//=========================================================================================
internal TextPoint GetSelectionBoundary(bool first)
{
var startPoint = Body.SelectionStart;
var caretPos = Caret.Point;
if (first)
{
return(TextPoint.Min(startPoint, caretPos));
}
else
{
return(TextPoint.Max(startPoint, caretPos));
}
}
//=========================================================================================
/// <summary>Draw selected text.</summary>
internal void DrawLinesWithSelection(Point offset, Graphics g)
{
//Find start and end of selection
TextPoint oFirst, oSecond;
if (this.Body.Caret.Point < this.Body.SelectionStart)
{
oFirst = this.Body.Caret.Point;
oSecond = this.Body.SelectionStart;
}
else
{
oFirst = this.Body.SelectionStart;
oSecond = this.Body.Caret.Point;
}
const int I_BEFORE_SELECTION = 0;
const int I_UNDER_SELECTION = 1;
const int I_AFTER_SELECTION = 2;
int iState;
{
//Determine position type of the first token
var oToken = this.Viewer.Tokens[this.Body.FirstVisibleToken];
if (oToken.Start <= oFirst)
{
iState = I_BEFORE_SELECTION;
}
else if (oToken.Start >= oSecond)
{
iState = I_AFTER_SELECTION;
}
else
{
iState = I_UNDER_SELECTION;
}
}
for (int i = this.Body.FirstVisibleToken; i <= this.Body.LastVisibleToken; i++)
{
var oToken = this.Viewer.Tokens[i];
Point point = this.Body.GetXYByTextPoint(oToken.Start);
point.Offset(offset);
switch (iState)
{
case I_BEFORE_SELECTION:
if (oToken.End <= oFirst)
{
this.DrawText(g, oToken.Text, oToken.Start.Col, point, oToken.Style.ForeColor);
}
else
{
TextPoint oTextSelectionStart;
if (oToken.Start < oFirst)
{
//Unselected part of first token
string sText = this.Viewer.Document.GetText(oToken.Start, oFirst);
this.DrawText(g, sText, oToken.Start.Col, point, oToken.Style.ForeColor);
oTextSelectionStart = oFirst;
}
else
{
oTextSelectionStart = oToken.Start;
}
{
//Selected part of the token
string sText = this.Viewer.Document.GetText(oTextSelectionStart, TextPoint.Min(oToken.End, oSecond));
Point p = this.Body.GetXYByTextPoint(oTextSelectionStart);
p.Offset(offset);
this.DrawText(g, sText, oTextSelectionStart.Col, p, SystemColors.HighlightText);
}
if (oSecond < oToken.End)
{
//If there is unselected end of the token
string sText = this.Viewer.Document.GetText(oSecond, oToken.End);
Point p = this.Body.GetXYByTextPoint(oSecond);
p.Offset(offset);
this.DrawText(g, sText, oSecond.Col, p, oToken.Style.ForeColor);
}
iState = I_UNDER_SELECTION;
}
break;
case I_UNDER_SELECTION:
if (oToken.End <= oSecond)
{
this.DrawText(g, oToken.Text, oToken.Start.Col, point, SystemColors.HighlightText);
}
else
{
iState = I_AFTER_SELECTION;
if (oToken.Start >= oSecond)
{
this.DrawText(g, oToken.Text, oToken.Start.Col, point, oToken.Style.ForeColor);
}
else
{
{
//draw selected part of the token
string sText = this.Viewer.Document.GetText(oToken.Start, TextPoint.Min(oToken.End, oSecond));
Point p = this.Body.GetXYByTextPoint(oToken.Start);
p.Offset(offset);
this.DrawText(g, sText, oToken.Start.Col, p, SystemColors.HighlightText);
}
{
//draw token part after selection
string sText = this.Viewer.Document.GetText(oSecond, oToken.End);
Point p = this.Body.GetXYByTextPoint(oSecond);
p.Offset(offset);
this.DrawText(g, sText, oSecond.Col, p, oToken.Style.ForeColor);
}
}
}
break;
case I_AFTER_SELECTION:
this.DrawText(g, oToken.Text, oToken.Start.Col, point, oToken.Style.ForeColor);
break;
}
}
}