internal void FullLayout()
{
m_lines = new List <ParaLine>();
m_renderRunIndex = 0;
m_ichRendered = 0;
m_lastRenderRunIndex = m_renderRuns.Count;
if (m_renderRuns.Count != 0)
{
IRenderRun last = m_renderRuns[m_renderRuns.Count - 1];
m_ichLim = last.RenderStart + last.RenderLength;
while (!Finished)
{
BuildALine();
}
}
else
{
m_ichLim = 0;
}
SetParaInfo();
}
/// <summary>
/// Add something to the line. Return true if we should keep trying to add more. (That is, all of the current thing fit,
/// and there is still room left; this routine is not responsible to determine whether there IS anything else to add.)
/// If there is not yet anything in the line, this routine MUST add something; otherwise, it is allowed to fail,
/// returning false without changing anything.
/// </summary>
private bool AddSomethingToLine()
{
m_currentRenderRun = m_renderRuns[m_renderRunIndex];
Box boxToAdd = m_currentRenderRun.Box;
if (boxToAdd != null)
{
// The current run works out to a single box; add it if it fits. Add it anyway if the line
// is currently empty.
boxToAdd.Layout(m_layoutInfo);
if (m_currentLine.FirstBox != null && boxToAdd.Width > m_spaceLeftOnCurrentLine)
return false;
m_spaceLeftOnCurrentLine -= boxToAdd.Width;
AddBoxToLine(boxToAdd, LgEndSegmentType.kestOkayBreak); // always OK to break after non-string.
boxToAdd.Container = m_para;
m_ichRendered = m_currentRenderRun.RenderLim;
m_renderRunIndex++;
}
else
{
// current run is not a simple box. Make a text box out of part or all of it, or possibly also subsequent
// runs that are not boxes and use the same renderer.
IRenderEngine renderer = m_layoutInfo.GetRenderer(m_currentRenderRun.Ws);
// If our text source doesn't yet know about the writing system factory, make sure it does.
if (m_para.Source.GetWsFactory() == null)
m_para.Source.SetWsFactory(renderer.WritingSystemFactory);
int ichRunLim = GetLimitOfRunWithSameRenderer(renderer, m_renderRunIndex);
ILgSegment seg;
int dichLim, dxWidth;
LgEndSegmentType est;
bool mustGetSomeSeg = m_currentLine.FirstBox == null;
var twsh = GetNextTwsh();
renderer.FindBreakPoint(m_layoutInfo.VwGraphics, m_para.Source, null, m_ichRendered,
ichRunLim, ichRunLim, false, mustGetSomeSeg, m_spaceLeftOnCurrentLine, (mustGetSomeSeg ? LgLineBreak.klbClipBreak : LgLineBreak.klbWordBreak),
m_currentLine.FirstBox == null ? LgLineBreak.klbClipBreak : LgLineBreak.klbWordBreak, twsh,
false, out seg, out dichLim, out dxWidth, out est, null);
if (est == LgEndSegmentType.kestNothingFit && twsh != LgTrailingWsHandling.ktwshAll)
{
// Nothing of the one we were trying for, try for the other.
twsh = GetNextTwsh();
renderer.FindBreakPoint(m_layoutInfo.VwGraphics, m_para.Source, null, m_ichRendered,
ichRunLim, ichRunLim, false, mustGetSomeSeg, m_spaceLeftOnCurrentLine, (mustGetSomeSeg ? LgLineBreak.klbClipBreak : LgLineBreak.klbWordBreak),
m_currentLine.FirstBox == null ? LgLineBreak.klbClipBreak : LgLineBreak.klbWordBreak, twsh,
false, out seg, out dichLim, out dxWidth, out est, null);
}
switch (est)
{
case LgEndSegmentType.kestNoMore:
case LgEndSegmentType.kestOkayBreak:
case LgEndSegmentType.kestMoreLines:
case LgEndSegmentType.kestWsBreak:
case LgEndSegmentType.kestMoreWhtsp:
boxToAdd = new StringBox(m_para.Style, seg, m_ichRendered);
boxToAdd.Layout(m_layoutInfo);
m_spaceLeftOnCurrentLine -= boxToAdd.Width;
m_ichRendered += dichLim;
boxToAdd.Container = m_para;
// If we get NoMore, we should also check, because it might really be a ws break at the end
// of the run.
if (est == LgEndSegmentType.kestNoMore && ichRunLim < m_para.Source.Length && ichRunLim > 0
&& WsInSource(ichRunLim - 1, m_para.Source) != WsInSource(ichRunLim, m_para.Source))
{
// The renderer failed to detect it because not told to look further in the source,
// but there is in fact a writing system break.
