bool NextElementsDontFit(int idx, Area remainingArea, XUnit previousMarginBottom)
{
XUnit elementDistance = previousMarginBottom;
Area area = remainingArea;
for (int index = idx + 1; index < _elements.Count; ++index)
{
// Never combine more than MaxCombineElements elements
if (index - idx > MaxCombineElements)
{
return(false);
}
DocumentObject obj = _elements[index];
Renderer currRenderer = Renderer.Create(_gfx, _documentRenderer, obj, _areaProvider.AreaFieldInfos);
elementDistance = MarginMax(elementDistance, currRenderer.InitialLayoutInfo.MarginTop);
area = area.Lower(elementDistance);
if (area.Height <= 0)
{
return(true);
}
currRenderer.Format(area, null);
FormatInfo currFormatInfo = currRenderer.RenderInfo.FormatInfo;
LayoutInfo currLayoutInfo = currRenderer.RenderInfo.LayoutInfo;
if (currLayoutInfo.VerticalReference != VerticalReference.PreviousElement)
{
return(false);
}
if (!currFormatInfo.StartingIsComplete)
{
return(true);
}
if (currLayoutInfo.KeepTogether && !currFormatInfo.IsComplete)
{
return(true);
}
if (!(currLayoutInfo.KeepTogether && currLayoutInfo.KeepWithNext))
{
return(false);
}
area = area.Lower(currLayoutInfo.ContentArea.Height);
if (area.Height <= 0)
{
return(true);
}
elementDistance = currLayoutInfo.MarginBottom;
}
return(false);
}
/// <summary>
/// Indicates that a break between areas has to be performed before the element with the given idx.
/// </summary>
/// <param name="idx">Index of the document element.</param>
/// <param name="renderer">A formatted renderer for the document element.</param>
/// <param name="remainingArea">The remaining area.</param>
bool IsForcedAreaBreak(int idx, Renderer renderer, Area remainingArea)
{
FormatInfo formatInfo = renderer.RenderInfo.FormatInfo;
LayoutInfo layoutInfo = renderer.RenderInfo.LayoutInfo;
if (formatInfo.IsStarting && !formatInfo.StartingIsComplete)
{
return(true);
}
if (layoutInfo.KeepTogether && !formatInfo.IsComplete)
{
return(true);
}
if (layoutInfo.KeepTogether && layoutInfo.KeepWithNext)
{
Area area = remainingArea.Lower(layoutInfo.ContentArea.Height);
return(NextElementsDontFit(idx, area, layoutInfo.MarginBottom));
}
return(false);
}
bool NeedsEndingOnNextArea(int idx, Renderer renderer, Area remainingArea, bool isFirstOnPage)
{
LayoutInfo layoutInfo = renderer.RenderInfo.LayoutInfo;
if (isFirstOnPage && layoutInfo.KeepTogether)
{
return(false);
}
FormatInfo formatInfo = renderer.RenderInfo.FormatInfo;
if (!formatInfo.EndingIsComplete)
{
return(false);
}
if (layoutInfo.KeepWithNext)
{
remainingArea = remainingArea.Lower(layoutInfo.ContentArea.Height);
return(NextElementsDontFit(idx, remainingArea, layoutInfo.MarginBottom));
}
return(false);
}
/// <summary>
/// Formats the elements on the areas provided by the area provider.
/// </summary>
/// <param name="gfx">The graphics object to render on.</param>
/// <param name="topLevel">if set to <c>true</c> formats the object is on top level.</param>
public void FormatOnAreas(XGraphics gfx, bool topLevel)
{
_gfx = gfx;
XUnit prevBottomMargin = 0;
XUnit yPos = prevBottomMargin;
RenderInfo prevRenderInfo = null;
FormatInfo prevFormatInfo = null;
List <RenderInfo> renderInfos = new List <RenderInfo>();
bool ready = _elements.Count == 0;
bool isFirstOnPage = true;
Area area = _areaProvider.GetNextArea();
XUnit maxHeight = area.Height;
if (ready)
{
_areaProvider.StoreRenderInfos(renderInfos);
return;
}
int idx = 0;
while (!ready && area != null)
{
DocumentObject docObj = _elements[idx];
Renderer renderer = Renderer.Create(gfx, _documentRenderer, docObj, _areaProvider.AreaFieldInfos);
if (renderer != null) // "Slightly hacked" for legends: see below
{
renderer.MaxElementHeight = maxHeight;
}
if (topLevel && _documentRenderer.HasPrepareDocumentProgress)
{
_documentRenderer.OnPrepareDocumentProgress(_documentRenderer.ProgressCompleted + idx + 1,
_documentRenderer.ProgressMaximum);
}
// "Slightly hacked" for legends: they are rendered as part of the chart.
