public override void OnComputeBox(Renderman renderer, Css.LayoutBox box, ref bool widthUndefined, ref bool heightUndefined)
{
// Get meta:
LineBoxMeta lbm = renderer.TopOfStackSafe;
// If the line is empty, set some height:
if (lbm.FirstOnLine == null)
{
heightUndefined = false;
box.InnerHeight = Style.Computed.FontSizeX;
box.Height = box.InnerHeight;
}
// Implicit line break:
lbm.CompleteLine(LineBreakMode.Normal | LineBreakMode.Last);
}
/// <summary>Lets the renderer know that the given parent element has finished
/// packing all of its kids. This allows alignment to occur next.</summary>
/// <param name="renderable">The element that is done packing.</param>
public void EndLines(LineBoxMeta lineZone, ComputedStyle computed, LayoutBox box)
{
// Pop the box:
BoxStack.Pop();
// Complete the last line:
lineZone.CompleteLine(LineBreakMode.NoBreak | LineBreakMode.Last);
// If inline-block or float, clear:
if (box.DisplayMode == DisplayMode.InlineBlock || box.FloatMode != FloatMode.None)
{
// Must clear:
lineZone.ClearFloat(FloatMode.Both);
lineZone.PenY += lineZone.ClearY_;
lineZone.ClearY_ = 0f;
}
// block, inline-block
if (lineZone is BlockBoxMeta)
{
bool heightChange = false;
if (box.InnerHeight == -1f)
{
heightChange = true;
box.InnerHeight = lineZone.PenY;
// Clip height now:
box.InnerHeight = computed.ClipHeight(box.DisplayMode, box.InnerHeight);
}
box.ContentHeight = lineZone.PenY;
box.ContentWidth = lineZone.LargestLineWidth;
// If it's inline then we set the line width.
if (box.InnerWidth == -1f)
{
box.InnerWidth = lineZone.LargestLineWidth;
// Apply valid width/height:
box.SetDimensions(false, false);
}
else if (heightChange)
{
// Apply valid width/height:
box.SetDimensions(false, false);
}
bool inFlow = (box.PositionMode & PositionMode.InFlow) != 0;
// Update position of the top-of-stack pen:
LineBoxMeta tos = TopOfStackSafe;
if (tos == null)
{
LastBlockBox = null;
}
else
{
if (inFlow)
{
// Advance the pen:
tos.AdvancePen(box);
}
// Restore previous block:
LastBlockBox = tos as BlockBoxMeta;
if (LastBlockBox == null)
{
// Rare - block inside inline.
LastBlockBox = (tos as InlineBoxMeta).HostBlock;
}
}
}
}
public override void Reflow(Renderman renderer)
{
// Get the text renderer (or create it):
Css.TextRenderingProperty text = RequireTextProperty();
if (text.Characters == null || text.AllEmpty)
{
return;
}
LayoutBox box = null;
// Get the baseline offset:
float baseline = text.FontSize * text.FontToDraw.Descender;
// Compute our line boxes based on text.Characters and the available space.
// Safely ignore direction here because either way the selected characters are the same.
// Note that things like first-letter are also considered.
// Get the top of the stack:
LineBoxMeta lbm = renderer.TopOfStack;
float cssLineHeight = lbm.CssLineHeight;
// Is it justify (if so, every word is its own box):
bool breakAllWords = (lbm.HorizontalAlign == HorizontalAlignMode.Justify);
// Offset the baseline:
float lineHeightOffset = (cssLineHeight - text.FontSize) / 2f;
text.LineHeightOffset = lineHeightOffset;
baseline += lineHeightOffset;
float wordWidth = 0f;
float boxWidth = 0f;
bool wrappable = ((lbm.WhiteSpace & WhiteSpaceMode.Wrappable) != 0);
int i = 0;
int latestBreakpoint = -1;
// bidi text direction (0 = Not set yet, UnicodeBidiMode.LeftwardsNormal, UnicodeBidiMode.RightwardsNormal)
int direction = 0;
// Direction before the current block of weak chars.
int beforeWeak = 0;
while (i < text.Characters.Length)
{
// Get the glyph:
InfiniText.Glyph glyph = text.Characters[i];
if (glyph == null)
{
// Skip!
i++;
continue;
}
// The glyph's width is..
float width = (glyph.AdvanceWidth * text.FontSize) + text.LetterSpacing;
if (box == null)
{
// The box always has an inner height of 'font size':
if (renderer.FirstLetter != null)
{
// Clear FL immediately (so it can't go recursive):
SparkInformerNode firstLetter = renderer.FirstLetter;
renderer.FirstLetter = null;
// Update its internal text node:
RenderableTextNode textNode = firstLetter.firstChild as RenderableTextNode;
// Note that we have to do it this way as the node might
// change the *font*.