// However, if the next character is a box, we want to treat it as a definitely good break.
if (m_para.Source.IsThereABoxAt(ichRunLim))
est = LgEndSegmentType.kestOkayBreak;
else
est = LgEndSegmentType.kestWsBreak;
}
AddBoxToLine(boxToAdd, est);
m_renderRunIndex = AdvanceRenderRunIndexToIch(m_ichRendered, m_renderRunIndex);
// We want to return true if more could be put on this line.
// Of the cases that take this branch, NoMore means no more input at all, so we can't add any more;
// MoreLines means this line is full. So for both of those we return false. OkayBreak allows us to try
// to put more segments on this line, as does ws break, and moreWhtsp.
return est == LgEndSegmentType.kestOkayBreak || est == LgEndSegmentType.kestWsBreak || est == LgEndSegmentType.kestMoreWhtsp;
case LgEndSegmentType.kestNothingFit:
Debug.Assert(m_currentLine.FirstBox != null, "Making segment must not return kestNothingFit if line contains nothing");
return false;
//case LgEndSegmentType.kestHardBreak:
// if()
// return true;
default:
Debug.Assert(false);
break;
}
}
return true;
}
void VerifyRenderRun(IRenderRun run, int start, int length, string label)
{
Assert.AreEqual(start, run.RenderStart, label + " - start");
Assert.AreEqual(length, run.RenderLength, label + " - length");
}
void VerifyRenderRun(IRenderRun run, int start, int length, string label)
{
Assert.AreEqual(start, run.RenderStart, label + " - start");
Assert.AreEqual(length, run.RenderLength, label + " - length");
}
/// <summary>
/// Redo layout. Should produce the same segments as FullLayout, but assume that segments for text up to
/// details.StartChange may be reused (if not affected by changing line breaks), and segments after
/// details.StartChange+details.DeleteCount may be re-used if a line break works out (and after adjusting
/// their begin offset).
/// </summary>
/// <param name="details"></param>
internal void Relayout(SourceChangeDetails details, LayoutCallbacks lcb)
{
m_reuseableLines = m_para.Lines;
m_lines = new List <ParaLine>();
m_renderRunIndex = 0;
m_ichRendered = 0;
IRenderRun last = m_renderRuns[m_renderRuns.Count - 1];
m_ichLim = last.RenderStart + last.RenderLength;
m_lastRenderRunIndex = m_renderRuns.Count;
Rectangle invalidateRect = m_para.InvalidateRect;
int delta = details.InsertCount - details.DeleteCount;
int oldHeight = m_para.Height;
int oldWidth = m_para.Width;
// Make use of details.StartChange to reuse some lines at start.
if (m_reuseableLines.Count > 0)
{
// As long as we have two complete lines before the change, we can certainly reuse the first of them.
while (m_reuseableLines.Count > 2 && details.StartChange > m_reuseableLines[2].IchMin)
{
m_lines.Add(m_reuseableLines[0]);
m_reuseableLines.RemoveAt(0);
}
// If we still have one complete line before the change, we can reuse it provided there is white
// space after the end of the line and before the change.
if (m_reuseableLines.Count > 1)
{
int startNextLine = m_reuseableLines[1].IchMin;
if (details.StartChange > startNextLine)
{
bool fGotWhite = false;
string line1Text = m_reuseableLines[1].CheckedText;
int lim = details.StartChange - startNextLine;
var cpe = LgIcuCharPropEngineClass.Create();
for (int ich = 0; ich < lim; ich++)
{
// Enhance JohnT: possibly we need to consider surrogates here?
