/// <summary>
/// Paints the fragment
/// </summary>
/// <param name="g">the device to draw to</param>
protected override void PaintImp(RGraphics g)
{
var offset = HtmlContainer != null ? HtmlContainer.ScrollOffset : RPoint.Empty;
var rect = new RRect(Bounds.X + offset.X, Bounds.Y + offset.Y, Bounds.Width, Bounds.Height);
if (rect.Height > 2 && RenderUtils.IsColorVisible(ActualBackgroundColor))
{
g.DrawRectangle(g.GetSolidBrush(ActualBackgroundColor), rect.X, rect.Y, rect.Width, rect.Height);
}
var b1 = g.GetSolidBrush(ActualBorderTopColor);
BordersDrawHandler.DrawBorder(Border.Top, g, this, b1, rect);
if (rect.Height > 1)
{
var b2 = g.GetSolidBrush(ActualBorderLeftColor);
BordersDrawHandler.DrawBorder(Border.Left, g, this, b2, rect);
var b3 = g.GetSolidBrush(ActualBorderRightColor);
BordersDrawHandler.DrawBorder(Border.Right, g, this, b3, rect);
var b4 = g.GetSolidBrush(ActualBorderBottomColor);
BordersDrawHandler.DrawBorder(Border.Bottom, g, this, b4, rect);
}
}
/// <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>
/// Perform the layout of the html container by given size restrictions returning the final size.<br/>
/// The layout can be effected by the HTML content in the <paramref name="htmlContainer"/> if <paramref name="autoSize"/> or
/// <paramref name="autoSizeHeightOnly"/> is set to true.<br/>
/// Handle minimum and maximum size restrictions.<br/>
/// Handle auto size and auto size for height only. if <paramref name="autoSize"/> is true <paramref name="autoSizeHeightOnly"/>
/// is ignored.<br/>
/// </summary>
/// <param name="g">the graphics used for layout</param>
/// <param name="htmlContainer">the html container to layout</param>
/// <param name="size">the current size</param>
/// <param name="minSize">the min size restriction - can be empty for no restriction</param>
/// <param name="maxSize">the max size restriction - can be empty for no restriction</param>
/// <param name="autoSize">if to modify the size (width and height) by html content layout</param>
/// <param name="autoSizeHeightOnly">if to modify the height by html content layout</param>
public static RSize Layout(RGraphics g, HtmlContainerInt htmlContainer, RSize size, RSize minSize, RSize maxSize, bool autoSize, bool autoSizeHeightOnly)
{
if (autoSize)
htmlContainer.MaxSize = new RSize(0, 0);
else if (autoSizeHeightOnly)
htmlContainer.MaxSize = new RSize(size.Width, 0);
else
htmlContainer.MaxSize = size;
htmlContainer.PerformLayout(g);
RSize newSize = size;
if (autoSize || autoSizeHeightOnly)
{
if (autoSize)
{
if (maxSize.Width > 0 && maxSize.Width < htmlContainer.ActualSize.Width)
{
// to allow the actual size be smaller than max we need to set max size only if it is really larger
htmlContainer.MaxSize = maxSize;
htmlContainer.PerformLayout(g);
}
else if (minSize.Width > 0 && minSize.Width > htmlContainer.ActualSize.Width)
{
// if min size is larger than the actual we need to re-layout so all 100% layouts will be correct
htmlContainer.MaxSize = new RSize(minSize.Width, 0);
htmlContainer.PerformLayout(g);
}
newSize = htmlContainer.ActualSize;
}
else if (Math.Abs(size.Height - htmlContainer.ActualSize.Height) > 0.01)
{
var prevWidth = size.Width;
// make sure the height is not lower than min if given
newSize.Height = minSize.Height > 0 && minSize.Height > htmlContainer.ActualSize.Height
? minSize.Height
: htmlContainer.ActualSize.Height;
// handle if changing the height of the label affects the desired width and those require re-layout
if (Math.Abs(prevWidth - size.Width) > 0.01)
return Layout(g, htmlContainer, size, minSize, maxSize, false, true);
}
}
return newSize;
}
/// <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>
/// 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>
/// Analyzes the Table and assigns values to this CssTable object.
