/// <summary>
/// Applies right to left direction to words
/// </summary>
/// <param name="blockBox"></param>
/// <param name="lineBox"></param>
private static void ApplyRightToLeft(CssBox blockBox, CssLineBox lineBox)
{
if (blockBox.Direction == CssConstants.Rtl)
{
ApplyRightToLeftOnLine(lineBox);
}
else
{
foreach (var box in lineBox.RelatedBoxes)
{
if (box.Direction == CssConstants.Rtl)
{
ApplyRightToLeftOnSingleBox(lineBox, box);
}
}
}
}
/// <summary>
/// Simplest alignment, just arrange words.
/// </summary>
/// <param name="g"></param>
/// <param name="line"></param>
private static void ApplyLeftAlignment(RGraphics g, CssLineBox line)
{
//No alignment needed.
//foreach (LineBoxRectangle r in line.Rectangles)
//{
// double curx = r.Left + (r.Index == 0 ? r.OwnerBox.ActualPaddingLeft + r.OwnerBox.ActualBorderLeftWidth / 2 : 0);
// if (r.SpaceBefore) curx += r.OwnerBox.ActualWordSpacing;
// foreach (BoxWord word in r.Words)
// {
// word.Left = curx;
// word.Top = r.Top;// +r.OwnerBox.ActualPaddingTop + r.OwnerBox.ActualBorderTopWidth / 2;
// curx = word.Right + r.OwnerBox.ActualWordSpacing;
// }
//}
}
/// <summary>
/// Applies vertical and horizontal alignment to words in lineboxes
/// </summary>
/// <param name="g"></param>
/// <param name="lineBox"></param>
private static void ApplyAlignment(RGraphics g, CssLineBox lineBox)
{
switch (lineBox.OwnerBox.TextAlign)
{
case CssConstants.Right:
ApplyRightAlignment(g, lineBox);
break;
case CssConstants.Center:
ApplyCenterAlignment(g, lineBox);
break;
case CssConstants.Justify:
ApplyJustifyAlignment(g, lineBox);
break;
default:
ApplyLeftAlignment(g, lineBox);
break;
}
ApplyVerticalAlignment(g, lineBox);
}
/// <summary>
/// Applies centered alignment to the text on the linebox
/// </summary>
/// <param name="g"></param>
/// <param name="lineBox"></param>
private static void ApplyJustifyAlignment(RGraphics g, CssLineBox lineBox)
{
if (lineBox.Equals(lineBox.OwnerBox.LineBoxes[lineBox.OwnerBox.LineBoxes.Count - 1]))
{
return;
}
double indent = lineBox.Equals(lineBox.OwnerBox.LineBoxes[0]) ? lineBox.OwnerBox.ActualTextIndent : 0f;
double textSum = 0f;
double words = 0f;
double availWidth = lineBox.OwnerBox.ClientRectangle.Width - indent;
// Gather text sum
foreach (CssRect w in lineBox.Words)
{
textSum += w.Width;
words += 1f;
}
if (words <= 0f)
{
return; //Avoid Zero division
}
double spacing = (availWidth - textSum) / words; //Spacing that will be used
double curx = lineBox.OwnerBox.ClientLeft + indent;
foreach (CssRect word in lineBox.Words)
{
word.Left = curx;
curx = word.Right + spacing;
if (word == lineBox.Words[lineBox.Words.Count - 1])
{
word.Left = lineBox.OwnerBox.ClientRight - word.Width;
}
}
}
/// <summary>
/// Recursively flows the content of the box using the inline model
/// </summary>
/// <param name="g">Device Info</param>
/// <param name="blockbox">Blockbox that contains the text flow</param>
/// <param name="box">Current box to flow its content</param>
/// <param name="limitRight">Maximum reached right</param>
/// <param name="linespacing">Space to use between rows of text</param>
/// <param name="startx">x starting coordinate for when breaking lines of text</param>
/// <param name="line">Current linebox being used</param>
/// <param name="curx">Current x coordinate that will be the left of the next word</param>
/// <param name="cury">Current y coordinate that will be the top of the next word</param>