// So they are skipped here.
if (renderer == null)
{
ready = idx == _elements.Count - 1;
if (ready)
{
_areaProvider.StoreRenderInfos(renderInfos);
}
++idx;
continue;
}
///////////////////////////////////////////
if (prevFormatInfo == null)
{
LayoutInfo initialLayoutInfo = renderer.InitialLayoutInfo;
XUnit distance = prevBottomMargin;
if (initialLayoutInfo.VerticalReference == VerticalReference.PreviousElement &&
initialLayoutInfo.Floating != Floating.None)
{
distance = MarginMax(initialLayoutInfo.MarginTop, distance);
}
area = area.Lower(distance);
}
renderer.Format(area, prevFormatInfo);
_areaProvider.PositionHorizontally(renderer.RenderInfo.LayoutInfo);
bool pagebreakBefore = _areaProvider.IsAreaBreakBefore(renderer.RenderInfo.LayoutInfo) && !isFirstOnPage;
pagebreakBefore = pagebreakBefore || !isFirstOnPage && IsForcedAreaBreak(idx, renderer, area);
if (!pagebreakBefore && renderer.RenderInfo.FormatInfo.IsEnding)
{
if (PreviousRendererNeedsRemoveEnding(prevRenderInfo, renderer.RenderInfo, area))
{
prevRenderInfo.RemoveEnding();
renderer = Renderer.Create(gfx, _documentRenderer, docObj, _areaProvider.AreaFieldInfos);
renderer.MaxElementHeight = maxHeight;
renderer.Format(area, prevRenderInfo.FormatInfo);
}
else if (NeedsEndingOnNextArea(idx, renderer, area, isFirstOnPage))
{
renderer.RenderInfo.RemoveEnding();
prevRenderInfo = FinishPage(renderer.RenderInfo, pagebreakBefore, ref renderInfos);
if (prevRenderInfo != null)
{
prevFormatInfo = prevRenderInfo.FormatInfo;
}
else
{
prevFormatInfo = null;
isFirstOnPage = true;
}
prevBottomMargin = 0;
area = _areaProvider.GetNextArea();
maxHeight = area.Height;
}
else
{
renderInfos.Add(renderer.RenderInfo);
isFirstOnPage = false;
_areaProvider.PositionVertically(renderer.RenderInfo.LayoutInfo);
if (renderer.RenderInfo.LayoutInfo.VerticalReference == VerticalReference.PreviousElement &&
renderer.RenderInfo.LayoutInfo.Floating != Floating.None)
{
prevBottomMargin = renderer.RenderInfo.LayoutInfo.MarginBottom;
if (renderer.RenderInfo.LayoutInfo.Floating != Floating.None)
{
area = area.Lower(renderer.RenderInfo.LayoutInfo.ContentArea.Height);
}
}
else
{
prevBottomMargin = 0;
}
prevFormatInfo = null;
prevRenderInfo = null;
++idx;
}
}
else
{
if (renderer.RenderInfo.FormatInfo.IsEmpty && isFirstOnPage)
{
area = area.Unite(new Rectangle(area.X, area.Y, area.Width, double.MaxValue));
renderer = Renderer.Create(gfx, _documentRenderer, docObj, _areaProvider.AreaFieldInfos);
renderer.MaxElementHeight = maxHeight;
renderer.Format(area, prevFormatInfo);
prevFormatInfo = null;
_areaProvider.PositionHorizontally(renderer.RenderInfo.LayoutInfo);
_areaProvider.PositionVertically(renderer.RenderInfo.LayoutInfo);
ready = idx == _elements.Count - 1;
++idx;
}
prevRenderInfo = FinishPage(renderer.RenderInfo, pagebreakBefore, ref renderInfos);
if (prevRenderInfo != null)
{
prevFormatInfo = prevRenderInfo.FormatInfo;
}
else
{
prevFormatInfo = null;
}
isFirstOnPage = true;
prevBottomMargin = 0;
if (!ready)
{
area = _areaProvider.GetNextArea();
maxHeight = area.Height;
}
}
if (idx == _elements.Count && !ready)
{
_areaProvider.StoreRenderInfos(renderInfos);
ready = true;
}
}
}
bool NeedsEndingOnNextArea(int idx, Renderer renderer, Area remainingArea, bool isFirstOnPage)
{
LayoutInfo layoutInfo = renderer.RenderInfo.LayoutInfo;
if (isFirstOnPage && layoutInfo.KeepTogether)
return false;
FormatInfo formatInfo = renderer.RenderInfo.FormatInfo;
if (!formatInfo.EndingIsComplete)
return false;
if (layoutInfo.KeepWithNext)
{
remainingArea = remainingArea.Lower(layoutInfo.ContentArea.Height);
return NextElementsDontFit(idx, remainingArea, layoutInfo.MarginBottom);
}
return false;
}
/// <summary>
/// Indicates that a break between areas has to be performed before the element with the given idx.
/// </summary>
/// <param name="idx">Index of the document element.</param>
/// <param name="renderer">A formatted renderer for the document element.</param>
/// <param name="remainingArea">The remaining area.</param>
bool IsForcedAreaBreak(int idx, Renderer renderer, Area remainingArea)
{
FormatInfo formatInfo = renderer.RenderInfo.FormatInfo;
LayoutInfo layoutInfo = renderer.RenderInfo.LayoutInfo;
if (formatInfo.IsStarting && !formatInfo.StartingIsComplete)
return true;
if (layoutInfo.KeepTogether && !formatInfo.IsComplete)
return true;
if (layoutInfo.KeepTogether && layoutInfo.KeepWithNext)
{
Area area = remainingArea.Lower(layoutInfo.ContentArea.Height);
return NextElementsDontFit(idx, area, layoutInfo.MarginBottom);
}
return false;
}