/// To be called from the constructor
/// </summary>
private void Layout(RGraphics g)
{
MeasureWords(_tableBox, g);
// get the table boxes into the proper fields
AssignBoxKinds();
// Insert EmptyBoxes for vertical cell spanning.
InsertEmptyBoxes();
// Determine Row and Column Count, and ColumnWidths
var availCellSpace = CalculateCountAndWidth();
DetermineMissingColumnWidths(availCellSpace);
// Check for minimum sizes (increment widths if necessary)
EnforceMinimumSize();
// While table width is larger than it should, and width is reducible
EnforceMaximumSize();
// Ensure there's no padding
_tableBox.PaddingLeft = _tableBox.PaddingTop = _tableBox.PaddingRight = _tableBox.PaddingBottom = "0";
//Actually layout cells!
LayoutCells(g);
}
/// <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>
/// Draw play over the iframe if we found link url.
/// </summary>
private void DrawPlay(RGraphics g, RRect rect)
{
if (_isVideo && _imageWord.Width > 70 && _imageWord.Height > 50)
{
var prevMode = g.SetAntiAliasSmoothingMode();
var size = new RSize(60, 40);
var left = rect.Left + (rect.Width - size.Width) / 2;
var top = rect.Top + (rect.Height - size.Height) / 2;
g.DrawRectangle(g.GetSolidBrush(RColor.FromArgb(160, 0, 0, 0)), left, top, size.Width, size.Height);
RPoint[] points =
{
new RPoint(left + size.Width / 3f + 1,top + 3 * size.Height / 4f),
new RPoint(left + size.Width / 3f + 1, top + size.Height / 4f),
new RPoint(left + 2 * size.Width / 3f + 1, top + size.Height / 2f)
};
g.DrawPolygon(g.GetSolidBrush(RColor.White), points);
g.ReturnPreviousSmoothingMode(prevMode);
}
}
/// <summary>
/// Paints the fragment
/// </summary>
/// <param name="g">the device to draw to</param>
protected override void PaintImp(RGraphics g)
{
var rects = CommonUtils.GetFirstValueOrDefault(Rectangles);
RPoint offset = HtmlContainer != null ? HtmlContainer.ScrollOffset : RPoint.Empty;
rects.Offset(offset);
var clipped = RenderUtils.ClipGraphicsByOverflow(g, this);
PaintBackground(g, rects, true, true);
BordersDrawHandler.DrawBoxBorders(g, this, rects, true, true);
var word = Words[0];
var tmpRect = word.Rectangle;
tmpRect.Offset(offset);
tmpRect.Height -= ActualBorderTopWidth + ActualBorderBottomWidth + ActualPaddingTop + ActualPaddingBottom;
tmpRect.Y += ActualBorderTopWidth + ActualPaddingTop;
tmpRect.X = Math.Floor(tmpRect.X);
tmpRect.Y = Math.Floor(tmpRect.Y);
var rect = tmpRect;
DrawImage(g, offset, rect);
DrawTitle(g, rect);
DrawPlay(g, rect);
if (clipped)
g.PopClip();
}
public override double GetWhitespaceWidth(RGraphics graphics)
{
if (_whitespaceWidth < 0)
{
_whitespaceWidth = graphics.MeasureString(" ", this).Width;
}
return _whitespaceWidth;
}
/// <summary>
/// Paints the background of the box
/// </summary>
/// <param name="g">the device to draw into</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>
protected void PaintBackground(RGraphics g, RRect rect, bool isFirst, bool isLast)
{
if (rect.Width > 0 && rect.Height > 0)
{
RBrush brush = null;
if (BackgroundGradient != CssConstants.None)
{
brush = g.GetLinearGradientBrush(rect, ActualBackgroundColor, ActualBackgroundGradient, ActualBackgroundGradientAngle);
}
else if (RenderUtils.IsColorVisible(ActualBackgroundColor))
{
brush = g.GetSolidBrush(ActualBackgroundColor);
}
if (brush != null)
{
// TODO:a handle it correctly (tables background)
