/// <summary>
/// Get css word box under the given sub-tree at the given x,y location.<br/>
/// the location must be in correct scroll offset.
/// </summary>
/// <param name="lineBox">the line box to search in</param>
/// <param name="location">the location to find the box at</param>
/// <returns>css word box if exists or null</returns>
public static CssRect GetCssBoxWord(CssLineBox lineBox, RPoint location)
{
foreach (var rects in lineBox.Rectangles)
{
foreach (var word in rects.Key.Words)
{
// add word spacing to word width so sentence won't have hols in it when moving the mouse
var rect = word.Rectangle;
rect.Width += word.OwnerBox.ActualWordSpacing;
if (rect.Contains(location))
{
return(word);
}
}
}
return(null);
}
public void PaintSelection(PaintVisitor p, CssLineBox line)
{
if (this.Kind == SelectionSegmentKind.FullLine)
{
p.FillRectangle(p.CssBoxSelectionColor, //should be configurable
0,
0,
line.CachedLineContentWidth,
line.CacheLineHeight);
}
else
{
p.FillRectangle(
p.CssBoxSelectionColor,
this.BeginAtPx, 0,
this.WidthPx,
(int)line.CacheLineHeight);
}
}
internal static float CalculateInnerContentHeight(this CssBox startBox)
{
//calculate inner content height
if (startBox.LineBoxCount > 0)
{
CssLineBox lastLine = startBox.GetLastLineBox();
return(lastLine.CachedLineBottom);
}
else
{
float maxBottom = 0;
foreach (CssBox childBox in startBox.GetChildBoxIter())
{
float top = childBox.LocalY;
float contentH = CalculateInnerContentHeight(childBox);
if ((top + contentH) > maxBottom)
{
maxBottom = top + contentH;
}
}
return(maxBottom);
}
}
/// <summary>
/// Get css line box under the given sub-tree at the given y location or the nearest line from the top.<br/>
/// the location must be in correct scroll offset.
/// </summary>
/// <param name="box">the box to start search from</param>
/// <param name="location">the location to find the box at</param>
/// <returns>css word box if exists or null</returns>
public static CssLineBox GetCssLineBox(CssBox box, RPoint location)
{
CssLineBox line = null;
if (box != null)
{
if (box.LineBoxes.Count > 0)
{
if (box.HtmlTag == null || box.HtmlTag.Name != "td" || box.Bounds.Contains(location))
{
foreach (var lineBox in box.LineBoxes)
{
foreach (var rect in lineBox.Rectangles)
{
if (rect.Value.Top <= location.Y)
{
line = lineBox;
}
if (rect.Value.Top > location.Y)
{
return(line);
}
}
}
}
}
foreach (var childBox in box.Boxes)
{
line = GetCssLineBox(childBox, location) ?? line;
}
}
return(line);
}
/// <summary>
/// Handle html text selection by mouse move over the html with left mouse button pressed.<br/>
/// Calculate the words in the selected range and set their selected property.
/// </summary>
/// <param name="control">the control hosting the html to invalidate</param>
/// <param name="loc">the mouse location</param>
/// <param name="allowPartialSelect">true - partial word selection allowed, false - only full words selection</param>
private void HandleSelection(Control control, Point loc, bool allowPartialSelect)
{
// get the line under the mouse or nearest from the top
CssLineBox lineBox = DomUtils.GetCssLineBox(_root, loc);
if (lineBox != null)
{
// get the word under the mouse
CssRect word = DomUtils.GetCssBoxWord(lineBox, loc);
// if no word found under the mouse use the last or the first word in the line
if (word == null && lineBox.Words.Count > 0)
{
if (loc.Y > lineBox.LineBottom)
{
// under the line
word = lineBox.Words[lineBox.Words.Count - 1];
}
else if (loc.X < lineBox.Words[0].Left)
{
// before the line
word = lineBox.Words[0];
}
else if (loc.X > lineBox.Words[lineBox.Words.Count - 1].Right)
{
// at the end of the line
word = lineBox.Words[lineBox.Words.Count - 1];
}
}
// if there is matching word
if (word != null)
{
if (_selectionStart == null)
{
// on start set the selection start word
_selectionStartPoint = loc;
_selectionStart = word;
if (allowPartialSelect)
{
CalculateWordCharIndexAndOffset(control, word, loc, true);
}
}
// always set selection end word
_selectionEnd = word;
if (allowPartialSelect)
{
CalculateWordCharIndexAndOffset(control, word, loc, false);
}
ClearSelection(_root);
if (CheckNonEmptySelection(loc, allowPartialSelect))
{
CheckSelectionDirection();
SelectWordsInRange(_root, _backwardSelection ? _selectionEnd : _selectionStart,
_backwardSelection ? _selectionStart : _selectionEnd);
}
else
{
_selectionEnd = null;
}
_cursorChanged = true;
control.Cursor = Cursors.IBeam;
control.Invalidate();
}
}
}