// Worst case is we don't reuse a line we could have, since a surrogate won't
// be considered white.
if (cpe.get_IsSeparator(Convert.ToInt32(line1Text[ich])))
{
fGotWhite = true;
break;
}
}
if (fGotWhite)
{
m_lines.Add(m_reuseableLines[0]);
m_reuseableLines.RemoveAt(0);
}
}
}
m_ichRendered = m_reuseableLines[0].IchMin;
int topOfFirstDiscardedLine = m_reuseableLines[0].Top;
// We don't need to invalidate the lines we're keeping.
invalidateRect = new Rectangle(invalidateRect.Left, invalidateRect.Top + topOfFirstDiscardedLine,
invalidateRect.Width, invalidateRect.Height - topOfFirstDiscardedLine);
}
// Figure out which run we need to continue from, to correspond to the start of the first line
// we need to rebuild.
while (m_renderRunIndex < m_renderRuns.Count && m_renderRuns[m_renderRunIndex].RenderLim <= m_ichRendered)
{
m_renderRunIndex++;
}
while (!Finished)
{
// Todo: I think we need to adjust available width if this is the first line.
BuildALine();
// Drop any initial reusable lines we now determine to be unuseable after all.
// If we've used characters beyond the start of this potentially reusable line, we can't reuse it.
// Also, we don't reuse empty lines. Typically an empty line is left over from a previously empty
// paragraph, and we no longer need the empty segment, even though it doesn't have any of the same
// characters (since it has none) as the segment that has replaced it.
while (m_reuseableLines.Count > 0 && (m_ichRendered > m_reuseableLines[0].IchMin + delta || m_reuseableLines[0].Length == 0))
{
m_reuseableLines.RemoveAt(0);
}
if (m_reuseableLines.Count > 0)
{
// See if we can resync.
var nextLine = m_reuseableLines[0];
if (m_ichRendered == nextLine.IchMin + delta)
{
// reuse it.
int top = m_gapTop;
if (m_lines.Count > 0)
{
ParaLine previous = m_lines.Last();
previous.LastBox.Next = nextLine.FirstBox;
top = TopOfNextLine(previous, nextLine.Ascent);
}
m_lines.AddRange(m_reuseableLines);
if (top != nextLine.Top)
{
ParaLine previous = null;
foreach (var line in m_reuseableLines)
{
if (previous != null) // first time top has already been computed
{
top = TopOfNextLine(previous, line.Ascent);
}
line.Top = top; // BEFORE ArrangeBoxes, since it gets copied to the individual boxes
m_currentLine.ArrangeBoxes(m_para.Style.ParaAlignment, m_gapLeft, m_gapRight, 0, m_layoutInfo.MaxWidth, TopDepth);
previous = line;
}
}
else
{
// reusable lines have not moved, we don't need to invalidate them.
invalidateRect.Height -= (m_reuseableLines.Last().Bottom - top);
}
for (Box box = nextLine.FirstBox; box != null; box = box.Next)
{
if (box is StringBox)
{
(box as StringBox).IchMin += delta;
}
}
break;
}
}
}
SetParaInfo();
// if the paragraph got larger, we need to invalidate the extra area.
// (But, don't reduce it if it got smaller; we want to invalidate all the old stuff as well as all the new.)
if (m_para.Height > oldHeight)
{
invalidateRect.Height += m_para.Height - oldHeight;
}
if (m_para.Width > oldWidth)
{
invalidateRect.Width += m_para.Width - oldWidth;
}
lcb.InvalidateInRoot(invalidateRect);
}
/// <summary>
/// Add something to the line. Return true if we should keep trying to add more. (That is, all of the current thing fit,
/// and there is still room left; this routine is not responsible to determine whether there IS anything else to add.)
/// If there is not yet anything in the line, this routine MUST add something; otherwise, it is allowed to fail,
/// returning false without changing anything.
/// </summary>
private bool AddSomethingToLine()
{
m_currentRenderRun = m_renderRuns[m_renderRunIndex];
Box boxToAdd = m_currentRenderRun.Box;
if (boxToAdd != null)
{
// The current run works out to a single box; add it if it fits. Add it anyway if the line
// is currently empty.
boxToAdd.Layout(m_layoutInfo);
if (m_currentLine.FirstBox != null && boxToAdd.Width > m_spaceLeftOnCurrentLine)
{
return(false);
}
m_spaceLeftOnCurrentLine -= boxToAdd.Width;
AddBoxToLine(boxToAdd, LgEndSegmentType.kestOkayBreak); // always OK to break after non-string.
boxToAdd.Container = m_para;
m_ichRendered = m_currentRenderRun.RenderLim;
m_renderRunIndex++;
}
else
{
// current run is not a simple box. Make a text box out of part or all of it, or possibly also subsequent
// runs that are not boxes and use the same renderer.