textNode.characterData_ = ((char)glyph.Charcode) + "";
Css.TextRenderingProperty textData = textNode.RenderData.RequireTextProperty();
textData.Dirty = true;
// Ask it to reflow right now (must ask the node so it correctly takes the style into account):
firstLetter.RenderData.UpdateCss(renderer);
firstLetter.RenderData.Reflow(renderer);
i++;
continue;
}
// Create the box now:
box = new LayoutBox();
box.PositionMode = PositionMode.Static;
box.DisplayMode = DisplayMode.Inline;
box.Baseline = baseline;
box.TextStart = i;
// Adopt current direction:
box.UnicodeBidi = direction;
if (FirstBox == null)
{
FirstBox = box;
LastBox = box;
}
else
{
// add to this element:
LastBox.NextInElement = box;
LastBox = box;
}
// line-height is the inner height here:
box.InnerHeight = cssLineHeight;
boxWidth = 0f;
wordWidth = 0f;
}
// Are we breaking this word?
bool implicitNewline = (glyph.Charcode == (int)'\n');
int breakMode = implicitNewline ? 1 : 0;
// direction:
int dir = glyph.Directionality;
if (dir == InfiniText.BidiBlock.Rightwards)
{
// Rightwards (includes weak ones):
// Was the previous one 'weak'?
if (dir == InfiniText.BidiBlock.WeakLeftToRight)
{
// Update before weak:
beforeWeak = direction;
}
else
{
// Not weak:
beforeWeak = 0;
}
if (direction != UnicodeBidiMode.RightwardsNormal)
{
if (direction == 0)
{
// Not set yet - Set the mode into the box:
box.UnicodeBidi = UnicodeBidiMode.RightwardsNormal;
}
else
{
// Changed from leftwards to rightwards. Break the boxes here.
breakMode = 3;
}
// Update dir:
direction = UnicodeBidiMode.RightwardsNormal;
}
}
else if (dir == InfiniText.BidiBlock.RightToLeft)
{
// Leftwards
if (direction != UnicodeBidiMode.LeftwardsNormal)
{
if (direction == 0)
{
// Not set yet - Set the mode into the box:
box.UnicodeBidi = UnicodeBidiMode.LeftwardsNormal;
}
else
{
// Changed from rightwards to leftwards. Break the boxes here.
breakMode = 3;
}
// Update dir:
direction = UnicodeBidiMode.LeftwardsNormal;
}
// Never weak:
beforeWeak = 0;
}
else if (beforeWeak != 0)
{
// Neutral otherwise
// (adopts whatever the current is, unless the previous one was *weak*,
// in which case, it adopts whatever the direction was before that):
if (direction != beforeWeak)
{
// Change direction!
direction = beforeWeak;
breakMode = 3;
}
}
// Got a space?
bool space = (glyph.Charcode == (int)' ');
if (space)
{
// Advance width:
width += text.WordSpacing;
if (breakAllWords)
{
breakMode = 3;
}
else
{
latestBreakpoint = i;
}
// Lock in the previous text:
boxWidth += wordWidth + width;
wordWidth = 0f;
}
else
{
// Advance word width now:
wordWidth += width;
}
// Word wrapping next:
if (breakMode == 0 && wrappable && i != box.TextStart)
{
// Test if we can break here:
breakMode = lbm.GetLineSpace(wordWidth, boxWidth);
// Return to the previous space if we should.
if (breakMode == 2 && text.OverflowWrapActive)
{
// The word doesn't fit at all (2) and we're supposed to break it.
boxWidth += wordWidth - width;
wordWidth = 0f;
}
else if (breakMode != 0)
{
if (latestBreakpoint == -1)
{
// Isn't a previous space!
if (breakMode == 2)
{
// Instead, we'll try and break a parent.
// This typically happens with inline elements
// which are right on the end of the host line.
lbm.TryBreakParent();
// Don't break the node:
breakMode = 0;
}
else if (breakMode == 3)
{
// Break but no newline - just advance to the following char:
i++;
}
else if (lbm.PenX != lbm.LineStart)
{
// Newline:
lbm.CompleteLine(LineBreakMode.Normal);
// Don't break the node:
breakMode = 0;
}
else
{
// Don't break the node:
breakMode = 0;
}
}
else
{
i = latestBreakpoint + 1;
}
}
}
if (breakMode != 0)
{
// We're breaking!
box.InnerWidth = boxWidth;
box.TextEnd = i;
latestBreakpoint = i;
// If the previous glyph is a space, update EndSpaceSize:
if (space)
{
// Update ending spaces:
box.EndSpaceSize = width;
}
// Ensure dimensions are set:
box.SetDimensions(false, false);
// Add the box to the line:
lbm.AddToLine(box);
// Update dim's:
lbm.AdvancePen(box);
// Clear:
box = null;
boxWidth = 0f;
if (breakMode != 3)
{
// Newline:
if (implicitNewline)
{
// Also the last line:
lbm.CompleteLine(LineBreakMode.Normal | LineBreakMode.Last);
}
else
{
// Normal:
lbm.CompleteLine(LineBreakMode.Normal);
// Process it again.
continue;
}
}
}
// Next character:
i++;
}
if (box != null)
{
// Always apply inner width:
box.InnerWidth = boxWidth + wordWidth;
box.TextEnd = text.Characters.Length;
// Ensure dimensions are set:
box.SetDimensions(false, false);
// Add the box to the line:
lbm.AddToLine(box);
// Update dim's:
lbm.AdvancePen(box);
}
}