// if (isLast)
// rectangle.Width -= ActualWordSpacing + CssUtils.GetWordEndWhitespace(ActualFont);
RGraphicsPath roundrect = null;
if (IsRounded)
{
roundrect = RenderUtils.GetRoundRect(g, rect, ActualCornerNw, ActualCornerNe, ActualCornerSe, ActualCornerSw);
}
Object prevMode = null;
if (HtmlContainer != null && !HtmlContainer.AvoidGeometryAntialias && IsRounded)
{
prevMode = g.SetAntiAliasSmoothingMode();
}
if (roundrect != null)
{
g.DrawPath(brush, roundrect);
}
else
{
g.DrawRectangle(brush, Math.Ceiling(rect.X), Math.Ceiling(rect.Y), rect.Width, rect.Height);
}
g.ReturnPreviousSmoothingMode(prevMode);
if (roundrect != null)
roundrect.Dispose();
brush.Dispose();
}
if (_imageLoadHandler != null && _imageLoadHandler.Image != null && isFirst)
{
BackgroundImageDrawHandler.DrawBackgroundImage(g, this, _imageLoadHandler, rect);
}
}
}
/// <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 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 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>
/// Assigns words its width and height
/// </summary>
/// <param name="g"></param>
internal virtual void MeasureWordsSize(RGraphics g)
{
if (!_wordsSizeMeasured)
{
if (BackgroundImage != CssConstants.None && _imageLoadHandler == null)
{
_imageLoadHandler = new ImageLoadHandler(HtmlContainer, OnImageLoadComplete);
_imageLoadHandler.LoadImage(BackgroundImage, HtmlTag != null ? HtmlTag.Attributes : null);
}
MeasureWordSpacing(g);
if (Words.Count > 0)
{
foreach (var boxWord in Words)
{
boxWord.Width = boxWord.Text != "\n" ? g.MeasureString(boxWord.Text, ActualFont).Width : 0;
boxWord.Height = ActualFont.Height;
}
}
_wordsSizeMeasured = true;
}
}
/// <summary>
/// Get brush for selection background depending if it has external and if alpha is required for images.
/// </summary>
/// <param name="g"></param>
/// <param name="forceAlpha">used for images so they will have alpha effect</param>
protected RBrush GetSelectionBackBrush(RGraphics g, bool forceAlpha)
{
var backColor = HtmlContainer.SelectionBackColor;
if (backColor != RColor.Empty) {
if (forceAlpha && backColor.A > 180)
return g.GetSolidBrush(RColor.FromArgb(180, backColor.R, backColor.G, backColor.B));
return g.GetSolidBrush(backColor);
}
return g.GetSolidBrush(CssUtils.DefaultSelectionBackcolor);
}
/// <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>
/// Paints the text decoration (underline/strike-through/over-line)
/// </summary>
/// <param name="g">the device to draw into</param>
/// <param name="rectangle"> </param>
/// <param name="isFirst"> </param>
/// <param name="isLast"> </param>
protected void PaintDecoration(RGraphics g, RRect rectangle, bool isFirst, bool isLast)
{
if (string.IsNullOrEmpty(TextDecoration) || TextDecoration == CssConstants.None)
return;
double y = 0f;
if (TextDecoration == CssConstants.Underline)
{
y = Math.Round(rectangle.Top + ActualFont.UnderlineOffset);
}
else if (TextDecoration == CssConstants.LineThrough)
{
y = rectangle.Top + rectangle.Height / 2f;
}
else if (TextDecoration == CssConstants.Overline)
{
y = rectangle.Top;
}
y -= ActualPaddingBottom - ActualBorderBottomWidth;
double x1 = rectangle.X;
if (isFirst)
x1 += ActualPaddingLeft + ActualBorderLeftWidth;
double x2 = rectangle.Right;
if (isLast)
x2 -= ActualPaddingRight + ActualBorderRightWidth;
var pen = g.GetPen(ActualColor);
pen.Width = 1;
