int)_throttleBackgroundSeconds); _throttleBackgroundTimer.Tick += new EventHandler(OnThrottleBackgroundTimeout); } else { // Reset the timer. _throttleBackgroundTimer.Stop(); } _throttleBackgroundTimer.Start(); } ////// Run one iteration of background formatting. Currently that simply requires /// that we invalidate the content. /// internal void BackgroundFormat(IFlowDocumentFormatter formatter, bool ignoreThrottle) { if (_throttleBackgroundTimer == null) { formatter.OnContentInvalidated(true); } else if (ignoreThrottle) { OnThrottleBackgroundTimeout(null, EventArgs.Empty); } else { // If we had recent user input, wait until the timeout passes // to invalidate. _pendingBackgroundFormatter = formatter; } } #endregion Internal Methods //-------------------------------------------------------------------- // // Internal Properties // //-------------------------------------------------------------------- #region Internal Properties ////// Last CP Uninterruptible /// internal int LastCPUninterruptible { get { return _lastCPUninterruptible; } } ////// Stop time for background formatting timeslice /// internal DateTime BackgroundFormatStopTime { get { return _backgroundFormatStopTime; } } ////// Cch of all text in container /// internal int CchAllText { get { return _cchAllText; } } ////// Whether background layout is globally enabled /// static internal bool IsBackgroundFormatEnabled { get { return _isBackgroundFormatEnabled; } } ////// Does the final dtr extend through the sum of the text /// internal bool DoesFinalDTRCoverRestOfText { get { return _doesFinalDTRCoverRestOfText; } } ////// Current last cp formatted /// internal int CPInterrupted { get { return _cpInterrupted; } set { _cpInterrupted = value; } } ////// Height of the viewport /// internal double ViewportHeight { get { return _viewportHeight; } set { _viewportHeight = value; } } #endregion Internal Properties //------------------------------------------------------------------- // // Private Methods // //-------------------------------------------------------------------- #region Private Methods // Callback for the background layout throttle timer. // Resumes backgound layout. private void OnThrottleBackgroundTimeout(object sender, EventArgs e) { _throttleBackgroundTimer.Stop(); _throttleBackgroundTimer = null; if (_pendingBackgroundFormatter != null) { BackgroundFormat(_pendingBackgroundFormatter, true /* ignoreThrottle */); _pendingBackgroundFormatter = null; } } #endregion Private Methods //------------------------------------------------------------------- // // Private Fields // //------------------------------------------------------------------- #region Private Fields //------------------------------------------------------------------- // Height of the viewport. //-------------------------------------------------------------------- private double _viewportHeight; //------------------------------------------------------------------- // Does the final DTR cover the entirety of the range? //-------------------------------------------------------------------- private bool _doesFinalDTRCoverRestOfText; //-------------------------------------------------------------------- // What is the last uninterruptible cp ? //------------------------------------------------------------------- private int _lastCPUninterruptible; //-------------------------------------------------------------------- // Stop time for background layout // Used for background layout //------------------------------------------------------------------- private DateTime _backgroundFormatStopTime; //------------------------------------------------------------------- // Cch of all text in container //------------------------------------------------------------------- private int _cchAllText; //-------------------------------------------------------------------- // Cp Interrupted // Used for background layout //------------------------------------------------------------------- private int _cpInterrupted; //-------------------------------------------------------------------- // Global enabling flag for whether background format is enabled. //-------------------------------------------------------------------- private static bool _isBackgroundFormatEnabled = true; //------------------------------------------------------------------- // Structural cache //-------------------------------------------------------------------- private StructuralCache _structuralCache; //------------------------------------------------------------------- // Time after a user input until which we use a minimal time slice // to remain responsive to future input. //------------------------------------------------------------------- private DateTime _throttleTimeout = DateTime.UtcNow; //------------------------------------------------------------------- // Timer used to disable background layout during user interaction. //-------------------------------------------------------------------- private DispatcherTimer _throttleBackgroundTimer; //------------------------------------------------------------------- // Holds the formatter to invalidate when _throttleBackgroundTimer // fires. //-------------------------------------------------------------------- IFlowDocumentFormatter _pendingBackgroundFormatter; //-------------------------------------------------------------------- // Number of seconds to disable background layout after receiving // user input. //------------------------------------------------------------------- private const uint _throttleBackgroundSeconds = 2; //-------------------------------------------------------------------- // Max time slice (ms) for one background format iteration. //------------------------------------------------------------------- private const uint _stopTimeDelta = 200; #endregion Private Fields } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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