public Builder(TextViewModel model, Graphics g, StyleStack styleStack, Font defaultFont)
{
this.model = model;
this.g = g;
this.styleStack = styleStack;
this.defaultFont = defaultFont;
this.visibleLines = new SortedList <float, LayoutLine>();
}
private StyleStack GetStyleStack()
{
if (styleStack == null)
{
styleStack = new StyleStack(Services.RequireService <IUiPreferencesService>());
}
return(styleStack);
}
public TextViewPainter(TextViewLayout outer, Graphics g, Color fgColor, Color bgColor, Font defaultFont, StyleStack styleStack)
{
this.outer = outer;
this.graphics = g;
this.defaultFgColor = fgColor;
this.defaultBgColor = bgColor;
this.defaultFont = defaultFont;
this.styleStack = styleStack;
this.useGdiPlus = false;
}
public RectangleF LogicalPositionToClient(Graphics g, TextPointer pos, StyleStack styleStack)
{
foreach (var line in this.visibleLines.Values)
{
if (line.Position == pos.Line)
{
return(SpanPositionToClient(g, pos, line, styleStack));
}
}
return(new RectangleF(new PointF(0, 0), CalculateExtent()));
}
public TextPointer ClientToLogicalPosition(Graphics g, Point pt, StyleStack styleStack)
{
foreach (var line in this.visibleLines.Values)
{
if (line.Extent.Top <= pt.Y && pt.Y < line.Extent.Bottom)
{
return(FindSpanPosition(g, pt, line, styleStack));
}
}
return(new TextPointer(model.EndPosition, 0, 0));
}
private int GetCharPosition(Graphics g, Point ptClient, LayoutSpan span, StyleStack styleStack)
{
var x = ptClient.X - span.ContentExtent.Left;
var textStub = span.Text;
int iLow = 0;
int iHigh = textStub.Length;
styleStack.PushStyle(span.Style);
var font = styleStack.GetFont(defaultFont);
var sz = MeasureText(g, textStub, font);
float xLow = 0;
float xHigh = sz.Width;
while (iLow < iHigh - 1)
{
int iMid = iLow + (iHigh - iLow) / 2;
textStub = span.Text.Substring(0, iMid);
sz = MeasureText(g, textStub, font);
if (x < sz.Width)
{
iHigh = iMid;
xHigh = sz.Width;
}
else
{
iLow = iMid;
xLow = sz.Width;
}
}
styleStack.PopStyle();
var cx = xHigh - xLow;
if (x - xLow > cx)
{
return(iHigh);
}
else
{
return(iLow);
}
}
public static TextViewLayout VisibleLines(TextViewModel model, Size size, Graphics g, Font defaultFont, StyleStack styleStack)
{
var szClient = new SizeF(size);
var rcLine = new RectangleF(0, 0, szClient.Width, 0);
var builder = new Builder(model, g, styleStack, defaultFont);
while (rcLine.Top < szClient.Height)
{
var lines = model.GetLineSpans(1);
if (lines.Length == 0)
{
break;
}
builder.AddLayoutLine(lines[0], ref rcLine);
}
return(builder.Build());
}
/// <summary>
/// Generates a TextViewLayout from all the lines in the model.
/// </summary>
/// <param name="model"></param>
/// <param name="g"></param>
/// <param name="defaultFont"></param>
/// <param name="styleStack"></param>
/// <returns></returns>
public static TextViewLayout AllLines(TextViewModel model, Graphics g, Font defaultFont, StyleStack styleStack)
{
model.MoveToLine(model.StartPosition, 0);
var rcLine = new RectangleF();
var builder = new Builder(model, g, styleStack, defaultFont);
for (;;)
{
var lines = model.GetLineSpans(1);
if (lines.Length == 0)
{
break;
}
builder.AddLayoutLine(lines[0], ref rcLine);
}
var layout = builder.Build();
return(layout);
}
private RectangleF CharPositionToClient(Graphics g, TextPointer pos, LayoutSpan span, StyleStack styleStack)
{
var iChar = pos.Character;
styleStack.PushStyle(span.Style);
var font = styleStack.GetFont(defaultFont);
var textStub = span.Text.Substring(0, iChar);
var sz = MeasureText(g, textStub, font);
var x = sz.Width + span.ContentExtent.Left;
var width = 1;
styleStack.PopStyle();
return(new RectangleF(x, span.ContentExtent.Top, width, span.ContentExtent.Height));
}
private RectangleF SpanPositionToClient(Graphics g, TextPointer pos, LayoutLine line, StyleStack styleStack)
{
var iSpan = pos.Span;
if (iSpan < 0 || iSpan >= line.Spans.Length)
{
return(line.Extent);
}
var span = line.Spans[iSpan];
return(CharPositionToClient(g, pos, span, styleStack));
}
private TextPointer FindSpanPosition(Graphics g, Point ptClient, LayoutLine line, StyleStack styleStack)
{
int iSpan = 0;
foreach (var span in line.Spans)
{
if (span.ContentExtent.Contains(ptClient))
{
int iChar = GetCharPosition(g, ptClient, span, styleStack);
return(new TextPointer(line.Position, iSpan, iChar));
}
++iSpan;
}
return(new TextPointer(line.Position, iSpan, 0));
}