/// <param name="maxRight">Maximum right reached so far</param>
/// <param name="maxbottom">Maximum bottom reached so far</param>
private static void FlowBox(RGraphics g, CssBox blockbox, CssBox box, double limitRight, double linespacing, double startx, ref CssLineBox line, ref double curx, ref double cury, ref double maxRight, ref double maxbottom)
{
var startX = curx;
var startY = cury;
box.FirstHostingLineBox = line;
var localCurx = curx;
var localMaxRight = maxRight;
var localmaxbottom = maxbottom;
foreach (CssBox b in box.Boxes)
{
double leftspacing = b.Position != CssConstants.Absolute ? b.ActualMarginLeft + b.ActualBorderLeftWidth + b.ActualPaddingLeft : 0;
double rightspacing = b.Position != CssConstants.Absolute ? b.ActualMarginRight + b.ActualBorderRightWidth + b.ActualPaddingRight : 0;
b.RectanglesReset();
b.MeasureWordsSize(g);
curx += leftspacing;
if (b.Words.Count > 0)
{
bool wrapNoWrapBox = false;
if (b.WhiteSpace == CssConstants.NoWrap && curx > startx)
{
var boxRight = curx;
foreach (var word in b.Words)
{
boxRight += word.FullWidth;
}
if (boxRight > limitRight)
{
wrapNoWrapBox = true;
}
}
if (DomUtils.IsBoxHasWhitespace(b))
{
curx += box.ActualWordSpacing;
}
foreach (var word in b.Words)
{
if (maxbottom - cury < box.ActualLineHeight)
{
maxbottom += box.ActualLineHeight - (maxbottom - cury);
}
if ((b.WhiteSpace != CssConstants.NoWrap && b.WhiteSpace != CssConstants.Pre && curx + word.Width + rightspacing > limitRight &&
(b.WhiteSpace != CssConstants.PreWrap || !word.IsSpaces)) ||
word.IsLineBreak || wrapNoWrapBox)
{
wrapNoWrapBox = false;
curx = startx;
// handle if line is wrapped for the first text element where parent has left margin\padding
if (b == box.Boxes[0] && !word.IsLineBreak && (word == b.Words[0] || (box.ParentBox != null && box.ParentBox.IsBlock)))
{
curx += box.ActualMarginLeft + box.ActualBorderLeftWidth + box.ActualPaddingLeft;
}
cury = maxbottom + linespacing;
line = new CssLineBox(blockbox);
if (word.IsImage || word.Equals(b.FirstWord))
{
curx += leftspacing;
}
}
line.ReportExistanceOf(word);
word.Left = curx;
word.Top = cury;
curx = word.Left + word.FullWidth;
maxRight = Math.Max(maxRight, word.Right);
maxbottom = Math.Max(maxbottom, word.Bottom);
if (b.Position == CssConstants.Absolute)
{
word.Left += box.ActualMarginLeft;
word.Top += box.ActualMarginTop;
}
}
}
else
{
FlowBox(g, blockbox, b, limitRight, linespacing, startx, ref line, ref curx, ref cury, ref maxRight, ref maxbottom);
}
curx += rightspacing;
}
// handle height setting
if (maxbottom - startY < box.ActualHeight)
{
maxbottom += box.ActualHeight - (maxbottom - startY);
}
// handle width setting
if (box.IsInline && 0 <= curx - startX && curx - startX < box.ActualWidth)
{
// hack for actual width handling
curx += box.ActualWidth - (curx - startX);
line.Rectangles.Add(box, new RRect(startX, startY, box.ActualWidth, box.ActualHeight));
}
// handle box that is only a whitespace
if (box.Text != null && box.Text.IsWhitespace() && !box.IsImage && box.IsInline && box.Boxes.Count == 0 && box.Words.Count == 0)
{
curx += box.ActualWordSpacing;
}
// hack to support specific absolute position elements
if (box.Position == CssConstants.Absolute)
{
curx = localCurx;
maxRight = localMaxRight;
maxbottom = localmaxbottom;
AdjustAbsolutePosition(box, 0, 0);
}
box.LastHostingLineBox = line;
}
/// <summary>
/// Offsets the rectangle of the specified linebox by the specified gap,
/// and goes deep for rectangles of children in that linebox.