pen.DashStyle = RDashStyle.Solid;
g.DrawLine(pen, x1, y, x2, y);
}
/// <summary>
/// Paints the fragment
/// </summary>
/// <param name="g">the device to draw to</param>
protected virtual void PaintImp(RGraphics g)
{
if (Display != CssConstants.None && (Display != CssConstants.TableCell || EmptyCells != CssConstants.Hide || !IsSpaceOrEmpty))
{
var clipped = RenderUtils.ClipGraphicsByOverflow(g, this);
var areas = Rectangles.Count == 0 ? new List<RRect>(new[] { Bounds }) : new List<RRect>(Rectangles.Values);
RRect[] rects = areas.ToArray();
RPoint offset = HtmlContainer.ScrollOffset;
for (int i = 0; i < rects.Length; i++)
{
var actualRect = rects[i];
actualRect.Offset(offset);
PaintBackground(g, actualRect, i == 0, i == rects.Length - 1);
BordersDrawHandler.DrawBoxBorders(g, this, actualRect, i == 0, i == rects.Length - 1);
}
PaintWords(g, offset);
for (int i = 0; i < rects.Length; i++)
{
var actualRect = rects[i];
actualRect.Offset(offset);
PaintDecoration(g, actualRect, i == 0, i == rects.Length - 1);
}
// split paint to handle z-order
foreach (CssBox b in Boxes)
{
if (b.Position != CssConstants.Absolute)
b.Paint(g);
}
foreach (CssBox b in Boxes)
{
if (b.Position == CssConstants.Absolute)
b.Paint(g);
}
if (clipped)
g.PopClip();
if (_listItemBox != null)
{
_listItemBox.Paint(g);
}
}
}
/// <summary>
/// Assigns words its width and height
/// </summary>
/// <param name="g">the device to use</param>
internal override void MeasureWordsSize(RGraphics g)
{
if (!_wordsSizeMeasured)
{
MeasureWordSpacing(g);
_wordsSizeMeasured = true;
}
CssLayoutEngine.MeasureImageSize(_imageWord);
}
/// <summary>
/// Measures the bounds of box and children, recursively.<br/>
/// Performs layout of the DOM structure creating lines by set bounds restrictions.<br/>
/// </summary>
/// <param name="g">Device context to use</param>
protected virtual void PerformLayoutImp(RGraphics g)
{
if (Display != CssConstants.None)
{
RectanglesReset();
MeasureWordsSize(g);
}
if (IsBlock || Display == CssConstants.ListItem || Display == CssConstants.Table || Display == CssConstants.InlineTable || Display == CssConstants.TableCell)
{
// Because their width and height are set by CssTable
if (Display != CssConstants.TableCell && Display != CssConstants.Table)
{
double width = ContainingBlock.Size.Width
- ContainingBlock.ActualPaddingLeft - ContainingBlock.ActualPaddingRight
- ContainingBlock.ActualBorderLeftWidth - ContainingBlock.ActualBorderRightWidth;
if (Width != CssConstants.Auto && !string.IsNullOrEmpty(Width))
{
width = CssValueParser.ParseLength(Width, width, this);
}
Size = new RSize(width, Size.Height);
// must be separate because the margin can be calculated by percentage of the width
Size = new RSize(width - ActualMarginLeft - ActualMarginRight, Size.Height);
}
if (Display != CssConstants.TableCell)
{
var prevSibling = DomUtils.GetPreviousSibling(this);
double left = ContainingBlock.Location.X + ContainingBlock.ActualPaddingLeft + ActualMarginLeft + ContainingBlock.ActualBorderLeftWidth;
double top = (prevSibling == null && ParentBox != null ? ParentBox.ClientTop : ParentBox == null ? Location.Y : 0) + MarginTopCollapse(prevSibling) + (prevSibling != null ? prevSibling.ActualBottom + prevSibling.ActualBorderBottomWidth : 0);
Location = new RPoint(left, top);
ActualBottom = top;
}
//If we're talking about a table here..
