Trying to understand the inner workings of Resizestack

Richard Gaskin ambassador at fourthworld.com
Mon Mar 14 17:59:14 CET 2016


Terence Heaford wrote:
 > I am using the resizeStack message to know that the window has
 > changed size, then I call a routine that redraws a chart. I need
 > to send or dispatch to the group that will contain the chart.
 >
 > How else can I do it?

The simplest and most with-the-grain way to do it is to use the messages 
the engine is already providing.

So rather than write this:

on resizeStack pWidth,pHeight
    myUpdateGeometry
    dispatch "refreshChart" to group "netWorthChart"
    --pass resizeStack
end resizeStack

... you could write this:

on resizeStack pWidth,pHeight
    myUpdateGeometry
    set the rect of grp "netWorthChart" to the rect of me
    --- ...or whatever rect is desired
end resizeStack

The in the "netWorthChart" group you can trap the resizeControl message:

on resizeControl
    refreshChart
end resizeControl

In very old versions of LC (> 4 years old) the resizeControl message was 
only sent to objects when they were resized interactively by the user 
manipulating the selection handles with the pointer tool.

With the advent of custom controls this was changes some time in the v5 
series so that a group can receive the resizeControl message ANY time 
it's resized, whether interactively or via script.

Apparently this powerful change to the resizeControl message hasn't made 
its way into that Dictionary entry yet, so I just filed a report for that:
http://quality.livecode.com/show_bug.cgi?id=17118

-- 
  Richard Gaskin
  Fourth World Systems
  Software Design and Development for the Desktop, Mobile, and the Web
  ____________________________________________________________________
  Ambassador at FourthWorld.com                http://www.FourthWorld.com




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