public override void DrawTextLayout(object backend, TextLayout layout, double x, double y)
{
Pango.Layout pl = (Pango.Layout)WidgetRegistry.GetBackend (layout);
CairoContextBackend ctx = (CairoContextBackend)backend;
ctx.Context.MoveTo (x, y);
if (layout.Height <= 0) {
Pango.CairoHelper.ShowLayout (ctx.Context, pl);
} else {
var lc = pl.LineCount;
var scale = Pango.Scale.PangoScale;
double h = 0;
for (int i=0; i<lc; i++) {
var line = pl.Lines [i];
var ext = new Pango.Rectangle ();
var extl = new Pango.Rectangle ();
line.GetExtents (ref ext, ref extl);
h += (extl.Height / scale);
if (h > layout.Height)
break;
ctx.Context.MoveTo (x, y + h);
Pango.CairoHelper.ShowLayoutLine (ctx.Context, line);
}
}
}
public override void DrawTextLayout(object backend, TextLayout layout, double x, double y)
{
var be = (GtkTextLayoutBackendHandler.PangoBackend)Toolkit.GetBackend (layout);
var pl = be.Layout;
CairoContextBackend ctx = (CairoContextBackend)backend;
ctx.Context.MoveTo (x, y);
if (layout.Height <= 0) {
Pango.CairoHelper.ShowLayout (ctx.Context, pl);
} else {
var lc = pl.LineCount;
var scale = Pango.Scale.PangoScale;
double h = 0;
var fe = ctx.Context.FontExtents;
var baseline = fe.Ascent / (fe.Ascent + fe.Descent);
for (int i=0; i<lc; i++) {
var line = pl.Lines [i];
var ext = new Pango.Rectangle ();
var extl = new Pango.Rectangle ();
line.GetExtents (ref ext, ref extl);
h += h == 0 ? (extl.Height / scale * baseline) : (extl.Height / scale);
if (h > layout.Height)
break;
ctx.Context.MoveTo (x, y + h);
Pango.CairoHelper.ShowLayoutLine (ctx.Context, line);
}
}
}
public static Rectangle DrawTextBlock(this Context g, TextBlock tb, bool render)
{
double topBottomSpan = tb.Padding.Top + tb.Padding.Bottom;
double leftRightSpan = tb.Padding.Left + tb.Padding.Right;
double vertAlgSpan = 0;
g.Save ();
Pango.Layout layout = createLayoutFromTextBlock(g,tb);
g.Color = tb.FontColor.ToCairoColor();
Pango.Rectangle inkRect1;
Pango.Rectangle logicalRect;
layout.GetExtents (out inkRect1, out logicalRect);
double measuredHeight = (logicalRect.Height) / (Pango.Scale.PangoScale * UnitMultiplier);
double measuredY = logicalRect.Y / (Pango.Scale.PangoScale * UnitMultiplier);
if(tb.VerticalAlignment != VerticalAlignment.Top)
vertAlgSpan = measureVerticlaSpan(tb,measuredHeight);
g.MoveTo ((tb.Left + tb.Padding.Left) * UnitMultiplier, (tb.Top + tb.Padding.Top + vertAlgSpan - measuredY) * UnitMultiplier);
if (render) {
Pango.CairoHelper.ShowLayout(g, layout);
}
layout.GetExtents (out inkRect1, out logicalRect);
measuredHeight = (logicalRect.Height) / (Pango.Scale.PangoScale * UnitMultiplier);
double measuredWidth = logicalRect.Width / (Pango.Scale.PangoScale * UnitMultiplier);
measuredY = logicalRect.Y / (Pango.Scale.PangoScale * UnitMultiplier);
if ( DebugTextBlock && render ) {
Pango.Rectangle inklineRect = new Pango.Rectangle();
Pango.Rectangle logLineRect = new Pango.Rectangle();
{
double span = measuredY;
for(int d = 0 ; d < layout.LinesReadOnly.Length;d++){
var item = layout.LinesReadOnly[d];
item.GetExtents(ref inklineRect,ref logLineRect);
//seems like when measuring line logLineRect.Y is not needed but i don't know why
double h = ((logLineRect.Height / Pango.Scale.PangoScale));
double x = ((tb.Left + tb.Padding.Left) * UnitMultiplier + (logLineRect.X / Pango.Scale.PangoScale));
double y = (tb.Top + tb.Padding.Top) * UnitMultiplier + span;
DrawDebugRect(g,
new Cairo.Rectangle(
x, y,
((logLineRect.Width / Pango.Scale.PangoScale)) ,
h
));
span += h;
}
}
}
(layout as IDisposable).Dispose();
g.Restore ();
return new Rectangle( tb.Left , tb.Top, measuredWidth + leftRightSpan , measuredHeight + topBottomSpan);
}
public void GetExtents (out Pango.Rectangle ink_rect, out Pango.Rectangle logical_rect)
{
if (this.width >= 0) {
ink_rect = logical_rect = new Pango.Rectangle {
X = 0,
Y = 0,
Width = width,
Height = height
};
return;
}
layout.GetExtents (out ink_rect, out logical_rect);
}