/// </summary>
/// <param name="lineBox"></param>
/// <param name="gap"></param>
internal void OffsetRectangle(CssLineBox lineBox, double gap)
{
if (Rectangles.ContainsKey(lineBox))
{
var r = Rectangles[lineBox];
Rectangles[lineBox] = new RRect(r.X, r.Y + gap, r.Width, r.Height);
}
}
/// <summary>
/// Searches for the first word occurrence inside the box, on the specified linebox
/// </summary>
/// <param name="b"></param>
/// <param name="line"> </param>
/// <returns></returns>
internal CssRect FirstWordOccourence(CssBox b, CssLineBox line)
{
if (b.Words.Count == 0 && b.Boxes.Count == 0)
{
return null;
}
if (b.Words.Count > 0)
{
foreach (CssRect word in b.Words)
{
if (line.Words.Contains(word))
{
return word;
}
}
return null;
}
foreach (CssBox bb in b.Boxes)
{
CssRect w = FirstWordOccourence(bb, line);
if (w != null)
{
return w;
}
}
return null;
}
/// <summary>
/// Creates line boxes for the specified blockbox
/// </summary>
/// <param name="g"></param>
/// <param name="blockBox"></param>
public static void CreateLineBoxes(RGraphics g, CssBox blockBox)
{
ArgChecker.AssertArgNotNull(g, "g");
ArgChecker.AssertArgNotNull(blockBox, "blockBox");
blockBox.LineBoxes.Clear();
double limitRight = blockBox.ActualRight - blockBox.ActualPaddingRight - blockBox.ActualBorderRightWidth;
//Get the start x and y of the blockBox
double startx = blockBox.Location.X + blockBox.ActualPaddingLeft - 0 + blockBox.ActualBorderLeftWidth;
double starty = blockBox.Location.Y + blockBox.ActualPaddingTop - 0 + blockBox.ActualBorderTopWidth;
double curx = startx + blockBox.ActualTextIndent;
double cury = starty;
//Reminds the maximum bottom reached
double maxRight = startx;
double maxBottom = starty;
//First line box
CssLineBox line = new CssLineBox(blockBox);
//Flow words and boxes
FlowBox(g, blockBox, blockBox, limitRight, 0, startx, ref line, ref curx, ref cury, ref maxRight, ref maxBottom);
// if width is not restricted we need to lower it to the actual width
if (blockBox.ActualRight >= 90999)
{
blockBox.ActualRight = maxRight + blockBox.ActualPaddingRight + blockBox.ActualBorderRightWidth;
}
//Gets the rectangles for each line-box
foreach (var linebox in blockBox.LineBoxes)
{
ApplyAlignment(g, linebox);
ApplyRightToLeft(blockBox, linebox);
BubbleRectangles(blockBox, linebox);
linebox.AssignRectanglesToBoxes();
}
blockBox.ActualBottom = maxBottom + blockBox.ActualPaddingBottom + blockBox.ActualBorderBottomWidth;
// handle limiting block height when overflow is hidden
if (blockBox.Height != null && blockBox.Height != CssConstants.Auto && blockBox.Overflow == CssConstants.Hidden && blockBox.ActualBottom - blockBox.Location.Y > blockBox.ActualHeight)
{
blockBox.ActualBottom = blockBox.Location.Y + blockBox.ActualHeight;
}
}
/// <summary>
/// Recursively flows the content of the box using the inline model
/// </summary>
/// <param name="g">Device Info</param>
/// <param name="blockbox">Blockbox that contains the text flow</param>
/// <param name="box">Current box to flow its content</param>
/// <param name="limitRight">Maximum reached right</param>
/// <param name="linespacing">Space to use between rows of text</param>
/// <param name="startx">x starting coordinate for when breaking lines of text</param>
/// <param name="line">Current linebox being used</param>
/// <param name="curx">Current x coordinate that will be the left of the next word</param>
/// <param name="cury">Current y coordinate that will be the top of the next word</param>
/// <param name="maxRight">Maximum right reached so far</param>
/// <param name="maxbottom">Maximum bottom reached so far</param>
private static void FlowBox(RGraphics g, CssBox blockbox, CssBox box, double limitRight, double linespacing, double startx, ref CssLineBox line, ref double curx, ref double cury, ref double maxRight, ref double maxbottom)
{
var startX = curx;
var startY = cury;
box.FirstHostingLineBox = line;
var localCurx = curx;
var localMaxRight = maxRight;
var localmaxbottom = maxbottom;
