why does DockLayoutPanel care about the order of its elements?

[frische]

Hi,
why does DockLayoutPanel need its Center Element last? Also, why does
GWT Designer allow that? Should I file a bug?

The error thrown if you add an element after the center is:
"
dockLayoutPanel.addEast(stackLayoutPanel, 12.0)

Exception during method invocation evaluation
An exception happened during evaluation of

dockLayoutPanel.addEast(stackLayoutPanel, 12.0)

Method public void
com.google.gwt.user.client.ui.DockLayoutPanel.addEast(com.google.gwt.user.client.ui.Widget,double)
was used with the parameters {<div style="position: relative; "
class="gwt-StackLayoutPanel"><div style="position: absolute; z-index:
-32767; top: -20ex; width: 10em; height: 10ex; ">&nbsp;</div><div
style="position: absolute; overflow-x: hidden; overflow-y: hidden;
"><div class="gwt-HTML gwt-StackLayoutPanelContent" style="position:
absolute; left: 0px; top: 0px; right: 0px; bottom: 0px; ">Empty
StackLayoutPanel.</div></div><div style="position: absolute; overflow-
x: hidden; overflow-y: hidden; "><div class="gwt-HTML gwt-
StackLayoutPanelHeader" style="position: absolute; left: 0px; top:
0px; right: 0px; bottom: 0px; ">Header</div></div></div>,12.0}.
"


GWT 2.3 , gwt designer core 2.3.2.r37x201107161253

[Ivan Pulleyn]

DockLayoutPanel assumes that "center" is all the space that wasn't taken up by a component that was added to the north, east, etc. There's a built in assumption that when you call add() you have finished adding any components that will be docked to an edge.

Ivan...

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[Michael Allan]

Ivan Pulleyn wrote:
> DockLayoutPanel assumes that "center" is all the space that wasn't taken up
> by a component that was added to the north, east, etc. There's a built in
> assumption that when you call add() you have finished adding any components
> that will be docked to an edge.

The "add" methods for the edges (west, north etc.) seem to mix two
concerns that might better be kept separate: 1) specifying the size
constraint for each edge, and 2) adding the edge child. (Maybe that's
a bug in itself.)

As a workaround: first add a panel to each of the edges you need.
This sets the size of the edge. Later you can use the panels to add
and remove the edge children, at any time.

--
Michael Allan

Toronto, +1 416-699-9528
http://zelea.com/

[Eric Clayberg (Google)]

In the latest GWT Designer release, it will ensure that edge widgets are added before the center widget when creating a Java UI.