/// <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;
if (!box.IsFixed)
rect.Offset(box.HtmlContainer.ScrollOffset);
rect.Intersect(prevClip);
g.PushClip(rect);
return true;
}
else
{
var cBlock = containingBlock.ContainingBlock;
if (cBlock == containingBlock)
return false;
containingBlock = cBlock;
}
}
}
/// <summary>
/// Measure the size of the html by performing layout under the given restrictions.
/// </summary>
/// <param name="g">the graphics to use</param>
/// <param name="htmlContainer">the html to calculate the layout for</param>
/// <param name="minSize">the minimal size of the rendered html (zero - not limit the width/height)</param>
/// <param name="maxSize">the maximum size of the rendered html, if not zero and html cannot be layout within the limit it will be clipped (zero - not limit the width/height)</param>
/// <returns>return: the size of the html to be rendered within the min/max limits</returns>
public static RSize MeasureHtmlByRestrictions(RGraphics g, HtmlContainerInt htmlContainer, RSize minSize, RSize maxSize)
{
// first layout without size restriction to know html actual size
htmlContainer.PerformLayout(g);
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 = new RSize(maxSize.Width, 0);
htmlContainer.PerformLayout(g);
}
// restrict the final size by min/max
var finalWidth = Math.Max(maxSize.Width > 0 ? Math.Min(maxSize.Width, (int)htmlContainer.ActualSize.Width) : (int)htmlContainer.ActualSize.Width, minSize.Width);
// if the final width is larger than the actual we need to re-layout so the html can take the full given width.
if (finalWidth > htmlContainer.ActualSize.Width)
{
htmlContainer.MaxSize = new RSize(finalWidth, 0);
htmlContainer.PerformLayout(g);
}
var finalHeight = Math.Max(maxSize.Height > 0 ? Math.Min(maxSize.Height, (int)htmlContainer.ActualSize.Height) : (int)htmlContainer.ActualSize.Height, minSize.Height);
return new RSize(finalWidth, finalHeight);
}
/// <summary>
/// Paints the fragment
/// </summary>
/// <param name="g">the device to draw to</param>
protected override void PaintImp(RGraphics g)
{
// load image iff it is in visible rectangle
if (_imageLoadHandler == null)
{
_imageLoadHandler = new ImageLoadHandler(HtmlContainer, OnLoadImageComplete);
_imageLoadHandler.LoadImage(GetAttribute("src"), HtmlTag != null ? HtmlTag.Attributes : null);
}
var rect = CommonUtils.GetFirstValueOrDefault(Rectangles);
RPoint offset = HtmlContainer.ScrollOffset;
rect.Offset(offset);
var clipped = RenderUtils.ClipGraphicsByOverflow(g, this);
PaintBackground(g, rect, true, true);
BordersDrawHandler.DrawBoxBorders(g, this, rect, true, true);
RRect r = _imageWord.Rectangle;
r.Offset(offset);
r.Height -= ActualBorderTopWidth + ActualBorderBottomWidth + ActualPaddingTop + ActualPaddingBottom;
r.Y += ActualBorderTopWidth + ActualPaddingTop;
r.X = Math.Floor(r.X);
r.Y = Math.Floor(r.Y);
if (_imageWord.Image != null)
{
if (r.Width > 0 && r.Height > 0)
{
if (_imageWord.ImageRectangle == RRect.Empty)
g.DrawImage(_imageWord.Image, r);
else
g.DrawImage(_imageWord.Image, r, _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 (_imageLoadingComplete)
{
if (_imageLoadingComplete && r.Width > 19 && r.Height > 19)
{
RenderUtils.DrawImageErrorIcon(g, HtmlContainer, r);
}
}
else
{
RenderUtils.DrawImageLoadingIcon(g, HtmlContainer, r);
if (r.Width > 19 && r.Height > 19)
{
g.DrawRectangle(g.GetPen(RColor.LightGray), r.X, r.Y, r.Width, r.Height);
}
}
if (clipped)
g.PopClip();
}
public override double GetWhitespaceWidth(RGraphics graphics)
{
if (_whitespaceWidth < 0)
{
_whitespaceWidth = graphics.MeasureString(" ", this).Width;
}
return _whitespaceWidth;
}
/// <summary>
/// Gets the white space width of the specified box
/// </summary>
/// <param name="g"></param>
/// <param name="box"></param>
/// <returns></returns>
public static double WhiteSpace(RGraphics g, CssBoxProperties box)
{
