public override Size MeasureText(Font font, string text)
{
CTFont sysFont = font.RendererData as CTFont;
if (sysFont == null || Math.Abs(font.RealSize - font.Size * Scale) > 2)
{
FreeFont(font);
LoadFont(font);
sysFont = font.RendererData as CTFont;
}
var key = new Tuple <String, Font>(text, font);
if (m_StringCache.ContainsKey(key))
{
var tex = m_StringCache[key].Texture;
return(new Size(tex.Width, tex.Height));
}
text = text.Replace("\t", " ");
var attributedString = new NSAttributedString(text, new CTStringAttributes()
{
Font = sysFont, UnderlineStyle = font.Underline ? CTUnderlineStyle.Single : CTUnderlineStyle.None
});
CTLine ctLine = new CTLine(attributedString);
CGRect cgRect = ctLine.GetBounds(CTLineBoundsOptions.IncludeLanguageExtents | CTLineBoundsOptions.UseHangingPunctuation);
ctLine.Dispose();
attributedString.Dispose();
return(new Size(Util.Ceil((float)cgRect.Width), Util.Ceil((float)cgRect.Height)));
}
public override void RenderText(Font font, Point position, string text)
{
Flush();
CTFont sysFont = font.RendererData as CTFont;
if (sysFont == null || Math.Abs(font.RealSize - font.Size * Scale) > 2)
{
FreeFont(font);
LoadFont(font);
sysFont = font.RendererData as CTFont;
}
var key = new Tuple <String, Font>(text, font);
if (!m_StringCache.ContainsKey(key))
{
// not cached - create text renderer
text = text.Replace("\t", " ");
var attributedString = new NSAttributedString(text, new CTStringAttributes()
{
ForegroundColorFromContext = true, Font = sysFont, UnderlineStyle = font.Underline ? CTUnderlineStyle.Single : CTUnderlineStyle.None
});
CTLine ctLine = new CTLine(attributedString);
CGRect cgRect = ctLine.GetBounds(CTLineBoundsOptions.IncludeLanguageExtents | CTLineBoundsOptions.UseHangingPunctuation);
TextRenderer tr = new TextRenderer(Util.Ceil((float)cgRect.Width), Util.Ceil((float)cgRect.Height), this);
tr.DrawString(ctLine, new Point(0, (int)sysFont.DescentMetric)); // renders string on the texture
ctLine.Dispose();
attributedString.Dispose();
DrawTexturedRect(tr.Texture, new Rectangle(position.X, position.Y, tr.Texture.Width, tr.Texture.Height));
m_StringCache[key] = tr;
}
else
{
TextRenderer tr = m_StringCache[key];
DrawTexturedRect(tr.Texture, new Rectangle(position.X, position.Y, tr.Texture.Width, tr.Texture.Height));
}
}
public void DrawText(string text, float x, float y, float width, float height, Xamarin.Forms.TextAlignment hAlignment, Xamarin.Forms.TextAlignment vAlignment)
{
if (font == null || font.NativeFont == null)
{
return;
}
var attributedString = new NSAttributedString(text, new CTStringAttributes()
{
Font = font.NativeFont, ForegroundColorFromContext = true
});
CTLine ctLine = new CTLine(attributedString);
CGSize size = new CGSize((float)ctLine.GetTypographicBounds(), font.NativeFont.CapHeightMetric + font.NativeFont.DescentMetric);
if ((hAlignment & Xamarin.Forms.TextAlignment.Center) != 0)
{
x += (width - (float)size.Width) / 2;
}
else if ((hAlignment & Xamarin.Forms.TextAlignment.End) != 0)
{
x += width - (float)size.Width;
}
if ((vAlignment & Xamarin.Forms.TextAlignment.Center) != 0)
{
y += (height - (float)size.Height) / 2;
}
else if ((vAlignment & Xamarin.Forms.TextAlignment.End) != 0)
{
y += height - (float)size.Height;
}
context.SaveState();
context.ScaleCTM(1f, -1f);
context.TextPosition = new CGPoint(x, -y - font.NativeFont.CapHeightMetric);
ctLine.Draw(context);
context.RestoreState();
ctLine.Dispose();
attributedString.Dispose();
}
public Xamarin.Forms.Size MeasureText(string text)
{
if (font == null || font.NativeFont == null)
{
return(Xamarin.Forms.Size.Zero);
}
var attributedString = new NSAttributedString(text, new CTStringAttributes()
{
Font = font.NativeFont, ForegroundColorFromContext = true
});
CTLine ctLine = new CTLine(attributedString);
Xamarin.Forms.Size size = new Xamarin.Forms.Size((float)ctLine.GetTypographicBounds(), font.NativeFont.CapHeightMetric + font.NativeFont.DescentMetric);
ctLine.Dispose();
attributedString.Dispose();
return(size);
}
public void DrawText(string text, float x, float y)
{
if (font == null || font.NativeFont == null)
{
return;
}
var attributedString = new NSAttributedString(text, new CTStringAttributes()
{
Font = font.NativeFont, ForegroundColorFromContext = true
});
CTLine ctLine = new CTLine(attributedString);
context.SaveState();
context.ScaleCTM(1f, -1f);
context.TextPosition = new CGPoint(x, -y - font.NativeFont.CapHeightMetric);
ctLine.Draw(context);
context.RestoreState();
ctLine.Dispose();
attributedString.Dispose();
}
