/// <summary>
/// Creates a new LineBox
/// </summary>
public CssLineBox(CssBox ownerBox)
{
_rects = new Dictionary<CssBox, RRect>();
_relatedBoxes = new List<CssBox>();
_words = new List<CssRect>();
_ownerBox = ownerBox;
_ownerBox.LineBoxes.Add(this);
}
public CssSpacingBox(CssBox tableBox, ref CssBox extendedBox, int startRow)
: base(tableBox, new HtmlTag("none", false, new Dictionary<string, string> { { "colspan", "1" } }))
{
_extendedBox = extendedBox;
Display = CssConstants.None;
_startRow = startRow;
_endRow = startRow + Int32.Parse(extendedBox.GetAttribute("rowspan", "1")) - 1;
}
/// <summary>
/// Recursively searches for the parent with the specified HTML Tag name
/// </summary>
/// <param name="root"></param>
/// <param name="tagName"></param>
/// <param name="box"></param>
public static CssBox FindParent(CssBox root, string tagName, CssBox box)
{
if (box == null)
{
return root;
}
if (box.HtmlTag != null && box.HtmlTag.Name.Equals(tagName, StringComparison.CurrentCultureIgnoreCase))
{
return box.ParentBox ?? root;
}
return FindParent(root, tagName, box.ParentBox);
}
/// <summary>
/// Check if the given box contains only inline child boxes.
/// </summary>
/// <param name="box">the box to check</param>
/// <returns>true - only inline child boxes, false - otherwise</returns>
public static bool ContainsInlinesOnly(CssBox box)
{
foreach (CssBox b in box.Boxes)
{
if (!b.IsInline)
{
return false;
}
}
return true;
}
/// <summary>
/// Applies special vertical alignment for table-cells
/// </summary>
/// <param name="g"></param>
/// <param name="cell"></param>
public static void ApplyCellVerticalAlignment(RGraphics g, CssBox cell)
{
ArgChecker.AssertArgNotNull(g, "g");
ArgChecker.AssertArgNotNull(cell, "cell");
if (cell.VerticalAlign == CssConstants.Top || cell.VerticalAlign == CssConstants.Baseline)
return;
double cellbot = cell.ClientBottom;
double bottom = cell.GetMaximumBottom(cell, 0f);
double dist = 0f;
if (cell.VerticalAlign == CssConstants.Bottom)
{
dist = cellbot - bottom;
}
else if (cell.VerticalAlign == CssConstants.Middle)
{
dist = (cellbot - bottom) / 2;
}
foreach (CssBox b in cell.Boxes)
{
b.OffsetTop(dist);
}
//float top = cell.ClientTop;
//float bottom = cell.ClientBottom;
//bool middle = cell.VerticalAlign == CssConstants.Middle;
//foreach (LineBox line in cell.LineBoxes)
//{
// for (int i = 0; i < line.RelatedBoxes.Count; i++)
// {
// double diff = bottom - line.RelatedBoxes[i].Rectangles[line].Bottom;
// if (middle) diff /= 2f;
// RectangleF r = line.RelatedBoxes[i].Rectangles[line];
// line.RelatedBoxes[i].Rectangles[line] = new RectangleF(r.X, r.Y + diff, r.Width, r.Height);
// }
// foreach (BoxWord word in line.Words)
// {
// double gap = word.Top - top;
// word.Top = bottom - gap - word.Height;
// }
//}
}
/// <summary>
/// Draws all the border of the box with respect to style, width, etc.