if (Display == CssConstants.Table || Display == CssConstants.InlineTable)
{
CssLayoutEngineTable.PerformLayout(g, this);
}
else
{
//If there's just inline boxes, create LineBoxes
if (DomUtils.ContainsInlinesOnly(this))
{
ActualBottom = Location.Y;
CssLayoutEngine.CreateLineBoxes(g, this); //This will automatically set the bottom of this block
}
else if (_boxes.Count > 0)
{
foreach (var childBox in Boxes)
{
childBox.PerformLayout(g);
}
ActualRight = CalculateActualRight();
ActualBottom = MarginBottomCollapse();
}
}
}
else
{
var prevSibling = DomUtils.GetPreviousSibling(this);
if (prevSibling != null)
{
if (Location == RPoint.Empty)
Location = prevSibling.Location;
ActualBottom = prevSibling.ActualBottom;
}
}
ActualBottom = Math.Max(ActualBottom, Location.Y + ActualHeight);
CreateListItemBox(g);
var actualWidth = Math.Max(GetMinimumWidth() + GetWidthMarginDeep(this), Size.Width < 90999 ? ActualRight - HtmlContainer.Root.Location.X : 0);
HtmlContainer.ActualSize = CommonUtils.Max(HtmlContainer.ActualSize, new RSize(actualWidth, ActualBottom - HtmlContainer.Root.Location.Y));
}
/// <summary>
/// Draw video image over the iframe if found.
/// </summary>
private void DrawImage(RGraphics g, RPoint offset, RRect rect)
{
if (_imageWord.Image != null)
{
if (rect.Width > 0 && rect.Height > 0)
{
if (_imageWord.ImageRectangle == RRect.Empty)
g.DrawImage(_imageWord.Image, rect);
else
g.DrawImage(_imageWord.Image, rect, _imageWord.ImageRectangle);
if (_imageWord.Selected)
{
g.DrawRectangle(GetSelectionBackBrush(g, true), _imageWord.Left + offset.X, _imageWord.Top + offset.Y, _imageWord.Width + 2, DomUtils.GetCssLineBoxByWord(_imageWord).LineHeight);
}
}
}
else if (_isVideo && !_imageLoadingComplete)
{
RenderUtils.DrawImageLoadingIcon(g, HtmlContainer, rect);
if (rect.Width > 19 && rect.Height > 19)
{
g.DrawRectangle(g.GetPen(RColor.LightGray), rect.X, rect.Y, rect.Width, rect.Height);
}
}
}
/// <summary>
/// Creates the <see cref="_listItemBox"/>
/// </summary>
/// <param name="g"></param>
private void CreateListItemBox(RGraphics g)
{
if (Display == CssConstants.ListItem && ListStyleType != CssConstants.None)
{
if (_listItemBox == null)
{
_listItemBox = new CssBox(null, null);
_listItemBox.InheritStyle(this);
_listItemBox.Display = CssConstants.Inline;
_listItemBox.HtmlContainer = HtmlContainer;
if (ListStyleType.Equals(CssConstants.Disc, StringComparison.InvariantCultureIgnoreCase))
{
_listItemBox.Text = new SubString("•");
}
else if (ListStyleType.Equals(CssConstants.Circle, StringComparison.InvariantCultureIgnoreCase))
{
_listItemBox.Text = new SubString("o");
}
else if (ListStyleType.Equals(CssConstants.Square, StringComparison.InvariantCultureIgnoreCase))
{
_listItemBox.Text = new SubString("♠");
}
else if (ListStyleType.Equals(CssConstants.Decimal, StringComparison.InvariantCultureIgnoreCase))
{
_listItemBox.Text = new SubString(GetIndexForList().ToString(CultureInfo.InvariantCulture) + ".");
}
else if (ListStyleType.Equals(CssConstants.DecimalLeadingZero, StringComparison.InvariantCultureIgnoreCase))
{
_listItemBox.Text = new SubString(GetIndexForList().ToString("00", CultureInfo.InvariantCulture) + ".");
}
else
{
_listItemBox.Text = new SubString(CommonUtils.ConvertToAlphaNumber(GetIndexForList(), ListStyleType) + ".");
}
_listItemBox.ParseToWords();
_listItemBox.PerformLayoutImp(g);
_listItemBox.Size = new RSize(_listItemBox.Words[0].Width, _listItemBox.Words[0].Height);
}
_listItemBox.Words[0].Left = Location.X - _listItemBox.Size.Width - 5;
_listItemBox.Words[0].Top = Location.Y + ActualPaddingTop; // +FontAscent;
}
}
/// <summary>
/// Draw video title on top of the iframe if found.
