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what's the equivalent of UpdateSourceTrigger?
better question, how do I know when something changed from the ui thread, like IsPointerOver for example
you can use styles and pseudoclasses like :pointerover for things like this. See http://avaloniaui.net/docs/styles/styles
hi everyone! started to experiment with Avalonia once again
I was missing horizontal letter spacing feature to get nice fonts
so I've added following to forked d2d:
var layout = TextLayout.QueryInterface<DWrite.TextLayout1>();
layout.SetCharacterSpacing((float)(2*typeface.HorizontalSpacing - 2), 0, 0, new DWrite.TextRange(0, Text.Length));
as far as I found there is no direct alternative of that in skia
any plans on making custom text renderers?
I've looked into this, but it is different stuff
it is focused on line-height only
There is no built-in layout engine in Skia
yes, I know
i mean go deeper and position glyphs manually
you can do that in skia using SKCanvas.DrawPositionedText
there was talk of implementing wpf GlyphRun which I think allows this
skia doesn't have glyphrun
so basically i'm able to set letter spacing using TextLayout1 in SharpDX
it works
but it doesn't in skia
textlayout1 doesn't work in W7 without SP1, but who cares
35% of windows users :)
sorry forgot the sp1
We require platform update anyway
this one
so i'm confused is there any value in exploiting platform typesetting features
instead of reimplementing them in managed code
if skia is so limited
@Gillibald mentioned GlyphRun was on his todo list for skia
there is no glyphrun in skiasharp afaik
you can do DrawPositionedText but it is not glyphrun
technically you can draw FormattedText many times which is almost same, but slower
no idea what his plan was but maybe that was it
positioning each letter separately... skia doesn't provide raw font data
ForNeVeR/wpf-math#170 effectively does just that with external font info, this is ported from wpf but it did the same there, I'm intrigued to see if it can be done in a simpler way
oh wow
some really exciting stuff there
any screenshots how it looks in Avalonia?
Vertical and horizontal spacing will be no issue to implement
how would you implement horizontal spacing?
Just override the fonts default line spacing. Either by a factor or a fixed value.
what do you mean on line spacing here? i speak about letter spacing
does it use ttf computer modern?
nothing clever by me here btw, I just polished a port.
Just leave a comment in that PR to request features
ah, ok
so then you use drawpositiontedtext?
Yes. This will change when TextBlob is introduced
Well, then it makes sense to agree which units should horizontal spacing should be
I tend to 1 = 100%, 0 = 0% (all letters close to each other without spacing)
There is still some work to do in the text layout PR. When that is ready for testing I will work on features like TextDecorations, Glyphs(GlyphRun) etc.
@ahopper the problem with :pointerover in styles is I don't see how I can run C# code in my class when the IsPointerOver value changes