/// </summary>
/// <param name="g">the device to draw into</param>
/// <param name="box">the box to draw borders for</param>
/// <param name="rect">the bounding rectangle to draw in</param>
/// <param name="isFirst">is it the first rectangle of the element</param>
/// <param name="isLast">is it the last rectangle of the element</param>
public static void DrawBoxBorders(RGraphics g, CssBox box, RRect rect, bool isFirst, bool isLast)
{
if (rect.Width > 0 && rect.Height > 0)
{
if (!(string.IsNullOrEmpty(box.BorderTopStyle) || box.BorderTopStyle == CssConstants.None || box.BorderTopStyle == CssConstants.Hidden) && box.ActualBorderTopWidth > 0)
{
DrawBorder(Border.Top, box, g, rect, isFirst, isLast);
}
if (isFirst && !(string.IsNullOrEmpty(box.BorderLeftStyle) || box.BorderLeftStyle == CssConstants.None || box.BorderLeftStyle == CssConstants.Hidden) && box.ActualBorderLeftWidth > 0)
{
DrawBorder(Border.Left, box, g, rect, true, isLast);
}
if (!(string.IsNullOrEmpty(box.BorderBottomStyle) || box.BorderBottomStyle == CssConstants.None || box.BorderBottomStyle == CssConstants.Hidden) && box.ActualBorderBottomWidth > 0)
{
DrawBorder(Border.Bottom, box, g, rect, isFirst, isLast);
}
if (isLast && !(string.IsNullOrEmpty(box.BorderRightStyle) || box.BorderRightStyle == CssConstants.None || box.BorderRightStyle == CssConstants.Hidden) && box.ActualBorderRightWidth > 0)
{
DrawBorder(Border.Right, box, g, rect, isFirst, true);
}
}
}
/// <summary>
/// Draw the background image of the given box in the given rectangle.<br/>
/// Handle background-repeat and background-position values.
/// </summary>
/// <param name="g">the device to draw into</param>
/// <param name="box">the box to draw its background image</param>
/// <param name="imageLoadHandler">the handler that loads image to draw</param>
/// <param name="rectangle">the rectangle to draw image in</param>
public static void DrawBackgroundImage(RGraphics g, CssBox box, ImageLoadHandler imageLoadHandler, RRect rectangle)
{
// image size depends if specific rectangle given in image loader
var imgSize = new RSize(imageLoadHandler.Rectangle == RRect.Empty ? imageLoadHandler.Image.Width : imageLoadHandler.Rectangle.Width,
imageLoadHandler.Rectangle == RRect.Empty ? imageLoadHandler.Image.Height : imageLoadHandler.Rectangle.Height);
// get the location by BackgroundPosition value
var location = GetLocation(box.BackgroundPosition, rectangle, imgSize);
var srcRect = imageLoadHandler.Rectangle == RRect.Empty
? new RRect(0, 0, imgSize.Width, imgSize.Height)
: new RRect(imageLoadHandler.Rectangle.Left, imageLoadHandler.Rectangle.Top, imgSize.Width, imgSize.Height);
// initial image destination rectangle
var destRect = new RRect(location, imgSize);
// need to clip so repeated image will be cut on rectangle
var lRectangle = rectangle;
lRectangle.Intersect(g.GetClip());
g.PushClip(lRectangle);
switch (box.BackgroundRepeat)
{
case "no-repeat":
g.DrawImage(imageLoadHandler.Image, destRect, srcRect);
break;
case "repeat-x":
DrawRepeatX(g, imageLoadHandler, rectangle, srcRect, destRect, imgSize);
break;
case "repeat-y":
DrawRepeatY(g, imageLoadHandler, rectangle, srcRect, destRect, imgSize);
break;
default:
DrawRepeat(g, imageLoadHandler, rectangle, srcRect, destRect, imgSize);
break;
}
g.PopClip();
}
/// <summary>
/// Clip the region the graphics will draw on by the overflow style of the containing block.<br/>
/// Recursively travel up the tree to find containing block that has overflow style set to hidden. if not
/// block found there will be no clipping and null will be returned.
/// </summary>
/// <param name="g">the graphics to clip</param>
/// <param name="box">the box that is rendered to get containing blocks</param>
/// <returns>true - was clipped, false - not clipped</returns>
public static bool ClipGraphicsByOverflow(RGraphics g, CssBox box)
{
var containingBlock = box.ContainingBlock;
while (true)
{
if (containingBlock.Overflow == CssConstants.Hidden)
{
var prevClip = g.GetClip();
var rect = box.ContainingBlock.ClientRectangle;
rect.X -= 2; // TODO:a find better way to fix it
rect.Width += 2;
rect.Offset(box.HtmlContainer.ScrollOffset);
rect.Intersect(prevClip);
g.PushClip(rect);
return true;
}
var cBlock = containingBlock.ContainingBlock;
if (cBlock == containingBlock)
return false;
containingBlock = cBlock;
}
}
/// <summary>
/// Gets the spanned width of a cell (With of all columns it spans minus one).