foreach (CssBox b in box.Boxes)
{
double leftspacing = b.Position != CssConstants.Absolute ? b.ActualMarginLeft + b.ActualBorderLeftWidth + b.ActualPaddingLeft : 0;
double rightspacing = b.Position != CssConstants.Absolute ? b.ActualMarginRight + b.ActualBorderRightWidth + b.ActualPaddingRight : 0;
b.RectanglesReset();
b.MeasureWordsSize(g);
curx += leftspacing;
if (b.Words.Count > 0)
{
bool wrapNoWrapBox = false;
if (b.WhiteSpace == CssConstants.NoWrap && curx > startx)
{
var boxRight = curx;
foreach (var word in b.Words)
boxRight += word.FullWidth;
if (boxRight > limitRight)
wrapNoWrapBox = true;
}
if (DomUtils.IsBoxHasWhitespace(b))
curx += box.ActualWordSpacing;
foreach (var word in b.Words)
{
if (maxbottom - cury < box.ActualLineHeight)
maxbottom += box.ActualLineHeight - (maxbottom - cury);
if ((b.WhiteSpace != CssConstants.NoWrap && b.WhiteSpace != CssConstants.Pre && curx + word.Width + rightspacing > limitRight
&& (b.WhiteSpace != CssConstants.PreWrap || !word.IsSpaces))
|| word.IsLineBreak || wrapNoWrapBox)
{
wrapNoWrapBox = false;
curx = startx;
// handle if line is wrapped for the first text element where parent has left margin\padding
if (b == box.Boxes[0] && !word.IsLineBreak && (word == b.Words[0] || (box.ParentBox != null && box.ParentBox.IsBlock)))
curx += box.ActualMarginLeft + box.ActualBorderLeftWidth + box.ActualPaddingLeft;
cury = maxbottom + linespacing;
line = new CssLineBox(blockbox);
if (word.IsImage || word.Equals(b.FirstWord))
{
curx += leftspacing;
}
}
line.ReportExistanceOf(word);
word.Left = curx;
word.Top = cury;
curx = word.Left + word.FullWidth;
maxRight = Math.Max(maxRight, word.Right);
maxbottom = Math.Max(maxbottom, word.Bottom);
if (b.Position == CssConstants.Absolute)
{
word.Left += box.ActualMarginLeft;
word.Top += box.ActualMarginTop;
}
}
}
else
{
FlowBox(g, blockbox, b, limitRight, linespacing, startx, ref line, ref curx, ref cury, ref maxRight, ref maxbottom);
}
curx += rightspacing;
}
// handle height setting
if (maxbottom - startY < box.ActualHeight)
{
maxbottom += box.ActualHeight - (maxbottom - startY);
}
// handle width setting
if (box.IsInline && 0 <= curx - startX && curx - startX < box.ActualWidth)
{
// hack for actual width handling
curx += box.ActualWidth - (curx - startX);
line.Rectangles.Add(box, new RRect(startX, startY, box.ActualWidth, box.ActualHeight));
}
// handle box that is only a whitespace
if (box.Text != null && box.Text.IsWhitespace() && !box.IsImage && box.IsInline && box.Boxes.Count == 0 && box.Words.Count == 0)
{
curx += box.ActualWordSpacing;
}
// hack to support specific absolute position elements
if (box.Position == CssConstants.Absolute)
{
curx = localCurx;
maxRight = localMaxRight;
maxbottom = localmaxbottom;
AdjustAbsolutePosition(box, 0, 0);
}
box.LastHostingLineBox = line;
}
/// <summary>
/// Applies centered alignment to the text on the linebox
/// </summary>
/// <param name="g"></param>
/// <param name="lineBox"></param>
private static void ApplyJustifyAlignment(RGraphics g, CssLineBox lineBox)
{
if (lineBox.Equals(lineBox.OwnerBox.LineBoxes[lineBox.OwnerBox.LineBoxes.Count - 1]))
return;
double indent = lineBox.Equals(lineBox.OwnerBox.LineBoxes[0]) ? lineBox.OwnerBox.ActualTextIndent : 0f;
double textSum = 0f;
double words = 0f;
double availWidth = lineBox.OwnerBox.ClientRectangle.Width - indent;
// Gather text sum
foreach (CssRect w in lineBox.Words)
{
textSum += w.Width;
words += 1f;
}
if (words <= 0f)
return; //Avoid Zero division
double spacing = (availWidth - textSum) / words; //Spacing that will be used
double curx = lineBox.OwnerBox.ClientLeft + indent;
foreach (CssRect word in lineBox.Words)
{
word.Left = curx;
curx = word.Right + spacing;
if (word == lineBox.Words[lineBox.Words.Count - 1])
{
word.Left = lineBox.OwnerBox.ClientRight - word.Width;
}
}
}
/// <summary>
/// Get css word box under the given sub-tree at the given x,y location.<br/>
/// the location must be in correct scroll offset.