IRenderEngine renderer = m_layoutInfo.GetRenderer(m_currentRenderRun.Ws);
// If our text source doesn't yet know about the writing system factory, make sure it does.
if (m_para.Source.GetWsFactory() == null)
{
m_para.Source.SetWsFactory(renderer.WritingSystemFactory);
}
int ichRunLim = GetLimitOfRunWithSameRenderer(renderer, m_renderRunIndex);
ILgSegment seg;
int dichLim, dxWidth;
LgEndSegmentType est;
bool mustGetSomeSeg = m_currentLine.FirstBox == null;
var twsh = GetNextTwsh();
renderer.FindBreakPoint(m_layoutInfo.VwGraphics, m_para.Source, null, m_ichRendered,
ichRunLim, ichRunLim, false, mustGetSomeSeg, m_spaceLeftOnCurrentLine, (mustGetSomeSeg ? LgLineBreak.klbClipBreak : LgLineBreak.klbWordBreak),
m_currentLine.FirstBox == null ? LgLineBreak.klbClipBreak : LgLineBreak.klbWordBreak, twsh,
false, out seg, out dichLim, out dxWidth, out est, null);
if (est == LgEndSegmentType.kestNothingFit && twsh != LgTrailingWsHandling.ktwshAll)
{
// Nothing of the one we were trying for, try for the other.
twsh = GetNextTwsh();
renderer.FindBreakPoint(m_layoutInfo.VwGraphics, m_para.Source, null, m_ichRendered,
ichRunLim, ichRunLim, false, mustGetSomeSeg, m_spaceLeftOnCurrentLine, (mustGetSomeSeg ? LgLineBreak.klbClipBreak : LgLineBreak.klbWordBreak),
m_currentLine.FirstBox == null ? LgLineBreak.klbClipBreak : LgLineBreak.klbWordBreak, twsh,
false, out seg, out dichLim, out dxWidth, out est, null);
}
switch (est)
{
case LgEndSegmentType.kestNoMore:
case LgEndSegmentType.kestOkayBreak:
case LgEndSegmentType.kestMoreLines:
case LgEndSegmentType.kestWsBreak:
case LgEndSegmentType.kestMoreWhtsp:
boxToAdd = new StringBox(m_para.Style, seg, m_ichRendered);
boxToAdd.Layout(m_layoutInfo);
m_spaceLeftOnCurrentLine -= boxToAdd.Width;
m_ichRendered += dichLim;
boxToAdd.Container = m_para;
// If we get NoMore, we should also check, because it might really be a ws break at the end
// of the run.
if (est == LgEndSegmentType.kestNoMore && ichRunLim < m_para.Source.Length && ichRunLim > 0 &&
WsInSource(ichRunLim - 1, m_para.Source) != WsInSource(ichRunLim, m_para.Source))
{
// The renderer failed to detect it because not told to look further in the source,
// but there is in fact a writing system break.
// However, if the next character is a box, we want to treat it as a definitely good break.
if (m_para.Source.IsThereABoxAt(ichRunLim))
{
est = LgEndSegmentType.kestOkayBreak;
}
else
{
est = LgEndSegmentType.kestWsBreak;
}
}
AddBoxToLine(boxToAdd, est);
m_renderRunIndex = AdvanceRenderRunIndexToIch(m_ichRendered, m_renderRunIndex);
// We want to return true if more could be put on this line.
// Of the cases that take this branch, NoMore means no more input at all, so we can't add any more;
// MoreLines means this line is full. So for both of those we return false. OkayBreak allows us to try
// to put more segments on this line, as does ws break, and moreWhtsp.
return(est == LgEndSegmentType.kestOkayBreak || est == LgEndSegmentType.kestWsBreak || est == LgEndSegmentType.kestMoreWhtsp);
case LgEndSegmentType.kestNothingFit:
Debug.Assert(m_currentLine.FirstBox != null, "Making segment must not return kestNothingFit if line contains nothing");
return(false);
//case LgEndSegmentType.kestHardBreak:
// if()
// return true;
default:
Debug.Assert(false);
break;
}
}
return(true);
}