/// </summary>
private void DrawTitle(RGraphics g, RRect rect)
{
if (_videoTitle != null && _imageWord.Width > 40 && _imageWord.Height > 40)
{
var font = HtmlContainer.Adapter.GetFont("Arial", 9f, RFontStyle.Regular);
g.DrawRectangle(g.GetSolidBrush(RColor.FromArgb(160, 0, 0, 0)), rect.Left, rect.Top, rect.Width, ActualFont.Height + 7);
var titleRect = new RRect(rect.Left + 3, rect.Top + 3, rect.Width - 6, rect.Height - 6);
g.DrawString(_videoTitle, font, RColor.WhiteSmoke, titleRect.Location, RSize.Empty, false);
}
}
/// <summary>
/// Paint all the words in the box.
/// </summary>
/// <param name="g">the device to draw into</param>
/// <param name="offset">the current scroll offset to offset the words</param>
private void PaintWords(RGraphics g, RPoint offset)
{
if (Width.Length > 0)
{
var isRtl = Direction == CssConstants.Rtl;
foreach (var word in Words)
{
if (!word.IsLineBreak)
{
var wordPoint = new RPoint(word.Left + offset.X, word.Top + offset.Y);
if (word.Selected)
{
// handle paint selected word background and with partial word selection
var wordLine = DomUtils.GetCssLineBoxByWord(word);
var left = word.SelectedStartOffset > -1 ? word.SelectedStartOffset : (wordLine.Words[0] != word && word.HasSpaceBefore ? -ActualWordSpacing : 0);
var padWordRight = word.HasSpaceAfter && !wordLine.IsLastSelectedWord(word);
var width = word.SelectedEndOffset > -1 ? word.SelectedEndOffset : word.Width + (padWordRight ? ActualWordSpacing : 0);
var rect = new RRect(word.Left + offset.X + left, word.Top + offset.Y, width - left, wordLine.LineHeight);
g.DrawRectangle(GetSelectionBackBrush(g, false), rect.X, rect.Y, rect.Width, rect.Height);
if (HtmlContainer.SelectionForeColor != RColor.Empty && (word.SelectedStartOffset > 0 || word.SelectedEndIndexOffset > -1))
{
g.PushClipExclude(rect);
g.DrawString(word.Text, ActualFont, ActualColor, wordPoint, new RSize(word.Width, word.Height), isRtl);
g.PopClip();
g.PushClip(rect);
g.DrawString(word.Text, ActualFont, GetSelectionForeBrush(), wordPoint, new RSize(word.Width, word.Height), isRtl);
g.PopClip();
}
else
{
g.DrawString(word.Text, ActualFont, GetSelectionForeBrush(), wordPoint, new RSize(word.Width, word.Height), isRtl);
}
}
else
{
// g.DrawRectangle(HtmlContainer.Adapter.GetPen(RColor.Black), wordPoint.X, wordPoint.Y, word.Width - 1, word.Height - 1);
g.DrawString(word.Text, ActualFont, ActualColor, wordPoint, new RSize(word.Width, word.Height), isRtl);
}
}
}
}
}
/// <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>
/// Paints the fragment
/// </summary>
/// <param name="g">Device context to use</param>
public void Paint(RGraphics g)
{
try
{
if (Display != CssConstants.None && Visibility == CssConstants.Visible)
{
// don't call paint if the rectangle of the box is not in visible rectangle
bool visible = Rectangles.Count == 0;
if (!visible)
{
var clip = g.GetClip();