/// </summary>
/// <param name="lineBox">the line box to search in</param>
/// <param name="location">the location to find the box at</param>
/// <returns>css word box if exists or null</returns>
public static CssRect GetCssBoxWord(CssLineBox lineBox, RPoint location)
{
foreach (var rects in lineBox.Rectangles)
{
foreach (var word in rects.Key.Words)
{
// add word spacing to word width so sentence won't have hols in it when moving the mouse
var rect = word.Rectangle;
rect.Width += word.OwnerBox.ActualWordSpacing;
if (rect.Contains(location))
{
return word;
}
}
}
return null;
}
/// <summary>
/// Applies RTL direction to specific box words on the line.
/// </summary>
/// <param name="lineBox"></param>
/// <param name="box"></param>
private static void ApplyRightToLeftOnSingleBox(CssLineBox lineBox, CssBox box)
{
int leftWordIdx = -1;
int rightWordIdx = -1;
for (int i = 0; i < lineBox.Words.Count; i++)
{
if (lineBox.Words[i].OwnerBox == box)
{
if (leftWordIdx < 0)
leftWordIdx = i;
rightWordIdx = i;
}
}
if (leftWordIdx > -1 && rightWordIdx > leftWordIdx)
{
double left = lineBox.Words[leftWordIdx].Left;
double right = lineBox.Words[rightWordIdx].Right;
for (int i = leftWordIdx; i <= rightWordIdx; i++)
{
double diff = lineBox.Words[i].Left - left;
double wright = right - diff;
lineBox.Words[i].Left = wright - lineBox.Words[i].Width;
}
}
}
/// <summary>
/// Applies RTL direction to all the words on the line.
/// </summary>
/// <param name="line">the line to apply RTL to</param>
private static void ApplyRightToLeftOnLine(CssLineBox line)
{
if (line.Words.Count > 0)
{
double left = line.Words[0].Left;
double right = line.Words[line.Words.Count - 1].Right;
foreach (CssRect word in line.Words)
{
double diff = word.Left - left;
double wright = right - diff;
word.Left = wright - word.Width;
}
}
}
/// <summary>
/// Applies right to left direction to words
/// </summary>
/// <param name="blockBox"></param>
/// <param name="lineBox"></param>
private static void ApplyRightToLeft(CssBox blockBox, CssLineBox lineBox)
{
if (blockBox.Direction == CssConstants.Rtl)
{
ApplyRightToLeftOnLine(lineBox);
}
else
{
foreach (var box in lineBox.RelatedBoxes)
{
if (box.Direction == CssConstants.Rtl)
{
ApplyRightToLeftOnSingleBox(lineBox, box);
}
}
}
}
/// <summary>
/// Applies right alignment to the text on the linebox
/// </summary>
/// <param name="g"></param>
/// <param name="line"></param>
private static void ApplyRightAlignment(RGraphics g, CssLineBox line)
{
if (line.Words.Count == 0)
return;
CssRect lastWord = line.Words[line.Words.Count - 1];
double right = line.OwnerBox.ActualRight - line.OwnerBox.ActualPaddingRight - line.OwnerBox.ActualBorderRightWidth;
double diff = right - lastWord.Right - lastWord.OwnerBox.ActualBorderRightWidth - lastWord.OwnerBox.ActualPaddingRight;
if (diff > 0)
{
foreach (CssRect word in line.Words)
{
word.Left += diff;
}
foreach (CssBox b in line.Rectangles.Keys)
{
RRect r = b.Rectangles[line];
b.Rectangles[line] = new RRect(r.X + diff, r.Y, r.Width, r.Height);
}
}
}
/// <summary>
/// Simplest alignment, just arrange words.
