/// <summary>
/// Returns a rectangle based on the given IDisplayPointer
/// </summary>
/// <param name="element">The element that contains the display pointer</param>
/// <param name="displayPointer"></param>
/// <returns></returns>
protected Rectangle GetLineRect(IHTMLElement element, IDisplayPointerRaw displayPointer)
{
ILineInfo lineInfo;
displayPointer.GetLineInfo(out lineInfo);
Rectangle elementRect = HTMLElementHelper.GetClientRectangle(element);
//determine the rectangle based on the baseline and text height.
//Note: baseline is relative to the parent element, and the text
//height includes the textDescent, which is below the baseline
int lineBottom = elementRect.Y + lineInfo.baseLine + lineInfo.textDescent;
int lineTop = lineBottom - lineInfo.textHeight;
int lineLeft = elementRect.X;
int lineWidth = elementRect.Width;
//Calculate the height of line. Since the bottom pixel line is shared by the next line,
//we subtract 1 from the height. This height exactly matches height of the caret.
//Note: this height adjustment fixes a bug that can occur with some text styles where a
//caret placed on the next line is detected as being within this rectangle.
int lineHeight = lineInfo.textHeight - 1;
//create a rectangle that exactly fits the caret for this line
//Note: this can be verified by painting a rectangle over the line using this rectangle
return(new Rectangle(lineLeft, lineTop, lineWidth, lineHeight));
}
/// <summary>
/// Returns the bounds of the element in client-based coordinatates.
/// Note: These bounds seem to map to the outer edge of the element's border region.
/// </summary>
/// <returns></returns>
protected Rectangle GetClientRectangle()
{
return(HTMLElementHelper.GetClientRectangle(HTMLElement));
}
