[RQt-devel] layout issues

[Michael Lawrence]

On Tue, Oct 5, 2010 at 11:49 AM, Hadley Wickham <hadley at rice.edu> wrote:

> Looks good.  Will you add that example to the vignette?
>
>
The vignette has already been updated with the new understanding.


> What do you think about moving the currently intro pdf to the wiki?
>
>
That's fine with me if you know of some clean, automated way of doing it.
Might be tricky keeping it in sync.

Michael


> Hadley
>
> On Tue, Oct 5, 2010 at 1:07 PM, Michael Lawrence
> <lawrence.michael at gene.com> wrote:
> > Looked a bit into the layout issues. I've found that the following script
> > gives a fairly desirable result. Forget about the stretch factor stuff
> for
> > now, because unless a maximum or fixed size is set for a row/column,
> there
> > is no guarantee that the row/column will not expand.
> >
> > library(qtpaint)
> >
> > fill_painter <- function(color) {
> >   function(item, painter) qdrawRect(painter, 0, 0, 1, 1, fill = color)
> > }
> >
> > layout_layer <- function(Color, ...) {
> >   qlayer(figLayer, fill_painter(Color), limits = qrect(0, 0, 1, 1), ...)
> > }
> >
> > scene <- qscene()
> > figLayer <- qlayer(scene)
> > layout <- figLayer$gridLayout()
> >
> > titleLayer <- layout_layer("red", colSpan = 2)
> > yaxisLayer <- layout_layer("blue", row = 1)
> > plotLayer <- layout_layer("green", row = 1, col = 1)
> > xaxisLayer <- layout_layer("yellow", row = 2, col = 1)
> >
> > ## Set the maximum widths/heights:
> >
> > layout$setRowMaximumHeight(0, 50)
> > layout$setColumnMaximumWidth(0, 50)
> > layout$setRowMaximumHeight(2, 50)
> >
> > ## Could use Preferred here, with stretch factor set to zero, but this
> > ## breaks when a layer spans multiple cells. It is hard to say if this
> > ## is a bug in Qt, since QGraphicsGridLayout is largely
> > ## undocumented. QGridLayout says a stretch-zero row/column can grow
> > ## when no other row/column can grow. Setting a fixed or minimum
> > ## width/height probably sets undue restrictions on the layout. The
> > ## user should be able to shrink the window down, even if it is not
> > ## longer possible to draw the data effectively. Thus, it's probably
> > ## best to set the maximum.
> >
> > ## It is probably cleaner to set the dimensions directly on the layer:
> > ## titleLayer$setMaximumHeight(50)
> > ## xaxisLayer$setMaximumHeight(50)
> > ## yaxisLayer$setMaximumWidth(50)
> > ## But this currently crashes due to a (reported) bug in Smoke.
> >
> > qplotView(scene)
> >
> >
> >
> > _______________________________________________
> > Qtinterfaces-devel mailing list
> > Qtinterfaces-devel at lists.r-forge.r-project.org
> >
> https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/qtinterfaces-devel
> >
> >
>
>
>
> --
> Assistant Professor / Dobelman Family Junior Chair
> Department of Statistics / Rice University
> http://had.co.nz/
>
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