double w = box.ActualFont.GetWhitespaceWidth(g);
if (!(String.IsNullOrEmpty(box.WordSpacing) || box.WordSpacing == CssConstants.Normal))
{
w += CssValueParser.ParseLength(box.WordSpacing, 0, box, true);
}
return w;
}
/// <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>
protected override void PerformLayoutImp(RGraphics g)
{
if (Display == CssConstants.None)
return;
RectanglesReset();
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;
//width at 100% (or auto)
double minwidth = GetMinimumWidth();
double width = ContainingBlock.Size.Width
- ContainingBlock.ActualPaddingLeft - ContainingBlock.ActualPaddingRight
- ContainingBlock.ActualBorderLeftWidth - ContainingBlock.ActualBorderRightWidth
- ActualMarginLeft - ActualMarginRight - ActualBorderLeftWidth - ActualBorderRightWidth;
//Check width if not auto
if (Width != CssConstants.Auto && !string.IsNullOrEmpty(Width))
{
width = CssValueParser.ParseLength(Width, width, this);
}
if (width < minwidth || width >= 9999)
width = minwidth;
double height = ActualHeight;
if (height < 1)
{
height = Size.Height + ActualBorderTopWidth + ActualBorderBottomWidth;
}
if (height < 1)
{
height = 2;
}
if (height <= 2 && ActualBorderTopWidth < 1 && ActualBorderBottomWidth < 1)
{
BorderTopStyle = BorderBottomStyle = CssConstants.Solid;
BorderTopWidth = "1px";
BorderBottomWidth = "1px";
}
Size = new RSize(width, height);
ActualBottom = Location.Y + ActualPaddingTop + ActualPaddingBottom + 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>
/// 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>
/// 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>
/// 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>
/// 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>
/// 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>
/// 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>
/// 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>
/// Draw the background image at the required location repeating it over the X and Y axis.<br/>
/// Adjust location to left-top if starting location doesn't include all the range (adjusted to center or bottom/right).
/// </summary>
private static void DrawRepeat(RGraphics g, ImageLoadHandler imageLoadHandler, RRect rectangle, RRect srcRect, RRect destRect, RSize imgSize)
{
while (destRect.X > rectangle.X)
destRect.X -= imgSize.Width;
while (destRect.Y > rectangle.Y)
destRect.Y -= imgSize.Height;
using (var brush = g.GetTextureBrush(imageLoadHandler.Image, srcRect, destRect.Location))
{
g.DrawRectangle(brush, rectangle.X, rectangle.Y, rectangle.Width, rectangle.Height);
}
}
/// <summary>
/// Render the html using the given device.
/// </summary>
/// <param name="g">the device to use to render</param>
public void PerformPaint(RGraphics g)
{
ArgChecker.AssertArgNotNull(g, "g");
if (MaxSize.Height > 0)
{
g.PushClip(new RRect(_location.X, _location.Y, Math.Min(_maxSize.Width, PageSize.Width), Math.Min(_maxSize.Height, PageSize.Height)));
}
else
{
g.PushClip(new RRect(MarginLeft, MarginTop, PageSize.Width, PageSize.Height));
}
if (_root != null)
{
_root.Paint(g);
}
g.PopClip();
}
/// <summary>
/// Creates a rounded rectangle using the specified corner radius<br/>
/// NW-----NE
/// | |
/// | |
/// SW-----SE
/// </summary>
/// <param name="g">the device to draw into</param>
/// <param name="rect">Rectangle to round</param>
/// <param name="nwRadius">Radius of the north east corner</param>
/// <param name="neRadius">Radius of the north west corner</param>
/// <param name="seRadius">Radius of the south east corner</param>
/// <param name="swRadius">Radius of the south west corner</param>
/// <returns>GraphicsPath with the lines of the rounded rectangle ready to be painted</returns>
public static RGraphicsPath GetRoundRect(RGraphics g, RRect rect, double nwRadius, double neRadius, double seRadius, double swRadius)
{
var path = g.GetGraphicsPath();
