On Thu, 19 Jun 2008 02:14:18 +0000 (UTC), jverzani <[EMAIL PROTECTED]> wrote:
[...] > The handlers in the various toolkits have several different arguments, > none of course being standard. The ... is to accommodate > these. Whereas, the first argument for a handler, called "h" from the > iWidgets background of gWidgets, is a list containing components "obj" > to refer to the object that the handler is called on, such as the > slider in your example, and "action" which just passes along the > action= argument. (Some widgets have additional components, such as > "dropdata" or "x" and "y".) The h$obj construction allows you to avoid > global variables. So the following are equivalent: > sl = gslider(cont=gwindow(), handler = function(h,...) > print(svalue(sl))) > and > sl = gslider(cont=gwindow(), handler = function(h,...) > print(svalue(h$obj))) Thanks for the explanation! On another note, I got a bit confused the other day trying to learn more about layout from the density example given in the vignette. I was trying to get the following layout:
<<inline: density_layout.png>>
Basically, move the bandwidth slider below the graph and spanning the
whole width of the window. Modifying the layout section of the code as:
---<---------------cut here---------------start-------------->---
window <- gwindow("gWidgetsDensity")
bigGroup <- ggroup(container=window)
vGroup <- ggroup(horizontal=FALSE, container=bigGroup)
hGroup <- ggroup(horizontal=FALSE, container=bigGroup)
tmp <- gframe("Distribution", container=vGroup)
add(tmp, distribution)
tmp <- gframe("Sample size", container=vGroup)
add(tmp,sampleSize)
tmp <- gframe("Kernel", container=vGroup)
add(tmp,kernel)
add(bigGroup, ggraphics())
tmp <- gframe("Bandwidth adjust", container=hGroup)
add(tmp,bandwidthAdjust, expand=TRUE)
---<---------------cut here---------------end---------------->---
Why is the slider still packed side by side, when I'm specifying
'horizontal=FALSE' in hGroup?
I also notice that one needs to do something in a widget to produce the
initial plot, i.e. a default initial the plot is not produced.
Thanks for any further pointers,
--
Seb
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