/// </summary>
private double GetSpannedMinWidth(CssBox row, CssBox cell, int realcolindex, int colspan)
{
double w = 0f;
for (int i = realcolindex; i < row.Boxes.Count || i < realcolindex + colspan - 1; i++)
{
if (i < GetColumnMinWidths().Length)
w += GetColumnMinWidths()[i];
}
return w;
}
/// <summary>
/// Gets the cells width, taking colspan and being in the specified column
/// </summary>
/// <param name="column"></param>
/// <param name="b"></param>
/// <returns></returns>
private double GetCellWidth(int column, CssBox b)
{
double colspan = Convert.ToSingle(GetColSpan(b));
double sum = 0f;
for (int i = column; i < column + colspan; i++)
{
if (column >= _columnWidths.Length)
break;
if (_columnWidths.Length <= i)
break;
sum += _columnWidths[i];
}
sum += (colspan - 1) * GetHorizontalSpacing();
return sum; // -b.ActualBorderLeftWidth - b.ActualBorderRightWidth - b.ActualPaddingRight - b.ActualPaddingLeft;
}
/// <summary>
/// Recursively measures words inside the box
/// </summary>
/// <param name="box">the box to measure</param>
/// <param name="g">Device to use</param>
private static void MeasureWords(CssBox box, RGraphics g)
{
if (box != null)
{
foreach (var childBox in box.Boxes)
{
childBox.MeasureWordsSize(g);
MeasureWords(childBox, g);
}
}
}
/// <summary>
/// Gets the rowspan of the specified box
/// </summary>
/// <param name="b"></param>
private static int GetRowSpan(CssBox b)
{
string att = b.GetAttribute("rowspan", "1");
int rowspan;
if (!int.TryParse(att, out rowspan))
{
return 1;
}
return rowspan;
}
/// <summary>
/// Gets the colspan of the specified box
/// </summary>
/// <param name="b"></param>
private static int GetColSpan(CssBox b)
{
string att = b.GetAttribute("colspan", "1");
int colspan;
if (!int.TryParse(att, out colspan))
{
return 1;
}
return colspan;
}
/// <summary>
///
/// </summary>
/// <param name="g"></param>
/// <param name="tableBox"> </param>
public static void PerformLayout(RGraphics g, CssBox tableBox)
{
ArgChecker.AssertArgNotNull(g, "g");
ArgChecker.AssertArgNotNull(tableBox, "tableBox");
try
{
var table = new CssLayoutEngineTable(tableBox);
table.Layout(g);
}
catch (Exception ex)
{
tableBox.HtmlContainer.ReportError(HtmlRenderErrorType.Layout, "Failed table layout", ex);
}
}
/// <summary>
/// Create new css box for the given parent with the given html tag.<br/>
/// </summary>
/// <param name="tag">the html tag to define the box</param>
/// <param name="parent">the box to add the new box to it as child</param>
/// <returns>the new box</returns>
public static CssBox CreateBox(HtmlTag tag, CssBox parent = null)
{
ArgChecker.AssertArgNotNull(tag, "tag");
if (tag.Name == HtmlConstants.Img)
{
return new CssBoxImage(parent, tag);
}
if (tag.Name == HtmlConstants.Iframe)
{
return new CssBoxFrame(parent, tag);
}
if (tag.Name == HtmlConstants.Hr)
{
return new CssBoxHr(parent, tag);
}
return new CssBox(parent, tag);
}
/// <summary>
/// Init.