path.Start(rect.Left + nwRadius, rect.Top);
path.LineTo(rect.Right - neRadius, rect.Y);
if (neRadius > 0f)
path.ArcTo(rect.Right, rect.Top + neRadius, neRadius, RGraphicsPath.Corner.TopRight);
path.LineTo(rect.Right, rect.Bottom - seRadius);
if (seRadius > 0f)
path.ArcTo(rect.Right - seRadius, rect.Bottom, seRadius, RGraphicsPath.Corner.BottomRight);
path.LineTo(rect.Left + swRadius, rect.Bottom);
if (swRadius > 0f)
path.ArcTo(rect.Left, rect.Bottom - swRadius, swRadius, RGraphicsPath.Corner.BottomLeft);
path.LineTo(rect.Left, rect.Top + nwRadius);
if (nwRadius > 0f)
path.ArcTo(rect.Left + nwRadius, rect.Top, nwRadius, RGraphicsPath.Corner.TopLeft);
return path;
}
/// <summary>
/// Assigns words its width and height
/// </summary>
/// <param name="g">the device to use</param>
internal override void MeasureWordsSize(RGraphics g)
{
if (!_wordsSizeMeasured)
{
if (_imageLoadHandler == null && (HtmlContainer.AvoidAsyncImagesLoading || HtmlContainer.AvoidImagesLateLoading))
{
_imageLoadHandler = new ImageLoadHandler(HtmlContainer, OnLoadImageComplete);
if (this.Content != null && this.Content != CssConstants.Normal)
_imageLoadHandler.LoadImage(this.Content, HtmlTag != null ? HtmlTag.Attributes : null);
else
_imageLoadHandler.LoadImage(GetAttribute("src"), HtmlTag != null ? HtmlTag.Attributes : null);
}
MeasureWordSpacing(g);
_wordsSizeMeasured = true;
}
CssLayoutEngine.MeasureImageSize(_imageWord);
}
/// <summary>
/// Draw image failed to load icon.
/// </summary>
/// <param name="g">the device to draw into</param>
/// <param name="htmlContainer"></param>
/// <param name="r">the rectangle to draw icon in</param>
public static void DrawImageErrorIcon(RGraphics g, HtmlContainerInt htmlContainer, RRect r)
{
g.DrawRectangle(g.GetPen(RColor.LightGray), r.Left + 2, r.Top + 2, 15, 15);
var image = htmlContainer.Adapter.GetLoadingFailedImage();
g.DrawImage(image, new RRect(r.Left + 3, r.Top + 3, image.Width, image.Height));
}
/// <summary>
/// Paints the fragment
/// </summary>
/// <param name="g">the device to draw to</param>
protected override void PaintImp(RGraphics g)
{
if (_videoImageUrl != null && _imageLoadHandler == null)
{
_imageLoadHandler = new ImageLoadHandler(HtmlContainer, OnLoadImageComplete);
_imageLoadHandler.LoadImage(_videoImageUrl, HtmlTag != null ? HtmlTag.Attributes : null);
}
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();
}
/// <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>
/// 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>
/// 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>
/// 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);
}
}
/// <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>
/// 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));
else
return g.GetSolidBrush(backColor);
}
else
{
return g.GetSolidBrush(CssUtils.DefaultSelectionBackcolor);
}
}
/// <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>
/// 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>
/// Measures the bounds of box and children, recursively.
/// </summary>
/// <param name="g">Device context to draw</param>
public void PerformLayout(RGraphics g)
{
ArgChecker.AssertArgNotNull(g, "g");
_actualSize = RSize.Empty;
if (_root != null)
{
// if width is not restricted we set it to large value to get the actual later
_root.Size = new RSize(_maxSize.Width > 0 ? _maxSize.Width : 99999, 0);
_root.Location = _location;
_root.PerformLayout(g);
if (_maxSize.Width <= 0.1)
{
// in case the width is not restricted we need to double layout, first will find the width so second can layout by it (center alignment)
_root.Size = new RSize((int)Math.Ceiling(_actualSize.Width), 0);
_actualSize = RSize.Empty;
_root.PerformLayout(g);
}
if (!_loadComplete)
{
_loadComplete = true;
EventHandler handler = LoadComplete;
if (handler != null)
handler(this, EventArgs.Empty);
}
}
}
