/// <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;
}
else
{
var cBlock = containingBlock.ContainingBlock;
if (cBlock == containingBlock)
return false;
containingBlock = cBlock;
}
}
}
/// <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>
/// 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);
}
}
}
}
}