/// </summary>
/// <param name="parent">the parent box of this box</param>
/// <param name="tag">the html tag data of this box</param>
public CssBoxFrame(CssBox parent, HtmlTag tag)
: base(parent, tag)
{
_imageWord = new CssRectImage(this);
Words.Add(_imageWord);
Uri uri;
if (Uri.TryCreate(GetAttribute("src"), UriKind.Absolute, out uri))
{
if (uri.Host.IndexOf("youtube.com", StringComparison.InvariantCultureIgnoreCase) > -1)
{
_isVideo = true;
LoadYoutubeDataAsync(uri);
}
else if (uri.Host.IndexOf("vimeo.com", StringComparison.InvariantCultureIgnoreCase) > -1)
{
_isVideo = true;
LoadVimeoDataAsync(uri);
}
}
if (!_isVideo)
{
SetErrorBorder();
}
}
/// <summary>
/// Init.
/// </summary>
public HoverBoxBlock(CssBox cssBox, CssBlock cssBlock)
{
_cssBox = cssBox;
_cssBlock = cssBlock;
}
/// <summary>
/// Create new css box for the given parent with the given optional html tag and insert it either
/// at the end or before the given optional box.<br/>
/// If no html tag is given the box will be anonymous.<br/>
/// If no before box is given the new box will be added at the end of parent boxes collection.<br/>
/// If before box doesn't exists in parent box exception is thrown.<br/>
/// </summary>
/// <remarks>
/// To learn more about anonymous inline boxes visit: http://www.w3.org/TR/CSS21/visuren.html#anonymous
/// </remarks>
/// <param name="parent">the box to add the new box to it as child</param>
/// <param name="tag">optional: the html tag to define the box</param>
/// <param name="before">optional: to insert as specific location in parent box</param>
/// <returns>the new box</returns>
public static CssBox CreateBox(CssBox parent, HtmlTag tag = null, CssBox before = null)
{
ArgChecker.AssertArgNotNull(parent, "parent");
var newBox = new CssBox(parent, tag);
newBox.InheritStyle();
if (before != null)
{
newBox.SetBeforeBox(before);
}
return newBox;
}
/// <summary>
/// Gets the cell column index checking its position and other cells colspans
/// </summary>
/// <param name="row"></param>
/// <param name="cell"></param>
/// <returns></returns>
private static int GetCellRealColumnIndex(CssBox row, CssBox cell)
{
int i = 0;
foreach (CssBox b in row.Boxes)
{
if (b.Equals(cell))
break;
i += GetColSpan(b);
}
return i;
}
/// <summary>
/// Move all child boxes from <paramref name="fromBox"/> to this box.
/// </summary>
/// <param name="fromBox">the box to move all its child boxes from</param>
public void SetAllBoxes(CssBox fromBox)
{
foreach (var childBox in fromBox._boxes)
childBox._parentBox = this;
_boxes.AddRange(fromBox._boxes);
fromBox._boxes.Clear();
}
/// <summary>
/// Gets the actual horizontal spacing of the table
/// </summary>
private static double GetHorizontalSpacing(CssBox box)
{
return box.BorderCollapse == CssConstants.Collapse ? -1f : box.ActualBorderSpacingHorizontal;
}
/// <summary>
/// Set this box in
/// </summary>
/// <param name="before"></param>
public void SetBeforeBox(CssBox before)
{
int index = _parentBox.Boxes.IndexOf(before);
if (index < 0)
throw new Exception("before box doesn't exist on parent");
_parentBox.Boxes.Remove(this);
_parentBox.Boxes.Insert(index, this);
}
/// <summary>
/// Gets the span attribute of the tag of the specified box
/// </summary>
/// <param name="b"></param>
private static int GetSpan(CssBox b)
{
double f = CssValueParser.ParseNumber(b.GetAttribute("span"), 1);
return Math.Max(1, Convert.ToInt32(f));
}
/// <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>
/// Get the table boxes into the proper fields.