/// </summary>
/// <param name="g"></param>
/// <param name="line"></param>
private static void ApplyLeftAlignment(RGraphics g, CssLineBox line)
{
//No alignment needed.
//foreach (LineBoxRectangle r in line.Rectangles)
//{
// double curx = r.Left + (r.Index == 0 ? r.OwnerBox.ActualPaddingLeft + r.OwnerBox.ActualBorderLeftWidth / 2 : 0);
// if (r.SpaceBefore) curx += r.OwnerBox.ActualWordSpacing;
// foreach (BoxWord word in r.Words)
// {
// word.Left = curx;
// word.Top = r.Top;// +r.OwnerBox.ActualPaddingTop + r.OwnerBox.ActualBorderTopWidth / 2;
// curx = word.Right + r.OwnerBox.ActualWordSpacing;
// }
//}
}
/// <summary>
/// Recursively creates the rectangles of the blockBox, by bubbling from deep to outside of the boxes
/// in the rectangle structure
/// </summary>
private static void BubbleRectangles(CssBox box, CssLineBox line)
{
if (box.Words.Count > 0)
{
double x = Single.MaxValue, y = Single.MaxValue, r = Single.MinValue, b = Single.MinValue;
List<CssRect> words = line.WordsOf(box);
if (words.Count > 0)
{
foreach (CssRect word in words)
{
// handle if line is wrapped for the first text element where parent has left margin\padding
var left = word.Left;
if (box == box.ParentBox.Boxes[0] && word == box.Words[0] && word == line.Words[0] && line != line.OwnerBox.LineBoxes[0] && !word.IsLineBreak)
left -= box.ParentBox.ActualMarginLeft + box.ParentBox.ActualBorderLeftWidth + box.ParentBox.ActualPaddingLeft;
x = Math.Min(x, left);
r = Math.Max(r, word.Right);
y = Math.Min(y, word.Top);
b = Math.Max(b, word.Bottom);
}
line.UpdateRectangle(box, x, y, r, b);
}
}
else
{
foreach (CssBox b in box.Boxes)
{
BubbleRectangles(b, line);
}
}
}
/// <summary>
/// Applies vertical alignment to the linebox
/// </summary>
/// <param name="g"></param>
/// <param name="lineBox"></param>
private static void ApplyVerticalAlignment(RGraphics g, CssLineBox lineBox)
{
double baseline = Single.MinValue;
foreach (var box in lineBox.Rectangles.Keys)
{
baseline = Math.Max(baseline, lineBox.Rectangles[box].Top);
}
var boxes = new List<CssBox>(lineBox.Rectangles.Keys);
foreach (CssBox box in boxes)
{
//Important notes on http://www.w3.org/TR/CSS21/tables.html#height-layout
switch (box.VerticalAlign)
{
case CssConstants.Sub:
lineBox.SetBaseLine(g, box, baseline + lineBox.Rectangles[box].Height * .2f);
break;
case CssConstants.Super:
lineBox.SetBaseLine(g, box, baseline - lineBox.Rectangles[box].Height * .2f);
break;
case CssConstants.TextTop:
break;
case CssConstants.TextBottom:
break;
case CssConstants.Top:
break;
case CssConstants.Bottom:
break;
case CssConstants.Middle:
break;
default:
//case: baseline
lineBox.SetBaseLine(g, box, baseline);
break;
}
}
}
/// <summary>
/// Applies vertical and horizontal alignment to words in lineboxes
/// </summary>
/// <param name="g"></param>
/// <param name="lineBox"></param>
private static void ApplyAlignment(RGraphics g, CssLineBox lineBox)
{
switch (lineBox.OwnerBox.TextAlign)
{
case CssConstants.Right:
ApplyRightAlignment(g, lineBox);
break;
case CssConstants.Center:
ApplyCenterAlignment(g, lineBox);
break;
case CssConstants.Justify:
ApplyJustifyAlignment(g, lineBox);
break;
default:
ApplyLeftAlignment(g, lineBox);
break;
}
ApplyVerticalAlignment(g, lineBox);
}