Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / MS / Internal / PtsHost / MarginCollapsingState.cs / 1305600 / MarginCollapsingState.cs
//---------------------------------------------------------------------------- // // Copyright (C) Microsoft Corporation. All rights reserved. // // File: MarginCollapsingState.cs // // Description: Provides paragraph level margin collapsing support. // // History: // 05/05/2003 : [....] - moving from Avalon branch. // //--------------------------------------------------------------------------- using System; namespace MS.Internal.PtsHost { // --------------------------------------------------------------------- // MarginCollapsingState class provides paragraph level margin collapsing // support. // // Adjoining vertical margins of two paragraphs collapse. The resulting // margin width is the maximum of the adjoining margin widths. In the case // of negative margins, the absolute maximum of the negative adjoining // margins is deducted from the maximum of the positive adjoining margins. // If there are no positive margins, the absolute maximum of the negative // adjoining margins is deducted from zero. // --------------------------------------------------------------------- internal sealed class MarginCollapsingState : UnmanagedHandle { // ------------------------------------------------------------------ // Create new margin collapsing state and collapse margins if necessary. // If no collapsing happens, retrieve margin from old collapsing state. // This margin value should be used to advance pen. // ----------------------------------------------------------------- internal static void CollapseTopMargin( PtsContext ptsContext, // Current PTS Context. MbpInfo mbp, // MBP information for element entering the scope MarginCollapsingState mcsCurrent, // current margin collapsing state (adjacent to the new one). out MarginCollapsingState mcsNew, // margin collapsing state for element entering the scope out int margin) // collapsed margin value { margin = 0; mcsNew = null; // Create new margin collapsing info mcsNew = new MarginCollapsingState(ptsContext, mbp.MarginTop); // collapse margins, if current margin collapsing exists if (mcsCurrent != null) { mcsNew.Collapse(mcsCurrent); } // If border or paddind is specified: // (1) get collapsed margin value // (2) set new mcs to null, because we don't have one anymore if (mbp.BPTop != 0) { margin = mcsNew.Margin; mcsNew.Dispose(); mcsNew = null; } else if (mcsCurrent == null && DoubleUtil.IsZero(mbp.Margin.Top)) { // No need to create new margin collapsing info mcsNew.Dispose(); mcsNew = null; } } // ------------------------------------------------------------------ // Update current margin collapsing state and collapse margins if // necessary. If no collapsing happens, retrieve margin from previous // collapsing state. This margin value should be used to advance pen. // ------------------------------------------------------------------ internal static void CollapseBottomMargin( PtsContext ptsContext, // Current PTS Context. MbpInfo mbp, // MBP information for element leaving the scope MarginCollapsingState mcsCurrent, // current margin collapsing state (adjacent to the new one). out MarginCollapsingState mcsNew, // margin collapsing state for element leaving the scope out int margin) // collapsed margin value { margin = 0; mcsNew = null; // Create new margin collapsing state, if necessary if (!DoubleUtil.IsZero(mbp.Margin.Bottom)) { mcsNew = new MarginCollapsingState(ptsContext, mbp.MarginBottom); } // If the current margin collapsing state does not exist, we are done. // Otherwise, get current border and padding and decide if to collapse margin. if (mcsCurrent != null) { if (mbp.BPBottom != 0) { // No collapsing happens, get margin value margin = mcsCurrent.Margin; } else { // Collapse margins if (mcsNew == null) { mcsNew = new MarginCollapsingState(ptsContext, 0); } mcsNew.Collapse(mcsCurrent); } } } // ----------------------------------------------------------------- // Constructor. // // ptsContext - Current PTS context. // margin - margin value // ------------------------------------------------------------------ internal MarginCollapsingState(PtsContext ptsContext, int margin) : base(ptsContext) { _maxPositive = (margin >= 0) ? margin : 0; _minNegative = (margin < 0) ? margin : 0; } // ----------------------------------------------------------------- // Constructor. Make identical copy of the margin collapsing state. // // mcs - margin collapsing state to copy // ----------------------------------------------------------------- private MarginCollapsingState(MarginCollapsingState mcs) : base(mcs.PtsContext) { _maxPositive = mcs._maxPositive; _minNegative = mcs._minNegative; } // ----------------------------------------------------------------- // Make identical copy of the margin collapsing state. // // Returns: identical copy of margin collapsing state. // ------------------------------------------------------------------ internal MarginCollapsingState Clone() { return new MarginCollapsingState(this); } // ----------------------------------------------------------------- // Compare margin collapsing state with another one. // // mcs - another margin collapsing state // // Returns: 'true' if both are the same. // ------------------------------------------------------------------ internal bool IsEqual(MarginCollapsingState mcs) { return (_maxPositive == mcs._maxPositive && _minNegative == mcs._minNegative); } // ------------------------------------------------------------------ // The resulting margin width is the maximum of the adjoining margin // widths. In the case of negative margins, the absolute maximum of // the negative adjoining margins is deducted from the maximum of // the positive adjoining margins. If there are no positive margins, // the absolute maximum of the negative adjoining margins is deducted // from zero. // // mcs - margin collapsing state to collapse with // ----------------------------------------------------------------- internal void Collapse(MarginCollapsingState mcs) { _maxPositive = Math.Max(_maxPositive, mcs._maxPositive); _minNegative = Math.Min(_minNegative, mcs._minNegative); } // ------------------------------------------------------------------ // The resulting margin width is the maximum of the adjoining margin // widths. In the case of negative margins, the absolute maximum of // the negative adjoining margins is deducted from the maximum of // the positive adjoining margins. If there are no positive margins, // the absolute maximum of the negative adjoining margins is deducted // from zero. // // margin - margin value to collapse with // ----------------------------------------------------------------- //internal void Collapse(int margin) //{ // _maxPositive = Math.Max(_maxPositive, margin); // _minNegative = Math.Min(_minNegative, margin); //} // ----------------------------------------------------------------- // Actual margin value. // ----------------------------------------------------------------- internal int Margin { get { return _maxPositive + _minNegative; } } // ------------------------------------------------------------------ // Maximum positive and minimum negative value for margin. // ----------------------------------------------------------------- private int _maxPositive; private int _minNegative; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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