/// </summary>
private void AssignBoxKinds()
{
foreach (var box in _tableBox.Boxes)
{
switch (box.Display)
{
case CssConstants.TableCaption:
_caption = box;
break;
case CssConstants.TableRow:
_bodyrows.Add(box);
break;
case CssConstants.TableRowGroup:
foreach (CssBox childBox in box.Boxes)
if (childBox.Display == CssConstants.TableRow)
_bodyrows.Add(childBox);
break;
case CssConstants.TableHeaderGroup:
if (_headerBox != null)
_bodyrows.Add(box);
else
_headerBox = box;
break;
case CssConstants.TableFooterGroup:
if (_footerBox != null)
_bodyrows.Add(box);
else
_footerBox = box;
break;
case CssConstants.TableColumn:
for (int i = 0; i < GetSpan(box); i++)
_columns.Add(box);
break;
case CssConstants.TableColumnGroup:
if (box.Boxes.Count == 0)
{
int gspan = GetSpan(box);
for (int i = 0; i < gspan; i++)
{
_columns.Add(box);
}
}
else
{
foreach (CssBox bb in box.Boxes)
{
int bbspan = GetSpan(bb);
for (int i = 0; i < bbspan; i++)
{
_columns.Add(bb);
}
}
}
break;
}
}
if (_headerBox != null)
_allRows.AddRange(_headerBox.Boxes);
_allRows.AddRange(_bodyrows);
if (_footerBox != null)
_allRows.AddRange(_footerBox.Boxes);
}
/// <summary>
/// Gets the maximum bottom of the boxes inside the startBox
/// </summary>
/// <param name="startBox"></param>
/// <param name="currentMaxBottom"></param>
/// <returns></returns>
internal double GetMaximumBottom(CssBox startBox, double currentMaxBottom)
{
foreach (var line in startBox.Rectangles.Keys)
{
currentMaxBottom = Math.Max(currentMaxBottom, startBox.Rectangles[line].Bottom);
}
foreach (var b in startBox.Boxes)
{
currentMaxBottom = Math.Max(currentMaxBottom, GetMaximumBottom(b, currentMaxBottom));
}
return currentMaxBottom;
}
/// <summary>
/// Init.
/// </summary>
/// <param name="tableBox"></param>
private CssLayoutEngineTable(CssBox tableBox)
{
_tableBox = tableBox;
}
/// <summary>
/// Gets the rectangles where inline box will be drawn. See Remarks for more info.
/// </summary>
/// <returns>Rectangles where content should be placed</returns>
/// <remarks>
/// Inline boxes can be split across different LineBoxes, that's why this method
/// Delivers a rectangle for each LineBox related to this box, if inline.
/// </remarks>
/// <summary>
/// Inherits inheritable values from parent.
/// </summary>
internal new void InheritStyle(CssBox box = null, bool everything = false)
{
base.InheritStyle(box ?? ParentBox, everything);
}
/// <summary>
/// Get the table cells spacing for all the cells in the table.<br/>
/// Used to calculate the spacing the table has in addition to regular padding and borders.
/// </summary>
/// <param name="tableBox">the table box to calculate the spacing for</param>
/// <returns>the calculated spacing</returns>
public static double GetTableSpacing(CssBox tableBox)
{
int count = 0;
int columns = 0;
foreach (var box in tableBox.Boxes)
{
if (box.Display == CssConstants.TableColumn)
{
columns += GetSpan(box);
}
else if (box.Display == CssConstants.TableRowGroup)
{
foreach (CssBox cr in tableBox.Boxes)
{
count++;
if (cr.Display == CssConstants.TableRow)
columns = Math.Max(columns, cr.Boxes.Count);
}
}
else if (box.Display == CssConstants.TableRow)
{
count++;
columns = Math.Max(columns, box.Boxes.Count);
}
// limit the amount of rows to process for performance
if (count > 30)
break;
}
// +1 columns because padding is between the cell and table borders
return (columns + 1) * GetHorizontalSpacing(tableBox);
}
/// <summary>
/// Creates a new BoxWord which represents an image
/// </summary>
/// <param name="owner">the CSS box owner of the word</param>
public CssRectImage(CssBox owner)
: base(owner)
{
}