var rect = ContainingBlock.ClientRectangle;
rect.X -= 2;
rect.Width += 2;
rect.Offset(new RPoint(-HtmlContainer.Location.X, -HtmlContainer.Location.Y));
rect.Offset(HtmlContainer.ScrollOffset);
clip.Intersect(rect);
if (clip != RRect.Empty)
visible = true;
}
if (visible)
PaintImp(g);
}
}
catch (Exception ex)
{
HtmlContainer.ReportError(HtmlRenderErrorType.Paint, "Exception in box paint", ex);
}
}
/// <summary>
/// Layout the cells by the calculated table layout
/// </summary>
/// <param name="g"></param>
private void LayoutCells(RGraphics g)
{
double startx = Math.Max(_tableBox.ClientLeft + GetHorizontalSpacing(), 0);
double starty = Math.Max(_tableBox.ClientTop + GetVerticalSpacing(), 0);
double cury = starty;
double maxRight = startx;
double maxBottom = 0f;
int currentrow = 0;
for (int i = 0; i < _allRows.Count; i++)
{
var row = _allRows[i];
double curx = startx;
int curCol = 0;
for (int j = 0; j < row.Boxes.Count; j++)
{
CssBox cell = row.Boxes[j];
if (curCol >= _columnWidths.Length)
break;
int rowspan = GetRowSpan(cell);
var columnIndex = GetCellRealColumnIndex(row, cell);
double width = GetCellWidth(columnIndex, cell);
cell.Location = new RPoint(curx, cury);
cell.Size = new RSize(width, 0f);
cell.PerformLayout(g); //That will automatically set the bottom of the cell
//Alter max bottom only if row is cell's row + cell's rowspan - 1
CssSpacingBox sb = cell as CssSpacingBox;
if (sb != null)
{
if (sb.EndRow == currentrow)
{
maxBottom = Math.Max(maxBottom, sb.ExtendedBox.ActualBottom);
}
}
else if (rowspan == 1)
{
maxBottom = Math.Max(maxBottom, cell.ActualBottom);
}
maxRight = Math.Max(maxRight, cell.ActualRight);
curCol++;
curx = cell.ActualRight + GetHorizontalSpacing();
}
foreach (CssBox cell in row.Boxes)
{
CssSpacingBox spacer = cell as CssSpacingBox;
if (spacer == null && GetRowSpan(cell) == 1)
{
cell.ActualBottom = maxBottom;
CssLayoutEngine.ApplyCellVerticalAlignment(g, cell);
}
else if (spacer != null && spacer.EndRow == currentrow)
{
spacer.ExtendedBox.ActualBottom = maxBottom;
CssLayoutEngine.ApplyCellVerticalAlignment(g, spacer.ExtendedBox);
}
}
cury = maxBottom + GetVerticalSpacing();
currentrow++;
}
maxRight = Math.Max(maxRight, _tableBox.Location.X + _tableBox.ActualWidth);
_tableBox.ActualRight = maxRight + GetHorizontalSpacing() + _tableBox.ActualBorderRightWidth;
_tableBox.ActualBottom = Math.Max(maxBottom, starty) + GetVerticalSpacing() + _tableBox.ActualBorderBottomWidth;
}
/// <summary>
/// Measures the bounds of box and children, recursively.<br/>
/// Performs layout of the DOM structure creating lines by set bounds restrictions.
/// </summary>
/// <param name="g">Device context to use</param>
public void PerformLayout(RGraphics g)
{
try
{
PerformLayoutImp(g);
}
catch (Exception ex)
{
HtmlContainer.ReportError(HtmlRenderErrorType.Layout, "Exception in box layout", ex);
}
}
