GI.Cairo.Render.Connector

This library contains glue code to interconnect Haskell GI, i.e. the gi-cairo library and gi-cairo-render, i.e. the hand written cairo bindings for Haskell.

Documentation

renderWithContext

Arguments

:: MonadIO m

=> Render a

Render action

-> Context

Context from gi-cairo

-> m a

Result of the action

This function is used to call a function in the Render monad from the draw function of GTK+. It takes a Context (as it appears in gi-cairo) and a Render action (as it appears in gi-cairo-render) and renders the Render context inside the given context.

getContext

Arguments

:: Render Context

Underlying GI.Cairo.Context

This function is used to call back to functions of GI.Pango or GI.PangoCairo or other Haskell GI libraries from inside the Render action. Example:

draw :: Cairo.Render () 
draw = do ...
          context <- getContext
          somePangoFunction context

toRender :: (Context -> IO a) -> Render a

This function is used to "lift" functions of GI.Pango or GI.PangoCairo to the Render monad. Example:

draw :: Cairo.Render () 
draw = do ...
          toRender somePangoFunction