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Thread: Using GXT 2.x and 3.x Together - sizing probleme

  1. #1
    Sencha User
    Join Date
    Mar 2016

    Default Using GXT 2.x and 3.x Together - sizing probleme

    Hi gxt 3.x developpers,

    I have a GXT2 application and whant to migrate it to GXT3.
    I followed the guide "Using GXT 2.x and 3.x Together" :
    I have a sizing problme when I want to display GXT2 Grid on GXT3 TabPanel.
    The height of the grid is 0 PX.

    On GXT2 interface, my grid is on a ContentPanel which use a FitLayout. I think this component need to know the size of his parent. I think the probleme is here.
    On the migration guide provided by sencha we can read :

    "In cases where a v2 component needs to be sized by a v3 container ... you can use the ThreeComponentWrapper class included in the test project"

    Where can I find this class or download this "test project"?

    Thank's for your help.


  2. #2
    Sencha User
    Join Date
    Mar 2016


    I found a solution to my problem.

    By exploring the BorderLayoutContainer class which was the last gxt3 component before my gxt2 grid, I found the applyLayout method. This method call the ResizeContainer applyLayout.

    On this method we can see that if the widget child is not a GXT3 Component, a specific action is done :

    if (widget instanceof Component) {...} <- gxt3 component
    else {
, height, true);
          if (widget instanceof RequiresResize) {
            Scheduler.get().scheduleDeferred(new ScheduledCommand() {
              public void execute() {
                ((RequiresResize) widget).onResize();
    So I created my wrapper like that :

    import com.extjs.gxt.ui.client.widget.LayoutContainer;
    import com.extjs.gxt.ui.client.widget.layout.FitLayout;
    public class ThreeComponentWrapper extends LayoutContainer implements RequiresResize {
      private LayoutContainer layoutContainer;
      public ThreeComponentWrapper(LayoutContainer layoutContainer) {
        this.layoutContainer = layoutContainer;
        setLayout(new FitLayout());
      public void onResize() {
    We have to note that on ResizeContainer.applyLayout methode, the new size is set to the wrapper object :
    Code:, height, true);
    With the layout(true), my gxt2 wrapper component propagate the resize event.

    I'm not sure it's the best way to do but it solve my problem.

    Do not hesistate to comment!


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