Re: layout panel problem, invisible panels

I do not use UiBinder, but I have come across this problem as well, and have found a solution that works for me.

The problem is that HeaderPanel only sets the size of the contentContainer, it does nothing with the contentContainer's child widget (HeaderPanel#getContentWidget()). Aiden's suggestion of using ResizeLayoutPanel as the content widget will not work for the same reason (I tried :P). So, my fix is to always wrap the content widget in a SimpleLayoutPanel that fills the contentContainer:

public class HeaderLayoutPanel extends HeaderPanel implements ProvidesResize{

  @Override
  public void setContentWidget(Widget w){
    SimpleLayoutPanel panel = new SimpleLayoutPanel();
    panel.setSize("100%", "100%");
    panel.setWidget(w);
    super.setContentWidget(panel);
  }
}

setSize("100%", "100%") works because the contentContainer's dimensions are always set in px. Also, remember that this needs to be added to a LayoutPanel for it to fill all available space.

I called this class 'HeaderLayoutPanel' and had it implement the ProvidesResize marker interface because I feel that the SimpleLayoutPanel wrapper makes this a 'true' LayoutPanel, since it does fulfill the onResize() contract for the content widget.

Hope that helps!

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